Abstract: A battery pack includes a secondary battery, a discharge controlling circuit configured to discharge the secondary battery and control an output current supplied to battery driven equipment, a wake-up current detection circuit configured to, in a power saving state in which the output current supplied to the battery driven equipment by the discharge controlling circuit is reduced from a normal non-power saving state, detect that the output current exceeds a wake-up current threshold to make the battery pack transition from the power saving state to the non-power saving state, and a calibration member configured to calibrate a reference point of the wake-up current detection circuit. The wake-up current detection circuit is configured to operate in the power saving state and stop its operation in the non-power saving state, and the calibration member is configured to execute a calibration operation at a predetermined timing in the power saving state.

Abstract: Battery impedance testing devices, circuits, systems, and related methods are disclosed. An impedance measurement device includes a current driver configured to generate an excitation current signal to be applied to a test battery responsive to a control signal, and a processor operably coupled with the current driver. The processor is configured to generate the control signal during an auto-ranging mode and a measuring mode. The auto-ranging mode applies the excitation current signal to the test battery over a plurality of different amplitudes to measure a response to the excitation current signal at each amplitude. The measuring mode applies the excitation current signal to the test battery for an amplitude responsive to the results of the auto-ranging mode. Improved sensitivity and resolution may be achieved for low impedance batteries with a rapid measurement time.

Abstract: The present disclosure relates to a battery module that includes a housing having a first protruding shelf along a first perimeter of the housing, a second protruding shelf along a second perimeter of the housing, where the first and second protruding shelves each include an absorptive material configured to absorb a first laser emission. The battery module also includes an electronics compartment cover configured to be coupled to the housing via a first laser weld, and a cell receptacle region cover configured to be coupled to the housing via a second laser weld. The electronics compartment cover has a first transparent material configured to transmit the first laser emission toward the first protruding shelf and the cell receptacle region cover has a second transparent material configured to transmit the first laser emission or a second laser emission toward the second protruding shelf.

Abstract: A battery cell with a monitoring device including a data processing unit for processing state data of the battery cell as a function of a trigger pulse and a triggering unit, which is connected to the data processing unit, to generate the trigger pulse and to provide the trigger pulse to the data processing unit. The triggering unit is designed to evaluate a measurement signal, which correlates with an electrical energy of the battery cell in order to generate the trigger pulse as a function of the measurement signal. The invention further relates to a battery having such a battery cell as well as to a motor vehicle having such a battery. Furthermore, the invention relates to a method for monitoring at least one such battery cell.

Abstract: Disclosed herein is a battery cell tray for receiving a secondary battery that can be repeatedly charged and discharged. More particularly, there is provided a battery cell tray having a curved battery cell receiving part that is capable of improving dimensional stability of a curved battery cell.

Abstract: An energy management method capable of increasing stability of energy supply is applied to an energy storage device. The energy storage device includes a casing, an energy storage unit, an electronic latching component and a control unit. The energy storage unit is detachably disposed inside the casing. A constraining structure is disposed on an outer surface of the energy storage unit. The electronic latching component is disposed on the casing. The control unit is electrically connected to the energy storage unit and the electronic latching component. The control unit detects storage capacity of the energy storage unit, compares the storage capacity with a threshold, and determines whether to engage the electronic latching component with the constraining structure in accordance with a comparison result, so as to constrain a movement of the energy storage unit relative to the casing.

Abstract: Battery systems that can monitor and control multiple battery cells in electronic devices. One embodiment provides a battery system having multiple battery cells controlled by a single battery controller. Each battery cell is connected to a first end of a control path, a second end of the control path is connected to either a positive terminal or a negative terminal of the battery system. Each control path includes a charge control transistor that allows or prevents charging of a battery cell, a discharge control transistor that allows or prevents discharging of a battery cell, and a current sense resistor to sense currents into or out of a battery cell. The charge control transistor and the discharge control transistor can be controlled by control outputs provided by the battery controller. The battery controller also includes a balance switch to provide a low-impedance path between battery cells to reduce offset voltages between them.

