Battery Restraining Component Weak Area Design
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Solution Overview
Problem
Lithium-ion batteries in electric vehicles face reliability issues and short service life due to inconsistent deformation of battery cells, leading to debonding and reduced restraining forces, which can cause structural failure and premature battery failure.
Innovation Solution
A battery design incorporating a restraining component with a weak area that allows deformation to match the expansion of battery cells, reducing debonding and maintaining structural strength, while a bonding layer forms a limiting boss to enhance the restraining force without compromising overall structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a restraining component is used to prevent battery cell expansion, then the structural strength is improved, but the bonding layer debonds due to inconsistent deformation
Solution Approach 1:
The restraining component incorporates weak areas with different mechanical properties (lower stiffness) compared to the strong areas. This local quality differentiation allows specific regions to deform with battery cell expansion while maintaining overall structural strength, preventing bonding layer debonding at the weak areas while preserving restraining force at strong areas.
Solution Approach 2:
The restraining component transitions from a static rigid structure to a dynamic structure with variable stiffness. The weak areas enable the component to adapt its deformation characteristics in response to battery cell expansion, allowing the structure to dynamically adjust and maintain contact with expanding cells without causing bonding failure.
2Force
If the restraining component is made rigid to maintain restraining force, then the restraining force is improved, but the service life is reduced due to debonding and structural failure
Solution Approach 1:
The restraining component uses local quality differentiation with weak areas that have lower stiffness to accommodate battery expansion, preventing debonding and structural failure, while strong areas maintain sufficient restraining force. This resolves the contradiction between maintaining restraining force and extending service life.
Solution Approach 2:
The restraining component is segmented into weak areas and strong areas with distinct functions. Weak areas handle deformation and expansion accommodation, while strong areas provide restraining force, allowing the component to simultaneously achieve both deformation compatibility and force maintenance over extended service life.
3Reliability
If the restraining component deforms to follow battery cell expansion, then the bonding layer adhesion is improved, but the overall structural strength is compromised
Solution Approach 1:
The restraining component incorporates weak areas with reduced stiffness that can deform to follow battery cell expansion, maintaining bonding layer adhesion. The strong areas compensate for this local deformation by providing the necessary overall structural strength, resolving the contradiction between adhesion and strength.
4Adaptability or versatility
If the restraining component is made flexible to accommodate expansion, then the deformation compatibility is improved, but the restraining force on other battery cells is reduced
Solution Approach 1:
The restraining component uses local quality differentiation where weak areas provide deformation compatibility with expanding battery cells, while strong areas maintain restraining force on adjacent cells. This spatial differentiation resolves the contradiction between flexibility and force maintenance.
Solution Approach 2:
The restraining component is segmented into functional zones: weak areas that deform with expanding cells and strong areas that maintain restraining force. This segmentation allows the component to simultaneously achieve deformation compatibility and force maintenance across different locations.
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 solution improves the battery's reliability and extends its service life by allowing the restraining component to deform with the battery cells, reducing debonding and maintaining effective restraining forces, thus preventing failure and ensuring consistent performance.
Implementation Method 1
the weak area is configured to allow the restraining component to be deformed when being subjected to an expansion force of each battery cell
Data Source
AI summary
A battery and a power consuming device are provided. 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, wherein the battery module includes a plurality of battery cells arranged in a first direction (X); and a restraining component, configured to cover the battery module and fixed to the fixed beams, wherein the restraining component is provided with a weak area, and the weak area is configured to allow the restraining component to be deformed when being subjected to an expansion force of each battery cell.