Citation: (Key words: Lithium battery for medical ventilator) With the continuous improvement of people's living standards, medical services and medical products are constantly improving, and traditional fixed medical equipment has been replaced by new medical products with strong flexibility, high precision and intelligence. The new intelligent infusion pump replaces the traditional infusion method, can choose infusion speed and method intelligently and reasonably according to the needs of different patients, and flexibly move, convenient for different people in different places and different environments in the application and operation. The spare lithium battery of our medical infusion pump provides continuous and stable power supply for the fixed and mobile use of infusion pump, and it is in a safe, efficient, continuous and stable working state all the time!



Design scheme



I. Design requirements of lithium battery for medical ventilator:



Medical ventilator is a new intelligent medical product for medical infusion. Due to the particularity of its application group and environment, it has very special requirements for batteries. For example, the input and output of batteries must be the same port, so as to facilitate the safe operation of relevant personnel. The battery must have charge and discharge quantity indication, the quantity indication must be steady on, so that the patient and relevant personnel always observe; Battery safety and fire rating must meet the special requirements of medical products.



1) Lithium battery pack model design requirements: 18650-2S1P/ 3.5AH /7.2V.



2) Input and output characteristics: output and output adopt the same port, and automatic switching function is adopted according to the special requirements of medical treatment.



Items (item)



The minimum (Min.)



Type Value



Max (Max.)



Units (Unit)



Input voltage







8.4







V



Input Current



1



2



3



A



Output voltage



6.0



7.2



8.4



V



Output Current



0



3.5



10



A



3) Basic characteristics of the protection plate



1, single overcharge protection voltage: 4.25±0.025V



2, single overcharge recovery voltage: 4.10±0.10V



3, single over-discharge protection voltage: 3.00±0.08V



4, single over-discharge recovery voltage: 3.00±0.10V



5, combined battery overcurrent protection value (10ms) : 5~12A



6, the combined battery overtemperature protection value (recoverable) : 70±5℃



7, the finished battery with short circuit, reverse charge protection.



6) Battery cycle life design requirements: 300~500 times (national standard charge and discharge standard)



7) Battery appearance and size design requirements:







Ii. Lithium battery design scheme for medical ventilator:



1) Protection plate (PCM) : it is mainly a protection line designed for rechargeable lithium battery pack. Due to the chemical characteristics of lithium battery itself, it is necessary to provide intelligent power calculation, over charge, over discharge, short circuit, over current and other protection functions to avoid combustion, explosion and other dangers.



2) Protection IC: the main Protection function chip of the design scheme can carry out online monitoring of overcharge, overdischarge, overcurrent, short circuit and other functions of the cell, so that the cell can work in a safe, stable and efficient range.