March 2020 Blade batteries are widely known for conquering the pinprick test, and the safety of power batteries is thus a major concern. Many consumers want to know more about the safety of blade batteries. In addition to the pinprick test, what other tests have blade batteries undergone? How does it perform? Let's find out.
Crush test to ensure the safety of life in a collision
Extrusion test is an important item indispensable for power battery testing, which can simulate the collision of the car, power battery extrusion deformation, to test the safety performance of the power battery. National standards for extrusion test requirements are relatively harsh: power battery in the deformation of up to 30%, and within an hour, can not occur in the fire, explosion phenomenon.
Extrusion test, the blade battery in the process of deformation up to 30% and placed in an hour did not occur fire, explosion. In the traffic accident does not explode, no fire, can ensure that the owner from secondary injury, but also in the maximum protection of the owner's life, property safety, which is BYD's safety requirements for the power battery.
Furnace temperature test to test the power battery high temperature safety barrier
The oven temperature test, also known as the heating test, is mainly used to test the safety performance of the power battery under high temperature conditions. The national standard requires continuous heating of the power battery to 130°C and maintain the temperature for 30 minutes, during which the power battery cannot catch fire or explode.
The blade battery uses lithium iron phosphate material, which has better performance in high temperature resistance. In the furnace temperature test, the blade battery in more than two times the national standard temperature requirements, reaching 300 ° high temperature to maintain 30 minutes, during which no fire or explosion and other phenomena. When encountering the situation of adjacent vehicles in the parking lot catching fire, the super high temperature resistance of the blade battery enables the new energy vehicles to ensure maximum battery safety under high temperature environment.
Overcharge test to prevent charging system failure
Overcharging is one of the main culprits of spontaneous combustion accidents in new energy vehicles. Due to the failure of the charging system, the battery continues to charge when fully charged, resulting in overcharging, which then leads to spontaneous combustion of the new energy vehicle has occurred in a number of incidents.
The stronger the power battery's ability to prevent overcharging, the lower the chance of spontaneous combustion of the vehicle. The overcharge test can simulate the battery overcharge situation and test the battery's ability to prevent thermal runaway. The national standard requires charging at a constant current of 1x rate to 1.5 times the termination voltage when the charge is terminated, and the observation of one hour shall not appear fire, explosion phenomenon.
In the overcharge test, the BYD blade battery was charged to 2.6 times the termination voltage at a rate of 1, and no fire or explosion occurred during the one-hour observation period. With a higher standard of overcharge prevention to reduce the chance of spontaneous combustion caused by overcharging, the blade battery makes the safety performance of new energy vehicles to a higher level.
Forced thermal runaway of the battery cell whole pack still sits unharmed
Thermal runaway is the trigger for spontaneous combustion of the power battery. In order to test the safety performance of the blade battery in the case of thermal runaway, BYD conducts a forced thermal runaway test on the blade battery, artificially causing thermal runaway of a battery unit in the battery pack to observe the safety performance of the whole pack.
The forced thermal runaway of the battery cell, with the cooperation of the blade battery self-insulation and flame retardant system, did not cause thermal runaway of the adjacent battery cell. The maximum temperature of the adjacent cell was 80°C, which did not reach the temperature conditions of thermal runaway of lithium iron phosphate batteries. The thermal runaway of a single cell did not trigger a chain reaction of adjacent cells, so the safety performance of the whole pack of batteries remains the same.
