Battery Cell Current Collector Welding Layout for Local Overcurrent
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Solution Overview
Problem
Existing lithium ion batteries face significant safety hazards due to local overcurrent and lithium precipitation during cyclic charging and discharging, which are not effectively addressed by current electrical connection methods between the electrode assembly and the shell.
Innovation Solution
A battery cell design featuring a shell with a protruding first limit part, an end cover, and a current collector component with a body part and connecting part, where the connecting part is connected to the limit part and includes separate first and second welding regions to ensure reliable electrical connection and reduce local overcurrent, thereby enhancing the sealing effect and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collector component is connected to the shell through a conventional method, then the electrical connection is achieved, but the connection reliability is insufficient and local overcurrent occurs
Solution Approach 1:
The body part of the current collector component is divided into a first welding region and a second welding region that are separated by the connection position between the connecting part and the body part. This segmentation allows current to be distributed across multiple welding zones, preventing local overcurrent concentration and improving connection reliability.
2Reliability
If the connection position between the current collector component and the shell is located near the end cover, then the electrical connection is achieved, but the sealing effect between the end cover and the shell is compromised
Solution Approach 1:
The connecting part serves as an intermediary element that extends from the body part to connect with the first limit part on the inner surface of the shell. This intermediary structure enables electrical connection between the current collector component and the shell while maintaining a distance from the end cover, thus preserving the sealing effect.
3Reliability
If the outer ring of the tab is welded to the current collector component, then the electrical connection is improved, but the manufacturing complexity increases
Solution Approach 1:
The body part is pre-formed with a first welding region and a second welding region that are separated by the connection position. This preliminary structuring allows for systematic welding operations where the tab can be welded to both regions in a controlled manner, improving connection reliability while managing manufacturing complexity through pre-planned welding zones.
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
The design improves connection reliability between the current collector component and the shell, reducing the risk of polarization and lithium precipitation, thus enhancing the safety and sealing effectiveness of the battery cell.
Implementation Method 1
both the first welding region and the second welding region are welded to the tab
Data Source
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AI summary
The present application provides a battery cell, and a manufacturing method and a manufacturing equipment thereof, a battery, and an electrical device, belonging to the field of battery technology. The battery cell includes a shell, an end cover, an electrode assembly, and a current collector component. The shell has an opening, and the inner surface of the shell is provided with a first limit part in a protruding manner. The end cover covers the opening. The electrode assembly and the end cover are respectively located on both sides of the first limit part, and the electrode assembly has a tab on the side facing the end cover. The current collector component includes a body part and a connecting part connected to the body part, and the connecting part is connected to the first limit part. The body part includes a first welding region and a second welding region, the first welding region is located on the periphery of the second welding region, the first welding region and the second welding region are separated by the connection position between the connecting part and the body part, and both the first welding region and the second welding region are welded to the tab. This structure of battery cell can reduce the occurrence of local overcurrent between the outer ring of the tab and the current collector component, thereby reducing the risk of polarization and lithium precipitation of the battery cell.