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1. (WO2018099324) POWER BATTERY OVERCHARGE PROTECTION CIRCUIT AND DEVICE, AND BATTERY MANAGEMENT SYSTEM

Pub. No.:    WO/2018/099324    International Application No.:    PCT/CN2017/112800
Publication Date: Fri Jun 08 01:59:59 CEST 2018 International Filing Date: Sat Nov 25 00:59:59 CET 2017
IPC: H02H 7/18
H02J 7/00
Applicants: BYD COMPANY LIMITED
比亚迪股份有限公司
Inventors: XIE, Zhefeng
谢哲锋
CHEN, Wu
陈武
JIANG, Buhong
蒋步洪
Title: POWER BATTERY OVERCHARGE PROTECTION CIRCUIT AND DEVICE, AND BATTERY MANAGEMENT SYSTEM
Abstract:
A power battery overcharge protection circuit and device, and a battery management system. The overcharge protection circuit comprises: a voltage detection circuit (10), used for detecting the voltage of a power battery; a temperature compensation circuit (20), separately connected to the voltage detection circuit and the power battery and used for carrying out temperature compensation on voltage detection circuit; a control circuit (30), connected to an output end of the voltage detection circuit and used for controlling a charging control loop to enter a disconnected state when the voltage of the power battery is greater than a preset voltage threshold, for implementing overcharge protection on the power battery. The circuit is able to directly control an operation of a charging control loop when the voltage of a power battery is greater than a preset voltage threshold, without involving software logical determination, and can also compensate a temperature drift of the voltage detection circuit by means of the temperature compensation circuit, thereby improving the speediness, accuracy, and reliability of overcharge protection.