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Battery pack, protection circuit and method thereof

A technology for protecting circuits and battery packs, which is applied to emergency protection circuit devices, circuit devices, emergency protection devices for automatic disconnection, etc., and can solve the problems of inconvenient use of polysilicon fuses and their configuration, and battery pack failure.

Inactive Publication Date: 2012-04-11
RICHPOWER MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

This protection mode except having above-mentioned shortcoming, because polysilicon fuse 18, batteries 12,22,24 are all connected in series, so as long as wherein any battery takes place abnormal state, for example battery 22, then polysilicon fuse 18 will melt And cutting off the current path causes the battery pack 20 to fail to work.
[0004] In the above protection methods, the use and configuration of polysilicon fuses cause inconvenience to users, so new solutions need to be sought

Method used

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  • Battery pack, protection circuit and method thereof
  • Battery pack, protection circuit and method thereof
  • Battery pack, protection circuit and method thereof

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Embodiment Construction

[0041] refer to image 3 and Figure 4 , the multi-cell battery pack 26 according to the present invention includes a protection circuit 28 to provide intelligent protection against abnormal operation. In the protection circuit 28, the protection switch SW1 and the batteries 12, 22, 24 are connected in series between the electrodes 14 and 16, and the detection circuit 30 is connected to the two ends of the battery strings 12, 22, 24 to provide power and detect whether the For abnormal operations, such as overcurrent or overheating, the control circuit 32 is also connected to the two ends of the battery strings 12, 22, 24 to provide power, and determines the control signal CS1 to control the protection switch SW1 according to the output signal PS1 of the detection circuit 30. The protection switch SW1 is an electronic switch, such as a power MOSFET. The battery pack 26 is in a normal state, such as image 3 As shown, the protection switch SW1 is turned on, and once an abnorm...

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Abstract

The invention provides a battery pack, a protection circuit and a method thereof. An electrical switch is used to provide intelligent type protection for the battery pack to confront abnormal operation. The protection circuit and method are used to detect a cell state so as to control the electrical switch and eliminate the cell with abnormal state. Once the abnormal state disappears, the battery pack can return to a normal state.

Description

technical field [0001] The present invention relates to a battery pack, in particular to a protection circuit and method for the battery pack. Background technique [0002] A battery pack is a group of any number of cells packaged in series, parallel or a combination of series and parallel to provide a desired voltage, capacity or power density. Such as figure 1 As shown, a single cell battery pack 10 includes a single cell 12 connected between electrodes 14 and 16 . To provide protection, a polysilicon fuse 18 is added in series with the battery 12 . When the battery 12 operates abnormally, such as overcurrent or overtemperature, a large amount of heat will be generated to melt the polysilicon fuse 18 , thereby preventing the battery pack 10 from being damaged. However, it takes hundreds of milliseconds for the polysilicon fuse 18 to melt, so the reaction speed of this protection method is very slow, and after the polysilicon fuse 18 melts, a new polysilicon fuse must be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/18H02H3/06
Inventor 王钦辉韩颖杰蓝鹏儒
Owner RICHPOWER MICROELECTRONICS
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