What are the most used strategies to make e-car batteries be charged faster?

Here are four ways:

1. Better battery cooling. Part of why you can't charge batteries very fast is that they overheat. So better cooling means you can charge them faster.

2. Better battery chemistry. The reason batteries heat up when charging is the electrical resistance of the chemical process. If the chemicals are more electrically conductive the faster the battery can be charged and discharged.

3. Thin film batteries. In a normal battery there's a chemical reaction that has to work it's way through rather thick electrodes. But by making the electrodes super thin the chemical process can be done much quicker.

4. Ultracapacitors. Capacitors don't use a chemical reaction to store electricity and can be charged in a fraction of a second. The problem is getting them to hold as much energy as batteries do while keeping the cost down.

Also keep in mind that with 200 to 300 mile range EVs now available charging time is becoming less of an issue since most people drive only 30mi daily.