Secondary Battery Electrode Plate Tab Assembly Recessed Welding
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Solution Overview
Problem
Existing secondary battery electrode plates lack a stable connection between conductive layers, leading to ineffective current collection and reduced connection strength, which affects the battery's performance and energy density.
Innovation Solution
The electrode plate design includes a current collector with an insulation layer, a first conductive layer, and a second conductive layer, along with a tab assembly featuring recessed regions for welding, which ensures a firm electrical connection between the layers and reduces the number of welding layers, thereby enhancing connection strength and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal foils are arranged on the first conductive layer and the second conductive layer to shunt currents, then current collection is achieved, but the connection structure becomes complex and connection strength is insufficient
Solution Approach 1:
The patent merges the first conductive layer and the second conductive layer by directly connecting them through the insulation layer without requiring separate metal foils for current shunting. This integration simplifies the structure while ensuring reliable electrical connection between the conductive layers, thereby improving connection strength and reducing structural complexity simultaneously.
2Strength
If multiple welding layers are used to connect tabs to current collector, then connection strength is improved, but volumetric energy density decreases
Solution Approach 1:
The patent extracts and eliminates redundant welding layers from the tab assembly structure. By designing the tabs to directly contact and weld to the conductive layers without requiring multiple intermediate welding layers, the connection strength is maintained through optimized direct contact, while the removed layers increase volumetric energy density by reducing overall battery volume.
3Reliability
If the insulation layer is non-conductive, then electrical isolation is achieved, but current conduction between conductive layers becomes difficult
Solution Approach 1:
The patent applies local quality by creating localized conductive pathways through the insulation layer at specific positions where the first and second conductive layers need to connect. The insulation layer maintains its non-conductive properties in most areas to provide electrical isolation, while localized regions are designed with conductive characteristics to enable current flow between conductive layers, thus achieving both electrical isolation and current conduction efficiency.
Data Source
AI summary
Provided are an electrode plate of a secondary battery, a preparation method thereof, and a secondary battery, which belong to the field of the secondary battery technologies. The electrode plate includes a current collector and a tab assembly. The tab assembly includes a first tab including a first current collector connection region that covers and is connected to an outer surface of the first conductive layer and a second tab. The first tab includes a first current collector connection region that covers and is connected to an outer surface of the first conductive layer, and the second tab includes including a second current collector connection region that covers and is connected to an outer surface of the second conductive layer. A first recessed region is defined at a connection between the tab assembly and the current collector. In the first recessed region, the first current collector connection region of the first tab and the first conductive layer are stacked with each other and both embedded in the insulation layer, and each of the first current collector connection region and the first conductive layer has a recessed outer surface. The first conductive layer is electrically connected to the second conductive layer in the first recessed region.