Battery Cell Current Collector Layout for Internal Case Welding
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Solution Overview
Problem
Existing battery cell designs face challenges in conveniently establishing an electrical connection between the electrode assembly and the case, which affects the reliability and longevity of the battery cell due to inconvenient welding processes that can damage the case and lead to corrosion.
Innovation Solution
A battery cell design that incorporates a current collecting member located on the side of the electrode assembly facing the end cover, allowing for internal connection to the case, with the end cover sealing and connecting to the case, ensuring a stable and convenient electrical connection. This design includes welding the current collecting member to the case and utilizing position-limit portions for secure fixation and reduced risk of damage or corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current collecting member is welded to the case from the exterior, then the electrical connection is established, but the welding process may damage the outer layer structure of the case and cause corrosion
Solution Approach 1:
The patent inverts the conventional welding approach by performing the welding operation from the interior of the case rather than the exterior. The current collecting member is welded to the inner surface of the case, which protects the outer layer structure from welding damage and corrosion while maintaining reliable electrical connection between the current collecting member and the case
2Ease of operation
If the current collecting member is located inside the case, then the electrical connection is convenient, but the connection firmness and stability may be insufficient
Solution Approach 1:
The patent applies preliminary action by providing position-limit portions on the inner surface of the case before the welding process. These position-limit portions pre-position the current collecting member in the correct location, ensuring both convenient electrical connection and firm stable attachment. The position-limit portions prevent displacement during welding and provide a robust mechanical anchor
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 solution enables a more reliable and stable electrical connection between the electrode assembly and the case, reducing the risk of damage and corrosion, thereby enhancing the service life and performance of the battery cell.
Implementation Method 1
the current collecting member is welded to the case
Data Source
AI summary
Provided are a battery cell, a battery, an electrical device, and a manufacturing method and device for a battery cell, which belong to the field of battery technologies. The battery cell includes a case, an electrode assembly, an end cover, and a current collecting member. The case has an opening. The electrode assembly is accommodated in the case. The end cover covers the opening and is sealed and connected to the case. The current collecting member is accommodated in the case and located at a side of the electrode assembly facing the end cover. The current collecting member is configured to connect the case and the electrode assembly to electrically connect the electrode assembly to the case. The battery cell with such structure realizes an electrical connection between the electrode assembly and the case through the current collecting member. During assembling of the battery cell.