These look interesting. Caps that push onto the ends of 18650 cells then snap together. Metal bus bars connect the cells in any configuration you want. https://vruzend.com/ There are videos on YouTube from various people testing them. The connection resistance is less than spring clips but higher than spot welded. The cells do get warmer due to the resistance. What I wonder is if a lower temperature solder could be developed for these? Have it melt at the peak temp the cells will hit, then when the solder melts the connection resistance drops, which reduces the temperature below the solder melting point, making the connections permanent.
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