The global shipping industry's demand for green environmental protection and energy efficiency improvement is increasing day by day. Container ships, as an important means of transportation for international trade, are gradually transforming to electrification and intelligence. In this process, power battery system, as the core component of ship electrical propulsion, undertakes the important task of providing stable and efficient electric energy for the ship. This article will focus on the "BAU" power battery system, namely the standard power battery system configuration of "Business As Usual", and deeply analyze its design concept, technical characteristics and application value, to help readers fully understand the practical application and development prospect of traditional power battery system in the field of container ships.

I, BAU power battery system definition and background

"BAU" means "Business As Usual", which is literally translated As "Business As Usual" or "standard Business process". In the field of power battery system, it refers to traditional or standard power battery system configuration. For container ships, BAU power battery system represents a mature, reliable and verified battery design scheme, which is different from emerging high-performance, customized or innovative battery systems.

With the advancement of ship electrification trend, although a variety of new power battery technologies have appeared in the market, such as solid-state batteries and high-energy density lithium metal batteries, BAU system still occupies the mainstream position, because of its controllable cost, mature technology and easy maintenance, it is suitable for the stable operation of large-scale commercial ships.

1. battery Type
   BAU power battery system mostly adopts mature lithium ion battery technology, especially mainstream varieties such as lithium iron phosphate (LiFePO4) or ternary lithium battery (NCM/NCA). These batteries are famous for their high safety, long service life and stable cycle performance, and are suitable for the power demand of ships for a long time and large load.

2. Battery Module and battery pack design
   the standard BAU power battery system consists of multiple battery modules, each module contains several cell, and the modules form a complete battery pack through electrical connections. Modular design facilitates maintenance and replacement, and also facilitates system expansion and performance optimization.

3. Battery Management System (BMS)
   BMS is a key component of BAU system, which is responsible for monitoring the voltage, current, temperature and other parameters of battery pack in real time to ensure that the battery works within a safe range. BMS also has the functions of balanced charging, fault diagnosis and data recording to improve the safety and reliability of the system.

4. Heat dissipation and safety protection
   standard power battery systems are equipped with efficient heat dissipation solutions, such as liquid cooling or air cooling systems, to prevent battery overheating from causing performance degradation or safety accidents. At the same time, the system design includes multiple safety protection mechanisms, such as overcharge, overdischarge, short circuit and abnormal temperature protection, to ensure the safety of ship operation.

III. Application value of BAU power battery system in container ship

1. Reliability and stability
   as a "standard" power battery configuration, BAU system has been verified by a large number of offshore operations, and has high reliability and stability, which can meet the power demand of container ships during continuous navigation and ensure the normal operation of ship power system.

2. Cost-effectiveness advantage
   compared with emerging battery technologies, BAU power battery system has lower R & D and manufacturing costs, and has rich maintenance experience, thus reducing operating costs. This is of great significance for shipping enterprises to control the overall operating costs and maximize economic benefits.

3. Compatibility and scalability
   standardized design makes the BAU power battery system easy to integrate with the existing ship power and control system, supports segment expansion and upgrade, meets the requirements of different tonnage and voyage, and improves the flexibility and adaptability of the system.

4. Contribution to environmental protection and energy conservation
   by replacing traditional diesel engines or auxiliary power, the BAU power battery system effectively reduces the fuel consumption and exhaust emissions of ships, conforms to the increasingly strict environmental protection regulations of the International Maritime Organization (IMO), and promotes the green transformation of the shipping industry.