Cover plate assembly, shell and battery

By designing the mounting structure of plastic parts and terminal base plates in the lithium battery cover assembly, the problem of electrolyte accumulation was solved, achieving precise installation and structural stability, and improving the safety and reliability of the battery.

CN224481046UActive Publication Date: 2026-07-10SVOLT ENERGY TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202521033563.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-05-23
Publication Date
2026-07-10
Estimated Expiration
2035-05-23

AI Technical Summary

Technical Problem

During the manufacturing process of lithium batteries, the assembly gap is caused by manufacturing tolerances when the terminal base plate in the top cover structure is assembled with the insulating plastic parts at the bottom of the top cover. This leads to the accumulation of electrolyte and crystallization at low temperatures, affecting the insulation performance and safety of the battery.

Method used

Design a cover plate assembly including a plastic part and an electrode base plate, which allows for thermal expansion and contraction by setting first and second mounting parts in the mounting groove and providing tolerance space between them, ensuring accurate installation and reducing electrolyte accumulation.

Benefits of technology

It improves assembly precision and efficiency, enhances structural stability, reduces the risk of electrolyte accumulation, extends battery life, and improves battery safety and reliability.

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Abstract

The utility model relates to the field of batteries, and provides a cover plate assembly, a shell and a battery. The cover plate assembly comprises a plastic part, a mounting groove is formed in the plastic part, a first mounting part is formed in the mounting groove in the width direction of the mounting groove, and a first gap is formed between the edge of the first mounting part and the groove side wall of the mounting groove; a second mounting part is formed on the pole bottom plate, and the pole bottom plate is suitable for being mounted in the mounting groove through cooperation of the first mounting part and the second mounting part. According to the cover plate assembly, the pole bottom plate can be accurately mounted in the mounting groove of the plastic part, so that the assembly precision is improved; due to the existence of the first gap, a certain fault-tolerant space is provided for the assembling process, and even if a certain size deviation exists in the manufacturing process, the pole bottom plate can be smoothly mounted; the first gap can allow the cover plate assembly and the cover plate assembly to stretch out and draw back freely within a certain range, structural deformation or damage caused by thermal expansion and cold contraction is avoided, the structural stability of the cover plate assembly is guaranteed, and the electrolyte accumulation risk is reduced.
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