preface
Today's smart phones are different from those designed with detachable batteries in the early stage. They have rich functionality. Considering their weight and shape, their internal integration is extremely high, and the available space is further reduced; After the battery is aged, if the user does not have professional technology and tools, it is easy to short circuit the battery and the main board, or even cause the main board damage, battery burst or endanger life; So when the inside of the mobile phone expands and the frame cracks, will it burst?
Cause of battery bulge
Most mobile phone batteries use high-energy lithium-ion batteries, which generally reach the battery life limit after three or four years of use, and may also be accompanied by bulge.
For mobile phones purchased by users, the causes of battery bulge can be roughly divided into the following categories.
The first is the overcharge operation of the mobile phone. At present, the battery carried by the mobile phone has a circuit board inside, which protects the cell. When overcharge occurs, it will automatically disconnect, that is, stop charging or discharging; However, different manufacturers set different battery voltage thresholds for different mobile phone models. Continuing to charge when the battery is full for a long time will lead to changes in the structure of the positive electrode material of the battery, which will not only lead to capacity loss and accelerated aging, but also lead to chemical reactions between its decomposition and oxygen release and the electrolyte. In serious cases, the battery will bulge.
The second type is over-current charging. The circuit board inside the battery will turn on the protection when the charging current exceeds the threshold. However, when matched with an unmatched/unqualified (inferior) charger, the charging current will be too large. Charging in this scenario for a long time will not only accelerate the battery aging, but also cause the battery bulge in serious cases.
The third category is battery quality. When the original battery of the mobile phone is increasingly consumed and not used, users will choose to replace the battery or directly replace the mobile phone, and the way to replace the battery is divided into the official original factory after-sales and personal battery replacement. The quality of the original cell phone battery is needless to say. However, although the manufacturer claims that the third-party battery purchased by individuals is compatible with the corresponding mobile phone model, it is inevitable that in order to save costs and attract the market, the behavior of using inferior cells leads to uneven coating of battery electrodes, poor sealing and other problems.
The fourth is that the battery is hit violently. Although the ordinary impact will not easily cause the battery to bulge, under extreme conditions, sharp objects pierce into the battery through the back cover. The violent reaction of short circuit inside the battery will generate a lot of heat, which will lead to the decomposition and vaporization of the electrolyte, resulting in the rapid bulge or explosion of the battery.
Is the battery drum bound to explode?
After the cell phone battery has been used for a long time, the battery medium will inevitably change to a certain extent. The battery that has been used for a long time and the battery that has not been recharged for a long time will basically bulge.
The expansion of the cell phone battery indicates that the service life of the cell phone battery has reached the limit, and both its performance and safety have reached the critical value, which may lead to explosion; It is recommended to immediately replace the original factory or third-party batteries with excellent quality and safety certification.
Can the battery drum be deflated and reused?
First of all, we need to understand the causes of the gas inside the cell phone battery: the violent reaction of the short circuit inside the battery generates a lot of heat, which leads to the decomposition and vaporization of the electrolyte, and the gas generated is toxic; Secondly, the lithium battery pack is packaged in a vacuum state. It will break the package rashly, contact with the external environment, and destroy the internal balance, which will further cause electrolyte abnormalities, and in serious cases, cause explosion.
Summary of charging head network
Previously, the charging and discharging of mobile phone batteries has been briefly analyzed by the network of charging heads, which can be read by interested users. The answer to the question of whether the cell phone battery drum will explode this time is: there is the possibility of explosion; In addition, non-professionals should keep in mind that they can't operate the batteries that have been bulged at will. For the "bulge battery repair" behavior, it will further increase the probability of explosion. Do not put the "time bomb" in their hands, endangering life safety.
