Heat-Resistant Insulating Layer for Battery Safety
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Solution Overview
Problem
Rechargeable batteries face issues with short-circuits due to excessive heat and pressure, which can lead to vent plate and middle plate contact, causing electrical arcs and potential fires.
Innovation Solution
A heat-resistant insulating layer made of polyimide-based resin is introduced between the vent plate and the middle plate, with a higher melting point than the lower insulating member, to prevent electrical arcs and short-circuits by maintaining insulation even under high temperatures and pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional insulating member is used between the vent plate and middle plate, then the structure is simple and easy to manufacture, but the insulating member melts under excessive heat causing short-circuits
Solution Approach 1:
A heat-resistant insulating layer made of polyimide-based resin is introduced as an intermediary between the vent plate and middle plate. This layer has a higher melting point than conventional insulating members, allowing it to maintain insulation properties under excessive heat conditions and prevent short-circuits between the vent plate and middle plate.
Solution Approach 2:
The patent uses a composite structure combining a conventional lower insulating member with a heat-resistant polyimide-based insulating layer. This composite approach provides both the mechanical support function of the lower insulating member and the high-temperature resistance of the polyimide layer, achieving reliable short-circuit prevention under thermal stress.
2Temperature
If the insulating layer has low melting point for easy processing, then manufacturing is simpler, but it fails to prevent contact between vent plate and middle plate under high temperature
Solution Approach 1:
The patent changes the material parameter (melting point) of the insulating layer by selecting polyimide-based resin with a higher melting point than conventional materials. This parameter change ensures the insulating layer maintains its structural integrity and insulation properties under high-temperature conditions, preventing vent plate and middle plate contact.
3Object-affected harmful factors
If no heat-resistant insulating layer is provided, then the device structure remains simple, but electrical arcs and fires can occur under excessive heat and pressure
Solution Approach 1:
The heat-resistant insulating layer is pre-installed between the vent plate and middle plate to provide preliminary protection against electrical arcs and short-circuits. This preventive measure ensures that even when excessive heat and pressure occur, the insulating layer maintains its properties and prevents harmful electrical discharges, avoiding fires and damage.
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 heat-resistant insulating layer effectively prevents electrical arcs and short-circuits, ensuring the safety and reliability of rechargeable batteries by maintaining insulation and preventing contact between the vent plate and middle plate under conditions of excessive heat and pressure.
Implementation Method 1
a heat-resistant insulating layer disposed between the vent plate and the middle plate
Implementation Method 2
The heat-resistant insulating layer may have a higher melting point than the lower insulating member
Data Source
AI summary
A rechargeable battery includes an electrode assembly including a positive electrode and a negative electrode, a case for accommodating the electrode assembly, a cap plate combined to the case, a vent plate disposed under the cap plate and formed with a notch, a middle plate disposed under the vent plate, and a heat-resistant insulating layer disposed between the vent plate and the middle plate.