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First of all, electric drive is the only way on the road to zero emission. The power battery with excellent performance depends on the core technology of battery system and battery manufacturing technology. Last week, Uncle Long went to the lab and power battery development center of SAIC General Motors to learn more about the power battery technology and production details of Buick VELITE6. He gained a lot and shared it with you.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

The importance of the power battery system for new energy vehicles is self-evident. Before we can experience the real vehicle of Buick VELITE6 for the time being, let's first understand how the power battery of the plug-in hybrid Buick VELITE6 is built.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

At present, General Motors has launched three new energy products on the Chinese market, including Cadillac CT6 plug-in hybrid vehicle, Buick VELITE 5 incremental hybrid vehicle and Baojun E100 pure electric vehicle. The first two models have been experienced by Longshu. As an important place for the strategic layout of the Buick brand "electrification, networking, intelligence and sharing", the plug-in hybrid vehicle Buick VELITE 6 plug-in hybrid vehicle and its sister model VELITE 6 pure electric vehicle will also be listed in succession.

Customized compact lightweight battery pack

The power battery pack of the Buick VELITE 6 plug-in hybrid car is customized around the body structure. The overall appearance characteristics of the battery pack are very obvious. It is composed of the upper cover and the metal lower cover made of fireproof high-strength composite materials, which not only greatly improves the rigidity, strength and durability of the battery pack, but also increases the energy density of the battery pack. Because of its smaller size, the passenger space in the body will also be more abundant.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

We all know that the activity of lithium battery will change with the temperature. In order to keep the battery working at the most comfortable working temperature, the power battery of Buick VELITE 6 plug-in hybrid car adopts a liquid-cooled structure that is warm in winter and cool in summer. It is an independent liquid-cooled system at the core level, with a wide operating temperature range of - 30 ℃~55 ℃ and strong adaptability to ambient temperature.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

The patented lamellar liquid cooling technology enables the heat dissipation cycle of the battery pack to be accurately distributed to each cell unit for cooling, ensuring that the temperature difference of the whole cell is controlled within 2 ℃, and effectively ensuring the consistency of the cell.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

As the core component to keep the battery system warm in winter and cool in summer, the capillary cooling strip is only 0.2mm thick. The ingeniously designed cooling fin guide groove is evenly distributed on the battery, and the coolant can flow in the channel groove to take away heat; The cooling liquid can also be heated by the coil to make the battery warm up. Even in the extremely cold environment, it can also ensure that the battery is at the most suitable operating temperature.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

With liquid cooling, the sealing of the battery pack is extremely important. The IP67 waterproof and dustproof seal design is the highest of its kind, which not only eliminates any dust and solids, but also ensures the safe operation of the battery pack when the vehicle is wading.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

Battery system test room

Safety, reliability and durability: self-cultivation of high standard automobile power battery

Buick VELITE 6 plug-in hybrid car power battery pack is assembled and produced by SAIC General Motors Power Battery System Development Center. Long Shu was lucky to visit the whole process of production and manufacture, and experienced the world's leading intelligent production line and assembly process of battery pack in a close distance.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

After assembling the battery module on the spot, Uncle Long realized the complexity of the battery module and deeply felt that automation was imperative. The whole process operation of charging, assembly, transportation and battery module testing of the battery cells and modules in the power battery system development center of SAIC General Motors is intelligently completed by robots or robots, with the automation rate of 100%, to avoid misoperation and quality instability caused by manual operation, and to ensure the consistency and reliability of each battery module product.

In the process of chip stacking and battery module assembly, the accuracy of each loading/unloading/handling process of the robot is within 0.1-0.2mm, which greatly improves the assembly efficiency, accuracy and quality stability of the product. After the assembly process, the stability of the overall quality is also ensured through pressure control review.

Every key part can be intelligently traced

We can see that every component has a two-digit code. After scanning the code with a mobile phone habitually, the result is a set of consecutive numbers, which are actually the "ID card" of the component; Through the application of digital technology, not only the real-time collection, monitoring and early warning of parts data are realized in the assembly process, but also the product information traceability system can be used for accurate follow-up traceability.

The battery assembly process is divided into three levels, namely, cell, module and battery pack. The functional, electrical performance, electrical insulation and other safety inspection and evaluation are required to ensure the safe production of the battery assembly line and the quality of the ex-factory products. The electrical performance test of the battery pack needs to pass the infrared thermal imaging detection technology with high thermal sensitivity and an ultra-wide temperature range of - 20 ℃~+350 ℃ to realize the non-contact real-time temperature change monitoring within the whole product contour range, and ensure the quality and test safety of the Buick VELITE 6 power battery system.

High-voltage interlocking safety protection system

Before the power battery of the Buick VELITE 6 plug-in hybrid car leaves the factory, it also needs to pass multiple rigorous tests, including thousands of parts and subsystems test items, and for each potential hazard, at least three independent safety protection measures are provided to ensure the safety of the battery system, so that the system failure rate within the life cycle is less than 10-8/h, which is more than 10 times higher than the industry's general level. Through the battery system extrusion test, mechanical impact, external fire test, overcharge protection, short circuit protection, durability and waterproof immersion test, and in the environmental cabin with a temperature difference of - 40 ℃~85 ℃, simulate the operating conditions in extremely hot, extremely cold and high altitude areas to ensure the safety of the battery structure. The power battery system has been assembled on the Buick VELITE 6 model and has undergone more than 100 system and vehicle tests to ensure the safety of the battery pack in the longer life cycle.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

In case of a collision accident, the high-voltage interlock safety protection system will detect whether the connectors of high-voltage parts are loose or the high-voltage wire is cut off, and take corresponding measures in time to intelligently cut off the battery relay and output voltage to prevent leakage. Thanks to the high standard safety design, even if the power battery system of the Buick VELITE 6 plug-in hybrid car is squeezed, it will not lead to the risk of electrode contact, high-voltage circuit short circuit or cooling system leakage, effectively preventing secondary accident injuries.

Safety, reliability and durability: self-cultivation of high standard automobile power battery

summary

From a small piece of battery cell to assembling into a single battery cell and then assembling into a complete set of battery packs, the number of workers in the advanced automatic chemical plant is even smaller than that of our visitors. Automated production avoids the unstable factors caused by human factors to the maximum extent, and production is of great significance in terms of efficiency and quality control. The advanced battery factory is fundamental to the automobile manufacturers who are moving towards zero emission step by step. As the second battery assembly organization of General Motors in the world, the SAIC General Motors Power Battery System Development Center is in strict compliance with the globally unified production process and technical standards for the battery assembly factory in Brownston, the United States. Mr. Qian Huikang, Global Executive Vice President of General Motors and President of General Motors China, said that China is crucial to realizing the vision of "zero emissions".

Safety, reliability and durability: self-cultivation of high standard automobile power battery

Uncle Long has begun to be impatient with Buick VELITE6.

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