Lithium batteries can explode when charged.
Lithium battery explosions usually occur during the charging process, because the negative electrode material of lithium batteries is graphite or other carbon materials. During the charging process, the positive electrode material releases lithium ions into. carbon, forming intercalation compounds, is chemically very unstable.
Not all batteries that enter thermal runaway will explode. Cell phones, laptops, etc. use small lithium batteries, which dissipate heat easily, and the risk of explosion is about one in ten million.
The fundamental cause of safety accidents such as explosions and combustions in lithium batteries is that the temperature inside the battery rises too quickly or the pressureon internal is too high. However, the explosion of the battery depends on the condition of the battery. load, heat transfer rate and opening of the safety valve. It is linked to many factors such as sensitivity and external ambient temperature.
Methods for solving lithium battery safety issues:
Safety can be improved by optimizing the structure and design of lithium batteries. For example, choose cathode materials with high thermal stability, flame-retardant electrolytes, negative electrode materials that do not precipitate lithium, and high-performance separators.
In fact, the academic community already has a solution to the lithium battery safety problem, but it is still in the theoretical stage and is still far from being applied. Nowadays, heat-sensitive materials are manufactured at home and abroad. In dUnder normal circumstances, heat-sensitive materials are conductors or semiconductors. When the battery temperature is too high, heat-sensitive materials become insulators and interrupt the battery's reaction.
In addition, there is also the research and development of electrolyte blockers. However, these solutions will more or less affect the battery's energy density, service life, high temperature resistance and other properties in actual operation.
Reference for the content above? People's Daily Online - Don't let lithium batteries become "bombs"
Lithium batteries can burn, explode and cause other safety accidents under certain conditions. circumstances. This is mainly due to the following reasons:
1. Overcharge and discharge: If the lithium battery is overcharged or discharged, it will cause polarizationinside the battery, will generate gas, heat, etc., thereby increasing the internal pressure of the battery. It can even cause problems such as a short circuit.
2. High temperature environment: High temperature environment will accelerate the chemical reaction inside the lithium battery and increase the internal pressure and heat of the battery, causing it to explode.
3. Mechanical damage: If the lithium battery is mechanically damaged, such as extrusion, puncture, etc., it will cause the positive and negative electrodes inside the battery to short circuit, causing danger.
4. Low temperature environment: In extremely low temperature environments, the performance and capacity of the battery will be affected, which may cause the battery to leak, resulting in dangers such as combustion and explosion.
Consequently, in order toavoid lithium battery safety accidents, it is necessary to pay attention to the reasonable use and storage of batteries, avoid excessive charging and discharging, avoid using batteries in environments with high or low temperature, and avoid mechanical damage. If the lithium battery is abnormal or damaged, it should be placed in a safe place in time and handled in accordance with relevant regulations. At the same time, when purchasing lithium batteries, you should also choose legalbranded and certified products and follow the corresponding instructions for use.