26650 battery

　　Buick analyzes VELITE6 power 26650 battery system and develops all-round core technologies

　　Recently, at the Buick Blue New Energy Technology Open Class, the reporter hand-assembled the power battery pack of Buick VELITE6PHEV and visited the power battery factory, and truly felt GM's advantages in power battery research and development, design, manufacturing and certification, as well as the intelligent manufacturing system of SAIC-GM Power Battery System Development Center.

　　As a key part of the electrification research and development of new energy vehicles, the performance of the power battery system is inseparable from the core technology of the battery system and the battery production and manufacturing technology. So, what core technologies does the new generation of modular high-performance ternary lithium-ion battery pack equipped with the plug-in hybrid Buick VELITE6 give to the battery system? And how to ensure the safety, reliability and durability of the battery system in harsh environments?

　　Specially developed all-round core technologies

　　It is reported that the power battery system of the Buick VELITE6 plug-in hybrid vehicle is specially developed according to the positioning and needs of VELITE6 in accordance with GM's global highest standard power battery research and development, design and test verification process. With a new generation of highly integrated modular design, Buick VELITE6 power battery system has leading and complete core technologies in the key fields of battery pack module design, BMS battery management system, thermal management system, battery packaging technology, etc.

　　The power battery system of Buick VELITE6 plug-in hybrid vehicle uses a large number of advanced fireproof high-strength composite materials, and the battery pack is more compact and thinner, which not only greatly improves the rigidity, strength and durability of the battery pack, but also further demonstrates its competitive advantage in energy density. Under the same unit energy, Buick VELITE6 power battery system is smaller in size and has better temperature adaptability and consistency.

　　As the core component to keep the battery system warm in winter and cool in summer, the capillary cooling fin is only 0.2 mm thick. The cleverly designed cooling fin guide grooves are evenly distributed on the battery, and the coolant can flow in the flow channel groove to take away the heat; the coolant can also be heated by the coil to heat the battery, ensuring that the battery is at the most suitable operating temperature even in extremely cold environments.

　　Compared with other manufacturers' module-level cooling, the power battery system of Buick VELITE6 plug-in hybrid vehicle adopts an independent liquid cooling system at the cell level, so that the heat dissipation cycle of the battery pack can be accurately distributed to each cell unit for cooling, ensuring that the temperature difference of the entire cell is controlled within 2°C, effectively ensuring the consistency of the cell; at the same time, its operating temperature range is as wide as -30°C~55°C.

　　The IP67-level sealing design not only keeps any dust and solid objects out, but also ensures the safe operation of the battery pack when the vehicle is wading. If a collision occurs, the high-voltage interlocking safety protection system will detect whether the connectors of the high-voltage parts are loose or the high-voltage wires are cut off, and take corresponding measures in time to intelligently cut off the battery relay and output voltage to prevent leakage.

　　In addition, even if the power battery system of Buick VELITE6 plug-in hybrid vehicle is squeezed, it will not cause risks such as cell electrode contact, high-voltage line short circuit or cooling system leakage, effectively preventing secondary accident damage.

　　The technicians on site revealed to reporters that the power battery system of Buick VELITE6 plug-in hybrid vehicles has passed multiple rigorous tests, including thousands of component and subsystem test items, and for each potential hazard, there are at least 3 independent safety protection measures to ensure the safety of the battery system, achieving a system failure rate of less than <10-8/h during the life cycle, which is more than 10 times higher than the general level in the industry.

　　Through battery system extrusion test, mechanical impact, external fire test, overcharge protection, short circuit protection, durability and waterproof immersion test, etc., and in an environmental chamber with a temperature difference range of -40℃~85℃, simulate the use conditions of extremely hot, extremely cold and high altitude areas to ensure the safety of the battery structure. The power battery system is assembled on the Buick VELITE6 model, and it will also undergo more than 100 system and vehicle tests to ensure the safety of the battery pack during the longer life cycle.

　　SAIC-GM Power Battery System Development Center

　　"Transparent" production of reliable and consistent battery products

　　The high-performance ternary lithium-ion battery packs equipped in Buick VELITE6 plug-in hybrid vehicles are assembled and produced at the SAIC-GM Power Battery System Development Center. Relying on the battery pack intelligent production line and assembly process as well as high-standard, high-tech quality control management, it provides solid support for the quality of the products.

　　The reporter saw that during the chip stacking and battery module assembly process, the entire process of loading, assembling, transporting and testing the battery modules of the battery cells and modules were all completed by robots or manipulators intelligently, with an automation rate of 100%, avoiding misoperation and unstable quality caused by manual operation, and ensuring the consistency and reliability of each battery module product.

　　The above-mentioned technicians confidently stated that "in the chip stacking and battery module assembly process, the accuracy of each loading/unloading/handling process of the robot is within 0.1-0.2mm", which improves the assembly efficiency, accuracy and quality stability of the product. After the assembly process, pressure control review is also used to ensure the stability of the overall quality.

　　Through the application of digital technology, each key component of the Buick VELITE6 plug-in hybrid vehicle has its own "ID card" for accurate subsequent traceability.

　　The advanced ultrasonic welding technology is used to weld the pole ear, which not only has no welding defects, but also can use different ultrasonic welding technologies for different materials. This technology is accurately positioned by industrial robots under the guidance of the visual system.

　　The battery assembly process is divided into three levels: battery cells, modules and battery packs. All of them need to be tested and evaluated for functionality, electrical performance and electrical insulation to ensure the safe production of the battery assembly line and the quality of the products shipped. Among them, the electrical performance test of the battery pack needs to be carried out through infrared thermal imaging detection technology with high thermal sensitivity and an ultra-wide temperature range of -20℃~+350℃, to achieve non-contact real-time temperature change monitoring within the entire product contour range, to ensure the quality and test safety of the Buick VELITE6 power battery system.

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