General electric car battery has several pieces
Back
2022/11/19 14:54:56
It's hard to say. It depends on what you buy. Electric vehicle batteries are generally lead-acid batteries, each battery is 12 volts, the capacity of 10Ah[ampere], 12Ah, 14Ah, 17Ah, 20Ah. The bigger the number, the bigger the capacity, the farther the car goes, the higher the price. However, 17Ah and 20Ah are bigger, depending on how well your car's battery case will fit. You buy batteries based on how many batteries you have and how much capacity you want. Battery good brands are Panasonic, Tianeng, super, Huafu, Fengfan and so on. More than a hundred pieces, will last about two years.
There is only one battery case, and inside it is a battery pack. The working voltage of different models is also different. The working voltage of electric bicycles is 36v and 48v. According to the form of joint series, there are generally 2 to 6 individual batteries connected into a battery pack.
1. The capacity data is missing. If the battery is applied to 72AH,
2, charge once, power consumption =72*200*80%*130%*150%/1000=22.464 degrees of electricity,
3. When charging, the battery converts electrical energy into chemical energy with a conversion efficiency of about 50%.
4, discharge, the battery can only discharge 80% of the electricity, over discharge, will lead to shortened battery life, battery over discharge, its life shortened by 80%,
5. The average efficiency of the charger is about 70%.
A ternary lithium battery of the same weight has a longer range than a lithium iron phosphate battery. However, its disadvantages are also obvious, when its temperature is 250-350℃, the internal chemical composition begins to decompose, so the battery management system puts forward extremely high requirements, need to install insurance devices for each battery respectively, in addition, because of the small volume of the single battery, so the number of single battery is very large. This undoubtedly further increases the difficulty of control for the battery management system.
Nickel-metal hydride (NIMH) battery is another mainstream type of electric vehicle power battery except lithium battery, which has been developed gradually since the 1990s. Its energy density is not much different from that of ordinary lithium batteries, about 70-100Wh/kg, but because the voltage of single battery is only 1.2V, which is 1/3 of that of lithium batteries, the volume of its battery pack is larger than that of lithium batteries when the demand voltage is certain. Like lithium batteries, NIMH batteries also need a battery management system, but it pays more attention to battery charge and discharge management. The reason is that nickel metal hydride batteries have a "memory effect", that is, the capacity of the battery will attenuate in the process of cyclic charging and discharging, and overcharging or discharging may aggravate the capacity loss of the battery (lithium battery this characteristic is almost negligible). Therefore, for manufacturers, nickel metal hydride battery control system in the setting will take the initiative to avoid overcharge and discharge, such as the battery charge and discharge interval artificial control in a certain percentage of the total capacity range, in order to reduce the capacity decay speed.
Fuel cells are the ideal source of energy for future cars. A fuel cell is not actually a "battery," but rather a large system of generating electricity. Because of its high energy conversion efficiency, no pollution, long life, smooth operation and other characteristics, it is recognized as the best energy for future vehicles in the industry. Simply put, a fuel cell is a device that converts chemical energy into electricity through chemical reactions, and the source of energy is mainly generated by the constant supply of fuel and oxidizer.
Pure electric vehicle refers to the vehicle which is powered by on-board power supply and drives the wheel with motor, and meets the requirements of road traffic and safety regulations. Due to its smaller environmental impact than traditional cars, its prospects are widely optimistic, but the current technology is not yet mature.
BatteryElectricVehicle (BEV) is a vehicle powered entirely by rechargeable batteries such as lead-acid, nickel-cadmium, nickel-metal hydride or lithium-ion batteries. Although it has a long history of 134 years, but has been limited to some specific applications, the market is small. The main reason is due to various types of battery, the widespread existence of high price, short life, size and weight, long charging time and other serious shortcomings.
composition
The components of electric vehicle include: electric drive and control system, drive
Force transmission and other mechanical systems, to complete the task of the work device, etc. The electric drive and control system is the core of the electric vehicle and also the biggest difference from the internal combustion engine car. Electric drive and control system consists of drive motor, power supply and motor speed control device. Other components of an electric car are basically the same as those of an internal combustion engine car.
