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The 12V battery serves as a power source for numerous electronic control units and other electromechanical components, including the electric motor starting system. Employing a 12V electrical supply in automobiles ensures user safety and simplifies battery management systems for electric vehicles. Moreover, the high level of synchronization aids in cost savings by avoiding the need to change power supply chains or requiring manufacturers to convert power from the vehicle's main battery.Because of its responsibility for operating various low-voltage electrical systems, the 12V battery in electric cars remains an extremely critical component. For instance, if the battery malfunctions or deteriorates, you won't be able to start an electric vehicle to initiate the recharging process or move the vehicle (similarly to internal combustion engine cars).Why do electric cars still require 12V power to start?
While 99% of the energy supplied to electric car motors comes from 400V or 800V sources from the main battery pack, the construction of electric motors necessitates a 12V current to supply the electromagnetic field (Maxwell's field), enabling the motor to initiate rotation. Thus, any malfunction in the electric car's 12V power system, such as depletion or damage, renders the vehicle unable to start and move, even if the main battery pack is fully charged.How is the 12V battery on an electric car charged?
Contrary to internal combustion engine vehicles, electric cars employ a circuit board to convert power from the main battery down to approximately 14 volts (usually 13.7 volts) to charge the 12V auxiliary battery. The paradox lies in its operation only when the motor is running, so if the auxiliary battery runs low or dies for any reason, you still cannot start the vehicle to charge the 12V battery. Another straightforward and fundamental charging method is when the car is plugged into the main battery, concurrently charging the 12V battery. If your car unexpectedly runs out of battery and fails to start at home, you can use a home charger to charge the car, and at this point, the 12V battery is also being charged.What sets apart the 12V battery for electric cars from those for internal combustion engine vehicles?
There's no difference here; the purpose remains to provide 12V power to the vehicle's system. Depending on the total power consumption of onboard devices, each manufacturer will calculate and choose a battery with corresponding capacity. You can still choose between dry or wet battery types.Currently, only Tesla is a brand that has transitioned to using Lithium-ion 12V batteries to increase longevity.
