Battery Cell Pressure Relief Welding Structure for Leak Prevention
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Solution Overview
Problem
The existing battery cells face issues with poor stability and safety during use, leading to a shorter service life due to internal thermal runaway and potential liquid leakage from welding stress.
Innovation Solution
The battery cell design includes a casing with a mounting hole and a pressure relief mechanism, where the outer peripheral surface of the pressure relief mechanism is welded to the casing, and annular grooves on the casing and pressure relief mechanism provide deformation space for welding stress, enhancing the structural strength and reducing the risk of liquid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief mechanism is welded to the casing to ensure secure mounting, then the reliability of pressure relief is improved, but welding stress causes cracks and reduces the service life of the pressure relief mechanism
Solution Approach 1:
The patent applies beforehand cushioning by designing a mounting structure with a mounting hole that has a first hole wall surface and an annular groove. The annular groove acts as a stress relief feature that absorbs and distributes welding stress before it can concentrate and cause cracks in the pressure relief mechanism, thereby extending its service life while maintaining reliable mounting.
2Strength
If welding is performed to secure the pressure relief mechanism, then the structural strength of the mounting connection is improved, but welding stress causes liquid leakage from the battery cell
Solution Approach 1:
The mounting hole structure with annular groove provides beforehand cushioning by creating a stress-distributing geometry that prevents welding stress from concentrating at the weld zone. This eliminates the root cause of welding-induced cracks that would otherwise lead to liquid leakage, thereby maintaining connection strength while preventing harmful leakage.
3Reliability
If the pressure relief mechanism is securely mounted to the casing, then the safety of the battery cell is improved, but the welding stress reduces the stability of the battery cell
Solution Approach 1:
The annular groove in the mounting hole structure provides beforehand cushioning by absorbing welding stress through its geometric design. This prevents stress concentration that would compromise the structural integrity and stability of the battery cell, thereby maintaining both safety through secure mounting and stability through stress distribution.
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 improves the service life of the battery cell by reducing the impact of welding stress on the pressure relief mechanism and lowering the risk of liquid leakage, thereby enhancing the safety and reliability of the battery cell.
Implementation Method 1
an outer peripheral surface of the pressure relief mechanism is welded to the first hole wall surface
Data Source
AI summary
Provided are battery cell, battery, and electric device. The battery cell includes a casing and a pressure relief mechanism. The casing is provided therein with an accommodating space configured to accommodate an electrode assembly, wherein the casing is provided with a mounting hole in communication with the accommodating space, and the mounting hole is provided with a first hole wall surface extending along a circumferential direction of the mounting hole. The pressure relief mechanism is arranged in the mounting hole, wherein an outer peripheral surface of the pressure relief mechanism is welded to the first hole wall surface. The casing is provided with a first annular groove, and the first annular groove surrounds an outer side of the first hole wall surface; and/or the pressure relief mechanism is provided with a second annular groove, and the first hole wall surface surrounds an outer side of the second annular groove.