Prismatic Battery Current Interruption Mechanism
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Solution Overview
Problem
Prismatic secondary batteries face issues with the reliability of their current interruption mechanism, which can be broken due to shock or vibration, and may re-establish electrical continuity due to sparks and carbonization, leading to malfunction.
Innovation Solution
The battery design includes a pressure-sensitive current interruption mechanism with a conductive member, inversion plate, and a second insulating member with fixing pawl portions that are robustly joined to prevent breakage and re-establishment of electrical continuity, using a resin material to prevent sparks and carbonization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the current interruption mechanism is made robust to prevent breakage, then reliability improves, but device complexity increases
Solution Approach 1:
The current interruption mechanism is divided into separate functional components: the inversion plate for pressure sensing and current interruption, the conductive member for electrical connection, and the insulating member for isolation. This segmentation allows each component to be optimized independently while maintaining overall reliability without excessive complexity.
Solution Approach 2:
The insulating member is positioned within the conductive member structure, and the inversion plate is nested within the sealed space formed by the conductive member. This nested arrangement compactly integrates multiple functions (electrical connection, insulation, pressure sensing) without increasing overall device complexity.
2Reliability
If the through-hole is sealed to prevent moisture entry, then reliability improves, but manufacturing complexity increases
Solution Approach 1:
The insulating member is pre-formed with a through-hole structure that allows electrolyte filling to proceed without requiring post-assembly sealing operations. The design anticipates the electrolyte filling process and accommodates it, simplifying manufacturing while maintaining protection.
Solution Approach 2:
The insulating member acts as an intermediary structure that provides both electrical isolation and a controlled pathway for electrolyte access. This mediator component eliminates the need for separate sealing operations by integrating the protection function into the structural design.
3Reliability
If fixing pawl portions are added to prevent breakage, then reliability improves, but device complexity increases
Solution Approach 1:
The fixing pawl portions are integrated directly into the insulating member structure, combining the electrical insulation function with the mechanical fixing function in a single component. This merging eliminates the need for separate fixing mechanisms, improving reliability without proportionally increasing complexity.
Solution Approach 2:
The fixing pawl portions are strategically positioned at specific locations on the insulating member where mechanical attachment is most effective. This localized approach provides maximum connection strength with minimal additional structure, avoiding unnecessary complexity.
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 reliability of the current interruption mechanism by preventing breakage and re-establishment of electrical continuity, ensuring the battery operates safely and effectively even under shock or vibration.
Implementation Method 1
an inversion plate formed of a conductive material that is deformed when the pressure inside the battery exceeds a particular level
Data Source
AI summary
A high-reliability prismatic secondary battery with a current interruption mechanism that is unlikely to be damaged even if the battery is subjected to shock is provided. The prismatic secondary battery includes a second insulating member having a first through-hole, the second insulating member being arranged between a first region of a positive electrode collector and an inversion plate. The first region of the positive electrode collector and the inversion plate are electrically connected to each other through the first through-hole. The second insulating member has a plurality of fixing pawl portions. The fixing pawl portions are hooked and fixed to a fixing portion formed on the outer surface side of the conductive member.