Square Battery Current Interrupt Mechanism
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Solution Overview
Problem
Existing square secondary batteries face instability in their current interrupt mechanisms due to the deformation of soft insulating members under the weight of heavy electrode bodies, leading to potential malfunctions and increased risks of reconnection and sparks.
Innovation Solution
A square secondary battery design featuring a current interrupt mechanism with a deforming plate and a first insulator supported by multiple fasteners, including a first, second, third, and fourth fastener, which distribute the weight and reduce the risk of deformation, ensuring stable operation even under increased internal pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the second insulating member is made of soft resin material to reduce damage risk during connection, then the risk of damage during assembly is reduced, but the insulating member deforms under the weight of the electrode body causing malfunction of the current interrupt mechanism
Solution Approach 1:
The insulating member is divided into multiple segments (first insulating member, second insulating member, third insulating member) connected by fasteners. This segmentation allows each segment to be optimized independently - softer materials can be used at connection points while maintaining overall structural integrity to prevent deformation under electrode body weight.
Solution Approach 2:
The insulating member uses composite construction with multiple materials having different properties. The first insulating member uses softer resin material for damage-resistant connection, while the overall structure incorporates reinforcement elements and multiple fastening points to prevent deformation, creating a composite structure that balances both requirements.
2Object-affected harmful factors
If the insulating member is made of fluorine resin to prevent carbonization and sparks, then the resistance to carbonization is improved, but the insulating member becomes softer and more prone to deformation under load
Solution Approach 1:
The insulating member is segmented into multiple parts that can have different material properties. The fluorine resin portions provide carbonization resistance where electrical contact occurs, while other segments incorporate reinforcement structures or different materials to maintain structural strength and resist deformation under the electrode body weight.
Solution Approach 2:
The insulating member employs composite material construction combining fluorine resin (for carbonization resistance) with reinforcement elements or hybrid materials (for structural strength). This creates a multi-material structure that simultaneously achieves both carbonization resistance and deformation resistance under load.
3Reliability
If multiple fasteners are used to distribute weight and prevent deformation, then the structural stability is improved, but the device complexity increases
Solution Approach 1:
The insulating member is divided into segments connected by fasteners positioned at strategic locations. This segmentation provides weight distribution and deformation prevention through the fastener connections, while the modular segmented design makes the complexity manageable through standardized connection interfaces and systematic fastener placement.
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 design enhances the mechanical strength and stability of the current interrupt mechanism, reducing the likelihood of malfunction and maintaining reliable operation even with heavy electrode bodies, thus ensuring consistent and safe battery performance.
Implementation Method 1
a deforming plate sealing an opening of the tube, electrically connected to the electrical conductor and to either the positive electrode current collector or the negative electrode current collector, and deformed when an internal pressure of the battery case reaches a predetermined pressure so that the deforming plate is electrically disconnected from either the positive electrode current collector or the negative electrode current collector
Implementation Method 2
a first insulator provided between the deforming plate and either the positive electrode current collector or the negative electrode current collector, and supported toward the sealing body, either the positive electrode current collector or the negative electrode current collector including: a base facing the first insulator; and a lead extending from an end of the base and connecting to the electrode body, the first insulator including a fastener fastening the base and the first insulator together, the fastener including at least a first fastener, a second fastener, a third fastener, and a fourth fastener
Data Source
AI summary
A battery includes: an electrode body; an electrode current collector; a sealing body; an external terminal; an electrical conductor connected to the external terminal; a deforming plate sealing an opening of the electrical conductor, electrically connected to the electrical conductor and to the current collector, and deformed when an internal pressure reaches a predetermined pressure; and a first insulator between the deforming plate and the current collector. The current collector includes a base, and a lead connecting to the electrode body. First to fourth fasteners fasten the base and the first insulator. Between the first and second fasteners, the base is electrically connected to the deforming plate. The second fastener is closer to the lead than the first fastener. The second fastener is closer to a connection between the deforming plate and the electrode current collector than a position of the first insulator supported toward the sealing body.