Battery Cell Vent Offset and Channel Gap for Timely Pressure Relief
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Solution Overview
Problem
Existing battery cells suffer from untimely pressure relief during thermal runaway, leading to poor reliability.
Innovation Solution
A battery cell design featuring a channel gap between the shell wall and main body part, with the pressure relief mechanism offset from the shell's center, allowing discharge medium to flow quickly to the mechanism, reducing the path length and improving timeliness of pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief mechanism is arranged at the center of the first wall part, then the structural symmetry is maintained, but the discharge medium from both ends of the main body part has a long flow path to reach the pressure relief mechanism, resulting in untimely pressure relief
Solution Approach 1:
The pressure relief mechanism is arranged off-center on the first wall part, specifically positioned closer to one end of the main body part. This asymmetric arrangement creates a shorter flow path for the discharge medium from the nearer end, enabling timely pressure relief. The offset distance is specifically designed to be between L/6 and L/3 of the total length L, optimizing the balance between pressure relief speed and structural stability.
2Reliability
If the pressure relief mechanism is positioned closer to one end of the main body part, then the flow path for discharge medium is shortened and pressure relief timeliness is improved, but the structural balance and stability may be affected
Solution Approach 1:
The patent optimizes the position parameter of the pressure relief mechanism by defining specific offset distance ranges (L/6 to L/3 from the center). This parameter optimization ensures that the mechanism is close enough to one end to shorten the flow path and improve pressure relief timeliness, while maintaining sufficient distance from the edge to preserve structural stability and balance of the first wall part.
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 design enhances the timeliness of pressure relief, thereby improving the reliability of the battery cell by ensuring quicker discharge of pressure, thus reducing the risk of damage and failure.
Implementation Method 1
the discharge medium located at one end, away from the pressure relief mechanism, of the main body part in the shell may flow to the end of the main body part close to the pressure relief mechanism through the channel gap located at the top of the main body part
Implementation Method 2
the pressure relief mechanism is arranged on the first wall part, and along the first direction, a center of the pressure relief mechanism deviates from a center of the first wall part
Data Source
AI summary
A battery cell includes a shell, an electrode assembly, and a pressure relief mechanism, a battery, and an electrical device. The electrode assembly includes a main body part and a tab. The shell includes a first wall part and a second wall part. Along a second direction, the first wall part and the second wall part are arranged opposite to each other. A channel gap is formed between the second wall part and the main body part. The channel gap is configured to connect spaces in the shell that are located at both ends of the main body part along the first direction. The second direction intersects with the first direction. The pressure relief mechanism is arranged on the first wall part, and along the first direction, a center of the pressure relief mechanism deviates from a center of the first wall part.