Pouch Battery Terrace Circuit Nesting
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Solution Overview
Problem
Conventional pouch type batteries have a limited design that does not allow for the efficient integration of a protective circuit module within the battery, leading to increased length and potential electrical shorts.
Innovation Solution
The integration of a protective circuit module inside a terrace of the pouch-shaped bare cell, where the electrode tab is bent to connect with the circuit board without additional conductors, and barriers are used to prevent electrical shorts, allowing for a more compact design and reduced length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the protective circuit module is placed outside the pouch-shaped bare cell, then the battery structure is simpler, but the overall length of the battery increases
Solution Approach 1:
The protective circuit module is nested inside the pouch-shaped bare cell by utilizing the terrace space. The circuit board is positioned within the terrace, and the electrode tab is bent to make electrical connection with the circuit board, effectively hiding the protective module within the battery structure without increasing overall dimensions.
Solution Approach 2:
The electrode tab is bent in a three-dimensional configuration to connect the internal circuit board with the external terminal. This spatial rearrangement allows the circuit board to be positioned inside the pouch while maintaining electrical connectivity, transforming a linear arrangement into a multi-dimensional configuration.
2Device complexity
If the electrode tab is bent to connect with the protective circuit board, then additional conductors are eliminated, but the risk of electrical short increases
Solution Approach 1:
A barrier is introduced as an intermediary element between the electrode tab and the protective circuit board. This barrier prevents direct contact that could cause electrical short while allowing the bent electrode tab to maintain its connecting function, thus mediating between the need for simple conductor arrangement and electrical safety.
Solution Approach 2:
The barrier is extracted as a separate safety component that is not part of the electrical conduction path. By removing potential short-circuit pathways through the barrier structure, the design eliminates harmful electrical connections while preserving the necessary functional connections through the bent electrode tab.
3Device complexity
If the sealing area of the electrode tab is bent, then the terrace space is reduced, but the electrode tab connection is simplified
Solution Approach 1:
The bending is localized to specific regions of the electrode tab rather than affecting the entire structure. The sealing area is bent only to the extent necessary for connection, while the terrace space is preserved by limiting the bend radius and position, thus applying local deformation rather than global structural change.
Data Source
AI summary
A pouch type battery, including a pouch type bare cell having a terrace and having an electrode tab adjacent to the terrace, the terrace being an empty space defined where a sealing area of the electrode tab is not bent, the sealing area positioned in a direction in which the electrode tab extends, a protective circuit board electrically connected to the electrode tab, the protective circuit board positioned in the terrace and including a protection circuit, an upper case supporting the protective circuit board and encasing an upper portion of the bare cell, and a first barrier protruding downwardly from the upper case and electrically separating the protective circuit board from the electrode tab.