Battery Lid Welding Sequence to Protect the Pressure Release Valve
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Solution Overview
Problem
The existing method of welding the inversion plate to the lid main body in secondary batteries can generate heat that deforms the pressure release valve, leading to potential issues with the battery's structural integrity.
Innovation Solution
The method involves starting the welding of the inversion plate to the lid main body from an opposite portion opposite to the pressure release valve and ending it at the same opposite portion, creating a protruding weld portion radially and a periphery weld portion along the edge, thereby minimizing heat input to the pressure release valve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the inversion plate is welded to the lid main body using conventional welding methods, then the inversion plate is securely fixed to the lid, but heat generated during welding may be transmitted to the pressure release valve causing deformation
Solution Approach 1:
The patent applies preliminary action by positioning the inversion plate such that the pressure release valve is located away from the welding area before welding begins. This pre-positioning ensures that the heat-affected zone does not include the pressure release valve, preventing deformation while maintaining secure fixation.
Solution Approach 2:
The patent applies local quality by concentrating the welding heat input only in specific areas away from the pressure release valve. The welding is performed at designated locations on the inversion plate that are spatially separated from the pressure release valve, ensuring that the local thermal effects do not affect the valve's precision and geometry.
2Ease of manufacture
If welding is performed on the inversion plate, then the inversion plate is securely attached to the lid main body, but the heat input may cause deformation of the pressure release valve
Solution Approach 1:
The patent applies preliminary action by pre-positioning the pressure release valve away from the welding area before the welding process begins. This ensures that the valve is not exposed to harmful heat input during welding, maintaining its functional reliability while allowing the welding process to proceed easily.
Solution Approach 2:
The patent applies the intermediary principle by using the spatial arrangement and positioning structure as a mediator between the welding process and the pressure release valve. The inversion plate's geometry and positioning features act as an intermediary that allows welding to be performed without directly transmitting heat to the valve, thus protecting its reliability.
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 approach effectively suppresses heat input to the pressure release valve during welding, preventing deformation and ensuring the structural integrity of the power storage cell.
Implementation Method 1
there is a concern that heat generated during the welding may be transmitted to the notch to result in deformation or the like of the notch
Data Source
AI summary
A method of manufacturing a power storage cell includes: preparing a case main body, a lid main body, and an inversion plate; welding the inversion plate to the lid main body; and connecting the lid main body to an opening of the case main body. The lid main body prepared in the preparing includes a pressure release valve. In the welding, the welding of the inversion plate to the lid main body is started from an opposite portion of the inversion plate that is located opposite to a side of the inversion plate facing the pressure release valve, and after welding a periphery of the inversion plate, the welding of the inversion plate to the lid main body is ended at the opposite portion.