Lithium battery protection system and protection method

A technology for protection systems and lithium batteries, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of wasting the number of interfaces, low packaging yield, and increasing costs, and achieve the effect of overcoming the number of interfaces and reducing the number and types of signals

Active Publication Date: 2019-07-26
SHENZHEN FM ELECTRONICS GRP CO LTD
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Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a lithium battery protection system and protection method, wh

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  • Lithium battery protection system and protection method
  • Lithium battery protection system and protection method

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[0041] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0042] Reference figure 1 As shown, an embodiment of the present invention provides a lithium battery protection system. The lithium battery protection system includes (n+1)*m batteries and a protection chip. The protection chip includes a master protection chip and n slave protections. Chip, a main protection chip is coupled to m batteries, each slave protection chip is coupled to a corresponding m battery, the master protection chip is also connected to n slave protection chips, the lithium battery protection system further includes : Detection module, transmission module and judgment module;

[0043] The detection module is ...

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Abstract

The present invention discloses a lithium battery protection system and a protection method thereof. The lithium battery protection system comprises a master protection chip and a plurality of slave protection chips. A detection module is used to trigger an output overvoltage protection signal for the master protection chip or the slave protection chip coupled to the battery when it detects that the cell voltage of a battery exceeds a preset threshold voltage of overvoltage protection within a time range exceeding a set delay time; the master protection chip generates an overvoltage protectionhysteresis signal according to the overvoltage protection signal and transmits it to each slave protection chip through a transmission module; a judgment module is used to judge whether each slave protection chip outputs the overvoltage protection signal; if triggered, the overvoltage protection threshold voltage of the triggered slave protection chip is adjusted to the overvoltage protection hysteresis threshold and all balanced circuits of the m batteries corresponding to the chip are turned on. The effect is as follows: the invention overcomes the defects in the prior art that more interfaces are wasted, the package yield is low and the cost is increased.

Description

Technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a lithium battery protection system and a protection method. Background technique [0002] In high-voltage and high-string applications such as electric bicycles, UPS, and high-power electric tools, lithium batteries have become more and more widely used with the advancement of lithium battery technology and the decline in prices. The demand for higher voltage and greater power means that the number of cells (CELL) in lithium battery packs (PACK) is also increasing. [0003] In the traditional scheme, there has been a lithium battery protection scheme applied to a high number of strings. This scheme mainly adopts the way of external IC cascading, that is, n independent lithium battery protection chips are cascaded with each other to protect high-series lithium batteries. However, this solution has many drawbacks. For example, the large number of peripheral components and lit...

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Application Information

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IPC IPC(8): H02H7/18
CPCH02H7/18
Inventor 董鑫林剑辉
Owner SHENZHEN FM ELECTRONICS GRP CO LTD
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