Battery Cell Elastic Member for Clamping Force and Electrolyte Release
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Solution Overview
Problem
Battery cells face issues with low service life due to inadequate clamping force during chemical formation, leading to wrinkling of electrode sheets and electrolyte solution depletion, which affects performance and stability during charge-discharge cycles.
Innovation Solution
Incorporating an elastic member with a pore structure into the battery cell's accommodating cavity, attached to the electrode assembly, which deforms to release electrolyte solution and maintain clamping force, reducing the gap between the shell and electrode assembly, and balancing liquid storage and deformation recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clamping force is increased to prevent electrode sheet wrinkling, then the electrode assembly stability is improved, but the risk of electrolyte solution depletion and performance degradation increases
Solution Approach 1:
The patent employs a spring member that dynamically adjusts the clamping force on the electrode assembly. The spring provides a baseline clamping force to prevent wrinkling during chemical formation, and automatically releases additional electrolyte solution when the electrode assembly expands during cycling, thereby preventing both wrinkling and electrolyte depletion through dynamic adaptation.
Solution Approach 2:
The spring member changes the clamping force parameter based on the expansion state of the electrode assembly. During chemical formation, the spring maintains high clamping force to prevent wrinkling. During cycling, as the electrode assembly expands, the spring compresses and reduces the clamping force, simultaneously releasing stored electrolyte solution to compensate for consumption.
2Quantity of substance
If the gap between shell assembly and electrode assembly is reduced to improve group margin, then the clamping force is enhanced, but the risk of electrode sheet wrinkling during chemical formation increases
Solution Approach 1:
The spring member is pre-loaded to provide a specific clamping force before the electrode assembly undergoes chemical formation. This preliminary clamping action prevents the electrode sheets from wrinkling when the gap between the shell assembly and electrode assembly is reduced, while the spring's elastic properties allow it to adapt to subsequent volume changes.
3Reliability
If the clamping force is maintained at high levels to ensure electrode assembly stability, then wrinkling is prevented, but the performance stability during charge-discharge cycles deteriorates
Solution Approach 1:
The spring member dynamically adjusts the clamping force based on the electrode assembly's expansion during cycling. The spring provides high clamping force initially to prevent wrinkling, then automatically reduces the force as the electrode assembly expands, maintaining performance stability while preventing structural damage.
Solution Approach 2:
The spring member serves dual functions: providing clamping force to prevent wrinkling and automatically releasing electrolyte solution to compensate for cyclic consumption. The system self-regulates based on the electrode assembly's volume changes, maintaining both structural integrity and performance stability without external intervention.
4Duration of action of moving object
If the elastic member's pore structure is optimized for electrolyte storage, then the service life is extended, but the deformation recovery capability may be compromised
Solution Approach 1:
The spring member incorporates a pore structure that stores electrolyte solution for compensation during cycling. The porous structure increases the surface area for electrolyte interaction and provides a reservoir that releases electrolyte when the spring compresses, extending service life while maintaining adequate deformation recovery capability through the elastic properties of the spring material.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the service life of battery cells by ensuring controlled expansion, reducing the risk of wrinkling, and maintaining performance stability through balanced clamping force and electrolyte management.
Implementation Method 1
the elastic member being configured to deform when the electrode assembly expands so as to release the electrolyte solution
Implementation Method 2
the elastic member having a pore structure for accommodating an electrolyte solution
Implementation Method 3
it is necessary to clamp the battery cell by a clamp. Due to the high group margin of the battery cell, the clamping force of the clamp upon the electrode assembly can reach a preset value
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus, the battery cell comprising a shell assembly, an electrode assembly, and an elastic member. The shell assembly has an accommodating cavity, with the electrode assembly and the elastic member being accommodated in the accommodating cavity, and the elastic member being attached to the electrode assembly. The elastic member has a pore structure for accommodating an electrolyte solution, and the elastic member is configured to deform when the electrode assembly expands so as to release the electrolyte solution.