Is the 26650 lithium ion battery safe?

The 26650 lithium ion battery is a model specification of the cylindrical lithium ion battery. Type 26650 refers to a cylindrical battery with a diameter of 26mm and a length of 65mm. Used in the fields of electric tools, lighting, wind energy storage, electric vehicles, toys, instrumentation, UPS backup power supply, communication equipment, medical equipment and military lights. The safety performance test methods of 26650 lithium-ion battery are as follows: 1. Overcharge performance After standard charging of 26650 lithium-ion battery, measure the initial state of the battery. When the battery state is normal, charge to 10.0V with 3C current, and then transfer to constant voltage charging until the end It ends when the current is 0.01C. Observe the change in the appearance of the battery. Result: no fire, no explosion 2, over-discharge performance After standard charging of 26650 lithium ion battery, the initial state of the battery was measured. When the battery state is normal, discharge to 0V at 0.5C. Observe the changes in the appearance of the battery. Result: no fire, no explosion 3, external short circuit After standard charging of 26650 lithium ion battery, measure the initial state of the battery, and directly short-circuit its positive and negative poles in the explosion-proof cover (the total resistance of the circuit is not more than 50m), when the battery temperature drops to The test ends when the temperature is about 10°C lower than the peak temperature. Observe the temperature and appearance changes of the battery. Result: no fire, no explosion. 4. Thermal abuse. Measure the initial state of 26650 lithium-ion battery. After the battery is standard charged, it is placed in an oven, and the temperature rises to 130±2°C at a rate of (5±2°C)/min and keeps warm. 30min. Observe the changes in the appearance of the battery. Result: no fire, no explosion 5. Drop test the initial capacity of the 26650 lithium-ion battery. After standard charging, measure the initial state of the battery, and drop the test battery from a position with a height of 1m (the lowest point) to a vertical and horizontal direction. On the concrete floor, 2 drops are required. Result: no fire, no explosion 6. Heavy object impact Place a steel rod with a diameter of 15.8mm in the middle of a fully charged battery; then a hammer with a weight of 10Kg freely falls from a height of 1.0m to the upper part of the battery. Result: no fire, no explosion 7. The extrusion test cell is placed between the two extrusion surfaces of the extrusion equipment, the cylindrical cell axis is parallel to the extrusion surface, and the pressure is gradually increased to 13kN, and the pressure is maintained for 1 min. Result: No fire, no explosion. Statement: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.