Voltage Detection Line Structure to Prevent Reconnection After Fusing
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Solution Overview
Problem
There is a risk of reconduction in voltage detection lines due to external vibrations or deflection, which can lead to safety issues in battery modules.
Innovation Solution
The voltage detection lines are designed with conductive wires having low-resistance and high-resistance parts, and insulating films with varying strengths, where the high-resistance parts fuse upon overcurrent, and the insulating films are structured to prevent reconnection by having low-strength parts that allow physical separation of disconnected wires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a current limiting element is provided in the voltage detection line to suppress short circuit, then battery safety is improved, but the possibility of reconduction due to vibration or deflection increases
Solution Approach 1:
The voltage detection line is segmented into multiple sections with different insulating film strengths. The weak insulating film section is positioned at a specific location to enable controlled separation when overcurrent occurs, preventing reconduction while maintaining overall line integrity during normal operation.
Solution Approach 2:
Different sections of the insulating film are designed with different strengths tailored to their specific functions. The weak insulating film section is specifically designed to break under overcurrent conditions to prevent reconduction, while other sections maintain sufficient strength for normal operation and vibration resistance.
2Stability of the object's composition
If the voltage detection line is made robust to prevent vibration-induced disconnection, then connection stability is improved, but the ability to safely disconnect during overcurrent is reduced
Solution Approach 1:
The insulating film is divided into sections with different strengths, allowing the overall structure to be robust while having a specific weak point that enables safe disconnection during overcurrent events.
Solution Approach 2:
The insulating film strength parameter is varied along the length of the voltage detection line, creating a gradient of mechanical properties that balances connection stability with the ability to disconnect safely under fault conditions.
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 design effectively suppresses reconduction and enhances the safety of battery modules by ensuring that disconnected voltage detection lines do not reestablish contact, preventing arc discharges and maintaining electrical stability.
Implementation Method 1
a high-resistance part having a higher electrical resistance value than an electrical resistance value of the low-resistance part and fusing when an overcurrent flows through the conductive wire
Implementation Method 2
insulating films covering the conductive wires
Data Source
AI summary
Provided is a voltage detection line including conductive wire and insulating film covering conductive wire, and detecting voltage of a battery in order to suppress reconduction of a disconnected voltage detection line. Conductive wire includes low-resistance part having a predetermined electrical resistance value, and high-resistance part having a higher electrical resistance value than an electrical resistance value of low-resistance part and fusing when an overcurrent flows through conductive wire. Insulating film includes high-strength part that covers low-resistance part and has a predetermined strength, and low-strength part that covers high-resistance part and has a strength lower than a strength of high-strength part.