Research status of protection research on power lithium battery packs -Lithium - Ion Battery Equipment
For the protection of the use of power lithium -ion battery packs, some measures are currently taken in battery product design and application control. According to the analysis of battery resistance, the stronger the resistance of the battery positive material is stronger, the stronger the corresponding battery resistance. Therefore, in order to improve the overcoming performance of lithium -ion batteries, on the one hand, in battery products, in battery products During the design process, safety devices such as PTC, Vent/CID are used, the positive electrode materials with overcoming charge, the use of thermal closed isolation membrane, an electrode with a PTC effect, a voltage -sensitive isolation membrane with voltage isolation membranes use.(Lithium - Ion Battery Equipment)
Or add the over -the -fitting additive. On the one hand, in order to prevent the lithium -ion battery from overcoming and discharging and ensuring the safety of the battery, in practical applications, a single battery and battery pack have loaded the protection circuit and used a special charging management system. Major semiconductor companies have also launched integrated management chips for lithium -ion battery protection, such as BQ77910 of TI companies, OZ890 from Budon Technology. This method is directly and effective, but it is not foolproof. Especially for the use of high -voltage electric vehicles, such as BYD's upcoming second -generation dual -mold electric vehicle named Qin, the voltage level has reached 500V, and the number of batteries is hundreds of hundreds. It may bring serious security issues.
In addition, the energy consumption problem of the single battery management circuit has gradually become a problem to consider battery protection. Aiming at the energy consumption problem of monomer battery management circuits, a low power design has been conducted in the detection of individual battery voltage and temperature in the single battery management circuit. However, when the battery pack is overloaded with a large output large current, or the battery is placed for too long leakage, the battery voltage is very low (below 2.65V), at this time, the single battery management circuit at the end of the battery will still consume battery energy energy energy energy energy energy. , Especially for electric vehicles that are not used for a long time, a single battery management circuit at the end of the battery at both ends of the battery will over -discharge the battery pack until the internal single battery is discharged to damaged state. At present, there are very little research on automatic power loss design when the single battery management circuit is over -discharged by a single battery. Most battery management methods are automatically lost through relay when the battery pack is under pressure. However, the disadvantages of this method are not high reliability and high energy consumption.
Or add the over -the -fitting additive. On the one hand, in order to prevent the lithium -ion battery from overcoming and discharging and ensuring the safety of the battery, in practical applications, a single battery and battery pack have loaded the protection circuit and used a special charging management system. Major semiconductor companies have also launched integrated management chips for lithium -ion battery protection, such as BQ77910 of TI companies, OZ890 from Budon Technology. This method is directly and effective, but it is not foolproof. Especially for the use of high -voltage electric vehicles, such as BYD's upcoming second -generation dual -mold electric vehicle named Qin, the voltage level has reached 500V, and the number of batteries is hundreds of hundreds. It may bring serious security issues.
In addition, the energy consumption problem of the single battery management circuit has gradually become a problem to consider battery protection. Aiming at the energy consumption problem of monomer battery management circuits, a low power design has been conducted in the detection of individual battery voltage and temperature in the single battery management circuit. However, when the battery pack is overloaded with a large output large current, or the battery is placed for too long leakage, the battery voltage is very low (below 2.65V), at this time, the single battery management circuit at the end of the battery will still consume battery energy energy energy energy energy energy. , Especially for electric vehicles that are not used for a long time, a single battery management circuit at the end of the battery at both ends of the battery will over -discharge the battery pack until the internal single battery is discharged to damaged state. At present, there are very little research on automatic power loss design when the single battery management circuit is over -discharged by a single battery. Most battery management methods are automatically lost through relay when the battery pack is under pressure. However, the disadvantages of this method are not high reliability and high energy consumption.
