An electric vehicle battery protection device

Abstract

The invention discloses an electromobile cell protection device, comprising a central processing unit, single cell voltage input interfaces, a single cell voltage collection circuit and a plurality of voltage balancing circuits, wherein the voltage balancing circuits are corresponding to single cells in an electromobile cell one by one, each voltage balancing circuit is connected to the corresponding single cell in series to form a loop, each voltage balancing circuit comprises a switch tube and a power resistor which are connected with the corresponding single cell in series to form a loop, the control end of each switch tube is electrically connected to the central processing unit, each single cell is electrically connected to the single cell voltage collection circuit through the corresponding single cell voltage input interface, and the single cell voltage collection circuit is electrically connected to the central processing unit. The electromobile cell protection device has the function of dynamic balancing, can regulate voltage pressure among the single cells, in real time and ensure voltage consistency of the single cells, and prolongs the service life of the electromobile cell.

Description

technical field [0001] The invention relates to the technical field of electric vehicle batteries, in particular to an electric vehicle battery protection device. Background technique [0002] In order to prevent the power battery of the electric vehicle from overcharging or short circuiting, the power battery is usually equipped with a charging and discharging protection circuit, so that the power battery will stop charging or discharging after charging or discharging to a certain voltage threshold, so as to ensure the safety of the power battery , At the same time, in order to improve the consistency of the battery pack, the protection circuit also has the function of equalizing the voltage of the battery pack, which ensures that the service life of the battery pack can be extended to a certain extent. However, the current equalization mode of the battery pack protection system is static equalization, that is, the equalization can only be turned on after the cell voltage i...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the technology that the existing electric vehicle battery protection device only balances the voltage difference between the single cells after the voltage of the single cells is charged to the balanced opening voltage during the charging process of the battery pack, and the voltage consistency of the single cells is not good. The problem is to provide an electric vehicle battery protection device, which has a dynamic equalization function, can adjust the voltage difference between the single cells in real time, ensures the consistency of the single battery voltage, and prolongs the service life of the electric vehicle battery

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