Inclined-Surface Current Interrupter for Battery Module Ignition Prevention
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Solution Overview
Problem
The safety of battery modules is compromised due to electrical interactions between secondary batteries, leading to potential ignition, which existing safety devices fail to adequately address.
Innovation Solution
A current interrupt device with inclined surfaces that contact and electrically connect secondary batteries, dislocating upon application of a predetermined external force to interrupt electrical connection, incorporating adhesion and pressing parts to manage force and prevent ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If secondary batteries are electrically connected in a battery module to increase capacity, then the capacity per unit volume increases, but the temperature of the entire battery module rapidly increases due to electrical interaction between the secondary batteries
Solution Approach 1:
The current interrupt device acts as an intermediary component between secondary batteries in a battery module. It includes a first connection part connected to a first secondary battery and a second connection part connected to a second secondary battery, with pressing parts that can apply pressing force to these connection parts. This intermediary device monitors and controls the electrical interaction between batteries, interrupting current flow when excessive temperature or force is detected, thus preventing thermal runaway while maintaining the electrical connectivity needed for high capacity operation.
2Reliability
If a current interrupt device is added to prevent ignition, then safety of the battery module is improved, but the device complexity increases
Solution Approach 1:
The current interrupt device is segmented into distinct functional components: a first connection part for electrical connection to the first secondary battery, a second connection part for electrical connection to the second secondary battery, and pressing parts for applying mechanical force. This segmentation allows each component to perform its specific function efficiently while maintaining overall simplicity. The inclined surfaces on the connection parts enable automatic mechanical interruption without complex sensing or control systems.
Solution Approach 2:
The current interrupt device utilizes self-service mechanisms where the pressing parts automatically apply pressing force to the connection parts based on thermal expansion or pre-set mechanical properties. When excessive temperature or force occurs, the device automatically interrupts current flow through the dislocation of inclined surfaces without requiring external control systems, sensors, or power sources, thereby maintaining simplicity while ensuring safety.
3Reliability
If inclined surfaces with adhesion parts are used to maintain electrical connection, then electrical connectivity is ensured, but when excessive force is applied the adhesion must be overcome to interrupt connection
Solution Approach 1:
The adhesion parts on the inclined surfaces utilize parameter changes in material properties with temperature. The adhesion strength of these parts varies with temperature, maintaining strong electrical connection during normal operation but automatically reducing adhesion when excessive temperature is reached. This allows the device to transition from a connected state to an interrupted state based on thermal parameters without requiring complex control mechanisms.
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
Prevents ignition in battery modules by ensuring electrical disconnection upon excessive force, enhancing safety and minimizing defective rates.
Implementation Method 1
the inclined surface of the first connection part and the inclined surface of the second connection part contact each other to form a contact interface
Implementation Method 2
when an external force equal to or greater than a predetermined force is applied to the inclined surface of the first connection part or the inclined surface of the second connection part, the inclined surface of the first connection part and the inclined surface of the second connection part are dislocated with respect to each other on the contact interface
Implementation Method 3
an adhesion part disposed on the contact interface so that the inclined surface of the first connection part and the inclined surface of the second connection part adhere to each other
Data Source
AI summary
A current interrupt device, which may be included in a battery module, includes first and second connection parts each having one surface on which an inclined surface is formed; wherein the inclined surface of the first connection part and the inclined surface of the second connection part contact each other to form a contact interface, the first connection part and the second connection part are electrically connected to each other, and when an external force equal to or greater than a predetermined force is applied to the inclined surface of the first connection part or the inclined surface of the second connection part, the inclined surface of the first connection part and the inclined surface of the second connection part are dislocated with respect to each other on the contact interface to interrupt electrical connection between the first connection part and the second connection part.