Four major causes of explosion and combustion of lithium-ion batteries

Why do lithium-ion batteries explode or burn. Burning or explosion, usually because heat accumulates and does not spread, accumulates to the point of ignition, or heat accumulates to a certain point in space. As far as batteries are concerned, there are usually no four reasons that cause this to happen. 1. Internal short circuit (mostly large flexible packaging monomer): structure or process defects lead to the insertion of tabs, too little diaphragm packing, burrs, diaphragm discounts, etc. The thick ear interpolation and parallel structure that often appear in the cell, the tab insulation is not in place, the follow-up product plus the protective plate or the use process can easily lead to acute short circuit and internal combustion or explosion (internal short circuit: this person has a deep Relevant experience, and then used batteries, above 2k is actually a design defect in nature: (acute internal short circuit), but now this situation is rare, unless external force factors. 2. External short circuit: 1AH below the explosion caused by the external short circuit of the battery Rarely, it is usually caused by swelling or burning of the tabs. What I analyze is the burning caused by external short circuits of power lithium batteries or large-capacity mobile phone batteries. The insulation of tabs is not considered when customers use improper installation of metal outer boxes. Abnormal battery smoking and burning occur at the installation site; power lithium batteries are usually found to have insufficient structural fixation measures (not thoughtful). During the battery use, the shaking of the battery will damage the outer insulating protective film or the joint skin of the battery , Eventually lead to short-circuit burning. 3. Overcharge explosion: This is the most dangerous and feared company, but it is occasional. According to my understanding, there are two points: a. The user did not use the matching charger as required , Resulting in damage to the protection line. Users usually charge the charger in an unlimited time. B. The battery configuration is unreasonable, the protection board fails, and it will explode. The same is true for a messy battery. 4. The battery itself does not meet the standard. If the material is not qualified , May overheat under the calibrated voltage and current, causing accidents. Based on the above analysis, if the lithium ion battery can be properly maintained and used to prevent the occurrence of the above situation, some methods can be sorted out: 1. Frequent deep charge and discharge: Lithium Ion battery has small memory. Many friends like to use the last bit (protection board) to recharge the battery when using lithium-ion batteries or digital products with lithium-ion batteries. In the eyes of many people, this is also a way to activate the battery. In In the use of lithium-ion batteries, we call the state of running out of charge as deep charging and discharging. In fact, deep charging and discharging is an important mistake of many people using lithium-ion batteries. Scientists have concluded through experiments that they are not in other environmental conditions. Under changing conditions, the number of deep charge and discharge is directly proportional to the battery life. Multiple charge and discharge will lead to the end of the battery life prematurely. The end of the long-life lithium ion battery can easily cause the battery to bulge and cause an explosion. 2 Overcharge And the high charging and discharging situation protection board design is unreasonable and the charging time will often happen. We always like to let the device can withstand longer after the battery of the device is fully charged, but what many people don't understand is , Long-term charging and discharging conditions can cause serious damage and damage to the performance of lithium-ion batteries, and serious explosions and other extreme conditions, so the battery is fully charged, if it has been plugged in the charger, sooner or later it will lead to tragedy. 3. When charging and discharging, the current of the charger and the general current load of the electrical appliance should be within the specified range. Excessive current load will easily cause a short circuit inside the battery, which will damage the lithium ion and cause hidden circuit safety hazards. This also applies to rechargeable charging The voltage of the charger. So when we use the charger, we must also pay attention to the charger Whether the electrical appliances are qualified. 4. The working environment. Lithium-ion batteries are very sensitive to temperature. Long-term use below freezing point will have a great impact and harm on battery life. However, if the battery is left in an overheated environment for a long time, the battery life will be greatly reduced. In severe cases, the battery will explode. Statement: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: Will retired lithium-ion batteries replace lead-acid batteries?