Battery pack and charging assembly

Patent metadata

Field	Value
Publication number	US-2021021144-A1
Application number	US-202017060117-A
Country	US
Kind code	A1
Filing date	Oct 1, 2020
Priority date	Apr 2, 2018
Publication date	Jan 21, 2021
Grant date	—

Abstract

A battery pack is detachably connectable to an electric tool or a charger and includes a housing, a cell group, a first voltage monitoring module, a control module, a second voltage monitoring module and a protection module. The cell group includes a plurality of cells electrically connected to each other. The first voltage monitoring module monitors at least one of the voltage of each cell or the total voltage of the cell group. The second voltage monitoring module monitors the voltage of each cell to detect whether the cells are in an overvoltage state. The protection module is electrically connected to the second voltage monitoring module and when the second voltage monitoring module monitors that any one of the cells is in the overvoltage state, cuts off a charging path formed between the battery pack and the charger.

First claim

What is claimed is:

1 . A battery pack detachably connectable to an electric tool or a charger and comprising:
a housing; a cell group comprising a plurality of cells electrically connected to each other, wherein the cell group is disposed in the housing; a first voltage monitoring module configured to monitor at least one of a voltage of each of the plurality of the cells or a total voltage of the cell group; a control module electrically connected to the first voltage monitoring module and configured to control a charging process of the cell group; a second voltage monitoring module configured to monitor the voltage of each of the plurality of the cells to detect whether the plurality of the cells are in an overvoltage state; and a protection module electrically connected to the second voltage monitoring module and configured to, when the second voltage monitoring module monitors that any one of the plurality of the cells is in the overvoltage state, cut off a charging path formed between the battery pack and the charger.

2 . The battery pack of claim 1 , wherein the battery pack further comprises a communication terminal configured to at least transmit a signal of the battery pack to the charger or the electric tool, the protection module is connected in series between the second voltage monitoring module and the communication terminal, and the protection module is configured to, when the second voltage monitoring module monitors that any one of the plurality of the cells is in the overvoltage state, send the signal to the charger through the communication terminal to generate, in the charger, a signal for stopping a charging current from flowing to the battery pack.

3 . A charging assembly, comprising:
a battery pack; and a charger; wherein the battery pack comprises: a housing; a cell group comprising a plurality of cells electrically connected to each other, wherein the cell group is disposed in the housing; a first voltage monitoring module configured to monitor at least one of a voltage of each of the plurality of the cells or a total voltage of the cell group; a control module electrically connected to the first voltage monitoring module and configured to control a charging process of the cell group; a second voltage monitoring module configured to monitor the voltage of each of the plurality of the cells to detect whether the plurality of the cells are in an overvoltage state; a protection module electrically connected to the second voltage monitoring module and configured to, when the second voltage monitoring module monitors that any one of the plurality of the cells is in the overvoltage state, cut off a charging path formed between the battery pack and the charger and a communication terminal configured to at least transmit a signal of the battery pack to the charger or the electric tool; and the protection module is connected in series between the second voltage monitoring module and the communication terminal and configured to, when the second voltage monitoring module monitors that any one of the plurality of the cells is in the overvoltage state so that the charger stops a charging current from flowing to the battery pack, output a charging prohibition signal to the charger through the communication terminal.

4 . The charging assembly of claim 3 , wherein the protection module comprises an electronic switch electrically connected to the second voltage monitoring module and a temperature sensor, connected in series between the electronic switch and the communication terminal, and the electronic switch is configured to, when the second monitoring module monitors that any one of the plurality of the cells is in the overvoltage state, cut off a conductive path of the temperature sensor.

5 . The charging assembly of claim 3 , wherein the charger comprises a charging communication terminal connectable to the communication terminal of the battery pack to receive the charging prohibition signal, a charging control module electrically connected to the charging communication terminal, and a charging switch electrically connected to the charging control module, and the charging control module is configured to output a control signal according to the received charging prohibition signal to turn off the charging switch so that the charger stops the charging current from flowing to the battery pack.

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Geng Zheng
• Liu Hehan
• Yang Dezhong

Classifications

• H02J7/61

  against overcharge · CPC title

• H02J7/82

  Control of state of charge [SOC] · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title

• H02J7/60

  including safety or protection arrangements · CPC title

• H02J7/50

  acting upon multiple batteries simultaneously or sequentially · CPC title