An overcurrent protection method and circuit for a battery cell

Abstract

The present application provides a battery cell overcurrent protection method and protection circuit. The method includes: detecting the current temperature value of the battery cell; judging whether the current temperature value is greater than the minimum temperature threshold and less than the maximum temperature threshold; When the minimum temperature threshold is less than the maximum temperature threshold, determine the temperature range to which the current temperature value of the battery cell belongs; detect the current current value of the battery; determine whether the current current value of the battery is greater than the current threshold corresponding to the temperature range to which the current temperature value belongs ; When the current current value of the battery is greater than the current threshold corresponding to the temperature range to which the current temperature value belongs, control the charging and discharging module to shut down. The overcurrent protection method and protection circuit provided by this application replace the TCO safety protection method in the prior art, which reduces the cost, reduces the internal resistance of the battery, reduces energy loss, and improves the accuracy of the overcurrent protection of the battery cell. .

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to an overcurrent protection method and circuit for battery cells. Background technique [0002] Currently, notebook battery cells use TCO breaker (Thermal Cut Off breaker, thermal fuse) for over-temperature / over-current protection. At a certain ambient temperature, when the charging and discharging current of the battery cell is greater than the set threshold, the TCObreaker triggers the protection and disconnects (because the heat accumulation of the TCO breaker exceeds the threshold and the bimetal strip reverses and bounces off), when the TCO temperature drops to At a certain temperature, the TCO breaker turns on again. The function of the TCO breaker is equivalent to the over-temperature and over-current protection of the battery cell. It allows a large current to charge and discharge at low temperature, and only allows a small current to charge and discharge at high tempera...

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a battery cell overcurrent protection method and circuit to solve the problem of high cost, power loss and overcurrent protection in the prior art using TCO breaker for overtemperature / overcurrent protection. To protect the problem of low precision, the technical solution is as follows:

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