It provides electricity to the drive motor of an electric vehicle, which converts electrical energy from the source into mechanical energy. The most widely used power supply is lead-acid battery. However, with the development of electric vehicle technology, lead-acid battery is gradually replaced by other batteries due to its low energy, slow charging speed and short service life. The power supply under development mainly includes sodium-sulfur battery, nickel-cadmium battery, lithium-ion battery, fuel cell, etc. The application of these new power supplies opens up a broad prospect for the development of electric vehicles.
The function of a drive motor is to convert electrical energy from a power source into mechanical energy through a transmission device or a working device that drives the wheel directly. But DC motor due to the existence of reversing spark, small power, low efficiency, maintenance workload; With the development of motor control technology, it is inevitable to be gradually replaced by brushless DC motor (BLDCM), switched reluctance motor (SRM) and AC asynchronous motor, such as unenclosed disc axial magnetic field DC series motor.
Speed control device
Motor speed control device is set for the electric vehicle speed change and direction change, its role is to control the voltage or current of the motor, complete the motor drive torque and rotation direction control.
On early electric vehicles, DC motor speed regulation is realized by connecting resistance or changing the number of turns of the motor's magnetic field coil. Because of its speed regulation is a level, and will produce additional energy consumption or the use of motor structure is complex, has been rarely used. Widely used is the thyristor chopper speed regulation, by evenly changing the end voltage of the motor, control the motor current, to achieve the motor stepless speed regulation. In the continuous development of electronic power technology, it has gradually been replaced by other power transistors (GTO, MOSFET, BTR and IGBT, etc.) chopper speed regulating device. From the point of view of the development of technology, with the application of new driving motor, the speed control of electric vehicles into the application of DC inverter technology, will become an inevitable trend.
In the control of rotation change of driving motor, DC motor relies on contactor to change the current direction of armature or magnetic field to realize the rotation change of motor, which makes the circuit complicated and the reliability reduced. When the AC induction motor is used, the motor steering can be changed only by changing the phase sequence of the three phase current of the magnetic field, which can simplify the control circuit. In addition, the AC motor and its frequency conversion speed control technology make the braking energy recovery control of electric vehicles more convenient, the control circuit is more simple.
The function of electric vehicle transmission is to transfer the motor's drive torque to the vehicle's drive shaft. When electric wheel drive is used, most parts of the transmission are often ignored. Because the motor can be started with a load, electric cars do not need the clutch of traditional internal combustion engine cars. Because the rotation of the drive motor can be changed by circuit control, electric vehicles do not need to reverse the transmission of internal combustion engine cars. When using motor stepless speed control, electric vehicles can ignore the transmission of traditional vehicles. When electric wheel drive is adopted, electric cars can also omit the transmission differential of traditional internal combustion engine cars.
The function of the driving device is to turn the driving torque of the motor into the force on the ground through the wheel and drive the wheel to walk. It has the same composition as other cars, consisting of wheels, tires and suspension.
The steering device is set for realizing the turning of the car, which is composed of steering machine, steering wheel, steering mechanism and steering wheel. The control force acting on the steering wheel, through the steering machine and steering mechanism to make the steering wheel deflect a certain Angle, to achieve the steering of the car. Most electric vehicles have front-wheel steering, and industrial forklifts often use rear-wheel steering. The steering devices of electric vehicles include mechanical steering, hydraulic steering and hydraulic power steering.
Like other cars, the braking device of electric vehicles is set for slowing down or stopping the car, which is usually composed of the brake and its control device. On electric vehicles, there are generally electromagnetic braking devices, which can use the control circuit of the driving motor to realize the power generation operation of the motor, so that the energy of the deceleration braking is converted into the battery charging current, so as to be recycled. At present, domestic electric vehicles in high-power passenger vehicles, to provide air braking equipment has endurance NAILI sliding vane air compressor, mainly compressed air braking mode.
The working device is specially set for industrial electric vehicles to complete the operation requirements, such as the lifting device of electric forklift, door frame, fork and so on. Forklift and gantry tilt are usually accomplished by a hydraulic system driven by an electric motor
Previous
