Battery Cell Tab Recess Structure for Flatness and Insulation
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Solution Overview
Problem
The provision of a tab in battery cells increases the thickness of the battery cell at the connection region with the electrode plate, affecting the structural flatness and safety of the battery.
Innovation Solution
A battery cell design featuring first and second electrode plates with recesses formed by the absence of active substance layers, where the first tab is disposed in the first recess and the second recess is reinforced with an insulation holding member, reducing the overall thickness and improving structural flatness and safety by minimizing the impact of the tab on the battery cell's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a tab is provided in the battery cell for electrical connection, then electrical connectivity is improved, but the thickness of the battery cell increases at the tab connection region, affecting structural flatness
Solution Approach 1:
The tab is positioned in a recess that extends in the thickness direction, utilizing the Z-dimension to accommodate the tab while maintaining the top surface flatness. This dimensional approach allows the tab to be electrically connected without protruding from the battery cell's outer surface, thus resolving the contradiction between electrical connectivity and structural flatness.
Solution Approach 2:
The recess is formed locally at the tab connection region, creating a localized thickness variation that accommodates the tab. This local modification allows the tab to be embedded without increasing the overall battery cell thickness, maintaining structural flatness while ensuring proper electrical connection.
2Shape
If the battery cell thickness is reduced to improve structural flatness, then structural flatness is improved, but the strength and thickness of the electrode plate at the tab region may be compromised
Solution Approach 1:
The tab is nested within the recess, which is formed by the absence of active substance layer. This nesting structure allows the tab to be accommodated within the electrode plate structure without compromising the overall strength, as the recess is strategically positioned to minimize structural impact while maintaining electrode plate integrity.
Solution Approach 2:
The recess is pre-formed in the electrode plate structure before tab installation, allowing the tab to be properly positioned and secured. This preliminary structural preparation ensures that the electrode plate maintains its strength while accommodating the tab, preventing structural weakness at the connection point.
3Shape
If the active substance layer is removed to form a recess, then the recess structure is created for tab accommodation, but the active substance quantity is reduced
Solution Approach 1:
The active substance layer is selectively extracted only in the specific region where the recess is needed for tab accommodation. This selective extraction minimizes the loss of active substance while creating the necessary recess structure, maintaining the majority of the active substance for battery function.
Solution Approach 2:
The removal of active substance is localized only to the recess region, leaving the rest of the active substance layer intact. This local modification approach ensures that the recess structure is created with minimal impact on the total active substance quantity, preserving battery capacity.
Data Source
AI summary
A battery cell including a first electrode plate and a second electrode plate alternately stacked, where a separator is disposed there between. The first electrode plate includes a first current collector and a first active substance layer. The second electrode plate includes a second current collector and a second active substance layer. The first electrode plate further includes a first recess formed by absence of the first active substance layer on the surface of the first current collector and a first tab disposed in the first recess. The second electrode plate includes a second recess formed by absence of the second active substance layer. In a thickness direction of the battery cell, the first recess and the second recess are arranged opposite to each other. A first insulation layer is disposed on a surface of the first tab, and the second recess is provided with a first insulation holding member.