This post was last edited by yaoquan5201314 on 2022-5-22 18:57
First of all, I would like to thank EEWORLD for giving me the opportunity to disassemble the Anker power bank. I know that opportunities are rare, so when I received the power bank, I carefully studied the relevant charging function parameters, and monitored the recharging status in real time during the full charging process. After fully charging, I charged the mobile phone to test the discharge performance. After doing all this, I started to disassemble the power bank. I found it difficult to disassemble. I broke the tools and it took almost an hour to disassemble it violently. The following is the whole process of disassembly:
First look at the parameters of the official website:
From these parameters we can see that the power of this power bank is 10000mAh, the rated capacity is 6400mAh, and the back of the power bank is engraved with the lithium battery capacity of 5000mAh. I don’t quite understand the difference between these three parameters. Can anyone who knows the difference analyze it for me?
After receiving the power bank, I unpacked the express package. The appearance of the power bank packaging box is as follows:
The above are photos of the back and front of the power bank. Open the box and you can see the power bank, two manuals, a certificate of conformity, a TYPE-C to TYPE-C charging cable, and a mesh storage bag, as shown below:
The phone in the first picture is my Honor 9X phone. It can be opened to see the power bank, which is very small. And because the corners are relatively smooth, it can only be placed flat as shown in the picture, and cannot be placed at other angles. Then in the third picture, one of the instructions says that you can turn on the trickle charging mode by pressing the case twice in a row. I didn’t quite understand it at first. I just saw in the product details that this function is to charge Bluetooth headsets and other devices that require low current charging, and then disconnect the charging after two hours. I usually charge Bluetooth headsets like mobile phones, and I have never thought about charging them through this low current charging method. I wonder if any netizens know the difference between this trickle charging method and the normal charging method?
The uploading of pictures has been stuck, maybe the network is not very good. It’s too late now. I’ll see if I can finish it during the day tomorrow.
After unpacking the bag, you can see the front and back of the power bank as shown below:
There is a round button above the front picture. The round button integrates four blue power indicator lights. Pressing this button can display the battery power through the four blue indicator lights. The ANKER brand is printed below the button.
On the back are some electrical characteristic parameters of the power bank, three of which are interesting: battery capacity: 10000mAh, lithium battery energy: 5000mAh, rated capacity: 6400mAh. I don't know what the relationship is between these three parameters. It feels like a word game.
Then the other charging and discharging parameters are consistent with those written on the product details page.
Then use the PCB multi-function ruler to measure the size of the power bank, as shown below:
The measured length, width and height are 105mm, 50mm and 25mm respectively.
The following two pictures show the charging and discharging interface and charging cable of the power bank:
You can see that USB-A is the output interface, USB-C is the input and output interface, and both ends of the charging cable have TYPE-C interfaces. I don’t think it is very practical, but I have bought Anker’s gallium nitride charging head before, and this charging cable should be suitable for gallium nitride charging heads.
Now I started to charge the power bank with my Honor 9X original charger, as shown in the following figure:
You can see that this charging head supports 5V2A charging. Then connect the charging head to my PD tester to charge the power bank, as shown in the following figure:
When charging just started, only one indicator light was flashing on the power bank. At this time, the battery capacity of the power bank should be less than a quarter. The charging voltage and charging current were 5.28V and 1.84A respectively. It felt that the current of the power bank did not reach 2A. The capacity of the power bank displayed was 2030mAh.
The following two pictures are photos of the charging status of the power bank before it is fully charged:
It can be seen that the battery power is increasing, but the charging current is still relatively stable.
The following picture shows the charging status of the PD tester after it is fully charged:
You can see that the battery power is 9396mAh, which is close to the 10000mAh written on the power bank specification. The charging current is also close to 0A. At this time, the power bank has just been fully charged, and all four power indicator lights of the power bank are displayed.
The picture below shows my Honor 9X charging with a charger:
It can be seen that the charging current is 2.14A. After comparison, it can be seen that when using the same charger to charge this Anker power bank and my Honor mobile phone, the charging current of the power bank is smaller than the charging current of my mobile phone. The power bank does not actually achieve fast charging performance.
Let’s take a look at how to charge my Honor phone with a power bank, as shown below:
As shown in the picture above, we can see that the discharge current of the power bank is only 1.37A, which is not as high as the charging current of my mobile phone. Therefore, the discharge of this Anker power bank does not meet the fast discharge characteristics.
After testing the charging and discharging characteristics of the power bank, we started to disassemble the power bank. After observation, we found that there was a gap under the front cover of the power bank by prying it open. As shown in the figure below:
The disassembly process was quite laborious. It took nearly an hour and the disassembly tools were broken. Because the corners of the power bank were relatively smooth and difficult to fix, it was difficult to exert force during the disassembly process and I almost hurt my hand. It took nearly an hour to disassemble it. I found that there was a strong double-sided tape between the battery and the back cover, as shown in the following figure:
In addition to a circle of double-sided tape on the battery, there is also a layer of black glue in the middle of the double-sided tape. I heard from my structural colleagues that this should be 3M glue, and it should have a heat dissipation function.
Then the front cover near the battery is not only covered with 3 kinds of glue, but also with a circle of copper foil, which can shield interference signals.
