Cylindrical Battery Negative Lead Insulation
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Solution Overview
Problem
Cylindrical batteries face the risk of short circuits due to the tip portion of the electrode lead moving and contacting the counter electrode under impact or vibration, as the lead is not welded to the can bottom, leading to potential contact with the positive electrode.
Innovation Solution
A cylindrical battery design with an insulating tape attached to the tip side of the electrode lead, closer to the tip than the welding point, to prevent contact between the lead and the counter electrode, even under impact or vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lead tip is not welded to the can bottom, then the lead can move freely under impact or vibration, but this movement may cause contact with the positive electrode leading to short circuit
Solution Approach 1:
An insulating tape is introduced as an intermediary component between the lead and the positive electrode. This tape prevents direct contact and potential short circuits while allowing the lead to maintain its flexibility and movement capability under impact or vibration conditions.
Solution Approach 2:
The insulating tape is applied in advance to the lead surface to prevent the harmful effect of short circuiting. By pre-applying the insulating layer, the design proactively counteracts the potential risk of lead contact with the positive electrode before such contact can occur.
2Reliability
If insulating tape is applied to the lead, then short circuit risk is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The insulating tape is a simple, inexpensive component that can be easily applied and replaced if necessary. This approach prioritizes reliability enhancement through a low-cost, simple solution rather than designing a complex permanent insulation system.
3Stability of the object's composition
If the lead is welded closer to the tip, then structural stability is improved, but the tip portion has less freedom of movement to accommodate impact and vibration
Solution Approach 1:
The insulating tape is applied specifically to the tip portion of the lead where movement occurs, while the welded portion maintains its structural stability. This localized application allows different regions of the lead to have different properties: stability at the weld and flexibility at the tip.
Data Source
Figure 1
Figure 2~4
AI summary
A cylindrical battery that is one example of an embodiment comprises: an electrode body (14) that includes a positive electrode lead (20) and a negative electrode lead (21); and a bottomed cylindrical outer can (16) that accommodates the electrode body (14). The cylindrical battery has a structure in which a portion (21a) where the negative electrode lead (21) is welded to the can bottom inner surface of the outer can (16) is formed at a section of the negative electrode lead (21) separate from the leading end thereof. The cylindrical battery that is one example of an embodiment further comprises an insulation tape (50) that is affixed to at least the upper surface of the leading end portion of the negative electrode lead (21) facing toward the electrode body (14).