What is auxiliary battery & how does it work?

As vehicles are getting electrified and more intelligent, the energy consumption of the auxiliary system increases rapidly. The auxiliary battery acts as the backbone of the system to support the proper operation of the vehicle.

How do auxiliary battery systems integrate with a high-voltage propulsion battery?

Battery Management Complexity: Integrating an auxiliary battery system with the high-voltage propulsion battery requires sophisticated battery management systems (BMS) to ensure seamless operation. Balancing the charge and discharge cycles of both battery systems adds to the complexity of the overall vehicle design. 2.

Do auxiliary batteries need energy management?

It is important to ensure the auxiliary battery has enough energy to meet the basic loads regardless the vehicle is in park or running. However, the existing methods only focus on auxiliary energy management when the vehicle is in a dynamic event.

What is the auxiliary battery charging strategy?

The strategy would temporarily turn down the auxiliary loads based on their priorities and charge the auxiliary battery at the maximum efficiency. This proposed strategy would allow the vehicle to make intelligent decisions on charging the auxiliary battery.

Do EVs need auxiliary batteries?

In EVs, while there is no traditional engine to start, the vehicle’s low-voltage systems need to be activated before the high-voltage propulsion battery can power up the motors. The auxiliary battery is responsible for powering the systems that manage the activation of the high-voltage system.

Does our auxiliary battery strategy close the technology gap?

Simulation results indicate that our strategy closes the technology gap that is not addressed by the existing methods. As a result, the energy consumption remains low while the SOC of the auxiliary battery is sustained.