With the continuous improvement of electrification and intelligence level of modern ships, as an important component of ship energy system, the safety and reliability of marine batteries have attracted much attention. To ensure that the performance of marine batteries meets the stringent requirements for offshore use, Classification Society (Classification Society) implements strict certification management for battery products. Classification Society has a wide variety of certified battery files, which are not only distinguished according to different types of batteries, but also different according to the specific use and installation position of batteries in ships. This article will introduce the types and classification standards of battery files certified by classification society in detail to help relevant practitioners deeply understand and correctly use relevant certification files.

I. Basic classification of certified batteries of classification society

the certification documents of classification society are firstly divided according to the types of batteries. Marine batteries mainly include lead-acid batteries, lithium-ion batteries, nickel-cadmium batteries, etc. Different types of batteries have different certification requirements due to their different chemical properties, working principles and safety risks.

1. Lead-acid battery certification documents

lead-acid battery is a traditional marine battery, which is widely used, especially in ship emergency supply and starting power supply. Classification Society's certification documents for lead-acid batteries mainly focus on their electrical performance, safety performance and durability test reports. The certification contents include capacity test, cycle life, overcharge and overdischarge protection, etc, at the same time, it also focuses on examining the explosion-proof and anti-corrosion performance of the battery.

2. Lithium ion battery certification documents

Lithium-ion batteries have gradually become a new choice for marine batteries due to their high energy density and long service life. Classification Society has stricter requirements on the certification documents of lithium ion batteries, covering the safety test reports of batteries (including short circuit, overcharge, thermal abuse, mechanical damage, etc.), and the performance verification of the battery management system (BMS). Due to its potential risk of thermal runaway, relevant safety assessment and risk analysis documents are also important components of certification.

3. Nickel-cadmium battery certification documents

nickel-cadmium batteries are still used in some ship emergency systems due to their stable performance and durability. Classification Society's certification documents for nickel-cadmium batteries focus on battery performance test, environmental adaptability test and safety performance report.

II. Classification of certification documents based on battery usage and installation location

in addition to classification by battery type, classification society will also formulate different certification document requirements according to the specific use and installation location of the battery. This is because different regions of the ship have different requirements on the environmental conditions and safety risks of the battery, and the certification documents must reflect these differences.

1. Main power system use a battery files

the battery used in the ship's main power system usually undertakes the function of auxiliary starting or power energy storage.The certification document of this type of battery focuses on its high performance index and high reliability, including high rate discharge capability, fast charging performance and long service life test. The document also includes safety assessment for extreme working conditions, such as environmental adaptability test reports for high temperature, vibration, impact, etc.

2. Emergency backup power supply battery file

ship emergency backup power battery is used for emergency power supply of key systems such as navigation, communication and fire fighting equipment. The certification documents of this kind of battery emphasize its reliability and safety, and require detailed safety test data, including performance under extreme temperature, overcharge and overdischarge protection, short circuit protection and fire protection level certification. In addition, it is also necessary to provide test reports on the performance retention rate and quick start capability of the battery in the state of standing for a long time.

3. Ship living area battery file

the battery in the living area of the ship mainly provides power support for the life facilities of the crew. Due to the dense personnel, the safety standards are particularly strict. In addition to conventional performance tests, the certification documents focus more on the test results of explosion-proof, fire-proof and hazardous substance emission. Relevant documents shall include environmental adaptability tests, such as verification reports of salt spray resistance, wet heat resistance and corrosion resistance.

4. Ship energy storage system battery file

with the improvement of energy efficiency and environmental protection requirements of ships, the application of energy storage system batteries is gradually increasing. This kind of battery certification document combines the test reports of safety performance, electrical performance and system integration performance. The document shall cover the compatibility between the battery and the ship's electrical system.Testing, functional verification of the battery management system, and system-level security assessment.

III. Main contents of battery files certified by classification society

no matter what kind of battery type or use it is, the certified battery file of classification society generally includes the following core contents:

1. Technical specifications

the electrical parameters (capacity, voltage, internal resistance, etc.), physical size, weight, and applicable environmental conditions of the battery are described in detail.

2. Test report

including detailed data and conclusions of performance test, safety test and environmental adaptability test to ensure that the battery meets relevant standards and marine requirements.

3. Safety Assessment Report

for battery analysis of potential risks, including thermal runaway risk, chemical leakage risk and mechanical damageRisk of injury, etc., and put forward corresponding risk control measures.

4. Quality Management System documents

it proves that battery manufacturers have stable production and quality control capabilities to ensure product consistency and reliability.

5. Installation and Maintenance Manual

provide the correct installation, use and maintenance methods of the battery in the ship to ensure the safety and performance of the battery throughout the service cycle.

Classification Society has a wide variety of certified battery files, covering the differences in battery types and diversified application requirements. Through strict classification and targeted testing, classification society ensures that all kinds of marine batteries can meet the requirements of safe and reliable standards in different working environments.