For decades batteries in vehicles were just 12 V led batteries to provide power to start the vehicle and to provide power for the electronic control units in the car. Once you start the car an alternator reloads the battery during drive. 

This electric supply was sufficient for a long time until the drivers of change impacted the entire automotive industry.

The climate, political and structural changes forced the entire automotive industry to invest severely into different concepts for electrification of the powertrain in the vehicle. The goal is to reach zero emission vehicles in the future.

That led to new skills needs (electric powertrain), new car architectures.