Secondary Battery Connection Plate Design
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Solution Overview
Problem
Conventional methods for attaching electrode tabs to the case in high-power batteries increase processing costs and are prone to damage from stress, such as vibrations or mechanical shocks, due to the use of auxiliary tabs with complex bending structures.
Innovation Solution
A secondary battery design that minimizes the welded and bent portion of the electrode tab by directly connecting the electrode assembly to the case using a connection plate formed by stamping the bottom plate, eliminating the need for auxiliary tabs and reducing stress vulnerabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an auxiliary tab with bending structures is used to connect the electrode tab to the case, then the electrode tab can be attached to the case, but the processing cost increases and the bent portion is prone to damage from stress
Solution Approach 1:
The patent removes the auxiliary tab component entirely from the connection structure. Instead of using a separate auxiliary tab with bending structures, the electrode tab is directly connected to the connection plate, eliminating the source of stress concentration and processing complexity.
Solution Approach 2:
The patent merges the electrode tab connection function directly into the connection plate structure. The electrode tab is welded directly to the connection plate without intermediate components, simplifying the overall structure and reducing processing steps while maintaining connection reliability.
2Ease of manufacture
If an auxiliary tab with complex bending structures is used, then the electrode tab can be connected to the case, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the complex bending structures from the auxiliary tab design. The connection is achieved through a simple direct weld between the electrode tab and connection plate, eliminating unnecessary structural complexity.
Solution Approach 2:
Instead of creating complexity through bending structures to achieve connection, the patent inverts the approach by using a simple flat connection plate that requires no bending, achieving the same connection function with reduced complexity.
3Ease of manufacture
If the auxiliary tab is bent and welded, then the electrode tab can be attached to the case, but the welded and bent portion is vulnerable to cutting from extended stress
Solution Approach 1:
The patent removes the vulnerable bent portion from the connection structure by eliminating the auxiliary tab. The direct connection to the flat connection plate eliminates stress concentration points that would lead to cutting under extended stress.
Solution Approach 2:
The patent designs the connection plate with sufficient thickness and structural support beforehand to withstand stress without requiring bending. The rigid flat structure provides inherent stress resistance, cushioning against potential damage before it occurs.
Data Source
AI summary
There is provided a secondary battery comprising an electrode assembly including a first electrode plate having a first electrode tab, a second electrode plate having a second electrode tab and a separator between the first electrode plate and the second electrode plate, a case including a body accommodating the electrode assembly, a cap plate covering a top portion of the body, and a bottom plate covering a bottom portion of the body, a first electrode terminal electrically connected to the first electrode tab, a second electrode terminal electrically connected to the second electrode tab through the case, and a connection plate electrically connected to the second electrode tab and configured to bend away from the bottom plate, the connection plate being on the bottom plate.