Explore the safety of power lithium batteries

What is a lithium battery? On the safety of power lithium batteries. What is a lithium battery? On the safety of power lithium batteries. The nominal voltage of the lithium battery is 3.7v (3.6v), and the charge cut-off voltage is 4.2v. Because the lithium battery itself has a certain internal resistance, when the output electric energy is pure electric power supply energy, a certain amount of heat will appear, which will increase the temperature of the battery. When the temperature exceeds the normal operating temperature, it will endanger the life and safety of the battery. Lithium batteries are secondary batteries (rechargeable), and it is important to rely on lithium ions to move between the positive and negative electrodes. During charging and discharging, lithium ions are inserted and removed back and forth between the two electrodes: during charging, lithium ions are removed from the positive electrode and inserted into the negative electrode through the electrolyte. When unloading, the situation is just the opposite. Lithium battery is a representative of modern high-performance batteries. It consists of four important parts: positive electrode data, negative electrode data, gap and electrolyte. Lithium batteries have partially replaced traditional batteries in mobile phones, laptop computers, video cameras, and cameras. Large-capacity lithium batteries have been tested on electric vehicles and will become one of the important power sources for electric vehicles in the 21st century. In addition to the high voltage of the lithium battery, because the maintenance board of the lithium-ion power lithium-ion battery can accurately monitor the low-power intelligence of each single battery, it has a perfect charge, and it is discharged, temperature, overcurrent, short-circuit maintenance, and reliable lock. The self-recovery function and equalizing charging function greatly extend the service life of the battery. On the safety of power lithium batteries, the factors that affect the safety performance of power lithium batteries run through the entire life cycle of power lithium ion batteries from the selection of the battery to the end of use. The battery data itself, the battery manufacturing process, the integration of the battery and the BMS (battery handling system), and the safety planning and operating conditions are all factors that affect the safety of lithium batteries. In these links, manufacturing errors and abuse are not preventable, so in this realistic situation, the thermal runaway plan for power lithium batteries is particularly important. Lithium Battery Handling System (BMS) is expected to solve the key problems of power batteries. The processing system must deal with the battery and its consistency in order to achieve maximum energy storage, reciprocating efficiency and safety under different conditions (temperature, altitude, maximum multiplier, state of charge, cycle life). The system includes a data acquisition module, a communication unit module and a battery status evaluation module. With the development of lithium batteries, the requirements for the processing capacity of BMS are getting higher and higher. Added new modules such as heat treatment module and high voltage monitoring module. By adding these safety modules, it is expected to improve the safety and reliability of lithium batteries in the application process. The flammability and liquid state of currently widely used commercial electrolytes are not particularly ideal and safe options. If the lithium ion conductive Li+>104Scm1 solid electrolyte is used, it can prevent the lithium branched crystal from penetrating the barrier of the positive electrode, thereby solving the safety problem. On the other hand, when the negative electrode is in contact with the carbonate electrolyte and the positive electrode is in contact with the aqueous electrolyte, the stability problem can also be solved. The first method to solve the thermal runaway of lithium batteries. The progress of cooling methods. The heat production system is important to control the temperature to ensure that the battery is always at a reasonable working temperature. Generally, the heat treatment system is controlled by the vehicle controller. When the temperature of the battery pack is abnormal, it should be cooled or heated by the air-conditioning system in time to ensure the safety and service life of the battery. Internal data and structure improvement Internal improvement is to transform the internal data structure of the battery, so that the lithium battery has better heat resistance and heat dissipation function. As far as current research hotspots are concerned, solid electrolytes; positive and negative electrodes have been reconstructed. The introduction of safer gap data from the inside has improved one of the mainstream battery thermal functions. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: What are the important parameters for lithium battery customization?