18650 Lithium Battery Protection Board

The Lithium battery protection board is a small size board that provides protection against short-circuit, overcharge and overdischarge. The board comes with pre-soldered Nickel strips which makes it a ready-to-use module with 18650 cells.

 

Features and Configuration 

This section discusses some of the important features and specifications of the lithium battery protection board.

1. Overvoltage protection limit: 4.2V DC
2. Undervoltage protection limit: 3.0V DC
3. Allowable current: 5A
4. Over-charge and Over-discharge protection
5. Pre-soldered Nickel strip for ready to mount on battery device

 

Pin Configuration 

The Li-Ion protection board is a simple module with basic input and output pins. The table below shows all the pin types and their functions.

Pin Type	Pin Description
B+	Battery Positive terminal
B-	Battery Negative terminal
P+	Positive Output
P-	Negative Output

 

Circuit Diagram and Working 

The module DW01 is a battery protection IC designed to protect lithium-ion/polymer batteries from the following Overcharge, Over-discharge, Overcurrent, and Short circuit.

 

The package requires fewer components to perform protection. In addition, the small package is perfect to fit in any given space of the battery.

The chip is equipped with two protection pins, OD and OC, which are responsible for over-discharge and overcharge, respectively. The pins are connected to two N-channel MOSFETs. These MOSFETs are responsible for controlling and handling the protection of the battery. Three used cases can be explained as follows.

 

1. Overcharge - In the case of overcharging, the DW01 controller disconnects the MOSFET connected at OD, allowing it to completely disconnect the battery. This typical example not only protects the battery but also protects the circuit connected (if any).

 

2. Over-Discharge - n the case of over-discharging, the DW01 controller disconnects the MOSFET connected at OD, allowing it to completely disconnect the battery. This typical example not only protects the battery but also protects the circuit connected (if any).

 

3. Short Circuit - When there is a short circuit, the DW01 completely isolates the battery and protects the battery from getting damaged. This also restores the power within seconds, allowing the circuit to be back in function when the short circuit is removed.

 

Alternatives

HX-2S-A2 Circular, TP5100

 

Applications

Here are some of the applications of the Li-Ion Battery protection board.

1. Mobile phone's battery
2. Toy Cars
3. Battery management systems

 

2D Model

Below is the 2D model of the Li-Ion battery protection board along with its dimensions in millimeters. The following information can be used in order to design custom footprints of the module and used for PCB designing and CAD modelling.