Battery Pack End Panel Fixing by Stack Compression Force
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Solution Overview
Problem
Conventional battery packs with extendable binding bars to accommodate individual differences in battery stack length are costly due to increased parts and complex assembly processes.
Innovation Solution
A battery pack design that fixes the battery stack using the compression reaction force of the stack itself, eliminating the need for fastening or bonding, and a method involving compression and alignment of the stack within a case member with integrated end wall and mounting parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If binding bars with extendable mechanisms are used to accommodate individual differences in battery stack length, then the battery pack can maintain appropriate pressure, but the number of parts increases and production costs increase
Solution Approach 1:
The invention extracts and eliminates the extendable mechanism from the binding bar, replacing it with a simple panel member that is pressed against the battery stack. This removes the complex extendable function while maintaining the essential pressure-maintaining function through a much simpler structure.
Solution Approach 2:
The battery stack itself serves to maintain pressure on the panel member through its own structural integrity, eliminating the need for active extendable mechanisms. The system uses the battery stack's inherent properties to achieve pressure maintenance without additional complex components.
2Reliability
If binding bars with extendable mechanisms are used to accommodate individual differences in battery stack length, then the battery pack can maintain appropriate pressure, but the assembly process becomes more complex
Solution Approach 1:
The invention removes the extendable mechanism and its associated locking parts, leaving only a simple panel member that can be easily installed. This extraction of unnecessary complexity directly simplifies the assembly process while preserving the pressure maintenance function.
Solution Approach 2:
Instead of using an active extendable mechanism that requires adjustment and locking, the invention uses a passive panel member that is simply pressed into place. This inverts the approach from active adjustment to passive fixation, greatly simplifying assembly.
3Strength
If additional fastening or bonding means are used to fix the end panel, then the structural integrity is improved, but the production cost increases
Solution Approach 1:
The battery stack itself provides the fixing function through its compression force, eliminating the need for additional fastening or bonding means. The system uses the battery stack's inherent compression to secure the panel, achieving structural integrity without extra components or processes.
Solution Approach 2:
The invention extracts and eliminates fastening or bonding means from the assembly, relying solely on the compression force between the battery stack and panel member. This removal of unnecessary components reduces production cost while maintaining structural integrity through the compression mechanism.
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
Reduces production costs by simplifying assembly and eliminating the need for additional fixing components, while maintaining structural integrity and alignment of battery cells.
Implementation Method 1
inserting the battery stack into the case member while compressing the battery stack in the stacking direction
Implementation Method 2
the end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack
Data Source
AI summary
A battery pack includes a battery stack including a plurality of battery cells and a case member in which the battery stack is housed. The case member includes an end wall part located on one end of the battery stack in a stacking direction and continuously integrated with a floor part, and a mounting-shape part located on an opposite end from the end wall part and configured to mount a panel-shaped member. The battery stack is retained in the case member while being held by compression between the end wall part and the end panel on the other end. The end panel is pressed against the mounting-shape part in a direction away from the end wall part by compression reaction force of the battery stack, and fixed therein.