What is a power lithium battery? The difference with capacity lithium battery is

Power needs to consider more reliability and consistency. After all, it will take a long time (at least 5-10 years), harsh environments (low temperature in winter, exposure to the sun, rain and snow), and a large number of battery series and parallel groups. Considering reliability and consistency, suppose a car uses 1,000. Ideally, car manufacturers hope that there will be no problems with a model of 100,000 vehicles, that is, ideally, problems with power batteries (safety, storage, circulation, etc.) ) The probability is less than one in 100 million (of course, for the highest-end consumer batteries, Apple also requires suppliers to this level). Considering reliability, power batteries are generally designed with more redundancy, using thicker diaphragms, foils and casings, so the energy density is about half of that of consumer batteries. Consumer lithium-ion batteries do not need long-term reliability (the cycle does not need to be too good, because they will be replaced in one or two years anyway), and generally do not need to be used separately, so there is not much requirement for consistency, but because of consumer The space of mobile phones and pads is limited and very precious. Therefore, consumer lithium-ion batteries have strict requirements on size, capacity, and energy density. For safety, power batteries have more external protection circuits, heat dissipation layouts, etc., of course, they also face more severe conditions (higher external voltage, greater current, more complex external environment), and consumer battery protection Less, relying on the material and design of the battery on the basis of higher energy density to withstand various safety-critical situations.　　 There are many types of lithium batteries, such as power-type lithium batteries and capacity-type lithium batteries. So what is the difference between these two types of lithium batteries? Many people may not be very clear, the following author will explain it for everyone. 1. The voltage is different. In the battery industry, the voltage increases, and the corresponding output voltage will also increase, so that the power type can meet some high-power equipment; and the direct effect of the parallel mode is to make the entire battery pack The current increases, and the capacity is affected by the current at the output, so the direct effect of parallel connection is to increase the capacity of the lithium battery pack. The capacity of the battery pack connected in this way tends to be relatively large, which is the so-called capacity Type lithium battery pack.　　2, the applied products are different. 　　 Some large-scale equipment requires a higher voltage value, because the low-power battery pack can not run, so it is necessary to choose the power-type lithium battery pack. For example, for the electric bicycles we usually use, the voltage value it requires is often 48V. Compared with some situations in our lives, 48V is not small. Therefore, power-type lithium battery packs must be used to ensure the operation of electric bicycles. However, we usually go to some large supermarkets or shopping malls, some sign lights and backup power supplies. Because these devices do not consume much power, they generally use capacity-type lithium battery packs. The application of the products is different between the two. of. 3. The internal resistance of lithium batteries with different internal resistances is smaller than that of capacity lithium batteries. Taking 18650 as an example, manufacturers with good 3 rate discharge generally have PDC with an internal resistance of about 40; 5 times discharge is generally not With PDC internal resistance of about 20.　　The lithium batteries used in new energy vehicles are all divided into three types according to their characteristics: power type, energy type and power-energy type. The power type is the main feature of the power lithium battery you are talking about is to support high-rate charge and discharge, which is generally as high as 10C or more. The main parameter to be considered is the specific function (W/kg). The main characteristic of energy type is higher specific energy (Wh/kg). For example, the capacity type is a marathon runner. To have endurance, it means that the capacity is large, and the requirements for high-current discharge performance are generally not high; the power type is a sprinter who fights for bursting power, but also has endurance, otherwise the capacity is too large. You can't run far when you are young.　　 The power-energy lithium battery is accompanied by the emergence of plug-in hybrid vehicles. It requires the battery to store high energy, which can support pure electric driving for a certain distance, but also has good power characteristics, and enters the hybrid mode when the battery is low.　　 Power lithium batteries are power lithium batteries. The main feature is to support high-rate charge and discharge, which can be as high as 10C. The main parameter to be considered is the specific function (W/kg).　　The main characteristic of the capacity type is the specific energy (Wh/kg). For example: 　　 If the capacity type is similar to a marathon runner, endurance is required, that is, high capacity is required, and the high current discharge performance is not high; then the power type is a sprinter, fighting for bursting power, but endurance is also necessary, otherwise capacity It’s too young to run far. The power energy lithium battery is accompanied by the emergence of plug-in hybrid vehicles. It requires the battery to store high energy, which can support pure electric driving for a certain distance, but also has good power characteristics, and enters the hybrid mode when the battery is low.　　 I personally think that high-end consumer batteries use the most advanced technology and materials, while power batteries require more advanced process control, consistency control and quality management.　　1. The capacity is not the same, the power of the general large mobile phones and other electronic products has a small capacity, 　　2. The cycle life power will also be higher 　　3. At the temperature control point, the power will have a protection temperature of the battery pack. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What is the difference between a lead-acid battery and a lithium battery? After the car repairer explained, the owner: the gap is so big