Secondary Battery Short-Circuiting Mechanism with Brazing Material
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Solution Overview
Problem
Existing secondary batteries face reliability issues due to unstable short-circuit maintenance between positive and negative external terminals caused by vehicle vibrations, which can lead to reduced battery performance and safety concerns during internal pressure increases.
Innovation Solution
A secondary battery design incorporating a short-circuiting mechanism with a conducting portion, inversion plate, and brazing material, where the brazing material connects the conducting portion and inversion plate upon internal pressure rise, stabilizing the short-circuit by melting and solidifying to maintain electrical connection, and a resistor regulates the short-circuit current to ensure stable brazing material melting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a stacked body with resistor and conductive member is used for short-circuiting, then the short-circuit mechanism can be activated, but large vehicle vibrations cause the inversion plate to separate from the stacked body, making the short-circuit unstable
Solution Approach 1:
The invention changes the physical state of the brazing material from solid to liquid and back to solid through temperature changes. When the inversion plate contacts the conducting portion, resistance heating melts the brazing material, which then solidifies to firmly connect the inversion plate to the conducting portion, preventing separation due to vibrations and ensuring stable short-circuit maintenance.
Solution Approach 2:
The brazing material undergoes phase transition from solid to liquid when heated by resistance heating during short-circuit, and then from liquid to solid when cooling down. This phase transition enables the brazing material to flow and fill the connection interface, then solidify to create a strong, vibration-resistant bond between the inversion plate and conducting portion.
2Strength
If the brazing material is used to connect the conducting portion and inversion plate, then the connection becomes firm and vibration-resistant, but the melting process requires controlled current to prevent overheating
Solution Approach 1:
The brazing material serves as an intermediary substance between the conducting portion and inversion plate. It absorbs the heat generated during short-circuit, melts at a controlled temperature to create a strong bond, and then solidifies to form a durable connection. The brazing material's melting and solidification process naturally regulates the temperature, preventing excessive heat while ensuring firm connection.
Solution Approach 2:
The invention utilizes the melting point parameter of the brazing material to control the heating process. By selecting a brazing material with an appropriate melting point, the system ensures that the material melts at the temperature generated during short-circuit without causing overheating damage to other components, thereby achieving both strong connection and temperature control.
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 solution effectively maintains a stable short-circuit state between the battery terminals, enhancing battery reliability and preventing overheating and damage from overcharging, allowing for reliable power supply even during vehicle vibrations.
Implementation Method 1
a short-circuit current flows through the brazing material, and the brazing material heats up due to resistance heating
Implementation Method 2
the brazing material melts and spreads out
Implementation Method 3
the brazing material solidifies and the conducting portion and the inversion plate become fixed to each other
Implementation Method 4
the brazing material heats up due to resistance heating
Data Source
AI summary
A secondary battery includes: a battery element; a case housing the battery element; a positive-electrode external terminal and a negative-electrode external terminal provided outside the case and electrically connected to the battery element; and a short-circuiting mechanism configured to establish a short-circuit between the positive and negative external terminals through the case. The short-circuiting mechanism includes a conducting portion conductively connected to one of the positive and negative external terminals so as to face the case, an inversion plate provided at a portion of the case facing the conducting portion and configured to deform to approach the conducting portion when an internal pressure of the case rises, and a brazing material provided on one of the conducting portion and the inversion plate at a position between the conducting portion and the inversion plate.