Wound lithium ion battery and preparation method thereof

A lithium-ion battery, battery positive electrode technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as cell installation size interference, cell voids, safety accidents, etc., to achieve easy removal of materials and cheap , solve the effect of deformation and arching, and rapid industrialization

Pending Publication Date: 2022-01-04
福建省致格新能源电池科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This abnormality is likely to interfere with the installation size of the battery cell, affect the performance of the battery cell, and even cause a safety accident
[0003] At present, the semi-automatic winding production process adopts the method of inserting special-shaped insulating sheets during the winding process, pulling them out manually after winding, and inserting 1-5 special-shaped insulating sheets according to the actual situation. This process can solve the arching deformation of the battery core, but it brings There is a large hole in the part of the special-shaped insulating sheet that is pulled out. This hole is generally reflected in the turning point of the battery cell. There are abnormal phenomena that the positive and negative electrodes are not in close contact and the electrolyte is insufficient. During the recycling process, lithium deposition is easy to occur at this place. There are serious security risks
[0004] There are currently three temporary solutions to this problem in the automatic winding process: one is to draw on the technical route of the semi-automatic winding and inserting operation, and do the inserting process on the winding needle of the automatic winding machine, so that the cells produced in this way There is still a void

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Stir and dissolve ethylene carbonate and ethanol according to the mass ratio of 1:10 to form an easy-to-remove substance solution, and use a micro-gravure coating process to coat a 120um thick battery positive electrode sheet with a coating thickness of 10um and a coating quality of 10g / m 2 Easy-to-remove material solution, the coated battery positive plate, battery negative plate and PE film are subjected to battery winding process, the thickness of the battery negative plate is 120um, and the thickness of the PE film is 16um; the wound battery pack Put the turnover box into the turnover box, and then put the turnover box into the vacuum drying oven to vacuumize and dry to remove easily removed substances. The vacuum drying parameters: vacuum degree 1000Pa, temperature: 50°C, time: 36h.

Embodiment 2

[0025] Stir and dissolve naphthalene and ethanol at a mass ratio of 1:5 to form an easy-to-remove substance solution, and use a micro-gravure coating process to coat a battery negative electrode sheet with a thickness of 140um. The coating thickness is 5um and the coating quality is 5g / m 2 The easy-to-remove substance solution, the coated battery negative electrode sheet, battery positive electrode sheet and aluminum oxide-coated PE film are subjected to battery winding process. The thickness of the battery positive electrode sheet is 145um, and the thickness of the aluminum oxide-coated PE film is 20um; put the wound battery into the turnover box, then put the turnover box into a vacuum drying oven to vacuum dry to remove easily removed substances, vacuum drying parameters: vacuum degree 1Pa, temperature: 130°C, time: 1h.

Embodiment 3

[0027] Stir and dissolve the biphenyl and ethanol according to the mass ratio of 1:3 to form an easy-to-remove substance solution, and use a micro-gravure coating process to coat a PP and PE composite film with a thickness of 25um. The coating thickness is 4um and the coating quality 3g / m 2 Easy-to-remove substance solution, the coated PP and PE composite film and the positive electrode sheet of the battery and the negative electrode sheet of the battery are subjected to the battery winding process. The thickness of the positive electrode sheet of the battery is 100um, and the thickness of the negative electrode sheet of the battery is 120um; Put the cells into the turnover box, and then put the turnover box into the vacuum drying oven to vacuumize and dry to remove easily removed substances. The vacuum drying parameters: vacuum degree 500Pa, temperature: 80°C, time: 24h.

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Abstract

The invention discloses a preparation method of a wound lithium ion battery. The method comprises the following steps of: coating at least one of a battery positive electrode sheet, a battery negative electrode sheet and a diaphragm with an easy-to-remove substance solution, and removing the easy-to-remove substance after winding. The invention further discloses the wound lithium ion battery prepared according to the preparation method, wherein the internal expansion space of the battery can be reserved in the wound lithium ion battery, so that deformation and arching of the battery are controlled, and deformation and arching in the battery manufacturing and using process are solved. According to the invention, the easy-to-remove substance in the method is cheap, the cost is low, the process is simple, and rapid industrialization can be achieved.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a winding lithium ion battery and a preparation method thereof. Background technique [0002] As the energy density requirements of batteries increase year by year, the automation level of equipment continues to increase, and the size of batteries is getting larger and larger, resulting in the abnormality of arching and deformation of batteries produced by the battery winding process. This abnormality is likely to interfere with the installation size of the battery cell, affect the performance of the battery cell, and even cause a safety accident. [0003] At present, the semi-automatic winding production process adopts the method of inserting special-shaped insulating sheets during the winding process, pulling them out manually after winding, and inserting 1-5 special-shaped insulating sheets according to the actual situation. This process can solve the arching defor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0587H01M10/42H01M10/0525
CPCH01M10/0587H01M10/4235H01M10/0525Y02E60/10Y02P70/50
Inventor 杨和山陈湘彪曾伟荣
Owner 福建省致格新能源电池科技有限公司
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