Abstract: A battery system includes a battery circuit group in which a plurality of battery circuits, each including a plurality of battery units including a battery and a switching unit connected in series, are connected in parallel, and a control unit that controls the switching unit. The switching unit switches a state of the battery unit between a first state, in which the battery is connected between a positive electrode end and a negative electrode end of the battery unit, and a second state, in which the positive electrode end and the negative electrode end are connected without the battery. When discharging, the control unit controls the switching unit such that the state of the battery unit including the battery determined to be not fully discharged becomes the first state, and the state of the battery unit including the battery determined to be fully discharged becomes the second state.

Abstract: A battery pack is provided which enables a reduction of a load on the electrodes which occurs with expansion or contraction of the batteries. Multiple batteries have electrode tabs protruding from both ends, and are stacked in a stacking direction orthogonal to a protrusion direction of the electrode tabs. Busbar modules are jointed to the electrode tabs and comprise busbars for connecting the batteries. An aluminum plate is arranged between batteries of the multiple batteries which are adjacent to a center. This aluminum plate and the busbar modules are fixed.

Abstract: A voltage conversion device includes first and second converters. The first converter boosts an input voltage equal to or higher than a reference voltage (high regenerative voltage) to a first voltage more efficiently than the second converter boosting the input voltage equal to or higher than the reference voltage (high regenerative voltage) to the first voltage. The second converter boosts an input voltage lower than the reference voltage (low regenerative voltage) to a second voltage more efficiently than the first converter boosting the input voltage lower than the reference voltage (low regenerative voltage) to the second voltage. The voltage conversion device causes the first converter to boost the input voltage when the input voltage is equal to or higher than the reference voltage, and causes the second converter to boost the input voltage when the input voltage is lower than the reference voltage.

Abstract: During charging, a quick charging device forms a battery module series circuit by connecting a third contact of a first switch to a second contact of the first switch, and connecting a fifth contact of a second switch to a twelfth contact of the second switch, so as to enable a charger to be connected to the battery module series circuit. During discharging, the quick charging device forms a battery module parallel circuit by connecting the third contact of the first switch to a first contact of the first switch, and connecting the fifth contact of the second switch to a fourth contact of the second switch, so as to enable a load unit to be connected to the battery module parallel circuit.

Abstract: Provided is a battery pack in which a bus bar for modules is provided on one side of a plurality of battery modules in a height direction, and connects the battery modules that are adjacent to each other among the plurality of battery modules, in series. In addition, the bus bar for modules includes a first bus bar piece that is provided in a battery module on one side between the battery modules that are adjacent to each other, and a second bus bar piece that is provided in a battery module on the other side and is different from the first bus bar piece, and a connection portion that connects the first bus bar piece and the second bus bar piece.

Abstract: A magnetic field detection sensor includes a first magneto-impedance element and a second magneto-impedance element each having a magnetic material, a bias coil applying a bias magnetic field to the magnetic body of the first magneto-impedance element, a high-frequency oscillation circuit supplying high-frequency current to the magnetic bodies of the first magneto-impedance element and the second magneto-impedance element, an AC bias circuit supplying AC bias current to the bias coil, a first detection circuit generating a first detection signal based on an impedance change of the first magneto-impedance element in a state of being applied with the bias magnetic field and an external magnetic field, and a second detection circuit which generates a second detection signal based on an impedance change of the second magneto-impedance element in a state of being applied with the external magnetic field and without the bias magnetic field.

Abstract: One-side plates of first and second condensers are connected to a one-side electrode of one of a plurality of secondary cells. First switches connect the other-side electrode of the secondary cell to the other-side plate of one of the first condenser and the second condenser. An MCU controls the first switches to connect the other-side electrode of the secondary cell to the other-side plate of the first condenser when the plurality of secondary cells is in a first state, and then connect the other-side electrode of the secondary cell to the other-side plate of the second condenser when the plurality of secondary cells is in a second state. A differential amplifier circuit outputs a differential voltage of voltages of the other-side plates of the first condenser and the second condenser. A cell monitoring IC detects states of the secondary cells based on the differential voltage.

