I. Project Background of Portable Ventilator Assistive Equipment
   With the rapid development of portable medical devices, when dealing with the uneven distribution of medical resources, large cities and central hospitals are concentrated, while remote areas and primary medical institutions lack equipment. Portable ventilator-assisted devices can provide convenient respiratory support for these areas, enabling more patients to receive timely treatment. The demand for emergency rescue is increasing, and natural disasters and public health events occur frequently. There is an urgent need for rapidly deployable and portable ventilator-assisted equipment to provide emergency respiratory support for patients in situations where professional medical conditions are limited.
   In special medical scenarios, patients with chronic respiratory diseases need long-term respiratory support in home medical care. Portable devices enable patients to receive treatment at home, improving their quality of life and reducing the pressure on hospitals. During the transfer process, small-sized, lightweight and easy-to-operate equipment is also needed to ensure the safety of patients' breathing. Technological development has driven progress in battery technology, sensor technology, micro-electromechanical systems, etc., providing technical support for the research and development and production of portable ventilator auxiliary equipment, improving its performance, making it smaller in size, lower in power consumption and higher in reliability, and meeting the usage requirements in different scenarios. With the expansion of market demand, the increase in health awareness, the intensification of population aging, and the rise in the number of patients with respiratory diseases, the market demand for portable ventilator-assisted devices has expanded. New energy lithium batteries, with their advantages of high energy density, long cycle life and environmental friendliness, have gradually become the preferred solution for the power system of medical equipment. This solution is aimed at the application requirements of lithium batteries in portable respiratory equipment projects, ensuring that lithium batteries can provide safe, efficient and customized power solutions in special fields.

II. Analysis of Equipment Demand Characteristics
1. Equipment application characteristics
▲ Equipment types: Emergency rescue, medical first aid, etc.
▲ Working environment: Temperature range, -20℃ to +70℃, high temperature, high humidity environment, high vibration, etc.
▲ Power demand: Large continuous/peak power, long battery life, and the voltage platform generally adopts 7.4V or 12V and other voltage platforms.

2. Core requirements for lithium batteries
▲ High safety: Meets the explosion-proof, shockproof and waterproof requirements of interference equipment under harsh working conditions.
▲ Long cycle life: ≥2000 times (80% capacity retention rate).
▲ Fast charging: Supports 2 to 3 hours of fast charging, suitable for high-intensity work.
▲ High-power discharge: The battery supports continuous high-current discharge, meeting the high-current requirements of high-power devices and ensuring their continuous and stable operation.
▲ Intelligent management: The BMS (Battery Management System) is equipped with functions such as overcharge protection, overdischarge protection, overcurrent protection, short-circuit protection, temperature protection, and fault diagnosis, making the battery more intelligent.
▲ Discharge temperature range: -20℃ to +70℃. In a low-temperature environment of -20℃, the battery's discharge efficiency is over 70%. A wider range of ambient temperature adaptability.
▲ Charging temperature: -20℃ to +50℃ range, with a wider adaptability to environmental temperatures.

III. Scheme Design
1. Battery selection
▲ Cell types: Ternary lithium batteries (ultra-low temperature, high energy density, high safety), lithium iron phosphate batteries (ultra-low temperature, high safety, long life), sodium-ion batteries (high safety, long life, good low-temperature performance). Different system cells are selected and matched according to different application scenarios.
▲ Battery combination configuration structure: Series and parallel schemes are designed based on the required voltage and capacity of the equipment to meet the requirements of different output voltage platforms.
▲ Structural design: IP65 to IP68 protection grade, shock-resistant structure, explosion-proof enclosure (suitable for extreme environments or flammable and explosive environments).

2. BMS Management System
Core functions:
▲ Real-time monitoring of the voltage, temperature, SOC (State of Charge), and SOH (State of Health) of individual battery cells.
▲ The battery charging active balancing technology enhances the consistency of usage among battery cells and extends the lifespan of the battery pack.
▲ The I2C/SMBUS/CAN/RS485 communication interface enables data interaction and communication with the main control system of the equipment.
▲ The Coulomb computing method makes the battery SOC more accurate and the battery smarter.

3. Charging solution
▲ Charging equipment: Customized smart charger/charger/charging cabinet, supporting constant current and constant voltage (CC-CV) charging.
▲ Charging strategy: Select fast charging or slow charging mode based on the working conditions to prevent battery overload.
▲ Intelligent control and management: Based on the technical performance characteristics of the battery, the battery charging process and fault diagnosis are intelligently controlled.

IV. Safety and Compliance
1. Safety protection
▲ Thermal management: By adopting a reasonable structural layout, thermal runaway is reduced. Air cooling can be used (for high-power scenarios) to ensure temperature uniformity during battery use and effectively control battery thermal runaway.
▲ Fault protection: Multiple hardware protection mechanisms such as overcharge, overdischarge, short circuit, overcurrent, and over-temperature.
▲ Fault protection: Multiple hardware protection mechanisms such as short circuit, overcurrent, and over-temperature.
▲ Explosion-proof certification: The design can pass various safety regulations certifications.

5. Standard compliance
▲ Comply with national standards: GB31241-2022 (Safety Technical Specification for Lithium-ion Batteries and Battery Packs for Portable Electronic Products), GB 17761-2024 (Safety Technical Specification for Electric Bicycles), GB/T 34131 (Lithium Batteries for Power Storage), GB 38031 (Safety Requirements for Batteries Used in Electric Vehicles), GB9706 series (Safety Standards for Medical Electrical Equipment), etc.
▲ How to obtain domestic and international certifications: GB certification, UN38.3 certification, UL certification, IEC certification, CE certification and other various certification requirements.

V. Project Implementation Plan

VI. Economic Benefit Analysis
1. Cost direction
▲ As a new type of energy product, lithium batteries are energy-saving and environmentally friendly, portable and lightweight, with low costs and easy maintenance. Compared with AC wired power supply, they are superior.
2. Energy-saving benefits:
▲ The charging efficiency is over 95%, significantly reducing energy consumption.
3. Maintenance cost:
▲ The maintenance-free design significantly reduces manual inspection and manufacturing costs.

VII. After-sales Service
1. Warranty period: 1 to 5 years of after-sales warranty, with a lifespan of 500 to 2,000 cycles or more (whichever comes first).
2. Remote monitoring: According to the actual demand status, the cloud platform provides real-time monitoring of the battery status and early warning of potential faults.
3. Emergency Response: Respond within 4 hours, provide solutions within 8 hours, and offer on-site technical support within 24 to 48 hours.

Hint:
▲ The plan needs to be refined based on specific equipment parameters (such as voltage, capacity, and size limitations).
▲ It is recommended to conduct joint debugging with the equipment manufacturer to ensure the compatibility of the battery with the entire machine system.