Not long ago, Zimi launched a mobile power bank with a capacity of 10000mAh, which is different from the traditional mobile power supply, this product not only has a mini body, but also contains a powerful output, and the small volume can support a maximum of 30W fast charging.
In fact, for mobile power, 30W is a relatively awkward power level, there are only a few mass-produced products on the market, and this small size of mini 30W fast charging mobile power supply is unprecedented, Zimi can be regarded as the first.
What new technologies are used in Zimi 10000mAh 30W fast charging mobile power supply? Why can 30W fast charging be achieved in a small volume? With problems, the charging head network placed an order for the first time to buy one, and the internal structure of the product will be shared with you below.
First, purple rice 10000mAh two-way fast charging mobile power supply appearance
From the packaging point of view, Zimi 10000mAh mobile power supply follows the traditional style of the family, the front is the main view of the product, the three major selling points are: small and portable, support 30W fast charge output, support USB-C port two-way fast charge.
On the back of the box is printed the manufacturer's information and detailed product parameters.
The power bank is wrapped in a dust bag and comes with a USB-A to USB-C charging cable.
Black USB-C to USB-A charging short line, can be used with a mobile power supply to charge the mobile phone is more convenient, but also can be used to recharge the power bank itself.
The length of this line is about 30cm.
The power bank is a pure black PC shell with the ZMI logo printed on the front.
Zimi 10000mAh power bank is designed with silver gray glossy surface at both ends, and the bottom panel is made of metal and printed with product parameters.
The bottom metal cover plate is designed with a concave design to prevent product parameter fouling during use.
Product Name: ZMI 10000mAh Two-way Fast Charge Mobile Power Bank MINI High Edition
Model: QB818
Battery type: Lithium-ion battery
Rated Capacity: 5600mAh(5V)
Battery energy: 35.5Wh/36.3Wh 9800mAh/10000mAh
输入:5V3A、9V2.5A、12V1.8A、15V/1.5A
Output: 30W MAX
USB-A单口:5V2.4A、9V2.23A、12V1.67A
USB-C单口：5V3A、9V3A、12V2.25A、15V2A
Dual output: 5V3A
Manufacturer: Jiangsu Zimi Electronic Technology Co., Ltd
The top panel is 1A1C with two connectors, four LED indicators and a power switch button.
Through comparison, it can be roughly seen that the thickness of this mobile power supply is equivalent to the diameter of a one-dollar coin, and the width is equivalent to twice the diameter of one-dollar coin.
Small body, put into the backpack or luggage will not take up too much space, even if you go out to hold in your hand is also very pocket-sized and lightweight, and the conventional mini fast charge mobile power bank is not much different.
The Zimi 10000mAh power bank is much smaller than the iPhone 12 mini.
The net weight of this product is about 203g.
The length of the power bank is about 98.43mm.
The width is approximately 50.22mm.
The thickness is approximately 26.13mm.
In terms of performance, using the ChargerLAB POWER-Z KT002, this USB-A port supports APPLE 2.4A, Samsung 5V2A, QC3.0, QC2.0, AFC and other charging protocols.
The USB-C interface supports apple 2.4A, Samsung 5V2A, QC3.0, QC2.0, AFC, FCP, USB PD3.0 PPS and other charging protocols, in PPS mode, its maximum output power is 33W.
PDO messages show that this mobile power supply supports four sets of fixed voltage output levels of 5V3A, 9V3A, 12V2.5A, 15V2A, and also supports 5-11V 3A PPS voltage gears.
Second, Zimi 10000mAh two-way fast charging mobile power disassembly
First, the panel is removed from the top of the power bank, where the panel is fixed with double-sided adhesive fit.
Then remove the bottom cover of the mobile power supply, and the bottom cover is also fixed with double-sided adhesive.
Remove the screws and pull out the internal PCB and battery module.
One side of the inner frame is a skeleton design, two 21700 cylindrical cells are visible, and a thermistor is fixed with thermal adhesive in the middle for temperature monitoring of the battery.
A single sheet of graphite thermal stickers is affixed to the back of the frame.
The sticker on the side shows the battery pack information: rated voltage 7.26V, capacity 4900mAh, charging limit voltage of 8.4V. It can be seen that the product uses a structure of two batteries in series.
The internal module housing is disassembled, and the control circuit part adopts the design of two PCB boards, and there is a thermal pad near the interface.
