What testing and certification do lithium batteries generally need to do?

Lithium battery testing and certification, the battery capital found that the most complete lithium battery testing and certification is basically these, as shown in the figure below.

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1.Cycle life.

The number of cycles of 3C lithium battery reflects how many times the battery can be charged and discharged repeatedly. According to the different environments in which 3C lithium batteries are used, the cycle life can test how much the cycle life of the battery can reach at low temperature, room temperature and high temperature.

2.Magnification. At the moment when the pace of life is fast, the requirements for fast charging of 3C lithium batteries are getting higher and higher. Therefore, it is necessary to test the rate performance of 3C lithium battery.

3.High and low temperature discharge test.

In the high and low temperature test environment, the 3C lithium battery is charged and discharged test, and the curve and data are retained at the end of the charge and discharge cycle. Compare the curves and data at room temperature to see if they meet the specifications as stated.

4.Security testing.

The safety test of 3C lithium battery includes overcharge, overdischarge, short circuit, drop, heating, vibration, extrusion, acupuncture, etc., so that foreign objects can actively destroy the battery to test the safety of the battery.

There are many certifications to be done for lithium batteries: CE certification, RoHS certification, certification, IEC62133, REACH certification, MSDS report, generally professional battery manufacturers will do these certifications, if you have any questions or needs in this regard, you can contact me, happy to answer for you, hope to adopt.

The state has only one mandatory testing and certification requirement for lithium battery assembly, and the battery is legally compliant and circulated in the market after processing, otherwise it is a three-no product.

1. Voltage measurement method.

In other words, the battery power is obtained by simply monitoring the voltage of the battery. Advantages of this method: simple disadvantages:

Not accurate, the accuracy of the electricity measurement is only more than 20%. Especially when the battery level is less than 50%, the phone's battery calculation will become very inaccurate. So the protection of the battery with this method is very limited.

2. Battery modeling method.

This method is to create a data sheet based on the discharge curve of the battery, and the data sheet will indicate the amount of power at different voltages. Advantages: It is more accurate than the voltage test method, and the disadvantages:

Obtaining an accurate data sheet is not simple, because the relationship between voltage and power also involves factors such as battery temperature, self-discharge, aging, etc.

Early R&D of lithium batteries.

Lithium batteries were the first to be used in pacemakers. The self-discharge rate of lithium batteries is extremely low, and the discharge voltage is gentle, so that the pacemaker implanted in the human body can operate for a long time without recharging. Lithium batteries generally have a nominal voltage higher than volts, which is more suitable for integrated circuit power supply.

Manganese dioxide batteries are widely used in calculators, digital cameras, and watches.

In order to develop varieties with better performance, various materials are being researched to create products that have never been seen before.

In 1992, Sony successfully developed lithium-ion batteries. Its practical application has greatly reduced the weight and volume of portable electronic devices such as mobile **, notebooks, and calculators.

GB T18287 Cycle Life Test Standard for Lithium Batteries, IEC stipulates that the standard cycle life test for lithium batteries is:

After the battery is discharged, it is charged to a cut-off current of 20mA and then discharged to a cycle). After 500 cycles, the capacity should be more than 60% of the initial capacity.

The IEC stipulates that the standard cycle life test of nickel-cadmium and nickel-metal hydride batteries is: the battery is put to the back.

According to the national standard for lithium batteries: GB T18287-2000, the test items of lithium batteries include appearance, discharge performance, high and low temperature performance, charge retention capacity, and cycle life; Heat-resistant, vibration-resistant, crash-resistant, free-fall resistant environmental adaptability; safety performance of overcharge protection, over-current protection and short-circuit protection; Safety performance of heavy object impact, thermal shock, overcharge and short circuit; storage performance, etc. The following focuses on the test conditions and standards for power liberation performance, high and low temperature performance, cycle life, and overcharge, overdischarge and short-circuit protection.

According to the understanding, lithium battery certification usually refers to the testing and verification of the safety, reliability and other aspects of a single lithium battery cell or battery pack, and Dayuan ensures that it meets the requirements of relevant international standards and regulations. The whole machine certification refers to the testing and verification of the entire electronic product containing lithium batteries to ensure that it will not cause harm to users and the environment during normal use, and meet the requirements of relevant regulations and standards. Therefore, lithium battery certification and complete machine certification are two different certification methods, but usually, lithium batteries used in electronic products need to pass the lithium battery certification that meets the relevant standards before they can be sold and used.

If this bright imitation search lithium battery is a separate **, then it needs to be certified separately for the lithium battery cell or battery pack. If the entire electronic product contains the lithium battery sold, then the whole machine needs to be certified to ensure that the electronic product meets the requirements of relevant standards and regulations, and also contains the certification content of the lithium battery. All in all, lithium battery and whole machine certification are two different certification methods<>

However, in electronic products, lithium batteries usually need to meet the certification requirements of relevant standards, and the certification requirements of lithium batteries are also included in the certification of the whole machine.

Hello, lithium battery certification usually refers to the certification of the battery, not the certification of the whole machine. Depending on the regulations and standards of different countries, manufacturers may need to certify their lithium-ion batteries for safety, performance, and other relevant aspects of keyhole clearing. However, if a lithium battery is installed in a product and the product needs to be certified, then the lithium battery will also be subject to certain certification tests and evaluations.

However, it is important to note that these two certifications are not the same and need to meet different standards and requirements.

In addition to the electrical testing, mechanical testing, thermal testing, and environmental simulation mentioned by the previous students, lithium battery testing also includes material testing, cell testing, and module testing in the manufacturing process.

**From industrial CT testing expert Lima Precision Measurement.

With specific components or targets for battery testing, the banquet code includes electrode piece quality inspection, welding quality inspection, coating glue quality inspection, foreign body gas production and leakage and other defect detection, as well as geometric measurement of battery structure and defect distribution.

Electrical test: overcharge, overdischarge, external short circuit, forced discharge, insulation ridge impedance, surface resistivity test, dielectric strength, breakdown voltage test, dielectric strength, internal resistance test, self-discharge rate, cycle life, sealing performance, storage performance, solderability, corrosion resistance, storage characteristics, etc.

Mechanical test: extrusion, needle penetration, shock, vibration, drop, abrasion resistance, tension, stretching, etc.

Thermal test: high and low temperature cycle, combustion, microwave heating, low temperature, temperature cycle, brittleness, cold cracking temperature, deformation temperature, thermal expansion, flame resistance, etc.

Environmental simulation: high-altitude low pressure simulation, salt spray test, anti-cherry blossom shouting key water rain test, sand and dust test, impregnation, low atmospheric pressure, constant damp heat, alternating damp heat, high pressure cooking, ** resistance, salt spray corrosion, gas corrosion, anti-mold, solar radiation, photoaging, etc.