Power lithium ion battery performance evaluation indicators have?

Source: 2020 - 03 - 28 blessed hits: time dynamic lithium ion battery performance evaluation indexes were in dynamic lithium battery system, each parameter can represent different functions of the system. Lithium-ion batteries, lithium-ion battery monomer by the positive and negative, of electrodes, electrolyte and clearance, is the basic structural unit battery module and batteries. Battery as a kind of electrochemical power source with voltage, internal resistance, capacity, characteristic parameters, such as energy and power. Monomer voltage depends mainly on the positive and negative electrode voltage data type. General cobalt acid lithium, can achieve 4 ternary anode and graphite anode. All about 2 v charging voltage, and lithium iron phosphate can reach 3. 6v。 Internal resistance inside the lithium batteries, lithium ion very moving from one to another, prevented their mobile elements constitute the internal resistance. Described in the first part described including physical resistance of conductive parts; Motor data, such as gap and the electrolyte electrochemical materials inherent impedance; Resistance of lithium ion movement is caused by temporarily increase of electric current from a battery; This three parts constitute the main body of the internal resistance. Power lithium battery capacity refers to the maximum and minimum voltage in the battery and reasonable range can be the biggest battery charging and discharging, is a capacity can be measured. Before mount car, can be measured by charging and discharging unit volume. Once on the plane, battery capacity only through algorithm to estimate. Power to the power here, precisely, is a single battery charge and discharge power, or perhaps the battery charge and discharge power unit mass or volume. At the end of the planning, to determine whether the lithium battery charge and discharge can be used for high power. Specific volume, than can volume is divided by the volume of a cell volume, mass than is divided by the volume. From here, and the battery to the unit capacity cost, from the point of view is the battery charge and discharge to talk about the price: the battery unit capacity cost accounting method performance ability than price, that is to say, the unit price of batteries can be released. However, this approach usually rarely used. Lithium ion battery module battery module consists of many parallel of batteries. In practice, the battery module rarely annotated as a single theme, sometimes in some systems detect them voltage value. Lithium ion battery systems usually composed of modules in series battery pack. In addition to all the parameters of the battery pack, battery pack, the total voltage determines the voltage of the electric vehicle power system path, this is a very important parameter. Battery pack as a whole, there are several safety standards, will continue to monitor. Battery output is the cathode of leakage current, high pressure resistance, system interlocking signal, maximum and minimum temperature, maximum temperature difference, the highest temperature rise rate, maximum and minimum unit of voltage and so on. Above is from the electricity function, as a whole structure, there are many parameters need to continue to pay attention to the battery pack, have the function of environmental tolerance, misuse of tolerance features, not list here.