Lithium Battery 3.7V Lithium Polymer Battery 3.2V LifePo4 Battery 1.2V Ni-MH Battery Button Coin Battery
3.7V Battery Pack 7.4V Battery Pack 11.1V Battery Pack 14.8V Battery Pack Other Battery Pack
Sino Science&Technology Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of Lifepo4 batteries,energy storage battery,portable UPS power supply,personalized customization lithium battery pack etc .
Environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery,3.7V lithium polymer battery, NiMH battery , NiCD battery ,Lead acid battery,dry cell battery ,alkaline battery ,heavy duty battery, button cell battery etc. we devote to R&D,innovation ,production & sales
Shenzhen Green Power Energy Battery Co.,ltd specializes in a wide range of digital battery such as environmental cylindrical 18650 21700 32700 26650 14500 18500 lithium ion rechargeable battery, LifePO4 battery, 3.7V lithium polymer battery, NiMH battery, NiCD battery, dry cell battery, alkaline battery, heavy duty battery, button cell battery etc. we devote to R&D, innovation, production & sales. With automatic production machines we have been exported goods to all over the world over 15years. We have complete exported certificate such as KC, CE, UL, BSCI, ROHS, BIS, SGS, PSE etc
Dongguan Datapower New Energy Co.,ltd is a high-tech production enterprise which specialize in the R&D and production&sale of lithium polymer batteries,drone battery,airplane batteries &battery pack etc.
Anhui Seong-hee New Energy Technology Co.,ltd is a high-tech production enterprise which specialize in the R&D and production of primary batteries. And mainly produces and sells alkaline batteries & carbon zinc batteries. there are size AA, AAA, C, D, 9V etc
Guizhou STD Battery Co.,ltd is a high-tech production enterprise which specialize in the R&D and production & sale of lithium polymer batteries, drone battery, airplane batteries & battery pack etc.
release time:2024-03-22 Hits: Popular:AG11 battery
Research and design of portable series 18650 battery 2200mahvoltage detection system
Series battery packs are widely used in communications radio stations, portable electronic equipment, aerospace satellites, electric whiteboards, electric vehicles, and UpS. Usually the performance of the single cells in the 18650 battery 2200mahdirectly affects the overall performance of the battery pack. In order to improve the reliability of the battery pack, the performance of the single cells should be consistent. For important equipment, it is necessary to frequently monitor all single cells online, that is, measure the single cell voltage.
There are many ways to measure the voltage of a single cell. The simplest one is to use the resistance dividing method: measure the voltage of each series node in turn. Since the measured voltage is the total voltage and the single cell voltage only accounts for a part, the measurement accuracy is as follows. The ratio is reduced; another measurement method is to use an isolated operational amplifier for each single cell. This operational amplifier can convert the battery voltage to a unified reference ground voltage and avoid drift errors and leakage currents caused by resistive voltage division. However, it is large in size and expensive, and is only suitable for those occasions where high measurement accuracy is required and leakage current and cost are not considered. In addition, the third method is to use relay array selection for measurement, which is complicated to control the switches. At present, the most common voltage measurement applications are the operational amplifier differential amplification method and the direct sampling method. However, these methods have the disadvantages of complex circuits and large volumes. They have certain limitations when used in fields that require volume and weight. Therefore, here we propose a measurement method that uses ordinary optocoupler instead of linear optocoupler, and a portable series 18650 battery 2200mahvoltage detection system with C8051F410 embedded microcontroller as the core.
2 System working principle
The portable series 18650 battery 2200mahvoltage detection system consists of a battery voltage conversion circuit, a C8051F410 microcontroller and an LCD liquid display, as shown in Figure 1.
2.1 Battery voltage conversion principle
The battery voltage conversion circuit is shown in Figure 2. The conversion circuit is composed of Nantong Optocoupler TLp521-1 and operational amplifier A1. The resistor Rb is the sampling resistor, and the capacitor Cn is used to improve the anti-interference ability.
