The role of the BMS?

Retired electric vehicle power battery recycling pressure although not imminent, but there is no doubt about the looming problem now should take preventive measures, to prepare early. Oil era is coming to an end, streetcar era is coming. According to the calculated prediction, in 2017 China will have retired GWh power battery, 2020 GWh 10 scale. In addition to determine the scrapping the dismantling of raw materials, the rest can be used again in other scenarios cell arrangement in use can play a more surplus value of power battery, realize the circulation economy, is a more environmentally friendly and efficient way. However, in order to realize power battery arrangement in use, in addition to the business operation level, difficulties and lack of policy rules and regulations, the pure technical level facing a huge barrier in the first place, if can't solve the problem of basic technical implementation, the good intentions behind the unavoidable deals, make the mistake lead-acid battery resources waste pollution of the environment. Pilot use, namely used to use, such as second-hand car, second-hand furniture, second-hand equipment, the need to make sure this is the second hand the residual value of the goods. In general second-hand goods according to the date of production or use fixed number of year, i. e. , according to the time to determine residual value. But power battery is special, only from the time, such as the manufacture date, the cumulative time using a single data cannot judge surplus value, because the battery surplus value is nonlinear relationship with time, also is not the single function of time, you also need to SOH and other critical data, and the data is in use process by BMS ( Battery management system) Measurement are computed. So here's the technical difficulties, one is the accuracy of the data, the second is the integrity of the data, the third is the availability of data, four is the security of data. This a few problems with the BMS can't get away, so the arrangement and utilization of power battery and BMS is the key. First is to determine what kind of configuration do you want to use again to the power battery. Single cell and the single string ( Multiple independent parallel) , module ( Multiple single string parallel) Or power battery PACK ( Multiple modules in series) 。 Single batteries and battery PACK is obviously unrealistic: a huge number of monomer batteries BMS nor in view of the data record monomer batteries, reorganization of the matching work need to be repeated again, the effort on cost; The whole PACK for each single battery performance may be greatly different, to PACK again use is not appropriate. By the same token, the module as the unit is not appropriate, the most suitable is the single string of batteries. This article from: encyclopedia of China