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Method for testing gas expansion rate of lithium-ion battery in charging and discharging process

A lithium-ion battery, charge and discharge process technology, applied to the analysis of materials, instruments, etc., can solve the problems of no relevant reports, generation of flatulence, difficult flatulence rate, etc.

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

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Problems solved by technology

[0002] At present, lithium-ion batteries often have flatulence during charging and discharging. There are many reasons for flatulence. The electrolyte membrane will also appear flatulence; when the pre-filling and formation are not complete, flatulence will also occur
The flatulence of the battery during charging and discharging is the most common. The first step in researching the flatulence battery is to test the flatulence rate, and testing the flatulence rate of the battery during the charging and discharging process plays a very important role. How to test the real-time flatulence rate has become a difficult point. And there is no relevant report in the prior art

Method used

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  • Method for testing gas expansion rate of lithium-ion battery in charging and discharging process
  • Method for testing gas expansion rate of lithium-ion battery in charging and discharging process
  • Method for testing gas expansion rate of lithium-ion battery in charging and discharging process

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Embodiment 1

[0021] A method for testing the flatulence rate of a lithium-ion battery during charging and discharging, said method comprising the steps of:

[0022] S1. Connect the lithium-ion soft pack battery to the bottom of the electronic balance (refer to figure 1 ), record the mass of the lithium-ion pouch battery as m 1 ;

[0023] S2. Put the lithium-ion soft-pack battery in a 1L beaker, add cooking oil to the lower end of the lithium-ion soft-pack battery tab (refer to figure 2 ), weigh the mass of the lithium-ion pouch battery, and record it as m 2 ;

[0024] S3. According to Archimedes' principle, the buoyancy F 浮 =solvent density (ρ)*gravitational acceleration (g)*volume of lithium-ion pouch battery; among them, F 浮 =(m 1 -m 2 )*g, to obtain the volume of the lithium-ion soft pack battery, recorded as V 1 ;

[0025] S4, connect the soaked lithium-ion pouch battery to the battery performance test system, and set the charging and discharging steps (refer to image 3 ), ...

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Abstract

The invention discloses a method for testing the gas expansion rate of a lithium-ion battery in the charging and discharging process. The method comprises the steps of 1, measuring the mass of the lithium-ion battery, and recording the mass as m1; 2, placing the lithium-ion battery in a solvent for soaking, measuring the mass of the soaked lithium-ion battery, and recording the mass as m2; 3, according to the Archimedes principle, obtaining the volume of the lithium-ion battery, and recording the volume as V1; 4, connecting the soaked lithium-ion battery to a battery performance test system, setting charging and discharging working steps, obtaining a gas-expanded lithium-ion battery after the mass of the lithium-ion battery gets smaller, and recording the mass of the gas-expanded lithium-ion battery at any time period as n1, obtaining the volume of the gas-expanded lithium-ion battery according to the Archimedes principle, and recording the volume as V2; 5, conducting calculation according to the formula that the gas expansion rate = (V2-V1) / V1*100%. By means of the method, the gas expansion rate of the lithium-ion soft-packed battery in the charging and discharging process can bemonitored in real time.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for testing the inflation rate of lithium ion batteries during charging and discharging. Background technique [0002] At present, lithium-ion batteries often have flatulence during charging and discharging. There are many reasons for flatulence. The electrolyte membrane will also appear flatulence; when the pre-filling and formation are not complete, flatulence will also occur. The flatulence of the battery during charging and discharging is the most common. The first step in researching the flatulence battery is to test the flatulence rate, and testing the flatulence rate of the battery during the charging and discharging process plays a very important role. How to test the real-time flatulence rate has become a difficult point. And there is no relevant report in the prior art. Contents of the invention [0003] Based on the technical problems existing in the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N7/14
CPCG01N7/14
Inventor 方婷婷王亚平
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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