firsttruck
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Tesla battery day presented multiple technologies & processes of which 4680 size form factor is only one. Using term 4680 can cause confusion if more context is not given.
4680 is primarily a size but has also been used as a short-hand name for the entire suite of technologies announced on Tesla battery day. However not all these technologies are required for 4680s.
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Technologies & processes:
4680 size form factor ( 46mm diameter by 80mm height )
Tab-less (which should really be called continuous multi tabs)
DBE ( Dry Battery Electrode coating, derived from work of Maxwell Technologies)
Higher levels of silicon in anode
Tesla choosing chemistry based on cost & range needs for specific Tesla model.
1. LFP (LiFePO4, no Cobalt)
2. Nickel / Manganese / some Cobalt
3. High Nickel with no Cobalt
Cooling from bottom of cells (previously Tesla had cooling tubes between cells)
Structural battery pack
Stream-lined non-stop system of fabrication ( processes like used in food or printing industries)
Stream-lined batched system to do cell testing & initial charging
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I think "Tab-less" is probably the only technology that probably required for 4680 form factor.
4680s could be made without "Tab-less" but then many disadvantages from longer linear length of material in larger diameter cell forms are exhibited.
Most all of the technologies could be used with LFP chemistry.
Some of the technologies are more bleeding edge than others. The most problematic are probably the DBE & high silicon anode and so these two might not be implemented in some early 4680 based products from some manufacturers.
Not all 4680s manufacturers will have all the technologies in every 4680 models.
Early model 4680s with LFP when used in Teslas might only use
1. 4680 size form factor
2. Tab-less (which should really be called continuous multi tabs)
3. Cooling from bottom of cells (previously Tesla had cooling tubes between cells)
4. Structural battery pack
4680 is primarily a size but has also been used as a short-hand name for the entire suite of technologies announced on Tesla battery day. However not all these technologies are required for 4680s.
----------------------
Technologies & processes:
4680 size form factor ( 46mm diameter by 80mm height )
Tab-less (which should really be called continuous multi tabs)
DBE ( Dry Battery Electrode coating, derived from work of Maxwell Technologies)
Higher levels of silicon in anode
Tesla choosing chemistry based on cost & range needs for specific Tesla model.
1. LFP (LiFePO4, no Cobalt)
2. Nickel / Manganese / some Cobalt
3. High Nickel with no Cobalt
Cooling from bottom of cells (previously Tesla had cooling tubes between cells)
Structural battery pack
Stream-lined non-stop system of fabrication ( processes like used in food or printing industries)
Stream-lined batched system to do cell testing & initial charging
----------------------
I think "Tab-less" is probably the only technology that probably required for 4680 form factor.
4680s could be made without "Tab-less" but then many disadvantages from longer linear length of material in larger diameter cell forms are exhibited.
Most all of the technologies could be used with LFP chemistry.
Some of the technologies are more bleeding edge than others. The most problematic are probably the DBE & high silicon anode and so these two might not be implemented in some early 4680 based products from some manufacturers.
Not all 4680s manufacturers will have all the technologies in every 4680 models.
Early model 4680s with LFP when used in Teslas might only use
1. 4680 size form factor
2. Tab-less (which should really be called continuous multi tabs)
3. Cooling from bottom of cells (previously Tesla had cooling tubes between cells)
4. Structural battery pack
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