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Polymer lithium ion battery and production method thereof

A lithium-ion battery and a manufacturing method technology, applied in the field of lithium-ion batteries, can solve the problems of tearing, battery electrochemical performance deterioration, battery appearance dirty and scrapped, etc. Edge sealing, air tightness, no pollution, bad effect

Pending Publication Date: 2019-02-22
北京环宇东方聚能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer batteries can be used and stored for a long time, and there will be no gas swelling caused by chemical reactions inside the battery due to the penetration of water vapor in the environment. However, for large-capacity polymer lithium-ion batteries, due to their large size and heavy weight, single After being packaged with aluminum-plastic composite film, the middle aluminum-plastic film is prone to tearing, corner cracking and other undesirable phenomena, resulting in corrosion of the aluminum foil, and the battery is bloated due to water vapor penetration, which has caused great problems for the use of polymer lithium-ion batteries. Poor hidden dangers, including poor safety performance, shortened service life, etc.
In addition, the production process of the traditional polymer lithium-ion battery leaves the airbag port to exhaust, and the final edge sealing
Large-capacity batteries have a large amount of liquid injection, and the electrolyte cannot be absorbed immediately. The unabsorbed electrolyte will pollute the unsealed edge of the air bag opening, so that the unsealed edge will not be firmly sealed due to electrolyte contamination residues when it is finally sealed. , the air tightness is reduced, and after the battery is stored for a long time, it will be infiltrated by water vapor and absorb water and swell, resulting in poor electrochemical performance of the battery, shortened service life, etc., and may even cause safety accidents; or the overflowing electrolyte may pollute the aluminum-plastic compound on the outside of the battery The film layer makes the appearance of the battery dirty and scrapped

Method used

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  • Polymer lithium ion battery and production method thereof
  • Polymer lithium ion battery and production method thereof
  • Polymer lithium ion battery and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Preparation of positive electrode sheet: layered transition metal oxide lithium salt LiMO 2 (M=Co, Ni, Mn, etc. or their multiple combination complexes) such as LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 or LiFePO 4 It is the positive electrode active material, its ratio is 95% of the powder content, polyvinylidene fluoride is used as the binder, the content is 2.5%, the conductive agent is carbon nanotube and carbon black content is 2.5%, the above materials are added to N - Stir evenly in methylpyrrolidone (NMP) to make a slurry, evenly coat the positive electrode slurry on the positive electrode current collector aluminum foil with carbon powder, dry and compact it, and cut it into the size specified by the process, Obtain the positive pole piece.

[0054] The preparation of negative plate: take artificial graphite as negative active material, its ratio is 95% of powder content, with styrene-butadiene rubber (SBR) as binding agent, its content is 2%, sodium carboxymethyl cellul...

Embodiment 2

[0060] The difference from Example 1 is; the preparation of large-capacity polymer lithium-ion batteries: the positive electrode of the battery cell is ultrasonically or laser welded with a positive ear with ear glue, and the negative electrode is ultrasonically or laser welded with an ear. For the negative electrode tab of the glue, the battery core is packaged with a material of 0.1mm polyethylene (PE) in the inner layer for the first packaging. The packaging temperature is 140°C, the pressure is 0.3MPa, and the time is 1 second. The relative humidity is ≤1%, and the dew point is -60°C; the once-packaged cell is baked to remove moisture and then injected with electrolyte, and after chemical formation, secondary sealing and other processes and shaping, the finished cell is top-sealed Fold the tabs together to form a square shape, and extend the positive and negative tabs, weld the positive tabs and negative tabs with tab glue with ultrasonic or laser, and put them into the alu...

Embodiment 3

[0063] The difference from Example 1 is; the preparation of large-capacity polymer lithium ion battery: the positive electrode ear with ear glue on the positive electrode of the obtained battery cell is ultrasonically or laser welded, and the negative electrode is welded with ear glue on the negative electrode The negative electrode tab of the battery packs the battery core with a material of 0.1mm cast polypropylene film (CPP) on the inner layer for the first packaging. The packaging temperature is 175°C, the pressure is 0.3MPa, and the time is 2 seconds. , the relative humidity is ≤1%, and the dew point is -60°C; the once-packaged cell is baked to remove moisture and then injected with electrolyte, and after chemical formation, secondary sealing and other processes and shaping, the finished cell is topped The seal is folded up into a square shape together with the tabs, and the positive tab and the negative tab are extended, and the positive tab and the negative tab with tab ...

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Abstract

The invention relates to a polymer lithium ion battery and a production method thereof. The polymer lithium ion battery provided by the invention comprises a battery cell and at least one layer of inner-layer packaging film and at least one layer of outer-layer packaging film coating the battery cell, wherein the inner-layer packaging film is a plastic film or a plastic composite film, and the outer-layer packaging film is an aluminum plastic composite film. The polymer lithium ion battery provided by the invention has better airtightness and appearance effect, and performances of the batteryare better guaranteed. By using the production method provided by the invention, it can be ensured that the edge sealing airtightness of an outer layer of a battery package is qualified and appearancepollution or poor appearance does not exist, and it is ensured that the battery has no performance deterioration caused by poor packaging.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a polymer lithium ion battery and a manufacturing method thereof. Background technique [0002] With the increasing depletion of traditional oil resources and the increasing threat to human beings of climate problems characterized by global warming, new energy sources are gradually being applied to people's lives. Energy-saving and environmentally friendly new energy electric vehicles are increasingly becoming one of the best choices for people to travel. As one of the key components of new energy electric vehicles, power batteries require higher energy density, safer performance and longer service life to meet people's experience. Enlarging the battery capacity is to increase the energy density of a single battery one of the effective ways. According to the structural classification of batteries, lithium-ion batteries can be divided into square alumin...

Claims

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Application Information

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IPC IPC(8): H01M2/02H01M10/0525H01M10/058H01M50/116H01M50/124
CPCH01M10/0525H01M10/058H01M2220/20H01M50/116H01M50/124Y02E60/10Y02P70/50
Inventor 余嘉
Owner 北京环宇东方聚能科技有限公司
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