As one of the most widely used rechargeable batteries, lithium ion batteries play an important role in the fields of consumer electronics, electric vehicles, energy storage systems and so on due to their high energy density, long service life and environmental protection performance. With the continuous expansion of market scale, the safety, performance stability and environmental friendliness of lithium ion batteries have attracted more and more attention. In order to ensure the healthy and orderly development of the industry, a series of standard conditions have been formed in the industry, covering design and manufacturing, safety inspection, quality control, environmental protection and other aspects. This article will elaborate on the standard conditions of lithium ion battery industry, helping relevant practitioners and regulatory agencies to deeply understand and strictly implement these standards.

I. Raw materials and design standards

the safety performance and life of lithium ion batteries depend to a large extent on the selection of raw materials and the rationality of battery design.

1. Quality control of raw materials

the cathode materials (such as ternary materials, lithium iron phosphate, etc.), anode materials (such as graphite), electrolyte and separator of lithium ion batteries must meet industry standards to ensure purity and stable performance. Raw materials shall not contain harmful impurities exceeding the standard, otherwise the cycle life and safety of the battery will be affected.

In addition, the electrolyte is usually a mixture of organic solvent and lithium salt, which requires strict control of moisture content and impurities to avoid side reactions during charging and discharging of the battery.

2. Battery structure design specifications

the design of the battery should ensure that the internal structure is stable and the electrode materials are evenly distributed to avoid the risk of local hot spots and short circuits. The diaphragm must have good thermal stability and mechanical strength to prevent puncture and direct contact with the electrode.

Reasonable battery packaging technology is also an important part of the design specification, which requires good sealing performance to prevent electrolyte leakage and gas liberation.

II. Safety Performance specifications

the safety of lithium ion batteries is the core content of industry specifications, which is mainly reflected in preventing short circuit, overcharge, overdischarge, thermal runaway, etc.

1. Overcharge and overdischarge protection

the battery must be equipped with perfect protection circuit to prevent the voltage from exceeding the designed upper limit or below the safety lower limit. Overcharging will cause the generation and expansion of gas inside the battery, while overdischarging may cause the damage of the battery pole piece, both of which may lead to safety accidents.

2. Temperature control and thermal management

industry specifications require batteries to have good thermal management design to ensure that the temperature is kept within a safe range during work. Excessive temperature is easy to cause thermal runaway, leading to combustion or explosion.

The battery should pass thermal stability tests, such as thermal shock and thermal abuse tests, to verify its safety performance in abnormal environment.

3. Internal short circuit protection

in the design process, multiple measures should be taken to prevent internal short circuit, including adopting high-quality diaphragm, strict manufacturing process control and detection means.

In addition, the battery should pass mechanical abuse tests such as acupuncture and extrusion to ensure that no danger occurs when it is damaged by external forces.

III. Production process and quality management specifications

the production process of lithium ion batteries is complex, involving material processing, electrode manufacturing, battery assembly and other links. Standardized production process is the key to ensure product quality and safety.

1. Production environment requirements

2. Process control standards

detailed process parameters should be formulated in each production link to ensure the key indexes such as uniform coating thickness, tight winding of pole pieces, accurate injection volume, etc. After the battery is assembled, strict electrical performance tests should be carried out, including capacity, internal resistance, cycle life, etc.

3. Quality inspection system

lithium Ion battery manufacturers need to establish a perfect quality management system to inspect raw materials, semi-finished products and finished products respectively. Common detection methods include X-ray inspection, scanning electron microscope inspection, air tightness test, pressure test, etc.

In addition, the battery must pass the safety certification stipulated by the industry, such as UN38.3 transportation test and UL safety certification, to ensure that the product meets the market access conditions at home and abroad.

IV. Environmental Protection and recycling specifications

lithium ion batteries involve a variety of chemicals and metal elements in the production and use process, and standardized environmental protection measures are the content that the industry must abide.

1. Green manufacturing requirements

in the production process, the emission of harmful substances should be reduced as much as possible, and environmental protection technology and materials should be adopted. Waste gas and waste water treatment must meet environmental protection standards to prevent pollution to the environment.

2. Battery recycling and reuse

waste lithium ion batteries are hazardous wastes, and a perfect recycling system must be established. The specifications require that waste battery recycling channels be smooth, and the recycling process conforms to safety specifications to prevent secondary pollution and safety accidents.

After recycling, the batteries should be classified, and valuable materials should be disassembled for recycling to reduce resource waste.

V. Testing and Certification Specifications

the testing and certification of lithium ion batteries is an important means of standard implementation to ensure the safety and reliability of products on the market.

1. Performance testing

<span style = "font-size: 14px;"> the battery needs to be tested by capacity, internal resistance, cycle life, charge and discharge efficiency and other performance indicators to ensure that it meets the design requirements.

2. Security testing

including short circuit test, overcharge test, thermal abuse test, mechanical impact test, etc., to simulate the performance of the battery under extreme conditions and assess the safety risks.

3. Certification standards

lithium ion battery it shall comply with national standards and industry standards, such as GB/T 31444-2015 safety requirements for lithium ion batteries, UL 1642, IEC 62133, etc., and meet the regulatory requirements of exporting countries.

VI. Personnel and management specifications

in addition to technical standards, the lithium ion battery industry also puts forward normative requirements for personnel quality and management system.

1. Professional training

employees should receive professional training, master the safety knowledge and operation skills of battery manufacturing, and prevent potential safety hazards in the production process.

2. Safety management system

enterprises should establish and improve safety management systems, conduct regular safety inspections and risk assessments, implement emergency plans, and ensure production safety.

3. Information recording and tracing

the specification requires detailed records of production batches, battery performance and abnormal conditions to achieve traceability of product quality and facilitate tracing of problems and recall.

The standard conditions of lithium ion battery industry Cover raw materials, design, safety performance, production process, environmental protection, testing and certification, personnel management and other aspects, A systematic quality and safety assurance system has been formed. Strict compliance with these specifications can not only improve the product quality and safety performance of lithium ion batteries, but also help promote the healthy development of the entire industry.