Battery Cell Connection Structure with Inclined Tabs
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Solution Overview
Problem
Existing battery cell connection structures face issues with gaps between cells when the cell thickness is relatively thin, as conventional screw-fastening methods fail to ensure proper contact due to the thinness relative to the screw width.
Innovation Solution
A battery cell connection structure where positive and negative electrode tabs are bent to be inclined with respect to the stacking direction, allowing them to be connected in the thickness direction, thereby reducing the distance between cells and ensuring reliable contact without interference from screw tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If screw-fastening method is used to connect battery cells, then connection strength is improved, but gap is generated between thin battery cells
Solution Approach 1:
The connection structure is segmented into multiple components: electrode tabs, tab holders, and pressing plates. The electrode tabs are divided into first and second tabs that can be bent independently, allowing each segment to contribute to eliminating gaps between cells while maintaining connection strength through the combined action of multiple elements.
Solution Approach 2:
The electrode tabs are bent in advance to a predetermined shape before assembly, creating a pre-compression structure. This preliminary bending action ensures that when the tab holder and pressing plates are assembled, the tabs are already positioned to eliminate gaps between battery cells, preventing gap formation rather than correcting it afterward.
2Length of moving object
If electrode tabs are bent to be inclined, then distance between battery cells is shortened, but manufacturing complexity increases
Solution Approach 1:
The electrode tabs are designed with dynamic bending capability, allowing them to be bent to inclined angles during assembly. The tab holder structure accommodates these bent tabs through a pressing mechanism that applies force to maintain the inclined position, enabling the system to adapt to the shortened distance between cells while managing the added manufacturing complexity through a controllable pressing process.
Data Source
AI summary
In a battery cell connection structure for connecting two rectangular battery cells in series in a state where the two battery cells are stacked in the thickness direction thereof, a positive electrode tab of one of the battery cells and a negative electrode tab of the other of the battery cells are connected to each other in a state where the positive electrode tab and the negative electrode tab are stacked in the thickness direction while the positive electrode tab and the negative electrode tab are inclined with respect to a direction in which the two battery cells are stacked.