We know that lithium batteries are widely used in power and energy storage fields due to their light weight, high energy density, and environmental protection. However, there are very few lithium batteries in the car battery. Lithium iron phosphate batteries replace lead-acid batteries, but lead-acid batteries still dominate the automotive industry. Why?

First of all, safety.

The reason why lithium batteries have not been popularized in the field of automotive batteries is largely due to "safety", which is not unrelated to the properties of lithium batteries. It is understood that the discharge temperature of lithium batteries is -20 degrees Celsius to 60 degrees Celsius, and the charging temperature is 0 degrees Celsius to 45 degrees Celsius, and collisions can easily cause fire and explosion. It can be said that lithium batteries are most afraid of high and low temperatures. Of course, lithium iron phosphate batteries have successfully overcome this problem.

Netizens who have opened the hood know that the temperature of the engine of a traditional fuel vehicle is very high when it is working, and it is necessary to maintain an optimal operating temperature. In order to maintain this range, the engine cylinder will transfer excess internal heat through various channels. To the engine compartment, leading to the outside of the car. At this time, the temperature of the engine compartment can be imagined.

What's more, many vehicles are now equipped with turbochargers, and turbocharging is driven by engine exhaust, and the temperature is generally 400-500 degrees Celsius. Such high temperatures are undoubtedly a disaster for ordinary lithium batteries.

In addition to temperature, impact compression is also unbearable for lithium batteries. We know that most car batteries are arranged in the car’s engine compartment, and if the lithium battery of the vehicle is squeezed in case of a traffic accident, the result is likely to be a fire or explosion, causing secondary damage, or even Will become the culprit to harm the members of the car.

Second, performance and cost.

Generally speaking, the performance of lithium batteries is more outstanding, why is its performance discussed here? Things are far from that simple. Let's do a simple calculation.

The discharge efficiency of lithium batteries at low temperatures is relatively low, so if you want to start the vehicle, you need a special lithium battery with a high-rate formula to cope with this occasion, because the car needs to be discharged with a current of more than 100Ah when starting, so the battery At least 5C (5 rate discharge) can be satisfied. For this, high-rate lead-acid batteries can be achieved at a lower cost. Although lithium batteries can also meet such performance requirements, the cost has increased significantly.

In terms of rework, since the current production and application of lithium batteries have only a history of more than 20 years, there is still room for improvement in some designs and processes. Lead-acid batteries have undergone a century of development, and the technology is simple and mature, making them more reliable to use.

Lithium-ion battery (LIB) has become the main energy storage solution in modern social life. Among them, lithium iron phosphate batteries are a perfect replacement for lead-acid batteries, and they are the first choice for grid-connected peak shaving, off-grid energy storage, photovoltaic energy storage, UPS, data center and other industries.