Stacked Battery Current Collector Bending Without Tab Group Damage
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Solution Overview
Problem
The length of the tab group in secondary batteries can lead to unintended bending or curvature during manufacturing, potentially causing damage.
Innovation Solution
A method of manufacturing secondary batteries involves joining a first current collector with a first tab group to a first region and another conductive member to a second region, followed by bending the current collector between these regions, and applying a high-energy ray to join them, with optional pressing using a jig.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the length of the tab group is increased to achieve the bent structure, then the bending capability is improved, but the tab group may be damaged due to unintended bending or curvature during manufacturing
Solution Approach 1:
The current collector is divided into multiple metal plates stacked together, creating a segmented structure that can bend more controllably. This segmentation allows the long tab group to achieve the required bent shape while reducing the risk of damage during manufacturing processes.
Solution Approach 2:
The metal plates are joined together in advance to form a stacked current collector structure before the tab group is attached. This preliminary action creates a more stable and controllable bending structure that prevents unintended bending or damage to the tab group during subsequent manufacturing steps.
2Adaptability or versatility
If multiple metal plates are stacked to form the current collector, then the bending and joining flexibility is improved, but the manufacturing process complexity increases
Solution Approach 1:
The current collector is segmented into multiple metal plates that can be independently handled and joined. This segmentation provides flexibility in the joining process, allowing different regions of the current collector to be joined to different components (tab group in one region, other conductive members in another region) independently.
Solution Approach 2:
The stacked metal plate structure serves multiple functions: it provides electrical conductivity, enables bending to achieve the required shape, and allows selective joining to different components at different regions. This multi-functionality reduces the need for separate components and simplifies the overall manufacturing process despite the stacked structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method suppresses damage to the tab group by stabilizing the connection between the tab group and the current collector, ensuring a robust and durable structure.
Implementation Method 1
It is disclosed that a portion of the metal plate stack ultrasonically joined in advance is laser-welded to another conductive member.
Implementation Method 2
comprising joining the first current collector and the other conductive member to each other by applying a high-energy ray to the joining portion of the first current collector in which the metal plates are joined together.
Data Source
AI summary
In the present method of manufacturing a secondary battery, a current collector is a first stack in which a plurality of metal plates are stacked, the current collector includes a first region and a second region, a positive electrode tab group is joined to the first region, a positive electrode current collection portion is joined to the second region, the method including: a preparation step of preparing the current collector having a first joining portion in which the metal plates are partially joined together; a first tab group connection step of joining the positive electrode tab group to the current collector; and an other conductive member connection step of joining the positive electrode current collection portion to the current collector. According to the present method of manufacturing the secondary battery, occurrence of damage to the tab group can be suppressed.