Secondary Battery Current Interruption Structure for Vibration Reliability
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Solution Overview
Problem
Rectangular secondary batteries with current interruption mechanisms face reliability issues due to potential damage or breakage of weak portions and connecting areas under vibration or impact, and existing designs may not adequately prevent displacement between insulating and current collecting members.
Innovation Solution
The battery design incorporates an insulating member with fixing and displacement prevention projections that are securely fixed to the current collecting member, preventing displacement and reducing the risk of damage by ensuring the conductive path is broken effectively during pressure increases, using a deformation plate that deforms to interrupt the current path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current interruption mechanism is added to the secondary battery, then protection against overcharging is improved, but the risk of damage or breakage under vibration or impact increases
Solution Approach 1:
The current interruption mechanism is divided into separate functional components: a deformation plate that responds to pressure changes, a conductive member with a conductive path, and an insulating member with fixing projections. This segmentation allows each component to be optimized independently - the deformation plate for pressure response and the insulating member for vibration resistance through secure fixing structures.
Solution Approach 2:
The insulating member is pre-equipped with fixing projections that are inserted into fixing holes of the current collecting member before the battery undergoes vibration or impact. This preliminary fixing action ensures that components are securely positioned in advance, preventing displacement or breakage when vibration or impact occurs during battery operation.
2Stability of the object's composition
If the insulating member is securely fixed to the current collecting member, then displacement prevention is improved, but the complexity of the fixing structure increases
Solution Approach 1:
The insulating member incorporates fixing projections that automatically insert into and secure within the fixing holes of the current collecting member through its own structural features. The displacement prevention projection similarly uses the insulating member's inherent geometry to engage with corresponding features, enabling the component to secure itself without requiring external fastening mechanisms or complex assembly procedures.
3Speed
If the deformation plate is designed to deform easily in response to pressure increase, then current interruption response is improved, but the strength of the deformation plate under normal conditions decreases
Solution Approach 1:
The deformation plate is designed with non-uniform thickness, featuring a thinner deformation portion and a thicker non-deformation portion. The thinner deformation portion is strategically positioned to respond to pressure increases by deforming and interrupting the conductive path, while the thicker non-deformation portion provides structural support and maintains overall plate strength under normal operating conditions. This local quality variation allows the plate to simultaneously achieve rapid response and 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
This configuration enhances the reliability of the secondary battery by preventing damage to weak portions and ensuring reliable current interruption, even under strong impacts or vibrations, thereby improving the battery's overall performance and safety.
Implementation Method 1
a deformation plate that seals the opening portion and that is deformed in response to an increase in a pressure in the exterior body
Data Source
AI summary
A conductive member is disposed on a side of the sealing plate adjacent to an electrode assembly with a first insulating member disposed therebetween. The conductive member has a conductive-member opening portion. The conductive-member opening portion of the conductive member is sealed by a deformation plate. The deformation plate is connected to a first positive-electrode current collector, which is electrically connected to positive electrode plates. A second insulating member is disposed between the deformation plate and the first positive-electrode current collector. Fixing projections and displacement prevention projections are provided on a surface of the second insulating member. The second insulating member is fixed to the first positive-electrode current collector such that the fixing projections are disposed in fixing holes in the first positive-electrode current collector. The displacement prevention projections on the second insulating member are disposed in displacement prevention holes in the first positive-electrode current collector.