Pouch Battery Temperature-Protecting Element Nesting
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Solution Overview
Problem
Rechargeable batteries face challenges in effectively protecting against temperature exposure, particularly in slim and compact designs where the temperature-protecting elements can be exposed, compromising safety and efficiency.
Innovation Solution
A rechargeable battery design incorporating a temperature-protecting element with a positive temperature coefficient, integrated into a pouch-type battery structure, where the element is attached to a terrace portion and covered by insulating tape to prevent exposure, ensuring electrical isolation and reconnection based on temperature thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the battery is designed to be slim and compact, then the battery size and weight are reduced, but the temperature-protecting element becomes exposed compromising safety
Solution Approach 1:
The temperature-protecting element is nested within the pouch structure by attaching it to the terrace portion and covering it with insulating tape. This nesting approach allows the protective element to be integrated into the compact battery design without protruding externally, thus maintaining both slimness and safety protection.
Solution Approach 2:
An insulating tape is introduced as an intermediary component to cover the temperature-protecting element. This mediator prevents direct exposure of the protective element while allowing it to function internally, resolving the conflict between compact design and safety protection.
2Reliability
If the temperature-protecting element is covered to prevent exposure, then safety is improved, but the complexity of the battery structure increases
Solution Approach 1:
A thin insulating tape is used to cover the temperature-protecting element. This thin film approach provides the necessary protection and coverage without adding significant structural complexity or bulk to the battery design.
Solution Approach 2:
The insulating tape serving as a protective cover is merged with the existing pouch structure and terrace portion design. By integrating the covering function into the existing structural elements rather than adding separate complex components, the solution maintains simplicity while achieving safety protection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents exposure of the temperature-protecting element while maintaining the slim and compact form of the battery, ensuring safe operation by isolating the positive electrode lead tab from the protection circuit module during high temperatures and reconnecting when safe temperatures are reached.
Implementation Method 1
A rechargeable battery including an electrode assembly including a separator, and a first electrode and a second electrode disposed at opposite sides of the separator
Data Source
AI summary
A rechargeable battery includes an electrode assembly including a separator, and a first electrode and a second electrode disposed at opposite sides of the separator, a pouch accommodating the electrode assembly and including a terrace portion, first and second lead tabs extending from the first electrode and the second electrode, respectively, through the terrace portion of the pouch, and a temperature protecting element on the terrace portion. The temperature protecting element has a first surface connected to the first lead tab and to a connection tab partially contacting the terrace portion, and a second surface attached to the terrace portion and extending beyond the terrace portion, such that an insulating tape surrounds the terrace portion and covers the first lead tab, the connection tab, and the second surface of the temperature protecting element.