The issue of unsafe lithium battery packs and explosion of lithium batteries is the focus of attention. Lithium batteries are more and more widely used in daily life. However, due to the occasional explosion of Samsung note7 and iPhone batteries recently, people are often criticized. So, is lithium battery safe? This article will analyze it. Soft pack battery equipment

　　Lithium batteries are a type of batteries that use lithium metal or lithium alloy as the negative electrode material and use a non-aqueous electrolyte solution. With the development of science and technology, lithium batteries have now become the mainstream, and "lithium electric heating" has been launched in the market. Lithium battery application research and development equipment

　　Are there any safety hazards to lithium batteries?

　　The safety issue of lithium battery packs is not only related to the nature of the battery material itself, but also related to battery preparation technology and use. The frequent explosions of mobile phone batteries are due to the failure of the protection circuit on the one hand, but more importantly, the material has not fundamentally solved the problem.

　　Lithium battery safety hazards come from five aspects

　　1. The safety hazards of cathode materials

　　2. The safety hazards of anode materials

　　3. The safety hazards of diaphragm and electrolyte

　　4. Safety hazards in the manufacturing process

　　5. Safety hazards during battery use

　　Is the explosion of lithium batteries real?

　　With the rapid development of lithium battery packs and new energy devices, while improving our lives, problems have also followed. The explosion of Samsung note7 and iPhone batteries and the recent serial burning of the crab island bus have triggered people’s concerns. Concerns about new energy technology.

　　Taking the lithium ion battery installed inside the mobile phone as an example, the main reasons for the explosion of the lithium battery pack are as follows:

　　1. External short circuit

　　The external short circuit may be caused by improper operation or misuse. Due to the external short circuit, the battery discharge current is very large, which will cause the battery core to heat up, and the high temperature will shrink or completely destroy the diaphragm inside the battery core, causing an internal short circuit and exploding .

　　2. Internal short circuit

　　Due to the internal short-circuit phenomenon, the large current discharge of the battery cell generates a lot of heat, which burns the diaphragm and causes a greater short-circuit phenomenon. In this way, the battery core will generate high temperature, decompose the electrolyte into gas, and cause excessive internal pressure. When the shell of the battery cell cannot withstand this pressure, the battery cell will explode.

　　Three. Overcharge

　　When the battery cell is overcharged, the excessive release of lithium from the positive electrode will change the structure of the positive electrode. If too much lithium is released, it is easy to be unable to be inserted into the negative electrode, and it is also easy to cause lithium deposition on the surface of the negative electrode. Moreover, when the voltage reaches 4.5V or more, The electrolyte will decompose to produce a large amount of gas. All of the above may cause an explosion.

　　4. Too high moisture content

　　Moisture can react with the electrolyte in the battery cell to produce gas. When charging, it can react with the generated lithium to generate lithium oxide, which causes the capacity of the battery cell to be lost. It is easy to overcharge the battery to generate gas and decompose the water. The voltage is low, and it is easy to decompose to generate gas when charging. When this series of generated gas will increase the internal pressure of the battery, when the shell of the battery cannot withstand it, the battery will explode. Cylindrical battery production equipment

　　5. Insufficient negative electrode capacity

　　When the capacity of the negative electrode part opposite the positive electrode part is insufficient, or there is no capacity at all, part or all of the lithium produced during charging cannot be inserted into the interlayer structure of the negative electrode graphite, and will precipitate on the surface of the negative electrode, forming protruding “branches”. "Dendrite" will be more likely to cause the precipitation of lithium during the next charge. After tens to hundreds of cycles of charging and discharging, the "dendrites" will grow up and eventually pierce the diaphragm paper and cause internal short circuits. .

　　All of the above are the reasons that can cause lithium battery packs to explode. There are many factors that affect the safety of lithium batteries. We cannot kill a group of people with one stick. We still have to consider many aspects to minimize external factors that cause lithium battery problems. Enterprises improve technology and testing capabilities. Users should pay attention to it during use.