Square Battery Collector Offset Design
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Solution Overview
Problem
Existing square secondary batteries face reliability issues due to the vulnerability of the connection between the collector and the sealing plate under strong impact or vibration, which can lead to damage or breakage.
Innovation Solution
The battery design includes a collector with a base portion opposing the sealing plate and a lead portion extending from its edge, where the boundary between the base and lead portions is positioned on one side of the sealing plate's center, and the connection is offset to the other side, enhancing the structural integrity by distributing the load away from the connection point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the collector is directly connected to the sealing plate to simplify the configuration and reduce the number of parts, then the device complexity is reduced, but the connection becomes vulnerable to damage or breakage under strong impact or vibration
Solution Approach 1:
The collector is divided into a base portion and a lead portion with a boundary between them. The base portion connects to the sealing plate while the lead portion extends toward the electrode body. This segmentation allows the connection point to be optimized for stability while the lead portion absorbs mechanical stresses from impact or vibration, preventing damage to the sealing plate connection.
Solution Approach 2:
The base portion of the collector acts as an intermediary element between the sealing plate and the lead portion. It provides a stable connection interface with the sealing plate while transmitting forces through its structure to the lead portion, which is better positioned to handle mechanical stresses. This intermediary structure enhances connection reliability without adding external components.
2Reliability
If the boundary between the base portion and lead portion is positioned on one side of the sealing plate center while the connection is offset to the other side, then the load distribution is improved and connection damage is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The collector is designed with asymmetric positioning where the boundary between the base portion and lead portion is deliberately placed on one side of the sealing plate center, while the connection point is offset to the opposite side. This asymmetric configuration creates an optimized load distribution path that reduces stress concentration at the connection point, enhancing durability. The asymmetric design is integrated into the molding process rather than requiring post-manufacturing adjustment.
Solution Approach 2:
The invention changes the positional parameters of the collector's boundary and connection point relative to the sealing plate center. By optimizing these positional parameters during the molding process, the design achieves improved load distribution and connection durability. The parameter optimization is built into the manufacturing process to maintain precision without excessive complexity.
Data Source
AI summary
A square secondary battery includes an electrode body including a positive electrode plate and a negative electrode plate, a square outer package housing the electrode body, a metal sealing plate sealing an opening of the square outer package, and a positive electrode collector electrically connected to the positive electrode plate and the sealing plate. The positive electrode collector includes a base portion disposed to oppose the sealing plate, and a lead portion extending from an edge portion of the base portion towards the electrode body. In a short direction of the sealing plate, a boundary between the base portion and the lead portion is positioned on a first side with respect to a center of the sealing plate, and a connection between the sealing plate and the base portion of the positive electrode collector is offset to a second side with respect to the center of the sealing plate.