Battery Protection Device Bonding Structure for Stable Tab Connection
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Solution Overview
Problem
The connection between existing battery protection devices and battery cells is not stable enough, leading to potential separation issues that can result in reduced battery service life.
Innovation Solution
A battery design that incorporates a protection device bonded to the shell using a second bonding member, which improves bonding reliability and reduces the likelihood of separation, thereby enhancing the connection between the protection device and the shell, and includes multiple bonding members to optimize size and material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection device is connected to a battery cell using existing connection structures, then the battery can function with basic protection, but the connection stability is insufficient leading to potential separation issues
Solution Approach 1:
The connection structure is divided into multiple bonding members (first bonding member and second bonding member) that bond the protection device to different surfaces of the shell. This segmentation distributes the bonding load and creates multiple attachment points, preventing single-point failure and improving overall connection stability.
Solution Approach 2:
Multiple bonding members are combined to work together in securing the protection device. The first bonding member bonds to the first wall surface while the second bonding member bonds to the second wall surface, creating a combined bonding system that leverages both bonding surfaces for enhanced stability.
2Reliability
If bonding members are made larger to improve bonding reliability, then connection stability improves, but material costs and device size increase
Solution Approach 1:
The bonding arrangement transitions from relying on a single large bonding surface to utilizing two smaller bonding surfaces in different spatial dimensions (first wall surface and second wall surface). This dimensional distribution allows smaller bonding members to achieve equivalent or superior bonding reliability through geometric arrangement.
Solution Approach 2:
The design changes the bonding parameters by distributing the bonding area across multiple surfaces rather than concentrating it in one location. This parameter change allows optimization of bonding member size and material usage while maintaining or improving bonding reliability.
Data Source
AI summary
A battery includes an electrode assembly, a shell, a first bonding member, a second bonding member, and a protection device. The electrode assembly includes a first tab. The shell includes a first main body part and a side edge part connected to the first main body part, the side edge part includes a first wall surface and a second wall surface. The first bonding member includes a first bonding surface and a second bonding surface disposed opposite each other. The protection device includes a first part and a second part, where the first part is bonded to the second bonding surface, and the second part is welded to a part of the first tab extending out of the shell and then bent to be stacked with the first part. A third part of the second bonding member is bonded to a surface of the first part facing the second part.