Power Bank PCB Assembly - KingSheng PCBA

Power banks are an excellent power source when you're away from home. This convenient and portable device can charge your phone multiple times. Although power banks have many uses, this article is tailored for those who manufacture power bank circuit boards or those interested in building their own power banks.

What is a Power Bank Circuit Board?

A power bank printed circuit board (PCB) is a silicon chip that serves as the mainboard of the power bank. When assembled, a power bank PCB has power input and output points, capacitors, diodes, and other components that enable it to store charge in the batteries and discharge it when needed.

The power bank circuit board is crucial for the device's functionality. It acts as a central mediator between the batteries and your mobile phone, making it the most essential component of the power bank.

Types of Power Bank Circuit Boards

1. Single-Layer PCB

This is the most common type of PCB and is often the most sensible choice for power banks. A basic power bank typically includes a micro-USB female connector, various connectors, a couple of LEDs (to indicate the remaining battery and charging status), a few resistors, capacitors, and diodes. These components can be easily assembled on a single-sided PCB, which helps reduce costs.

2. Rigid PCB

Using a rigid PCB in power banks makes perfect sense because it can withstand heavy loads. Power banks go through rigorous charge and discharge cycles, so creating a charge/discharge module with a rigid PCB is a smart idea.

A power bank's PCB assembly generally includes a shell, battery, and circuit board. The power supply shell provides protection, aesthetic appeal, and other functionalities. The battery cell and circuit components mainly consist of a lithium core capacity indication circuit, a charging management circuit, a Battery Management System (BMS), and a DC-DC boost circuit.

The lithium core capacity indication circuit includes a voltage monitoring chip and an electronic circuit. The charging management circuit utilizes a battery charging management chip. The BMS features overcharge protection, over-discharge protection, and over-temperature protection. The DC-DC boost circuit employs an integrated chip for DC switch control, maximizing the release of lithium core capacity within safe limits to power various digital devices.