Abstract: The present disclosure relates to a battery pack having improved assemblability, processability, and productivity, and configured to reduce manufacturing costs and enhance the scalability and durability of a pack case. The battery pack includes: a cell assembly including a plurality of secondary cells and a plurality of cartridges, the cartridges being configured to be stacked on one another and to accommodate the secondary cells while surrounding outer circumferential portions of the secondary cells from outsides of the secondary cells; a lower housing having an empty inner space to accommodate the cell assembly in the inner space, the lower housing being opened on an upper side thereof; a lower end plate including a plate-shaped metallic material and placed in surface contact with a lower surface of the lower housing; and a lower cover placed on a lower portion of the lower end plate to cover the lower end plate, the lower cover being fixedly coupled to the lower housing.

Abstract: Disclosed is a battery system for a secondary battery including a blended cathode material, and an apparatus and method for managing a secondary battery having a blended cathode material. The blended cathode material includes at least a first cathode material and a second cathode material. The first and second cathode materials have different operating voltage ranges. When the secondary battery comes to an idle state or a no-load state, the battery system detects a voltage relaxation occurring by the transfer of operating ions between the first and second cathode materials.

Abstract: A snowthrower includes an internal combustion engine and a starter battery pack that provides electrical power to operate an electric starter motor. The starter battery pack is received within a receptacle of the snowthrower and is selectively coupled to the starter motor to initiate operation of the internal combustion engine. The starter battery pack can further include a battery heating circuit that is operable to heat the starter battery pack above ambient temperatures to increase the current output of the starter battery pack. The battery heating circuit includes a controller that utilizes electrical power from the starter battery pack to heat the starter battery pack.

Abstract: An Electric Vehicle Supply Equipment includes a plurality of first power modules and a control circuit. The first power modules are electrically coupled in series at output and configured to provide a charging current and a charging voltage to charge an Electric Vehicle. The control circuit is configured to output a first current control signal to control one of the first power modules to be operated in a constant current mode and output first voltage control signals to control the other first power modules to be operated in a constant voltage mode respectively. The control circuit controls the charging current via the first power module operated in the constant current mode, and controls the first power modules operated in the constant voltage mode have the output voltages corresponding to their first voltage control signals respectively.

Abstract: A charge control device of one example of the present invention comprises a temperature detection unit, a storage unit, and an upper limit setting unit. The storage unit stores a reference current characteristic and at least one of a first current characteristic and a second current characteristic as a charging current characteristic, and stores a reference voltage characteristic and at least one of a first voltage characteristic and a second voltage characteristic as a charging voltage characteristic. The upper limit setting unit selects a characteristic used to set upper limits of a charging current and a charging voltage to the battery from among a plurality of the charging current characteristics and a plurality of the charging voltage characteristics stored in the storage unit.

Abstract: In accordance with an embodiment of a disclosure, a battery pack is disclosed that includes a first battery cell of a first battery type, a second battery cell of a second battery type, a sensor enabled to measure a current and/or a voltage of the first battery cell and/or the second battery cell, a controller enabled to compare a measured current with a current threshold and/or a measured voltage with a voltage threshold, and a switching circuit enabled to connect to the controller one of the first battery cell and the second battery cell, based on a result of the comparison.

Abstract: An apparatus for electrical power supplies and electrical storage systems. While conventional storage systems, for example batteries, offer very limited electrical properties, for example DC voltage with a voltage which is prespecified by the battery design and the state of charge, the apparatus disclosed herein can deliver virtually any desired current and voltage profiles within certain limits, for example a maximum voltage and a maximum current, without the need for a separate power-electronics converter circuit. At the same time, the apparatus can not only output but also receive energy in virtually any desired form and charge its integrated electrical energy stores, for example capacitors, batteries, rechargeable batteries and the like, while maintaining prespecified charging properties, for example specific current and voltage profiles or power output profiles over time (for example constant, increasing with a specific profile or falling with a specific profile).

Abstract: The present technology relates a transformer condition monitoring system including a light source configured to produce an emitted light beam. A plurality of optical sensors are configured to be positioned at a plurality of separate locations on a transformer, receive the light beam from the light source, and generate product light beams from the emitted light beam. A detector is positioned to receive the product light beams from the optical sensors and is configured to measure intensity values of the product light beams for each of the optical sensors. A computing device is coupled to the detector and includes a processor coupled to a memory. The processor executes programmed instructions stored in the memory to determine, based on the measured intensity values for the product light beams for the optical sensors, at least a displacement value, a current value, and a voltage value for the transformer.

