Battery Pack Module Fastening for Tolerance Compensation
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Solution Overview
Problem
Existing battery pack fastening arrangements face issues with tolerance differences between battery modules and pack covers, leading to thread wear and unfastening, as well as complex assembly and removal processes.
Innovation Solution
A fastening device comprising a fixating member with perpendicular fasteners that compensates for tolerance differences by using a first fastener to secure the fixating member to the battery pack cover and a second fastener to secure it to the battery module, preventing momentum-induced unfastening and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tolerance compensating screw is arranged on the opposite side of the battery pack cover to compensate for tolerance differences, then the battery module can be fixed to the battery pack cover, but momentum is introduced along the fastener axis causing thread wear and unfastening
Solution Approach 1:
The invention transitions from a single-axis fastening approach to a multi-dimensional fastening system. The first fastener fastens in a first direction while the second fastener fastens in a second direction perpendicular to the first direction, distributing forces across multiple dimensions and eliminating momentum-induced thread wear along a single axis
Solution Approach 2:
The fastening function is divided into two separate fasteners with different orientations. The first fastener handles primary fastening in the first direction, while the second fastener provides secondary fastening in the perpendicular second direction, separating the fastening actions to prevent cumulative stress on a single fastener axis
2Manufacturing precision
If a tolerance compensating screw is used to fasten the battery module to the battery pack cover, then tolerance differences can be compensated, but assembly and removal of the battery module becomes complicated
Solution Approach 1:
By introducing a second fastening direction perpendicular to the first fastening direction, the invention creates a modular fastening system where the battery module can be assembled and disassembled in a straightforward two-step process, simplifying operations while maintaining tolerance compensation capabilities
Solution Approach 2:
The assembly process is segmented into two independent fastening actions: first fastening in the first direction, then fastening in the perpendicular second direction. This segmentation makes the assembly and removal processes more systematic and simpler compared to using a single complex tolerance compensating screw
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 compensates for tolerance differences without risking unfastening and simplifies the assembly process by using threaded fasteners to maintain tight contact without additional parts, ensuring secure and efficient attachment of battery modules to the pack cover.
Implementation Method 1
the first fastener comprises a first threaded fastener, and the fixating member comprises a first threaded aperture for receiving the first threaded fastener
Implementation Method 2
the second fastener comprises a second threaded fastener, and the fixating member comprises a second threaded aperture for receiving the second threaded fastener
Data Source
AI summary
A fastening device configured to fasten a battery module to a battery pack cover. The fastening device includes a fixating member adapted to be received within, and protrude from, a recess of the battery module, a first fastener adapted to fasten the fixating member to the battery pack cover and a second fastener adapted to fasten the fixating member to the battery module, for securement within the recess of the battery module. A fastening direction of the first fastener is perpendicular to a fastening direction of the second fastener, and the first fastener is configured to move the fixating member into contact with the battery pack cover.