Secondary Battery Fixing Member Reduces Electrode Swelling
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Solution Overview
Problem
Secondary batteries experience thermal deformation and swelling during operation and manufacturing, leading to degradation in output performance due to heat generation and external heat exposure, which existing technologies have not effectively addressed.
Innovation Solution
A secondary battery design featuring an electrode assembly with a fixing member and insulating spacer that surrounds the electrode tab, preventing thermal deformation by controlling heat distribution and improving assembly modularity, including a flexible pouch case and adhesive tape or polyimide fixing members to manage thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the battery is welded or operated, then electrical connection and power output are achieved, but thermal deformation and swelling occur leading to performance degradation
Solution Approach 1:
The patent introduces a fixing member as an intermediary component positioned between the electrode tab and the electrode assembly. This fixing member mediates the thermal stress by providing a stable anchoring point that prevents the electrode tab from moving or deforming under thermal conditions, thereby maintaining electrical connection while preventing thermal deformation
Solution Approach 2:
The patent changes the physical state or properties of the fixing member to resist thermal effects. The fixing member is designed with specific material properties or structural characteristics that allow it to maintain its form and function under thermal stress, preventing the electrode assembly from swelling or deforming during welding or operation
2Power
If a multi-tab structure is used, then electrical properties are improved, but handling difficulty increases
Solution Approach 1:
The patent merges multiple electrode tabs with the fixing member into a single integrated assembly. The fixing member serves as a common support structure that holds multiple tabs together, allowing them to be handled as one unit rather than separate components, thus improving ease of operation while maintaining the electrical benefits of multi-tab structure
Solution Approach 2:
The fixing member acts as an intermediary that simplifies the handling of multiple electrode tabs. By providing a unified attachment point and support structure, it mediates between the multiple tabs and the external handling process, making the multi-tab structure as easy to handle as a single component
3Productivity
If components are designed for modularity, then assembly efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the battery components into distinct modular units: the electrode assembly, the electrode tab, and the fixing member. This segmentation allows each component to be manufactured and prepared independently, then assembled together efficiently. The fixing member as a separate component can be pre-positioned or attached in a single step, improving assembly efficiency while the modular nature keeps the overall device complexity manageable
Data Source
AI summary
A secondary battery is disclosed. In one aspect, the secondary battery includes an electrode assembly having a top space, a first main surface and a second main surface opposing each other. The secondary battery also includes an electrode tab extending outwardly from the top surface of the electrode assembly so as to channel heat away from the electrode assembly. The secondary battery further includes a fixing member formed adjacent to the electrode tab and covering at least the top surface of the electrode assembly so as to reduce a thermal deformation of the electrode assembly caused by the heat from the electrode tab.