Battery Pack Fastening System for Cartridge Alignment
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Solution Overview
Problem
The existing battery pack assembly process faces challenges with assemblability, processability, and durability due to misalignment of end plates and bolts, leading to improper stacking and potential damage during assembly, which affects the stability and security of the stacked structure of cartridges.
Innovation Solution
A battery pack design featuring a lower end plate with a first fastening member and an elongated second fastening member, where the second fastening member is perpendicular to the lower end plate and passes through coupling holes of cartridges, allowing for precise and stable stacking without the need for welding, thus preventing deformation and ensuring secure coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the angle between the end plate and the bolts is not a right angle, then the bolts may not be easily inserted into the cartridge holes, but adjusting the angle to precisely stack the cartridges may cause the bolts or end plate to be broken or deformed
Solution Approach 1:
The guide pins are installed on the end plates before the assembly process to pre-establish the correct positioning and right-angle orientation for bolt insertion. This preliminary action ensures that subsequent assembly operations proceed without angle misalignment, preventing both imprecision and structural damage.
Solution Approach 2:
The guide pins act as intermediary elements between the end plates and the bolts, providing a physical reference that ensures proper angular alignment. These guide pins mediate the assembly process by guiding bolt insertion at the correct angle, thereby maintaining both precision and structural integrity.
2Manufacturing precision
If the bolts are inserted at an incorrect angle, then the cartridges may not be precisely stacked, but forcing precise stacking by adjusting the angle may lead to broken or deformed bolts and end plates
Solution Approach 1:
The guide pins enable the assembly process to be self-aligning, where the physical structure itself guides the correct positioning and angular orientation of components during assembly. This eliminates the need for complex external alignment tools or procedures, maintaining ease of manufacture while ensuring high precision.
3Ease of operation
If the angle between end plate and bolts is not a right angle, then the assemblability and quality of the battery pack deteriorate, but maintaining a right angle may require complex adjustment processes
Solution Approach 1:
The alignment and angular control functions are extracted from the main assembly structure and embodied as separate, simple guide pin components. This extraction allows the main assembly process to remain simple and straightforward while the guide pins handle the complex angular positioning requirement, thus improving ease of operation without significantly increasing overall device complexity.
Data Source
AI summary
The present disclosure relates to a battery pack having improved assemblability, processability, and durability, and configured to stably maintain a stack of cartridges. According to an aspect of the present disclosure, the battery pack includes: vertically arranged secondary cells each including an electrode assembly, an electrolyte, and a pouch-type case; vertically stacked cartridges accommodating the secondary cells in inner spaces thereof and including coupling holes; a lower end plate including a plate-shaped metallic material and placed on a lower portion of a stack of the secondary cells and the cartridges; a first fastening member fixed to the lower end plate; and a second fastening member having an elongated shape so as to stand on the lower end plate in a direction perpendicular to the lower end plate, a lower end portion of the second fastening member coupled to the first fastening member, the second fastening member being inserted through coupling holes of the cartridges.