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Hello Electricians and EV enthusiasts,
Could some one explain why traction battery in EVs needs to be High Voltage instead eg. 12V or ~4V (single cell voltage)?
I understand that power is simply V * A. So technically you could have more cells joined in parallel delivering high Amps rather than serially (high Voltage / lover Amps for a given C rate). You should be able to charge / discharge low voltage battery at the same kW rate as high voltage.
Higher voltage increases motor spin rate but you can construct a motor that will simply spin faster / slower for a given voltage (my guess it mostly depends on motor winding but i may be wrong here). Just like transformer.
So why traction batteries cannot be 12 volt?
Could some one explain why traction battery in EVs needs to be High Voltage instead eg. 12V or ~4V (single cell voltage)?
I understand that power is simply V * A. So technically you could have more cells joined in parallel delivering high Amps rather than serially (high Voltage / lover Amps for a given C rate). You should be able to charge / discharge low voltage battery at the same kW rate as high voltage.
Higher voltage increases motor spin rate but you can construct a motor that will simply spin faster / slower for a given voltage (my guess it mostly depends on motor winding but i may be wrong here). Just like transformer.
So why traction batteries cannot be 12 volt?