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In addition to the acupuncture test, what other power lithium battery test items do you know?

In March 2020, the blade battery is widely known for conquering acupuncture tests, and the safety of power lithium-ion batteries has also attracted attention. Many consumers want to learn more about the safety of blade batteries. In addition to the needle prick test, what tests have the blade batteries undergone? How did it perform? Let's find out.

Squeeze test to ensure life safety in collision accidents

The squeeze test is an indispensable and important item for power lithium-ion battery testing. It can simulate a car crash and the power lithium-ion battery is squeezed and deformed to test the safety performance of the power lithium-ion battery. The requirements of the national standard for extrusion testing are relatively strict: the power lithium-ion battery deforms up to 30%, and within one hour, no fire or explosion can occur.

In the squeeze test, the blade battery did not catch fire or explode when it was deformed by 30% and left for one hour. In a traffic accident, there is no explosion or fire, which can ensure that the owner is protected from secondary injury, and also protect the life and property of the owner to the greatest extent. This is BYD's safety requirements for power lithium-ion batteries.

Furnace temperature test   baking test power lithium ion battery high temperature safety barrier

Furnace temperature test, also called heating test, is mainly used to test the safety performance of power lithium-ion battery under high temperature conditions. The national standard requires that the power lithium-ion battery be heated to 130°C by continuous heating and kept at the temperature for 30 minutes. During this period, the power lithium-ion battery must not catch fire or explode.

The blade battery uses lithium iron phosphate material, which has better high temperature resistance. In the furnace temperature test, the blade battery was kept for 30 minutes at a temperature of more than twice the national standard requirement and reached a high temperature of 300°, and there was no fire or explosion during the period. When encountering situations such as fires of adjacent vehicles in the parking lot, the super high temperature resistance of the blade battery can allow new energy vehicles to maximize battery safety in high temperature environments.

Overcharge test   special protection against charging system failure

Overcharging is one of the important culprits of spontaneous combustion accidents of new energy vehicles. Due to the failure of the charging system, the battery continues to be charged when it is fully charged, which leads to overcharging, which in turn triggers the spontaneous combustion of new energy vehicles.

The stronger the anti-overcharge ability of the power lithium-ion battery, the lower the chance of spontaneous combustion of the vehicle. The overcharge test can simulate the battery's overcharge condition and detect the battery's ability to prevent thermal runaway. The national standard requires that the charging should be terminated when the current is charged at a constant current of 1 times to 1.5 times the termination voltage, and no fire or explosion should occur after one hour of observation.

In the overcharge test, the BYD blade battery was charged to 2.6 times the termination voltage at a current rate of 1 and the charging was terminated, and there was no fire or explosion during the 1-hour observation period. With a higher anti-overcharge standard to reduce the probability of spontaneous combustion caused by overcharge, the blade battery improves the safety performance of new energy vehicles.

Force the battery core to run out of control and the whole package is still sitting around

Thermal runaway is the fuse that triggers the spontaneous combustion of power lithium-ion batteries. In order to detect the safety performance of the blade battery in the case of thermal runaway, BYD conducts a forced thermal runaway test on the blade battery, which artificially causes a battery cell in the battery pack to experience thermal runaway , Observe the safety performance of the entire battery pack.

The forced thermal runaway of the battery cell, with the cooperation of the blade battery's self-insulation and flame retardant system, did not cause the thermal runaway of the adjacent battery cell. The highest temperature of the next battery cell is 80°C, which does not reach the temperature condition of thermal runaway of the lithium iron phosphate battery. The thermal runaway of a single cell does not cause a chain reaction of adjacent cells, so the safety performance of the entire battery pack remains the same.

After rigorous testing, the overall safety performance of the blade battery has been fully verified, and the truly safe new energy vehicles are delivered to consumers. The emergence of blade batteries has made the performance advantages of new energy vehicles more obvious, replacing fuel vehicles and promoting green travel will become an irreversible historical trend.

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