Abstract: A power distribution system comprises a plurality of energy storage modules coupled in series. A plurality of electrically isolated power converters are each coupled across one or more of the energy storage modules. When enabled, the power converters provide a low voltage output to an output of the power distribution system. A control system controls the power converters to provide the low voltage output. The control system selectively enables the power converters to balance states of charge of the energy storage modules.

Abstract: According to one embodiment, a battery includes: a first wire; a second wire; a third wire; a first resistor; a first switch; a second switch; a second resistor; a voltage measurer; and a controller that calculates a second resistance value of the third wire using a first voltage of a first battery when the first switch is turned on and the second switch is turned off, a second voltage of a second battery when the first switch is turned on and the second switch is turned off, a third voltage of the second battery when the first switch is turned off and the second switch is turned off, and a first resistance value of the first resistor.

Abstract: The present application relates to an active equalization method and system of a lithium iron phosphate (LFP) battery pack.

Abstract: The invention relates to a battery management system for a battery having a plurality of battery cells connected in series, comprising a battery control unit, a plurality of low-voltage measuring devices, by means of which the voltage of one or more battery cells can be measured, and comprising one or more high-voltage measuring devices for a voltage across a plurality or all the battery cells, and/or at least one current measuring device, by means of which a current from or through the battery can be measured, and/or at least one a measuring module comprising a high-voltage measuring device, and a current measuring device, characterized by a signal transmission device, by way of which signals from low-voltage measuring devices and from at least one of the high-voltage measuring devices and/or the current measuring device and/or the measuring module can be transmitted to the battery control unit.

Abstract: The present invention includes self-contained, rechargeable power systems for areas having unreliable electrical grids or no electrical grid at all, and methods related thereto. The system may include one or more solar panels of various sizes to provide an off-grid power generation source, battery receivers for receiving batteries of various chemistries, and a control circuitry that is operable to detect the voltage and/or current output of the batteries that are installed in the system to determine their specific battery chemistry and then adjust the charge algorithm of the batteries to optimize both the charge capacity and the cycle life of the batteries. The control circuitry may also be operable to switch configurations of the solar panels and/or the batteries to optimize performance of the system. The system may be operable to power one or more light emitters and/or external electronic devices connected through the system by a charge port.

Abstract: There is provided a power storage device including a plurality of modules each including secondary batteries, a charging switch that controls charging to the secondary batteries, a discharging switch that controls discharging of the secondary batteries, and a voltage measuring unit that measures a voltage of the module, and a switch control unit that controls one or both of the charging switch and the discharging switch. The modules are connected in parallel. The switch control unit maintains an on state of the discharging switch for at least one of the modules for a predetermined period, and controls the charging switch of the module in which a maximum module charging current estimated based on the voltage of the module is a predetermined value or less, to be in an on state.

Abstract: A battery pack includes a plurality of electrically connected battery modules. The battery module includes a plurality of type-A battery cells and a plurality of type-B battery cells. The type-A battery cells and the type-B battery cells are arranged in alternate manner. Both of the type-A and the type-B battery cells have a positive tab and a negative tab. The positive tabs and negative tabs of all type-A battery cells are electrically connected with a type-A first and a type-A second connecting pieces respectively. The positive tabs and negative tabs of all type-B battery cells are electrically connected with a type-B first and a type-B second connecting pieces respectively. When the battery pack burns, the type-A battery cells have an isolation effect on stopping the diffusion of combustion so as to improve the safety, and also improve the rapid charging and discharging ability and energy density of the battery pack.

Abstract: A wireless earbud includes a housing having a stem portion coupled to an ear portion. The stem portion has an electrical connector disposed on a distal end that includes first and second electrical contacts coupled to receive power for recharging a battery within the wireless earbuds.

Abstract: Each of a plurality of monitoring units (10) that monitor the states of batteries allocates, as identifying information for itself, identifying information corresponding to an input signal inputted from a preceding control unit (3) or monitoring unit (10); outputs, to a subsequent monitoring unit (10), a signal that differs from the input signal corresponding to the identifying information the monitoring unit (10) in question has allocated to itself; and, if and when identifying information corresponding to an input signal differs from the identifying information the monitoring unit (10) in question had allocated to itself, reallocates identifying information corresponding to said input signal as identifying information for itself.

