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Lithium polymer battery and preparation method thereof

A lithium polymer battery and cell technology, applied in secondary batteries, battery components, circuits, etc., can solve problems such as aluminum-plastic film corrosion, potential safety hazards, battery inflation, etc., to improve tightness and prevent gaps Or poor contact, the effect of improving stability

Pending Publication Date: 2022-03-25
MEIZHOU LIANGNENG NEW ENERGY SCI & TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Lithium polymer batteries include polymer materials and aluminum-plastic films. Damage to the aluminum-plastic film will cause the middle aluminum layer to contact the negative electrode and electrolyte, thereby forming ion channels and electronic channels, resulting in internal corrosion of the aluminum-plastic film.
Corrosion in the aluminum-plastic film will cause the battery to swell, leak, and cause a series of safety hazards

Method used

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  • Lithium polymer battery and preparation method thereof
  • Lithium polymer battery and preparation method thereof
  • Lithium polymer battery and preparation method thereof

Examples

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preparation example Construction

[0039] The present application provides a preparation method of a lithium polymer battery. The preparation method of the above-mentioned lithium polymer battery includes the following steps: putting the diaphragm into molten hot melt adhesive for infiltration operation to obtain a reinforced diaphragm; attaching the positive electrode sheet and the negative electrode sheet to both sides of the reinforced diaphragm respectively to obtain a roll chip; performing lug welding operation on the roll chip to obtain the roll chip to be wound; performing winding operation on the roll chip to obtain the roll core body; performing hot pressing operation on the roll core body to obtain An integrated battery cell; the integrated battery cell is put into an aluminum-plastic sleeve, injected with an electrolyte, and then packaged to obtain the lithium polymer battery.

[0040] In the preparation method of the above-mentioned lithium polymer battery, the separator is put into the molten hot m...

Embodiment 1

[0063] Put the hot melt adhesive in the molten state in the reactor, add 0.05 parts by mass of foaming agent, put the diaphragm into the molten hot melt adhesive for infiltration operation, and then take it out to obtain a reinforced diaphragm. The surface of the diaphragm is attached with a release film. While tearing off the release film, attach the prepared positive electrode sheet to one side of the reinforced separator, and attach the prepared negative electrode sheet to the side of the reinforced separator that is away from the positive electrode sheet to form a roll Winding roll chips. Then put the winding chip to be wound into the winding machine for winding operation, so that the separator, positive electrode sheet and negative electrode sheet are wound to form a single winding core; the winding core body is subjected to hot pressing operation to obtain an integrated battery core, in which the heat The pressing temperature is 100°C, and the hot pressing pressure is 0...

Embodiment 2

[0065] Put the molten hot melt adhesive in the reaction kettle, add 0.2 parts by mass of foaming agent, put the diaphragm into the molten hot melt adhesive for infiltration operation, and then take it out to obtain a reinforced diaphragm, and strengthen it The surface of the diaphragm is attached with a release film. While tearing off the release film, attach the prepared positive electrode sheet to one side of the reinforced separator, and attach the prepared negative electrode sheet to the side of the reinforced separator that is away from the positive electrode sheet to form a roll Winding roll chips. Then put the winding chip to be wound into the winding machine for winding operation, so that the separator, positive electrode sheet and negative electrode sheet are wound to form a single winding core; the winding core body is subjected to hot pressing operation to obtain an integrated battery core, in which the heat The pressing temperature is 150°C, and the hot pressing p...

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Abstract

The invention provides a lithium polymer battery and a preparation method thereof. The preparation method of the lithium polymer battery comprises the following steps: putting the diaphragm into a molten hot melt adhesive for infiltration operation to obtain the reinforced diaphragm, so that the problems of internal corrosion and expansion of the lithium polymer battery are effectively prevented, and the safety performance of the lithium polymer battery is improved; respectively attaching the positive plate and the negative plate to the two surfaces of the reinforced diaphragm to obtain a roll chip; carrying out tab welding operation on the roll chip to obtain a to-be-wound roll chip; winding the to-be-wound roll core sheet to obtain a roll core body; carrying out hot pressing operation on the roll core body to obtain an integrated battery core; and loading the integrated battery cell into an aluminum plastic sleeve, injecting an electrolyte, and then carrying out packaging operation to obtain the lithium polymer battery, so that the structural stability and safety of the lithium polymer battery cell are further improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a lithium polymer battery and a preparation method thereof. Background technique [0002] Lithium polymer batteries use solid polymer electrolytes instead of liquid electrolytes. This polymer can be "dry" or "colloidal". At present, most of them use polymer gel electrolytes. Lithium polymer batteries have Good shaping flexibility, high volume utilization, etc., so the sales of lithium polymer batteries have been rising, and the production pressure of lithium polymer batteries has also been increasing, especially for the transportation and production applications of lithium polymer batteries. The conditions are higher. [0003] Lithium polymer batteries include polymer materials and aluminum-plastic films. Damage to the aluminum-plastic film will cause the intermediate aluminum layer to contact the negative electrode and electrolyte, thereby forming ion channels and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/0525H01M50/403H01M50/449H01M50/494H01M50/46
CPCH01M10/0587H01M10/0525H01M50/403H01M50/449H01M50/494H01M50/461Y02E60/10Y02P70/50
Inventor 余海导王守军余育强刘新华
Owner MEIZHOU LIANGNENG NEW ENERGY SCI & TECHCO
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