Why do lithium batteries in electric vehicles catch fire easily?

Introduction Why lithium batteries of electric vehicles catch fire easily 1. Internal short circuit: Due to overcharge or overdischarge of the battery, dendrites are produced inside the battery, or impurities and Dust during the battery production process accumulates

Why do lithium batteries in electric vehicles catch fire easily?

1. Internal short circuit: Due to overcharge or overdischarge of the battery, dendrites are produced inside the battery, or impurities and dust during the battery production process are produced. accumulate inside the battery, which will puncture the separator and cause a micro-circuit. short circuit. This short circuit will cause the battery temperature to increase, which will trigger more serious chain reactions, such as greater short circuit current and thermal runaway.

2. External short circuit: The external connection point of the battery is damaged due to long-term use or external force, resulting in a short circuit. Even if the battery management system (BMS) is well designed, external short circuits can pose a danger.

3. Problems during storage: Prolonged inactivity will cause the battery to self-discharge,and poor storage environment (such as high temperature and humidity) will also make the internal structure of the battery unstable. , increasing security risks.

4. High external temperature: Lithium batteries are more prone to thermal runaway in high temperature environments. High temperatures can melt the battery separator and cause an internal short circuit, which in turn generates a large amount of heat and electrolyte injection, causing combustion and explosions.

5. Battery quality issues: Using substandard or aging batteries is more likely to cause short circuits and thermal runaway due to material and process issues.

Why doesn't the inverter support lithium batteries?

The general lifespan of electric vehicle batteries is notonly about three years. If an electric vehicle's battery dies, you can do this. choose to replace it with lithium batteries. Of course, you can also choose to exchange the old one for a new one, which you should choose according to your actual situation. Generally, the trade-in price will be cheaper, but the service. life is hard to say. From a safety perspective, maintenance-free lead-acid batteries are safer. Although lithium batteries have larger capacities, they are relatively expensive and have unstable performance, making them prone to problems.

Use the old battery of the original electric car to exchange it for a new one. You can use the old battery for 200 yuan. The lead acid battery can be recycled and is more cost effective if you come across any. an ordinary brand of lead acid battery, you can also use it for two hundred yuans. Three years is no problem, but lithium batteries have no recycling value. Generally, new lithium batteries cost around 7,800 to 1,200 yuan. old battery with a new one, it will cost at least 500 yuan extra. Theoretically, the lifespan of lithium batteries should be longer. According to the manufacturer, lithium batteries can be used for approximately five years.

If it is a lead-acid battery, replacing it every two years costs 300 RMB. It must be replaced at least twice in five years, which costs 600 RMB. However, it should be noted that it is difficult to say whether lithium batteries can be used for five years, so it is better to replace lead-acid batteries. Although their lifespan is short, their price is also cheap. In addition, the quality of electric vehicle lithium battery brands on the market is unevenand prices are also unstable. There is no guarantee that the lithium batteries you buy are products from regular manufacturers, let alone that they can be used for five years. They can be discarded after three years, so if you want to replace the lithium battery, it depends on your luck.

In terms of safety, lithium batteries have unstable performance and can easily explode due to external factors. They also need to use a special charger and pay attention to the charging time. Some people like to charge the night before. go to work in the morning. Turn off the power. Lithium batteries are easily overcharged and damaged. This will damage battery life, but lead acid does not have these problems. So, if the electric vehicle battery is no longer usable, you can always choose to exchange it for a new batterylead erie. For the moment, it is very profitable.

The voltage is unstable. The voltage variation range of lithium batteries is relatively wide. The voltage is generally between 3.0V and 4.2V during charging, but the voltage may be lower than 3.0V during discharging, which may have an adverse effect on the stability of the inverter. The inverter must operate at a higher voltage level. If the voltage fluctuation of the lithium battery is unstable, it will easily cause the inverter to have unstable current fluctuations, which will affect the normal operation of the inverter and even cause damage to the inverter. . The inverter therefore does not support lithium batteries.

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