Lithium battery detection method, electric vehicle lithium battery detection standard

　　Author ：Iflowpower – Portable Power Station Supplier

Lithium ion battery detection method, electric vehicle lithium ion battery detection standard. Lithium-ion batteries are a high quality, high-security product, consumers often do not know the performance of the battery, resulting in the efficiency of the battery in use often does not meet the ideal goals, and sometimes even blind use can also cause battery explosions. The occurrence of incident, life safety will also be damaged.

In the past two years, the safety accident of electric vehicles has triggered the extensive attention of society and the government, in which the quality and safety focused on lithium-ion batteries, and their battery standards are an important part of quality control. So how do you detect lithium-ion batteries, what is the electric vehicle lithium-ion battery testing standard? Lithium-ion battery detection method Lithium ion battery performance test Important includes voltage, internal resistance, capacity, internal pressure, self-discharge ratio, cycle life, sealing performance, safety performance, storage performance, appearance, etc., there are still over, overlapping, Weldability, corrosion resistance, etc.

Tool: Tester, hard bat, nail. Method: Method 1. 2C discharged to 1.

0V. 1C charge 80 minutes, put it on stand for 15 minutes, discharged from 10V to 10V, and the discharge capacity C1 is measured, and then the battery is charged 80 minutes, and the 1C capacity C2, C2 / C1 ¡Á 100% should be less than 15% lithium after standing for 24 hours. The self-discharge test of the ion battery is: generally use 24-hour self-discharge to quickly test its charge retention, and use the battery in 0.

2C discharged to 3. 0V, constant current constant pressure 1C charge to 4. 2V, cutoff current: 10mA, after 15 minutes, discharged to 3.

0V to measure the discharge capacity C1, charge the battery constant current constant pressure 1c to 4. 2V, cutoff current is 100mA, set up 24 hours after test 1C capacity C2, C2 / C1 ¡Á 100% should be greater than 99%. Method 2, internal resistance measurement battery internal resistance means that the battery is in operation, the current flows through the internal resistance of the battery, which is generally divided into an AC internal resistance and DC internal resistance.

Since the internal resistance of the charging battery is small, the stream internal resistance is measured. Due to the polarization of the electrode, the polarized internal resistance is displayed, and its true value cannot be measured; and the influence of its communication internal resistance is exempted from polarized internal resistance, and the real internal value is obtained. The AC internal resistance test method is: using a battery equivalent to an active resistance, a series of processing such as 1000 Hz, 50mA, and a series of processing such as voltage sampling rectifier filtering, etc.

, to accurately measure the resistance. Method 3, the drop test fell from three different directions from three different directions from three different directions, 2 times in each direction, battery power should be normal, and the outer packaging is not broken. Way 4, hit the experimental battery, will be 15.

8mm diameter hard rods are placed on the battery, with a 20-pound weight from 610 mm height, in hard bars, the battery should not explode fire or leakage. Method 5. After the puncture experimental battery is fully charged, use a diameter of 2.

The nails of 0mm ~ 25mm pass through the center of the battery, and leave the nail in the battery, the battery should not explode. Electric vehicle lithium-ion battery testing standards have always been actively developing a strong international standard for lithium-ion battery safety requirements. In December 2014, my country's Standardization Management Committee announced the No.

27 international standard notice, formally promulgated GB / 31241-2014 "Lithium-ion battery and battery pack safety requirements for portable electronic products". As can be seen from the standard code GB, the standard is a national mandatory standard, and the standard will be officially implemented on August 1, 2015. According to GB / 31241-2014 "Lithium-ion battery and battery pack safety requirements for portable electronic products", there is a lithium-ion battery and battery pack, which is used in accordance with mobile electronic products that do not exceed 18kg.

Mandatory requirements given by performing standards. Standard applicable portable electronic products include, but are not limited to, portable office products such as laptops, PDAs, mobile communication products such as mobile phones, cordless phones, Bluetooth headsets, walkie-talkie, portable audio and video products such as portable TV, portable DVD player, MP3 Players, cameras, camera recordings, etc., and other portable products such as electronic navigators, digital photo frames, game consoles, e-books, mobile power, etc.

According to the standard original, "the portable electronic products listed above did not include all products, so the products not listed were not necessarily within the scope of this standard", that is, the future wearable electronics used lithium Ion batteries and battery packs may also meet the requirements of this standard. The newly promulgated national mandatory standards, in addition to comprehensively adopting a number of domestic and foreign battery standards (such as UL, UN, IEC, etc.), also on thermal abuse, external short circuit, drop, overcharge and other test projects Modification is improved, and supplemented the protection circuit, identify durability, etc.

Safety standard. This also makes this standard initiative to trigger the industry's great concern. Electric vehicle charging consideration 1 Inferior charger or charger that does not match the original battery, it is easy to initiate electrical failure; These materials are fast, and there are a large amount of poisonous flue gas; 6, some individual households that do not have production conditions privately equipped with electric vehicle sales, freely select line and battery, plus unreasonable assembly process, lack quality control.

As the consumer electronics market continues to be hot, the development of the lithium-ion battery market is rapid, not only the scope and number of applications are expanding, but the energy of single battery is getting higher and higher. The continuous exploding lithium-ion battery safety accident also makes people pay more and more attention to the safety of lithium-ion batteries. We understand the detection methods and testing standards of lithium-ion batteries, not only to extend battery life, but also protect our personal safet.