Abstract: An internal resistance calculating device includes a charging unit charging a secondary battery, a voltage measuring unit measuring a both-end voltage value of the secondary battery, a capacitor holding a first voltage value predetermined by the both-end voltage value measured by the voltage measuring unit after charging is started, a capacitor holding, as a second voltage value, the both-end voltage value when charge current is changed for a predetermined current value or more within predetermined time after the both-end voltage value become the first voltage value, a current measuring unit measuring a first charge current value when the both-end voltage value become a threshold-value voltage and a second charge current value when the both-end voltage value become the second voltage value, and a ?COM calculating an internal resistance value of the secondary battery based on the first and second voltage values and the first and second charge current values.

Abstract: A magnetic field detection sensor includes a first magneto-impedance element and a second magneto-impedance element each having a magnetic material, a bias coil applying a bias magnetic field to the magnetic body of the first magneto-impedance element, a high-frequency oscillation circuit supplying high-frequency current to the magnetic bodies of the first magneto-impedance element and the second magneto-impedance element, an AC bias circuit supplying AC bias current to the bias coil, a first detection circuit generating a first detection signal based on an impedance change of the first magneto-impedance element in a state of being applied with the bias magnetic field and an external magnetic field, and a second detection circuit which generates a second detection signal based on an impedance change of the second magneto-impedance element in a state of being applied with the external magnetic field and without the bias magnetic field.

Abstract: A regenerative control device is provided with a host ECU configured to set a required amount of wheel regeneration that is an amount of wheel regeneration required for each wheel of a vehicle based on the required regeneration amount that is an amount of regeneration required in regenerative control that converts kinetic energy into electric energy depending on traveling conditions of a vehicle, and a regeneration controller configured to switch a wheel to be regenerative-controlled in a regeneration performance period shorter than a predicted vehicle behavior-appearance period from the start of regeneration in each wheel of the vehicle to the appearance of the behavior of the vehicle, that is, a period predicted based on the required amount of wheel regeneration and a vehicle speed, and control an actual amount of wheel regeneration for each wheel to the required amount of wheel regeneration.

Abstract: A voltage conversion device includes first and second converters. The first converter boosts an input voltage equal to or higher than a reference voltage (high regenerative voltage) to a first voltage more efficiently than the second converter boosting the input voltage equal to or higher than the reference voltage (high regenerative voltage) to the first voltage. The second converter boosts an input voltage lower than the reference voltage (low regenerative voltage) to a second voltage more efficiently than the first converter boosting the input voltage lower than the reference voltage (low regenerative voltage) to the second voltage. The voltage conversion device causes the first converter to boost the input voltage when the input voltage is equal to or higher than the reference voltage, and causes the second converter to boost the input voltage when the input voltage is lower than the reference voltage.

Abstract: During charging, a quick charging device forms a battery module series circuit by connecting a third contact of a first switch to a second contact of the first switch, and connecting a fifth contact of a second switch to a twelfth contact of the second switch, so as to enable a charger to be connected to the battery module series circuit. During discharging, the quick charging device forms a battery module parallel circuit by connecting the third contact of the first switch to a first contact of the first switch, and connecting the fifth contact of the second switch to a fourth contact of the second switch, so as to enable a load unit to be connected to the battery module parallel circuit.

Abstract: A quick charging device connects, in a charging operation, a plurality of battery modules in series, and connects the battery modules that are connected in series to a charger, and selects, in a discharging operation, one of the battery modules, and connects the selected battery module to a load unit. When the amount of charge in the battery module connected to the load unit drops by a predetermined amount during the discharging operation, the quick charging device connects another battery module having the largest amount of charge to the load unit.

