Flipping Member Deformation Cushion for Battery Current Interruption
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Solution Overview
Problem
Existing battery management systems face challenges in controlling battery charging and discharging, particularly in ternary systems, leading to risks of overcharging, swelling, and explosion due to voltage and current sampling failures, especially during communication failures between charging piles and battery managers.
Innovation Solution
A current interrupt apparatus featuring a flipping member with a deformation cushion region, connected to a score member, which can break under air pressure to interrupt current flow between electrode terminals, ensuring reliable and safe battery operation by cushioning external forces and preventing overcharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a voltage and current monitoring system is used to control battery charging and discharging, then battery management capability is improved, but reliability is worsened due to sampling failures and communication failures that cannot forcibly interrupt current
Solution Approach 1:
The patent replaces the electronic control system (BMS) with a mechanical force amplification system. The elastic component stores mechanical energy and the lever component amplifies this force to reliably break the score line and interrupt current, eliminating dependence on electronic sampling and communication systems.
Solution Approach 2:
The patent utilizes air pressure (pneumatics) as the power source for the current interruption mechanism. The elastic component is inflated with air to generate the mechanical force needed to drive the lever and break the score line, providing a reliable physical interruption method independent of electronic systems.
2Speed
If a score line is made to be easily breakable for current interruption, then current interrupting speed is improved, but structural strength is worsened making the component vulnerable to accidental breakage
Solution Approach 1:
The score member has different properties in different regions: the score line region is designed to be weak and easily breakable, while other regions maintain sufficient strength. This localized weakness allows fast interruption at the score line while the overall structure remains strong enough to resist accidental breakage from normal operational forces.
Solution Approach 2:
The deformation cushion region is designed to absorb and dissipate external forces before they can reach the score line. This pre-cushioning mechanism protects the score line from accidental breakage while allowing it to break reliably when the elastic component applies the intended breaking force.
3Force
If external forces are applied directly to the score member for current interruption, then interruption force is improved, but accidental breakage risk is worsened due to impact on the score line
Solution Approach 1:
The deformation cushion region is positioned between the external force application point and the score line to absorb and dissipate impact forces. This pre-cushioning prevents accidental breakage of the score line from external forces while allowing the controlled breaking mechanism to function when needed.
Solution Approach 2:
The lever component acts as an intermediary that converts the relatively small force from the elastic component into a large breaking force at the score line. This mechanical advantage allows the score line to be broken with minimal force from the elastic component, reducing the risk of accidental breakage from external forces.
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 current interrupt apparatus effectively prevents battery overcharging and explosion by reliably cutting off current flow under air pressure, enhancing safety and stability in battery management systems.
Implementation Method 1
an elastic component (1030) and a lever component (1020). The lever component (1020) is connected to the inner electrode terminal (1009) and the elastic component (1030)
Implementation Method 2
The flipping member is to be electrically connected to a score member, and can act under an effect of air pressure to pull to break a score on the score member
Data Source
AI summary
A current interrupt apparatus and a flipping member thereof, a battery cover plate assembly, a cell, a battery module, a power battery, and an electric vehicle are provided. The flipping member is to be electrically connected to a score member, and can act under an effect of air pressure to break a score on the score member so as to cut off the electrical connection to the score member. A first connection region to be electrically connected to the score member and a second connection region to be electrically connected to an outer electrode terminal of a battery are formed on the flipping member. A deformation cushion region is further formed on the flipping member. The deformation cushion region is disposed between the first connection region and the second connection region and around the first connection region.