Battery Cell Terminal Post Hole for Compact Tab Connection
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Solution Overview
Problem
The existing battery designs with longer tabs for connection and assembly with the battery terminal post occupy a larger space, reducing the energy density of the battery.
Innovation Solution
A battery cell design featuring a connecting hole in the terminal post with an inclined inner plane, where the tab is fixed and connected to this plane, minimizing space occupation and weight, thereby improving energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the tab is made longer for connection and assembly with the terminal post, then the connection reliability is improved, but the space occupied by the tab increases, reducing the energy density of the battery
Solution Approach 1:
The tab is nested within the connecting hole of the terminal post, with the connecting hole having a diameter larger than the tab width to accommodate it. This nesting arrangement allows the tab to be received inside the terminal post structure, significantly reducing the external space occupied by the tab while maintaining the electrical connection function.
Solution Approach 2:
The connecting hole transitions from a simple cylindrical hole to one with an inclined plane surface, adding a dimensional feature that enables the tab to be securely positioned at an angle. This dimensional change allows the tab to be held firmly within the terminal post while minimizing the space required for connection.
2Reliability
If the tab is made longer to ensure stable connection, then the connection stability is improved, but the weight of the tab increases, reducing the energy density of the battery
Solution Approach 1:
The tab is received within the connecting hole of the terminal post, nesting the connection structure within the existing terminal post geometry. This eliminates the need for additional tab length extending beyond the terminal post, reducing tab weight while maintaining stable electrical connection through the nested arrangement and inclined plane support.
3Ease of manufacture
If the tab connection structure is simplified, then the manufacturing complexity is reduced, but the connection reliability may be compromised
Solution Approach 1:
The connecting hole is segmented into distinct functional zones: an upper inclined plane surface for tab positioning and support, and a lower cylindrical portion for receiving the tab. This segmentation of the connecting hole structure provides reliable tab connection through the inclined plane while maintaining manufacturing simplicity by forming these features within a single molded terminal post component.
Data Source
AI summary
A battery cell comprises: a case comprising a first wall; a terminal post arranged on the first wall and provided with a connecting hole passing through the terminal post, wherein at least part of the inner peripheral wall of the connecting hole is formed as a first inclined plane, and the first inclined plane is obliquely arranged relative to the axis of the connecting hole; and an electrode assembly comprising an active material coating portion and a tab, wherein the active material coating portion is arranged in the case, the tab is electrically connected to the active material coating portion, and at least part of the tab extends into the connecting hole and is connected to the first inclined plane.