Electric balance car, also known as somatosensory car, thinking car, camera car, etc. There are mainly two types of single wheel and double wheel on the market. Its operating principle is mainly based on a basic principle called "Dynamic Stabilization".

The gyroscope and acceleration sensor inside the car body are used to detect the change of the car body attitude, and the servo control system is used to accurately drive the motor to make corresponding adjustments to maintain the balance of the system. It is a new type of green and environmentally friendly product that modern people use as a means of transportation, leisure and entertainment. However, after the conscience media in the United States announced that the self-ignition of the self-balancing vehicle caused the house to burn down and many crashes, the quality of the self-balancing vehicle affected the personal safety of consumers, and even caused huge losses to public property. Therefore, the Consumer Product Safety Association (CPSC) announced that all manufacturers, importers and distributors of self-balancing vehicles (including torsion vehicles) whose self-balancing vehicles produced, imported and sold in the United States must meet the UL2272 certification standard before they can be listed on the market. Sales.

So today, the editor of the China Joint Inspection Institute will explain to you the UL2272 certification process and related information for electric balance bikes. Partners who have exported electric balance bikes in the near future can collect them. If you don’t understand anything, you can privately message the editor.

1. UL certification test items for electric balance car:

1. Overcharge Test

2. Short Circuit Test

3. Overdischarge Test

4. Temperature Test (normal temperature rise test)

5. Imbalanced Charging Test

6. Vibration Test

7. Shock Test

8. Crush Test

9. Drop Test

10. Mold Stress Relief Test

11. Motor Overload Test

12. Motor Locked Rotor

13. Water Exposure Tests-IPX4 Code Rating (IPX4 Test)

14. Water Exposure Tests- Partial immersion (immersion test)

15. Thermal Cycling Test

16. Label Permanence Test

2. UL2272 certification electrical performance test:

1. Overcharge (single fault of circuit board);

2. Short circuit (single fault of circuit board)

3. Over-discharge (single fault of circuit board);

4. Temperature test (the temperature meets the temperature requirements of table 261262 components and accessible surfaces);

5. Unbalanced charging (one cell is fully discharged, the other cells are discharged to 50% of their capacity, and charged with the specified charger);

6. Withstand voltage test (this test is only required if the voltage is greater than 60V);

7. Insulation resistance test (this test is only required if the voltage is greater than 60V):

3. UL2272 certified mechanical performance test:

1. Vibration test

The fully charged self-balancing scooter is subjected to the vibration test according to the table below.

When vibrating one sample, vibrate for 21h in each direction When vibrating two samples at the same time, vibrating 15k in each direction When vibrating three samples at the same time, vibrating for 12 hours in each direction After the test, if the balance car can still run, it should be subjected to at least one shock discharge cycle. There is no danger of fire, explosion, shell rupture and electric shock after vibration.

2, punch test

The fully charged balance bike is subjected to the impact test of the balance bike according to the table below, in six directions, with three impacts in each direction. After the test, if the balance car is still operational, it should be subjected to at least one charge-discharge cycle. After the impact, the balance car has no fire, no explosion, no shell rupture, and no danger of electric shock.

3. Extrusion test

This test mainly examines the safety of the whole balance car after being subjected to external extrusion

The fully charged self-balancing scooter is subjected to the extrusion of the extrusion plate with the specifications in the figure below, until the deformation reaches 50% or the squeezing force reaches 1000 times the mass of the balancing car, or the squeezing force reaches 100KN (the first is the largest). The direction of the extrusion force is perpendicular to the movement direction of the balance car. The sample received only one squeeze. After being squeezed, the balance car will not catch fire, explode, and risk of electric shock.

4. Drop test

A fully charged self-balancing scooter can withstand three drops from a height of 1 meter. If the self-balancing scooter is still operable after the drop, it should be tested at least one charge-discharge cycle. There should be no fire, no explosion, no rupture of the shell, and no leakage of electrolyte.

5. Shell oven test

Before the test, the balance car is completely discharged. This test mainly tests whether the thermoplastic shell of the balance car has shrinkage and deformation under high temperature environment. The balance car was placed at a temperature of 7 sinks for 7 hours. Remove the balance car from the high temperature box, and lower the temperature of the balance car to room temperature. Live parts shall not be touched by the test rod (25mm diameter 100mm long) after housing rupture.

6. Motor overload

Start the balance car, first apply the normal load, and then gradually increase the balance car load until overload protection or motor coil disconnection occurs. The balance car motor coil thermometer meets the following requirements.

4. Environmental testing