Protection circuit and method for multiple batteries

Abstract

The invention is applicable to the field of battery protection, and provides a multiple-battery protection circuit and a method thereof. The multiple-battery protection circuit comprises one or a plurality of multiple-battery protection chips, and a charge control switch and a discharge control switch controlled by the multiple-battery protection chips, the multiple-battery protection chips comprise an application protection integrated circuit module for multiple battery packs in series and an expanding connection module, and the input end thereof is connected with the anode pole and the cathode pole of a corresponding single cell, the input end of the chips is connected with the anode and cathode of the corresponding single cell, and the output end thereof is respectively connected with an inner signal input end of the expanding connection module, the expanding signal input end of the expanding connection module is connected with the expanding signal output end of the expanding connection module of the adjacent multiple-battery protection chip, and the output end of the expanding connection module is respectively connected with the charge control switch and the discharge control switch. The multiple-battery protection circuit provided by the technical scheme of the invention can realize the protection of any batteries without any peripheral circuit, which reduces the cost, reduces the complexity of the circuit and improves the testability and the expandability of the circuit.

Description

technical field [0001] The invention belongs to the field of battery protection, in particular to a protection circuit and method for a multi-cell battery. Background technique [0002] When charging the battery, if the charging voltage of the battery exceeds the upper limit of the battery, the battery will be overcharged; when the discharge voltage of the battery drops below the lower limit of the battery, the battery will be overdischarged. Taking lithium-ion battery as an example, if the lithium-ion battery is overcharged, it will cause the internal pressure of the battery to rise, battery deformation, liquid leakage and other adverse phenomena, which may cause the battery to explode or catch fire in severe cases; if the lithium-ion battery is over-discharged, it will cause the battery The increase in internal pressure and the decomposition of the electrolyte degrade the capacity characteristics and durability of the battery cells, resulting in shorter and shorter power s...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a protection circuit for multiple batteries, aiming to solve the problems in the prior art that the protection circuit for more than four batteries has high cost, complex peripheral circuits, and too many external components, which affect system integration and scalability. Problems with sex and poor testability

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