Please comment on this proposed build.
After reading thru some of the fire / burn threads I changed my design to incorporate space between the battery that can be flooded with water in case of an emergency.
The frame is welded from bed frame angle iron. 3/8" wood in the bottom and 1/16" pvc sheets on the side to prevent the cells to contact the steel frame..strips of 1/16" rubber roofing glued with pieces of double side tape to separate the cells from each other.
To avoid mechanical stress on the terminal I propose two layers of braided tinned copper in diagonal. Thought is here larger distance/ surface allowed for better thermal separation between cells and at the same time allows more flexibility.
Used stainless studs without starter threads as to give maximum resistance against pulling out the aluminum thread.
To avoid or better limit current thru the stud I want to use an insulating washer between the top of the braided wire and the compression nut. This I hope will limit potential heat generation in the stud.
My other thought is that the flat braided strip will make multiple contacts with the aluminum battery terminal.
The stud that is supposed to carry no current will have the bms wiring on top thru the red ring terminal.
The idea with the rubber roofing strip is to allow space between the cells to insert temp sensors and in an emergency the ability to cool the cells with pouring water over them.. emergency only!
The steel frame is a tight fit, the last cell will have to be pushed in. There is no space for the cells to expand.
Please give me your thoughts about the proposed approach.
The next one I would like to build in an aluminum or even stainless box that can better contain a thermal runaway event and also that I can flood the box with water to reduce the chance of more cells getting affected.
After reading thru some of the fire / burn threads I changed my design to incorporate space between the battery that can be flooded with water in case of an emergency.
The frame is welded from bed frame angle iron. 3/8" wood in the bottom and 1/16" pvc sheets on the side to prevent the cells to contact the steel frame..strips of 1/16" rubber roofing glued with pieces of double side tape to separate the cells from each other.
To avoid mechanical stress on the terminal I propose two layers of braided tinned copper in diagonal. Thought is here larger distance/ surface allowed for better thermal separation between cells and at the same time allows more flexibility.
Used stainless studs without starter threads as to give maximum resistance against pulling out the aluminum thread.
To avoid or better limit current thru the stud I want to use an insulating washer between the top of the braided wire and the compression nut. This I hope will limit potential heat generation in the stud.
My other thought is that the flat braided strip will make multiple contacts with the aluminum battery terminal.
The stud that is supposed to carry no current will have the bms wiring on top thru the red ring terminal.
The idea with the rubber roofing strip is to allow space between the cells to insert temp sensors and in an emergency the ability to cool the cells with pouring water over them.. emergency only!
The steel frame is a tight fit, the last cell will have to be pushed in. There is no space for the cells to expand.
Please give me your thoughts about the proposed approach.
The next one I would like to build in an aluminum or even stainless box that can better contain a thermal runaway event and also that I can flood the box with water to reduce the chance of more cells getting affected.