Coating device and pole piece

By using the same set of valve control components and mold cavity gasket design in the coating device, the coating cost is reduced and the coating surface density is made more uniform. This solves the problems of high cost and thinning zone in existing coating devices, and improves the safety and stability of the battery.

CN223698291UActive Publication Date: 2025-12-23BYD CO LTD
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Patent Information

Application Number
CN202520251067.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-02-17
Publication Date
2025-12-23
Estimated Expiration
2035-02-17

AI Technical Summary

Technical Problem

Existing coating equipment is costly and easily forms thinning zones during the coating process, leading to low cell capacity and lithium plating risks, and it is difficult to effectively control coating thickness and N/P ratio.

Method used

A coating apparatus is employed, including a die head and a valve control assembly. By setting the same set of valve control assemblies, the die head only needs one feeding system when there are at least two cavities. Combined with the design of the cavity gasket and flow channel, the alternating discharge of at least two cavities is achieved, ensuring coating uniformity and dispersion of the thinning zone.

Benefits of technology

It reduces equipment costs, improves the uniformity of coating surface density, reduces the impact of thinning zones, and enhances battery safety and stability.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a coating device and a pole piece, and relates to the technical field of lithium ion battery preparation. The coating device comprises a die head part and a valve control assembly, wherein at least two die cavities are formed in the die head part. The valve control assembly is provided with a feeding port and at least two discharging ports, the valve control assembly is used for controlling the feeding port to communicate with any discharging port and to be disconnected from the other discharging ports, and the at least two discharging ports communicate with the at least two die cavities in a one-to-one correspondence mode. According to the coating device disclosed by the utility model, the control valve is simplified, so that the overall cost and complexity of the device are reduced, and the response speed and coating precision of equipment are improved. Meanwhile, according to the pole piece disclosed by the utility model, thinning areas can be reduced to a certain extent, the uniformity of the density of a coating surface is improved, and the safety and the stability of the battery are ensured.
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