Cable-Type Battery Protection Circuit With Insulation and Waterproofing
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Solution Overview
Problem
Conventional cable-type secondary batteries face challenges in protecting the battery cell from overcharge, overdischarge, and external impacts, while also requiring insulation and waterproofing of the protection circuit module.
Innovation Solution
A cable-type battery design featuring a protection circuit module connected to the battery cell, surrounded by an insulation member, and optionally housed in an accommodating protection circuit module, which includes a flexible board to provide protection and insulation.
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 segment performs a specific protective function, allowing the circuit to comprehensively protect the battery cell while maintaining the cable-type battery's flexible shape
Solution Approach 2:
An insulation member is introduced as an intermediary component between the protection circuit module and the battery cell. This insulation member provides both electrical insulation and mechanical protection, enabling the circuit to protect the battery cell from overcharge/overdischarge while the battery maintains its deformable cable structure
2Reliability
If the protection circuit module is added to protect the battery cell, then overcharge and overdischarge protection is achieved, but the circuit module requires insulation and waterproofing
Solution Approach 1:
The insulation function and waterproofing function are merged into a single insulation member that surrounds the protection circuit module. This multi-functional component simultaneously provides electrical insulation, moisture barrier, and mechanical protection, reducing the overall device complexity while achieving comprehensive protection
Solution Approach 2:
The insulation member is designed with multi-functionality: it provides electrical insulation for the circuit module, waterproofing barrier against moisture, mechanical protection for internal components, and structural support for the cable-type battery. This universal component simplifies the overall design by consolidating multiple protective functions
3Object-affected harmful factors
If the protection circuit module surrounds the battery cell, then protection from external impact is achieved, but the overall device complexity increases
Solution Approach 1:
The insulation member is positioned to surround and cushion the protection circuit module before external impact reaches it. This pre-positioned protective layer absorbs and distributes impact forces, protecting the circuit module from damage while maintaining a simple cable-type structure without additional complex protective housings
Data Source
AI summary
A cable-type battery includes 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 at least one 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.