Method for detecting capacity of lithium ion batteries

　　Author ：Iflowpower – Portable Power Station Supplier

At present, the more applications in the battery market and lithium batteries are also broad. The lithium battery has a high density and is 5 times the lead-acid battery. At the same time, the life of the lithium battery is also greatly increased, and the number of lithium battery charge and discharge is 1000 times.

It can be used in theory for ten years, and lead-acid batteries can only use 3 years, so that from future costs A lot. The self-discharge of the lithium battery is still very low, no memory effect. * An important one is that lithium batteries have no pollution, in line with my country's promotion standards.

I believe many people have used lithium batteries, then we determine its capacity when buying lithium batteries? Generally, conventional charging is "two-stage constant current charging", this method is neither a waste of electric power, short charging time, is advantageous for extending lithium battery life, while calculating lithium battery capacity is much easier. The situation of wind power is different from conventional charging. Whether the lithium battery capacity is configured reasonable, directly affecting the technical economic indicators of wind power generation.

The capacity is small, the deposited power from the wind is not fully stored. The capacity is too large, one increases the investment; two lithium batteries may be in a state of charge, which will affect the efficiency and service life of lithium batteries. Table 1 is the investment situation of lithium batteries in wind power equipment.

1. Experience calculation method According to our pilot, the following formula can be used to easily estimate the required battery capacity in the case of the situation. That is: Q - the required lithium battery capacity (safe); P-load power (watt); T - daily electricity hour; U-- Standard lithium battery voltage (typically 12 volts); N - battery reserve cycle coefficient; (determined according to the wind conditions, generally take 3 ~ 8 days) K - discharge control coefficient, (take 0.

75 ~ 0.8) above consideration: 1 Rated power of electric equipment, 2 local Meteorological conditions, no wind average time, 8 In order to prevent lithium battery over discharge, discharge should be controlled to a certain extent. For example, install a 100 tile machine for 3 homologous electricity, and each household is installed for 12 volts 15, which is only 5 hours a day, calculating the lithium battery capacity required for the required configuration.

(Take a reserve system 6, discharge control coefficient 1 0.8) After entering the formula: 6 blocks of L2 volts 48 security lithium battery, total capacity 288 security. 2.

Electrical balance calculation. The calculation steps are as follows: a. According to the wind speed information provided by the local meteorological department, the three-day statistical fan starting working wind speed to different wind speeds in the range of different wind speeds.

b. According to the P = F (V) characteristic curve and wind speed data of the selected wind turbine, calculate the amount of electricity that can be issued by the setup, and draws its annual power generation process curve. The annual power generation process line of the Shangshu Chairman ED1.

5 ~ 100 wind turbine according to the wind speed data. The calculation is found in the local air condition, and the annual power generation is 276 degrees. From the process line, it seems that the power generation changes is large, * more than 19 degrees in the four months, * less only 0.

95 degrees in late February, the difference is 20 times, indicating that the lithium battery is necessary to carry out energy storage adjustment is necessary. C calculates the electricity amount of electricity in accordance with the electricity signal, and gives the full-year electricity supply line. Diabed in the drawing.

d. Compare power generation and electricity processing lines, determine the required lithium battery capacity by less than the power generation of power generation than the electricity difference *. Difference * is 2.

3 degrees. You need to configure 2300 volt-time battery, actually use 12 volts 48 security lithium battery 4 blocks. Total capacity 2304 volts.

When determining a standard battery, you must note that the capacity of the reservoir should be able to secure the * current intensity IMAX output from the wind turbine. Since the wind speed changes frequently, the current output is small, sometimes no, such a lithium battery charging It is difficult to determine the current and the required charging time. In response to this actual situation, we use the following two calculations to determine the configuration of lithium battery capacity.