With the continuous progress of science and technology, submarine, as an important underwater combat platform, has greatly improved its potential and combat effectiveness. Among them, the introduction of Air Independent Propulsion (AIP for short) system enables submarine to have longer submarine capability and lower noise level in underwater operations. This article will focus on the technical principle and advantages of using lithium ion batteries to develop AIP system in submarine.

1. Technical principles

AIP system refers to the use of non-nuclear power fuel cells, lithium ion battery and other submarine propulsion systems as power sources. In AIP system, lithium ion battery, as the main energy storage device, provides power support for submarine through charging and discharging processes. By inputting hydrogen and oxygen into the fuel cell, electric energy is generated and electric energy is driven by the motor, thus pushing the submarine forward.

2. Technical advantages

• long-time submarine capability: the introduction of AIP system enables submarine to break away from the dependence on external air in underwater operations, greatly prolonging the submarine time and improving the operational efficiency.
• Low noise level: Compared with traditional nuclear-powered submarine, AIP system submarine has lower noise level and more concealment, which is conducive to the implementation of hidden underwater combat operations.
• <strong> environmental protection and energy saving: AIP system uses clean energy sources such as fuel cells and lithium ion batteries as power sources, which reduces environmental pollution and is more environmentally friendly.
• Fast charging: lithium-ion battery has the feature of fast charging, which can complete charging in a short time and improve the use efficiency of submarine.

3. Technology Application

• underwater combat: the application of AIP system enables submarine to have longer submarine capability and lower noise level in underwater operations, which is conducive to the implementation of underwater reconnaissance, strike and other tasks.
• Marine science examination: AIP system submarine can stay at the bottom of the sea for a long time during the Marine scientific examination, and conduct marine resource investigation, environmental monitoring and other work.
• Submarine research and development: the introduction of AIP system promotes the development of submarine technology and provides new ideas and technical support for the design and construction of submarine in the future.

4. Technical challenges

• energy density: the energy density of lithium-ion batteries limits the submarine's diving time. How to improve the energy density of batteries is the focus of future development.
• Security: the safety of lithium-ion batteries used in the deep seabed should be considered to prevent overheating, leakage and other safety problems.
• cost: compared with the traditional power system, lithium-ion batteries have higher costs. How to reduce costs is one of the challenges in the development of technology.

Using lithium-ion batteries to develop AIP system in submarine is an important development direction in the field of submarine technology, which has significant advantages in improving submarine's submarine capability, reducing noise level, protecting the environment, etc. Although there are still some challenges and problems in the application of technology, with the continuous progress and improvement of technology, it is believed that AIP system will play an increasingly important role in the construction and application of submarine in the future.