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Voltage consistency of lithium-ion battery series using what effect?

by:Vglory      2020-12-07
Source: 2020 - 04 - 12 21:06 hits: time consistency of lithium ion battery voltage series use abstract: the influence of the tested 18650 monomer battery in different charge voltage and discharge power flow cycle life. Battery SOC is caused by quantitative differences, inconsistent and battery voltage is due to a single battery self-discharge in series, lead to single battery over discharge cycle and attenuation of the cycle life of battery. Using three electrode system measuring the real battery in the relationship between the positive and negative electric potential in the process of charging and discharging. Lithium ion batteries; Consistency; Excessive charge; Discharge, In the series of lithium ion battery consistency is user demands on batteries. In the field of the combined series, battery inconsistency will affect the performance of the battery, even bring safe hidden trouble. Cause there are many factors that can more series battery using inconsistent, including battery itself, such as the capacity is not consistent, inconsistent self-discharge rate, internal resistance is not consistent, inconsistent life, etc. Have external causes, such as different battery cooling environment, different battery connection between internal resistance and even detection circuit discharge caused by uneven. This paper mainly discusses the voltage impact on many battery inconsistency. Battery voltage inconsistency is common problem in practical applications, the voltage is also the most important monitoring parameter of the battery management system. In practice, the battery voltage is the main reason for the inconsistent uneven capacity and the battery self-discharge, and the battery voltage is not consistent mainly influence the batteries in series. In this paper, the battery of 18650 cylindrical battery power. Excessive charging cycle life test of a battery, with 2 C constant current charging, and the current is less than 0. 5 degrees in different voltage and current at 10 to 2. 5 V C over discharge cycle life test of a battery, use 2 C constant current charging, 4. 2 V constant voltage current is less than 0. 5 C and 1 C, 10 C constant discharge to 1. 0, 2. 5 V。 5 s1p combined cycle life test with 2 c constant current to 21. 0v, 21. Constant pressure to 0 0 v. 5 c, 10 to 12 c discharge. 5v。 During the trial, no single battery overcharge, over discharge protection. Three electrodes of the battery, the reference electrode to use 1 mm diameter nickel wire. Nickel wire surface of the circumference of a circle with lithium metal pieces, metal lithium by grinding on the glass surface, make the fresh metal lithium tightly wrapped in lithium nickel wire as the reference electrode. After 18650 the battery discharge, remove the battery cover with forceps. Then insert the reference electrode pole group of center hole, hole at the center of the electrolyte injection. The hole will advance the PP material, plastic cover, sealed with Parafilm tape. Finally, the humidity is less than 1% of the dry indoor were measured in three electrode system. The test content: 1. 1 under different charging voltage monomer battery cycle life 1. 2 monomer battery over discharge cycle life 1. 3 uniform voltage effect on the cycle life of the battery pack 1. 4 true battery three electrode system this paper measured the 18650 charging and discharging lithium ion batteries are different in different charging voltage and discharge current cycle performance, voltage and initial SOC differences, simulating the battery self-discharge lead to inconsistent series battery voltage, overcharge protection without a part, the battery cycle life, because of the single battery discharge, resulting in failure of the battery pack. Through to the actual battery three electrode system test, the relation between the change of discharge at the end of the negative potential.
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