Button Battery Cover Assembly Sealing With Adhesive Overflow
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Solution Overview
Problem
Button batteries in prior art exhibit poor sealing performance due to inadequate sealing between the top cover, conductive member, and shell, leading to risks of electrolyte leakage and corrosion.
Innovation Solution
A battery design featuring a cover assembly with a conductive member, top cover, and sealing member, where the sealing member has a first through hole smaller than the second through hole on the top cover, allowing adhesive overflow between the top cover and conductive member to enhance sealing performance and prevent electrolyte penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional top cover assembly with aluminum boss and ring upper cover connected by laser welding is used, then the battery structure is simple and manufacturing is easy, but the sealing performance is poor leading to electrolyte leakage risks
Solution Approach 1:
The cover assembly is divided into multiple functional components: conductive member, top cover, and sealing member. Each component performs a specific function - the sealing member specifically addresses sealing performance while the conductive member handles electrical connection, allowing optimization of each part independently to resolve the contradiction between sealing performance and structural simplicity
Solution Approach 2:
A sealing member is introduced as an intermediary component between the conductive member and top cover. This sealing member with the through hole structure acts as a mediator that specifically improves sealing performance without requiring complete redesign of the entire cover assembly, thus enhancing reliability while maintaining reasonable structural complexity
2Reliability
If the sealing member has a through hole diameter smaller than the top cover hole diameter, then adhesive can overflow to improve sealing, but the manufacturing precision requirement increases
Solution Approach 1:
The sealing member is pre-designed with a through hole having a specifically controlled diameter that is smaller than the top cover hole diameter. This preliminary design ensures that when adhesive is applied, it will naturally overflow from the larger top cover hole to the smaller sealing member hole area, creating effective sealing without requiring high-precision alignment during assembly
Solution Approach 2:
The critical parameter is the diameter of the through hole in the sealing member relative to the top cover hole. By changing this dimensional parameter to be smaller, the patent creates a built-in mechanism that guides adhesive flow and ensures sealing performance, while the specific parameter range (0.05-0.4mm difference) balances manufacturing precision requirements with sealing effectiveness
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design significantly improves the overall sealing performance of the battery, reducing the risk of sealing failure and enhancing the surface flatness and aesthetics by ensuring the adhesive overflows into the gap between the top cover and conductive member.
Implementation Method 1
a sealing member between the conductive member and the top cover; the conductive member electrically contacts the coiled core assembly; the sealing member is provided with a first through hole, the top cover is provided with a second through hole
Data Source
AI summary
The present disclosure provides a battery and an electronic device, which relate to the technical field of batteries and are used for solving the technical problem of poor sealing performance of batteries. The battery includes a shell, a cover assembly and a coiled core assembly located inside the shell; the shell is provided with an opening, and the cover assembly sealingly covers the opening; the cover assembly includes a conductive member, a top cover and a sealing member between the conductive member and the top cover; the conductive member electrically contacts the coiled core assembly; the sealing member is provided with a first through hole, the top cover is provided with a second through hole, and a diameter of the first through hole is smaller than that of the second through hole.