Battery Electrolyte and Adhesive Ratio for Swelling Control
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Solution Overview
Problem
Lithium-ion batteries face safety issues such as thermal runaway, fires, and explosions due to rapid temperature increases and mechanical stress, which are exacerbated by the properties of the double-sided hot melt adhesive used in their construction.
Innovation Solution
Optimizing the ratio of the double-sided hot melt adhesive area to the bare cell surface area and the mass percentage of carbonate solvent in the electrolyte solution to ensure optimal adhesive performance and reduce swelling, thereby enhancing the safety and high-temperature cycling performance of the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the area of double-sided hot melt adhesive is increased to prevent cell movement and improve safety, then the safety performance is improved, but the adhesive swells more due to carbonate solvent absorption
Solution Approach 1:
The patent optimizes the area ratio parameter (adhesive area to cell surface area) and the electrolyte composition parameter (carbonate solvent percentage) to achieve optimal safety performance while minimizing adhesive swelling. By carefully controlling these parameters, the invention resolves the contradiction between improving safety and maintaining adhesive integrity.
2Use of energy by moving object
If the carbonate solvent percentage in electrolyte is increased to improve ionic conductivity, then the electrical performance is improved, but the adhesive swelling is exacerbated
Solution Approach 1:
The patent optimizes the carbonate solvent percentage parameter in the electrolyte to achieve the best balance between ionic conductivity and adhesive swelling control. By adjusting this parameter within a specific range, the invention improves electrical performance while minimizing the harmful swelling effect on the adhesive.
3Ease of manufacture
If the battery structure is simplified to reduce manufacturing cost, then the ease of manufacture is improved, but the protection against thermal runaway and mechanical damage is reduced
Solution Approach 1:
The patent applies double-sided hot melt adhesive to the cell surface before assembly to create preliminary protection against movement and thermal runaway. This preliminary protective measure is integrated into the manufacturing process, providing enhanced safety without significantly increasing manufacturing complexity or cost.
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
The optimized solution improves the safety performance of lithium-ion batteries by maintaining adhesive integrity and reducing the risk of thermal runaway, as evidenced by improved pass rates in drop tests and high-temperature cycling performance.
Implementation Method 1
a double-sided hot melt adhesive is attached between the bare cell and the aluminum-plastic film. The double-sided hot melt adhesive melts under hot pressure, and then is tightly bonded to the aluminum-plastic film at the outer layer
Implementation Method 2
reducing an impact of the carbonate solvent on swelling of the double-sided hot melt adhesive
Data Source
AI summary
A battery includes a bare cell, a double-sided hot melt adhesive, and an electrolyte solution. The electrolyte solution includes an organic solvent; and the battery satisfies: 0.5≤A/B≤2, where A is a percentage of an area of the double-sided hot melt adhesive to an area of the long and wide surface of the bare cell, and B is a percentage of a mass of the carbonate solvent to a total mass of the organic solvent. According to the present disclosure, A/B is optimized, so as to ensure optimal performance of the electrolyte solution while reducing an impact of the carbonate solvent on swelling of the double-sided hot melt adhesive, and maintain adhesive of the double-sided hot melt adhesive.