26650 battery

Overcharge performance

After the standard charging of the battery, measure the initial state of the battery. When the battery is in normal state, charge it with a current of 3C to 10.0V, and then switch to constant voltage charging until the cut-off current is 0.01C. Observe the appearance of the battery for changes.

Result: no fire, no explosion

Over-discharge performance

After standard charging of the battery, measure the initial state of the battery. When the battery is in normal state, discharge it at 0.5C to 0 V. Observe the appearance change of the battery.

Result: no fire, no explosion

external short circuit

After standard charging of the battery, measure the initial state of the battery, place it in an explosion-proof cover and directly short-circuit its positive and negative electrodes (the total resistance of the circuit is not greater than 50mΩ), and the test ends when the battery temperature drops to about 10°C lower than the peak temperature. Observe the temperature and appearance changes of the battery.

Result: no fire, no explosion

hot abuse

Measure the initial state of the battery. After the battery is charged standardly, it is placed in an oven, and the temperature is raised to 130±2°C at a rate of (5±2°C)/min and kept for 30 minutes. Observe the appearance change of the battery.

Result: no fire, no explosion

fall

Test the initial capacity of the battery. After standard charging, measure the initial state of the battery. Drop the test battery from a height (lowest point height) of 1m to the concrete floor in a vertical and horizontal direction, and drop it twice.

Result: no fire, no explosion

heavy impact

Place a steel rod with a diameter of 15.8mm in the middle of the fully charged battery; then drop a hammer weighing 10Kg from a height of 1.0m to the upper part of the battery.

Result: no fire, no explosion

squeeze test

The cell is placed between the two extrusion surfaces of the extrusion equipment, the axis of the cylindrical cell is parallel to the extrusion surface, gradually increase the pressure to 13kN, and keep the pressure for 1min.

Result: no fire, no explosion