Battery Connection Member Welding Angle to Prevent Bending
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Solution Overview
Problem
In battery production, thermal shrinkage during welding can cause tensile stress in the connection member, leading to bending and making it difficult to fasten bus bars or similar components, especially when the acute angle between the weld portion and the lid member's center line is small.
Innovation Solution
The battery design includes a swaged portion of the current-collecting terminal member with a weld portion positioned at an acute angle greater than or equal to 45 degrees relative to the lid member's center line, and a battery production mask member with circular holes larger than the swaged end, preventing the connection member from bending by reducing thermal stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the weld portion is positioned close to the center line of the lid member (small acute angle), then the welding process is simpler and more straightforward, but thermal shrinkage causes tensile stress that bends the connection member
Solution Approach 1:
The patent applies local quality by positioning the weld portion at a specific location on the outer peripheral side end portion of the current-collecting terminal member, rather than uniformly distributing welding operations. The acute angle between the connecting line and center line is controlled to be 5 degrees or more, creating a localized welding zone that avoids the center line area where thermal shrinkage would cause bending. This localized positioning strategy maintains manufacturing simplicity while preventing deformation.
2Stability of the object's composition
If the acute angle between the weld portion and center line is increased to reduce bending, then tensile stress from thermal shrinkage is reduced, but the welding process becomes more complex
Solution Approach 1:
The patent applies parameter changes by specifying a quantitative threshold for the acute angle (5 degrees or more) between the connecting line and the center line of the lid member. This parameter control optimizes the welding position to balance two competing requirements: maintaining connection member straightness by avoiding the center line area, and keeping the welding process simple by using a clear, measurable criterion. The swaged portion diameter is also controlled at 0.5mm or less to facilitate precise positioning.
3Manufacturing precision
If the swaged portion diameter is reduced to improve positioning precision, then the weld portion can be positioned more accurately at the required acute angle, but the mechanical strength of the connection may be reduced
Solution Approach 1:
The patent applies parameter changes by setting specific quantitative thresholds: the swaged portion diameter is controlled at 0.5mm or less, and the acute angle is maintained at 5 degrees or more. These parameter specifications optimize both positioning precision and connection strength. The small swaged portion diameter enables accurate positioning on the outer peripheral side, while the controlled acute angle ensures the weld portion is positioned to minimize thermal shrinkage effects, thereby maintaining connection integrity.
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 configuration effectively reduces the occurrence of bending in the connection member, ensuring secure attachment of bus bars and maintaining the structural integrity of the battery during assembly.
Implementation Method 1
At the swaged portion, a second end of the current-collecting terminal member is swaged toward an insertion hole of the connection member
Implementation Method 2
The weld portion is provided between an outer peripheral side end portion of the swaged second end of the current-collecting terminal member and the connection member
Implementation Method 3
thermal shrinkage at the time of welding causes tensile stress in the connection member in the longitudinal direction of the lid member
Data Source
AI summary
A battery includes: an electricity-generating element; an exterior; an external terminal member; a current-collecting terminal member having a first end which is connected to the electricity-generating element and a second end, which extends outward of the exterior; and a platy connection member that, outside the exterior, interconnects the current-collecting terminal member and external terminal member. In the welding between the connection member and an outer peripheral side end portion of a swaged portion in which the second end of the current-collecting terminal member has been swaged toward an insertion hole of the connection member, an acute angle between a connecting line connecting the weld portion to a center of the second end and a longitudinally extending center line of the lid member is greater than or equal to 45 degrees. A production method for the battery and a battery production-purposed mask are also provided.