Preface
Xiaomi has launched a self-wired power bank, which has a built-in 10000mAh polymer lithium-ion battery and comes with an 18cm long USB-C charging cable, which can be used to charge the mobile phone with its own charging cable, or it can be charged by connecting the charger with its own cable.
The power bank body is also equipped with USB-C and USB-A interfaces, with a maximum output power of 22.5W, in addition to supporting PPS fast charging, which supports fast charging for Apple and Android mobile phones. The following charging head network will bring the dismantling of Xiaomi's self-wired power bank, and take a look at the internal materials and design.
Xiaomi comes with a wired power bank pocket version unboxing
The front of the box is printed with the Xiaomi brand logo, product name and appearance.
Product specifications are printed on the back as well as business information.
Close-up of the parameters on the packaging box, and then introduce it to the physical display of the product.
The package contains Xiaomi's own wired power bank and instruction manual.
Xiaomi's self-wired power bank has two types of gray blue and light coffee color, and the body is made of PC+ABS material, with fine grain treatment on the surface and delicate feel. At the same time, the low-saturation color scheme complements the minimalist design, which is understated and elegant.
The front of the fuselage is only silk-screened with the "Xiaomi" brand logo.
The back is printed with the power bank parameter information.
Close-up of product parameters
Model: P15ZM
Battery type: Lithium-ion polymer battery
电池能量：37Wh 3.7V 10000mAh
额定容量：5500mAh（5V/3A）
输入1:5V3A、9V2.5A
输入2:5V3A、9V2.5A
Output: 22.5W MAX
Multi-port: 5V3A
输出1:5V3A、9V2.23A、12V1.67A、10V2.25A MAX
输出2:5V3A、9V2.23A、12V1.67A、10V2.25A MAX
输出3:5V3A、9V2.23A、12V1.67A、10V2.25A MAX
Manufacturer: Jiangsu Zimi Electronic Technology Co., Ltd
The power button is configured on one side of the fuselage.
The power bank comes with a USB-C output short cable, and the other side is designed with a USB-C terminal slot.
The USB-C cable terminal housing is equipped with a small round groove for easy user use.
The storage slot is designed with a hemispherical protrusion to assist in fixing to prevent the USB-C cable from falling off easily.
In addition, the top is also equipped with 1A1C dual USB interfaces.
There is also a battery indicator design next to the USB-C port, which is bright white, and the four single ones represent 25% of the battery.
The measured length of the power bank body is 105.17mm.
The width is 65.23mm.
The thickness is 26.46mm.
In addition, the length of the USB-C cable was measured to be about 18cm.
The size of the product in the hand is intuitively felt.
The overall weight of the power bank is about 214g.
使用ChargerLAB POWER-Z KM003C测得USB-C线输出正常PD3.0、PPS、QC4、DCP充电协议。
PDO报文显示还具备5V3A、9V2.23A、12V1.67A三组电压档位,以及5-11V2.25A一组PPS电压档位。
测得USB-C口支持FCP、AFC、QC3.0/4+、PD3.0、PPS、DCP、Apple 2.4A充电协议。
PDO报文显示USB-C口还具备5V3A、9V2.23A、12V1.67A三组电压档位,以及5-11V2.25A一组PPS电压档位。
The USB-A port supports FCP, AFC, QC3.0, and DCP charging protocols.
Xiaomi comes with a wired power bank pocket version disassembled
After reading the appearance and test of Xiaomi's self-wired power bank, let's disassemble it and take a look at the internal materials and design.
First of all, disassemble the power bank shell along the seam of the shell, and glue the inner battery and the shell to fix it.
The top of the housing is the PCBA module, and the bottom is the battery pack.
Paste a thermal pad on the PCBA module to enhance heat dissipation.
Remove the thermal pad, and underneath the thermal pad is the power conversion chip.
The power bank comes with a connection cable that is fixed by a screw platen.
The self-supplied wire connects the positive and negative poles and CC wires, and the wire welding is marked with color and glued and fixed.
