Electrode Assembly Fixing Members for Stable Secondary Batteries
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Solution Overview
Problem
Secondary batteries face instability issues due to electrode plate tearing and substrate tab breakage during repeated charging and discharging, which affects cell stability and requires a method to securely fix the electrode assembly within the case.
Innovation Solution
The use of fixing members, such as tapes or spray coatings made of polystyrene or polyethylene, attached to various surfaces of the electrode assembly, including the lower surface, side surfaces, and end surfaces, to securely position the assembly within the case, preventing movement and enhancing electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixing members are attached to the electrode assembly to prevent movement and tearing, then reliability is improved, but device complexity increases
Solution Approach 1:
The fixing member integrates multiple functions: it acts as both a securing element to prevent electrode assembly movement and tearing, and as an insulating layer between the electrode assembly and case. This merging of functions reduces the need for separate components, thereby improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The fixing member serves as an intermediary element positioned between the electrode assembly and the case. It mediates the interaction by providing both mechanical support (preventing tearing and movement) and electrical insulation, thus resolving the contradiction between improving reliability and maintaining simple device structure.
2Manufacturing precision
If fixing members are used to secure the electrode assembly, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The fixing member is attached to the electrode assembly in advance during the manufacturing process, before final assembly into the case. This preliminary action ensures that the electrode assembly is pre-positioned and secured with the required precision, while the attachment process itself is designed to be straightforward, minimizing the impact on ease of manufacture.
3Strength
If fixing members are attached to prevent electrode plate tearing, then strength is improved, but weight increases
Solution Approach 1:
The fixing member is implemented as a thin film or coating layer attached to the electrode assembly. This thin-film approach provides the necessary structural strength to prevent electrode plate tearing and assembly movement, while minimizing the added weight compared to thicker or more substantial fixing structures.
Data Source
AI summary
A secondary battery, including an electrode assembly including a plurality of first electrode plates coated with a first active material, a plurality of second electrode plates coated with a second active material, and a separator positioned between each of the plurality of first electrode plates and each of the plurality of second electrode plates, and a case accommodating the electrode assembly through an internal space, wherein the electrode assembly includes a fixing member on at least one surface in contact with the case.