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Release date：2016-11-21 Views：2017
Half a year ago, Nanfu launched a rechargeable nf-n25, which uses a single 18650 lithium battery. It is also known as the aluminum lipstick. It has a capacity of 2500mah. It is small and portable, and it is very popular. Recently, Nanfu has quietly launched a new single section charging bank in tmall's flagship store: nf-x35, with the capacity upgraded to 3350mah, and the input and output performance has been doubled to 2a, which can meet the high current charging needs of acute sub users, which can be called the small steel gun in the mini power bank. Let's take a look at the internal workmanship and performance of this new product.
Nanfu Xiaojia Mini charging treasure frequency conversion X35 outer packaging color selected chocolate color.
On the side is the product features of Nanfu Xiaojia mini power bank.
Push out the surface cover.
Open the corrugated box to see the body of the power bank.
List of unpacking items: instruction manual x1, power bank body x1, same color data line x1.
Nanfu Xiaojia mini power bank is very small in size. Compared with the traditional block power bank, it looks like a biscuit in the hand. The color of vibrant orange is selected, which makes it very comfortable. The surface of the product is sprayed with touch paint, which is antiskid and does not touch fingerprints. It is close to the skin when held on the hand.
How small is the size? In order to make it more intuitive, Xiaobian took a cigarette box as a comparison. The length, width and height of the cigarette box were 90mm x 30mm x 23mm. When placed with the cigarette box, it could be seen that the volume was only half the size of the cigarette box.
The net weight of the power bank body is 73.52g. Compared with those products that can be easily divided into two or three hundred grams, Xiaojia can be said to be "as light as a feather".
All the I / O interfaces are installed on the top of the charger, conventional micro USB input interface and usb-a output interface.
The bottom is printed with the product name plate parameters of Nanfu "Xiaojia", product name: frequency conversion charger, model: nf-x35, cell capacity: 3350mah, rated energy 12.40wh/3.7v, input and output performance: 5v2a (maximum).
Four power indicator lights and switch buttons are installed on the top panel, which is very valuable on a single charging bank. Looking at other similar products, there are not many of them.
With the mobile phone with the scene, in front of such a small power bank, the mobile phone with a 5.7 inch screen looks like a big Mac.
Nanfu Xiaojia mini power bank frequency conversion X35 adopts all plastic shell design. The bottom shell is bonded with the shell through ultrasonic welding, and the shell can be opened without damage by gently tapping.
The king of mini power bank: Nanfu Xiaojia frequency conversion X35 disassembly evaluation
After disassembling and opening the shell, the ultrasonic welding trace after the bottom cover edge is inserted into the shell can be seen.
A single LG 3350mah 18650 cell is selected for the battery, and the cell voltage sharing platform is 3.63v, which is commonly known as F1L. Because of its balanced capacity and suitable price, LG F1L has obtained orders from various manufacturers after it comes into the market. Three sections can make up 10000mah, and six sections can make up 20000mah. This kind of cell can be seen in middle and high-end power banks of all brands.
Ultra soft high temperature resistant silicone wire is used for battery welding wire. NTC thermal probe is directly buried on the battery body, so the temperature measurement protection is more accurate.
Using highland barley paper as insulation treatment for the positive electrode of the cell can greatly reduce the hidden danger.
Why does highland barley paper reduce the potential safety hazard? This is because the safety distance between the 18650 positive electrode cap and the negative electrode shell is only a few millimeters. Although the 18650 factory has used white insulation gasket to isolate the positive and negative poles, and then seal the heat shrinkable skin for insulation treatment, there may be hidden dangers after transportation bumps and installation and pulling. For the sake of safety, responsible manufacturers will use highland barley paper for secondary insulation on 18650, which is the greatest possibility Security.
There is no possibility of short circuit in the negative electrode, so highland barley paper is not needed. The spot welding method of nickel strip is 2 + 2, and the solder joint is firm without perforation.
Further disassembly, double-layer PCB structure, the middle through the row of pins welding conduction, this is also in the narrow space to provide the maximum space utilization, because there are four sides, in order to distinguish easily, the following uses notebook mode ABCD side to distinguish each side of the PCB.
Two PCBs are separated from the lower row of pins, which are the C-side and A-side after separation.
This is the D and B planes after separation.
On the right bottom of the d-side PCB are four white power display LEDs, where a light shielding sponge is pasted to avoid cross light impact on identification. On the bottom left is the SMD switch button. Through the through-hole solder joint at the bottom of the micro USB base, you can see that the bent foot at the bottom of the microusb with positioning post is inserted into the PCB for welding, which is more firm and durable than the ordinary micro USB base.
There are no components on the C side, only the micro USB female base and pin connector.
The 8-pin screen printing 1322 on a side is the battery integrated protection board, and the screen printing NTC is the thermal probe pad. When the battery is overheated, the input and output will be cut off to ensure safety.
Side B is the most critical IC of the whole PCB. The following figure is enlarged to introduce it.
Yingjixin ip5209 is an integrated solution chip with charging and discharging as well as self identification function. It supports 3A charging and 2.4a discharging, with an efficiency of 91%. It integrates 14bit ADC, supports NTC thermal probe, provides power display support, and is used with the integrated protection board above to minimize PCB volume and wiring difficulty under high performance. In the past tests, ip5209 is a very good chip.
