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:2023-10-17 Hits: Popular:AG11 battery
Electric vehicles are vehicles that are powered in whole or in part by electric motors. At present, there are three main types of pure electric vehicles, hybrid electric vehicles and fuel cell vehicles. The commonly used power sources for electric vehicles currently come from lead-acid batteries, lithium batteries, nickel-metal hydride batteries, etc. Lithium batteries have high cell voltage, high specific energy and high energy density, and are currently the batteries with the highest specific energy.
However, precisely because of the relatively high energy density of lithium batteries, safety accidents will occur when misuse or abuse occurs. The battery management system can solve this problem. When the battery is under charging overvoltage or discharging undervoltage, the management system can automatically cut off the charging and discharging circuit, and its power balancing function can ensure that the voltage difference of a single battery is maintained within a small range.
1Battery management system hardware consists of system-specific hardware circuits, which can be divided into MCU modules, detection modules, and balancing modules. 1.1MCU module MCU is the core of system control. The MCU used in this article is the GZ16 model of the M68HC08 series. All MCUs in this series use the enhanced M68HC08 central processing unit (CP08). This microcontroller has the following characteristics: (1) 8MHz internal bus frequency;
(2) 16KB built-in FLASH memory; (3) 2 16-bit timer interface modules;
(4) Clock generator that supports 1MHz~8MHz crystal oscillator;
(5) Enhanced serial communication interface (ESCI) module. 1.2 Detection module In the detection module, the voltage detection, current detection and temperature detection modules will be introduced respectively. 1.2.1 Voltage detection module In this system, the microcontroller will detect the overall voltage and single cell voltage of the battery pack. There are two methods for detecting the overall voltage of the battery pack: (1) using a dedicated voltage detection module, such as a Hall voltage sensor;
(2) Use precision resistors to construct a resistor voltage dividing circuit. Using a dedicated voltage detection module is more expensive, requires a specific power supply, and the process is complicated. Therefore, a voltage dividing circuit is used for detection. The voltage variation range of a 10-cell lithium manganate battery pack is 28V ~ 42V. Use 3.9M? and 300k? resistors to divide the voltage. The variation range of the collected voltage signal is 2V ~ 3V, and the corresponding AD conversion results are 409 and *. For the detection of single cells, flying capacitor technology is mainly used.
The current sampling circuit in this system is shown in Figure 2. When the battery is discharged, a constantan wire is used to detect the current signal, and the detected voltage signal is amplified by a differential mode amplifier and converted into a voltage signal of 0~5V and sent to the microcontroller. If the discharge current is too large and the voltage signal detected by the microcontroller is relatively large, it will drive the transistor to change the gate voltage of the MOS tube and turn off the discharge circuit. For example, for a 36V lithium manganate battery, the protection current is set to 60A.
The resistance of constantan wire is about 5mΩ. When the current reaches 60A, the voltage of the constantan wire reaches about 300mV. In order to improve the accuracy, the voltage is amplified 10 times through the amplifier and sent to the microcontroller for detection. 1.2.3 Temperature detection During the charging and discharging process of the battery pack, part of the energy is released in the form of heat. If this part of the heat is not removed in time, it will cause the battery pack to overheat. If the temperature of a single nickel-metal hydride battery exceeds 55°C, the battery characteristics will deteriorate, and the charge and discharge balance of the battery pack will be disrupted, resulting in permanent damage or explosion of the battery pack. In order to prevent the above situation from happening, the battery pack temperature needs to be monitored in real time and heat dissipated. A thermistor is used as a temperature sensor for temperature sampling.
Thermistor is a heat-sensitive semiconductor resistor whose resistance value decreases as the temperature increases. The resistance temperature characteristics can be approximately expressed by the following formula: 1.3 Balancing module Commonly used balancing methods in battery packs include shunt method, flying capacitor balancing charging method, inductor energy transfer method, etc. In this system, more I/O ports are needed to drive the switch tubes, and the I/O ports of the microcontroller are limited, so the charging balancing method of converting full charge to single charge is adopted. The schematic is shown in Figure 3. Q4 is the switch that controls the overall charging of the battery pack, and Q2, Q3, and Q5 are the switches that control the charging of a single battery.
