Elastic Fixing Strap for Battery Module Expansion Restraint
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Solution Overview
Problem
Existing battery modules in new energy vehicles face expansion and deformation issues during charging and discharging, leading to potential damage from shear forces caused by fixing straps, which can result in failure.
Innovation Solution
A battery module design featuring a strap-shaped body surrounding the batteries and end plates with an elastic fixing part, such as a spring, that provides a gap for expansion while maintaining restraint, preventing damage from shear forces and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a fixing strap is used to fix the end plate and the plurality of batteries, then the expansion of the battery is suppressed, but an interfering restraint will be caused between the fixing strap and the plurality of batteries, producing a shear force that may damage the plurality of batteries
Solution Approach 1:
The fixing strap changes from a rigid structure to a flexible structure that can dynamically adjust its constraints. The strap is configured to be flexible in the first direction (perpendicular to battery stacking) to suppress expansion, while remaining relatively fixed in the second direction (parallel to stacking), creating anisotropic flexibility that adapts to battery deformation patterns without generating harmful shear forces
Solution Approach 2:
The fixing strap transitions from a static rigid constraint to a dynamic flexible constraint that can adapt to changing battery dimensions during charge-discharge cycles. The flexibility allows the strap to accommodate expansion and deformation dynamically, preventing the generation of damaging shear forces while maintaining stabilizing pressure
2Reliability
If a rigid fixing strap is used to restrain the battery module, then the reliability of battery performance is improved, but the battery module cannot accommodate expansion and deformation during charging and discharging
Solution Approach 1:
The fixing strap's mechanical properties are changed from rigid to flexible, allowing it to maintain reliable restraint while adapting to dimensional changes. The strap's flexibility parameter enables it to stretch and conform to battery expansion, while its anchoring to end plates maintains overall structural reliability
Solution Approach 2:
The fixing system transitions from a static rigid structure to a dynamic flexible structure that continuously adapts to battery module deformation. The strap can dynamically adjust its tension and position during charge-discharge cycles, maintaining reliable performance constraints while accommodating necessary expansion
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 elastic fixing part allows for controlled expansion and deformation of the battery module, suppressing displacement and deformation while preventing damage from shear forces, thereby enhancing the reliability and performance of the battery module.
Implementation Method 1
The elastic fixing part is a spring, and two ends of the spring are respectively connected to two ends of the strap-shaped body to form a closed fixing strap
Data Source
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AI summary
The present disclosure provides a battery module. The battery module includes a plurality of batteries that are stacked and two end plates disposed at two ends of the plurality of batteries in a stacking direction of the batteries. The battery module further includes a fixing strap, which includes a strap-shaped body and an elastic fixing part. The strap-shaped body surrounds the plurality of batteries and the end plates and defines a gap. The elastic fixing part is disposed in the gap and connected to the strap-shaped body. The elastic fixing part, together with the strap-shaped body, can provide an expansion space for the battery module with a certain restraint. In this way, the deformation of the battery module can be suppressed, and the battery module is protected from being damaged by a shear force of the strap-shaped body, thereby improving reliability of the battery performance.