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Method for determining performance of PTC material for lithium-ion batteries

A lithium-ion battery and material performance technology, applied in the direction of measuring electricity, measuring electrical variables, and material electrochemical variables, can solve problems such as battery thermal runaway, battery fire, explosion, etc., achieving high accuracy, fast measurement speed, and improved safety effect

Inactive Publication Date: 2017-07-21
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] There are many safety accidents of lithium-ion batteries, which are caused by the thermal runaway of the battery caused by improper use such as high current, external short circuit, overheating, overcharging, etc., causing the battery to catch fire or even explode.

Method used

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Embodiment Construction

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] A method for measuring the performance of a PTC material for lithium-ion batteries, specifically comprising the steps of:

[0029] 1. Glass transition temperature measurement of PTC materials

[0030] At present, the PTC materials that have application potential in lithium-ion batteries are mainly high molecular polymer materials. When such materials undergo glass transition, they also undergo PTC effects. For lithium-ion batteries, the internal temperature may reach 70°C during use, but when the battery temper...

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Abstract

The invention relates to a method for determining the performance of a PTC material for lithium-ion batteries. The method comprises: 1) measuring the glass transition temperature of a PTC material; 2) measuring the PTC effect generation temperature of a PTC composite electrode; 3) measuring the resistance of the lithium-ion battery of the PTC composite electrode at different temperatures; and 4) detecting the electrochemical performance and the safety performance of the lithium-ion battery of the PTC composite electrode. According to the present invention, by determining the performance of the material, the PTC material for the lithium-ion batteries can be accurately selected so as to improve the safety of the lithium-ion energy storage battery.

Description

technical field [0001] The invention relates to a method for measuring the properties of materials, in particular to a method for measuring the properties of PTC materials used in lithium ion batteries. Background technique [0002] There are many safety accidents of lithium-ion batteries, which are caused by the thermal runaway of the battery caused by improper use such as high current, external short circuit, overheating, overcharging, etc., causing the battery to catch fire or even explode. Improving the safety of lithium-ion batteries in use has always been a major technical issue in the research of lithium-ion batteries. [0003] PTC (Positive Temperature Coefficient) positive temperature coefficient material refers to a heat-sensitive material whose resistance value increases with the increase of temperature, that is, the resistance or resistivity of the material remains basically unchanged or Only minor changes. When the temperature reaches a specific transition poi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01D21/02G01R31/00G01R31/02
CPCG01D21/02G01N27/26G01R31/00G01R31/50
Inventor 范茂松刘道坦徐彬于文海
Owner CHINA ELECTRIC POWER RES INST
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