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Another purpose of capacity division is to classify and group batteries, which is to select and combine monomers with the same internal resistance and capacity. When combined, only those with similar performance can form a battery pack. For example, in order to meet the energy needs of electric vehicles, a power battery pack often requires dozens to thousands of batteries. Due to the complexity of the system, the behavior of the battery pack has its uniqueness, and it is not just a simple addition and subtraction of individual batteries that can obtain the performance of the battery pack. Taking the commonly used series and parallel battery packs as an example, ideally, the individual batteries in all battery packs should be completely consistent. However, in reality, even individual batteries produced in the same batch still have performance differences (including capacity, internal resistance, and other factors). Although screening is carried out before assembling the battery pack, it is still impossible to guarantee 100% consistency in the performance of all batteries. In addition, due to the influence of the battery pack volume, there are also many differences in the heat dissipation characteristics of different parts. Therefore, there is also a large temperature gradient in the temperature distribution of the battery pack. The above factors can cause the degradation rate of the batteries in the battery pack to be inconsistent during use. In this case, on the one hand, it will cause a decrease in the available capacity of the battery pack (limited by the minimum capacity of the series connected batteries in the battery pack). On the other hand, it may also lead to a decrease in the safety of the battery pack. Research has shown that even if the cycle life of a single battery can reach over 1000 times, without the protection of balancing equipment, the cycle life of the battery pack may be less than 200 times. Therefore, for a battery pack, the consistency of the single battery is a very important parameter.

Requirements for the formation and separation accuracy of five lithium batteries

In order to improve the electrochemical performance of batteries, such as cycle life, stability, self discharge, and safety, it is necessary to strictly control the consistency of lithium batteries or accurately evaluate the battery level. Therefore, there is a high requirement for the measurement accuracy of current and voltage of chemical and capacitive equipment. Due to the limitation of sensor acquisition accuracy, the current and voltage measurement accuracy of chemical and capacitive equipment on the market is generally around one thousandth. For chemical synthesis, the higher the control accuracy of current and voltage, the better the quality of lithium battery products. A current and voltage sensor with an accuracy of over one thousandth is an ideal choice. Galaxy Electric has current and voltage sensors with accuracy better than one in ten thousand, providing multiple options.

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