The power bank consists of two circuit boards, one of which is the battery positive and negative pole adapter board, and the other is the charge and discharge control board. The charge and discharge control board is disassembled as shown in the figure below:
This is the side of the main control board close to the front cover. In addition to the USB-A socket, USB-C socket, large inductor, and SMD aluminum electrolytic capacitor, there are several ICs. The main control IC is Nanxin's SC20010DER, which is packaged in QFN-32. This is a USB PD controller that integrates multiple fast charging protocols. It complies with the latest USB Type-C and PD 3.0 standards and supports the most popular high-voltage fast charging protocol, supporting up to 4 groups of DPDM interfaces. It is used in mobile power supplies and other mobile devices. SC2001 supports an extremely wide operating voltage range of up to 30V, without the need for additional LDO. By integrating the USB PD baseband physical layer (PHY), Type-C detection, voltage and current detection, 10-bit DAC VBUS regulation, 10-bit ADC, voltage reference, VBUS voltage discharge path, NMOS driver, I2C interface and protection circuit, the external devices are minimized, the system design is simple, and the BOM cost is low. Its embedded microcontroller and 32kb MTP provide highly flexible and cost-effective solutions for many applications. SC2001 supports multiple protection mechanisms, including overvoltage protection, undervoltage protection, overcurrent protection, short circuit protection, overtemperature protection, DP/DM pin overvoltage protection, CC pin overvoltage protection, etc., effectively ensuring the stable and reliable operation of the system.
The following figure is a typical application circuit diagram:
The second IC is silk-screened with M3017AM and packaged in SOP8. After checking, I found that this is a USB-C interface output VBUS switch tube. I couldn't find the specification and manufacturer's name. I guess this is used to switch the USB-C input and output direction. If anyone knows, please help analyze it.
The third IC has the silkscreen 8810PA. There are two of them and the package is SOT23-6. I can’t find any information about it online, so I don’t know what it is used for.
The fourth IC's silkscreen is 21ALQ and the package is DOT23-5, but no information was found for this.
Because of the poor pixel of the mobile phone, I could only take close-ups of the four ICs as shown in the figure below. Except for the first main control IC, I could not find detailed information on the other three. For the second IC, I only saw a simple function introduction in other review articles, and I also could not find a manual.
Then there are two black wires under the main control board that are connected to the thermistors on the battery positive and negative adapter board to monitor the battery temperature.
The following figure is the back view of the main control board:
The back of the main control board mainly has a SMD mechanical button and a small number of SMD capacitors and resistors.
The following picture is the silk screen picture of the power bank battery:
According to the silkscreen on the battery, it is composed of two 5000mAh 3.7V lithium batteries connected in series to produce a 7.4V output. However, the silkscreen on the battery does not allow us to find the battery supplier or specifications.
Let me briefly summarize this disassembly. First of all, this power bank disassembly activity is the first disassembly activity I have participated in. Although I have disassembled several products and learned circuit design because of work needs, they are all related to my work products after all, and the integration of PCB boards is not that high, so it is relatively easy to understand the schematic design and familiar with related components. However, this power bank disassembly made me feel that the hardware technology of fast charging and discharging of power banks is still highly integrated, and I feel that there are still many things to learn. Usually, my work is mainly single-cell lithium battery charging and discharging control, and up to four-series and two-parallel lithium batteries. But it is mainly slow charging and slow discharging mode, so I don’t know much about fast charging and discharging of lithium batteries. Then, while searching for information on these ICs, I discovered that there were a lot of disassembly of related chargers and power banks on the charger head website, and they were all very professional and detailed. After reading a few disassembly and evaluation articles on the charger head website, I felt that there was a big gap between me and others. To be honest, I was still very nervous when I took the time to write this disassembly and evaluation these two days. After all, there were so many great examples before, and I felt a lot of pressure. So I have been trying my best to write better, but the more I write, the more I feel that I am not well prepared and my understanding of related technologies is not enough.
The above is my summary of the disassembly process. The following is a summary of this Anker power bank:
First of all, after the actual charging and discharging test, this Anker power bank feels not worthy of its name. It does not achieve fast charging and discharging performance. It is not as fast as my mobile phone, and the power bank discharges even slower. So in general, the price of 189 yuan when applying for the evaluation is still a high premium. It is not as good as the 20,000mAh Xiaomi power bank and the ROMOSS 2000mAh power bank I bought before. The price of these two power banks is just over 100 yuan, and the charging and discharging speed is about the same as the original charging head of my mobile phone. So I think this Anker power bank, plus the brand premium, is only worth 100 yuan at most. I didn’t expect to see this Anker power bank on JD.com increase in price to 225 yuan when I was writing the review these two days. It really blinded my eyes. I really can’t understand why this power bank dares to sell so expensively. Is it because it is the number one in sales of overseas power products, and then it is designated by Apple as a cooperative charger brand, and it is gold-plated overseas, so it is sold so expensively? Anyway, I won’t buy such an expensive power bank, or the ROMOSS power bank in my hand is fragrant.
The above is the summary of this review. Finally, I would like to thank EEWORLD for giving me this review opportunity. I feel that this review is barely qualified. On the one hand, I am busy with work. I have been disassembling the power bank for a month before I have time to write the review article. On the other hand, I don’t have enough relevant technical reserves, so I always feel that something is lacking when writing the review article. I hope to learn more excellent review articles in the future, especially disassembly review articles. Thank you for your browsing!
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