Battery Module Connecting Assembly for Pole Post Displacement
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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 from shear and torsion forces.
Innovation Solution
A battery module design with a connecting assembly that synchronously connects first and second pole posts of adjacent battery cells using first and second connecting members, maintaining consistent distance and force between them, preventing damage from expansion-induced displacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery cells are mounted in a mounting frame without additional connecting members, then the structure is simple, but the pole posts generate great displacement and are prone to damage from shear force or torque
Solution Approach 1:
The connecting assembly is segmented into multiple first connecting members and second connecting members. Each first connecting member connects adjacent first pole posts, while each second connecting member connects second pole posts of battery cells in the same battery cell unit. This segmentation allows the system to handle expansion forces distributed across multiple connection points, preventing concentrated stress on single pole posts.
Solution Approach 2:
The patent combines multiple connecting functions into a single integrated connecting assembly that simultaneously performs electrical connection and mechanical constraint. The first connecting members and second connecting members work together to synchronously displace pole posts, merging the functions of electrical connectivity and structural support into one unified system.
2Strength
If end plates are made more rigid to resist bending deformation, then pole post displacement is reduced, but the anti-deformation ability of middle parts remains weak and complexity increases
Solution Approach 1:
Instead of making the entire end plate uniformly rigid, the patent applies local reinforcement through connecting members at specific locations where pole posts are positioned. The first connecting members connect first pole posts of adjacent battery cells, and second connecting members connect second pole posts, providing localized structural support exactly where expansion forces are transmitted to the end plates.
Solution Approach 2:
The connecting members act as intermediary elements between the battery cells and the end plates. Rather than directly reinforcing the end plates, the connecting members mediate the transmission of expansion forces, distributing them across multiple connection points and reducing the burden on any single end plate region.
3Use of energy by moving object
If battery cells are allowed to expand freely during charging and discharging, then energy efficiency is maintained, but expansion force causes bending deformation and pole post displacement
Solution Approach 1:
The connecting assembly is designed to be dynamically responsive to battery cell expansion. The first connecting members and second connecting members allow controlled movement and synchronous displacement of pole posts during charging and discharging cycles, accommodating the dynamic expansion and contraction of battery cells while maintaining structural integrity.
Solution Approach 2:
The connecting members are pre-installed to provide preliminary constraint against expansion-induced displacement. By establishing connection paths before expansion occurs, the system pre-configures the force transmission pathways that will counteract bending deformation and pole post displacement during subsequent charging and discharging operations.
Data Source
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AI summary
A battery module (100) and a battery pack are provided. The battery pack (100) includes a mounting frame (110), a battery cell assembly (120), and a connecting assembly (130). The battery cell assembly (120) includes two battery cell groups along a first direction (X). Each of the two battery cell groups (121) includes battery cell units (1210) distributed along a second direction (Y). Each of the battery cell units (1210) includes two battery cells. Each of the battery cells (1211) includes a first pole post (1212) and a second pole post (1213). First pole posts (1212) of adjacent two of the battery cells (1211) are connected by a corresponding one of first connecting members (131). Second pole posts (1213) of the two battery cells (1211) of each of the battery cell units (1210) are connected by a corresponding one of second connecting members (132).