Rubber-coated laminated core and button type lithium ion battery

By adopting the L-shaped glue wrap method in lithium-ion batteries, the problem of insulating glue bending angle interference welding is solved, the welding yield and production yield are improved, and the energy density of the battery is improved.

CN222654005UActive Publication Date: 2025-03-21CHONGQING YUNWEI NEW ENERGY TECH CO LTD
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Patent Information

Application Number
CN202420979623.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-08
Publication Date
2025-03-21
Estimated Expiration
2034-05-08

AI Technical Summary

Technical Problem

In the glue-encapsulated structure of existing lithium-ion batteries, insulating adhesive paper produces a bending angle exceeding the diameter in the diameter direction of the battery cell surface, interfering with the welding of the upper and lower covers of the battery, resulting in poor welds and reducing welding yield and throughput.

Method used

The L-shaped glue-cover method is adopted. The positive electrode ear strip tape and the negative electrode ear strip tape are both L-shaped and are pasted on the same end surface and side of the battery cell body to avoid the bending angle interference welding of the insulating glue.

Benefits of technology

It effectively improves the welding yield around the battery and product production yield, reduces the number of pole bars welded with the cover, increases the available space inside the battery, and increases the energy density.

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Abstract

The utility model relates to the technical field of lithium ion batteries, in particular to a rubber-coated laminated core and a button type lithium ion battery, the rubber-coated laminated core comprises a battery core body, a positive tab group and a negative tab group, the positive tab group and the negative tab group are respectively and correspondingly positioned on the end surfaces of two opposite ends of the battery core body, and the rubber-coated laminated core also comprises a positive tab strip adhesive tape and a negative tab strip adhesive tape, the positive tab strip adhesive tape is used for sticking and fixing a positive tab group, the negative tab strip adhesive tape is used for sticking and fixing a negative tab group, and the positive tab strip adhesive tape and the negative tab strip adhesive tape are L-shaped and are stuck on the same end surface and side surface of the battery cell body. According to the utility model, the encapsulation laminated core adopts an L-shaped encapsulation mode, and the positive tab adhesive tape and the negative tab adhesive tape are adhered to the same end surface and the same side surface of the battery cell body, so that the problem that a bent angle exceeding the diameter is generated in the diameter direction of the surface of the battery cell in which the tab group is encapsulated with the insulation paste is solved; and poor welding seams caused by interference of the bending angle of the insulating glue on peripheral welding of the upper and lower covers of the battery are avoided, so that the welding yield and the first pass yield of products are improved.
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