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Lithium ion battery maximum electrolyte injection volume quick evaluation method

A lithium-ion battery and evaluation method technology, which is applied in the field of rapid evaluation of the maximum liquid injection volume of lithium-ion batteries, can solve the problems of complicated and inaccurate parameters, large equipment dependence, and large deviation of liquid injection volume, so as to avoid equipment accuracy and production, avoiding electrical performance degradation, and the effect of accurate design parameters

Active Publication Date: 2017-04-26
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The liquid injection volume of lithium ion battery is an important factor affecting the electrical performance of lithium ion battery. If the electrolyte injection volume is too small, it will cause large internal resistance, poor rate performance and poor cycle performance of the battery; if the electrolyte injection volume is too large, the Will prolong production time and waste electrolyte
Usually, the electrolyte injection volume is selected based on two parameters, one is the empirical injection parameter, the unit is g / Ah, that is, the battery injection volume is obtained by multiplying the battery capacity by the corresponding injection parameter, but this empirical parameter It will vary depending on the material, battery model, and battery manufacturing process. The parameters are complicated and inaccurate, resulting in a large deviation between the calculated liquid injection volume and the actual one.
The second is to verify the maximum liquid injection volume of the battery through actual liquid injection. This method is highly dependent on equipment, and the conclusions drawn are not universal. In addition, debugging the liquid injection machine will consume a lot of time and affect the production progress. At the same time, frequent Adjusting the equipment parameters will also affect the injection accuracy of the equipment

Method used

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Embodiment 1

[0027] A method for rapidly evaluating the maximum liquid injection volume of a lithium-ion battery, comprising the following steps:

[0028] (1) First measure the weight and volume of the positive electrode sheet, then completely soak it in the electrolyte at a temperature of 30°C and leave it sealed for 3 hours. After taking it out, wipe it quickly from the surface with blotting paper once and weigh it immediately; use the positive electrode The ratio of the electrolyte volume that the sheet can hold to its own volume is used to calculate the liquid capacity of the positive electrode sheet α 正 =(m 1 -m 0 ) / ρ / V, where m 1 is the mass of the positive plate after absorbing liquid, m 0 is the mass of the positive electrode sheet before liquid absorption, ρ is the density of the electrolyte, V is the volume of the positive electrode sheet,

[0029] Then calculate the liquid capacity α of the negative plate in the same way 负 and the liquid capacity α of the diaphragm 膜 ;

...

Embodiment 2

[0041] A method for rapidly evaluating the maximum liquid injection volume of a lithium-ion battery, comprising the following steps:

[0042] (1) First measure the weight and volume of the positive electrode sheet, then completely soak it in the electrolyte solution at a temperature of 55°C and leave it sealed for 0.5 hours. After taking it out, wipe it quickly from the surface once with blotting paper and weigh it immediately; The ratio of the electrolyte volume that the sheet can hold to its own volume is used to calculate the liquid capacity of the positive electrode sheet α 正 =(m 1 -m 0 ) / ρ / V=0.08, where the mass of the positive plate after absorbing liquid m 1 =315.3g, the mass of the positive electrode sheet before liquid absorption m 0 =306.6g, electrolyte density ρ=1.2g / cm 3 , positive plate volume V = 94.3cm 3 ,

[0043] Then calculate the liquid capacity α of the negative plate in the same way 负 =0.16 and the liquid capacity of the diaphragm α 膜 =0.59; the sp...

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Abstract

The invention discloses a lithium ion battery maximum electrolyte injection volume quick evaluation method. The electrolyte containing rate of a positive plate, the electrolyte containing rate of a negative plate and the electrolyte containing rate of a diaphragm are measured firstly; the volume of the electrolyte absorbed by each is calculated according to the electrolyte containing rate; the spare volume Vspare of the inner cavity of a battery shell is measured; the correction coefficient eta of the volume of the void for containing the electrolyte of a cathode mix is then detected; and the total electrolyte injection volume m<electrolyte>=( Vspare+Vvoid*eta)*rho of the battery is finally calculated. The evaluation method is simple to operate, the result is accurate, the debugging time is shortened, influences on the device precision and the production by frequent device debugging are avoided, falling of the electric performance of the battery caused by insufficient electrolyte injection volume can be avoided, and accurate design parameters are provided for the electrolyte injection volume of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a method for quickly evaluating the maximum liquid injection volume of lithium ion batteries. Background technique [0002] The liquid injection volume of lithium ion battery is an important factor affecting the electrical performance of lithium ion battery. If the electrolyte injection volume is too small, it will cause large internal resistance, poor rate performance and poor cycle performance of the battery; if the electrolyte injection volume is too large, the It will prolong the production time and waste electrolyte. Usually, the electrolyte injection volume is selected based on two parameters, one is the empirical injection parameter, the unit is g / Ah, that is, the battery injection volume is obtained by multiplying the battery capacity by the corresponding injection parameter, but this empirical parameter It will vary due to different materials, battery models, and ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01G17/04
CPCG01G17/04
Inventor 倪世杰邢军龙张宏立
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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