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Battery safety identification method, internal short circuit hazard level setting method and warning system

A hazard level, battery technology, applied in the direction of battery disconnection circuit, battery circuit device, safety/protection circuit, etc., can solve the problems that the internal short circuit energy cannot be quantified, and there is no safety identification method

Active Publication Date: 2022-07-08
IND TECH RES INST
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Generally, acupuncture damages the battery and generates a large short-circuit energy. However, in many cases, thermal runaway caused by short-circuit in the battery is caused by the continuous accumulation of many abnormal micro-short circuits. It is impossible to quantify the internal short-circuit energy that causes thermal abnormalities without a more accurate safety identification method

Method used

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  • Battery safety identification method, internal short circuit hazard level setting method and warning system
  • Battery safety identification method, internal short circuit hazard level setting method and warning system
  • Battery safety identification method, internal short circuit hazard level setting method and warning system

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[0035] The following examples are provided for detailed description, and the examples are only used as examples to illustrate, and are not used to limit the scope of protection of the present invention. In the following, the same / similar symbols represent the same / similar components for explanation.

[0036] According to an embodiment of the present invention, a battery safety identification method and judgment method are provided, which can set the hazard level when the battery is abnormal according to abnormal signals generated by parameters such as voltage, current, and temperature of the battery. The abnormal signal is, for example, a short-term voltage drop. When the voltage drop of the battery is not caused by the normal charge and discharge current, it is an abnormal voltage drop. The larger the abnormal voltage drop, the greater the instantaneous short-circuit current. In addition, the abnormal signal is, for example, abnormal voltage drop time or abnormal recovery spe...

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Abstract

A safety identification method for a battery includes the following steps. A voltage drop and a voltage drop change rate when a battery is abnormal are detected. A voltage drop duration and a voltage recovery ratio are detected when the battery is abnormal. Detect a surface temperature or a temperature rise change when the battery is abnormal. According to the voltage drop, the rate of change of the voltage drop, the voltage recovery ratio, and the surface temperature or temperature rise change, multiple hazard levels and at least one protection mechanism for battery abnormality are set.

Description

technical field [0001] The present invention relates to a method for detecting a short circuit in a battery, and more particularly, to a method for identifying the safety of a battery, a method for setting the hazard level of a short circuit in the battery, and a warning system using the same. Background technique [0002] Internal short circuit is the main cause of thermal runaway of lithium-ion batteries. After the internal short circuit occurs, the current accumulates at the internal short circuit point, generating a large amount of heat, leading to local high temperature, and finally even causing thermal runaway. At present, the detection of short circuit in the battery is mainly performed by acupuncture experiments with stainless steel needles to simulate the short circuit in the battery, so as to observe whether the battery is thermally abnormal. Usually, acupuncture damages the battery and generates a large amount of short-circuit energy. However, in general, thermal...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/3835G01R31/389
CPCG01R31/3835G01R31/389H01M10/486G01R31/3646G01R31/367H01M10/425H01M10/443H01M10/613H01M10/633H01M2010/4271H02J7/0031H01M2200/00H02J7/00309H02J7/007194G01R31/374G08B21/185
Inventor 孙建中周俊宏谢登存朱哲纬
Owner IND TECH RES INST