watch a battery explode and release jets of molten liquid into the air: thermal images capture what happens when a cell overheats
If the smartphone is close to the body or used for a long time, they usually overheat. And the danger of overheating lithium ion (Li-ion) The battery has been known for a while, and researchers have now revealed exactly what is happening inside the \"burn\" battery. The thermal image shows that the copper inside the battery reaches a temperature of at least 1,085 °C (1,985°F) The material that causes the melting is ejected from the vent. Scroll down for a video recorder to withstand lithium Thermal imaging and non-imaging ion batteries for heating and use Invasive high-speed imaging technology was used to observe the changes in its internal structure. Copper melted internally, indicating a temperature of at least 1,085 °C (1,985°F) It causes the molten material to flow out of the vent (pictured) The lens was Mr. Li\'s first failure- Ion batteries caused by overheating have been recorded. This was filmed by Paul Shearing of University College London, and the findings are published in the journal Nature Communications. Li- Ion batteries are vulnerable to situations called Heat runaway, which occurs when the heat rate is greater than the heat dissipation rate. Although there are few battery failures, preventing thermal runaway poses one of the biggest challenges to the safe operation of lithiumion batteries. Dr. Shearing and his colleagues conducted two business activities. The ion battery known as battery No. 1 and battery No. 2 is heated to the outside world. Then they used thermal imaging and non- Intrusion-type high-speed imaging technology is used to observe the internal structure of each type. Battery 1 remains intact during battery failure and due to heat- Continue to react, and the hot air then squirts molten material through the vent of the battery. The copper material inside the battery No. 1 is melted, indicating that the internal temperature is at least 1,085 °c (1,985°F). In contrast, a rapid increase in pressure in cell 2 results in the entire cap division of the cell. In a real- This can increase heat out of control as it allows oxygen to enter the cells. During the heat out of control, the high temperature in the failed battery can spread to the next battery, causing it to become hot unstable as well. In some cases, a chain reaction occurs where each cell breaks down one-by-one. This means that the battery pack can be destroyed in a few seconds, or that the discharge of gas and heat can last for several hours. As a safety measure, partitions are installed on the package to protect the ineffective cell morphology that affects nearby cells. The authors found that the thermal and electro-chemical reactions inside the two batteries produced a gas bag that distorted the spiral winding layer of the battery. Cell 2 shows that there is a serious internal distortion in its structure, which the author considers to compromise its security. Unlike unit 2, the design of Unit 1 adopts a central cylindrical support, which seems to help maintain its structural integrity. The authors hope that their observations will lead to improvements in the design of Li- Improve the safety performance of ion batteries.