A power storage device (4) includes a power storage unit (1211) including a plurality of cells, and a BMU (1212) configured to control the power storage unit (1211). The BMU (1212) includes an upper limit power acquisition unit (23) configured to acquire, based on a SOC and a temperature of the power storage unit (1211), an upper limit power that is an upper limit of a power output from the power storage unit (1211) or a power input to the power storage unit (1211).

A vehicle includes a battery, an electric power acquirer, a relay, a pre-charge relay, a power supply unit, and a controller. The controller performs a control of electric power transmission through a power line of the vehicle. The controller executes pre-charge processing on a request for operation of the power supply unit, with the relay being in a disconnected state, and with the electric power acquirer being available for electric power acquisition. The pre-charge processing includes raising a voltage of the power line by switching the pre-charge relay. The controller causes a transition of a mode of the electric power transmission to a direct transmission mode. The direct transmission mode includes transmitting electric power acquired by the electric power acquirer to the power supply unit.

A charging control device includes a processor. The processor is configured to control charging of a plurality of battery cells that configure an assembled battery, during charging, in a case in which a voltage value of a battery cell having a highest voltage among the plurality of battery cells is equal to or greater than a threshold value and a current value is equal to or less than a set value, measure a closed circuit voltage (CCV) of the plurality of battery cells, and for a battery cell for which a potential difference with respect to a voltage of a battery cell with a lowest measured CCV is equal to or greater than a predetermined value, execute discharging processing so as to eliminate the potential difference.

A management method for a battery system having parallel battery packs includes a charging control operation of sequentially closing battery packs having a low voltage value level and completing a charging of the battery packs. The purpose of the present invention is to provide a management method for a battery system having parallel battery packs which is applicable to multiple parallel battery packs being charged in parallel, to solve the technical problems that a safe and stable operation of the entire battery packs cannot be ensured caused by the failure of the battery packs, and excessive current impact may be generated due to an excessive voltage difference among the battery packs.

Method for balancing states of charge of an electrical energy store with a plurality of battery cells.

Provided is a charging/discharging control device (100) which, for an assembled battery (10) including a plurality of storage batteries (1) connected in series, detects capacity variation among the storage batteries (1) and controls charging/discharging of the assembled battery (10). The charging/discharging control device (100) of the present invention includes a charging/discharging control unit (2) which calculates an electric-charge-quantity corresponding value which is a value corresponding to an electric charge quantity of the assembled battery (10), on the basis of a current value of the assembled battery (10), and calculates, as a voltage second-order derivative value, a value obtained through second-order differentiation of open-circuit voltage of the assembled battery (10) with respect to the electric-charge-quantity corresponding value. When a predetermined charging-stop condition is satisfied, the charging/discharging control unit (2) performs control to stop charging, and determines whether or not there is capacity variation among the plurality of storage batteries (1) in the assembled battery (10), on the basis of the voltage second-order derivative value when the charging-stop condition is satisfied.

Described herein are methods and systems for updating SOC estimates of individual cells in battery packs. Specifically, SOC estimates are updated in-situ, e.g., while the battery packs remain operational. For example, a cell is charged or discharged, independently from other cells, until the cell OCV is at a set value, corresponding to one of target zones. The target zones have more prominent correlations between the OCV and SOC than other parts of the OCV profile. A new SOC value, corresponding to the cell OCV, is used to update the SOC estimate. In some examples, a set of voltages is obtained while the cell is charged or discharged at a constant current/power, e.g., outside of the target zones. One or more differential capacities are determined from this voltage set, and a new SOC value is obtained based on these differential capacities.

A battery control device that controls a battery assembly includes a first determining unit that determines whether a voltage difference between minimum and maximum values of OCVs of battery cells constituting the battery assembly and having an SOC-OCV characteristic curve including a flat region is equal to or larger than a predetermined voltage value, a second determining unit that determines whether the OCV of each battery cell is lower than a lower-limit voltage of the flat region, or is equal to or higher than the lower-limit voltage and lower than an upper-limit voltage, or is higher than the upper-limit voltage, a controller that executes control selected from SOC raising control, SOC lowering control, and SOC keeping control of the battery cells, based on determination results of the first and second determining units, and a processor that homogenizes the SOCs of the battery cells controlled by the controller.

A power delivery system may include a power converter configured to electrically couple to a power source and further configured to supply electrical energy to one or more loads electrically coupled to an output of the power converter, and control circuitry configured to select a constraint factor from a plurality of different constraint factors based on at least one of an input voltage to the power converter and a power level available to the power converter, and control the power converter in accordance with the constraint factor.

An electronic device and a method thereof are provided. The electronic device includes a memory, a battery, a charging circuit for charging the battery using current supplied from a power supply device, a slew rate variable circuit electrically connected to the charging circuit, and a processor electrically connected to the memory, the battery, the charging circuit, and the slew rate variable circuit. The processor is configured to control the charging circuit to control the charging of the battery, to monitor a state of the electronic device during battery charging, and to control the slew rate variable circuit based on the state of the electronic device to change a slew rate related to the battery charging.