Battery Module Fixing Bracket for Thin Bottom Plate Assembly
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Solution Overview
Problem
The assembly efficiency of restraining members in the bottom plate of electric vehicle battery packs is low due to the difficulty in positioning and configuring smaller components like nuts on thin aluminum plates, which do not meet the depth requirement for threaded holes.
Innovation Solution
A fixing device with a mounting bracket that extends into a cavity in the bottom plate, allowing for easier positioning of restraining members like nuts, without the need for special positioning structures, and using steel nuts to reduce the thread depth requirement, thereby improving assembly efficiency and allowing for thinner bottom plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If threaded holes are formed in the aluminum bottom plate to meet strength requirements, then the strength is improved, but the threaded hole depth requirement increases which cannot be met by thin bottom plates
Solution Approach 1:
The mounting bracket extends in the thickness direction of the bottom plate, utilizing the vertical dimension to achieve the required threaded hole depth without increasing the bottom plate thickness. The bracket protrudes from the bottom plate surface, allowing bolts to engage with nuts mounted on the bracket, thereby solving the depth limitation of thin bottom plates.
Solution Approach 2:
The mounting bracket serves as an intermediary component between the bottom plate and the battery module. It provides a platform for mounting nuts and allows the use of steel nuts with shorter threaded hole depths compared to aluminum nuts, thereby resolving the contradiction between strength requirements and bottom plate thickness.
2Strength
If restraining members like nuts are configured directly in the thin aluminum bottom plate, then the strength requirement can be met, but the positioning and assembly efficiency become low
Solution Approach 1:
The mounting bracket is pre-configured with positioning structures that extend into the bottom plate cavity. This preliminary positioning setup allows for easy and accurate placement of nuts on the bracket, significantly improving assembly efficiency compared to directly positioning small nuts in the thin bottom plate.
Solution Approach 2:
The mounting bracket acts as an intermediary that simplifies the positioning process. By providing a larger, more accessible mounting surface with integrated positioning features, it makes the assembly of restraining members much easier and more efficient than working directly with the thin bottom plate.
3Weight of moving object
If the bottom plate thickness is reduced, then the weight and manufacturing cost are reduced, but the threaded hole depth requirement cannot be met
Solution Approach 1:
Instead of increasing bottom plate thickness to meet threaded hole depth requirements, the solution extends the mounting structure in the vertical dimension through the protruding mounting bracket. This allows thin bottom plates to be used while still achieving sufficient threaded hole depth for strong connections.
Solution Approach 2:
The fixing system is segmented into multiple components: the thin bottom plate, the mounting bracket, and the nuts. This segmentation allows each component to be optimized independently - the bottom plate can be thin for weight reduction, while the bracket provides the necessary depth for strong mechanical connections.
Data Source
AI summary
The present disclosure relates to technical field of electric vehicles and provides fixing device for battery modules, battery pack, and vehicle having the battery pack. The battery module is mounted on bottom plate having first cavity by the fixing device, and the bottom plate is provided with first mounting hole penetrating through the cavity wall of the first cavity. The fixing device includes mounting bracket extending in the length direction of the first cavity to be disposed in the first cavity, the length of the mounting bracket being approximately equal to that of the first cavity; restraining member mounted on the mounting bracket; and fixing member penetrating through the first mounting hole to be fixed to the restraining member so as to fix the battery module to the bottom plate. Thus, it is possible to improve the assembly efficiency of the restraining member in the bottom plate.