Research status of the protection of power lithium battery packs.solar battery storage system manufacture

　　In the final analysis, the safety of lithium ion batteries depends on the thermal stability of the lithium -ion battery material. The inconsistency of the single battery makes the thermal stability problem particularly prominent when the power lithium battery is used in parallel and series into the group. Because the characteristics of lithium battery materials determine that it is more sensitive to overheating, it makes the research on the protection circuit used for lithium batteries particularly important.

　　In response to the protection of power lithium battery packs, some measures have been 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 the lithium battery In the process, safety devices such as PTC [B8], Vent/CID, B9.40 with overcoming positive electrode materials B9.40], using armal closed isolation membrane, an electrode with PTC effect, a voltage sensitive isolation membrane with voltage isolation membrane

　　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. Management out of control may bring serious security issues.

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