Pouch Cell Stacking After Individual Activation for Higher Capacity
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Solution Overview
Problem
Existing secondary batteries face challenges in increasing capacity and efficiently performing activation processes due to increased thickness, requiring modifications to charging/discharging devices and complicating the folding process, especially when multiple cells are involved.
Innovation Solution
A method for manufacturing secondary batteries by individually activating cells with embedded electrode assemblies, stacking and bonding positive and negative electrode leads of multiple cells, and using adhesion or welding to connect them in parallel, allowing use of existing charging/discharging devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple electrode assemblies are mounted in one pouch to increase capacity, then the battery capacity increases, but the folding process becomes more complicated and device modifications are required
Solution Approach 1:
The patent divides the battery into multiple separate cells, each containing a single electrode assembly in its own pouch. This segmentation allows each cell to be individually activated and handled independently, avoiding the complexity of folding multiple electrode assemblies within one pouch while still achieving increased capacity through parallel connection of multiple cells.
2Quantity of substance
If multiple electrode assemblies are mounted in one pouch to increase capacity, then the battery capacity increases, but existing charging/discharging devices cannot be used and device modifications are required
Solution Approach 1:
By segmenting the battery into multiple separate cells with individual pouches, each cell can be connected to existing charging/discharging devices independently. This allows the use of conventional small and medium-sized charging devices without modification, while the parallel connection of multiple cells achieves the desired increased capacity.
Solution Approach 2:
The patent transitions from a single-pouch configuration to a multi-cell stacked configuration. By arranging cells in parallel and connecting them through lead bonding, the system achieves increased capacity without requiring modifications to existing charging devices, effectively adding capacity in a different dimensional arrangement.
3Adaptability or versatility
If cells are individually activated and then stacked, then existing charging devices can be used, but additional bonding steps are required to connect electrode leads
Solution Approach 1:
The patent performs activation of each cell individually before stacking and bonding the electrode leads. This preliminary action ensures that each cell is fully activated and stable before being connected to others, preventing potential issues during the bonding process and ensuring compatibility with existing charging devices. The individual activation step, while adding a process step, simplifies the overall manufacturing by allowing standardized procedures to be applied to each cell independently.
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
Enables the use of existing small and medium-sized charging/discharging devices for secondary batteries with increased capacity by connecting cells in parallel, enhancing charging capacity through additional cells without needing device modifications.
Implementation Method 1
The bonding between the negative electrode leads and the bonding between the positive electrode leads may be performed through welding.
Data Source
AI summary
A method for manufacturing a secondary battery, having an activation process, in which charging/discharging and aging are performed, according to the present invention comprises: a step of providing a first cell and a second cell, each of which has a structure in which an electrode assembly is embedded in a pouch, and a negative electrode lead and a positive electrode lead protrude to the outside of the pouch; a step of stacking the first cell and the second cell; and a step of bonding the positive electrode leads of the first and second cells to each other and bonding the negative electrode leads of the first and second cells to each other, wherein each of the first and second cells is individually activated before the step of providing the first cell and the second cell.