Unlock instant, AI-driven research and patent intelligence for your innovation.

A method and device for improving pole piece baking cracking

A pole piece and screw pump technology, applied to the surface coating liquid device, battery electrodes, electrode manufacturing, etc., can solve the problems of long time for water removal, waste of resources, and reduced production efficiency

Active Publication Date: 2021-04-23
ZHUHAI COSMX BATTERY CO LTD
View PDF11 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The peeling force of the pole piece after baking is reduced, and the appearance cannot meet the demand, so it can only be scrapped, resulting in a waste of resources and reducing production efficiency
[0004] In the battery production industry, in order to prevent the pole pieces from cracking, plasticizers, usually ethylene carbonate, are usually added during the batching process, and then the slurry is directly coated after the slurry is prepared. After coating, both sides of the current collector have plasticizers. Plasticizer, but the plasticizer usually contains -OH, which is equivalent to water molecules, and the battery has strict requirements on moisture, and the subsequent water removal time is too long, resulting in a decrease in production efficiency

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method and device for improving pole piece baking cracking

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0015] Specific Embodiment 1: This embodiment describes a method for improving pole piece baking cracking. The method specifically includes: when coating the pole piece on the A side, the slurry and the plasticizer are respectively processed by a screw pump. The material is metered out, then mixed by a static mixer, then transported to the coating die through the feed pipe for coating, and then dried. During the drying process, part of the plasticizer in the pole piece will be in the oven evaporated, but some remained. Afterwards, the pole piece is then coated on the B side. At this time, the feed pump of the plasticizer is turned off and the normal coating can be carried out. The addition ratio of the plasticizer is 0.1~1g of plasticizer per 100g of slurry, and the plasticizer is mixed with the slurry by a static mixer before coating. Since the coating has been carried out on the original substrate, which is equivalent to the increase of the thickness of the substrate, the s...

specific Embodiment approach 2

[0016] Embodiment 2: A method for improving pole piece baking cracking described in Embodiment 1, the plasticizer is aliphatic dibasic acid esters, phthalates, benzene polyesters, benzene One or more combinations of formate esters, ethyl cellulose, polyol esters, epoxies, citric acid esters, polyesters.

specific Embodiment approach 3

[0017] Embodiment 3: A method for improving pole piece baking cracking described in Embodiment 2, wherein the phthalates are phthalates or terephthalates. The commonly used plasticizer is ethylene carbonate, referred to as EC.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method and device for improving pole piece baking cracking, belonging to the technical field of lithium-ion secondary batteries. The method is specifically as follows: when coating the A side of the pole piece, the slurry and the plasticizer are metered and discharged by their respective screw pumps, then mixed by the static mixer 5, and then transported to the The coating die head 6 is used for coating, then drying, and then coating on the B side of the pole piece. At this time, the feed pump for transporting the plasticizer is turned off, and normal coating can be performed. The advantages of the present invention are: the static mixer is used to mix the slurry and the plasticizer, and the plasticizer is added to the slurry of the pole piece on the A side, and the plasticizer is not added to the B side, which can improve the pole piece baking cracking phenomenon, and Without affecting the production of subsequent processes, the appearance of the pole piece is improved, the electrochemical performance of the battery is improved, and the production cost is saved at the same time, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion secondary batteries, and in particular relates to a method and a device for improving pole piece baking cracking. Background technique [0002] As a new type of energy storage power supply, lithium-ion secondary batteries have the advantages of high energy, high working voltage, wide working temperature range, small size, light weight, long storage life, etc., and have become a new generation of green and environmentally friendly batteries. , Power batteries, energy storage batteries and other fields have received great attention. [0003] At present, in the production process of lithium-ion secondary battery electrode pole piece, coating is a key process of battery production, which directly determines the appearance, capacity, electrochemical performance, etc. of the battery, and also determines the production efficiency of the battery. Therefore, qualified electrodes Sheets are the basis f...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/139B05C11/10
CPCB05C11/1036H01M4/0404H01M4/139Y02E60/10
Inventor 彭宁王静王琳川徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD