Talk about three car batteries.

Battery is a very common item in our daily life and provides us with a lot of help. So, are the batteries in vehicles the same as those in our daily lives? Was it designed specifically for vehicles?

Talk about batteries in new energy cars.

Most of the vehicle batteries are products that have been re-developed based on batteries in life and can be roughly divided into three categories. They are lithium batteries, Flywheel batteries, and nickel-metal hydride batteries. The next little fat and you talk about the characteristics of these three batteries.

I. Lithium batteries

Talk about batteries in new energy cars.

Does the lithium battery sound familiar? Yeah, the battery in our phone is its brother. It not only captured the market for mobile phone batteries, but also successfully captured half of the vehicle batteries. Today, the lithium batteries equipped with electric vehicles are mainly lithium iron phosphate batteries and lithium ternary batteries, and there are significant differences in their own characteristics, so it is necessary to make a detailed explanation and comparison.

Why is lithium iron phosphate battery safe?

Talk about batteries in new energy cars.

Compared to the early lithium manganese batteries, lithium iron phosphate batteries do not have much difference in energy density, about 100-110 Wh / kg, but their thermal stability is currently the best in automotive lithium batteries, when the battery temperature At 500-600 °C high temperature, Its internal chemical composition began to decompose, and the lithium cobalt acid battery belonging to the same lithium battery was already in an unstable state at 180-250 °C. In other words, the safety of lithium iron phosphate batteries is second to none in lithium batteries. Because of this, it has also become one of the main categories of electric vehicle batteries.

Why did Tesla choose a three-way lithium battery?

Talk about batteries in new energy cars.

Compared with lithium iron phosphate batteries, lithium ternary batteries have a weight energy density of about 200 Wh / kg, which means that lithium ternary batteries of the same weight have longer range than lithium iron phosphate batteries. longer. However, its disadvantages are also obvious. When the temperature is 250-350 °C, the internal chemical composition begins to decompose. Therefore, the battery management system is extremely demanding and it is necessary to install safety devices for each battery. In addition, due to the small size of the monomer, Therefore, the number of battery monomers required for bicycles is very large. Taking MODELS as an example, more than 7,000 units of 1,8650 ternary lithium batteries can meet the assembly requirements of a car. This undoubtedly further increases the difficulty of control for the battery management system. Therefore, of the models currently on the market, only the Tesla family uses ternary lithium batteries.

II. Flywheel batteries

Talk about batteries in new energy cars.

The flywheel battery is a new concept battery that was proposed in the 1990s and is also a kind of physical battery. Simply put, it uses the principle of generating energy when a flywheel rotates to achieve its own charging and discharging. However, Flywheel batteries are only used for auxiliary energy, and their function is similar to our common braking energy recovery system. Even so, we still have reason to believe that as the technology continues to develop and the price is further reduced, the application of flywheel batteries will be very promising.

III. Nickel-metal hydride batteries

Talk about batteries in new energy cars.

Nickel-metal hydride batteries are another type of mainstream electric vehicle power battery other than lithium batteries. They have gradually developed since the 1990s. Many hybrid vehicles such as the Toyota Prius use these batteries as energy storage components. The energy density is not much different from that of ordinary lithium batteries, about 70-100Wh/kg, but since the battery cell voltage is only 1.2V, which is 1/3 of the lithium battery, when the demand voltage is constant, its The size of the battery pack is larger than that of the lithium battery.

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