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Short-circuit resistance test method

A test method and short-circuit resistance technology, which can be applied to circuits, measuring electricity, measuring devices, etc., can solve problems such as explosion and battery thermal runaway, and achieve high data accuracy, accurate measurement, and good consistency.

Inactive Publication Date: 2018-02-23
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the heat dissipation rate of the battery is lower than the heat generation rate, it may cause safety problems such as thermal runaway and explosion of the battery

Method used

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Experimental program
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Effect test

Embodiment

[0022] The 38Ah battery is fully charged to obtain a fully charged battery, which is disassembled in a dry room to obtain four types of electrodes: aluminum foil, copper foil, negative electrode, and positive electrode. Use a mold to punch the above-mentioned pole piece into a square sheet of 41mm*30mm, weld the tabs to the four pole pieces respectively, and then follow the four types of copper foil-aluminum foil, negative pole-aluminum foil, positive pole-negative pole, positive pole-copper foil The models are assembled into soft-pack batteries respectively. The shell of the soft-pack batteries is made of aluminum-plastic film with a thickness of 86 microns, and no electrolyte is added. The soft-pack batteries are packaged for testing. A specific fixture should be installed when testing the battery, because the battery only contains two pole pieces, if the fixture is not installed, it will cause poor contact between the pole pieces, resulting in a large contact resistance, whi...

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Abstract

The invention discloses a short-circuit resistance test method. The method comprises the steps that a full-charge battery is disassembled to acquire various kinds of pole pieces in different short-circuit modes; each pole piece is made into a square piece of 41 mm*30 mm; the pole pieces are assembled into a soft pack battery in different short-circuit modes; electrolyte is not needed; an electrochemical workstation is used to test the impedance of the battery; and the measured ohmic resistance is the short-circuit resistance of the battery. The short-circuit resistance of four short-circuit modes is tested to prove the usability and rationality of the method. The test method provided by the invention is simple and reliable, has the advantages of high data accuracy and good consistency, canaccurately measure the short-circuit resistance or other types of resistance, and has a great application prospect in the field of the study of battery safety mechanisms.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a short-circuit resistance testing method. Background technique [0002] Lithium-ion batteries have the advantages of high voltage and energy density, long cycle life, high energy efficiency, no memory effect, and less environmental pollution. With the widespread application of lithium-ion batteries, the safety of batteries has received more and more attention. Judging from some previous mobile phone explosion incidents, the spontaneous combustion or explosion of mobile phones was mostly caused by internal short circuits. This type of battery is mainly due to defects in the design or production process of the battery, which cause the battery to spontaneously ignite or explode. [0003] The main reason for the combustion of lithium-ion batteries is that batteries now generally use flammable alkyl carbonate organic solutions as the electrolyte. When the negative ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/0525
CPCG01R31/378G01R31/389G01R31/396H01M10/0525Y02E60/10
Inventor 鲁扬
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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