What should be paid attention to in the battery pack of electric bus

The battery pack of an electric bus is generally composed of several power lithium-ion battery modules and high-voltage control boxes after PACK production and assembly. After the PACK is completed, the battery box generally weighs about 200---400KG, so when designing the structure , First consider the installability of a single module, whether there are transport conditions, whether there are fixed conditions, whether there are fast loading and unloading conditions, and at the same time, consider the fixing and maintenance of the box on the whole vehicle to ensure that the battery can be quickly fixed and Separated from the car body; 2 the strength of the structure: Generally, the layout space of the battery pack in the whole vehicle is relatively compact, which means that the car factory will require the battery supplier to arrange the largest capacity battery in the effective space, which leads to In the structural design of the battery box, sheet metal parts will be used as much as possible to complete the production. Therefore, the strength of the box must be considered according to the layout position of the battery, because the battery module is quite heavy. If this problem is not considered, the battery The box body will be deformed during the subsequent transportation process, which is absolutely not allowed for the battery PACK; 3 module integration: After the single module PACK is finished, they must be connected in series to form a battery pack. At this time, mutual consideration should be given to each other. The serial connection between the batteries can meet the fast and safe serial interface form; 4 The layout of the battery box: The battery box is generally composed of battery series and parallel modules and electrical components such as BMS and insurance, which must be in the design process Consider the characteristics of electrical components, as well as the maintenance issues during use. In other words, it must be satisfied that on-site maintenance personnel can quickly maintain the electrical components of the single-box module; 5 internal insulation issues: the battery has been considered in the design of the structure There is a problem with the insulation of the positive and negative electrodes, but the uncertain factors of the car battery are too complicated, so the insulation conditions must be set separately during the PACK process to meet the impact, vibration, humidity and other complex environments. The battery is still safe Effective; 6-wire layout and fixation: Generally, the layout of the wires only needs to meet the reasonable wiring. The fixation problem should be emphasized. It is not enough to stick to the bracket with glue alone. It must be confined to the corresponding fixed point with a cable tie. It must be ensured that there is no possibility of shaking or loosening of the wiring terminal of the wire, otherwise there will be endless troubles! 7 Heat dissipation, dustproof, and waterproof problems: different batteries have different advantages and disadvantages, which depends on the shape and performance of the battery to deal with the heat dissipation, dustproof, and waterproof problems of the battery; generally, suction type heat dissipation is adopted. In this way, the hot air inside the battery box can be quickly discharged, and a lower temperature external airflow can be introduced to circulate away the heat from the battery surface-forced air flow and active temperature control. The ensuing problem is dust prevention. This problem is easy to solve, which is the processing method of material selection and structural solution. Waterproof is not considered in general car batteries, but for spray vehicles, sanitation vehicles and other vehicle power systems with special use environments, this issue must be considered in the structural layout. The airtightness of the battery box should be considered. The airtightness and water resistance of the wire inlet and outlet are very important. The water and vapor conditions faced by the vehicle during the overall or internal cleaning determine the designer's solution! 8 Corrosion resistance: This problem is relatively easy to be ignored, because the use of most electric buses and electric vehicles is still very limited. The instability of the safety of the battery system is considered, and it is generally not used in a corrosive environment. However, we cannot rule out that the vehicle will be exposed to corrosive air for a long time, such as coastal cities, where the water vapor in the air is relatively large, and the urban air pollution is more serious in areas, electrical components and cabinets. The exposed part of the device will cause corrosion damage and cause the system to be paralyzed. Therefore, when selecting electrical components and structural parts, beware of such reasons that the battery cannot work. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How is the history of battery development in my country