The "Super VOOC Super Flash Charge" function displayed by OPPO on MWC, a video of 2500mAh capacity battery from 5% to 100% in a period of 10 minutes or so makes many people call black technology. If the mobile phone can replenish the power so quickly in the future, it is really practical. If the mobile phone battery itself has high energy storage, it is better. With this opportunity, let us talk about the things of mobile phone fast charging and battery technology today.
Let's first understand the three stages of complete charging of a lithium-ion battery: constant current pre-charging, high-current constant-current charging, and constant-voltage charging. After the power consumption of the mobile phone is reduced, the voltage is lowered. When it is lower than a certain value, the charger will precharge the lithium battery with a relatively low current. After a period of time, the voltage of the lithium battery is higher than the predetermined value, and then enters the second stage of high current constant current charging. At this time, the current can be increased by appropriately increasing the current. The specific process can refer to the following figure.
Clearly the above two processes are not difficult to understand the two core points of the OPPO flash charging technology: one is the segmentation charging current control, and the other is the multi-line setting of the charging cable and the battery. From the introduction of the Super Flash Charger, this guess can be confirmed: "The low-voltage pulse algorithm developed by OPPO in conjunction with OPPO's exclusive custom-made super battery can strictly regulate the charging current". I believe the "low voltage" mentioned here. The pulse algorithm refers to the segmented charging current control, and the so-called "super battery" is the multi-line setting technology of the battery.
In junior high school physics, we have learned "parallel shunt", although increasing the current can reduce the charging time, but the current is too large to easily overheat the system. At this time, multiple batteries are shunted in parallel (OPPO fast charging battery contacts are several more than ordinary batteries) ) can effectively solve this problem. Reducing the resistance of the cable can also reduce heat generation, so we see that the OPPO's super fast charging cable in the live demonstration is almost the same thickness as the laptop charging cable.
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