A backup power supply device having a short charging time is provided. The backup power supply device for supplying power when a main power supply is under a power failure includes first and second battery packs connected in parallel, a charging circuit for charging the first and second battery packs, first and second discharging switches for causing the first and second battery packs to discharge to the load device respectively, and a control unit. The control unit compares the battery voltages of the first and second battery packs with an output voltage from the main power supply. The control unit sets the first and second discharging switches to ON when the battery voltages are lower than the output voltage. When the battery voltage of the battery pack exceeds the output voltage of the main power supply due to charging, the control unit sets the first discharging switch and the second discharging switch to OFF. Thereafter, after the first and second battery packs are fully charged, the control unit switches the first and second discharging switches to ON when the battery voltage has dropped to a dischargeable upper limit voltage.

A charging method for battery, including: in an n-th charging process, charging a first battery to a charge cut-off voltage U.sub.n and a charge cut-off current I.sub.n in a first charging manner; then, leaving the first battery standing, and obtaining an open-circuit voltage OCV.sub.n of the first battery at a standing time of t.sub.i; in an m-th charging process and subsequent charging processes, charging the first battery to the charge cut-off voltage U.sub.n and the charge cut-off current I.sub.n in the first charging manner; then, leaving the first battery standing, and obtaining an open-circuit voltage OCV.sub.m of the first battery at the standing time of t.sub.i; and under the condition of OCV.sub.n>OCV.sub.m, continuing to charge the first battery that has been standing in a second charging manner until the charge cut-off current of the first battery is a first current I.sub.m, where I.sub.m=(U.sub.n−k×OCV.sub.n−(1−k)×OCV.sub.m)/(U.sub.n−OCV.sub.m)×I.sub.n, and 0<k≤1.

A charging method for battery includes: in an n-th charging process, charging a first battery to a charge cut-off voltage U.sub.n in a charging manner; after the n-th charging process is completed, leaving the first battery standing, and obtaining an open-circuit voltage OCV.sub.n, of the first battery at a standing time of t.sub.i; in an m-th charging process, charging the first battery to the charge cut-off voltage U.sub.n in the charging manner, where m>n; after the m-th charging process is completed, leaving the first battery standing, and obtaining an open-circuit voltage OCV.sub.m of the first battery at the standing time of t.sub.i; and under the condition of OCV.sub.n>OCV.sub.m, in an (m+1)-th charging process and subsequent charging processes, charging the first battery to a first charge cut-off voltage U.sub.m+1 in the charging manner, where U.sub.m+1=U.sub.n+k×(OCV.sub.n−OCV.sub.m), and 0<k≤1.

The present disclosure relates to a converter system for transferring electric power, a vehicle comprising such a converter system and a method for transferring electric power. The converter system comprises a first DC/DC converter module, a second DC/DC converter module and a control unit. The first DC/DC converter module is connectable to a first high voltage system and at least to a first low voltage system. The second DC/DC converter module is connectable to a second high voltage system and at least to the first low voltage system. The first DC/DC converter module comprises at least a first main DC/DC converter unit and a first micro DC/DC converter unit. The second DC/DC converter module comprises at least a second micro DC/DC converter unit. The first micro DC/DC converter unit and the second micro DC/DC converter unit are connectable via a first bidirectional switch unit. The control unit is configured to transfer the electric power from the first high voltage system to the first low voltage system via the first micro DC/DC converter unit, if the first main DC/DC converter unit is deactivated. The control unit is further configured to open the first bidirectional switch unit to transfer the electric power from the second high voltage system to the first low voltage system via the second micro DC/DC converter unit, if the first main DC/DC converter unit is deactivated and the first micro DC/DC converter unit has a failure.

A system includes a communications module having a first interface and a second interface. The first interface is on an opposite surface of the communications module from the second interface. The system also includes a battery pack to receive power tool operating information, where the battery pack removably couples with the communications module via the second interface. The battery pack transfers a portion of the power tool operating information and/or a portion of battery pack operating information to the communications module via the second interface. The system also includes a charger module to removably couple with the communications module via the first interface, where the charger module recharges the battery pack through the first and second interfaces of the communications module.

The disclosure provides a charger, a charging device, an energy supply device and a control method of the charger. The charger comprises a housing, a charging position, a charging port and a first heat dissipation unit. The charger comprises a base and a supporting part. The supporting part is arranged on the base. The charging position is arranged on the base and distributed around the supporting part. The charging port is arranged on the charging position and matched with a battery pack. The first heat dissipation unit is arranged on the supporting part for heat dissipation of the battery pack. With the charger of the disclosure, multiple battery packs can be charged at the same time.

A battery management apparatus includes a charging unit configured to charge a battery cell, a measuring unit configured to measure voltage and current of the battery cell, and a control unit configured to receive battery information including the voltage and current from the measuring unit, estimate a SOC of the battery cell based on the received battery information, calculate an internal resistance of the battery cell based on the battery information whenever the SOC of the battery cell increases by a criterion amount, compare a change pattern of the calculated internal resistance with a preset criterion pattern, and set a negative electrode capacity for the battery cell based on the comparison result.

Multi-port power adapters. At least one example is a method including: supplying a first bus voltage to a first device by way of a DC-DC converter coupled to a link voltage; supplying a second bus voltage to a second device by way of a second DC-DC converter coupled to the link voltage; converting an AC voltage to the link voltage by way of an AC-DC converter; selecting, by a shunt regulator, a setpoint for the link voltage based on the first bus voltage and the second bus voltage; and regulating the link voltage to the setpoint by the AC-DC converter.

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 battery module comprising a plurality of battery cell units, each one comprising: a battery cell having a first pole and a second pole, and a switch circuit, comprising a plurality of switches, and a switch controller arranged to control the switches of the switch circuit to enter either of a first state, in which the battery cell is connected in parallel with a neighboring battery cell, and a second state, in which the battery cell is connected in series with a neighboring battery cell. The battery module is configured to control the switching between the first and second states on a probabilistic basis.