Secondary Battery Current Collector Plate for Spatter-Free Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing secondary battery manufacturing process often results in welding spatters due to uneven contact areas during the electrical connection between the electrode assembly and the current collecting plate, leading to potential short circuits and reduced voltage performance.
Innovation Solution
A secondary battery design featuring a current collecting plate with a central portion corresponding to the electrode assembly's core and a peripheral portion with strategically placed through-holes to accommodate the non-coated electrode portion, ensuring uniform contact and reducing the thickness of the welding area, thereby minimizing energy input during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is performed to implement electrical connection between the electrode assembly and the current collecting plate, then electrical connection is achieved, but welding spatters are formed due to large heat input and uneven contact area
Solution Approach 1:
The current collecting plate is designed with a localized protrusion that extends into the electrode assembly. This protrusion creates a concentrated contact area with the non-coated portion of the electrode, ensuring uniform heat distribution during welding. By localizing the contact geometry, the welding heat is evenly distributed across the contact interface, preventing the formation of welding spatters while maintaining reliable electrical connection.
2Strength
If welding is performed with large heat input to ensure electrical connection, then connection strength is improved, but welding spatters increase due to melting of the current collecting plate
Solution Approach 1:
The protrusion on the current collecting plate concentrates the welding contact area, allowing for controlled heat input. The localized geometry ensures that heat is distributed evenly across the contact interface with the electrode's non-coated portion, achieving strong welding connection without excessive heat that would cause plate melting and spatter formation.
3Reliability
If the non-coated portion of the electrode is used for welding, then electrical connection is achieved, but uneven contact area causes welding defects
Solution Approach 1:
The protrusion on the current collecting plate is specifically designed to match the geometry of the non-coated portion of the electrode. This localized geometric adaptation ensures that the contact area is uniform across the entire welding interface, eliminating welding defects caused by uneven contact while maintaining reliable electrical connection.
Solution Approach 2:
The protrusion acts as an intermediary element between the current collecting plate and the electrode assembly. By introducing this intermediate geometric feature, the design mediates the contact interface to achieve uniform pressure and heat distribution during welding, resolving the uneven contact area problem.
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 ensures a uniform welding area, reduces the energy required for welding, and minimizes the risk of short circuits, enhancing the battery's voltage performance and efficiency.
Implementation Method 1
a current collecting plate provided at one end of the electrode assembly at which the non-coated portion of the first electrode is exposed
Implementation Method 2
welding to implement electrical connection between the electrode assembly and the current collecting plate
Implementation Method 3
the current collecting plate is melted because of a large amount of heat inputted
Data Source
AI summary
A secondary battery includes an electrode assembly in which first and second electrodes and a separator provided between the first and second electrodes are wound, the first and second electrodes each including a non-coated portion, exposed to an outside of the separator, and having no active material applied thereto; and a current collecting plate provided at one end of the electrode assembly at which the non-coated portion of the first electrode is exposed, the current collecting plate including a central portion, and a peripheral portion provided around the central portion and configured to adjoin one end of the electrode assembly, in which the peripheral portion includes one or more first through-holes penetrated by at least a part of the non-coated portion of the first electrode. A battery pack having a plurality of the secondary batteries and a vehicle having the battery pack are also provided.