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11.1v 20Ah Lithium ion Battery Pack Analysis

Shenzhen Sinoli Electronic Co.,Ltd | Updated: Mar 16, 2019

Introduction: With the rapid development of modern society and the increasing lack of water resources, monitoring and protection of water resources has become a global common topic. The invention of portable field water quality monitor has become an important tool for staff to conduct long-term field scientific research and testing. Providing efficient, portable, portable and sufficient backup power solutions for the monitor is an important guarantee for researchers to carry out long-term field work. 18650 lithium battery pack has become the preferred solution for backup power supply of such high-tech test instruments because of its unique advantages.


1. Battery design requirements for field water quality monitor:


360直播吧Field water quality monitor is a portable water quality testing equipment, which can test the quality of water resources and check the pollution degree of water quality. The main components of the instrument are small electric pumps, mixers, heating devices, sensing parts, display parts and so on. The instantaneous start-up current of the equipment is high, the peak current can reach 20A, the normal working current is 4-5A, and the continuous working time of the battery is high. Therefore, Sanyo imported battery is adopted in our company. The battery has the advantages of high energy ratio, light weight, small volume, high cycle life, high safety and high voltage consistency. The lithium battery pack is designed to output over-current protection value of 30A and continuous working current. 7A, capacity 20Ah, fully meet the power demand of the instrument. Specific design parameters are as follows:


1) Design requirements of lithium battery pack model: 18650-3S8P/20Ah/11.1V.


360直播吧2) Circuit design requirements:


360直播吧a. Single overcharge protection voltage: 4.35+/-0.025V

b. Single overcharge recovery voltage: 4.15+/-0.050V

c. Single section overdischarge protection voltage: 2.40+/-0.08V

d. Single section over-discharge recovery voltage: 3.00 +/- 0.10V

e. Overcurrent Protection Value of Combination Batteries (10ms): 30-35A

f. Overtemperature protection value (recoverable): 70-plusmn; 5 degrees

g. The finished batteries also have short circuit and backcharge protection.


360直播吧3) Battery cycle life design requirements: 300-500 cycles (national standard charging and discharging standards)


4) Battery size design requirements:


2. Battery design scheme of field water quality monitor:


1) Protective board (PCM): The main protection circuit is designed for rechargeable lithium batteries. Because of the chemical characteristics of lithium batteries, it is necessary to provide intelligent power calculation, overcharge, overdischarge, short circuit, overcurrent and other protection functions. In order to avoid the danger of combustion, explosion and so on.


360直播吧2) Protection IC (Protection IC): The main protection function chip of the design scheme monitors the over-charge, over-discharge, over-current, short circuit and other functions online, so that the core can work in a safe, stable and efficient range.


3) Temperature switch: mainly for the design of temperature protection function. When the temperature of the battery itself reaches 70-plusmn due to other abnormal problems; when the temperature is in the range of 5 C, the temperature switch acts to protect the temperature.


4) 18650 lithium ion core/18650/2500mAh/3.7V Li-ion cell (SANYO).


360直播吧5) Field effect transistor (MOSFET): MOSFET plays a switching role in the protection circuit. It will never increase or decrease the voltage at both ends of the load and ensure voltage stability.


360直播吧6) The schematic diagram of battery design for field water quality monitor:

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