The southern region decisively chooses lithium iron phosphate for better safety, even if the winter temperature is not low, it has less impact on battery life.
Choosing ternary batteries in northern regions theoretically results in longer driving range for vehicles equipped with ternary batteries, which can compensate for the losses caused by low temperatures in winter. At the same time, the relatively low temperatures in northern regions can also ensure safety.
From the charging habit, lithium iron phosphate can be freely charged, suitable for obsessive-compulsive disorder. It can be charged with a gun every day and is fully charged at the beginning. Highly recommended!!
Three yuan batteries can also be fully charged, but it is not recommended to store them on high power for a long time because the higher the voltage, the faster the internal side reactions of the battery.
There are also drawbacks to lithium iron phosphate batteries. Firstly, the early decay rate is relatively fast (around 40000 kilometers in the early stage), and then the decay rate will be much lower than that of ternary batteries. Car owners need to be mentally prepared for this. For example, if you and your friends buy a car at the same time, after two years, you will find that your lithium iron phosphate decays more than your friend's ternary battery.
Secondly, let me explain the topic of battery safety:
A car battery is composed of hundreds to thousands of small cells, each of which is a chemical pool with energy. The positive and negative electrodes inside are only separated by a thin layer of insulating material (isolation film). When certain extreme situations occur, the diaphragm no longer functions, and the positive and negative electrodes directly overlap, which is equivalent to a short circuit in the wires at home. At this point, a large amount of heat is generated, which accumulates in a short period of time and heats up, igniting the internal liquid (electrolyte: generally flammable). This stage is called cell thermal runaway. (The heat exceeds the range that the battery cell can withstand and cannot be controlled)
One transmission, two transmissions, and four transmissions may gradually ignite the entire battery (or it is possible that only one may experience thermal runaway, and the released heat is not enough to ignite other cells)
Based on the above, as of now in the industry, a solution to the safety of new energy vehicle batteries has emerged.
Firstly, starting from the chemical system, the probability of igniting the battery cell can be reduced by using electrolytes that are more difficult to burn or materials that naturally isolate the positive and negative electrodes (such as solid-state batteries). Compared to ternary batteries, lithium iron phosphate batteries can also be considered to have improved safety in terms of material system. But this can only be considered optimization, with a difference of about 80 points to 85 points, which cannot truly solve the problem of battery fire completely. Because the heat that a battery cell can withstand is always limited, and as the range of an electric vehicle increases, the battery size becomes larger, and the energy density increases, the amount of heat that can be released in case of special circumstances will gradually increase. Once it becomes too large to easily exceed the capacity of both, those gaps are basically useless. The conclusion of this step is that there is no non combustible battery, just as you cannot pray that gasoline in a gasoline car is non combustible.
What other tricks are there?
The second solution is to optimize the system structure by increasing the structural strength of the battery pack to resist external abnormal intrusion. Through innovative internal technology, isolation strips are designed between battery cells, and each cell has its own independent safety compartment to control the heat conduction path. Even if a certain cell experiences thermal runaway under specific circumstances, it can ensure effective export or isolation, preventing ignition of other cells and ensuring safety. The representative technologies in this regard are Sonec battery technology and non thermal diffusion technology, which are very important for high-capacity and high-voltage batteries. (Because the more electricity there is, the weaker the optimization effect of the monomer chemical system will be)
Many friends are concerned about how to charge electric vehicles. What is the difference between using fast charging and slow charging? Will fast charging harm the battery?
Let me provide a unified answer here:
1. Regardless of the type of battery (lithium iron phosphate or ternary), the narrower the power consumption window, the more beneficial it is for its lifespan. For example, using the 30% -80% power range for a long time will definitely have a longer lifespan than using it for a long time with full charge and power consumption below 10%. How much is the difference? For example, if the car is fully charged for a long time, it may experience a 10% decay in 5 years, while the window of 30-80 may only be around 6%. However, if the car is not fully charged for a long time, it may cause problems in calculating the battery level. In extreme cases, the performance may differ greatly from the actual situation, and it may show that there is still 30 kilometers of battery left, causing the car to collapse with just one press of the accelerator. Everyone should understand for themselves.
2. DC fast charging has a significant impact on battery life compared to slow charging, mainly due to two aspects. One is that fast charging, as we all know, will cause temperature rise, increase the degree of internal side reactions, and increase lithium ion loss. The difference in this regard is due to the complex design of the battery itself, such as material formula, additives, etc. (this reflects the ability of battery companies. Even the difference between ternary lithium batteries is significant, not just ternary lithium and lithium iron phosphate)
Another possibility is that it may have an impact on battery health: easily overlooked: DC fast charging is directly connected to the battery itself by charging stations, and abnormal currents generated by some low-quality stations directly harm the battery itself, without filtering in the middle. The battery can withstand the same amount of electricity as the charging station provides.
