Method for manufacturing square-round core aluminum-plastic membrane lithium ion battery for evaluating

A lithium ion battery and a manufacturing method technology are applied in the manufacturing field of square-round core aluminum-plastic film lithium ion batteries for evaluation, which can solve problems such as poor data consistency, electrolyte leakage, battery bulging, etc., and achieve uniform current density distribution, High reliability and good consistency

Active Publication Date: 2014-03-26
贵州芭田新能源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] If it is made into a cylindrical steel-cased battery or a cylindrical aluminum-cased battery, one needs to accurately calculate the assembly ratio of the winding core, otherwise the battery may not be produced or the performance of the battery may be unstable
However, due to the fact that the tested materials are still in the research and development stage, there are often certain uncertainties, which makes it almost impossible to accurately calculate the assembly ratio of the winding core. Therefore, it is necessary to explore many times until a suitable assembly ratio is found to effectively evaluate the functional properties of the material. ; Second, more equipment needs to be invested, and the investment is relatively large; it requires rich experience in the operation of large equipment, which is not easy for personnel specialized in material research and development; third, if more gas is released during material testing, it will make the battery cover safe. Valve opens to terminate subsequent tests
[0005] If it is made into a square steel shell (or aluminum shell, plastic shell) battery, it will be difficult to control the assembly ratio, the assembly pressure is difficult to control, and the data consistency is poor. When encountering a large amount of gas released during material testing, the battery will bulge. Unable to proceed with follow-up testing
[0006] If it is made into a polymer prismatic battery, although the assembly ratio problem is solved, the battery will bulge due to the release of a lot of gas during the material test, and the electrolyte will leak seriously, making it impossible to continue the follow-up test.
[0007] If a cylindrical aluminum-plastic film battery structure is used, such as patent 200510126420.5 cylindrical aluminum-plastic composite film soft-packaged lithium-ion battery, patent 200520136509.5 cylindrical aluminum-plastic composite film soft-packaged lithium-ion battery and patent 200920026097.8 a cylindrical aluminum-plastic composite film soft-packaged lithium-ion battery. The cylindrical aluminum-plastic film battery can better solve the problem of assembly ratio and electrode material release gas, but the adjustment of electrolyte and the collection of battery release gas cannot be realized conveniently, so it cannot meet the requirements of material function evaluation. Require

Method used

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  • Method for manufacturing square-round core aluminum-plastic membrane lithium ion battery for evaluating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Positive sheet production: LiFePO 4 , KS, SP, and PVDF are made into a slurry with a solid content of 50% in a ratio of 90:2:2:6, and the surface density is 300g / m2 on a coating machine 2 After drying the pole piece at 110°C for 15 hours, take out the pole piece cut into 50×700mm, and roll it on the roller machine to form a compacted density of 2.20 g / m 3 The pole piece is ultrasonically welded on one end of the pole piece with an aluminum lug.

[0023] Negative sheet production: FSN, SP, CMC, and SBR are made into a slurry with a solid content of 40% in a ratio of 95:1:2:2, and the surface density is 150g / m on a coating machine 2 After drying the pole piece at 110°C for 15 hours, take out the pole piece cut into 57×800mm, and roll it on the roller machine to form a compacted density of 1.60g / m 3 The pole piece is spot-welded with a nickel lug at one end of the pole piece.

[0024] Place the PE separator (25μm thick, 60mm wide), negative electrode, separator, and pos...

Embodiment 2

[0027] The preparation method of the positive electrode sheet is the same as in Example 1, and the compacted density is 2.10 g / m 3 , Pole size 50 × 500mm.

[0028] The manufacturing method of the negative electrode sheet is the same as in Example 1, and the size of the electrode sheet is 57×550mm.

[0029] The winding is the same as in Example 1, and the battery-grade aluminum-plastic composite film is cut into a size of 10×16cm, packaged and dried according to the same method as in Example 1, and then moved into an environment with a relative humidity of ≤2%, and inject 1mol through the liquid injection port / L LiBOB in the EC:DMC:EMC:PC mass ratio of 3:1:1:1 electrolyte 10ml immerse the winding core, seal it, and get a 10×8cm square-round core aluminum-plastic film battery.

Embodiment 3

[0031] The preparation method of the positive electrode sheet is the same as in Example 1, and the compacted density is 2.40 g / m 3 , Pole size 50 × 500mm.

[0032] The manufacturing method of the negative electrode sheet is the same as in Example 1, and the size of the electrode sheet is 57×550mm.

[0033] Place the diaphragm, negative electrode sheet, 25μm PP, PE composite diaphragm, and positive electrode sheet in order from bottom to top. Φ A 4mm needle is wound into a core, then wrapped and fixed with adhesive tape, a 11×22cm aluminum-plastic composite film is cut, packaged and dried as in Example 1, then moved into an environment with a relative humidity of ≤2%, and injected through the liquid injection port 1mol / L LiBF 4 In the AN:DEC:EMC:GBL mass ratio of 5:1:1:1 electrolyte 10ml submerged core, sealed, to get a 11 × 11cm square - round core aluminum-plastic film battery.

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Abstract

The invention discloses a method for manufacturing a square-round core aluminum-plastic membrane lithium ion battery for evaluating. An anode and a cathode prepared by a general method according of a lithium ion battery, then are coiled to form a round core, and are sealed into a square battery-grade aluminum plastic membrane bag, and an air chamber is reserved. The structural design avoids defects that a current battery structure is not easy to control an assembling ratio and assembling pressure when evaluating an electrode material and the material is not continuously tested because of bulge and leakage of the battery caused by gas generation, has performance suitable for evaluating various materials under different technologies, and has characteristics of low investment equipment cost.

Description

technical field [0001] The invention discloses a manufacturing method of a square-round aluminum-plastic film lithium-ion battery for evaluation, which belongs to the innovation of material evaluation technology of chemical energy storage technology. Background technique [0002] Lithium-ion batteries have been developing rapidly since their introduction in the 1990s. The innovation of new lithium-ion battery electrode materials has promoted the continuous improvement of lithium-ion battery performance. The evaluation of the functional properties of materials is an important link in the material development process. However, evaluating whether the function of a new material meets the requirements of practical applications is a time-consuming and labor-intensive task. [0003] Usually, the method of evaluating the functional characteristics of electrode materials is to make the electrode materials into actual batteries, and then test the performance of the batteries to refl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01M10/0587
CPCH01M10/0525H01M10/058H01M10/0587H01M50/409Y02E60/10Y02P70/50
Inventor 郝德利叶丽光
Owner 贵州芭田新能源材料有限公司
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