Battery Safety Mechanism With Thin Insulating Adhesive Venting
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Solution Overview
Problem
Existing battery safety mechanisms are not thin enough to allow for further reduction in battery thickness, limiting the increase in positive and negative electrode sizes and thus battery capacity.
Innovation Solution
A battery safety mechanism with a pressure release member and a current shutoff member bonded by an insulating adhesive layer, which is thinner than traditional configurations using molded resin, allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional molded resin is used as the insulating material between the pressure release member and current shutoff member, then the safety mechanism has sufficient insulating strength and adhesion, but the thickness of the safety mechanism increases, limiting battery capacity
Solution Approach 1:
The patent changes the physical and chemical parameters of the insulating material from traditional molded resin to a curable adhesive composition with specific properties (viscosity 10-1000 cP, solid content 10-50%). This adhesive can be applied in thin layers (1-10 μm) while maintaining sufficient insulating strength and adhesion, thereby reducing the overall thickness of the safety mechanism without compromising reliability
Solution Approach 2:
The patent uses a composite adhesive system consisting of base resin (polyester, acrylic, or vinyl chloride), curing agent, and specific additives. This composite material formulation provides both the required mechanical properties (adhesion, flexibility) and electrical insulation properties in a thin layer, resolving the contradiction between thickness reduction and reliability maintenance
2Volume of stationary object
If the safety mechanism is made thinner to increase battery capacity, then more internal volume is available for electrodes, but the structural integrity and pressure resistance may be compromised
Solution Approach 1:
The patent employs a thin film adhesive layer (1-10 μm) that provides sufficient structural integrity and pressure resistance despite its minimal thickness. The adhesive composition includes flexible polymer chains and plasticizers that maintain structural strength while enabling thin-film construction, allowing the safety mechanism to be thinner without compromising structural integrity
Solution Approach 2:
The patent modifies the rheological and mechanical parameters of the adhesive (molecular weight 1000-100,000, viscosity 10-1000 cP, elongation at break 50-200%) to achieve optimal balance between thin-film flexibility and structural strength. These parameter adjustments ensure the thin adhesive layer can withstand internal pressure while maintaining structural integrity
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 enables a thinner safety mechanism, allowing for increased electrode sizes and battery capacity while maintaining strong adhesion and resistance to internal pressure and external impacts.
Implementation Method 1
an insulating adhesive layer interposed between the pressure release member and the current shutoff member and bonding the pressure release member to the current shutoff member
Data Source
AI summary
A safety mechanism of a battery that includes: a lid; a pressure release member in contact with the lid and constructed to be deformed when an internal pressure of the battery increases so as to release a gas inside the battery to an outside of the battery; a current shutoff member on a side opposite to the lid with respect to the pressure release member, and connected to the pressure release member so as to shut off a current flowing to the pressure release member when the internal pressure of the battery increases; and an insulating adhesive layer interposed between the pressure release member and the current shutoff member and bonding the pressure release member to the current shutoff member.