Taking a 10-cell lithium manganate battery pack as an example, the voltage at both ends of the main coil of the transformer is 42V, and the voltage of the secondary coil is the battery's rated voltage of 4.2V. At the beginning, Q4 is turned on, Q2, Q3, and Q5 are turned off. The voltage of a single battery continues to rise. When it is detected that the voltage of a certain battery reaches the rated voltage 4.2V, the voltage detection chip sends a driving signal, turns off Q4, and turns on Q2. , Q3, Q5, the entire system enters the single charging stage, and the battery that is not fully charged continues to be charged, so that the battery that reaches the rated voltage keeps the rated voltage unchanged. After testing, the voltage difference will not exceed 50mV. 2SOC power detection In lithium-ion battery management systems, commonly used SOC calculation methods include open circuit voltage method, Coulomb calculation method, impedance measurement method, and comprehensive table lookup method [3].
(1) The open circuit voltage method is the simplest measurement method, which mainly determines the size of the SOC based on the size of the battery's open circuit voltage. It can be seen from the operating characteristics of the battery that there is a certain corresponding relationship between the open circuit voltage of the battery and the remaining capacity of the battery. (2) The Coulomb calculation method measures the charging and discharging current of the battery, integrates the product of the current value and the time value, and then calculates the amount of electricity charged and discharged by the battery, and uses this to estimate the SOC value. (3) The impedance measurement method uses a certain linear relationship between the internal resistance of the battery and the state of charge SOC, and calculates the internal resistance of the battery by measuring the voltage and current parameters of the battery, thereby obtaining an estimate of the SOC. (4) In the comprehensive look-up table method, the remaining capacity SOC of the battery is closely related to the voltage, current, temperature and other parameters of the battery. By setting up a related table and inputting parameters such as voltage, current, temperature, etc., the remaining capacity value of the battery can be queried.
Read recommendations:
The 6 major advantages of electric vehicle lithium battery lithium battery wholesalers will explain.
The advantages of electric vehicle fuel cells
Last article:3.2v lifepo4 battery 200ah.Research and development of high-power solar panels
Next article:lifepo4 battery 48v powerwall.About charging method of high-voltage lithium-ion battery pack
Popular recommendation
801520 battery manufacture
2023-03-22601525 polymer battery company
2023-03-22801752 polymer battery
2023-03-22battery 18650 rechargeable
2023-03-22602535 battery Manufacturing
2023-03-22Lithium Battery GN60120
2022-08-19Rack-mounted energy storage battery GN-5120
2022-09-27802540 800mAh 3.7V
2022-06-27Ni-MH AAA400mAh 1.2V
2022-07-01803040 1000mAh 3.7V
2022-08-19R20
2022-12-0114500 450MAH 3.7V
2022-10-15Ni-MH AAA700mAh 1.2V
2022-07-01LR03
2023-02-07102540 1100MAH 3.7V
2023-06-12li ion 18650 battery pack maker
2023-06-25802540 lipo battery
2023-06-2518650 battery pack company
2023-06-25lithium lon battery energy storage system
2023-06-25401030 lipo battery
2023-06-25Test standards for lithium-ion batteries
2024-06-14General requirements for ship batteries
2024-08-08Lifespan of Cylindrical Lithium - ion Batteries
2025-03-14The influence of charge transfer resistance on low-temperature performance.LR44 battery
2024-07-03Unveiling the Advantages of High - Performance Lithium - Ion Batteries
2025-04-10The service life of ternary lithium battery is usually several years
2022-11-25Introduction to lithium battery conductive coating product introduction
2023-07-15Lithium power battery characteristics.401030 battery
2023-05-27Lithium battery charging and discharging cycle.401030 lipo battery
2023-07-0318650 battery 4800mah.What are the application fields of polymer lithium batteries
2023-10-14