Is Xiaomi Mi 10 Ultra 120W Fast Charging Safe? Xiaomi Explains Core Technology

Xiaomi Mi 10 Ultra 120W Fast Charging

Xiaomi Mi 10 Supreme Memorial Edition a.k.a. Xiaomi Mi 10 Ultra has been released, one of the highlights of the machine is equipped with 120W wired fast charging, mobile phone charging power officially entered the hundred-watt level.

This morning, Xiaomi mobile phone on the Xiaomi Mi 10 Ultra equipped with 120W charging for a detailed analysis, respectively, how Xiaomi achieved such a high-powered charging? Is the charging process safe?

The Xiaomi Mi 10 Ultra has a large 4500mAh equivalent built-in battery, and for the first time uses the industry’s rare 120W high-power wired charging, which charges 41% in 5 minutes and will charge to 100% in 23 minutes. As the industry’s first mass-produced 120W high-powered charging, there must be some questions about how Xiaomi achieves such high-powered charging.

98.5% conversion ultra-efficient charge pump
Custom, or two?

The Xiaomi Mi 10 Ultra features a new 4:2 high-power charging architecture, which not only reduces the impedance of the charging paths but also improves the overall conversion efficiency by breaking down the high current into two low-current charging paths. The two charging paths are each equipped with ultra-efficient customized charge pump charging chips, forming a dual charge pump parallel architecture.

Among them, two custom charge pumps with a conversion efficiency of up to 98.5% not only make the charging conversion rate higher but also greatly improve the stability of charging. In the 120W high-power charging process, the two 20V 3A high-voltage current into two 10V 6A low-voltage current, and finally converge into a 10V 12A high-current input battery.

This charge pump chip is specially customized by Qualcomm following Xiaomi’s charging needs, and the charge conversion efficiency is much higher than that of past charge pump chips, with higher charging efficiency and lower losses, reducing the energy loss in the charging process from the source. Secondly, the more efficient custom charge pump also reduces the heat generated during the charging process, and the lower charging temperature further extends the duration of high-power charging and improves the charging speed.

Graphene-based butterfly dual string battery: Extreme space stuffed into a 4500mAh battery

To meet the 120W high-power charging, Xiaomi Mi 10 Ultra adopts a new butterfly dual-serial battery, with two 2250mAh cells in series inside the battery, which is equivalent to 4500mAh. The structural design of the butterfly dual-cell series can double the charging power with the same charging current.

The newly designed butterfly package has a smaller protection circuit than the traditional side-by-side dual-series battery, gaining greater battery capacity with the same size. The back of the protection circuit also adds a phase change heat storage material to effectively mitigate battery temperature rise during the charging process and extend the duration of high-power charging.

Secondly, the Mi 10 Ultra also features several custom designs designed specifically for the battery to meet the demands of 120W high-power fast charging. The battery cell adopts a low internal resistance ear design, which reduces the internal resistance of the traditional battery by 36%, achieving lower charging losses and faster-charging speed, as well as lowering the temperature by 4.8℃ during the charging process.

Xiaomi Mi 10 Ultra adds a new highly conductive material – graphene-based battery cathode, conductive performance is 1000 times that of traditional carbon black material, greatly improving the charging efficiency of the battery.

Thicker and lower impedance dual FPC connection between the battery and the motherboard, on the one hand, dual FPC is conducive to current shunting through the FPC connector to avoid overheating during high-power charging, dispersing the heat source; on the other hand, the thicker and lower impedance of the custom FPC also effectively reduces the energy loss in charging, reducing heat generation while enhancing charging efficiency.

Besides, the Mi 10 Ultra also uses Battery Sense cell voltage monitoring technology to accurately detect the true voltage of the cell, effectively avoiding errors brought about by the battery protection circuit, matching a more accurate charging strategy during the charging process, making the overall charging time further shortened.

Also, the cell voltage detection and cell balancing algorithm can balance the voltage difference between the dual cells to avoid overcharging of high-voltage cells and over-discharging of low-voltage cells to prolong battery life.

34 safety protections for worry-free charging: Independent charge control chip, abnormal one key power off

The Xiaomi Mi 10 Ultra is fast charging, but also adds up to 34 security measures to protect the safety of high-power charging, truly a full range of protection from the charger, the phone charging circuit to the battery. An independent MCU charging safety chip is added to the charging circuit, which can directly shut down 120W charging once abnormal charging status is detected; an anti-pumping circuit is specially designed for high-power charging to avoid the damage caused by using a 5V charger during the charging process; the Type-C charging port adds more corrosion-resistant rhodium ruthenium alloy material to reduce the corrosion problems caused by high-power charging.

In addition to hardware protection, the Mi 10 Ultra has also passed TÜV Rheinland Safety Fast Charging Certification 3.0, so you don’t have to worry about safety issues while experiencing the thrill of rapid charging.

Not only fast charging but also long-lasting use: 800 complete charge/discharge cycles with an effective capacity of at least 90%.

With a 120W fast charge of 41% in 5 minutes and 100% in 23 minutes, the Xiaomi Mi 10 Ultra can do faster charging. First of all, it’s a matter of choice, with the battery size relatively close to the premise, choose faster-charging speed or larger battery capacity, and the Xiaomi Mi 10 Ultra chose the latter, the battery capacity of 4500mAh, larger battery capacity to ensure the endurance, especially in the current 5G environment.

In daily use, fast charging is a supplement to the large battery, the increase in charging speed are a disguised means of supplementing the range, the Xiaomi Mi 10 Ultra has chosen to prioritize the guarantee of a large battery long endurance.

In terms of battery life, the Mi 10 Ultra uses a high life of the fast-charging battery, 800 complete charge and discharge cycles after the effective capacity of the battery is not less than 90%, while the industry standard battery commonly used 400 cycles 60% of the standard. In the long run, Xiaomi Mi 10 Ultra can greatly reduce the drop in the effective capacity of the battery, to ensure long-term use of the phone’s life after use.

The Xiaomi Mi 10 Ultra not only has a 120W high-powered wired second charge, but also supports the fastest 50W wireless second charge, which can be charged to 100% in 40 minutes, and the charging speed is even faster than the 50W wired charge on the market, with 10W wireless reverse charging, which truly achieves an all-round, all-scene super-fast charging experience.


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