battery 18650 genuine

　　Research on the overall layout design of battery 18650 genuine cars

　　1. Introduction With the progress of industrialization of human society, problems of massive energy consumption and environmental pollution have arisen. Especially for the automobile industry, energy saving and environmental protection have become the themes of today's development. As a type of new energy vehicles, zero-emission battery 18650 genuine vehicles have attracted widespread attention from major multinational companies. At present, there is still a certain gap between my country's battery 18650 genuine vehicles and foreign countries in terms of vehicle integration.

　　2. Composition characteristics of battery 18650 genuine power system

　　The battery 18650 genuine vehicle power drive system uses a battery 18650 genuine power system, eliminating the traditional internal combustion engine and drive system. The battery 18650 genuine power system mainly consists of a power system (battery 18650 genuine stack, power battery), an auxiliary system (air system, hydrogen system, water system), and a control system. It mainly includes key components such as drive motor, electric stack, power battery, humidifier, air compressor, hydrogen bottle, hydrogen auxiliary, air filter, control unit and other key components. Figure 1 is the working diagram of the battery 18650 genuine power system.

　　3. Analysis of the overall layout of the power system of a certain brand of battery 18650 genuine-powered cars

　　At present, domestic battery 18650 genuine power system and its component products

　　Compared with traditional cars, there are still some problems that affect the basic parameters of the vehicle in terms of consistency, versatility, reliability, and integration.

　　3.1 Introduction to the power system layout of battery 18650 genuine vehicles at home and abroad

　　There are great differences in the development level of battery 18650 genuine power systems in various countries around the world. For example, General Motors' battery 18650 genuine power system has a higher level of integration. Its application in VOLT vehicles can basically reach the level of commercial operation. At present, domestic battery 18650 genuine power systems are not highly integrated and system components are scattered. Therefore, its layout is characterized by a decentralized layout. Table 1 introduces the layout of the power systems of several foreign brands of battery 18650 genuine cars.

　　3.2 General layout design of the power system of a certain brand of battery 18650 genuine car

　　In view of the characteristics of this power system, a certain brand of battery 18650 genuine car adopts a decentralized arrangement. The hydrogen storage system is arranged in the trunk compartment, the power battery is arranged under the rear seat, and the auxiliary and drive systems are arranged in the front cabin and central tunnel. (See Figure 2)

　　3.3 Load distribution calculation

　　The calculation of the vehicle quality parameters can be based on the parameters of the original vehicle and the battery 18650 genuine power system assembly, excluding the main assemblies or components that are not used in battery 18650 genuine vehicles. First calculate the parameters of each part, which are calculated from the mass coordinate parameters of the power system assembly, and then use the principles of mechanics to calculate the center of mass, mass, etc. According to the principle of moment balance:

　　The calculated coordinates of the center of mass in the ready state are: X=1304.4; Y=13.2; Z=473.

　　Calculation of vehicle axle load: Table 2 is obtained from the formula axle load F=M×(X/L).

　　3.4 Influence of vehicle parameters

　　In order to meet the requirements of high-speed driving and good stability of cars, the ground clearance of cars is very small, generally around 120mm. As a battery 18650 genuine car, the battery stack is arranged under the center floor. Even if the center floor is moved up or the strength of the front and rear suspension support springs is changed to raise the vehicle, the minimum ground clearance of the vehicle will be affected. Passability is greatly affected.

　　3·5 Influence of comfort

　　According to ergonomic experience, the reference values of various sitting angles are shown in Table 3. The electric stack is arranged under the central floor. The resulting upward movement of the floor takes up the leg space of the rear passengers, resulting in a smaller leg angle for the passengers, making it easy for them to feel fatigued after riding for a long time. It can be seen that the ideal layout space for the layout of the stacks of battery 18650 genuine cars should be considered to be arranged in the engine compartment.

　　3.6 Impact of luggage compartment

　　For hydrogen storage systems, hydrogen bottle storage is currently the most common method in the world. battery 18650 genuine vehicles of major companies are generally arranged in the trunk compartment. Considering the safety of hydrogen bottles, the hydrogen storage device must be isolated from the passenger compartment. The luggage compartment space of this brand's battery 18650 genuine sedan platform is 432L. However, after arranging the hydrogen bottles, only three standard suitcases can be placed, and the effective space is reduced to 165.5L. However, consumers generally have certain requirements for the luggage compartment, so storage The layout of the hydrogen system is also an issue that needs to be solved in the future.

　　3·7 Influence of heat dissipation performance

　　The heat dissipation problem of the battery 18650 genuine car also directly affects the performance of the stack system. Therefore, it has greater requirements on the fan performance of the front-end cooling module and the size and space of the radiator. In view of its compact front cabin space layout, heat dissipation performance requirements must be considered. There are generally two ways to improve heat dissipation performance in the layout: one is to increase the air inlet area, that is, to expand the area of the front bumper air inlet; the other is to reasonably arrange other components in the front cabin to ensure that there is enough space behind the radiator. and airflow channels to increase heat dissipation capacity.

