Battery Cell Casing Geometry for Sealing and Thermal Uniformity
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Solution Overview
Problem
Circular-cylindrical battery cells face challenges with asymmetrical respiration under load, uneven temperature distribution, and high design effort for reliable storage and sealing, especially in fluid-temperature-controlled modules.
Innovation Solution
A battery cell design featuring a circular-cylindrical end portion with parallel lateral surfaces forming a receiving portion, allowing for efficient electrode stacking, improved sealing, and enhanced temperature control, with spacers for uniform fluid flow and reduced movement to prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a completely circular-cylindrical battery cell design is used, then sealing reliability is improved, but energy density decreases due to dead spaces
Solution Approach 1:
The battery cell casing is segmented into two distinct portions: a circular-cylindrical end portion for sealing and a receiving portion with parallel lateral surfaces for electrode arrangement. This segmentation allows each portion to optimize its function - the circular end provides reliable sealing while the rectangular receiving portion minimizes dead spaces and maximizes energy density.
2Volume of moving object
If electrodes are arranged in stacks in a circular-cylindrical cell, then space utilization improves, but temperature distribution becomes uneven
Solution Approach 1:
The receiving portion is designed with parallel lateral surfaces that create a more uniform internal geometry, allowing for better thermal management. The parallel surfaces enable more uniform heat distribution and fluid flow patterns compared to a completely circular design, addressing the temperature distribution issue while maintaining good space utilization through the stack arrangement.
3Ease of manufacture
If a circular-cylindrical cell design is used, then manufacturing is simplified, but temperature control efficiency decreases
Solution Approach 1:
The cell design segments the casing into a circular-cylindrical end portion (easy to manufacture) and a receiving portion with parallel lateral surfaces (optimized for thermal management). This allows the majority of the cell to maintain manufacturing simplicity while the receiving portion provides enhanced temperature control efficiency through its geometry that facilitates better fluid flow and heat distribution.
Data Source
AI summary
A battery cell has electrodes (2) surrounded by a cell casing (1), with an end portion (3) of the cell casing (1) forming a circular cylinder. The battery cell in particular when used in a fluid-temperature-controlled battery module with good temperature-control properties, has reliably sealed storage and the energy density of circular-cylindrical battery cells is thus exceeded. A receiving portion (4) connects, at the circular-cylindrical end portion (3), to lateral surfaces that are parallel opposite one another in pairs.