tmho
1 kW
I am going to build my first diy battery pack for my ebike. It will be 14s4p. Normal current needed is 10-15A. Maximum current is 20A. I will install the cells inside a battery case bought from taobao.com.
I am planning to buy the Sunkko 737G+ for spot welding. Any comments on this spot welder?
I am planning to buy the cells from tumich (https://endless-sphere.com/forums/viewtopic.php?f=31&t=61608). Will those cells with signs of removing welds difficult to spot weld? What should I pay attention to when doing the spot welding on those cells with signs of removing welds?
The battery case is with a cell holder. The cell holder is designed to use strip with width of 6mm maximum for cells connection. Will a single 0.15mm x 6mm pure nickel strip be good enough for my purpose?
I have heard from the seller of the 737G+ that spot welding 2 pure nickel strip is very difficult. Is this correct? If yes, then how can I make the connection between each group of cells. Will nickel plated strip be okay for my purpose and good for welding two strips together?
The connectors of the battery case for connecting to the cells are something like stainless steel or plated metal. Any suggestion in making good soldering to those connectors?
View attachment 1
I am planning to buy the Sunkko 737G+ for spot welding. Any comments on this spot welder?
I am planning to buy the cells from tumich (https://endless-sphere.com/forums/viewtopic.php?f=31&t=61608). Will those cells with signs of removing welds difficult to spot weld? What should I pay attention to when doing the spot welding on those cells with signs of removing welds?
The battery case is with a cell holder. The cell holder is designed to use strip with width of 6mm maximum for cells connection. Will a single 0.15mm x 6mm pure nickel strip be good enough for my purpose?
I have heard from the seller of the 737G+ that spot welding 2 pure nickel strip is very difficult. Is this correct? If yes, then how can I make the connection between each group of cells. Will nickel plated strip be okay for my purpose and good for welding two strips together?
The connectors of the battery case for connecting to the cells are something like stainless steel or plated metal. Any suggestion in making good soldering to those connectors?
View attachment 1