Preface
LEIPURUI HAS LAUNCHED A POWER BATTERY PACK FOR POWER TOOLS, WHICH IS A BATTERY PACK OF 5 STRINGS 2 CONNECTED IN PARALLEL, WITH A TOTAL OF 10 POWER 18650 BATTERIES. The battery pack has a nominal voltage of 18V, a capacity of 6Ah, and an energy of 108Wh. The battery pack has a two-way USB-C port and a built-in two-way buck-boost chip, which supports charging through the USB-C port and can be used as a power bank.
With a common USB-C charger, you can easily charge the battery without the need for a dedicated battery charger. There is also an indicator light on the side of the battery pack to make it easy to grasp the battery status of the battery pack. The following charging head network will bring the disassembly of this battery pack, and let's take a look at the internal materials and solutions.
APPEARANCE OF LEIPURUI POWER TOOL BATTERY PACK
LEIPURUI's power tool battery pack adopts a pure black color + yellow industrial design style, a PC material shell with a fine grain matte texture, a rounded transition and a smooth feel.
The edge of the front mount of the fuselage is designed with a semi-circular slide rail, which is snap-on with the power tool base.
The yellow rubber core of the seat body is the contact power supply point, and the yellow rubber core has metal positive and negative PIN pins on both sides.
The groove next to it is protected by a rubber stopper, and the input and output parameters of the corresponding interface are printed 5-20V DC, with a maximum power of 65W.
There is a USB-C port under the rubber plug, which is compatible with mainstream USB-C charging cables.
From the side, this product refers to the shape design of a large transport vehicle, and the "18V LITHIUM-ION" and USB-C port parameter information are printed on both sides.
At the same time, you can see that there are also raised slide rails on both sides, which makes the connection more firm.
At the end of the fuselage, there is a battery level display area, with four LED matte indicators and an ON button.
The battery holder can click the on/off button to display the remaining charge.
There is a trip button at the other end, and there are also three raised designs for easy use.
There is also product nameplate information at the bottom, and the battery-related parameters are 18V 6.0Ah 108Wh, which has passed CE, UKCA, PSE certification.
The enclosure is encapsulated with conventional Phillips screws in the edge holes, which is easy to open.
The measured product body length is 115.6mm.
The width is 74.82mm.
The height is 61.06mm.
The size of the product in the hand is intuitively felt.
In addition, its net weight was measured to be about 591g.
Using ChargerLAB POWER-Z KM003C, this charger supports FCP, SCP, AFC, QC3+, PD3.0, DCP, and Apple 2.4A charging protocols.
PDO报文方面，具备5V3A、9V3A、12V2.5A、15V2A、20V1.5A五组固定电压档位。
PURPUR
After reading the appearance display of this power tool battery pack, let's disassemble it and take a look at the internal materials and solutions.
First, unscrew the screw-fastened housing and disassemble the battery pack.
Close-up of the battery buckle mechanism.
A glance inside the housing, where the battery is fixed in a plastic bracket and the PCBA module is connected by soldering.
The positive nickel sheet of the battery is connected by welding.
The voltage sampling of the battery cell is also connected by nickel strip welding.
The PCBA module is fixed on a plastic bracket with screws.
The small board of the power display is welded by wires.
Remove the battery pack from the case.
The spot welded nickel strip on the side of the battery pack is connected to the PCBA module.
The battery is secured and insulated using a plastic bracket.
The side of the battery is equipped with a button and a small LED power indicator plate.
The sides of the battery are welded together by nickel strips.
Solder to remove the PCBA module.
The front of the PCBA module is at a glance, the left side is welded with a bidirectional synchronous buck-boost circuit, the right side is welded with a battery protection circuit, and in the middle is the battery contact for connecting the power tool for power supply.
A thermistor is soldered on the back of the PCBA module.
The synchronous buck-boost controller of the USB-C interface adopts Yingjixin IP2368, the chip is driven by a built-in four-tube H-bridge synchronous buck-boost switch tube, supports PD3.0, AFC, FCP and other fast charging protocols, can automatically apply for fast charging to charge at maximum power, the input terminal supports 5-20V voltage, through the buck-boost voltage conversion, automatically switch the boost or buck, adjust the output voltage to charge multiple strings of battery packs, and also support a maximum of 100W reverse discharge output.
Yingjixin IP2368 supports the use of 2-6 battery packs in series, the battery is full of voltage to support resistance setting, and is suitable for lithium iron phosphate and ternary lithium batteries, which fully meet the battery types of different equipment. IP2368 supports four-lamp battery level indication by default, and the initial capacity of the battery pack can be configured through resistors to achieve accurate power display.
Yingjixin IP2368 data information.
Close-up of buck-boost magnetic ring inductor.
The synchronous buck-boost switch is from Guanyu, model KS3416NB2T, dual NMOS, withstand voltage 30V, conduction resistance 4.5mΩ, and PDFN5060 package.
The other switch tube is of the same type.
The filter capacitor at the battery end comes from Hongyuan Nachuan Electronics, and the specification is 100V35μF.
The USB-C interface filter capacitor specification is 100μF35V.
The battery protection chip comes from Saiwei Microelectronics, model CW1051, which is a secondary protection chip for 3-5 string batteries, and the chip has open wiring protection for battery overcharge protection.
A battery protection tube is from Guanyu, model KS4310, PMOS, withstand voltage 40V, conduction resistance 15mΩ, TO252 package.
Close-up of a standardless chip.
The USB-C receptacle is secured by via soldering.
Close-up of the interface used for battery and tool communication.
Close-up of the battery positive socket.
Close-up of the negative socket of the battery.
Close-up of a thermistor used to detect battery temperature.
Close-up of the small board of the power display, welding micro button and indicator light.
The battery is secured in a plastic bracket.
The battery is an 18650 battery with a gray skin.
The battery is an 18650 battery with a gray skin. (Zhihu exclusive)
A list of all dismantling and a family photo.
Summary of the dismantling of the charging head network
LEPURUI is a battery pack with 10 x 18650 batteries and a USB-C port that supports bidirectional charging and discharging. The measured charging power of the battery pack is about 45W, and the output supports 30W fast charging, and the battery can be fully charged in 2 hours with the PD charger. While being used as a battery for power tools, it can also be used as a power bank to power mobile phones and laptops, with comprehensive functions.
Through the dismantling of the charging head network, it was learned that this battery pack has a built-in Yingjixin IP2368 synchronous buck-boost converter, which is used for USB-C interface input to charge the battery, or output discharge through the USB-C interface. The inside of the battery uses a Guanyu MOS transistor for buck-boost and protection functions, and a solid-state capacitor is used for filtering. The battery is protected by CW1051 and equipped with a thermistor for temperature protection, and the battery is insulated and fixed with a plastic frame, with solid and reliable materials and workmanship.