Abstract: A method for conducting an operation including a power tool battery pack. The battery pack can include a housing, a first cell supported by the housing and having a voltage, and a second cell supported by the housing and having a voltage. The battery pack also can be connectable to a power tool and be operable to supply power to operate the power tool. The method can include discharging one of the first cell and the second cell until the voltage of the one of the first cell and the second cell is substantially equal to the voltage of the other of the first cell and the second cell.

Abstract: Techniques for a smart battery are described. In at least some implementations, a smart battery includes internal components that enable the smart battery to perform various actions, such as communicating with a remote device, tracking power usage, controlling power output, and so forth. In at least some implementations, a smart battery includes in internal charge circuit that enables the smart battery to be recharged via an externally-supplied charging current without damaging internal components of the smart battery. In at least some implementations, a battery application enables operational parameters of a smart battery to be configured by a remote device.

Abstract: A hybrid distributed low voltage power system can include a first primary power source that distributes line voltage power during a first mode of operation. The system can also include a first secondary power source that receives an input signal during the first mode of operation and distributes a reserve signal during the second mode of operation, where the reserve signal is generated from the input signal. The system can further include a PDM coupled to the first primary power source and the first secondary power source. The system can also include at least one first LV device coupled to the first output channel of the PDM, where the at least one LV device operates using the first LV signal during the first mode of operation, and where the at least one first LV device receives a reserve LV signal during the second mode of operation.

Abstract: Disclosed herein is a battery pack configured to have a structure including a plate-shaped battery cell having electrode terminals formed at one side thereof including a sealed surplus part and a protection circuit module (PCM) mounted at the sealed surplus part, wherein each of the electrode terminals of the battery cell is made of a plate-shaped conductive member, the PCM includes a protection circuit board (PCB), a safety element electrically connected between one of the electrode terminals formed at one side of the battery cell and the PCB or loaded on the PCB, an external input and output terminal electrically connected to a protection circuit of the PCB, and an electrically insulative module case in which the PCB and the safety element are mounted in a state in which the external input and output terminal extends outside, the module case is configured to have a structure in which two outer surfaces of the module case are open outward to form a first open surface and a second open surface, the module cas

Abstract: Aspects of the disclosure relate to graphene-based battery packaging. In one aspect, the graphene-based battery packaging can include an assembly of translucent members, including a thin graphene-based member which can be embodied or can comprise a film of graphene layers, a film of graphene oxide, or a combination thereof. In another aspect, the graphene-based member can be assembled to form an interlayer between two of the translucent members in the assembly. In certain aspects, each of the two translucent members can be embodied in or can include a thermoplastic material. In another aspect, at least one of the translucent members in the assembly can be doped with aggregates that provide a predetermined color to the assembly. In one aspect, the graphene-based member can provide substantive isolation between translucent members separated thereby, thus mitigating diffusion of atoms, molecules, and/or particulates between such members.

Abstract: An electrical storage device according to an embodiment includes a power generator; a first-type capacitor that stores the electrical power generated by the power generator; second-type capacitors that are connected to the first-type capacitor in parallel; switches each of which is connected to one of the second-type capacitors; and a control circuit that controls the switches. Every time either a charging voltage or an observation voltage proportional to the charging voltage exceeds a first threshold value, the control circuit controls the switches in such a way that the i+1-th second-type capacitor (where i is an integer equal to or greater than zero) is additionally connected to the first-type capacitor in parallel.

Abstract: A storage battery system relating to the present invention includes N PCSes. Each of the N PCSes is connected to an individual storage battery module group. The storage battery module group is formed by connecting one or more storage battery modules in parallel. A maximum power storage capacity of the storage battery modules configuring at least one storage battery module group is different from a maximum power storage capacity of the storage battery modules configuring the other storage battery module groups. A controller determines charge/discharge amounts of the individual PCSes on the basis of a charge/discharge request from an EMS, the maximum power storage capacity of the storage battery module, the number of the storage battery modules and a storage battery capacity ratio.

Abstract: A system for dynamic discharging to detected derated battery cells. In such a system, a battery cell capacity, cell voltage, as well as a time to discharge are used in combination to identify good or bad battery cells. More specifically, during a dynamic discharge cycle, an accumulated discharge capacity value is calculated and monitored by a charge level battery gas gauge via analog to digital (A/D) converters and an internal discharge time value is monitored. One of the values is assigned as a fixed value and the other value is used to identify good or bad batter cells.

