Lithium battery protection system and protection method

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...

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above problems, the present invention provides a lithium battery protection system and protection method, which solves the defects in the prior art that the number of interfaces is wasted, and the packaging yield is low and the cost is increased.

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