The ternary polymer lithium battery refers to a lithium battery using a nickel-cobalt-manganate (Li(NiCoMn)O2) ternary positive electrode material for the positive electrode material, and a ternary lithium ion battery composite positive electrode material precursor product, which is a nickel salt or a cobalt salt. The manganese salt is used as the raw material, and the ratio of nickel-cobalt-manganese can be adjusted according to actual needs. Ternary lithium batteries have higher energy density, but safety is often suspect.
The reason for this is that even if both materials decompose when they reach a certain temperature, the ternary lithium material will decompose at a lower temperature of about 200 degrees, and the lithium iron phosphate material is around 800 degrees. Moreover, the chemical reaction of the ternary lithium material is more intense, and oxygen molecules are released, and the electrolyte rapidly burns under the action of high temperature, and a chain reaction occurs. To put it simply, the ternary lithium material is more likely to catch fire than the lithium iron phosphate material. However, it should be noted that we are referring to materials, not batteries that have become finished products.
Because ternary lithium-ion battery materials have such safety hazards, manufacturers are also trying to stop the direction of accidents. According to the easy pyrolysis characteristics of ternary lithium materials, lithium manganate lithium ion battery manufacturers in overcharge protection (OVP), over-discharge protection (UVP), over-temperature protection (OTP), over-current protection (OCP) There will be a lot of effort on the top. Therefore, the spontaneous combustion incident should be more about whether the function of the manufacturers in these links is in place, rather than simply squandering food.
So what is the current use of these two batteries? Let's focus on a set of data. In November last year, the installed capacity of electric bus for lithium iron phosphate battery accounted for 64.9%, and the installed capacity for ternary lithium battery was only 27.6%. In contrast, in the pure electric passenger vehicle market, the installed capacity of the ternary lithium battery in November last year exceeded 76%.
It can be seen that the advantage of the greater energy density of the ternary lithium-ion battery itself should be born as a new energy storage device for the future. Now that the relevant security incidents occur, it is a good thing when the popularity 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 enterprises have relaxed technical requirements and mass-produced energy components that cannot withstand repeated use for a long time. The environment in which a car works is harsh. When these parts are used for a long time, the cause of a safety accident is inevitably greatly increased.
Therefore, we can think that Zhang Xiangmu, director of the equipment department of the Ministry of Industry and Information Technology of the Lithium Manganate Lithium Ion Battery China Electric Vehicle, announced that it is necessary to evaluate the safety performance of the ternary lithium battery bus. A standard definition is made to promote the generation of industry standards. Whether it is for consumers or manufacturers, it has a very positive meaning in the future. Therefore, there is no need to see the safety accident news of the ternary lithium battery on the Internet one-sidedly, the materials are dangerous, the key is how to firmly control.
Batteries for different types of new energy vehicles: uniform requirements
After talking about the battery, I believe that for the new energy vehicle of lithium iron phosphate lithium ion battery, we need to briefly introduce the role of lithium iron phosphate lithium ion battery in the vehicle. After all, consumers who buy pure electric vehicles still account for a small number, and more friends are concerned about hybrid vehicles. Hybrid vehicles can be divided into three types: ordinary hybrid vehicles, plug-in hybrid vehicles and extended-range hybrid vehicles.
In the above three types of cars, the arrangement of the battery capacity from small to large is just an ordinary hybrid vehicle < plug-in hybrid vehicle ≤ extended-range hybrid vehicle. The batteries of ordinary hybrid vehicles are not rechargeable, the batteries are used for starting and rapid acceleration; the batteries of plug-in hybrid vehicles are increased in capacity and rechargeable on the basis of ordinary hybrid vehicle batteries, with better acceleration and fuel economy. Capability; while the engine of the extended-mix hybrid car is used to drive the motor to generate electricity, and is more inclined to pure electric vehicles.
These three hybrid vehicle models have their own advantages and disadvantages. At this stage, the main force is also based on ordinary hybrid power and plug-in hybrid power. Because the characteristics of the three hybrid vehicles have something in common for battery life and working environment, consumers should pay attention to relevant parameters, such as battery material and environment, regardless of the model of hybrid vehicle. And the best working conditions, etc. At the same time, manufacturers should strictly control battery quality and related security settings during the design process to ensure safe and efficient use.
The key to the development of new energy vehicles is whether their experience can rival or even surpass the traditional internal combustion engine vehicles, and whether there is a better advantage in the purchase and after-sales links. In my opinion, the key to the development of new energy vehicles is also the key to the development of mobile digital products - the development of batteries. How to ensure that battery technology can meet the growing needs of consumers in a safe situation is not only the automotive industry-related industry personnel, but also the pursuit of scientific research workers in the whole field.