Battery Electrode Terminal Layout for Fast-Charging Heat Control
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Solution Overview
Problem
Batteries experience temperature increases at the electrode terminal during fast-charging, leading to potential thermal issues.
Innovation Solution
A battery design with an electrode terminal that has a wider inner current collecting portion compared to the outer current collecting portion, distributing current more evenly and reducing heat retention, along with an L-shaped plan-view configuration and an intermediate portion for enhanced sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the electrode terminal has a uniform width throughout its length, then the structure is simple and easy to manufacture, but the current becomes concentrated at the terminal causing temperature increase during fast-charging
Solution Approach 1:
The electrode terminal is designed with varying width along its length, where the inner current collecting portion has a larger width than the outer current collecting portion. This local variation in geometry allows different sections to serve different functions: the wider inner portion distributes current to reduce heat generation, while the narrower outer portion maintains adequate sealing contact. This resolves the contradiction by optimizing local structure rather than using a uniform design throughout.
Solution Approach 2:
The electrode terminal employs an asymmetric width profile along its longitudinal axis, creating an intentional geometric asymmetry that addresses the thermal issue. The asymmetric design ensures that the current distribution is optimized along the terminal's length, preventing concentration at critical sections while maintaining structural integrity and sealing performance.
2Temperature
If the inner current collecting portion has a larger width, then current distribution is improved and temperature increase is suppressed, but the sealing region space is reduced
Solution Approach 1:
The width variation is applied locally only to the inner current collecting portion where current distribution is critical, while the outer current collecting portion maintains a narrower width that preserves adequate sealing region space. This localized application of the width increase minimizes the impact on sealing area while achieving the thermal management objective.
Solution Approach 2:
The design compensates for the reduced sealing area by optimizing the thickness and depth dimensions of the sealing structure. By adjusting parameters in the third dimension (thickness), the overall sealing performance is maintained even though the planar sealing area is reduced due to the wider inner current collecting portion.
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 design effectively suppresses temperature increases at the electrode terminal during fast-charging, improving battery durability and maintaining sealing integrity.
Implementation Method 1
When a battery is fast-charged, for example, the current is concentrated to the electrode terminal so that the temperature of the electrode terminal is increased in some cases
Data Source
AI summary
A main object of the present disclosure is to provide a battery capable of suppressing the temperature increase of an electrode terminal even when the battery is, for example, fast-charged. The present disclosure achieves the object by providing a battery comprising an electrode body, and an exterior body including an inner region configured to house the electrode body, and the battery includes an electrode terminal placed so as to extend from the inner region to an outer region of the exterior body, the electrode terminal includes an inner current collecting portion placed in the inner region and connected to an electrode tab of the electrode body, and an outer current collecting portion placed in the outer region, and a width of the inner current collecting portion is larger than a width of the outer current collecting portion.