Cable Battery Protection Circuit for Flexible Waterproof Cells
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Solution Overview
Problem
Conventional cable-type secondary batteries lack adequate protection against overcharge, overdischarge, and external impacts, and require insulation and waterproofing to prevent electrical and environmental damage.
Innovation Solution
A cable-type battery design featuring a protection circuit module electrically connected to the battery cell, surrounded by an insulation member for waterproof and dustproof protection, and a flexible structure to accommodate external impacts, with a protection circuit module that can be connected to one end or wrap around the battery cell for comprehensive protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional secondary battery is formed to have a long length (cable-type), then it becomes easy to deform in shape and adaptable to various portable devices, but the battery cell cannot be adequately protected from overcharge or overdischarge
Solution Approach 1:
The protection circuit module is segmented into multiple functional components: overcharge protection circuit, overdischarge protection circuit, and insulation member. Each component performs a specific protective function, allowing the system to maintain reliability while preserving the cable-type battery's shape flexibility.
Solution Approach 2:
An insulation member is introduced as an intermediary component between the battery cell and the external environment. This insulation member provides physical protection and electrical insulation, enabling the battery to withstand external impacts and prevent short circuits while maintaining its deformable cable structure.
2Reliability
If a protection circuit module is added to protect the battery cell, then overcharge and overdischarge protection is achieved, but the device complexity increases
Solution Approach 1:
Multiple protection functions (overcharge protection, overdischarge protection, insulation) are merged into a single integrated protection circuit module. This consolidation reduces the number of separate components and simplifies the overall device structure while maintaining comprehensive battery protection.
Solution Approach 2:
The protection circuit module is designed with multi-functionality, serving as overcharge protection, overdischarge protection, and physical insulation simultaneously. This universal design approach allows one component to fulfill multiple protective roles, reducing overall device complexity.
3Ease of operation
If the protection circuit module is exposed, then electrical connection is maintained, but the module is vulnerable to water and dust damage
Solution Approach 1:
A flexible insulation member in the form of a thin film or shell is used to cover the protection circuit module. This flexible covering provides waterproof and dustproof protection while maintaining the module's electrical connection capabilities and accommodating the cable-type battery's deformable structure.
Data Source
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AI summary
Disclosed is a cable-type battery. The cable-type battery comprises: a cable-type battery cell including at least one internal electrode layer having an internal electrode active material formed on a surface of an internal current collector extending in a longitudinal direction to have a cross section of a preset shape, a separation layer formed to surround the internal electrode layer, and an external electrode layer formed to surround the separation layer and having an external electrode active material formed on a surface of an external current collector; and a protection circuit module electrically connected to the battery cell to protect the battery cell.