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Battery protection method and system

A technology to protect the system and battery, applied in the direction of battery overcharge protection, battery overdischarge protection, battery disconnect circuit, etc.

Active Publication Date: 2011-11-23
BYD SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the limitation that the existing battery protection method and device only protect the external abnormal conditions of the battery, and provides a battery protection method for protecting the internal abnormal state of the battery and battery protection system

Method used

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  • Battery protection method and system

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with the accompanying drawings.

[0019] Such as figure 2 As shown, the battery protection method provided by the present invention, wherein the battery protection method includes the following steps: determining the charging and discharging state of the battery; obtaining the battery voltage; judging whether the inside of the battery is abnormal according to the charging and discharging state of the battery and the change of the battery voltage State: According to the judgment result of the internal abnormal state of the battery, the on-off of the charging circuit of the battery is controlled.

[0020] Wherein, the method for determining the charging and discharging state of the battery can be any method for judging the charging and discharging state of the battery known to those skilled in the art, preferably by using figure 1 The potential V of the overcurrent detection terminal 101 of the battery...

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Abstract

The invention provides a battery protection method for performing protection according to judgment to the abnormal state inside a battery and a battery protection system for a battery protection device for realizing the method. The battery protection method comprises the following steps: determining the charged state and the discharge state of the battery; obtaining the battery voltage; judging whether the interior of the battery is in normal state or not during the period of charging the battery according to the charged state and the discharge state of the battery and the change of the battery voltage; and controlling the on-off of the charging loop of the battery according to the judged result of the abnormal state inside the battery. The battery protection device comprises a charging and discharging detection module, a battery voltage acquisition module, a logic processing module and a driving module. By adopting the battery protection method and the system, the logical judgment iscarried out on the abnormal state inside the battery, and the on-off of the loop is controlled according to the judgment to the abnormal state inside the battery, therefore, the battery can be protected according to the abnormal state inside the battery.

Description

technical field [0001] The invention relates to a battery protection method and system. Background technique [0002] Due to the characteristics of small size, high energy density, high cycle life, low self-discharge rate and no memory effect, lithium batteries are more and more widely used as the main power supply in mobile phones, notebook computers, digital cameras, electric vehicles and other products. Due to the chemical characteristics of lithium-ion batteries, during normal use, there is a chemical positive reaction in which electric energy and chemical energy are converted internally, but under certain abnormal conditions, especially overcharge, overdischarge and over Current, etc., will lead to chemical side reactions inside the battery, which will seriously affect the performance and service life of the battery after the side reaction is intensified, and may generate a large amount of gas, which will cause the internal pressure of the battery to increase rapidly an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/18H02J7/00G01R31/36
CPCH02J2007/0037H02J7/0031H02J2007/004H02J7/00302H02J7/00306
Inventor 何龙冯卫周军闾建晶
Owner BYD SEMICON CO LTD
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