Battery Restraining Structure for Controlled Cell Expansion
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Solution Overview
Problem
Batteries in electric vehicles face reliability and service life issues due to inconsistent deformation of battery cells, leading to structural failure and reduced energy density.
Innovation Solution
A battery design featuring a first restraining component and a second restraining component with a weak area, allowing controlled expansion of battery cells, thereby increasing restraining force and minimizing deformation, while maintaining energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a restraining component is added to constrain battery cells, then reliability is improved, but device complexity increases
Solution Approach 1:
The restraining component is divided into multiple independent restraint units, each capable of constraining individual battery cells. This segmentation allows the system to provide reliable restraint while maintaining modularity and reducing overall complexity through standardized repeating elements.
Solution Approach 2:
The restraining component utilizes a three-dimensional framework structure that provides restraint forces in multiple directions (vertical, horizontal, and diagonal). This multi-dimensional approach enhances reliability by distributing constraints across spatial dimensions rather than relying on a single complex planar mechanism.
2Reliability
If restraining force is increased to prevent debonding, then reliability is improved, but stress on structural members increases
Solution Approach 1:
The total restraining force is distributed across multiple restraint units positioned at different locations on the battery cell. This segmentation of force application prevents concentration of stress on any single structural member while maintaining sufficient total restraint to prevent debonding.
Solution Approach 2:
The restraining component is pre-installed and pre-tensioned before battery cell expansion occurs. This preliminary action establishes optimal bonding contact from the beginning, preventing debonding during subsequent expansion cycles without requiring excessive stress on structural members during operation.
3Duration of action of moving object
If battery cell expansion is allowed, then service life is prolonged, but structural integrity may be compromised
Solution Approach 1:
The restraining component is designed with controlled flexibility that allows specific parameters of battery cell expansion (volume change, dimensional growth) while maintaining restraint within safe limits. The component's mechanical properties are optimized to permit beneficial expansion that extends service life while preventing expansion that would compromise structural integrity.
Solution Approach 2:
The restraining component provides dynamic restraint that adapts to battery cell expansion during operation. Rather than rigid fixed constraints, the system allows controlled movement and deformation within defined parameters, enabling the battery to expand and contract during charging cycles while maintaining overall structural integrity throughout the service life.
Data Source
AI summary
Embodiments provide a battery and a power consuming device. In some embodiments, the battery includes: a case assembly, including a case and fixed beams fixed in the case; a battery module, arranged in the case and including a plurality of battery cells; a first restraining component, configured to cover the battery module and fixed to the fixed beams; and a second restraining component, located on the side of the first restraining component away from the battery module and fixed to the fixed beams, wherein the second restraining component is provided with a weak area, and the second restraining component is configured to apply a restraining force to the first restraining component and to allow expansion of the battery cells in the weak area.