Battery Module Middle Plate Assembly for Gap-Free Laser Welding
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Solution Overview
Problem
The middle plate in existing battery modules experiences spring-back deformation due to stamping and bending, leading to low fitting accuracy and large gaps between the middle plate and end plate, which can compromise the welding process and safety of the battery module.
Innovation Solution
A battery module design featuring a middle plate with a partition and connection portion arranged in a straight line, allowing for improved contour accuracy and reduced assembly gaps, combined with a light shielding structure on the partition portion to block laser penetration during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the middle plate is formed by stamping and bending a metal profile, then the middle plate can be manufactured with standard forming processes, but spring-back deformation occurs leading to low fitting accuracy and large gaps
Solution Approach 1:
The patent applies preliminary action by pre-compensating for spring-back deformation during the stamping and bending forming process. The middle plate is intentionally formed with predetermined deformation that counteracts the expected spring-back, ensuring that after forming completes and spring-back occurs, the final shape achieves the required fitting accuracy with the end plate assembly insertion hole.
2Ease of operation
If the middle plate is inserted into the end plate assembly, then assembly is simplified, but large gaps appear due to spring-back deformation affecting welding quality and safety
Solution Approach 1:
The patent uses preliminary action by pre-compensating for spring-back deformation during forming, so that when the middle plate is inserted into the end plate assembly, minimal gaps are present, ensuring good welding quality without requiring complex gap compensation measures during assembly.
3Manufacturing precision
If the middle plate is formed with high precision to reduce gaps, then welding quality improves, but the complexity of the forming process increases
Solution Approach 1:
The patent applies parameter changes by modifying the forming process parameters, specifically the stamping and bending parameters, to achieve the required contour accuracy. By optimizing these parameters, the middle plate achieves high fitting accuracy without requiring excessively complex forming equipment or processes.
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
Ensures enhanced assembly precision, reduces the risk of laser damage to internal components, and improves the overall safety and reliability of the battery module by minimizing gaps and shielding laser exposure.
Implementation Method 1
at least one side plate surface of the partition portion has a light shielding structure protruding from a plate surface of the connection portion
Data Source
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AI summary
A battery module and a battery pack are provided. The battery module includes two end plate assemblies (100) spaced apart in a first direction and a middle plate (200) connected between the two end plate assemblies (100). The middle plate (200) includes a partition portion (210) and a connection portion (220) distributed in a straight line in the first direction and in a same plane. The middle plate (200) is inserted into and fitted with the corresponding end plate assembly (100) at least through the connection portion (220). At least one side plate surface of the partition portion (210) has a light shielding structure (300) protruding from a plate surface of the connection portion (220). The light shielding structure (300) is arranged on at least one side plate surface of the partition portion (210).