Abstract: A power storage system includes: a first storage battery that is configured to be supplied with power generated by a power generation element performing environmental power generation and to supply power to an external load apparatus; a second storage battery that is configured to have a capacity larger than a capacity of the first storage battery, and to supply power to the external load apparatus; a first switch unit that performs switching between an electrical connection state and disconnection state between the first storage battery and the second storage battery; and a first changeover unit that compares a voltage of the first storage battery with a first threshold voltage which is equal to or higher than a voltage causing the external load apparatus to be operated, and controls the first switch unit according to a comparison result.

Abstract: The invention provides a coil apparatus (100) for inductive power transmission, comprising an electromagnetic coil (102) for emitting and/or picking up an electromagnetic field (112) on a transmission side (106) of the coil apparatus (100), and comprising a housing wall (104), which covers the coil (102) on the transmission side (106) and is transmissive to the electromagnetic field (112). Furthermore, the coil apparatus (100) comprises a housing medium (108), which is enclosed by the housing wall (104) in such a way that, when a through-opening (110) is formed in the housing wall (104), the housing medium (108) passes through the through-opening (110). Alternatively, a housing vacuum is provided which is enclosed by the housing wall in such a way that, when a through-opening is formed in the housing wall, atmospheric air (118) passes through the through-opening. Among further aspects, a vehicle comprising such a coil apparatus and a method for inductive power transmission are provided.

Abstract: The present disclosure provides a system, method, and apparatus for battery management. The disclosed method involves current balancing through sinking and/or sourcing current, by at least one virtual cell, for battery cells in a battery pack based on available current and capacity of the battery cells. In one or more embodiments, at least one virtual cell is capable to sink and/or source current for at least one degraded battery cell or at least one dead battery cell.

Abstract: A shovel includes an electrical power storage device that may be made of a plurality of electrical power storage cells for charging electricity generated by a generator; and an electrical power storage administration part that includes equalizing circuits each of which may be connected to corresponding one of the plurality of electrical power storage cells, an equalizing circuit defect determination part which determines whether a defect exists in the equalizing circuit, and a shutoff part which shuts off a connection between the equalizing circuit in which the defect may be determined to exist and the electrical power storage cell connected to the equalizing circuit.

Abstract: The present invention has an object to provide a battery control system which can immediately notify an abnormality to a battery system controller when a battery abnormality occurs. The battery control system according to the invention includes a first communication unit which transmits battery data using a first radio frequency and a second communication unit which transmits abnormality data using a second radio frequency. The first communication unit transmits the battery data at a predetermined period. The second communication unit transmits the abnormality data when the battery abnormality is detected.

Abstract: A control circuit for stopping a booster circuit and an electronic apparatus using the control circuit are described. The electronic apparatus includes a control circuit, a booster circuit and an electronic device. The control circuit is electrically coupled to the booster circuit and the battery. The booster circuit is electrically coupled to the battery and the electronic device. The booster circuit is used to boost the battery voltage, to generate an output voltage for operation of the electronic device and the control circuit. The control circuit may stop the operation of the booster circuit when the battery voltage is not higher than the first voltage, and when a number of occurrences in which the battery voltage falls below the first voltage reaches a predetermined number, or the output voltage does not reach a second voltage within a predetermined time interval.

Abstract: Battery controller chooses as a standard storage battery Bs one of the storage batteries which has the lowest voltage in storage batteries B1 to Bn. Battery controller obtains as a standard voltage Vs a voltage of the standard storage battery Bs, and obtains as a standard SOHs an SOH of the standard storage battery Bs. Battery controller specifies from storage batteries B1 to Bn a storage battery to be discharged by equalizing unit 450 based on a magnitude relation between an SOHj of each of the storage batteries and the standard SOHs and based on a voltage difference between the terminal voltage of each of the storage batteries and the standard voltage Vs. Battery controller performs an equalizing process by causing equalizing unit to discharge the specified storage battery.

Abstract: A smart, integrated charging device for electric vehicles is provided. The alternating current input module is connected to an electricity metering module via an alternating current input switch. The charging module is connected to the electricity metering module via a module alternating current switch and an alternating current bus, and is connected to an output monitoring module via a direct current bus. The output monitoring module is connected to the monitoring and general control module (13). The direct current output module is connected to the output monitoring module (4) via a direct current output switch. The lightning protection module is connected to the direct current bus. The charging module utilizes smart power combination and multiple output coordination to enable output with current sharing and the automatic balance control technology.

