Secondary Battery Tab Insulation for Short-Circuit Spacing
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Solution Overview
Problem
Secondary batteries, particularly those used in wearable devices, face reliability issues due to short circuits between the first tab and the receiving can, which can compromise their performance and safety.
Innovation Solution
The secondary battery design incorporates an insulating layer coated on the first extension of the first tab facing the receiving can's outer wall, along with an insulating member on the outer wall of the receiving can, ensuring a minimum spacing of 50 μm between them, and includes a polymer coating such as polyimide tape to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the first tab is positioned close to the receiving can to reduce battery size, then the battery dimensions are reduced, but the risk of short circuit between the first tab and receiving can increases
Solution Approach 1:
An insulating member is introduced as an intermediary element positioned between the first tab and the receiving can. This insulating member prevents direct contact and potential short circuits while allowing the tab to maintain its compact positioning near the receiving can, thus resolving the contradiction between small battery size and short circuit prevention
Solution Approach 2:
The insulating member is applied locally at the specific region where the first tab contacts or approaches the receiving can, rather than coating the entire tab or can. This localized insulation provides targeted protection against short circuits while minimizing the space occupied by insulating materials, maintaining the compact battery design
Data Source
AI summary
A secondary battery includes an electrode assembly including a first electrode and a second electrode, a receiving can having an open first side to receive the electrode assembly and which is electrically connected to the first electrode, a cap assembly covering the open first side of the receiving can to enclose the electrode assembly from outside and being electrically connected to the second electrode, a first tab including a first body coupled to the cap assembly and a first extension bent and extending from the first body, and an insulating layer coated on a first surface of the first extension facing an outer wall of the receiving can.