　　3.8 Impact on vehicle safety

　　Vehicle safety is divided into active safety and passive safety. Among them, collision safety is an important indicator to measure passive safety. For battery 18650 genuine vehicles, since the hydrogen storage device is arranged in the rear cabin, in all crash tests, the deformation of the rear cabin and the integrity of the hydrogen storage system must be checked in rear collisions. Figures 3 and 4 are comparison pictures before and after the collision respectively. Table 4 lists the displacement of the colliding hydrogen bottle in three directions. It can be seen from the analysis results that the hydrogen bottle was squeezed during the collision, and the displacement of the hydrogen bottle was large, which would cause damage to the hydrogen bottle and the hard pipe joints of the hydrogen bottle, posing serious safety risks to the safety of the entire vehicle.

　　4. Suggestions on the development direction of battery 18650 genuine car vehicle platform

　　To sum up, if the battery 18650 genuine power system is to be well applied in the entire vehicle, it must at least carry out adaptive development in the following aspects to promote the process of productization of battery 18650 genuine cars.

　　4.1 Adaptable development of body structure The body system is changed from the load-bearing body commonly used in cars to a semi-bearing body or the width of the central tunnel is appropriately increased. The semi-bearing body has the advantage of being more flexible in the overall layout of battery 18650 genuine cars. First of all, the use of a semi-bearing body platform can effectively solve the problem of safe routing of high-voltage wires; secondly, the height space can be effectively utilized. If there is a breakthrough in battery or hydrogen bottle technology, the power battery or hydrogen bottle can be Moving forward can free up space in the trunk and improve collision safety without sacrificing ground clearance.

　　4.2 Adaptive development of chassis system

　　A very important factor affecting the improvement of the overall vehicle level of battery 18650 genuine cars is the low integration of the power system. Placing the battery 18650 genuine stack in the front cabin is the inevitable direction for the development of battery 18650 genuine cars. At present, a certain brand of plug-in battery 18650 genuine sedan has initially implemented the integrated design of the battery 18650 genuine stack and its control unit, which are arranged in the front cabin. Since the size of the front overhang has not been adjusted, the layout of the front cabin is still very compact. Without reducing the space in the front cabin, the length of the front suspension should be appropriately increased to facilitate lowering the height of the drive motor and reducer and increasing the effective space of the battery 18650 genuine stack. The lowering of the center of mass of the front cabin is beneficial to collision safety. Secondly, the steering system can adopt EpS electric steering. Compared with the currently used EHpS electro-hydraulic steering system, it will greatly save the space in the front cabin and reduce the difficulty of the overall layout. In the long run, once the line drive control system in chassis technology combined with the load-bearing chassis can be implemented, it will greatly increase the available space of the vehicle. The highly integrated battery 18650 genuine system will be arranged in the chassis frame, and the entire battery 18650 genuine car will The level of car design will be greatly improved.

　　4.3 Integrated design of battery 18650 genuine engine system

　　The main purpose is to solve the current flat design of the stack, carry out integrated design, integrate its control system and cooling system, adopt a frame design structure, and integrate the main components of the power system, such as cooling water pumps, fans, control units, etc. into the front cabin. Centralized layout. Using this solution can solve the passenger comfort and achieve reasonable distribution of the flow field in the front cabin, which will greatly improve the heat dissipation capacity of battery 18650 genuine cars.

　　4.4 Layout solutions for hydrogen storage systems

　　First, under the current specifications of domestic hydrogen storage bottles, the existing hydrogen bottle layout is changed, the hydrogen storage system including pipelines is designed in an integrated modular manner, and the assembly adopts modular assembly. The collision safety of the hydrogen storage system module was considered as a whole, and an anti-collision beam was added to the rear end. The original square steel rectangular frame was changed for the installation of the hydrogen bottle, and an H-shaped high-strength joist beam was used. The simulation results show that this method of rear collision is very ideal, and the hydrogen bottle and pipeline system are not damaged. Secondly, when the hydrogen bottle specifications can be designed and produced according to customer requirements, combined with the skateboard-type chassis platform, the hydrogen bottle will be able to move forward, effectively solving the safety protection and luggage compartment space issues in rear collisions.

　　5 Conclusion

　　This article combines several important parameters in the general layout design of a certain brand of battery 18650 genuine cars, analyzes several problems existing in the general layout design of battery 18650 genuine cars, and proposes some development directions and measures in the general layout design of battery 18650 genuine cars. It will serve as a reference for the subsequent improvement of the general layout design of battery 18650 genuine cars and the improvement of vehicle performance indicators.

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