Do you understand the Microsoft's battery management technology,?

Consumer power core, because the power required by the power device is relatively small, the power output of the single power core can basically meet the requirements, so it is rarely necessary to use several power cores together. The single core has a small amount of power, and when encountering applications with high power output, such as electric vehicles and energy storage, many cores are required to be connected in series to obtain a relatively high output voltage/output charge/output current / output power. Wait. As shown in the figure below(Figure 1 and Figure 2), many square cores and cylindrical cores(18650) are combined into one module, and many modules are combined into one pack as a power source for electric vehicles. On the Internet, someone dismantled the battery pack of Tesra modelS, 85Kh, and the cylindrical core produced by Matsushita at 7104 knots. Each 444 knots was connected in a group, a total of 16 groups, and the groups were connected in series to form a battery pack.

Musk wouldn't think so if he did. First of all, Panasonic's small cylindrical technology is excellent, taking into account the low cost and performance consistency. If you use two machines to test Panasonic's batteries and the curves are different, you should be suspicious of your test problems first. The battery production process is complex and there are many factors that affect the consistency of the core. From the front to the rear, in addition to the consistency of the material itself, there are such as ingredients / agitation/coating / cold pressure/spline / winding / liquefy / chemical. In order to improve the consistency of battery shipments, battery manufacturers will also increase the sorting process after the conversion, and select those batteries that have a large damage/self-discharge deviation. If the core consistency is not good, it will seriously affect the service life of the battery and shorten the service life of the battery pack. After many times of charging and discharging, the reversible capacity will be attenuated due to surface SEI membrane growth/side response/isolation membrane holes being blocked, etc., and the capacity will be attenuated to 80 % of the initial capacity. The design function of the electric car will be seriously affected. If the core in the module is less consistent, if the same current is used for charging and discharging, it will cause overcharging or overdischarge of some cells. This will greatly shorten the overall cyclic life cell, and inconsistency will lead to domino effect in other monomers in the battery. chain reaction. For example, if the core has a cycle life of about 1,000 times, the actual number of cycles in the battery is only about 200 times. However, if the core consistency is not good, can the group still be used?

Traditional BMS must be rejected, but it is not necessarily true if it is SDB. A traditional BMS charge wire comes in, charges / records / turns up all the batteries, and then outputs. If the core is less consistent, the problems described above will occur one by one. Further, if we open the brain hole a little wider, I will install in my battery pack two batteries, one for low power discharge at low speed cruising and the other for high power discharge at high speed stopping. Different core systems have different characteristics. The frequently considered indicators such as energy density/power density/cost/lifetime / flexibility are also in conflict with each other. If it is necessary to use different system cores in the same module, a comprehensive performance is matched. Outstanding products, Traditional BMS is more difficult.

Microsoft feels that this can be done by adding a charge and discharge management microdevice to each battery, collecting the charge and discharge voltage/current / resistor of each battery, and realizing intelligent shunt deployment, so that each charge and discharge of the core is close to the single core. Maximize the use value of the core. The main difficulty with this type of core management model is the analysis and current deployment after collecting these data. Microsoft has developed a more complex algorithm for it, and the battery package that uses this battery management model is Softwaredefinedbatty.

More importantly, this battery management model can achieve the mixed management of different chemical systems. The ways of energy storage are numerous, and the advantages and disadvantages are not the same. Different voltages / different resistors / different charge and discharge multiples. Can these batteries combine to work properly? In this regard, Microsoft used SDB to conduct an experiment and obtained good results(BatteryManagement2-in-1s). Also, in the smart watch, the use of a strap can be fitted with a flexible solid-state battery, and the polymer lithium battery under the dial can be better used to extend the standby time, which requires the SDB to better regulate the solid state batteries and liquid batteries. The cooperation between.

As for the introduction of so many charging and discharging microdevices, the money(cost) problem, the big brothers said, "It's not a thing(WebelievetheBoBopostinfeareprime SDB solotionwillnothingnigificant)." In the future, this SDB system will also connect to the vehicle's Internet of Things, understand your personal behavior and user schedule, etc., to serve your travel. Ah, our batteries are connected to big data objects, gas.

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