Battery Module Fastening via Segmented Stacks and Anti-Rotation Bolts
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Solution Overview
Problem
Existing battery modules face challenges in maintaining dimensional stability due to the use of long bolts, which can deform the module under excessive force, and accumulated tolerance at welded portions between electrode tabs and bicells, leading to reduced durability and safety under external impacts or vibrations.
Innovation Solution
A battery module design featuring cartridges with through holes that communicate with end plates, using a fixing member with a horizontal sectional structure and protrusions to prevent rotation, ensuring stable fastening and maintaining thickness, along with a voltage detection assembly for monitoring overvoltage, overcurrent, and overheating, and a compact structure for improved assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If long bolts are used to fasten the battery module, then the fastening strength is improved, but the dimensional stability deteriorates due to deformation under excessive force
Solution Approach 1:
The battery module is divided into multiple stacks, with each stack independently fastened by short bolts to the end plate. This segmentation distributes the fastening load across multiple points rather than using fewer long bolts, preventing excessive force concentration that causes deformation while maintaining overall fastening strength.
Solution Approach 2:
Stacks serve as intermediary structures between the battery cells and the end plate. Instead of directly fastening cells with long bolts, the cells are organized into stacks that are then fastened to the end plate, providing structural mediation that maintains dimensional stability while achieving secure fastening.
2Ease of manufacture
If the battery module structure is simplified, then the manufacturing ease is improved, but the durability under external impact deteriorates
Solution Approach 1:
The battery module uses multiple short bolts instead of fewer long bolts, and organizes cells into discrete stacks. This segmented approach simplifies manufacturing by using shorter, easier-to-install fasteners while the distributed stack structure enhances durability by providing multiple independent support points that resist external impacts effectively.
Data Source
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AI summary
Disclosed herein is a battery module having a plurality of battery cells, the battery module including a cell module stack having a structure in which a plurality of cell modules having the battery cells mounted in cartridges is vertically stacked, a lower end plate to support a lower end of the cell module stack, and an upper end plate to fix an uppermost cartridge of the cell module stack disposed on the lower end plate, wherein the cartridges, the upper end plate, and the lower end plate are provided with through holes formed such that the through holes communicate with one another, a fixing member is inserted through the through holes and coupled to the upper end plate and the lower end plate, and the fixing member and the through holes are configured to have a horizontal sectional structure to restrain rotation of the fixing member when rotational force for fastening is applied to the fixing member.