Easy Car News? On September 23rd, Great Wall Motor announced more technical information of Dayu battery to the outside world through activities. As the next generation power battery of Great Wall Motor, Dayu Battery was released at the 8th Great Wall Science and Technology Festival this year, and the technology will be fully applied in 222, and it will be carried on the first model of Salon brand for the first time.
At the end of June, 221, Great Wall Science and Technology Festival
Based on the current development goal of energy saving and emission reduction, electric vehicles have become the development trend of the industry, and consumers also have a greater demand for them. Safety is a major factor affecting consumers' car purchase. In order to solve the problem of thermal runaway of ternary battery, Dayu battery adopts the design concept of "changing blockage into sparse", including "heat source isolation, bidirectional commutation, heat flow distribution, directional explosion removal, high temperature insulation, automatic fire extinguishing, positive pressure oxygen blocking, intelligent cooling", mainly covering the fields of heat source suppression, isolation, cooling and discharge.
in the technical principle of "control+conduction = conduction" of Dayu battery, control refers to thermal insulation of battery core, module-level insulation and comparison of thermal insulation materials, and conduction refers to fire-retardant design of fire-extinguishing box and directional explosion discharge of PACK. Finally, explosion discharge, cooling and heat conduction are realized through four aspects: directional explosion discharge flow field, temperature field, fire-retardant box and conduction heat transfer, and the gas-fire flow is safely guided out of the battery package according to the designed channel to solve the problem of fire and explosion caused by thermal runaway.
the technical advantage of Dayu battery is that it can realize "full coverage of battery cell chemical system", "batteries at any position" and "single or multiple batteries", and the whole package will not catch fire or explode when the trigger heat is out of control. According to the needs of different vehicle types, the R&D team of Great Wall Motor is carrying out diversified applications of Dayu battery technology for batteries with various chemical systems such as medium nickel, high nickel, cobalt-free and lithium iron.
At the same time, Great Wall Motor also conducted a strict thermal runaway test on Dayu battery, according to the test standard: GB 3831-22? "Safety Requirements for Power Batteries for Electric Vehicles" selects ternary 811 system high-nickel large-capacity batteries, and tests them by heating trigger. During the test, two batteries are triggered continuously, and the middle battery of the module is selected as the trigger position.
during the test, the thermal runaway was triggered by the accumulation of multiple batteries for three consecutive times, and the highest temperature reached 137℃. The air pressure in the battery pack reached three peaks, and the instantaneous maximum air pressure was about 16kPa. The maximum temperature to prevent the smoke from overflowing from the battery pack was below 1℃ through the fire extinguishing system, so as to avoid secondary damage to the surrounding area.
in addition to Dayu battery itself, Great Wall Motor has also brought a pioneering full-package thermal runaway combustion model, which can realize multi-dimensional fitting simulation of airflow and fire flow, avoid the traditional way of developing and testing first in the field of thermal runaway, better grasp the safety design results of batteries, and shorten the development cycle and risk.
at present, the practical application of Dayu battery is not far away. As the next generation of brand-new power battery technology, Dayu battery technology is planned to be fully applied in 222, and the first project is the first model of Sharon brand. Salon is a high-end brand of new energy vehicles under Great Wall Motor, and will soon come to the public in the future.
At the end of June, 221, Great Wall Science and Technology Festival
It is noteworthy that Great Wall Motor announced that dozens of patents of Dayu battery technology will be open to the whole society free of charge to promote the development of new energy vehicles.