Introduce the knowledge of lithium-ion battery safety performance testing

Reveal the safety test of lithium-ion batteries. There are two options for the overcharge test of rechargeable lithium-ion batteries: 1) Lithium-ion batteries are in an explosion-proof box at room temperature (20+5) ℃, 3Ⅳ charging current, when the battery voltage is 5V or the charging time is 90 minutes (It is best to test in a stop condition). 2) 9IV charging current, when the lithium-ion battery voltage reaches 10V, the test will stop. When the specified voltage is reached, the lithium-ion battery should not explode or catch fire, as shown in Figure 1. The lithium ion battery did not explode or catch fire. This test is to evaluate the charging of lithium-ion batteries in electric vehicles. When the charging device is out of control or human accident occurs. Cause high current overcharge. The safety performance of lithium-ion batteries in this state. Drop test lithium ion battery (20+5)℃. From a height of 1.5 meters, it fell from south to south to a 20mm thick hardwood floor. 1 time per side (the battery referred to here is a rectangular parallelepiped. It will undergo 6 drops of test. Lithium-ion batteries should not explode, should not catch fire, and should not leak. The test results show that there is a drain in the battery. This means that The battery box is too weak. This batch of batteries is unqualified. The squeeze test puts the lithium-ion battery in the squeeze chamber. The direction perpendicular to the battery plate and the extrusion area should not be less than 20cmz. The test is destructive. In the test During the process, the lithium-ion battery should not explode or catch fire. See Figure 3. The results show. After testing, the battery did not explode or catch fire. But there is smoke. Short circuit test lithium-ion battery explosion-proof box at room temperature (20_+5) ℃ In the test, the lithium ion battery passes through an external short circuit, and the external circuit resistance should be less than 5mQ. During the test, the lithium ion battery should not explode or catch fire. Pass the experiment. The battery does not explode or catch fire. See Figure 1. This test is to evaluate lithium The performance of ion batteries in normal use or accidents. The positive and negative electrodes of the battery may be short-circuited, and the battery will have a large current. At this time, the internal protection circuit of the battery should work, and the electrode should be disconnected. Ensure that the battery will not explode or catch fire. A discharged lithium The ion battery is in an explosion-proof box at room temperature (20+5). With 1Ⅳ discharge current, until the battery voltage is 0V (if there is an electronic protection circuit. The discharge electronic protection line should be temporarily removed. Lithium ion batteries should not explode, catch fire, or The leakage is shown in Figure 1. The purpose of the test is to test when the electric vehicle exceeds the required range of battery capacity. The safety performance of the lithium-ion battery under the extreme discharge state. The heating test places the lithium-ion battery at (8+52) ℃ In the thermostat. Keep the temperature for 120 minutes. During the test, the lithium-ion battery should not explode or catch fire. In the southern part of our country. The temperature in summer is as high as 40°C. The electric vehicle runs in the sun for a long time. The power lithium battery is placed in Closed space. The working environment temperature can reach above 60℃. If the lithium ion battery cannot withstand the test used in a high temperature environment, there will be explosions and fires. This test is to test the safety performance of the power lithium battery in a high temperature environment. New How long does it take for a secondary battery to be fully charged? A battery made of three-dimensional nanostructures functions as a capacitor, but has a larger capacity. When current passes, the electrodes of the capacitor will form an electromagnetic field. Although this electromagnetic field can store electricity for later Release, but the capacity of capacitors is very limited. Most capacitors can only store a small amount of electrical energy, but the release speed is very fast. Batteries can store a lot of energy, but they release and absorb very slowly. Made of new three-dimensional nanostructures The battery has both. The three-dimensional nanostructure allows the battery to be charged quickly within a few minutes. This result will greatly shorten the charging time of electric cars, mobile phones and laptops. The researchers say that in addition to being able to charge faster, this battery It also has greater power storage capacity. These two features are essential to the use of electric vehicles, medical and military equipment, and lasers. Disclaimer: Some pictures and content of articles published on this site are from the Internet. Please contact us if there is any infringement. Delete Previous post: What damage will happen during battery installation?