Does frequent use of fast charging harm the car battery?

Under the “close care” of various visions and various voices, new energy vehicles have come to us with ups and downs. Although the beginning of the road is difficult to walk, the snowball of new energy is getting bigger and bigger, not only successfully entering the homes of ordinary people, but also making China the country with the largest sales of new energy vehicles in the world.

Under the “close care” of various visions and various voices, new energy vehicles have come to us with ups and downs. Although the beginning of the road is difficult to walk, the snowball of new energy is getting bigger and bigger, not only successfully entering the homes of ordinary people, but also making China the country with the largest sales of new energy vehicles in the world.

Does frequent use of fast charging harm the car battery?

For consumers, when buying a new energy vehicle, the most concerned topic is its cruising range. Nowadays, with the continuous upgrading of technology, the cruising range has also increased accordingly. Especially this year, the cruising range of electric vehicles in general has reached the level of 400-500km, which has eliminated everyone’s anxiety about battery life. In addition to the cruising range, another major factor affecting consumers’ car purchase is the charging speed.

Under normal circumstances, the car will be marked with “slow charging time” and “fast charging time”. Among them, the fast charging time is the biggest point of competition among major car companies. The shorter the fast charging time, the better the sales and the attention higher. We can often see these words in the press release: “A certain electric car is called the VIVO of the automotive industry. It can last for two hours after charging for five minutes. From then on, say goodbye to the trouble of long charging.” , Who said electric cars are unreliable?”

It can be seen that whoever has a shorter fast charging time has more gimmicks in front of consumers. Since fast charging is so powerful, why is there a slow charging? As the saying goes: Haste is not enough. In fact, the same is true in the field of pure electric vehicles (at this stage). Although fast charging can shorten the charging time, it is also more harmful to the battery. Isn’t it a little surprising that fast charging actually hurts the battery? Today, let’s talk about this topic.

First of all, before solving this problem, let’s understand the difference between slow charging and fast charging. We all know that slow charging uses AC power, and the time to fully charge is generally 6-8 hours. In this charging mode, the battery suffers the least damage. Compared with slow charging, fast charging is an emergency charging method. It uses high-power DC charging (also AC fast charging). The voltage of this DC charging is generally greater than the battery voltage, and a large amount of current ions will also A very fast, very efficient flow of speed from the positive electrode to the negative electrode of the battery completes the process of fast charging.

To put it simply, the principle of fast charging is like a small bottle that should be filled with the smallest water flow. In order to reduce the time, you can open it to the maximum. Of course, you can fill a lot at once, but such a large flow of water is also harmful to the water bottle. big impact. That is to say, in the case of long-term fast charging, the actual battery voltage is very high. Under such a high voltage state, the battery will definitely be affected.

Does frequent use of fast charging harm the car battery?

After talking about the difference between slow charging and fast charging, we also need to understand the battery. At present, the batteries carried by electric vehicles are generally lithium batteries and lead-acid batteries. Different batteries have different power generation mechanisms, and there are also great differences in the sensitivity to fast charging.

For example, when a lead-acid battery is being charged, the internal electrolyte will gradually react and decrease, eventually causing the battery capacity to gradually decrease and the cruising range to decrease. Although slow charging will also reduce the battery capacity, the speed is relatively slow and the damage caused is also small.

After talking about lead-acid batteries, let’s take a look at the ternary lithium batteries that are mostly used in new energy vehicles on the market. The characteristics of this battery are light weight and high power. However, it also has certain disadvantages, that is, if thermal runaway occurs during use, it is easy to cause fire and explosion. Closer to home, when the vehicle is fast charging, a relatively large current will be instantaneously input into the battery, which will affect the battery’s ability to restore. The reduction ability of the battery is reduced, so that the decay rate of the battery of the car will increase, which in turn affects the battery life and overall performance.

At the same time, the charge-discharge rate of lithium batteries is also worthy of attention. Among them, it refers to the charge and discharge current within the unit rated capacity. When a battery with a rated capacity of 100Ah is charged and discharged with 20A, its charge-discharge rate is 0.2C. Generally, the charging current of lithium batteries is set between 0.2C and 1C. The larger the current, the faster the charging, but at the same time, the more serious the battery heating phenomenon, and even lead to the occurrence of spontaneous combustion.

Although fast charging is harmful to the battery, you don’t need to worry too much. Because, in order to reduce the damage of fast charging to the battery, engineers have invented a very important component – the BMS power management system. For electric vehicles, BMS is the core component of fast charging. The main function of BMS is to intelligently manage and maintain each battery unit, prevent the battery from overcharging and overdischarging, prolong the service life of the battery, and monitor the status of the battery.

Does frequent use of fast charging harm the car battery?

To put it simply, according to the current state of the battery, the BMS adopts an intelligent control algorithm to implement segmental adjustment of the charging current pulse width, intermittent time, and discharge current pulse, modulates an appropriate current and voltage to complete the charging, and reduces the speed as low as possible. Charge damage to the battery, so these damages are negligible for a limited time.

In general, fast charging any battery will damage the battery. But if the battery density, materials, temperature, and battery management systems of electric vehicles are very well designed, then the damage will be within a reasonable range. To keep the battery life long, use fast charging as little as possible, and do not overdischarge and overcharge. If you want to protect the battery, it is better to use slow charging more.

At the end of the article, I will share with you a little knowledge about extending battery life. When conditions permit, everyone try to use slow charging, which can minimize battery damage. Occasional weekend trips or long-distance driving, it is not a problem to use fast charging two or three times a week. In addition, if conditions permit, it is best to ensure that the vehicle has a chance to fully discharge once a month, which will help the battery life in the long run.

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Author: Yoyokuo