Abstract: An apparatus for converting an analog signal to a digital signal comprises an input node to be set to an input voltage that is based on the analog signal. The input node is configured to be coupled to a tank capacitor to receive charge from the tank capacitor. The apparatus further comprises a current source configured to be coupled to the tank capacitor to change an amount of charge stored on the tank capacitor. A method for use in operating an analog-to-digital converter to convert an analog signal into a digital signal comprises, in a sensing mode, setting an input voltage based on the analog signal to a sampling capacitor and, in a non-sensing mode, providing a sample voltage to a comparator.

Abstract: Disclosed are an electrode for secondary batteries including an electrode mixture coated on one surface or opposite surface of an electrode current collector, and a method of manufacturing the same. The electrode mixture includes an electrode mixture layer A, which is a portion close to a current collector, and an electrode mixture layer, which is a portion distant from a current collector. The electrode mixture layer A includes a mixture of two active materials, average diameters of which are different, and the electrode mixture layer B includes active materials, average diameters of which are the same.

Abstract: Disclosed is a power device including a connector, a power supply unit, a switch unit, a connector-side voltage detector, a connection determiner, and a switch controller. A battery is detachably connected to the connector. The power supply unit is provided between the connector and external equipment. The switch unit is provided to change over between power supply and power cut-off state unidirectionally from the connector to the power supply unit. The connector-side voltage detector detects a voltage of the connector-side of the switch unit. The connection determiner determines whether the battery is connected to the connector on the basis of the connector-side voltage. The switch controller controls the switch unit such that electric power is supplied unidirectionally from the connector to the power supply unit when the battery is connected.

Abstract: An energy storage system including battery packs having a first terminal electrically connected to a first node and a second terminal electrically connected to a second node and configured to receive power from an external device or configured to provide power to the external device through the first and second nodes and a battery management system controlling the battery packs. Each battery pack includes batteries and a transistor unit electrically coupled between the batteries and the first node. The battery management system includes a measuring unit for measuring a state of charge (SOC) of the batteries of each battery pack, and a controller configured to calculate a high value, a low value, an average value, and a difference value between the high and low values from the measured SOCs, and configured to control the transistor units of the battery packs, based on the calculated high, low, average, and difference values.

Abstract: An overcurrent protection circuit and method for battery discharge. The overcurrent protection circuit includes a discharge switch tube; a discharge control module which is used for detecting the discharge current of batteries in real time, and judging whether an overcurrent is generated by way of comparing the detected discharge current with a preset limiting value, the discharge control module controlling switch-on of the discharge switch tube if no overcurrent is generated, the discharge control module controlling switch-off of the discharge switch tube if an overcurrent is generated, and the discharge control module locking the discharge switch tube in a switch-off state when the overcurrent has timed out; and a time delay module which is used for judging whether the overcurrent has timed out by way of comparing the time when the overcurrent is generated with a preset delay time.

Abstract: Disclosed herein is a battery pack including at least one battery module including a battery cell stack constituted by two or more stacked battery cells that can be charged and discharged and a pack case for surrounding an outside of the battery module, wherein a liquid refrigerant isolated from an inner space of the pack case removes heat conducted from the battery cells through cooling of the pack case.

Abstract: A battery array according to an exemplary aspect of the present disclosure includes, among other things, a circuit connector assembly and a cover that partially covers the circuit connector assembly. The cover includes a groove. A sense-line wire is received within the groove.

Abstract: Establishing secure connections from a computing device to secure servers when the computing device starts with an incorrect system clock time that would ordinarily prohibit connection to the secure servers. A method includes attempting to access a plurality of secure servers. The method further includes, from each of the servers in the plurality of secure servers, receiving one or more certificates from the secure servers and metadata which includes a specification of time. The method further includes preventing secure applications from sending sensitive data to the plurality of secure servers until a system time has been approximated. The method further includes, from the secure specifications of time, approximating a current system time. The method further includes accessing another secure server using the approximated current system time and using the approximated current system time to validate a certificate from the other server.

Abstract: A power adapter, a cable, and a charger, where the power adapter includes an output port, a comparator circuit, and a voltage control and shaping circuit. The output port includes a voltage output terminal, a signal feedback terminal, a first ground terminal, and a second ground terminal. The comparator circuit is electrically connected to the signal feedback terminal, and is configured to compare a reference voltage with a charging input voltage of a to-be-charged device that is fed back by the signal feedback terminal to obtain a comparison voltage and output the comparison voltage to the voltage control and shaping circuit.

