Insulating Compression Pad Assembly for Pouch Cell Battery Modules
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Solution Overview
Problem
Conventional battery modules face challenges in ensuring insulation for the outermost cell of a cell stack and experience defects during assembly due to interference between the cell stack and frame member, particularly with pouch-type cells where the sealing portion is vulnerable to insulation issues.
Innovation Solution
A battery module design featuring compression pads made of a laminate of elastic pads and synthetic resin films, where the length extension portion of the synthetic resin film covers and protects the upper surface of the cell stack, minimizing exposed cutting surfaces and eliminating the need for additional insulators, thus enhancing insulation and simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an eaves-shaped film is added to protect the edge of the cell stack, then insulation is improved, but the film is vulnerable to interference during assembly which causes deformation or damage
Solution Approach 1:
The patent combines the insulating film and the protective edge structure into a single integrated compression pad assembly. The film is attached to the compression pad that already exists in the battery module, merging two functions (insulation and edge protection) into one component system, thereby eliminating the need for a separate eaves-shaped film that would interfere with assembly
Solution Approach 2:
The compression pad serves as an intermediary structure that holds the insulating film in place and provides the necessary protection during assembly. Instead of using a fragile eaves-shaped film directly, the compression pad acts as a mediator that protects both the cell stack and the film during the assembly process
2Reliability
If additional insulators are inserted into the frame member to ensure insulation, then insulation is improved, but the device complexity increases
Solution Approach 1:
The compression pad is designed to serve multiple functions simultaneously: it provides mechanical compression to maintain cell contact, acts as a structural support element, and serves as a mounting base for the insulating film. This multi-functionality eliminates the need for separate insulator components, thereby reducing device complexity while maintaining insulation performance
Solution Approach 2:
The patent merges the insulating function with the existing compression pad structure by attaching the film to it. This consolidation eliminates the need for additional separate insulator components that would increase device complexity, achieving insulation enhancement through integration rather than addition
3Productivity
If the pouch-type cell is used to achieve high integration, then productivity is improved, but the sealing portion becomes vulnerable to insulation issues
Solution Approach 1:
The patent applies local quality enhancement by specifically addressing the vulnerable sealing portion of the pouch-type cell. The insulating film is strategically positioned and attached to the compression pad at the locations where insulation is most needed (particularly at the sealing portions and edges), providing targeted insulation protection without compromising the high integration benefits of pouch-type cells
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 effectively ensures improved insulation for the outermost cell, reduces assembly defects, and maintains the structural integrity of the battery module by using compression pads that absorb swelling and external impacts, while eliminating the need for additional insulators, thereby enhancing the overall assembly process and insulation performance.
Implementation Method 1
a buffer member 30 is provided between the cell stack 10 and the case 22. The buffer member 30 is compressed according to the expansion of the cell due to swelling to absorb the swelling
Implementation Method 2
the compression pad is a laminate of an elastic pad and a synthetic resin film attached to at least one surface of the elastic pad
Data Source
AI summary
A battery module includes a cell stack in which a plurality of cells are stacked; and a compression pad provided on an outer surface of the cell stack, wherein the compression pad is a laminate of an elastic pad and a synthetic resin film attached to at least one surface of the elastic pad. The synthetic resin film includes a length extension portion longer than the elastic pad in length, and the length extension portion is folded to cover and protect the upper surface of the cell stack.