What are the factors limit the battery speed?

Source: 2020 - 03 - 28 name hits: what are the factors limit the battery speed? The opening of the new energy automotive industry also affects the power battery market demand. So what is the factors restricting battery charging speed? In addition to the bottleneck of the battery itself, what other factors? The following is the author of the content of the power battery, hope to let us have the harvest! In the current mainstream of lithium batteries, for example, although many varieties, but generally does not include the data structure of anode and cathode materials, alienation, electrolyte, etc. , in the process of charging, mainly from lithium ion cathode, through the gap and the electrolyte, arrived at the speed of the aggressive easing natural loose process becomes the key to recharge rate. What limits the battery charge speed? When evaluating the charging speed, battery life is certainly one of the most inevitable factors. No matter how peripheral charging equipment, how much power, charging talent how strong, assuming that the battery itself has a short board, charging people can bear, so charging speed will not improve. Coupled with the battery capacity is large, natural long charging time. If you studied the electrochemical knowledge, you will understand the battery charge and discharge process. In essence, the battery will be through a series of REDOX reaction, complete the electronic beam transmission between positive and negative electrodes. In the current mainstream of lithium batteries, for example, although many varieties, but generally does not include the data structure of anode and cathode materials, alienation, electrolyte, etc. , in the process of charging, mainly from lithium ion cathode, through the gap and the electrolyte, arrived at the speed of the aggressive easing natural loose process becomes the key to recharge rate. Can be improved by increasing the current theoretically, charging speed. However, if the current is too large, the speed of the lithium ion battery loose cannot keep up with the speed of electronic loose, this will lead to the separation of electron ion transport, affect the function of the battery, charging capacity can be correspondingly reduced, the battery life can't bear to see more, even at the risk of fire and explosion. So in general, in the case of don't try so hard, we suggest that the slow charge as far as possible, to extend battery life. Lithium ion loose speed is closely related to the temperature, the positive data and structure. First is temperature, in general, the higher the temperature, loose nature is the faster the speed, but if the temperature is too high, is to cause a decline in battery life, charging problem such as security compromises. If the temperature is too low, also not good, the temperature is too low, the metal lithium batteries will deposit, so as to form a short circuit in the battery, especially lithium iron phosphate batteries. In general, the lithium iron phosphate battery capacity at 0 ℃ to 60 ~ 70%, only to - At 20 ℃ for unfortunately only 20 ~ 40%. Therefore, in the cold northern winter, the electric car is necessary to heat the battery module, thus faster consumption power. The second is the data of different data loose talent gap is very big, such as cobalt acid lithium manganese acid lithium, lithium iron phosphate, nonconforming product, very good NCA positive data function, and is the better the current function, using a wide range of high two types of data. This is also the lithium battery to the positive data naming one of the important reasons. In the battery industry, charging speed and is usually used to charge and discharge ratios describe the size of the current relationship. Batteries, for example, the rate of 1 hour called 1 c, the rate of only 30 minutes called 2 c, and so on. At present, lithium ion battery charging rate can be widely implemented in 1 c ~ 3 c, the biggest can reach about 5 c, but compared with 10 c discharge rate still has great gap. In addition to the bottleneck of maximum charging rate, cell under different charged state are charging rate is also different. Generally speaking, in the process of charging battery characteristics similar to above, charging speed will be slow Fast - Slower pace. In general, when charged state of 90% or more, the battery internal resistance increases obviously, slow to charge.