When it comes to charging, the Rivian can get as much as about 220 kW charging rates, but he then explains that there are two ways to get an EV to not achieve its best charging.
One thing you can do is drive the crap out of it. Racing, lots of hard acceleration and braking, and other hard driving cycles can cause a lot of heat buildup that thermal management systems can struggle to keep cool, or fail to keep cool. To prevent damage or fire, the car eventually cuts back how much power it can deliver — or charge. This is usually an inverter or motor issue, but batteries can overheat eventually.
An inverter or motor doesn’t have a lot of thermal mass, so they should be able to cool off fairly quickly once they’re not asked to work so hard. But, batteries are another thing entirely. Once heat builds up in them, it can take an overworked or inadequate cooling system some time to remove the heat. The problem is, if you’re highway driving, you go straight from driving fast to the charging station, and you arrive with a battery that’s already too hot.
So, the car throttles charging speeds back to protect the battery from damage or unplanned internal combustion. In the case of the Rivian, he’s seeing it throttle charging speeds that should exceed 200 kW get cut back to as little as 90 kW. And, this can happen in winter temperatures — in Colorado! The battery charging speed doesn’t start out slow, but after a few minutes of charging it drops speeds, showing that heat had built up during the charge and exceeded the allowable temperatures for maximum charging speeds. He figures that the vehicle probably isn’t running the cooling system as aggressively as it could early in the charge or when pulling up to stations.He thinks that the battery pack probably has a few cells that aren’t getting as good a cooling as the rest of them.
For now, it might not be a good idea to not precondition the battery for the first charging stop on a road trip with a Rivian in winter. Future software updates could fix this.In the past, Rivian vehicles had a secret menu where you could get all of the vehicle’s data, including things temperature sensors for different parts. But, with a software update, the secret menu and app disappeared.
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