Abstract: The invention relates to a battery comprising a plurality of modules arranged in series, characterized in that a module comprises a cell and a cell switch arranged in series with the cell, and in that a circuit for controlling the cell switch is electrically fed directly by at least one cell of a module of the battery.

Abstract: The present disclosure discloses a heat sink with two or more separated channels. The heat sink according to the present disclosure includes a cooling channel through which a refrigerant passes to cool a secondary battery by an indirect cooling method, the secondary battery including a cell assembly in which at least two unit cells are stacked, each unit cell including a positive electrode plate, a separator, and a negative electrode plate, and a plurality of positive and negative electrode tabs protruding from the positive and negative electrode plates of each unit cell is electrically connected to positive and negative leads, respectively, wherein the cooling channel has two or more separated channels, and an insulation material is interposed between at least one of the two or more separated channels and a heat source. According to the present disclosure, provision of a heat sink having a uniform cooling effect is enabled.

Abstract: An information displaying method includes acquiring a battery identifier to identify a battery pack associated with a display device and a device identifier to identify a device to which the battery pack has been mounted, and causing a monitor of the display device to display information indicating that the battery pack corresponding to the acquired battery identifier has been mounted to the device corresponding to the acquired device identifier.

Abstract: A secondary battery according to the present disclosure includes an electrode assembly, a first lead plate connected to the electrode assembly, a second lead plate disposed facing the first lead plate with a gap therebetween such that at least a portion of the second lead plate overlaps with at least a portion of the first lead plate, a metal bridge disposed within the gap to connect the first lead plate and the second lead plate, a first sealant disposed within the gap further outside than the metal bridge, a pouch case to receive the electrode assembly such that the second lead plate is drawn outside, and a second sealant interposed respectively between an inner surface of the pouch case and the first lead plate and between the inner surface of the pouch case and the second lead plate.

Abstract: A multi-cell battery system is disclosed including a plurality of battery sub-assemblies and a plurality of heat exchange members stacked together along a longitudinal axis. Each of the plurality of heat exchange members defines a heat exchange passageway through the battery system.

Abstract: A device for servicing/maintaining a high-voltage battery, which has individual battery cells or battery modules, and high-voltage positive and negative terminals, and a battery management system having a data transmission terminal for bidirectionally transmitting management system data between the management system and an information-processing unit, external to the battery. The device includes at least two of: a battery charge device, a battery discharge device, and a battery diagnostic device. A battery charge device brings a battery to a higher charge state, and has positive and negative terminals to be connected to positive and negative battery terminals. A battery diagnostic device checks a battery, and the device, for the presence of internal errors, and to indicate recognized internal errors, and may also produce diagnostic data for the battery state and triggering functions directed to bring the device and/or battery safely into a different state, to operate/test them.

Abstract: A method and system for charging multi-cell lithium-based batteries. In some aspects, a battery charger includes a housing, at least one terminal to electrically connect to a battery pack supported by the housing, and a controller operable to provide a charging current to the battery pack through the at least one terminal. The battery pack includes a plurality of lithium-based battery cells, with each battery cell of the plurality of battery cells having an individual state of charge. The controller is operable to control the charging current being supplied to the battery pack at least in part based on the individual state of charge of at least one battery cell.

Abstract: The invention relates to wireless energy transfer systems wherein electromagnetic field is used to transfer energy over air. An apparatus of a wireless energy transfer system comprises an inductive energy transfer coil (43) comprising at least two adjacent wire turns, wherein said turns are arranged to be coupled to a battery (41) such that said turns vertically surround the battery (41) during inductive energy transfer. The invention further relates to a method for producing the apparatus and an electronic device comprising the apparatus.

Abstract: Embodiments of the invention relate to a multi-cell battery, with at least two cells electrically connected in a first parallel arrangement, which is connected in series to a second parallel arrangement of at least two additional cells. Each cell is locally connected to a sensor to sense and control current of each cell in parallel or parallel-series combination in the multi-cell battery. A control module is in communication with each sensor, and associated instructions electrically remove or disable a cell from the multi-cell battery determined to be defective based on measurements from the associated sensor. A configuration performs measurements and monitors a state of health of each cell in the multi-cell battery, the measurements including temperature, voltage and current sensing. Identifying one cell of the cells in the multi-cell battery as subject to a performance failure results in electrically switching the identified cell to an off position.

