Battery Binding Bar Shear Stress Resistance
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Solution Overview
Problem
The existing power supply devices with battery stacks face deformation or damage due to the large loads applied by rectangular battery cells experiencing dimensional variations during charging/discharging or degradation, as the binding bars and end plates are not adequately designed to handle these expansions.
Innovation Solution
The power supply device incorporates plate-shaped binding bars with engagement blocks that are fixed to end plates, providing increased coupling strength and preventing deformation by guiding engagement blocks to fitting parts and using stoppers to secure them, thus resisting shear stress rather than tensile stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If binding bars and end plates are used to assemble battery cells, then the battery cells are securely held together, but large loads are applied to the binding bars and end plates causing deformation or damage
Solution Approach 1:
The binding bar is divided into a plate-shaped bar portion and a protruding engagement block portion. This segmentation allows the engagement block to protrude from the end plate and engage with the battery cell, distributing the load more effectively and reducing deformation of the main binding bar structure.
Solution Approach 2:
The engagement block protrudes in a direction extending from the outer peripheral face of the end plate, adding a dimensional element that increases coupling strength between the end plate and battery cell. This protruding structure creates a more robust connection that better resists the expansion forces of the battery cells.
2Quantity of substance
If rectangular battery cells increase energy density, then energy storage capacity improves, but dimensional variation during charging/discharging increases causing larger loads on binding bars and end plates
Solution Approach 1:
The binding bar material parameters are changed by using a metal material with high strength-to-weight ratio and appropriate elasticity. This allows the binding bar to withstand the larger expansion forces from high energy density battery cells while maintaining structural integrity and preventing deformation.
3Strength
If engagement blocks are fixed to end plates with increased coupling strength, then deformation is prevented, but device complexity increases
Solution Approach 1:
The engagement block is integrally formed with the plate-shaped bar portion as a single piece. This merging of components simplifies the assembly process by reducing the number of separate parts that need to be assembled, while still providing the increased coupling strength needed to prevent deformation of the end plates.
Data Source
AI summary
A power supply device disposes an end plate at each end of a battery stack in a stacked direction of the battery stack, and couples a binding bar to the end plate, so as to fix battery cells. The binding bar includes a plate-shaped bar that extends in the stacked direction, and an engagement block that is provided on a plate-shaped bar and protrudes toward an outer peripheral face of the end plate. The engagement block is inserted into a fixing hole provided in the plate-shaped bar and fixed to an inner peripheral face of the fixing hole. The end plate includes a fitting part, to which the engagement block is guided, on the outer peripheral face of the end plate, and includes a stopper that is disposed closer to the battery stack with respect to the fitting part and abuts the engagement block.