Abstract: Disclosed is a battery management unit for setting a communication identifier through the frequency of a start signal. The battery management unit according to the present invention analyzes the frequency of a received start signal. If the frequency of the start signal is a fundamental frequency, the battery management unit sets itself as a master unit. If the frequency of the start signal is not the fundamental frequency, the battery management unit sets itself as a slave unit. In addition, when outputting a start signal to another neighboring battery management unit, the battery management unit according to the present invention outputs the start signal by modulating the frequency of the start signal into a frequency produced by adding an additional frequency value to the frequency as received in the battery management unit.

Abstract: Disclosed a voltage-deviation detecting and adjusting system for a balance module of a battery.

Abstract: A reference voltage value is calculated by using a current value, a voltage value, and an internal resistance value of an electric storage apparatus. A dischargeable electric power is calculated by using the reference voltage value and a predetermined internal resistance value previously set to be higher than the internal resistance value. The dischargeable electric power is set as an allowable discharge electric power when temporarily increasing the discharge electric power required of the electric storage apparatus. The reference voltage value is calculated from the internal resistance value and is a fixed value regardless of the relationship between the current value and the voltage value. The dischargeable electric power is also constant. Since the predetermined internal resistance value is higher than the internal resistance value, the dischargeable electric power can be set while the deterioration of the electric storage apparatus is taken into account.

Abstract: A battery monitor circuit includes a first monitoring unit for detecting voltages of battery cells in a first group, a second monitoring unit for detecting voltages of battery cells in a second group, and a current cancellation unit for canceling a difference between first and second currents that flow through the first and second monitoring units, respectively. One terminal of a series connection of the battery cells in the first and second groups and one terminal of the first monitoring unit are connected, the other terminal of the first monitoring unit and one terminal of the second monitoring unit are connected, and the other terminal of the second monitoring unit and the other terminal of the series connection are connected. The current cancellation unit is disposed between a connection point between the first and second monitoring units and a middle connection point in the middle of the series connection.

Abstract: A system includes a first circuit in which storage battery units are connected in series, second circuits, adjusters that adjust the amounts of the currents flowing through the second circuits, and a controller that performs at least one of first control and second control. The first control is control in which the controller causes the adjusters to make the voltage of a first storage battery unit higher than the voltage of a second storage battery unit having a higher degree of degradation than the first storage battery unit by adjusting the amounts of the currents flowing through the second circuits and then stops a charge. The second control is control in which the controller causes the adjusters to make the voltage of the first storage battery unit lower than the voltage of the second storage battery unit by adjusting the amounts of the currents flowing through the second circuits and then stops a discharge.

Abstract: A secondary battery module includes a plurality of secondary battery units each including at least one secondary battery, each secondary battery including an electrode assembly, a case accommodating the electrode assembly, and first and second electrode terminals electrically connected to the electrode assembly, wherein for at least the first secondary battery unit of the plurality of secondary battery units, each of the corresponding at least one secondary batteries further includes a short-circuit member electrically connected to the corresponding first electrode terminal and protruding to the outside of the case upon the internal pressure of the case reaching a high-pressure condition; at least one fuse connecting at least two of the plurality of secondary battery units to one another in series; and a short circuit connection member having a first side facing each of the short-circuit members of the at least one secondary battery of the first of the plurality of secondary battery units and a second side el

Abstract: In a method for monitoring a battery which includes a number of cells, in each instance, at least one electronic unit is situated so as to be in contact with at least two of the cells, in order to record a variable of this cell and forward it to a central receiver.

Abstract: A heating system includes: an alkaline secondary battery and a controller. The alkaline secondary battery includes: a power generating element configured to be charged or discharged; and a battery case that accommodates the power generating element in a hermetically sealed state. The controller is configured to control charging and discharging of the alkaline secondary battery, and, when an internal pressure of the alkaline secondary battery is higher than or equal to a first threshold, execute a heating process for heating the alkaline secondary battery by decreasing the internal pressure through discharging of the alkaline secondary battery. The heating process is a process of raising a temperature of the alkaline secondary battery.

Abstract: A battery balancing apparatus configured to perform a battery balancing for a battery pack is provided. The battery balancing apparatus includes n energy storage elements connected in series, n resistors connected in series and a switch unit. First and second terminals of an ith resistor among the n resistors are connected to first and second terminals of an ith energy storage element respectively, where n and i are positive integers and 1?i?n. In a first period, the switch unit selects at least one ith battery unit from among the battery units, and connects positive and negative electrode terminals of the ith battery unit to the first and second terminals of the ith energy storage element respectively, so as to perform the battery balancing. A battery balancing method is also provided.