Abstract: Provided are a charging rate leveling device and a power supply system including the charging rate leveling device capable of leveling more quickly a charging rate of a plurality of battery cells a battery pack includes. In the power supply system a controlling device includes a two-way DC/DC convertor connected to an auxiliary battery separated from the battery pack, a switch array capable of selectively connecting each of the plurality of auxiliary battery cells the battery pack includes to the two-way DC/DC convertor, so as to charge the battery cell with electric power of the auxiliary battery, and a controller controlling the switch array to connect the lowest voltage battery cell selected among the plurality of battery cells, so as to reduce a difference between charging rates SOC of each of the plurality of battery cells.

Abstract: An internal resistance calculating device includes a charging unit charging a secondary battery, a voltage measuring unit measuring a both-end voltage value of the secondary battery, a capacitor holding a first voltage value predetermined by the both-end voltage value measured by the voltage measuring unit after charging is started, a capacitor holding, as a second voltage value, the both-end voltage value when charge current is changed for a predetermined current value or more within predetermined time after the both-end voltage value become the first voltage value, a current measuring unit measuring a first charge current value when the both-end voltage value become a threshold-value voltage and a second charge current value when the both-end voltage value become the second voltage value, and a ?COM calculating an internal resistance value of the secondary battery based on the first and second voltage values and the first and second charge current values.

Abstract: One-side plates of first and second condensers are connected to a one-side electrode of one of a plurality of secondary cells. First switches connect the other-side electrode of the secondary cell to the other-side plate of one of the first condenser and the second condenser. An MCU controls the first switches to connect the other-side electrode of the secondary cell to the other-side plate of the first condenser when the plurality of secondary cells is in a first state, and then connect the other-side electrode of the secondary cell to the other-side plate of the second condenser when the plurality of secondary cells is in a second state. A differential amplifier circuit outputs a differential voltage of voltages of the other-side plates of the first condenser and the second condenser. A cell monitoring IC detects states of the secondary cells based on the differential voltage.

Abstract: Battery state-of-charge estimation apparatus detects current-passage state of charging/discharging current through a secondary battery just before passage of current stops, measures voltage value between both electrodes of the secondary battery after passage of charging/discharging current stops, measures elapsed time from when passage of charging/discharging current stops to when voltage value between both electrodes of the secondary battery is measured, estimates open-circuit voltage value using the detected current-passage state, the measured voltage value, the measured elapsed time, and open-circuit voltage value relationship information which relates to relationship between transition of voltage value between both electrodes of the secondary battery after passage of current stops and the open-circuit voltage value of the secondary battery and which is prepared for each current-passage state just before passage of charging/discharging current stops and previously stored in ROM of control unit.

Abstract: In a battery state detection device, a ?COM detects that, during charge by a charge part, a voltage between both electrodes of a secondary battery has reached a predetermined measurement start voltage set higher than a voltage between the both electrodes of the secondary battery at the time of complete discharge, and detects that, during the charge by the charge part, the voltage between the both electrodes of the secondary battery has reached a predetermined measurement finish voltage set higher than the measurement start voltage. Then, the ?COM measures an amount of integrated power given to the secondary battery in a period from the detection of the measurement start voltage to the detection of the measurement finish voltage, and detects an SOH of the secondary battery based on the amount of integrated power measured by integrated power amount measurement unit.

Abstract: A battery state detection device capable of suppressing falling in detection precision of a battery state is provided. A battery state detection device retains a voltage between electrodes of a secondary battery in a first capacitor under charging conducted by a charging unit. When the voltage between the electrodes of the secondary battery has become a predetermined state detection voltage, the battery state detection device stops charging of the secondary battery, and connects a second capacitor between the electrodes of the secondary electrode. When a charge flows into the second capacitor and the voltage of the second capacitor has become stable, the battery state detection device detects internal resistance of the secondary battery based on a charging current and an amplified voltage output from an amplifier configured to amplify a difference value between the voltage retained in the first capacitor and the voltage retained in the second capacitor.