Battery Cell Isolation Assembly for Expansion Force Buffering
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Solution Overview
Problem
Existing battery technologies face challenges in improving the cycling performance of battery cells, particularly due to the expansion forces between adjacent cells during charging and discharging, which can lead to electrolyte leakage and reduced battery lifespan.
Innovation Solution
The introduction of a battery design that includes a buffer component between adjacent battery cells, along with a heat insulation component, to manage expansion forces and maintain structural integrity, thereby enhancing cycling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If buffer component size is increased to reduce expansion forces between battery cells, then cycling performance is improved, but device volume increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the buffer component thickness (h1) and the spacing between battery cells (D) to satisfy specific mathematical relationships. By adjusting these dimensional parameters within optimized ranges, the buffer component achieves sufficient expansion force absorption (500N≤F≤10000N) while minimizing the overall battery volume increase, thus resolving the contradiction between cycling performance improvement and volume control.
2Temperature
If heat insulation component is added between battery cells, then thermal management is improved, but device complexity increases
Solution Approach 1:
The patent applies the merging principle by integrating the heat insulation component with the buffer component into a unified isolation assembly. The heat insulation component is arranged between two adjacent battery cells and connected to the buffer component, combining thermal management and mechanical buffering functions into a single integrated structure. This reduces device complexity by eliminating the need for separate heat insulation and buffering components, while still achieving effective thermal management between battery cells.
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 proposed solution effectively reduces the risk of battery failure due to expansion forces, improves the cycling performance of battery cells, and balances energy density and structural stability.
Implementation Method 1
a stress M of the buffer component obtained according to a stress strain curve of the buffer component is 26*((h1−D)/h1)2−0.09*(h1−D)/h1 in MPa
Implementation Method 2
the heat insulation component can reduce the heat transfer between the two adjacent battery cells
Data Source
AI summary
The present application discloses a battery and an electricity consuming apparatus. The battery includes a plurality of battery cells stacked in a first direction and an isolation assembly. The isolation assembly includes a buffer component arranged between two adjacent battery cells, the spacing between the two adjacent battery cells in the first direction is D, an area of a surface of the buffer component abuts against the battery cell is S1, and a size of the buffer component in the first direction in an uncompressed state is h1; a force F applied by the battery cell to the buffer component meets: 500N≤F≤10000N, in which the stress M of the buffer component obtained according to a stress strain curve of the buffer component is 26*(h1−D)/h1)2−0.09*(h 1−D)/h1 in MPa, and by combining the area S1, the force F is obtained as F=S1*M.