Xiaomi today unveiled its 300W charging technology. In the 300-watt wired charging mode, it only takes 5 minutes to charge the 4100mAh battery of the Redmi Note 12 Explorer Edition, and it can be charged to 10% in 43 seconds, 50% in 2 minutes and 13 seconds, and 100% in 5 minutes.
It is worth mentioning that this set of “magic modifications” involves the charger side, the phone side charging architecture and the entire structure of the battery side, so ordinary users should not consider trying it for the time being.
From Xiaomi’s official test data, its peak power can reach 290W, and more than 280 watts of power can be maintained for 2 minutes and charge the phone to 50%.
According to the introduction, Xiaomi uses the full link of its own 300-watt fast charging architecture, the original charging architecture of the machine using a custom 6:2 charge pump chip, the highest conversion efficiency of the chip up to 98%. Compared with the conventional 4:2 charge pump solution, it solves the problem of high current heating in the charging input path and reduces the charging temperature rise from the source.
At the same time, the decentralized layout of multiple charge pumps effectively avoids heat concentration and extends the high-power charging time.
It’s worth mentioning that the 300-watt Magic Second Charge is based on a dual-string battery design with a high input current of 30A, requiring the battery cells to have a 15C ultra-high charging multiplier. Therefore, Xiaomi introduced a new hard carbon material in the cell phone battery. Compared with graphite, the hard carbon structure is more sparse and disordered, which can provide a more relaxed reaction path for lithium ions.
In addition, with the new process and process optimization measures, the thickness of the positive and negative electrode sheets has also been significantly compressed, further reducing the thickness by 35% compared to conventional electrode sheets. At the same time, by introducing new lithium salt additives and modulating the core solvent ratio, the electrolyte achieves ultra-high conductivity, which effectively enhances the lithium-ion migration rate and reduces the charging temperature rise.
In terms of structure, they adopt a “sandwich” stacking scheme different from the conventional double cells side by side to achieve stronger heat dissipation + higher space utilization, and the matching battery PCM protection plate is also a double-layer design, which can effectively reduce the space occupied by the protection plate by 50%.
As for the charger, the 300W charger also receives a transformative upgrade, which adopts the fourth-generation GaN integrated solution with high power, small size, low heat generation, and higher efficiency. The planar transformer is a more integrated modular design, further compressing the device footprint.
In terms of heat dissipation, the 300-watt charger in the gluing even thermal basis, but also an additional large area of graphene auxiliary heat dissipation, double heat dissipation, to achieve ultra-high power output. Xiaomi says that with a 43% jump in power, its size is identical to Xiaomi’s previous generation 210-watt charger, with a power density of 2.31W / cm³.
It is not clear when this set of muscle show technology will be commercially available.
