Talk about three car batteries

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

Talk about new energy car batteries

Most vehicle batteries are re-developed based on batteries in daily life, which can be roughly divided into three categories. They are lithium battery, flywheel battery and nickel hydrogen battery. The following small fat and we talk about the characteristics of these three batteries.

I. lithium battery

Talk about new energy car batteries

Sound familiar? Yes, the battery in our phones is its brother. It has not only captured the market of mobile phone batteries, but also successfully occupied half of the market of vehicle batteries. At present, there are mainly two kinds of lithium batteries for electric cars, namely lithium iron phosphate battery and lithium ternary battery, and these two kinds of batteries have significant differences in their own characteristics, so it is necessary for us to explain and compare them in detail.

Why are lithium iron phosphate batteries safe?

Talk about new energy car batteries

Compared with early manganese acid lithium batteries, lithium iron phosphate batteries on energy density did not have too big difference, approximately 100-110 wh/kg, but its thermal stability is currently one of the best car lithium-ion batteries, when the battery temperature at 500-600 ℃ high temperature, its internal chemical composition to decompose, and belong to lithium battery of cobalt acid lithium batteries in 180-250 ℃ when internal chemical composition has been in a state of flux. In other words, the safety of lithium iron phosphate batteries is second to none among lithium batteries, which is why it has become one of the main categories of electric vehicle batteries.

Why did tesla choose ternary lithium battery?

Talk about new energy car batteries

Compared with the lithium iron phosphate battery, the ternary lithium battery is much higher in weight and energy density, about 200Wh/kg, which means the same weight ternary lithium battery has a longer range than the lithium iron phosphate battery. But its shortcomings are obvious, when its temperature is 250-350 ℃, internal chemicals began to decompose, thus puts forward high requirements on battery management system, the installation of insurance device need batteries separately for each section, in addition, due to the monomer volume is small, so the bike to battery monomer quantity is very large, MODELS, for example, more than 7000 section 18650 ternary lithium battery to meet the dosage of the assembly of a car, it has further increased the difficulty of control for the battery management system. Therefore, at present, only tesla USES ternary lithium battery in the models sold in the market.

Two, the flywheel battery

Talk about new energy car batteries

Flywheel battery is a new concept battery which was put forward in 1990s. Simply put, it is to use similar to the principle of energy generated when the flywheel rotation to achieve their own charge and discharge. However, the flywheel battery is only used as auxiliary energy, and its function is similar to that of the braking energy recovery system. Even so, there is reason to believe that flywheel batteries will be a promising future as technology improves and prices fall further.

Nickel metal hydride battery

Talk about new energy car batteries

Nickel-metal hydride battery is another kind of mainstream electric vehicle power battery except lithium battery at present. It developed gradually after the 1990s. For example, many hybrid electric vehicles represented by Toyota prius adopt such battery as energy storage component. Its energy density is not very different from that of ordinary lithium batteries, about 70-100wh /kg. However, since the voltage of a single battery is only 1.2v, which is 1/3 of that of lithium batteries, the volume of its battery pack is larger than that of lithium batteries under a certain demand voltage.

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