The system uses embedded microcontroller C8051F410. The device uses a high-speed 8051μC core and operates at a speed of up to 50Mi/s, which minimizes power consumption and electromagnetic radiation and improves the system's anti-interference ability. It has a built-in 12-bit A/D converter with zero bit error rate and a sampling rate of up to 200kS/s, a maximum of 24 A/D conversion circuit input ports, simplifying the peripheral A/D conversion channel switching control circuit and achieving high-accuracy analog sampling; in power-saving mode, the typical current is less than 1μA at 32kHz The operating current is only 16μA. Based on the above characteristics, the C8051F410 microcontroller is used as the core of the system to simplify the design of system signal sampling and sampling channel control circuits and reduce the system volume. Use the circuit shown in Figure 2 to convert the 21-cell battery voltage. The system's liquid crystal display circuit uses LCD low-power driver pCF8563 and I2C bus interface, making the connection simple and reliable.
3Test data
In the voltage measurement experiment, Ra=5kΩ, Rb=5kΩ, the operational amplifier was LM324, and the comparison reference test equipment was Agilent 34401 (DC voltage test accuracy is 0.001V). A 18650 battery 2200mahconsisting of 10 cells was tested. Table 1 shows the system test voltage comparison, and Figure 5 shows the measurement error. It can be concluded from Table 1 and Figure 5 that the measurement error of the 12V 18650 battery 2200mahsystem is less than 0.1%.
4 Conclusion
After theoretical analysis and experimental verification, this battery monitoring system has advantages: (1) Using low-cost ordinary optocoupler to measure a single cell of the 18650 battery 2200mahcan meet the system accuracy requirements, saving 90% of the device cost, and simplifying the circuit design; (2) ) Due to the high isolation voltage of the optocoupler, the measurement range of the series battery voltage of this system can reach 2000V, which is 3 to 5 times higher than the withstand voltage of the relay; (3) The embedded C8051F410 microcontroller is used, which allows direct input of multiple Up to 24 analog signals, simple measurement circuit and small size.
In summary, the system realizes high-precision applications in which linear optocouplers are replaced by ordinary optocouplers, and low-cost circuits are used to solve high-precision and large-range voltage measurement problems. The characteristics of small size, light weight and low cost make the system have good application prospects in realizing portable application of 18650 battery 2200mahtesting equipment.
Read recommendations:
What is a ternary lithium battery?lifepo4 48v 100ah lithium ion battery
Why is it full of nickel -metal hydride battery charging.solar energy storage lithium ion battery 15
Last article:18650 battery 2500mah
Next article:18650 3500mah battery
Popular recommendation
26650 battery wholesale
2023-03-22601848 battery manufacturer
2023-03-22601435 battery Processing
2023-03-22connector for energy storage battery manufacturer
2023-05-10601435 lipo battery
2023-03-22503759 1200mAh 11.1V
2022-08-19Ni-MH AAA800mAh 1.2V
2022-07-01703048 1100MAH 3.7V
2023-06-10551521 130MAH 3.7V
2023-06-12Coin Battery LR 41
2022-10-15601525 170mAh 3.7V
2022-07-01Lithium Battery GN6020
2022-07-29LR03
2022-11-223.2V 304Ah
2022-10-127/AAA USB 1.5V 600mWh
2023-06-29no. 7 alkaline battery
2023-06-2518650 battery pack maker
2023-06-2518650 battery pack company
2023-06-25CR2032 button cell battery
2023-06-2518650 battery pack sales
2023-06-25How to reduce fuel power lithium batteries to reduce platinum metal dosage
2023-02-22Discussion on the new market of lithium iron phosphate battery
2022-11-04Lead-acid batteries
2023-02-03Development of Lithium Battery Materials
2024-04-17Drone battery charging.portable energy storage battery power supply Manufacturing
2023-04-24Overview of lithium iron phosphate battery
2022-12-07Why does the 18650 lithium battery pack bring a protective board.48v solar power energy storage powe
2023-03-28Can lithium iron phosphate batteries be used at minus 10 degrees?
2023-05-16LR1121 battery.Series and parallel connection method for lithium batteries
2023-10-11Lithium battery recovery.18650 battery 1800 mah
2023-06-09