Battery CE certification

CE certification introduction:

The "CE" mark is a compulsory certification mark. Whether it is a product produced by an EU enterprise or a product produced in another country, if you want to circulate freely on the EU market, you must affix the "CE" mark to show that the product conforms to the EU " The basic requirements of the "New Methods of Technical Coordination and Standardization" directive. This is a mandatory requirement of EU law on products. The word CE is abbreviated from the French "Communate Europpene", which means the European Community.

Preliminary preparations for CE certification testing:

Since there was no previous CE certification testing work and lack of CE certification testing experience, in this CE certification test, the preparatory work was not done comprehensively or in place, which led to unsatisfactory progress in the certification testing process and affected the certification testing cycle. Therefore, in order not to affect the test cycle, the preliminary preparations need to be done carefully, and they need to be completed with the joint efforts of the developers. The preliminary preparations for the CE certification test are summarized as follows:

1. Those who need the assistance of developers to prepare are:

(1) Collect the list of key components and the certification materials of key components;

(2) Provide the schematic diagram of each single board of the test prototype;

(3) Provide samples of isolation transformers;

(4) Provide PCB light board;

(5) Provide CE test prototypes.

2. What needs to be prepared by the tester:

(1), can provide Chinese and English user manual, Chinese and English installation manual (must have English user manual);

(2) Submit the CE certification test application and user manual in Chinese and English in the company's reliability area;

(3) It is necessary to prepare a nameplate with CE mark, and the nameplate mark meets the requirements;

(4) The tester needs to pre-test the weak items of the prototype according to the test requirements, and notify the developer in time if there are any unpassed items

Rectification

(5) Check whether the key device list provided by the developer contains all of them, and check whether the certification number of the key device is consistent with the actual

If there are any omissions and inconsistencies, immediately inform the developer to change.

3. Test content

The content of CE certification testing includes EMC testing and safety testing. Usually, EMC testing is carried out first, and safety testing is carried out after the test is passed. After the two tests are completed, the safety tester will provide the CE certification certificate.

EMC test:

The items to be tested for EMC testing include: conducted disturbance test, radiated disturbance test, electrostatic discharge immunity test, conducted immunity test, radio frequency electromagnetic field radiation immunity test, electrical fast transient pulse group immunity test, voltage transient Test contents such as drop and short-term interruption immunity test, input current harmonic test, surge immunity test, power frequency magnetic field immunity test, etc.

Safety test:

Safety testing is the focus of CE certification testing, and it is also difficult to test. There are many test contents. The requirements for safety regulations are similar to those specified in the GB4943 standard. The test contents are as follows:

1. Nameplate and label permanent test:

 Test method: Wipe the label with a cloth soaked in soapy water or gasoline for 15 seconds before checking the nameplate and label.

 Judgment criteria: the nameplate and label shall not fall off, the corners shall not be rolled, and the writing shall be clear.

2. Input current test:

 Test method: Test the maximum input current of the prototype in the mains mode, both at full load and under low voltage and heavy load.

 Judgment criterion: It is required to be no more than 110% of the nominal input current value.

3. Capacitor discharge test of the main circuit:

 Test method: Use an oscilloscope and a high-voltage probe to test the voltage of the capacitor, disconnect the input voltage at the peak of the highest input voltage, and use the oscilloscope to measure the time when the voltage drops from the highest value to a safe voltage. If available, set a fixed phase interruption. The AC SOURCE for electricity is the best. If not, it can only be repeated many times until the power off phase is 90 degrees or 270 degrees.

Judgment criterion: Within a time constant (<1s), the voltage should drop below 37% of the input voltage.

Note: There is no need to test when the capacitance value of X capacitor is less than 0.1µF.

4. Protected ground test:

testing method:

1) Apply DC voltage at both ends of the output ground and input ground, and string the ammeter into the line at the same time. Start the DC voltage from 0 and gradually increase, so that the current of the ammeter gradually reaches 25 amperes, keep it for 1 minute, and then according to the voltage and current value Calculate the resistance value of output ground and input ground;

2) Apply a DC voltage to both ends of the metal casing and the input ground, and at the same time string the ammeter into the line, start the DC voltage from 0 and gradually increase, so that the current of the ammeter gradually reaches 25 amperes, keep it for 1 minute, and then according to the voltage and current value Calculate the resistance value of output ground and input ground;

3) Apply a DC voltage to both the ground wire and the input ground on the PCB board, and at the same time string the ammeter into the circuit. Start the DC voltage from 0 and gradually increase so that the current of the ammeter gradually reaches 25 amperes and keep it for 1 minute. Calculate the resistance value of output ground and input ground by voltage and current value;

Judgment criterion: The voltage drop on the protective connecting conductor is not more than 2.5V, that is, the grounding resistance is less than 0.1Ω.

5. Compressive strength test:

Test method: Before the test, put the prototype in a 20-30C, 91-95%RH environment and store it for 48h, and then perform the following withstand voltage test.

1) Between the input line and the communication serial port, use a withstand voltage tester and set the voltage DC to 4242V

2) Input the zero live wire to the ground, use a withstand voltage tester, set the voltage DC to 2121V

3) Output the zero live wire to the ground, use a withstand voltage tester, set the voltage DC to 2121V

4) The primary and secondary sides of the isolation transformer are tested with a withstand voltage tester, and the set voltage AC is 3000V

Judgment criterion: There should be no insulation breakdown during the pressure strength test.

6. Single point failure test:

Test method: Select the key components on each board separately, make these components short-circuit or open the circuit before or after the power-on, observe and record whether the prototype is damaged, and which other components are damaged. Each component is tested separately for a single point of failure. As for how to select the right single point, it is necessary to have a relatively familiar understanding of the schematic diagram, components, European standards and other related materials to be able to do it. These are also a long-term process accumulated in actual work.

Judgment criteria: no fire, no damage to the insulation device, no splashes of molten metal liquid; it must pass the electrical strength test.

7. Temperature rise test of key components:

Test method: select the main board, power board, auxiliary power board, charger board and other key components, and use a temperature riser to test the temperature of these components under full load and different input voltages. These components mainly include: capacitors, switching tubes, inductors, radiators, switches, wires, relays, transformers, batteries, PCBs.

Judgment standard: not greater than the nominal temperature of the component.

8. Leakage current test: the prototype is normal, and the input voltage is the maximum input voltage

1) Use a leakage current tester to test the leakage current of the input neutral line to the communication port

2) Use a leakage current tester to test the leakage current of the input live wire to the communication port

3) Use a leakage current tester to test the leakage current of the input neutral line to the metal shell

4) Use a leakage current tester to test the leakage current of the input live wire to the metal shell

5) Use a leakage current tester to test the leakage current of the input neutral wire to the plastic panel

6) Use a leakage current tester to test the leakage current of the input live wire to the plastic panel

Judgment standard: Need to meet Class I: <3.5mA

9. Electrical clearance and creepage distance measurement test:

Test method: first measure the working voltage values of the primary and secondary sides, and then check whether the following safety distances meet the requirements according to the effective value of the input voltage and the working voltage according to the GB4943 table look-up method:

1) Measure the creepage distance and electrical clearance of the circuit to the chassis (protective ground) at one time.

2) Creepage distance and electrical clearance between the primary test circuit and the secondary test safety circuit.

Judgment standard: The safety distance specified in the GB4943 standard is used as the standard.