Abstract: The invention relates to chargers of lithium-ion batteries. The system contains a common control block and control blocks of each of the multitude of battery cells, where each cell of the multitude of cells is controlled by its own control block, which contains a micro-controller that has the capabilities to receive data about the condition of the cell, transfer the received information to the block of common control, and balance voltages of cells by high currents, where the balancing mode efficiently operates in any mode of the battery operation, where the multitude of cells of the accumulator batter are connected in series by direct current, and in parallel by alternating current through the system of DC/AC converter balancing, where the converters are synchronized by the common control signal from the common control block. The invention reduces the charging time and increases the discharging time of the battery.

Abstract: Systems and methods for allocating electrical current among battery sets connected in a substantially parallel configuration. A respective state of health is determined for each respective battery set in a plurality of battery sets. The respective state of health reflects a respective present amount of total energy able to be stored by each respective battery set relative to a specification of the respective battery set. A respective allocation of electrical current for each battery set in the plurality of battery sets is determined based on the respective state of health for each respective battery set. A current flow through each respective battery set is configured to its respective allocation of electrical current based on determining the respective allocation.

Abstract: According to one embodiment, a system includes an electronic device and an extension device. The electronic device includes a first connector to which a first AC adapter is connected, a first control IC including a first power supply controller, and a first charger IC to charge a first battery with power from the first AC adapter in response to an instruction from the first power supply controller. The extension device includes a second connector to which a second AC adapter is connected, a second control IC including a second power supply controller, and a second charger IC to charge a second battery with power from the second AC adapter in response to an instruction from the second power supply controller.

Abstract: A battery system includes multiple battery cells having multiple cell voltages, and a balancing module. The battery module coupled to multiple battery cells and configured to specify a first voltage threshold according to an amount of a charging current supplied to the battery cells in constant current charging mode, and to initiate a balance check of the battery cells if the first voltage threshold is not satisfied by a cell voltage of the plurality of cell voltages.

Abstract: A battery monitor system is provided for plural battery groups. The battery monitor system includes plural monitor modules for monitoring battery voltages of the battery groups and provided with a non-volatile memory for storing monitor data, which includes voltages of the monitor battery, and a monitor controller for communicating with the monitor modules and transmitting command signals to the monitor modules thereby to store the monitor data in the non-volatile memory. The monitor controller causes the non-volatile memory to store the monitor data therein, when communication with the monitor controller is disabled for a predetermined threshold period.

Abstract: A control subsystem configured to control transferring of power, including: an AC/DC power supply; an uninterruptable power supply; a processor; an Ethernet switch; a first communication interface configured to send and/or receive data from a battery management unit that monitors a storage subsystem including one or more batteries; a first transfer interface configured to transmit power to the storage subsystem; a second communication interface configured to send and/or receive data from a power subsystem that includes a power converter, and the power subsystem is configured to be connected to a power line; and a second transfer interface configured to transmit power to the power subsystem, wherein the processor is configured to send signals which control the charging and discharging of at least one battery of the one or more batteries in the storage subsystem.

Abstract: A cell monitoring apparatus includes a processor and memory arranged to execute code representing a linear time-invariant state transition model and a non-linear observation model are provided to model a rechargeable cell using at least a non-linear open circuit voltage, an internal resistance, a time-invariant distortion voltage across a reactive component block, and a distortion current component constituting an error of measurement of current flowing through the reactive component block. An estimator unit performs extended Kalman filtering in respect of the state transition model and the observation model using the input state data in order to generate output state data. The processor is arranged to evaluate a criterion associated with at least part of the output state data and to generate a control signal in response to evaluation of the criterion.

Abstract: An electrical distribution system includes a first energy store and a second energy store. The two energy stores are connected in parallel. Characteristic values of the first and/or second energy store are detected and a regeneration phase of the first energy store is implemented depending on the detected characteristic values. In the regeneration phase, a first operating voltage is preset and provided by means of a generator in such a way that said first operating voltage contributes to the second energy store having, after a preset time span, a higher open-circuit voltage than the first energy store.

