How to judge the life length of ternary polymer lithium battery?

Ternary polymer lithium battery refers to a lithium battery that uses lithium nickel cobalt manganate (Li (NiCoMn) O2) as the cathode material. The precursor product of the ternary composite cathode material is nickel salt, cobalt salt, and manganese salt. As raw materials, the ratio of nickel, cobalt and manganese inside can be adjusted according to actual needs. Ternary lithium batteries have greater energy density, but their safety is often questioned.

The reason for this is that even though these two materials will decompose when they reach a certain temperature, the ternary lithium material will decompose at a lower 200 degrees, while the lithium iron phosphate material is about 800 degrees. And the chemical reaction of the ternary lithium material is more intense, it will release oxygen molecules, the electrolyte will burn rapidly under the action of high temperature, and a chain reaction will occur. To put it simply, ternary lithium materials are more likely to catch fire than lithium iron phosphate materials. However, it should be noted that we are talking about materials, not batteries that have become finished products.

Because of the potential safety hazards of ternary lithium materials, manufacturers are also working hard to prevent accidents. According to the easy pyrolysis characteristics of ternary lithium materials, manufacturers will do a lot of overcharge protection (OVP), over discharge protection (UVP), over temperature protection (OTP), and over current protection (OCP). effort. Therefore, the spontaneous combustion incident should consider whether the manufacturer's functions in these links are in place, rather than simply giving up food due to choking.

So what is the current usage of these two batteries? Let's focus on a set of data. In November last year, the installed capacity of electric buses with lithium iron phosphate batteries accounted for 64.9%, and the installed capacity of ternary lithium batteries was only 27.6%. On the contrary, in the pure electric passenger car market, the installed capacity of ternary lithium batteries in November last year exceeded 76%.

It can be seen that the greater energy density of the ternary lithium battery itself should be born as a new energy storage device for automobiles in the future. Now that related safety incidents have occurred, it can be regarded as a good thing when the popularization of new energy vehicles is still in its infancy. In order to achieve the dual goals of seizing the market and obtaining policy support, many new energy vehicle-related companies have relaxed their technical requirements and mass-produced energy components that cannot withstand repeated use for a long time. The working environment of automobiles is harsh, and the causes of safety accidents will inevitably increase greatly when these parts are used for a long time.

Therefore, we can think that Zhang Xiangmu, director of the Equipment Department of the Ministry of Industry and Information Technology, announced at the China Electric Vehicle Hundreds Conference that the safety performance of ternary lithium battery buses is to be evaluated. This is the intention of the relevant state departments to define a standard from the policy level. To promote the production of industry standards. Whether it is for consumers or manufacturers, it will have a very positive significance in the future. Therefore, there is no need to hesitate just because of the one-sided news about safety accidents of ternary lithium batteries on the Internet. The materials are dangerous. The key lies in how to control them firmly.

For pure electric vehicles, most people still love and hate them. More consumers want to buy them but dare not buy them. After all, there are still many points that need to be solved for pure electric vehicles. The core component of a new energy pure electric vehicle is the battery. Nowadays, after buying a car, most car owners are worried about the battery life being too long unless some vehicles have a lifetime warranty. After all, changing a battery can be said to be valuable. So pure electric vehicle battery is the key, what can be done to extend battery life as much as possible? To be honest, if you want to extend the battery life as much as possible, you should pay attention to the following things. Although it is a bit clichéd, I still hope it will be helpful to everyone, especially for some friends who have just bought a car. Pay attention to the maintenance of pure electric vehicles from the beginning. Let your car last longer than others.

The first is to pay attention to the problem of battery attenuation. Under international standards, the service life of a pure electric vehicle battery is not determined by time, but by the number of cycles. After a complete discharge of one cycle, we must understand the so-called complete discharge, and the lithium element is inevitably caused by irreversible electrochemical reactions during the battery reaction process, which causes the capacity to decrease, which is called battery attenuation, general attenuation A degree of 70% to 80% can be regarded as the end of the life of a battery, at least for pure electric vehicles, the impact is somewhat large. If you want to use your battery longer, you must remember not to charge the car in extreme environments, that is, you must not charge the battery in an environment that is too hot or too cold. This will speed up or reduce the reaction to the chemical substances inside the battery. Speed ​​is the most harmful to the battery.

The second is not to keep the battery in a state of power loss for a long time, because as the mainstream ternary lithium battery in the current electric vehicle market, the battery needs to keep the electronics in a flowing state for a long time, only in this way can it achieve the most ideal service life, so If the battery of an electric vehicle is in a state of depletion for a long time, it will have a great impact on the life of the battery. In fact, most car owners will not let the battery be in a state of loss for a long time, but for some friends who have 2 cars at home, this needs to be paid attention to. If you do not turn on for a long time, you must check whether the battery is There is electricity. In addition, in the winter in the Northeast, car owners also need to pay attention, because the car is easy to "freeze" and run out of electricity, and it is still necessary to charge it when it is time to charge.

The last thing to say is not to charge and discharge deeply, that is to say, don't keep the battery charged too full or use it until all the battery is exhausted to recharge. If the result of this is to cause irreversible damage to the positive and negative structure of the battery, the number of cycles of the battery is greatly reduced, thereby reducing the life of the battery. If you want to make the battery of your car use longer, you must change your driving habits. Try to drive at a constant speed, so that the battery discharge speed can be stabilized, so that the battery can achieve a stable internal cycle. It is better to use the battery of a new energy electric vehicle. Stable operation. Some people may think that the maintenance of pure electric vehicles is so troublesome. To be honest, even traditional fuel vehicles actually need your care, so don't feel troublesome. At least this approach will make your car battery last longer.