A device according to one embodiment includes a first battery to output alternating-current power for driving a motor and connected to a first main circuit that is connected to an inverter; a second battery connected to a second main circuit, having a storage capacity larger than it of the first battery, and having a permissible power output per unit storage capacity smaller than it of the first battery; a DC/DC converter to convert a voltage of the second main circuit to a predetermined voltage and output to the first main circuit; a control circuit to control charging and discharging operations of the first and the second battery and an operation of the DC/DC converter; a first terminal connected to a positive terminal of the first battery; and a second terminal connected to a negative terminal of the first battery.

A battery system includes a battery cell, a thermoelectric cooler (TEC) that cools the battery cell, a temperature sensor that detects a temperature of the battery cell, and a battery management unit (BMU) controller. The BMU controller activates the TEC to cool the battery cell in response to determining that a state of charge (SOC) of the battery cell is greater than a threshold SOC and the temperature of the battery cell is greater than a threshold temperature.

A method for charging a battery set of an autonomous vehicle including: determining charging requirements of the battery set of the autonomous vehicle via a communication from the autonomous vehicle to a charging station, in response to the communication from the autonomous vehicle, connecting a plurality of batteries of the charging station in a first combination to match the charging requirements of the battery set of the autonomous vehicle; and charging the battery set of the autonomous vehicle using the plurality of batteries of the charging station in the first combination.

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 control the power converter in accordance with a control variable. The control circuitry may include a first control mechanism configured to generate a first intermediate control variable based on a first physical quantity associated with the power delivery system, a second control mechanism configured to generate a second intermediate control variable based on a second physical quantity associated with the power delivery system, a selector configured to select the control variable from the first intermediate control variable and the second intermediate control variable, and a shared feedback memory element configured to feed back the control variable to inputs of the first control mechanism and the second control mechanism, such that the first control mechanism generates the first intermediate control variable based on the first physical quantity and the control variable, and the second control mechanism generates the second intermediate control variable based on the second physical quantity and the control variable.

A battery-powered node includes a primary cell, a secondary cell, and a battery controller. The battery controller includes a current source that draws power from the primary cell to charge the secondary cell. The battery-powered node draws power from the secondary cell across a wide range of current levels. When the voltage of the secondary cell drops beneath a minimum voltage level, the current source charges the secondary cell at a constant current level and a charging signal is sent to the battery-powered node. When the voltage of the second cell exceeds a maximum voltage level, the current source stops charging the secondary cell and the charging signal is terminated. The battery-powered node records the amount of time the charging signal is active, which can be used to determine a battery depletion level for the primary cell. Battery replacement may then be efficiently scheduled based on the depletion level.

A respiratory therapy device generates a flow of breathable gas for therapy. The apparatus may include a flow generator in a housing to generate the breathable gas flow. The flow generator may have an operating voltage for such operations. The device may include a battery pack that is engageable with the housing. The battery pack may be configured to power the flow generator and may include a stand-by circuit configured to switch between stand-by and operating modes. The stand-by circuit may be configured to provide a stand-by operations voltage while in the stand-by mode that is less than an operating voltage of the flow generator and may be configured to detect current demand of the flow generator with the stand-by operations voltage while in stand-by mode such as for enabling an increase voltage from the battery pack to produce the operating voltage in the operating mode for the flow generator.

Operating electric power is preferably supplied to a battery assembly control circuit from both a power converting device and a battery module. An electricity storage device includes a battery module including battery cells and a battery assembly control circuit, and a power converting device configured to charge the battery module with a commercial power supply and to supply electric power to a load. The power converting device supplies electric power to the battery assembly control circuit while an output voltage of the power converting device is higher than a predetermined voltage. The battery module starts to supply operating electric power to the battery assembly control circuit upon detecting that the electric power from the power converting device starts to be supplied to the battery assembly control circuit. The battery module stops supplying the electric power to the battery assembly control circuit when the battery module stops being discharged.

A secondary battery protection circuit for controlling charge and discharge using a switching circuit to protect a secondary battery from temperature is provided. The switching circuit is configured to be provided in a charge-and-discharge path between the secondary battery and an external device. The secondary battery protection circuit includes a detection terminal configured to be electrically connected, via a resistor, to between the switching circuit and the external device. The secondary battery protection circuit includes a first terminal configured to be electrically connected to a temperature detection terminal of the external device. The secondary battery protection circuit includes a second terminal to which a temperature sensitive element is configured to be electrically connected, the temperature sensitive element having a characteristic value varying in accordance with a change in temperature of the secondary battery.

A mobile device for avoiding accidental shutdown includes a battery cell, a controller, and a jack element. The controller defines a first delay time and a second delay time. The first delay time is relative to the ODCP (Over Discharge Current Protection) of the battery cell. The second delay time is relative to the OVP (Over Voltage Protection) of the battery cell. When a plug of a power supply device is unplugged from the jack element, the controller detects an SOH (State of Health) of the battery cell. The controller compares the SOH with a first threshold ratio and a second threshold ratio. Then, the controller extends the first delay time and the second delay time according to a first multiplier, a second multiplier, or a third multiplier.

Disclosed is an eco-friendly vehicle capable of conveniently canceling a protection mode when the protection mode is entered due to a voltage drop of a low-voltage battery, and a power management method therefor. A power management method for an electrified vehicle may comprise controlling, by a power management controller, an out-vehicle switch from a first mode for changing a locked state to a second mode for battery reset when there is a request for entry into a protection mode for a low-voltage battery from a BMS, and entering the protection mode when the out-vehicle switch is changed to the second mode.