Battery Tab Connection Structure Against Thermal Deformation
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Solution Overview
Problem
Existing secondary batteries face issues with thermal deformation at the connection points between electrodes and terminals, which can lead to performance degradation and safety risks.
Innovation Solution
Incorporation of deformation prevention parts in the connection members, specifically reinforcement protrusions on the outer plates of current collectors, to prevent thermal deformation by distributing stress and maintaining structural integrity during thermal events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If connection members are used to connect electrodes and terminals, then electrical connection is achieved, but thermal deformation occurs at connection points during thermal events
Solution Approach 1:
The connection member is divided into multiple parts: a first connection part connected to the electrode, a second connection part connected to the terminal, and a deformation prevention part connecting these two parts. This segmentation allows each part to perform its specific function independently, with the deformation prevention part specifically designed to manage thermal stress.
Solution Approach 2:
The deformation prevention part is designed with specific local properties (different from the connection parts) to handle thermal deformation. This part has enhanced structural characteristics that allow it to absorb and distribute thermal stress locally, preventing deformation from propagating to the critical connection points between electrodes and terminals.
2Reliability
If reinforcement protrusions are added to the connection member, then thermal deformation is prevented, but device complexity increases
Solution Approach 1:
The deformation prevention part with reinforcement protrusions is pre-designed and pre-positioned in the connection member before thermal events occur. This preliminary structural arrangement ensures that when thermal stress is applied, the reinforcement protrusions are already in place to distribute and manage the stress, preventing deformation rather than correcting it after the fact.
Solution Approach 2:
The connection member employs a composite structure combining different geometric forms (flat connection parts and protruding reinforcement parts) within the same component. This composite design allows the connection member to simultaneously provide electrical connection functionality and thermal deformation resistance without requiring separate components.
Data Source
AI summary
A secondary battery includes a case, an electrode assembly inside the case, the electrode assembly including a first electrode and a second electrode, a first tab member connected to the first electrode, the first tab member extending from the electrode assembly, a cap assembly facing the electrode assembly, the cap assembly including a first terminal and a second terminal, and a first connection member between the electrode assembly and the cap assembly, the first connection member being connected to the first terminal and the first tab member, the first connection member further including a first deformation prevention part configured to prevent thermal deformation when connected to the first tab member.