A head-wearable device comprising a larger battery, a smaller battery, one or more electronic components, and memory including executable instructions for causing the head-wearable device to perform operations is described. The operations are performed in response to a request to perform a computational task. The operations include, in accordance with a determination that a larger battery charge is above a larger battery charge threshold and a smaller battery charge is above a smaller battery charge threshold, providing power from the larger battery and the smaller battery to the one or more electronic components. The operations further include, in accordance with a determination that the larger battery charge is above the larger battery charge threshold and the smaller battery charge is below the smaller battery charge threshold: (i) deactivating a discharging path of the smaller battery and (ii) providing power from the larger battery to the one or more electronic components.

An electric assembly for an aircraft is provided that includes a battery string, a switch, a battery charging system, and a charge monitoring device. The battery string includes a plurality of battery modules and a contactor. The plurality of battery modules are electrically connected in series. The contactor is disposable in an open configuration or a closed configuration. The battery charging system is in communication with the battery string, and configured to perform a charging operation of the battery string. The charge monitoring device includes a processor and non-transitory memory. The non-transitory memory stores instructions executable by the processor, causing the processor to determine a charging parameter of the contactor, identify the presence of a fault condition for the contactor, and signal the switch to actuate the contactor to the open configuration. The presence of the fault condition indicates the charging parameter exceeds the fault condition threshold.

A method of controlling a battery charger to charge a battery includes setting a fan speed threshold for a fan within a battery charger, wherein the fan speed threshold is less than a maximum fan speed of the fan. The operating speed of the fan in the battery charger is controlled so as not to exceed the fan speed threshold and the battery charger is controlled to deliver a first charge current such that a temperature of the battery charger does not exceed a first temperature threshold while the operating speed of the fan remains at or below the fan speed threshold. A user input is received to engage a fast charge mode and, in response thereto, the operating speed of the fan is increased above the fan speed threshold so as not to exceed the maximum fan speed.

A temperature of a power device to which a power storage device is attached is estimated on the basis of a temperature detected by a temperature detector provided in a power storage device detachably held in the power device.

An ECU executes a process including the steps of: acquiring parameters; calculating an integrated value Q1 of a charging current when detection of a step is not confirmed; acquiring the temperature of each cell when detection of a step is confirmed; calculating an integrated value Q2 of the charging current until charging is completed; once the charging is completed, calculating a correction factor C; and calculating a full charge capacity.

A battery management apparatus according to the present disclosure includes: a temperature detection unit configured to detect a temperature of a lithium-ion secondary battery; a high-frequency signal supply unit configured to supply a high-frequency signal of 0.1 MHz or higher to the lithium-ion secondary battery; an impedance detection unit configured to detect a value of a real part of an AC impedance from the lithium-ion secondary battery to which the high-frequency signal has been supplied; a calculation unit configured to calculate an amount of Li precipitation in the lithium-ion secondary battery from the detected value of the real part of the AC impedance; and a control unit configured to, based on the calculated amount of Li precipitation in the lithium-ion secondary battery, control an allowable charging power for the lithium-ion secondary battery and control an upper limit temperature of the lithium-ion secondary battery.

Provided are a to-be-charged device and a charging method. The method includes: identifying a type of a power supply device connected to the to-be-charged device through a charging interface of the to-be-charged device; in response to the type being a first type, controlling the battery unit to be charged in a first charging mode through the first charging circuit; and in response to the type being a second type, controlling the battery unit to be charged in a second charging mode through the first charging circuit; wherein a maximum output power of the power supply device of the first type is greater than a maximum output power of the power supply device of the second type; a maximum charging current of the battery unit in the first charging mode is greater than a maximum charging current of the battery unit in the second charging mode.

A power tool may include a power tool housing. A power tool may include a drive unit located within the power tool housing. A power tool may include a power tool controller located within the power tool housing, the power tool controller configured to: receive a signal from battery pack, the signal indicative of a temperature of the battery pack, and do not limit a drive unit power if the temperature is less than a temperature threshold.

A temperature prediction method and apparatus, an electronic device, a storage medium, and an energy storage system. The method includes: obtaining an ambient temperature and battery parameters of the energy storage device; obtaining a current first power, a third power, and a fourth power of the energy storage device; when a difference between the second power and the current first power is not less than the fourth power, determining a state of the energy storage device; outputting the predicted first power according to the state of the energy storage device; predicting the battery temperature of the energy storage device based on the ambient temperature, the battery parameters, and the predicted first power.

A method including: charging a capacitor in parallel to the ESD; determining whether an energy storage device (ESD) is in use; monitoring temperature of the ESD, the ESD has a prescribed and operational temperature range; discharging the capacitor through an inductor by temporary actuation of a switch that couples the inductor in parallel to the capacitor, wherein oscillation of current and voltage is provided by a first circuit formed by the capacitor and the inductor, maintaining the ESD temperature within temperature range through oscillation of the ions due to high frequency oscillation of a second circuit formed by the capacitor and the internal inductance of the ESD, repeating the temporary reactuation of the switch while temperature is within the temperature range. Wherein the given temperature range is the prescribed temperature range when the ESD is not being used and is the operational temperature range when the ESD is being used.