Secondary Battery Deformation Plate Current Interruption
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Solution Overview
Problem
Secondary batteries with current interruption mechanisms are reliable against overcharging, but there is a need for further enhancement in reliability to prevent damage from strong impacts or vibrations.
Innovation Solution
A secondary battery design that includes an electrode assembly, a conductive member, a deformation plate, and a current collecting member, where the deformation plate is deformed to break the conductive path between the electrode plate and the terminal, with a cover and insulating members to reduce load on weak portions and prevent damage during assembly and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the current collecting member is positioned close to the electrode assembly for compact design, then the battery structure is more compact, but the current collecting member is vulnerable to damage from electrode movement during impact or vibration
Solution Approach 1:
The patent introduces a cover as an intermediary component positioned between the electrode assembly and the current collecting member. This cover acts as a protective barrier that prevents direct contact between the electrode assembly and the current collecting member during impact or vibration events, thereby protecting the current collecting member from damage while maintaining the compact battery structure.
2Reliability
If the deformation plate is designed to break easily for reliable current interruption, then the current interruption mechanism activates reliably, but the weak portions become vulnerable to accidental breakage during assembly or operation
Solution Approach 1:
The patent applies beforehand cushioning by positioning the cover to protect the weak portions of the current collecting member before any impact or vibration occurs. The cover serves as a preventive protective measure that cushions the weak portions during normal assembly and operation, preventing accidental breakage while allowing the current interruption mechanism to activate reliably when pressure increases occur.
3Ease of operation
If the current collecting member has weak portions for controlled breakage, then the current interruption mechanism functions properly, but the battery is more sensitive to external impacts and vibrations
Solution Approach 1:
The cover serves as a protective intermediary that differentiates between normal operational conditions and harmful external impacts. During normal operation, the deformation plate can break at the weak portions to activate the current interruption mechanism. During external impacts or vibrations, the cover protects the weak portions from accidental damage, thereby reducing sensitivity to harmful external factors while maintaining ease of operation for the current interruption function.
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 increases the reliability of secondary batteries by preventing damage to weak portions and ensuring reliable activation of the current interruption mechanism, even under strong impacts or vibrations.
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 near a side of the sealing plate facing an electrode assembly with a first insulating member disposed therebetween. The conductive member has a conductive-member opening portion. The conductive member is connected to a positive electrode terminal that projects toward au outside of the battery from the sealing plate. 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 of a current collecting member, which is electrically connected to positive electrode plates. The deformation plate is deformed in response to an increase in pressure in a rectangular exterior body, and the conductive path between the positive electrode plate and the positive electrode terminal is broken in response to the deformation of the deformation plate. A cover is disposed between the first positive-electrode current collector and the electrode assembly.