Battery Module Welding Fixture for Hanging Lug Positioning
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Solution Overview
Problem
The assembly of power battery modules in new energy vehicles faces low accuracy due to the inability to ensure the flatness of hanging lugs, as traditional positioning references, such as the bottoms of the battery modules, fail to maintain the required flatness, leading to defects in the assembly process.
Innovation Solution
A welding positioning fixture is designed with a support device, first lateral-pressing devices, and a downward-pressing device to position battery modules, allowing the hanging lugs to float and abut against positioning surfaces, ensuring the flatness and accuracy of the assembly by using a combination of bearing platforms, floating mechanisms, and adjustable lateral-pressing devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bottom of the battery module is used as the positioning reference during assembly, then the assembly process is simple, but the flatness of the hanging lugs cannot be well guaranteed, resulting in low assembly accuracy
Solution Approach 1:
The patent introduces a positioning fixture as an intermediary tool between the battery modules during assembly. This fixture includes positioning surfaces that directly contact the hanging lugs, serving as a mediator to establish accurate relative positions without relying on the module bottoms as references. The positioning fixture transfers and maintains the required positional relationship, solving the contradiction by decoupling the simplicity of direct bottom-to-bottom positioning from the need for precise hanging lug alignment.
2Stability of the object's composition
If the battery modules are constrained in the first direction, then the positioning structure is stable, but the hanging lugs cannot abut against the first positioning surfaces, reducing positioning accuracy
Solution Approach 1:
The patent applies the dynamics principle by designing the support device with a floating mechanism that allows the battery modules to move freely in the first direction (vertical direction) while maintaining stability in other directions. The floating mechanism provides dynamic adaptability, enabling the modules to automatically adjust their position to make the hanging lugs contact the positioning surfaces, thereby achieving both structural stability and positioning accuracy simultaneously.
Data Source
AI summary
A welding positioning fixture includes a support device, two first lateral-pressing devices and a downward-pressing device. Two battery modules float along a first direction, the two first lateral-pressing devices are pressed on the first sides of the battery modules respectively, and the downward-pressing device is used for positioning the battery modules along the first direction. Each first lateral-pressing device has a first positioning surface. When the first positioning surfaces of the two first lateral-pressing devices are moved to the same preset height, and a second positioning surface is pressed on top sides of the two battery modules, the two battery modules can float in the first direction so that the hanging lug of each battery module abuts against the corresponding first positioning surface.