Both batteries are Samsung INR21700-50E, with a size of 21700 and a single capacity of 5000mAh. This battery cell is the same as Zimi 200W mobile power supply. The battery is printed with precautions, fire hazard, can not be used for e-cigarettes, prohibited installation, carrying or hand-held.
The two PCB boards are fixed with a plastic frame, and the thermal pad is mainly used for heat dissipation of buck-boost converters.
Another PCB has a power inductor soldered on it. Two sets of pins are used between the two PCB boards to connect power supply and communication, and each set is 8 pins.
Remove the two PCB boards.
One of the PCBs is centered on a mobile power buck-boost chip, and the left interface is a battery protection chip and a battery protection tube.
Silk screen printed 3BR2 battery protection chip, the right side of the broken battery protection tube, using CSP package, patch soldering.
Buck-boost conversion adopts South Core SC8905. This is a bidirectional synchronous buck-boost converter with four low-drag switch tubes integrated in it, which has a high conversion efficiency to reduce heat generation, while minimizing peripheral device BOM, optimizing PCB space and cost. The chip uses a current control mode that supports an ultra-wide 2.7V to 22V voltage input to effectively manage the charging of 2 to 4 batteries, and can reverse the battery discharge function when the system needs to obtain energy from the battery.
Nanxin SC8905 has an I2C interface, users can easily and quickly set the charging or discharging mode, charging current, VINREG voltage, reverse discharge voltage, current limit, switching frequency, etc. through I2C; the charging voltage and current limit can be set by external resistors. The SC8905 also supports internal current limit, overvoltage/undervoltage protection, output short-circuit protection, and overtemperature protection to ensure that the system can accommodate a variety of abnormal conditions.
TDK SPM series 2R2 power inductors, combined with the South Core buck-boost converter to achieve 2-string battery buck-boost output.
TDK SPM Series 2R2 Power Inductor Data.
A screen printing 3210 single-chip microcomputer for power indicator, whole machine control function.
There are three MOSs next to the USB-C connector.
USB-C port input and output switching protection switch tube adopts Bandai AON7534, NMOS, withstand voltage 30V, two convection series to prevent backfilling.
Bandai AON7534 data information.
DIODES DMT3020LDV Dual NMOS, Silk Screen AR5, Withstand Voltage 30V for Load Detection and Shutdown Outputs.
DIODES DMT3020LDV data information.
USB-C port protocol chip, using Tiande Yu FP6606. This is a high-performance USB PD3.0 protocol chip, there are currently TQFN-24 and TQFN-16 two packaging methods, in addition to supporting USB PD3.0 fast charging, Tiande Yu FP6606 can support QC4+, QC3.0, QC2.0, AFC, FCP, SCP and APPLE 2.4A and other mainstream charging protocols, strong compatibility.
Tiande Yu FP6606B detailed specifications.
USB-C interface close-up, from Dennet Technology Co., Ltd.
The USB-A interface is covered with dust-proof stickers and the solder joints are reinforced with hard glue to prevent damage.
Next to the pin connector is a silk screen printed WB50 chip.
Four LEDs.
Next to the USB-A interface, there is a silk screen GF6R protocol chip for A-port fast charging support.
Zimi 10000mAh mobile power supply has all been disassembled.
Charging head net disassembly summary
At present, there are two main types of mobile power on the market, one is to take the small capacity low power route, the power of such products is generally below 22.5W; the other is to take the large capacity and high power route, using multiple strings of lithium battery packs, the power is basically above 45W, of course, the volume is relatively large.
Zimi 10000mAh two-way fast charging mobile power mini high version is to integrate the two advantages of small capacity and high power, on the basis of 10000mAh to achieve up to 30W output power, breaking through the industry bottleneck. In terms of performance, this mobile power supply in a single port output, both interfaces can support fast charging function, USB-C port in the output mode, up to 15V output voltage, can even directly charge the laptop, but also has PPS fast charging, can achieve 30W fast charging for some Xiaomi mobile phones.
In terms of materials, this mobile power supply adopts two Samsung 21700 power cells in series to form a battery pack; the power control part uses the buck-boost chip SC8905 built-in MOS of the South Core, which realizes the streamlined peripheral design, and the protocol part adopts the Tiande Yu FP6606B chip, the association certification, and the buttons and interfaces are all used for static protection, which is reliable and stable.