The battery is connected to the PCBA module by spot welding.
The PCBA module is fixed inside the housing with screws.
Unscrew the set screws and remove the battery pack and PCBA module.
Foam is applied to the inside of the housing for cushioning.
Close-up of the key structure inside the housing.
Thermal pads are also provided in the other half of the housing.
A thermistor is attached to the side of the battery to detect the temperature of the battery.
The built-in battery of the power bank comes from LS Lishen, model SP995662SE, rated voltage of 3.7V, capacity of 5Ah, energy of 18.5Wh, charging limit voltage of 4.35V, and two pieces in parallel to form a 10000mAh capacity.
The front of the PCBA module is at a glance, the left side is welded with a button switch, an alloy inductor, a VBUS switch tube is welded above the inductor, and a power chip and VBUS switch are welded on the right side. The thermistor is welded in the lower left corner to detect the battery temperature, and the battery protection tube below is sealed.
The back side is soldered with the main control MCU, battery protection chip and VBUS switch tube.
The internal power chip of the power bank comes from Nanxin Technology, model SC8934, which is a synchronous charger with a built-in MOS tube and supports reverse boosting. The chip can be controlled through the I2C interface, supports 12V input, bucks to charge the battery, and boosts the output of the battery. The battery voltage and switching frequency are programmable, support NTC temperature detection, built-in perfect protection function, and use QFN4*4-32 package.
Nanxin SC8934 Facts.
Close-up of 2.2μH alloy inductor, edge gluing reinforcement.
A 10mΩ sampling resistor is used to sense the output current.
Close-up of input and output filter capacitors.
The VBUS switch for the USB-C interface is from Weizhao Semiconductor, model VS3640DE, dual NMOS, withstand voltage 30V, conduction resistance 15mΩ, and is available in a PDFN3333 package.
Weizhao Semiconductor VS3640DE Profile Information.
Two 8205 MOS tubes are used for self-wired VBUS control.
The 8205T MOS tube is used for USB-A interface VBUS control.
The data line corresponding to each interface is equipped with a TVS diode for overvoltage protection.
The main control MCU comes from ABOV modern microcontroller, model A94P829LUN, used for power supply port input and output control, protocol identification, power display and protection functions, etc., supports two USB-C interfaces and one USB-A interface application, and adopts 24QFN package.
Battery protection chip silk screen printing 50TG.
The battery protection tube is covered with hard glue.
There is an indicator light shading grille above the USB-C receptacle.
Close-up of four LED battery indicators.
Close-up of side-welded patch buttons.
The USB-C receptacle is soldered via via.
The USB-A receptacle is made of black glue core.
A list of all dismantling and a family photo.
Summary of the dismantling of the charging head network
Finally, a list of core components of Xiaomi's 10000mAh self-wired power bank is attached for your convenience.
The Xiaomi 10000mAh self-wired power bank has two colors: gray-blue and light coffee, which is more low-key and elegant than the traditional black and white color scheme. The power bank comes with an 18cm long USB-C charging cable, which supports charging mobile phones and also supports connecting to a charger to charge itself, which is easy to use. The power bank is also equipped with USB-C and USB-A interfaces, which are convenient for connecting different devices for charging.
Through dismantling, the charging head network learned that this power bank has a built-in Lishen 5000mAh polymer lithium-ion battery, and two pieces are connected in parallel to form a 10000mAh capacity. The SC8934 power chip of Nanxin Technology is used internally for fast charging output, and the modern single-chip microcomputer A94P829LUN protocol chip is used for control.
Among them, the built-in USB-C port uses Weizhao VS3640DE for VBUS control, and the rest of the interfaces are controlled by 8205T MOS tubes. Each interface inside the power bank is equipped with a TVS diode for electrostatic protection, the inductance and the MOS tube are glued and reinforced, and the corresponding battery side is pasted with foam glue for buffering, and the internal workmanship is solid and reliable.