Introduction

We have obtained a power bank from Bull that utilizes a semi-solid-state battery. A semi-solid-state battery is a lithium-ion battery that incorporates a solid-state electrolyte while retaining a small amount of liquid electrolyte to maintain ion conductivity. With less liquid electrolyte used, the battery is less prone to leakage under extreme conditions such as punctures, compression, or drops, significantly reducing the risk of short circuits and fires originating from the battery. Additionally, the improved thermal stability enhances the overall safety. On the other hand, the reduction of liquid electrolyte also leads to fewer side reactions, which generally results in a longer cycle life for semi-solid-state batteries.

Next, we will disassemble this power bank to examine its internal structure and material design.

Product Appearance

The front of the packaging features the Bull logo along with an image of the product's appearance.

The back of the packaging contains information such as product specifications, retailer details, and important precautions.

A USB-A to USB-C charging cable is included in the package.

The power bank features a light beige color scheme. The top section of the front has a display screen, with the BULL logo printed below it.

The digital display screen shows the remaining battery level of the power bank.

The back of the power bank displays the parameter information.

Model: GNV-PGA10EB

Battery Capacity / Rated Energy: 10000mAh / 37Wh

Rated Capacity: 5600mAh (5V2A)

Input Parameters (IN): 5V2.4A, 9V2A

Output Parameters:

OUT1 / OUT3: 5V2A, 9V2A, 10V2.25A (Max), 12V1.5A

OUT2: 5V2A, 9V2.22A, 10V2.25A (Max), 12V1.67A

Multi-port Output: 5V2A (Max)

The side features a power button.

The top houses two USB-C ports and one USB-A port, with the middle USB-C2 supporting both input and output.

The length of the power bank is about 145.2 mm (5.72 inches).

The width is about 69.08 mm (2.72 inches).

The thickness is about 16.7 mm (0.66 inches).

ChargerLAB POWER-Z KM003C shows that the USB-C1 supports QC3.0, FCP, SCP, AFC, DCP, SFCP, and Apple 2.4A charging protocols.

The USB-C2 supports PD3.0, PPS, QC4+/3.0, FCP, SCP, AFC, DCP, SFCP, and Apple 2.4A charging protocols.

And it has three fixed PDOs of 5V3A, 9V2.22A, and 12V1.67A. It also has two sets of PPS, which are 5-5.9V3A and 5-11V2A.

Using the KT002, it was measured that the USB-A port supports charging protocols such as Apple 2.4A, Samsung, QC3.0/2.0, AFC, SCP, and PE2.0.

Teardown

Next, let's take it apart to see its internal components and structure.

Pry open the bottom panel along the seam. The bottom panel is secured by clips.

The injection-molded text indicates that the material is PC (polycarbonate), which is highly flame-retardant, has good toughness, impact resistance, and relatively good heat resistance.

The battery cell is wrapped in a silver aluminum-plastic film, with yellow insulating tape applied along the edges for added protection. Around the corners, white glue can be seen, used to secure the cell in place within the casing. This helps prevent movement of the cell inside the housing while enhancing shock resistance and abrasion protection.

The semi-solid-state battery cell is supplied by GPC, with a specification of 1260110. It has a nominal voltage of 3.7V, a capacity of 10000mAh, and an energy rating of 37.0Wh. The cell has also passed CCC certification.

The thermistor is affixed to the side of the battery cell using yellow high-temperature insulating tape.

The front of the PCB features an alloy inductor, the master control chip, a battery protection chip, a battery protection MOSFET, and the MCU.

The back of the PCB contains VBUS MOSFETs and the digital display module. The battery cell is connected to the PCB via nickel sheets welded at the points.

The battery protection chip is marked with DW01. This is a lithium battery protection IC that provides over-discharge, over-charge, over-current, and short-circuit protection functions.

The battery protection MOSFET is marked with 33500.

The master control chip is from iSmartWare, model SW6208S. This is a highly integrated, multi-protocol bidirectional fast charging IC designed specifically for power banks. It supports fast charging on any port (A+A+B+C+L5). The chip integrates 5A high-efficiency switch-mode charging and 24W efficient synchronous boost output.

The SW6208S supports switch-mode charging up to 5A with an efficiency of 96%, features synchronous boost capabilities, and provides an output power of up to 22.5W. It includes automatic load detection, supports wireless charging and low current modes, ensuring efficient charging. The chip is compatible with multiple protocols, including PPS, PD3.0, and QC3.0, making it suitable for a wide range of devices.

The SW6208S also integrates a Type-C interface, BC1.2 module, battery measurement and display functions, a 188-segment digital display, button support, and comprehensive protection mechanisms, providing users with convenience and safety. Its I2C interface and compact QFN-48 (6x6mm) package make it easy to integrate into various applications, making it an ideal choice for power bank designs. It offers powerful features and outstanding performance for the product.

The boost inductor is made of alloy, with an inductance of 2.2μH. It is secured with white encapsulation around it for heat dissipation.

The VBUS MOSFETs are from DP, model DP8205. They are dual NMOS transistors with a voltage rating of 20V, an Rds(on) of 29mΩ, and come in a SOT23-6 package. One of these MOSFETs is used for the USB-A interface, while the other is used for the USB-C2 interface.

The VBUS MOSFET used for USB-C1 is also the DP8205.

The MCU is used for overall system control, but the specific model is unknown.

Close-up of the R005 current sampling resistor.

The thermal conductive blocks are used to dissipate the heat generated by the alloy inductor.

Well, those are all components of the Bull 22.5W 10000mAh Semi-Solid State Power Bank.

Summary of ChargerLAB

Here is the component list of the Bull 22.5W 10000mAh Semi-Solid State Power Bank for your convenience.

The front features a digital display screen that shows the remaining battery level. The battery capacity is 10000mAh, and the device is equipped with 2 USB-C ports and 1 USB-A port. Among them, USB-C2 supports both input and output. USB-C1 and USB-A are compatible with protocols such as QC, SCP, AFC, etc., while USB-C2 supports PD3.0, PPS, QC4+, and other protocols. The maximum output per port is 22.5W, but when multiple ports are used simultaneously, the output is limited to 5V2A.

After taking it apart, we found that its semi-solid-state battery comes from GPC, with a capacity of 10000mAh. The semi-solid-state battery significantly reduces the amount of liquid electrolyte and incorporates a solid-state electrolyte, offering enhanced safety, thermal stability, and durability. It uses a battery protection chip paired with a battery protection MOSFET, providing multiple layers of protection against overcharge, over-discharge, overcurrent, and short-circuit risks.

The master control chip is the iSmartWare SW6208S, which handles key functions such as switch-mode charging, synchronous boost, and multi-protocol control all within a single chip. The VBUS MOSFETs are the DP DP8205 dual NMOS, used for power path control of the USB-A and two USB-C ports, helping to manage reverse current and output regulation. Additionally, the back features thermal conductive blocks to dissipate heat from critical components, showing attention to detail in thermal management.

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