Single-Pouch Battery Cell Assembly Without Welding Contamination
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Solution Overview
Problem
Conventional battery manufacturing faces issues such as defect propagation, fire hazards due to large electrolyte amounts, and metal contamination during welding processes.
Innovation Solution
The use of single pouch battery cells, where each cell consists of an anode, cathode, separator, and electrolyte enclosed in a pouch, reduces defect propagation, minimizes fire hazards by containing electrolytes, and prevents metal contamination by shielding electrodes during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple stacks are connected in parallel within a single pouch to increase capacity, then the battery capacity increases, but the amount of electrolyte increases proportionally leading to increased fire hazards
Solution Approach 1:
The patent divides the battery system into multiple independent pouches, each containing a single stack. This segmentation isolates the electrolyte in each pouch, so that if one pouch experiences thermal runaway, the fire cannot propagate to other pouches. Each pouch acts as an independent containment unit, reducing overall fire hazard while maintaining the desired capacity through parallel connection of multiple pouches.
2Quantity of substance
If multiple stacks are placed in a single pouch, then the battery capacity increases, but defects can propagate across all stacks within the pouch
Solution Approach 1:
Each stack is enclosed in its own separate pouch, creating physical and chemical isolation barriers. If a defect occurs in one stack (such as dendrite formation, internal short circuit, or electrode degradation), it remains confined to that single pouch and cannot affect other stacks. This segmentation strategy maintains system reliability while achieving desired capacity through parallel assembly of multiple independent pouches.
3Power
If battery cells are joined through welding of tabs and bus-bars to form modules, then the desired power and capacity are achieved, but metal contamination occurs during welding processes
Solution Approach 1:
The patent replaces the welding process with a mechanical compression system. Conductive plates are pressed against the tabs of multiple pouches using compression force, creating electrical connections without any welding. This eliminates metal particulate contamination that would otherwise be generated during welding operations, while still achieving the necessary electrical connectivity for desired power output.
4Device complexity
If a large number of stacks are placed in each pouch, then fewer pouches are needed, but the amount of welding and joining required increases significantly
Solution Approach 1:
The patent adopts a compression-based assembly approach where multiple single-stack pouches are stacked and compressed together with conductive plates. This mechanical connection method is simpler and more scalable than welding, as it requires no specialized welding equipment, generates no contamination, and allows for easier assembly and disassembly. The manufacturing process becomes more straightforward despite the increased number of pouches.
Data Source
AI summary
Apparatus, systems, and methods described herein relate to the manufacture and use of single pouch battery cells. In some embodiments, an electrochemical cell includes a first current collector coupled to a first portion of a pouch, the first current collector having a first electrode material disposed thereon, a second current collector coupled to a second portion of the pouch, the second current collector having a second electrode material disposed thereon, and a separator disposed between the first electrode material and the second electrode material. The first portion of the pouch is coupled to the second portion of the pouch to enclose the electrochemical cell.