26650 lithium battery safety performance detection analysis

After standard charging of the battery, measure the initial state of the battery. When the battery state is normal, charge it to 10.0V with a 3C current, and then transfer to constant voltage charging to terminate when the cut-off 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 the battery, the initial state of the battery is measured, and 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. After standard charging of external short-circuit battery, measure the initial state of the battery and place it in an explosion-proof cover to short-circuit its positive and negative electrodes (total resistance of the circuit is not greater than 50m), when the battery temperature drops to the peak temperature The experiment ended when it was about 10°C lower. Observe the temperature and appearance changes of the battery. Result: no fire, no explosion 4. Thermal abuse The initial state of the battery is measured. After the battery is standard charged, it is placed in an oven, and the temperature is increased to 130±2°C at a rate of (5±2°C)/min and kept for 30 minutes. Observe the changes in the appearance of the battery. Result: no fire, no explosion 5. The initial capacity of the drop detection 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 the concrete floor vertically and horizontally. , It is required to fall twice. 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 detection 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. Previous: Equipment required for lithium battery production