Abstract: The present invention relates to a method for connecting multiple battery cells (21) of a battery (11), wherein the multiple battery cells (21) can be connected in series to one another, and a single first control variable P1 and a single second control variable P2 are predefined for all the battery cells (21). In this context, in order to generate a desired output voltage of the battery (11), each battery cell (21) is electrically coupled to the battery (11) with a corresponding first probability, defined as a function of the first control variable P1, and in each case electrically decoupled from the battery (11) with a corresponding second probability, defined as a function of the second control variable P2. In addition, a value of the first control variable P1 and a value of the second control variable P2 are respectively predefined repeatedly with an update frequency which is dependent on the desired output voltage of the battery (11) which is to be generated.

Abstract: A rechargeable battery that may be manufactured and used in various shapes is disclosed. An embodiment of the rechargeable battery includes: an electrode assembly including a pair of electrodes on respective surfaces of a separator and a pair of lead tabs extending from the pair of electrodes; and a pouch receiving the electrode assembly and having the lead tabs protruding out to one side, each of the electrodes including a first bending part including a molded plate including active material particles and a metal fiber yarn of a current collector, and the pouch including a second bending part superimposed on the electrodes in parallel and including a molded sheet having a shape corresponding to that of the first bending part.

Abstract: There is provided a voltage monitoring apparatus for monitoring an output voltage of an assembled battery. The voltage monitoring apparatus comprises: voltage monitoring sections, each section monitoring a voltage of each block of the plurality of blocks into which the plurality of unit cells are divided, wherein the voltage monitoring sections are connected one another through communication lines; and a control unit which is connected to the voltage monitoring section through the communication lines. The voltage monitoring section compares the respective detected voltages of the unit cells with the threshold voltage to determine a result of the comparison, and transmits the comparison result to the control unit. In a case where the threshold voltage is changed, the control unit transmits a registration signal indicating the changed threshold voltage, and when received the registration signal, the voltage monitoring section changes the stored threshold voltage to the changed threshold voltage.

Abstract: A semiconductor device includes a first electrical current source connected to an assembled battery through a power source terminal; and a second electrical current source connected to an input terminal to which an external electrical current is input. The first electrical current source is configured to generate a first electrical current according to a reference voltage based on a power source electrical current input into the power source terminal, and to output the first electrical current to an output terminal. The second electrical current source is configured to generate a second electrical current according to the reference voltage based on the external electrical current, and to output the second electrical current to the output terminal.

Abstract: A power reserve apparatus is disclosed. In one embodiment, the power reserve apparatus comprises a first module including a first set of battery cells and a first inter-cell balance adjustment unit configured to use passive balancing to reduce voltage variance among the first set of battery cells. The power reserve apparatus also comprises a second module including a second set of battery cells and a second inter-cell balance adjustment unit configured to use passive balancing to reduce voltage variance among the second set of battery cells. The power reserve apparatus further comprises an inter-module balance adjustment unit configured to use active balancing to reduce voltage variance among the first and second modules.

Abstract: Embodiments disclosed herein relate to a battery energy storage system (BESS) that can be used to store energy that is produced by conventional sources (e.g., coal, gas, nuclear) as well as renewable sources (e.g., wind, solar), and provide the stored energy on-demand.

Abstract: An abnormality detection circuit detects an abnormality in a power storage device. A positive electrode terminal and a negative electrode terminal respectively receive a positive electrical potential and a negative electrical potential from a converter. A power storage module includes plural cells connected in series between the positive electrode terminal and the negative electrode terminal. The abnormality detection circuit includes a voltage detection circuit and a control circuit. The voltage detection circuit detects an electrical potential of an intermediate node located at an intermediate position between the positive electrode terminal and the negative electrode terminal on a basis of a ground potential. The control circuit determines an abnormality of the power storage module based on a change in an intermediate ground potential from voltage detection circuit from the ground potential.

Abstract: A voltage equalization apparatus includes a switch controller controlling a first switch that is configured to provide a first voltage to a first rectifier element group corresponding to a first electricity storage member and controlling a second switch that is configured to provide a second voltage to a second rectifier element group corresponding to a second electricity storage member, and the switch controller is configured to individually control the first switch and the second switch based on voltage measurement signals of the first electricity storage member and the second electricity storage member.

Abstract: An implantable medical device includes a low-power circuit and a multi-cell power source. The cells of the power source are coupled in a parallel configuration. The implantable medical device includes both a low power circuit that is selectively coupled between the first and second cells and a high power output circuit that is directly coupled to the first and second cells in a parallel configuration. An isolation circuit is coupled to the first cell, the second cell and the low power circuit to maintain a current isolation between the first cell and the second cell at least during delivery of current having a large magnitude to the high power output circuit.

