Battery Cell Electrode Assembly for Positive-Side Short-Circuit Fusing
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Solution Overview
Problem
Battery cells face reliability issues due to high temperatures during short-circuit events, which can lead to fires and explosions, particularly when the fusing position is on the negative electrode side with higher melting points.
Innovation Solution
The battery cell design includes a positive electrode connecting assembly with a smaller cross-sectional area and lower melting point than the negative electrode connecting assembly, ensuring that fusing occurs at the positive electrode when short-circuited, thereby reducing overall temperature and minimizing fire and explosion risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fusing position is on the negative electrode side with higher melting points, then the current-carrying capability is improved, but the temperature during short-circuit events increases, leading to fires and explosions
Solution Approach 1:
The patent applies local quality by creating asymmetric design between positive and negative electrode connecting assemblies. The positive electrode connecting assembly has smaller cross-sectional area and lower melting point material, while the negative electrode connecting assembly has larger cross-sectional area and higher melting point material. This localized differentiation ensures that during short-circuit events, the positive electrode side fuses first at lower temperature, preventing catastrophic failures while maintaining overall current-carrying capability.
Solution Approach 2:
The patent inverts the conventional approach by making the positive electrode connecting assembly (typically associated with lower melting point aluminum) have the smaller cross-sectional area and lower melting point, while the negative electrode connecting assembly (typically associated with higher melting point copper) has the larger cross-sectional area. This inversion ensures that the positive electrode side becomes the preferred fusing location, controlling the short-circuit behavior and reducing overall temperature.
2Temperature
If the cross-sectional area of the positive electrode connecting assembly is reduced, then the fusing temperature is lowered, but the current-carrying capability is reduced
Solution Approach 1:
The patent applies asymmetry by deliberately designing the positive and negative electrode connecting assemblies with different cross-sectional areas and material properties. The positive electrode connecting assembly has smaller cross-sectional area and lower melting point, while the negative electrode connecting assembly has larger cross-sectional area and higher melting point. This asymmetric design creates a controlled imbalance that directs short-circuit fusing to the positive electrode side at lower temperature, while the larger negative electrode assembly maintains sufficient current-carrying capability for normal operation.
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 lowers the temperature of the battery cell when the short-circuit path is cut off, reducing the risk of fires and explosions, thus enhancing the reliability of the battery cell.
Implementation Method 1
a melting point of the positive electrode connecting assembly is smaller than a melting point of the negative electrode connecting assembly... so that a fusing position occurs at the positive electrode connecting assembly when the battery cell is short-circuited
Implementation Method 2
a minimum current-carrying cross-sectional area of the positive electrode connecting assembly is smaller than a current-carrying cross-sectional area of the positive electrode lead-out portion... so that a fusing position occurs at the positive electrode connecting assembly when the battery cell is short-circuited, and the overall temperature of the battery cell is lower when the short-circuit path of the battery cell is fused
Data Source
AI summary
Disclosed are a battery cell, a battery, and an electric device. The battery cell includes an electrode assembly, a positive electrode lead-out portion, a positive electrode connecting assembly, a negative electrode lead-out portion, and a negative electrode connecting assembly; the positive electrode connecting assembly is connected to a positive plate and the positive electrode lead-out portion; the negative electrode connecting assembly is electrically connected to a negative plate and the negative electrode lead-out portion; a minimum current-carrying cross-sectional area of the positive electrode connecting assembly is smaller than a current-carrying cross-sectional area of the positive electrode lead-out portion, a melting point of the positive electrode connecting assembly is smaller than a melting point of the negative electrode connecting assembly, and the minimum current-carrying cross-sectional area of the positive electrode connecting assembly is A1, with a unit of mm2.