Secondary Battery Top Cap Assembly Fixing Structure
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Solution Overview
Problem
The existing top cap assembly for secondary batteries has a complex structure and insufficient fixing strength, leading to reduced power density and reliability due to the base portion of the electrode terminal being inside the case, which affects assembling efficiency and can cause disconnection issues.
Innovation Solution
A top cap assembly with a first and second fixing component that securely attaches the electrode terminal to the top cap plate, eliminating the need for a fixed structure inside the case, enhancing fixing strength and reducing internal space occupation, thereby improving energy density and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base portion of the electrode terminal is located inside the case, then the electrode terminal can be fixed to the top cap plate, but the space utilization inside the case is reduced, thereby reducing the power density
Solution Approach 1:
The patent moves the base portion of the electrode terminal from the internal space (inside the case) to the external space (outside the case), utilizing a different spatial dimension. The top cap plate extends outward to provide a mounting surface for the base portion, allowing fixation without occupying valuable internal volume, thus resolving the contradiction between fixing reliability and space utilization.
2Reliability
If the electrode terminal is fixed using snap spring or riveting, then the electrode terminal can be attached to the top cap plate, but the assembling procedure becomes complicated and assembling efficiency is affected
Solution Approach 1:
The patent merges the top cap plate with the base portion of the electrode terminal into an integrated assembly. The top cap plate is designed with an integrated base portion that directly contacts and is fixed to the top cap plate, eliminating the need for separate snap springs or rivets. This integration simplifies the assembly process while maintaining fixing strength, resolving the contradiction between reliability and productivity.
3Ease of manufacture
If the electrode terminal is fixed using snap spring or riveting, then the electrode terminal can be attached to the top cap plate, but the fixing strength is insufficient, causing disconnection
Solution Approach 1:
The patent segments the electrode terminal into distinct portions: the base portion for fixation and the extension portion for electrical connection. This segmentation allows the base portion to be optimally designed for strong mechanical attachment to the top cap plate, while the extension portion maintains its electrical function. The clear separation of functions enables simple assembly with high fixing strength, resolving the contradiction between ease of manufacture and reliability.
Data Source
AI summary
A top cap assembly of a secondary battery and second battery is provided. The top cap assembly may comprise: a top cap plate comprising an electrode extraction hole; an electrode terminal comprising a terminal plate, the terminal plate may be located on a side of the top cap plate and cover the electrode extraction hole; a first fixing component, the first fixing component may at least partially surround the terminal plate to fix the electrode terminal to the first fixing component; and a second fixing component comprising a main body and a first connection portion connected to the main body and extends away from the terminal plate, the main body may be fixedly connected to the first fixing component, and the first connection portion may be fixedly connected to the top cap plate.