A battery cell balance circuit includes an AC/DC converter, a plurality of battery cells, a plurality of switches, an isolated DC/DC converter, a circuit switch, and a control unit. The AC/DC converter receives an AC power. The battery cells are connected in series to form a battery link. Each switch is correspondingly connected to one battery cell. The isolated DC/DC converter is coupled to the switches and coupled to the battery link in series. The circuit switch is coupled between the AC/DC converter, the isolated DC/DC converter, and the plurality of switches. The control unit provides a plurality of control signals to correspondingly control the plurality of switches and the circuit switch.

A charging management apparatus includes a main relay connected between a positive electrode terminal of a battery pack and a charging terminal of a charging connector, a current regulator connected in parallel to the main relay and including a precharge relay and a resistance regulation circuit connected in series, a battery pack voltage sensor, a battery pack current sensor, and a controller to control the main relay is into an on state and the precharge relay into an off state in response to a first switching condition while the main relay is in the off state, the resistance regulation circuit at a first resistance value and the precharge relay is in the on state, and to control the resistance regulation circuit to a second resistance value, the precharge relay into the on state and the main relay into the off state, in response to a second switching condition.

A battery module in an energy storage device used with a plurality of battery modules in a battery rack and including a rack fuse that cuts off a circuit when an overcurrent occurs includes a battery cell and a module fuse for cutting off a circuit when overcurrent occurs, the module fuse starts to melt later than a melting completion time point of the rack fuse.

The present disclosure provides a portable standby starting device for a vehicle. The portable standby starting device includes a battery circuit, a load access detecting circuit, and a vehicle starting circuit, wherein the battery circuit is coupled to the load access detecting circuit and the vehicle starting circuit, and is configured to supply power to the load access detecting circuit and the vehicle starting circuit; the load access detecting circuit is coupled to the vehicle starting circuit, and is configured to detect whether the vehicle starting circuit is connected to a vehicle load; the vehicle starting circuit is configured to, when the load access detecting circuit detects the connection of the vehicle load, output a vehicle starting current for controlling an ignition operation performed for the vehicle.

A current detection circuit includes a current sampling branch, a switch branch, a first current mirror branch, a capacitor branch, a feedback branch and a control branch. The control branch receives the second current and outputs the first current and the first voltage signal. The current sampling branch outputs a first discharging current. The switch branch establishes and disconnects the connection between the first current mirror branch and the capacitor branch. The capacitor branch is charged in response to the first charging current and discharged in response to the first discharging current. The first current mirror branch outputs the first charging current. The feedback branch adjusts the second charging current to adjust the first charging current, so that the total charge of the capacitor branch is balanced with the total charge of discharge within one switching cycle, so that the first current is represented by the first charging current.

A wireless power receiving device includes: a wireless power receiving coil, an AC-DC circuit, a capacitor buck circuit, and a battery, wherein the capacitor buck circuit includes at least two capacitors and a switch; an output terminal of the wireless power receiving coil is connected to an input terminal of the AC-DC circuit, and an output terminal of the AC-DC circuit is connected to an input terminal of the capacitor buck circuit, and an output terminal of the capacitor buck circuit is connected to the battery; in a case that the switch is in a first connection state, the at least two capacitors are in a series state and store energy; and in a case that the switch is in a second connection state, the at least two capacitors are in a parallel state and release energy.

A rechargeable battery jump starting device with a control switch backlight system. The control switch backlight system is configured to assist a user viewing the selectable positions of the control switch for selecting a particular 12V or 24V operating mode of the portable rechargeable battery jump starting device in day light, sunshine, low light, and darkness.

The present invention detects a predictive abnormal phenomenon in a battery pack and prevents the use of the battery pack before power is shut off at a fuse. The battery pack comprises: a battery cell; a connection unit which is electrically connected to the battery cell and is connected to an external electrical apparatus main body; and a control unit which controls the battery cell, wherein, when detecting an abnormal state such as chattering, the control unit causes a charge prevention signal (LS) and a discharge prevention signal (LD) to be continuously output and makes the charge and discharge of the battery pack impossible (steps 226-228). The continuous output of these prevention signals is configured not to be negated by an operation of a user, and the battery pack can be made unusable by software control.

A battery and an electronic device are provided. The battery includes a battery cell, including at least one anode of the battery cell and at least one cathode of the battery cell. The battery also includes a voltage detection circuit, wherein the voltage detection circuit detects a voltage of the battery cell. Further, the battery includes a protection circuit, wherein the protection circuit protects the battery cell based on the voltage of the battery cell detected by the voltage detection circuit.

According to one embodiment; a wireless power transmission system includes; an AC power source; a power transmission resonator; a power reception resonator; an AC/DC converter; a first circuit disposed between the AC power source and the power transmission resonator; and a second circuit disposed between the power reception resonator and the AC/DC converter. Parameter values of passive elements in the first and second circuits are set so that an absolute value of an inverse transfer function between an input voltage and an output voltage of a target system at a frequency of the AC voltage is equal to or less than a divided value of the AC voltage by a battery voltage while the AC voltage is increased from a first voltage value to a second voltage value, the target system comprising the first circuit, the power transmission resonator; the power reception resonator, the second circuit and the AC/DC converter.