Battery Module Connecting Assembly for Pole Post Displacement Control
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Solution Overview
Problem
Battery cells in a module generate expansion forces during charging and discharging, causing bending deformation of end plates and displacement of pole posts, leading to potential damage due to shear force or torque.
Innovation Solution
A battery module design with a connecting assembly that connects first and second pole posts of adjacent battery cells using first and second connecting members, ensuring synchronized displacement and maintaining consistent distance and force, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery cells are mounted inside a mounting frame without additional connecting members, then the structure is simple, but the pole posts are prone to damage due to bending deformation of end plates under expansion force
Solution Approach 1:
The connecting assembly is segmented into multiple types of connecting members: first connecting members connect adjacent battery cells along the first direction, while second connecting members connect battery cells along the second direction. This segmentation allows each connecting member to specifically address local deformation issues, improving pole post protection without requiring a completely complex unified structure.
Solution Approach 2:
Different connecting members are applied at different locations based on local deformation characteristics. First connecting members are used where battery cells expand along the first direction, while second connecting members are used where expansion occurs along the second direction. This localized approach optimizes protection effectiveness while minimizing unnecessary structural complexity.
2Stability of the object's composition
If end plates are made more rigid to resist bending deformation, then pole post stability improves, but the expansion force from battery cells cannot be effectively accommodated
Solution Approach 1:
The connecting members are designed with flexible connection characteristics that allow dynamic adjustment during battery cell expansion. Rather than using rigid fixed connections, the connecting members can elastically deform and adapt to the changing dimensions of battery cells during charging and discharging cycles, maintaining pole post stability while accommodating expansion forces.
Solution Approach 2:
The connecting members act as intermediary elements between the battery cells and the mounting frame. They mediate the interaction by providing a compliant connection that transfers expansion forces in a controlled manner, preventing direct transmission of large expansion forces to the end plates while maintaining adequate pole post positioning stability.
Data Source
AI summary
A battery module and a battery pack are provided. The battery pack includes a mounting frame, a battery cell assembly, and a connecting assembly. The battery cell assembly includes two battery cell groups distributed inside the mounting frame along a first direction. Each of the two battery cell groups includes a plurality of battery cell units distributed along a second direction. Each of the battery cell units includes two battery cells distributed along the second direction. Each of the battery cells includes a first pole post and a second pole post distributed along the first direction. First pole posts of adjacent two of the battery cells distributed along the first direction are connected by a corresponding one of first connecting members. Second pole posts of the two battery cells of each of the battery cell units are connected by a corresponding one of second connecting members.