Mobile Phone 1S, 3.7V, 1.5A Flexible Circuit PCM Protection Module Board for Lithium-ion Battery Pack with NFC Communication

Digital Product Protection Board (FPC) Flexible Circuit PCM Protection Module Board for battery

● Working current: 0.5-5A, reaching 10A in an instant;

●Basic functions:

2 charging overvoltage protection 4.20V-4.465V, charging overcurrent protection, charging high and low temperature protection -20 degrees - +50 degrees;
2 discharge overvoltage protection 2.5V-3.0V, discharge overcurrent protection, discharge high and low temperature protection -20 degrees - +65 degrees;
2 short circuit protection;
2 secondary protection;
2 0V charging;
2 automatic sleep;


●Maximum imposition size: L (150mm) * W (135mm) * T (0.15mm);

●PCB type: FPC full soft board, soft and hard board, soft + hard board;

● Copper thickness 0.5OZ (18um), 1OZ (35um);

● Layer: double panel, four layer board (hard board)

●Ink color: butter, black oil, red oil

● Reinforcement method: FR-4, steel sheet, PI

● Pad processing: Shen Jin, OSP;

●With plastic rolled copper, no rubber rolled copper, rubberized electrolytic copper, glueless electrolytic copper

●Golden fingers: bright gold, semi-bright and half-dumb, full dumb gold;

●Applicable environmental requirements: ROHS, REACH, halogen-free, 7P;

●Applicable equipment: applications and mobile phones, tablets, MP3/MP4, digital cameras, Bluetooth headsets, motor drive boards, intelligent robots and other products.

FPC cable welding solution

Pulse welding machine (soldering) JYPC-3A inter-unit equipment

The main function of this machine is to weld flexible printed circuit, flexible flat cables and various flex cable, as well as various terminal cables. This machine is a rotary welding machine, which can be used alternately for two fixtures, which can save half of the time and improve work efficiency.The output of this machine is stable and adjustable. It is composed of SMC pneumatic components, which are precise and digitally displayed. The temperature and time parameters are input from the operation panel. The temperature setting range is 0-500 degrees, and the time setting range is 0-99 seconds. This is the three major elements of welding a product.

Product welding schematic:

Welding process:

Step 1: Put the product into the fixture and position it at the same time. 

Step 2: Press the two-hand system to start the welding

Step 3: Turn the turntable to the position of the weld and wait for the presser to press down. 

The fourth step: the welding head is pressed down, and the hair is heated. 

Step 5: Wait for the welding to complete and return to the first step.

Welded FPC Gold Pins Design Tips

There can be more than 100 circuits with thickness of 0.2mm in one fpc cable. Although it is more expensive than wire cables, it is widely used in compact smart hardware. Especially for mobile phones, smart watches and other scenes.Today’s topic is design skills of the welded FPC.

Double-sided gold finger + tin hole

We have to design double layer gold pins although they corresponds to only one layer of pad, .FPC is a non-metallic substrate with very slow heat transfer. If there is only one layer of gold pins, the heat transfer of the soldering iron can not be soldered when soldering by hand.Similarly, the tin holes on the pads are also designed to transfer heat and allow the molten solder to flow between the upper and lower layers.


Darlox combines business capabilities and industry chain upstream and downstream to provide customers with one-stop services from Schematic Design, PCB/FPC Fabrication, material purchasing, welding processing, packaging testing.