A power tool system includes a power tool and a battery pack for supplying power to the power tool, where the battery pack includes a cell assembly and a temperature acquisition unit configured to acquire the temperature of the cell assembly; a current detection unit configured to detect an operating current of the battery pack; and a power management unit connected to the temperature acquisition unit and the current detection unit and configured to manage charging or discharging of the battery pack. The power management unit is configured to output a current prohibition signal for prohibiting the charging or discharging of the cell assembly when a predetermined prohibition duration elapses after the operating current reaches a predetermined value; and adjust the predetermined prohibition duration based on at least two of the operating current, the temperature of the cell assembly, and a characteristic parameter of a cell unit.

The present document describes techniques for extending battery life after long-term and high-temperature storage. These techniques delay charging of a battery to detect battery conditions and determine whether the battery was exposed to high temperatures while in an idle or low-power state for a long period of time. These techniques include a methodology to relax and refresh an anode surface of the battery, after high-temperature storage, through distinct and tailored discharges prior to beginning a normal charge profile. These techniques can be applied to a wide range of chemistry platforms, which may have kinetic (Li-ion) limitations, to extend the longevity of the battery by reducing lithium plating and capacity degradation caused by long-term, high-temperature storage.

There is provided a vehicle backup apparatus that easily supplies sufficient power to a load when supplying of power from a power supply unit has entered a failure state. In a vehicle power supplying system including a power supply unit that supplies power to a load, a vehicle backup apparatus performs a backup operation when the supplying of power from the power supply unit is in a failure state. The vehicle backup apparatus includes a charging/discharging unit for performing charging and discharging of a backup power supply that includes a battery and a capacitor and is a different power source to the power supply unit; and a control unit for controlling the charging/discharging unit. When the failure state has been entered, the control unit causes the charging/discharging unit to perform the backup operation so as to supply power based on the battery and the capacitor to the load.

A control device configured to control an auxiliary battery mounted on a vehicle includes: a first processing unit setting an allowable charging current of the auxiliary battery based on a state of the vehicle and a state of the auxiliary battery; and a second processing unit controlling charging of the auxiliary battery based on the allowable charging current.

A method according to the present disclosure includes: a state estimation processing of obtaining a charge/discharge current, a battery voltage, and a temperature to estimate state-of-charge and a state of a secondary battery; an automatic adaptation processing of updating battery parameters applied to a state estimation model used in the state estimation processing so as to be adapted to a current state of the secondary battery; and a suppression control processing of limiting an output of the secondary battery based on a result of estimation performed utilizing the state estimation model and executing a suppression control processing for prolonging the battery life of the secondary battery, the respective processing being implemented by automated computation performed by a computer, in which in the suppression control processing, execution of suppression control is refrained until the battery parameters show a degree of adaptation equal to or greater than a preset threshold.

In a power supply system, rechargeable battery modules and a load are connected in parallel with a power supply bus. Each rechargeable battery module includes a rechargeable battery and a conversion circuit. A positive electrode and a negative electrode of the rechargeable battery of each rechargeable battery module are connected to the paired primary-side terminals, respectively, of the conversion circuit. The rechargeable battery of each rechargeable battery module is connected in series to the paired secondary-side terminals of the conversion circuit. The power supply system is configured to control the conversion circuit of each rechargeable battery module to simultaneously execute the energization operation and the temperature-raising operation.