Current Collector Groove Reinforcement for Battery Welding Reliability
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Solution Overview
Problem
The existing current collecting members in power batteries have a through groove that weakens the structural strength, affecting their service life and reliability due to material reduction for cost savings.
Innovation Solution
A current collecting member with a through groove featuring protrusions along its outer circumference, a protection member, and an accommodating groove, which enhances structural strength, fatigue resistance, and welding reliability, while maintaining reduced material usage and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a through groove is opened on the main body of the current collecting member to reduce production costs, then material usage and cost are reduced, but the strength of the main body structure is weakened
Solution Approach 1:
The patent applies local quality by adding protrusions at specific locations (outer circumference of the through groove) to locally reinforce the structure. The protrusions are strategically positioned to provide mechanical support exactly where the through groove creates weakness, while maintaining material reduction in other areas of the current collecting member.
Solution Approach 2:
The protrusions are pre-formed as integral parts of the current collecting member during manufacturing, before assembly into the battery. This preliminary action of creating reinforcing features during the forming process ensures structural strength is built-in from the start, eliminating the need for additional strengthening components or post-processing operations.
2Loss of substance
If a through groove is opened on the main body of the current collecting member to reduce production costs, then material usage and cost are reduced, but the service life of the current collecting member is affected
Solution Approach 1:
The protrusions provide localized reinforcement at the vulnerable through groove region, preventing stress concentration and crack propagation that would otherwise occur at the groove edges. This local quality enhancement specifically addresses the durability issue at the weakest point while maintaining overall material efficiency.
Solution Approach 2:
The protrusions act as preemptive reinforcement features that cushion and distribute mechanical stresses before they can cause damage to the through groove structure. By providing this protective geometry in advance, the design prevents fatigue failure and extends the service life of the current collecting member.
3Strength
If protrusions are added along the outer circumference of the through groove to enhance structural strength, then the strength and fatigue resistance are improved, but the device complexity increases
Solution Approach 1:
The protrusions are merged with the main body of the current collecting member as integral features, formed in the same manufacturing process without requiring separate components or assembly steps. This merging approach adds structural complexity only where needed while avoiding the complexity of additional parts, fasteners, or assembly operations.
Solution Approach 2:
The protrusions serve multiple functions simultaneously: they reinforce structural strength, improve fatigue resistance, and can also serve as positioning or alignment features during assembly. This multi-functionality justifies the added geometric complexity by delivering multiple benefits from a single design feature.
Data Source
Figure 1
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AI summary
The disclosure belongs to the technical field of secondary batteries, and discloses a current collecting member, a battery and a battery manufacturing method. The current collecting member includes a connecting structure (1), the connecting structure (1) includes a through groove (11), the through groove (11) extends along the length direction of the connecting structure (1), and the edge of the through groove (11) is provided with a protrusion (111). The structural strength of the main body of the current collecting member of the present disclosure is high.