In 2022, almost all mobile electronic devices will have lithium batteries. If you often walk by the river, you can't keep your shoes wet. Normal people will definitely encounter several battery bulges in their lifetime. In order to commemorate the war damage of the first sound version of the battery pack, today we will introduce a simple science popularization of lithium battery packs.

[Direct cause of bulge]: the lithium ions piled up on the negative electrode grow into dendrite crystals (usually caused by overcharging), and excessive discharge may also lead to collapse of the negative electrode material, resulting in bulge, or the diaphragm reacts with the moisture in the air after being damaged;

[Suggestion]: Avoid overcharging and excessive battery temperature. The night charging habit of charging until dawn, or scenes such as exposure to the sun, high current charging and discharging, charging while playing, and excessive running of the original spirit will have a great impact on the battery. In addition, in hot weather, do not keep the power bank and mobile phone in the car.

[Processing method]: hand over to professionals for processing. If experienced, use solvents such as high concentration isopropanol or acetone (which may damage plastic parts) to dissolve the adhesive and take out the battery to avoid bending, impact and puncture. In case of fire, use a fire extinguisher or sand instead of water.

Arbitrary disposal of lithium batteries will pose a threat to environmental sanitation personnel and affect the environment. However, most regions in China do not have a professional way to recycle lithium batteries. You can go to a nearby mobile phone store or repair shop to ask for solutions.

Extracurricular knowledge

In the "explosion gate" of Samsung Galaxy Note7 in 2016, the causes of the first batch of batteries that caught fire were different from those of the subsequent explosion accidents. The former was due to the extrusion of the negative pole of the battery, resulting in a short circuit, while the latter was due to the burr of ultrasonic welding, which broke the battery, resulting in a short circuit.

Source @ Wang Xiao Clark

The shell of the flexible battery is aluminum plastic packaging, and the internal gases are mainly low boiling hydrocarbons, esters, ethers and carbon dioxide, which are generally generated by the oxidation of electrolyte by free radicals. According to the battery type, the battery electrolyte may include ether, lithium hexafluorophosphate, EC vinyl carbonate, DEC diethyl carbonate, etc.

These gases generally smell "sweet" and are not very toxic. Just don't suck them hard. If you smell a similar smell on your mobile phone, computer, power bank and other devices, the battery may be bulging. If the battery has jacked up the shell of the mobile phone and notebook, it indicates that the "illness" is serious.

Develop good battery use habits, which can effectively extend the service life of equipment and directly reduce pollutant emissions 。 Its environmental protection effect is much greater than the commercial methods such as the manufacturer's mandatory "buckle" charging head. After all, for most users and devices, the bulging and scrapping of lithium batteries are basically equivalent to the scrapping of devices.

Follow our Weibo @ Love Computer

Follow our WeChat official account: playphone

Of course, we also pay attention to our Bilibili account: love computer