Comparison of LiFePO4 battery and lead-acid battery in base station

LiFePO4 batteries and lead-acid batteries are used in base stations, mainly considering that different discharge rates have less influence on the discharge capacity of such batteries, and that they can withstand a wide range of ambient temperatures. The following will analyze the battery capacity selection based on the power consumption and backup time of the base station.

BASE STATIONS CAN BE DIVIDED INTO THE FOLLOWING TWO TYPES:

(1) Macro base station and indoor distributed source station

The power of GSM macro base station can be calculated according to 3.5A / carrier frequency, and it is divided into township (4/4/4) 46A, urban area (12/12/12) 130A, and extremely dense urban area (15/15/15) 160A.

The power of TD macro base station is divided into single-band station (including 1 BBU and 3 RRU) 1200W25A, dual-band station (1 BBU and 6 RRU) 2100W44A, of which 1 BBU300W and 1 RRU300W.

The power of indoor distributed source stations is divided into single-band stations (including 1 BBU and 5 RRU) 1000W21A, dual-band stations (1 BBU and 10 RRU) 1400W29A, and tri-band stations (1 BBU and 15 RRU)

2100W44A, including one BBU600W and one RRUSOW.

The battery backup time for macro base stations and indoor distributed source stations is: 3h in urban areas, 5h in towns, and 7h in mountain areas.

(2) The indoor distributed RRU can include one or more RRUs. A single RRU consumes 80W1.67A of power and requires 4 hours of battery backup time.

According to calculations, the configuration of lead-acid batteries is as follows:

Wireless device configuration

Installation Location

Current

(A)

Time

(h)

Capacity

(Ah)

Voltage

(V)

Lead acid information

12 carrier frequencies(46A)

Town

50

5

423.91

48

500Ah*1 / 200Ah*2

12 carrier frequencies(46A)

Mountain

50

7

554.84

48

300Ah*2

36 carrier frequencies(130A)

Urban area

134

3

796.95

48

500Ah*2

36 carrier frequencies(130A)

Town

134

5

1133.71

48

600Ah*2

45 carrier frequencies(160A)

Urban area

164

3

975.15

48

500Ah*2

TD macro base station or source

Urban area

48

3

286.11

48

150Ah*2

TD macro base station or source

Town

48

5

407.01

48

200Ah*2

RRU*1

Urban area

1.66

5

14.08

48

50Ah*1

RRU*3

Urban area

5

5

42.25

48

50Ah*1

 

Limited by the type of LiFePO4 battery products, the current mature ones are 50Ah, 100Ah, 150Ah,

200Ah. Take 48V / 50A communication load for 5 hours as an example to conduct selection and investment comparison.

The constant current discharge data of LiFePO4 battery is shown in the following table:

LiFePO4 Battery

Constant current discharge    Discharge time(h) and termination voltage(2.6V)

300Ah

Time(h)

11

4.30

1.95

1.05

0.33

Current(A)

30

75

165

300

900

Capacity(Ah)

330

323

321

316

296

Discharge rate

0.10C

0.25C

0.55C

1C

3C

200Ah

Time(h)

12.65

4.94

2.18

1.15

0.33

Current(A)

20

50

110

200

600

 

The use of LiFePO4 batteries in base stations has the following advantages:

  1. Small capacity: The discharge capacity of the LiFePO4 battery is not as obvious as that of the lead-acid battery due to different discharge rates. Therefore, a battery with a smaller capacity can be selected to meet the power demand of the same communication load.
  2. Good high temperature performance: The existing base station air conditioner is set to 28 ° C. If it is raised to 35 ° C, a lead-acid battery needs to be equipped with a separate insulation box. Otherwise, every 10 ° C increase in temperature will reduce the battery life by half. The LiFePO4 battery can withstand high temperatures of 55 ° C, and its life is not affected. The temperature setting value of the base station can be directly increased to achieve energy saving and emission reduction.
  3. Small size and light weight: 3.2V / 200Ah LiFePO4 battery size (length * width * height) 360 * 55 * 250, weight 8.1kg; 3.2V / 300Ah LiFePO4 battery size (length * width * height) 360 * 55 * 306, weight

9.6kg; 2V / 300Ah lead-acid battery size (length * width * height) 124 * 181 * 365, weight 19kg.

One 48V / 200Ah LiFePO4 battery pack and one 48V / 300Ah lead-acid battery pack have the same installation mode. The former covers 59% of the area and the former weighs 28% of the latter. If it is considered that under the same load-bearing conditions of the computer room, the LiFePO4 battery can be installed in a double-layer dual-row, and the lead-acid battery needs to be installed in a single-layer dual-row, the former covers an area of ​​29% of the latter. The same set of 48V / 300Ah LiFePO4 battery and lead-acid battery pack, under the same installation method, the former covers an area of ​​59% of the latter, and the former weighs 34% of the latter.

  1. Long cycle life: The LiFePO4 battery has more cycle life, and is especially suitable for use in four types of mains base stations with repeated power outages.
  2. Investment is flat: the price of a group of 48V / 300Ah lead-acid batteries is about 8640 yuan (collection price: 1.2 yuan)

/2V.Ah), a group of 48V / 200Ah LiFePO4 battery price is about 25600 yuan (market price: 8 yuan

/3.2V.Ah), the price of a group of battery insulation boxes is about 100 million yuan, and the price of a group of LiFePO4 batteries (without insulation boxes) is 1.37 times that of a group of lead-acid batteries (including insulation boxes). When the price of LiFePO4 battery drops to 6 yuan / 3.2V.Ah, the price of a group of LiFePO4 battery (without insulation box) is 19,200 yuan, and the cost of the two is basically the same. In addition, the reduction of the area and weight of the equipment room can reduce the construction cost of the equipment room, the cycle life of the LiFePO4 battery is better, the battery replacement cycle can be extended, and the high-temperature performance can save air-conditioning power.

  1. High resistance to environmental temperature: When the lead-acid battery is used in outdoor stations, it needs to be installed in a thermal insulation cabinet. In areas with particularly harsh climate conditions, it also needs to be buried in the frozen soil layer, which brings great damage to installation and maintenance. inconvenient. The LiFePO4 battery is suitable for high ambient temperature, charging ambient temperature is 0 ° C ~ 55 ° C, and discharge ambient temperature is -20 ° C ~ 60 ° C. It is suitable for outdoor stations without machine rooms, no air conditioning, and ambient temperature above zero.

If you want to know more information, you can click this link.

https://www.ctechibattery.com

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