Capacitive principle and function of lithium battery
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2022/05/18 09:27:01
Lithium battery capacity: simple understanding is capacity sorting, performance screening and grading. The capacity of the battery is determined by charging and discharging the battery and detecting the discharge capacity when the capacity is fully charged. So how to divide the capacity of lithium battery, what are the methods of the capacity? Please read on.
What is lithium battery capacity?
The first explanation: lithium battery capacity: simple understanding is capacity sorting, performance screening classification. Lithium battery capacity through computer management to get the data of each detection point, so as to analyze the size of the battery capacity and internal resistance and other data, determine the quality grade of lithium battery, this process is capacity. After the first separation of lithium battery capacity, need to stand for a period of time, generally not less than 15 days, during this period, some inherent quality problems will be shown.
The second explanation: after a batch of lithium batteries are made, although the size is the same, the capacity of the batteries will be different. Therefore, the device must be fully charged according to the specification, and then discharged according to the specification current (discharge). The time it takes to discharge the battery times the discharge current is the capacity of the battery. A lithium battery is qualified only if the tested capacity meets or exceeds the designed capacity, while a battery less than the designed capacity is not qualified. This process of screening qualified batteries through capacity tests is called capacity splitting.
Lithium battery formation: generally refers to the first charge of the battery to implement a series of technological measures to make the performance tends to be stable, including small current charge and discharge, constant temperature and static.
Lithium battery capacity principle:
The capacity of lithium battery is by the composition of the capacity cabinet (due to the same basic principle of formation and capacity, formation and capacity function integrated in the same cabinet, known as the composition of capacity cabinet) to complete, into the capacity cabinet function is actually like a charger, but it can charge and discharge a large number of batteries at the same time.
Lithium battery capacity through computer management to get the data of each detection point, so as to analyze the size of the battery capacity and internal resistance and other data, determine the quality of the battery grade, this process is capacity.
What is the role of lithium battery capacity?
Production of lithium batteries are not immediately sell, should be put in storage save at least 15 days, in the meantime, some inherent disadvantages were shown, for example self-discharge is too big, and so on, in the garage reach the shelf life of batteries, after get the order, then take out again detection capacity, again to say again to charge and discharge, the capacity can not meet the level, Or quality problems are eliminated, and then to maintain about 50% of the power to the sales department, and finally to the mobile phone battery assembly factory hands.
The cell will be used for lithium battery assembly into machine capacity again, through this process, can always pick out some do not meet the requirements of the cell, and the cell factory return. After the mechanical test of lithium battery detection, it can be seen that the battery is charged and discharged, and it is "electric". So when you get the battery, you have two bars, which is normal.
Battery capacity Each channel can be a single point of start, a single point of stop, fast response. Each channel has an independent constant current source, constant voltage source, real-time current and voltage sampling, constant flow and constant voltage truly no disturbance continuous switching. Can be used for cycle life test.
To classify and organize lithium batteries is to select monomers with the same internal resistance and capacity for combination. When combined, only those with similar performance can form a lithium battery pack. For example, in order to meet the energy demand of electric vehicles, the power battery pack often needs to be composed of dozens to thousands of batteries. Affected by the complexity of the system, the behavior of the battery pack has its own uniqueness, and the performance of the lithium battery pack can not be obtained by a simple addition and subtraction of a single battery.
Precision requirements of formation and capacitance separation of lithium batteries:
In order to improve the cycle life, stability, self-discharge, safety and other electrochemical performance of lithium battery, it is necessary to strictly control the consistency of lithium battery or accurately assess the battery grade, so the measurement accuracy of current and voltage of formation and capacitive equipment has high requirements, limited to the sensor acquisition accuracy, At present, the measurement accuracy of current and voltage of chemical component capacity equipment on the market is generally about 1/1000. For Formation, the higher the control accuracy of current and voltage, the better the quality of lithium battery products will be. The accuracy of current and voltage sensor is more than 1/10,000 is the ideal choice.
The battery has been checked before leaving the factory, and the cabinet in the lithium battery factory is divided into capacity. Lithium batteries are widely used in electronic products due to their excellent performance such as high energy density, high voltage, high cycle, high safety and environmental protection. Therefore, it is very important to ensure the consistency and reliability of lithium battery products.
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