Graded Compressive Stress in Solid-State Battery Pack
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Solution Overview
Problem
Existing battery packs face issues with non-uniform current density distribution and battery reaction uniformity, leading to reduced durability and performance, particularly in all solid state batteries without a non-aqueous electrolyte solution.
Innovation Solution
A battery pack design with a constraining mechanism that applies a graded compressive stress along the arrangement direction of the batteries, increasing from the side closer to the external terminal towards the side farther away, to ensure uniform current density and improved durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform constraining force is applied to all single batteries in the battery pack, then the structure is simple and easy to manufacture, but the current density distribution becomes non-uniform and battery reaction uniformity deteriorates
Solution Approach 1:
The patent applies different constraining forces to different regions of the battery pack. Specifically, the constraining mechanism is designed to apply a greater constraining force to single batteries that are farther from the external terminal, and a smaller constraining force to single batteries that are closer to the external terminal. This local differentiation of constraining force compensates for the natural decrease in current density with distance, achieving uniform battery reaction across all single batteries.
2Reliability
If the constraining force increases from the side closer to the external terminal towards the side farther away, then current density becomes uniform and battery performance improves, but the device complexity increases
Solution Approach 1:
The patent employs a spring-based constraining mechanism that dynamically adjusts the constraining force applied to each single battery. The springs are arranged and configured to naturally generate a gradient of constraining forces, with greater force applied to batteries farther from the external terminal. This dynamic mechanical design achieves the desired non-uniform constraining force distribution without requiring complex active control systems or multiple different spring constants.
Data Source
AI summary
Provided by the present disclosure is a batten pack in which both battery performance and durability of an all solid state battery are improved. Provided is a battery pack provided with a plurality of single batteries and a constraining mechanism. The constraining mechanism constrains the arranged single batteries in such a way that stress exists in the direction of compression along the arrangement direction. In addition, in a direction which intersects the arrangement direction, when a direction in which the external connection terminals extend is deemed to be a first direction and the direction opposite the first direction is deemed to a second direction, the constraining mechanism is configured in such a way that the stress increases from the first direction towards the second direction.