Rectangular Battery Sealing Plate Recess for Insulator Positioning
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Solution Overview
Problem
In rectangular secondary batteries, the insulator between the sealing plate and the current collector can displace, compromising sealability and potentially damaging the current collection portion, leading to reliability issues.
Innovation Solution
A rectangular secondary battery design featuring a tab system with a current collector member and insulator, where the insulator has a protrusion that fits into a recess on the sealing plate, preventing large displacement and maintaining the sealing plate's strength, even under increased internal pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulator is disposed between the sealing plate and the current collector to prevent direct contact, then the reliability is improved, but the insulator may displace and compromise sealability
Solution Approach 1:
The recess in the sealing plate acts as an intermediary structure that receives and secures the insulator, preventing its displacement while maintaining the insulating function between the sealing plate and current collector
Solution Approach 2:
The recess provides a three-dimensional positioning feature that constrains the insulator in multiple directions, transforming a potentially unstable two-dimensional placement into a stable three-dimensional fit
2Reliability
If the insulator is prevented from displacing, then the sealability is improved, but the current collection portion may be damaged
Solution Approach 1:
The sealing plate is segmented with a recess that specifically accommodates the insulator, separating the insulator positioning function from the overall sealing structure and preventing stress concentration on the current collector
3Ease of manufacture
If the first recess is disposed at the center of the sealing plate, then the insulator positioning is simplified, but the sealing plate strength decreases
Solution Approach 1:
The recess is positioned asymmetrically at an end portion rather than the center of the sealing plate, creating an optimized structure that maintains sealing plate strength while still providing effective insulator positioning
Data Source
AI summary
A rectangular secondary battery includes a rectangular casing that contains an electrode body, a sealing plate that seals an opening of the rectangular casing; a positive electrode tab group that is composed of a plurality of positive electrode tabs, a positive electrode terminal that is electrically connected to the positive electrode tab group and attached to the sealing plate, a second positive electrode current collector that is electrically connected to the positive electrode tab group and the positive electrode terminal, and a second insulator that is disposed between the sealing plate and the second positive electrode current collector. The sealing plate has a gas discharge valve. The sealing plate has a first recess. The second insulator has a first protrusion. In a transversal direction of the sealing plate, the first recess is displaced from a center of the sealing plate toward an end portion of the sealing plate.