Tata Tiago.ev : DC Fast Charging Test

So the Tata Tiago EV is a new EV by Tata Motors that runs on a 400 volt architecture. In this video we are going to test the cars charging rate. The curb of the charging and how many amps the car can take Im hoping to get the answers to two questions. First, how much Peak power can the Tata Tiago EV take and for how long can that Peak power be maintained? Question number two: will we see a rapid decline in the charging rate after the battery is 80 charge? Lets talk about what were working with here, the Tata Tiago EV variant, which we received, has a 24 kilowatt hour battery pack. Our assumption is, we will be charging the Tiago EB at around 1C, so we expect it to accept around 19 kilowatt Peak power. According to our recent test, the Tata Tiago EV has a range of approximately 180 kilometer with a mix of Highway and City Driving. We reached the hotel with about eight percent SOC remaining. The ambient temperature was about 30 degrees Celsius. That is when we plugged in the car now that the car has started charging lets see how this Tata power charging station performs Music foreign Music, since we plugged in we reached here. If you remember, with eight percent, the range has now gone up to 50, so it charged about 42 percent in 30 minutes uh. What that tells me is that if I reach a fast charger a bit about 10 battery remaining, I can get about 100 kilometers of range back in 30 minutes, and I should add that this fast charger is charging at the rate of 17 kilowatts.

Foreign Music has been stable at 53 amps. So far, however, we are going to charge the car to 100 entirely so lets see if that data changes so stay tuned. Okay, next update the car has been charging for about 50 minutes, its gone up to 80. If you notice that theres not been much of a drop in the current from 53 amp, its gone down to 50 amp final update, the soc is now at 95, very close to finishing charging after it reached 85 percent uh the the currents load way down and Right now, its at eight amps, so uh thats, why its taking longer to reach 100 here are some graphs that will show you how the charging is working. Music lets look at the graph where we show the power at which the Thiago EV was charging from eight percent SOC to 100 SOC as a 30 kilowatt Tata power charger. As you can see, the Tiago EV with the 24 kilowatt R battery pack can Peak at around 18 kilowatts. So, even if you go to a 60 kilowatt or 120 kilowatt DC charger, the peak will always remain at around 18 kilowatt after 80. The Thiago evs BMS accepts a lower power and you can see the rate of charging decreasing rapidly after 90, the charging speed plummets and after 95 percent, its lower than 3.3 kilowatt AC charging. Many of you may be wondering why not charge faster. Why not charge a 30 kilowatt or 60 kilowatt and Achieve faster charging times? The answer to that question boils down to one thing: protecting the battery pack.

What youve observed is the electric car and BMS designers try to DC fast charge it around one C rate, and if cars have a higher voltage architecture, then they charge a 2C. The C rate is the unit battery experts used to measure the speed at which a battery is fully charged or discharged. For example, charging at a C Ray to 1C means that the battery is charged from 0 to 100. In one hour, a sea rate higher than 1C means a faster charge. For example, a 3C rate is three times faster, so a full charge would take place in 20 minutes in India. Most electric cars with the 400b architecture charge it around 1C. The only car we have seen charging a 2C was the Kia ev6, which uses an 800 volt architecture, higher C rates increase the rate of degradation in the battery reducing range and shortening the vehicle lifespan. Faster charging can also cause dangerous dendrites to form these arent. The battery life span can lead to cell failure and in some extreme cases, have been known to cause fires. Now that weve understood the limitations lets look at the next graph, the current is being pumped into the Thiago evs battery. The more current you see here, the faster you can charge the electric cars battery. As you can see, the Tiago EV hits Peak current, pretty quickly, 60 SOC after 75. Soc there is a decrease in the current demanded by the BLS and after 90.

There is a dramatic drop in the current demand. The voltage graph confirms that the Thiago EV uses a 400 volt architecture and it remains steady from start to end. These graphs tell me that the Tiago evs BMS has a very similar design to that of the Nexon EV Max they dont want to cause stress to the lfp cells as more heat builds up as the state of charge increases. The BMS plays save by reducing the current Supply. So what have we learn? Weve learned that when the car is at about 10 percent SOC or under 10 SOC to go from 10 to 50, it takes about half an hour and you get 100 kilometers of range. So thats quite practical uh, its good for a quick top up uh after 85. The current slows way down so uh. It doesnt really make a lot of sense to charge your car to a 100 percent unless youre really desperate to do so its fine to charge. It just to 80 and thats good enough to get you to most of the places where you need to go.