Friends who drive new energy vehicles must have been entangled: fast charging saves time but worries about damaging the battery, slow charging is safe but takes a long time, so which one should I choose? To solve this doubt, you must first understand the principles of fast charging and slow charging.
Slow charging, also known as AC charging. The current passes through the charging pile and first enters the vehicle’s on-board charger, and then charges the battery after conversion. This process is like slowly filling water with a small water pipe. The charging power is generally 3.5kW – 7kW. It may take 6-8 hours to fully charge a car with a range of 500 kilometers. Because the charging current is small and the speed is slow, the chemical reaction inside the battery is more stable, and the loss to the battery is small, just like a long stream of water, which can extend the battery life and is especially suitable for parking at night or for long periods of time.
Fast charging is DC charging, skipping the on-board charger and directly “pouring” a large current into the battery. It is like quickly filling water with a large water pipe. The charging power can reach 50kW or even higher. It can charge the power from 30% to 80% in 30 minutes, greatly saving time. However, high-current charging will increase the internal temperature of the battery and accelerate the decay of active substances in the battery. Frequent use of fast charging is like always drinking a lot of water, which may cause the battery capacity to decrease and shorten its life.
Does that mean that fast charging cannot be used? Of course not! The impact of fast charging and slow charging on the battery depends on the frequency of use and charging habits. Occasionally using fast charging for emergency purposes will cause minimal damage to the battery. But if you rely on fast charging every day, the battery will easily “be overwhelmed”. It is recommended to give priority to slow charging for daily charging to ensure that the battery “flows slowly”; when going on a long trip or in a hurry, use fast charging to solve urgent problems and achieve a combination of fast and slow.
In addition, the health of the battery is also related to the charging range. Try to avoid using less than 10% of the power before charging, and don’t charge it to 100% every time. Stop charging at 80%-90%, which can better protect the battery. Pay more attention to the battery temperature when using the car. When the temperature is high, wait for the battery to cool down before charging, which can also reduce damage.
In short, fast charging and slow charging are like “fast food” and “nutritious meals” for cars. Only by choosing according to needs and matching them reasonably can the battery of your car be more durable and accompany you for a longer distance.
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