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Who is suitable for LiFePO4 batteries and lead-acid batteries in base stations?

2020-10-13


LiFePO4 batteries and lead-acid batteries are used in base stations, mainly taking into account that different discharge rates have less impact on the discharge capacity of such batteries and are resistant to a wide ambient temperature. The following is an analysis of the battery capacity selection for the power consumption and back-up time of the base station.

Base stations can be divided into two types:

(1)   Acer station and indoor distribution source station.

GSM Acer station power can be calculated according to 3.5A / carrier frequency, divided into townships (4/4/4) 46A, urban (12/12/12) 130A, mega-dense urban areas (15/15/15) 160A.

The power of TD Acer 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 BU300W and 1 RRU300W.

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

2100W44A, 1 BU600W, 1 RBUUSOW.

Acer station and indoor distribution of the source station battery backup time: urban 3h, township 5h, mountain 7h.

(2)   Indoor distribution of RRU indoor distribution of RRU, may include 1 or more RRU, a single RRU power consumption of 80W1.67A, battery backup time of 4 hours.

According to the calculation, the configuration of the lead-acid battery 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 product type of lithium phosphate battery, the current mature for 50Ah, 100Ah, 150Ah, 200Ah. Taking 48V/50A communication load operation 5h as an example, the selection and investment comparison is carried out.

The constant current discharge data for LiFePO4 batteries are shown in the table below:

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 at base stations has the following advantages:

1, The capacity is small: LiFePO4 battery discharge capacity by different discharge rate is not as obvious as lead-acid battery, so optional smaller capacity of the battery to meet the same communication load of electricity demand.

2, High temperature performance is good: the existing base station air conditioning is set to 28 , if raised to 35 , the lead-acid battery needs to be separately configured with a heat insulation box, otherwise, the temperature for every 10 , battery life reduced by half. The LiFePO4 battery can withstand high temperature of 55 , life is not affected, the base station temperature setting value can be directly increased, to achieve energy conservation and emission reduction.

3, Small size, light weight: 3.2V/200Ah LiFePO4 battery size (long x width x high) 360 x 55 x 250, weight 8.1kg; Long x W x H) 360 x 55 x 306, weight 9.6kg, 2V/300Ah lead-acid battery size (long x W x H) 124 x 181 x 365, weight 19kg.

1 set of 48V/200Ah LiFePO4 battery pack and 1 group of 48V/300Ah lead-acid battery pack in the same installation mode, the former covers an area of 59% of the latter, the former weight is 28% of the latter. If consideration is given to the same load-bearing conditions in the engine room, LiFePO4 batteries can be installed in double-layer double columns, while lead-acid batteries need to be installed in single-layer double-columns, the former covers an area of 29% of the latter. The same set of 48V/300Ah LiFePO4 battery pack and lead-acid battery pack, in the same installation, the former covers an area of 59% of the latter, the former weight is 34% of the latter.

4, Long cycle life: LiFePO4 battery has more times the cycle life, especially suitable for use in the four types of power base stations with repeated power outages.

5, The investment is flat: 1 set of 48V /300Ah lead-acid battery price of about RMB8640 (set price: RMB1.2 / 2V. Ah), a set of 48V/200Ah LiFePO4 battery price of about RMB25,600 (market price: RMB8 / 3.2V. Ah), 1 set of battery insulation box price of about RMB10 million, 1 set of LiFePO4 battery (no insulation box) price is 1.37 times the price of 1 group of lead-acid battery (including insulation box). When the price of LiFePO4 battery fell to RMB6 / 3.2V. Ah, a set of LiFePO4 batteries (no insulation box) price is RMB192,000, the two costs are basically equal. In addition, the room area reduction, weight reduction can reduce the cost of building the engine room, LiFePO4 battery cycle life can be better can extend the battery replacement cycle, high temperature performance can save air conditioning electricity and so on.

6, High ambient temperature: lead-acid battery for outdoor stations, need to be installed in the insulation cabinet, in areas with particularly harsh climatic conditions, but also need to be buried under the permafrost layer, to installation and maintenance are extremely inconvenient. LiFePO4 battery is suitable for high ambient temperature, charging ambient temperature of 0 to 55 , discharge ambient temperature of -20 to 60 , suitable for inarguable room, no air conditioning, ambient temperature above zero outdoor station.


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