How to improve battery safety?

Improve battery safety For manufacturers of lithium battery packs, it is essential to supply safe and reliable products for the battery supply system. The battery processing circuit in the battery pack can monitor the working status of the lithium battery, including battery impedance, temperature, battery voltage, charging and discharging current, charging status, etc., to provide specific working hours and battery health information systems to ensure that the system is correct Choose and plan. In addition, in order to improve the safety function of the battery, even when only one defect occurs, such as overcurrent, short circuit, high voltage of the battery and battery pack, and high temperature, the system will turn off the two back-to-back maintenance MOSFET and lithium battery series, disconnect battery. The battery processing unit (BMU) based on impedance shadowing technology will monitor the impedance and voltage imbalance of the unit during the entire battery life, and may detect the micro short circuit of the battery to prevent the battery from forming a fire or even an explosion. Lithium battery is safe. Excessive operating temperature will accelerate the aging of the battery and may cause heat loss and explosion of the lithium battery pack. Regarding the high-activity, high-energy material lithium battery, this has received extensive attention. High current overcharge and short circuit may cause the battery temperature to rise rapidly. During the overcharging process of the lithium battery, lithium metal is deposited on the positive electrode of the battery. This material greatly increases the risk of explosion because lithium may react with various materials, including electrolyte and cathode materials. For example, a lithium/carbon intercalation compound reacts with water to release hydrogen, which may be ignited by the exotherm of the reaction. When the temperature exceeds the thermal runaway temperature limit of 175°C (battery voltage 4.3v), the cathode material (such as LiCoO2) will also start to react with the electrolyte. Lithium batteries use a very thin microporous film material, such as polyolefin, to block the electrons between the positive and negative electrodes of the battery due to its excellent mechanical properties, chemical stability and acceptable price. The low melting point of polyolefin is planned from 135°C to 165°C, making it suitable for use as a fuse material. When the temperature rises and reaches the melting point of the polymer, the porosity of the material will fail. The purpose is to prevent lithium ions from moving between the electrodes and then shut down the battery. Thermal ceramic (PCT) equipment and safety vents together provide rated maintenance for lithium batteries. The battery case, generally used as the negative electrode, is generally a typical nickel plate. In the case of a sealed case, metal particles may contaminate the inside of the battery. Over time, particles may migrate to the insulated anode and cathode between the barrier and aging. There is a very thin short circuit between the positive and negative electrodes, which allows the electrons to move freely and eventually renders the battery useless. In most cases, this failure is equivalent to battery failure and complete suspension. In rare cases, the battery may overheat, melt, catch fire or explode. This is an important source of recently reported battery defects and has led many manufacturers to recall their products. 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: Battery Processing Unit (BMU) and Battery Maintenance