Abstract: A vehicle battery mounting structure includes a battery frame that is disposed at a vehicle lower side of a floor panel, and is made from resin; a ductile member that includes a main body joined to the battery frame and a flange contiguously formed at a vehicle width direction outside end of the main body, the flange having a hole, and the ductile member being fastened to a lower face of the floor panel using a fastener inserted through the hole; and a fastening portion that is formed in a region including the hole, having a substantially hat shaped cross-section profile projecting toward a vehicle upper side and having ridge lines on vehicle front-rear direction sides of the region, and the ridge lines being formed with curved or bent shape toward directions heading away from the hole on progression toward a vehicle width direction inside in plan view.

Abstract: A measurement fixture for a battery cell is provided when the battery cell is connected to an apparatus. The measurement fixture comprises a chamber, a pressure sensor and an expansion sensor. The chamber defines a sealed space for receiving the battery cell. The pressure sensor is mounted to the chamber to sense a change of pressure in the sealed space due to a volume change of the battery cell to calculate pressure in the battery cell and the volume change of the battery cell non-contactly. The expansion sensor is mounted to the chamber to sense a deformation of the battery cell to calculate a correlation between the pressure in the battery cell and the volume change of the battery cell non-contactly.

Abstract: A method for conducting an operation including a power tool battery pack. The battery pack can include a housing, a first cell supported by the housing and having a voltage, and a second cell supported by the housing and having a voltage. The battery pack also can be connectable to a power tool and be operable to supply power to operate the power tool. The method can include discharging one of the first cell and the second cell until the voltage of the one of the first cell and the second cell is substantially equal to the voltage of the other of the first cell and the second cell.

Abstract: Disclosed herein is a battery cell case. The battery cell case includes a front case plate and a rear case plate which are separably coupled to each other. The structures of the front and rear case plates are symmetrical structures, so that the battery cell case can be easily assembled in such a way that the front and rear case plates are coupled to each other with the battery cell disposed therebetween and are fastened to each other by holders fitted over the opposite ends of the case plates. In another embodiment, the structures of the front and rear case plates may be asymmetrical structures so that the front and rear case plates can be coupled with each other in an insert coupling manner without using a separate tool or fastening means.

Abstract: A battery box for a wearable computing device is disclosed. The battery box is comprised of a cover, battery, a structural housing sized to hold the battery, and a polymer rim. The battery box is enveloped in a thermoplastic elastomer molecularly bonded to the polymer rim. The polymer rim, thermoplastic elastomer, and cover of the battery box cooperatively resist fluid ingress into the battery box.

Abstract: Sneaking of a charging current to a load is avoided, a voltage of a battery is not output to terminals of a connector, and the number of installed switch elements that make conductive or interrupt a feeding path is minimized. A battery pack including a battery that supplies power to a load and to which power is supplied from a charger includes: a relay connector including a first terminal, a second terminal, and a third terminal; a first feeder that connects the load to the first terminal of the relay connector; a second feeder that connects one electrode terminal of the battery to the second terminal of the relay connector; a third feeder for which one terminal is connected to the third terminal of the relay connector; and a switch element that is connected between the other terminal of the third feeder, and the other electrode terminal of the battery.

Abstract: Method for start-up of a field device, wherein for start-up of the field device an energy storage unit (R) for storing electrical energy is charged by means of a power supply (PS), preferably a power-limited power supply (PS), and wherein the electrical energy stored in the energy storage unit (R) is used to supply the field device at least at times with electrical energy, at least during start-up of the field device.

Abstract: A electricity storage module is provided with a stack formed by stacking a plurality of electricity storage elements having positive and negative lead terminals that protrude outward from end portions thereof and insulating holder members made of an insulating material for holding the electricity storage elements. A connecting portion formed by connecting different polarized lead terminals of adjacent electric cells is disposed in a position shifted from other connecting portions than that connecting portion as seen from the stacking direction of the stack, and the insulating holder members are provided with windows that correspond to the connecting portions.

Abstract: An energy storage system and a starting method thereof are disclosed. In one aspect, the energy storage system includes a battery system, a direct current (DC) contactor and a power supply. The battery system includes at least one battery rack, wherein the battery rack is configured to provide first power. The DC contactor electrically connects a current path between the battery system and a power conversion system. The power supply is electrically connected to the DC contactor. In the energy storage system, the DC contactor is configured to be turned on based on at least the first power.