Battery design of water quality monitor

September 15, 2022
Latest company case about Battery design of water quality monitor

Citation: (key words: 18650 lithium-ion battery) the field water quality monitor is a portable water quality measurement equipment, which can test the quality of water resources and is a new environmental protection product launched in recent years. For the design of reliable mobile power supply, Sanyo 18650 lithium-ion core is the best choice.
1. Design requirements:

The field water quality monitor is a portable water quality measuring equipment, which can test the quality of water resources and detect the degree of water pollution. The main power consumption part of the instrument includes small electric pump, mixer, heating device, sensing and display part. The instantaneous current when the equipment is started is large, the peak value can reach 20a, the normal operation can reach 4-5a, and the battery can be connected For more than 4 hours of continuous work, our company specially designed a portable high-capacity lithium-ion battery with Sanyo battery. The battery has the characteristics of small size, high capacity, light weight and long service life. The design output starting current can reach 30a, the continuous working current can reach 7a, and the charging capacity is 20.4ah. Fully meet the working power requirements of the instrument.

2. Design scheme:

1) Protection board (PCM): the safety performance of the battery is usually the most concerned problem of the customer. Due to the chemical characteristics of the lithium battery itself, the protection board of the battery is equipped with safety measures such as overcharge protection, over discharge protection, over current protection, short circuit protection and over temperature protection to ensure the safety performance of the battery in use, so as to avoid the unexpected combustion, explosion and other hazards Risk.

2) Battery protection chip IC: the main protection function chip of the design scheme, which can monitor the overcharge, over discharge, over current, short current and other functions of the cell on-line at any time. Make the core work in a safe, stable and efficient range.

3) ICR18650 Li ion cell / ICR18650 Li ion cell (Sanyo).

4) Field effect transistor (MOS-FET): directly controlled by the protection chip in the circuit, it plays a switching role in the process of charging and discharging.

5) Battery pack packaging: environmental friendly halogen-free PVC heat seal.

6) Schematic diagram of design scheme:

野外水质监测仪设计方案原理图

7) Design scheme PCB top level diagram:

野外水质监测仪设计方案PCB顶层图

3. Realization diagram of battery products of field water quality monitor: