Analyze the capacity uncertainty factors during the use of the battery

Analyzed the uncertain factors of the battery capacity. The use of the battery, like driving a car using fuel, it is impossible to do the car on the road every day, the distance, speed, load, etc. are the same, it is impossible to be at the intersection every day, etc. The time of the red light is also the same, so the number of fuel-consuming cars is different from day to day. The use of the battery is very similar, because the use of the battery, the uncertain factors encountered in daily use, not only the prediction before use, if it is difficult to measure the battery capacity mentioned above, it is not difficult to think that the process of use cannot be accurately understood. Therefore, it is impossible to know exactly how much capacity is left after the battery is discharged. Generally speaking, the actual use of the battery is different from laboratory experiments, and conditions such as ambient temperature and load have strict regulations. In the case of great changes in the use environment, unstable batteries in general chemical products are no exception, which will inevitably lead to uncertain changes in battery parameters, including capacity parameters, within a certain range. Not only that, it is also related to the problem of battery storage systems, which is different from the way fuel cars store energy. The fuel loss from the fuel tank to the engine combustion chamber is negligible. So it is easy to know how much oil is left in the tank. On the other hand, the battery supplies current output for the work load, and the energy loss of the battery's internal resistance and contact resistance cannot be ignored. Moreover, the size of this loss is directly proportional to the size of the battery output energy and the size of the time. It also radiates to the surrounding space in the form of heat. Under normal circumstances, this divergence loss is related to the temperature, air flow rate and cooling conditions around the battery, and it is difficult to accurately measure. Objectively speaking, it is also worth noting that the battery energy storage mode is fundamentally different from the general type of automobile energy storage mode. Once the fuel tank becomes a product, the volume of the stored fuel material will not change with changes in the environment, unless an accident occurs. The battery is different. Although the appearance of the product structure does not seem to change greatly with the environment, the size and capacity of the stored electrical energy change with the change of the environment. This is also one of the complex problems that the battery energy storage system is difficult to control. Therefore, there is also a great uncertainty about the capacity of the battery after each use. This objective fact strongly answers the fact that the load Cr value measured in the previous SOC measurement equation cannot represent the actual capacity consumption value of the battery in daily use. On the other hand, it gives an objective and reasonable answer to the question of lack of scientific basis for SOC measurement. The capacity of the battery is not a single value, and its size meets the measurement conditions. Even in the laboratory, the same full battery is discharged with different currents of 2C and 0.5c, and the capacity is very different. This is common knowledge. In the actual use of batteries, the actual load is a wide range of loads. For example, there are great uncertainties in electric transportation products. Disclaimer: Some pictures and content of articles published on this site are from the Internet, please contact to delete if there is any infringement. Previous: Lithium-ion battery assembly process and technology