Abstract: Apparatuses and methods for removing a defective energy storage cell from an energy storage array is described. An apparatus includes an energy storage array including a plurality of energy storage cells, and a cell removal circuit coupled to the energy storage array. The cell removal circuit is configured to prevent a defective energy storage cell of the plurality of energy storage cells from causing other energy storage cells of the plurality of energy storage cells to become defective. A method includes receiving power at a charging node of an energy storage array, the energy storage array including a plurality of energy storage cells. Responsive to failure of an energy storage cell of the plurality of energy storage cells, current is provided through the defective energy storage cell, and responsive to the defective energy storage cell becoming an open circuit, discontinuing provision of the current through the defective energy storage cell.

Abstract: A battery warm up system according to the present disclosure includes an open signal receiving unit to receive a door open signal for opening a door of a vehicle, a temperature measuring unit to measure a temperature of a battery pack connected to a starter of the vehicle, a control unit to output a forced discharging start signal by referring to information associated with the temperature measured by the temperature measuring unit when the door open signal is received by the open signal receiving unit, and a forced discharging circuit unit to force a plurality of battery modules constituting the battery pack to be discharged in response to the forced discharging start signal.

Abstract: Embodiments of the present invention disclose a circuit structure and a method for reducing power consumption of a device including an active module and a passive module. The circuit structure comprises: an active module (22) comprising a main output voltage (221) for powering a load (26) via a first current control device (222) which is configured to control a current passing through the load (26), and an passive module (24) comprising a main output voltage (241) for when the active module (22) fails, powering the load (26) via a second current control device (242) which is configured to control a current passing through the load (26). The passive module (24) further comprises an auxiliary output voltage (243) for when the passive module (24) is in a backup state, powering the second current control device (242) so as to enable the second current control device (242) to be in a switching-on state.

Abstract: A system and method are disclosed for diagnosing an open circuit of a cell voltage sensing board. The board includes, for each cell, a line balancing resistor, a line sense resistor, and a gate. Each gate connects and disconnects a given line balancing resistor to and from a corresponding cell. A cell voltage is measured for a selected battery cell, and a controller determines if the selected battery cell is an uppermost or lowermost cell in the battery stack. A line sense resistance value is calculated for the selected battery cell using a first set of equations when the selected battery cell is the uppermost cell, a second set of equations when the selected battery cell is the lowermost cell, and a third set of equations when the selected battery cell is neither. A control action is executed when the calculated line sense resistance exceeds a calibrated resistance threshold.

Abstract: A current flow controller (10) comprising: a plurality of terminals (12a, 12b, 14a, 14b) for connection, in use, to a plurality of DC power transmission medium (16,18) such that each DC power transmission medium (16,18) is connected to at least one of the plurality of terminals (12a, 12b, 14a, 14b); and a current flow control unit interconnecting the plurality of terminals (12a, 12b, 14a, 14b), the current flow control unit including a plurality of current flow control sub-units (20, 22, 23) each of which is, in use, connected to a respective DC power transmission medium (16, 18), each current flow control sub-unit (20, 22, 23) including at least one switching element (24, 28), the or each switching element (24, 28) of each current flow control sub-unit (20, 22, 23) being connected to the same energy storage device (26; 56) to selectively provide a voltage source, and a switching control unit (100) to control switching of each switching element (24, 28) of the current flow control unit to selectively inject a

Abstract: Power management and power transfer systems within the transmit and receive portions of an inductive charging system. An inductive charging system may include an inductive charging station to transmit power and a portable electronic device to receive power. Embodiments may take the form of power transfer systems within an inductive charging station including load-based transmit frequency adjustments. Embodiments may also take the form of power management systems within portable electronic devices which conserve power by disconnecting circuits from ground when those circuits are in an idle state.

Abstract: An object is to inhibit a decrease in the capacity of a power storage device or to compensate the capacity, by adjusting or rectifying an imbalance between a positive electrode and a negative electrode, which is caused by decomposition of an electrolyte solution at the negative electrode. Provided is a charging method of a power storage device including a positive electrode using an active material that exhibits two-phase reaction, a negative electrode, and an electrolyte solution. The method includes the steps of, after constant current charging, performing constant voltage charging with a voltage that does not cause decomposition of the electrolyte solution until a charging current becomes lower than or equal to a lower current value limit; and after the constant voltage charging, performing additional charging with a voltage that causes decomposition of the electrolyte solution until a resistance of the power storage device reaches a predetermined resistance.