In the conventional 5V output current step test, the starting no-load standby voltage is 5.16v, the ending voltage is 4.83v, the maximum output current is 2.7A, and the maximum output power is 13W, which is far beyond the nominal value of 5v2a. The output is smooth curve between 0 and 2.6a. The voltage keeps at 4.95v, and the voltage drops slightly to 4.83v at 2.7A, which is still available voltage. This performance is very fierce for a small volume of single section, and the basic full range voltage is maintained above 5V, which is completely usable.
The energy of LG F1L cell used by Nanfu Xiaojia Mini charger is 12.40wh. According to the nominal input parameters, it can be inferred that the charging time is about 2 hours. Next, monitor the whole charging process from 0% to 100% to see what the actual charging time is.
In the diagram, blue represents input voltage and green represents input current. The whole charging process takes 2 hours and 13 minutes. It can be found that the maximum charging current reaches 2.04a in the constant current stage of CC, which exceeds the official nominal value, and then turns to CV constant voltage stage, and the current begins to decline.
In the graph, we also found an off-line detection algorithm. What is offline detection? In the end of the charging process, the charging is stopped every interval to detect the no-load voltage of the cell. After using the off-line algorithm, the control chip can control the cell voltage more accurately. Nanfu Xiaojia mini power bank inverter X35 is the first single charging bank to use offline detection.
When the data of charging process is transformed into the percentage of input energy, it can be seen that the saturation is 70% in one hour at high current stage, and then the percentage slope slowly reaches 100%.
The discharge time of 5v1a is 2 hours and 03 minutes, the discharge voltage is 5.0V, the total energy is 10.29wh, and the efficiency value is about 82.98% based on the nominal total energy of 12.40wh.
The discharge time of 5V 2a is 52 minutes, the discharge voltage is 5.0V, and the energy released at the end of discharge process is 8.66wh, and the conversion efficiency is about 70% based on the nominal total energy of 12.40wh.
It is necessary to mention that Nanfu Xiaojia mini power bank adopts a single 18650 cell of 3350mah, which belongs to a small capacity power bank. When 5v2a is output, it is equivalent to 1C high rate discharge (the national standard is 0.2C). The test data are only for reference. As a single portable power bank, the constant current output of Nanfu Xiaojia mini power bank 2A reaches 70% efficiency, which is good.
What's more, it is worth mentioning that the voltage is very stable in the whole process of discharge even under the condition of 2A high rate discharge. The voltage at the end of the discharge is not weak, and the voltage is kept at 5V from the beginning to the end, which is hard to meet in a single charging bank.
So what about charging your phone? This paper selects several popular mobile phones in the market to test, and the test is defined as 5V conventional input voltage mode. From the compatibility test summary list, we can see that Nanfu Xiaojia mini power bank can identify the mainstream popular mobile phones and charge with the power close to the full load of the mobile phone, showing excellent compatibility performance. In particular, Nanfu Xiaojia mini power bank supports Apple's full range of products, such as iPhone and iPad tablet, which can be well compatible and get high current charging.
In the input compatibility test, all the common chargers also support the charging of Nanfu Xiaojia mini power bank. The 0% initial charging power has exceeded 8W (1.6A +). Through the above monitoring of the whole charging process, it can be known that the charging power will slowly rise to 10W (2a) in the middle and later stages, which can reach the nominal input power without false standard.
According to the official PDF of LG F1L, the full discharge voltage of the cell is 4.5V and the full charge voltage is 4.5V. The energy utilization and saturation are very high, and the judgment of shutdown is very accurate.
Evaluation summary:
Nanfu Xiaojia mini power bank frequency conversion X35 is not the first single cell power bank of Nanfu, but the latest achievement of Nanfu after several generations of product and technology iterations. This mini power bank adds two-way fast charging to the same type of products, bringing the single cell power bank to a new height. Although he is small, he has amazing performance. In the era of mobile Internet, many users have more than one power bank. The large size and large capacity of 10000mah and 20000mah represent one development direction of the power bank, while the frequency conversion X35 of Nanfu Xiaojia mini power bank represents another development direction of the power bank. For example, if you suddenly leave the house temporarily and your mobile phone is out of power, although 20000 MAH can fully meet your needs for charging and battery life, it is enough to charge once for daily use. Why choose a large one with hundreds of grams? Small partners who have strict requirements on size and weight choose to bring Nanfu Xiaojia mini power bank when they go out for a short time, which gives consideration to both endurance and portability.
(1) In terms of output, the integrated synchronous rectification scheme with built-in British chip ip5209 provides a super output power of 5V 2.7A 13W, which can be called Hercules in a single charging bank. The input and output power can reach or even exceed the official nominal parameters, which is rare in the industry.
(2) In terms of charging, the measured current can reach 2a, and the whole charging process only takes 2 hours and 13 minutes. In addition, the off-line detection voltage algorithm is added to the charging algorithm, and the full power cut-off voltage is 4.201v, which is very accurate.
(3) In terms of design, Nanfu Xiaojia mini power bank has an activation button and four power display LEDs on the body, which makes it more intuitive to use, and the remaining power does not need to be guessed. The net weight of the chocolate main engine is only 73g, and the use of LG F1L 3350mah single cell high-density cell can always provide you with an emergency endurance guarantee without being cumbersome.
(4) In terms of safety, it is equipped with NTC thermal probe, cell core, proper use of highland barley paper to put an end to hidden dangers, chip monitoring of charging and discharging current, voltage and temperature, to ensure the use of safety in the whole process.
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