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Method for evaluating water content of baked lithium ion battery

A post-baking, lithium-ion technology, used in measuring devices, chemical method analysis, electrolyte battery manufacturing, etc., to improve accuracy and solve inauthenticity

Active Publication Date: 2020-08-25
江苏中兴派能电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, it is impossible to test all parts of the cell during the test, and only select a part of a single pole piece for testing, so it is unavoidable that the test moisture value cannot represent the entire cell due to differences in selected points. The actual situation of moisture

Method used

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  • Method for evaluating water content of baked lithium ion battery
  • Method for evaluating water content of baked lithium ion battery
  • Method for evaluating water content of baked lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] S1. Inject 159.3g of electrolyte solution into the baked 523.3g pouch cell, seal and package the cell, and put it in a high-temperature room at 45°C for 48 hours.

[0047] S2. Use a syringe to extract two parts of electrolyte solution from the batteries left in S1, with a mass of 1g and 2g respectively.

[0048] S3, carry out acid-base titration to the electrolytic solution that quality is 1g through the NaOH ethanolic solution that concentration is bromothyme Finland indicator and 0.0001mol / L, bromothyme Finland indicator is the bromothyme Finland that 0.3g is dissolved in 50ml It is made of ethanol, and the content of HF in the electrolyte is 1523ppm by acid-base titration method, and the reacted moisture content in the electrolyte is C H2O It is 1370.7ppm.

[0049] S4, test its unreacted moisture content C with the electrolyte solution that is 2g with the Karl Fischer tester 3 It is 35.2ppm.

[0050] S5. According to the HF content and moisture content in the elec...

Embodiment 2

[0052] S1. Inject 160.2g of electrolyte solution into the baked 520.6g soft pack cell, seal and package the cell, and put it in a high-temperature room at 60°C for 50 hours.

[0053] S2. Use a syringe to extract two parts of electrolyte solution from the batteries left in S1, with a mass of 1g and 2g respectively.

[0054] S3, carry out acid-base titration to the electrolytic solution that quality is 1g through the NaOH ethanolic solution that concentration is bromothyme Finland indicator and 0.0001mol / L, bromothyme Finland indicator is the bromothyme Finland that 0.3g is dissolved in 50ml It is made of ethanol, and the content of HF in the electrolyte is 1685ppm by acid-base titration, and the reacted moisture content in the electrolyte is C H2O It is 1516.5ppm.

[0055] S4, test its unreacted moisture content C with the electrolyte solution that is 2g with the Karl Fischer tester 3 It is 36.6ppm.

[0056] S5. According to the HF content and moisture content in the electro...

Embodiment 3

[0058] S1. Inject 160.6g of electrolyte solution into the baked soft pack cell with a mass of 531.5g, seal and package the cell and put it in a high temperature room at 48°C for 49h.

[0059] S2. Use a syringe to extract two parts of electrolyte solution from the batteries left in S1, with a mass of 1g and 2g respectively.

[0060] S3, carry out acid-base titration to the electrolytic solution that quality is 1g through the NaOH ethanolic solution that concentration is bromothyme Finland indicator and 0.0001mol / L, bromothyme Finland indicator is the bromothyme Finland that 0.3g is dissolved in 50ml It is made of ethanol, and the content of HF in the electrolyte is 1856ppm by acid-base titration method, and the reacted moisture content in the electrolyte is C H2O It is 1670.4ppm.

[0061] S4, test its unreacted moisture content C with the electrolyte solution that is 2g with the Karl Fischer tester 3 It is 48.7ppm.

[0062] S5. According to the HF content and moisture conten...

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Abstract

The invention provides a method for evaluating the water content of a baked lithium ion battery. The method comprises the following steps of S1, injecting electrolyte into a baked soft package batterycell, sealing and packaging the battery cell, and placing the battery cell in a high-temperature room for a certain period of time; S2, extracting two parts of electrolyte from the battery cell shelved in the step S1 by using a needle cylinder; S3, performing acid-base titration of the electrolyte through NaOH ethanol solution and a bromothyme vanilla indicator, and testing the HF content in theelectrolyte; S4, testing the moisture content of the electrolyte by using a Karl Fischer tester; and S5, calculating the moisture content of the baked battery cell according to the HF content and themoisture content in the electrolyte tested in the steps S3 and S4. The method is advantaged in that the moisture content of the whole battery cell after baking is calculated by testing the contents ofHF and the water in the electrolyte after high-temperature shelving, so a problem that a test result is not authentic due to the fact that no representative pole piece is selected is solved, and testaccuracy is improved.

Description

technical field [0001] The invention relates to the technical field of moisture testing of lithium ion batteries, in particular to a method for evaluating the water content of lithium ion batteries after baking. Background technique [0002] With the increasing pressure of resource consumption and environmental protection in our country, there is an urgent need for high-efficiency, energy-saving and environmentally friendly clean energy, and lithium ions, as a high-tech product, have the advantages of high efficiency, greenness, and cleanliness, which provides the possibility for this need . Compared with nickel-cadmium and nickel-metal hydride batteries, lithium-ion batteries have many advantages such as high voltage, large specific energy, long cycle life, good safety performance, small self-discharge, no memory effect, fast charge and discharge, and wide operating temperature range. . In the production process of lithium-ion batteries, moisture is the key process contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16H01M10/058
CPCG01N31/16G01N31/168H01M10/058Y02E60/10Y02P70/50
Inventor 吴德鹏杨庆亨胡学平
Owner 江苏中兴派能电池有限公司