Battery Pack Constraint Structure for Cover Deformation Control
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Solution Overview
Problem
The existing battery packs face issues with deformation of the outer cover during charging and discharging, leading to reduced sealing performance and difficulty in removal and reinstallation due to poor rigidity, which can cause moisture ingress and short circuits.
Innovation Solution
The battery pack incorporates a constraint component fixed with a beam to provide a stable pressing force, reducing expansion deformation and improving sealing, while also allowing for easier removal and installation by dividing battery units into groups with increased fixing points and a latticed structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the outer cover is made with poor rigidity to facilitate removal and installation, then the ease of operation is improved, but the sealing performance deteriorates and moisture ingress occurs
Solution Approach 1:
The battery pack structure is divided into modular components: the outer cover, box assembly, constraint component, and battery units. This segmentation allows the outer cover to be easily removed and installed while the internal constraint component maintains sealing integrity through its lattice structure and pressing force on sealing surfaces.
2Ease of operation
If the outer cover has poor rigidity to allow easy removal, then the ease of operation is improved, but deformation during charging and discharging increases leading to short circuits
Solution Approach 1:
The constraint component is pre-installed within the box assembly to provide preliminary support and constraint forces to the battery units before charging and discharging occur. This preliminary action prevents deformation of the outer cover during battery expansion and contraction, eliminating the risk of short circuits while maintaining ease of removal.
Solution Approach 2:
The constraint component acts as an intermediary between the battery units and the outer cover. It transfers and distributes the pressing force uniformly across the battery units, preventing direct deformation of the outer cover during charging and discharging cycles, thus avoiding short circuits.
3Reliability
If the battery units are constrained tightly to prevent deformation, then the reliability is improved, but the expansion deformation is restricted leading to increased stress
Solution Approach 1:
The constraint component features a lattice structure with varying local densities and pressing forces. This local quality variation allows tighter constraint in critical sealing areas to maintain reliability, while providing more space in non-critical areas to accommodate battery expansion, thereby reducing overall stress on the battery units.
Data Source
AI summary
A battery pack and a vehicle, wherein the battery pack includes a box assembly, a battery unit, a constraint component and an outer cover, the box assembly includes a box body and a fixed beam, the fixed beam is fixed in the box body; the battery unit is arranged in the box body; the constraint component covers the battery unit and is fixed with the fixed beam; and the outer cover is arranged on one side of the constraint component away from the box body to seal an open end of the box body.