Since the emergence of pure electric vehicles, power battery technology has always been the key technology of a pure electric vehicle, which not only determines the safety of the vehicle, but also determines the endurance, performance and cost of the vehicle.
We can define the early development of power battery technology as the 1.0 era, in the 1.0 era, almost all products use standardized modules (VDA/MEB), by forming small modules of batteries. After that, a plurality of such molds are assembled into the battery pack to form a whole power battery. The advantage of such a method for car companies is that the development is simple, but due to the inability to flexibly match the power and voltage, and the shortcomings of many parts and high system costs, car companies have begun to develop new power battery pack technology.
With the continuous breakthrough of battery pack technology, we have entered the 2.0 era in the middle of the development of power batteries, CTP large modules and moduleless technology have emerged, compared with the 1.0 era, the volume utilization rate has increased by 15%-20%; the number of parts has been reduced by 15%-20%; and the production efficiency has increased by 30%.
In the era of power battery technology 2.0, the mileage of pure electric vehicles has been further improved, and the cost of the whole vehicle is also reduced with the reduction of parts and the improvement of production efficiency, and we have also ushered in the rapid development stage of pure electric vehicles. With the continuous update of technology, we are also about to usher in the 3.0 era of power battery technology, just on April 25, Zero Run Car held a press conference, officially released its CTC battery chassis integration technology, the release of this technology also made Zero Run Car become one of the earliest enterprises to realize the integration of CTC battery chassis mass production technology.
CTC battery chassis integration technology
In the era of power battery technology 1.0 and 2.0, the battery pack is designed as a separate component. CTC battery chassis integration technology is different from the 1.0 and 2.0 eras, the new technology is in the early stage of vehicle development of the battery pack as part of the body structure to design.
Zero-run intelligent power CTC technology, or cell-to-chassis, refers to the integrated design of batteries, chassis and car bodies, simplifying product design and production processes. Innovatively applied CTC double skeleton ring beam structure, combining the battery skeleton structure and chassis body structure into one. Simply put, the body structure is used as the external structure of the battery pack, and the design of the battery pack part is cancelled, so that this part of the design is both the body chassis structure and the battery structure.
CTC battery chassis integration technology advantages
Through this new structural design, the entire chassis structure of the car body can be coupled with the battery tray structure. Compared with the 1.0 era and the 2.0 era, by reducing redundant structural design, the number of parts can be effectively reduced, and the overall structural efficiency is higher. While improving the space utilization rate and system specific energy, the battery impact resistance and the torsional stiffness of the body are greatly improved by complementing the body and the battery structure. According to official tests, the torsional stiffness of the body is increased by 25%, providing excellent driving performance, excellent handling and better response; the higher the body stiffness, the stronger the resistance to resonance, and the better the NVH performance.
In addition to the reduction of the number of parts and the increase in body torsional stiffness, the CTC battery chassis integration technology can make the body have a larger battery capacity space, compared with the traditional solution battery layout space increased by 14.5%, can increase the endurance of 10% while improving the battery insulation performance, alleviating the winter power loss defects.
In addition, this highly integrated, less component design also brings a more spacious driving space, eliminating the installation gap between the battery pack and the body, and increasing the vertical space of the body by 10mm, so that the user has a more comfortable height space and the vehicle space layout is more flexible.
In terms of safety, CTC double skeleton ring beam structure (battery tray + body structure beam to form a plurality of ring structure) design, and in the process of research and development, CTC technology has been carried out in multiple rounds of rigorous tests, such as bottom ball hitting, extrusion, thermal diffusion and nearly 30 tests to ensure battery safety, of which 8 safety test results far exceed national standards.
The above is specific to the product performance of the part, for a car company, the birth of a new technology is not only reflected in a short period of time in a certain product, CTC battery chassis integration technology also has a high adaptability, and the vehicle matching degree is high, can be quickly flexible mass production. Through a high degree of integration and modularity, it can be adapted to future models of all levels and types across platforms. In terms of scalability, the technology is also compatible with intelligent and integrated thermal management systems. In the future, it can be compatible with 800V high-voltage platform, support 400kW super fast charging, and can realize "refueling" charging, charging for 5 minutes, and endurance of 200+km.
The combination of soft and hard is strengthened with safety
For power batteries, the external hardware structure can only ensure the safety of the battery pack when it is impacted by external forces. In order to control the safety of the entire battery pack, the BMS management system is also an indispensable technology.
Paired with CTC battery chassis integration technology is the zero-run AI BMS big data intelligent battery management system. The system can realize ai BMS based on the combination of BMS and cloud platform online and offline, integrate big data and AI deep learning and other related tools, and achieve all-round improvement in battery safety, battery life, and battery performance, with data monitoring, safety warning, usage statistics, vehicle network interaction and other functions.
In terms of safety early warning, by obtaining the measurement data of the battery's current, voltage, temperature and other measurement data and comparing with the test parameters, the battery status is early warning in real time; a large number of measurement data are accumulated, and the medium- and long-term early warning is brought based on big data analysis and battery historical state AI learning analysis, so as to realize the full-time safety warning of the intelligent battery.
In terms of prolonging battery life, compared with the previous method of estimating battery life with battery capacity attenuation, AI BMS will realize the estimation of battery health status based on big data and cloud battery portraits; compared with the thermal management strategy based on parameter calibration, AI BMS will realize intelligent energy management based on optimal utilization of battery energy; compared with fault identification based on threshold calibration, AI BMS will establish a knowledge graph network in the cloud, and realize online and offline linkage of safety early warning based on AI learning to extend battery life. Optimize battery performance for the purpose.
Hitch a ride on the new technology product C01
Based on the above technology, zero-run cars have also created a new product. According to the disclosure, the new car will be named C01, the new car is based on the zero-run C platform developed a medium and large car, with a 5050mm body length and 2930mm wheelbase, in terms of design follow the zero-run C11 many elements.
In terms of performance, the battery space utilization rate is increased through the CTC battery chassis integration technology, so that the battery capacity reaches 90kWh, which can make the new model C01 have a comprehensive working condition of 700+ kilometers of ultra-long real endurance. In terms of power, the new car also has a 3-second acceleration capability.