602030 lipo battery

A brief discussion on the safety issues and improvement technologies of 602030 lipo battery

According to statistics from the my country Chemical and Physical Power Industry Association, the total output of various types of lithium-ion batteries in my country in 2016 was 87.3GWh, up 42% year-on-year. Among them, the output of power lithium-ion batteries reached 33GWh. The Power Lithium Battery Application Branch of the my country Chemical and Physical Power Industry Association predicts that the market size of new energy vehicles will reach 2 million in 2020, and the demand for power lithium batteries will be about 130GWh. The power lithium battery industry is developing rapidly and urgently needs national standards to regulate it to prevent disorderly vicious competition. The standardization of power lithium batteries was one of its important topics at the Lithium Industry International Summit Forum held in Qinghai not long ago. In order for power lithium batteries to achieve a safe rise, the standard issue must be solved first.

Standards are the common language of business

Regarding standards, different organizations and documents give different meanings, but their importance is unanimously recognized. Liu Fei, chief representative of the ASTM International Office in my country, believes that standards are the common language of business, and no transactions can be made without standards.

In recent years, my country has initially built a support system for the industrial development, industry management, recycling, and standards and specifications of power lithium batteries. But objectively speaking, this system needs to be improved, and many issues need further study. Wang Zidong, director of the Power Lithium Battery Laboratory of the Northern Vehicle Research Institute of my country, said that in order to extend the life of power lithium batteries and achieve cascade utilization, standardized production must be implemented. Wang Zidong has repeatedly emphasized the significance of standardization in the power lithium battery industry and believes that domestic companies do not pay enough attention to it.

In the view of Pi Yahui, project manager of TÜV Rheinland, Germany, safety standards are of great importance to lithium-ion batteries. He believes that safety management is a basic management measure for all lithium-ion energy storage systems, and all lithium-ion batteries should be equipped with independent electronic protection measures and electroplating protection measures that can resist vibration.

Standard system for the export of power lithium batteries

At present, the more common standard systems in the world include ISO (International Organization for Standardization), IEC (International Electrotechnical Commission), UNECE (United Nations Economic Commission), ASTM (American Society for Testing and Materials), UL (Underwriters Laboratories), etc.

According to Battery my country Network, these standards are roughly divided into four steps in the formulation of safety management standards for power lithium-ion batteries, namely: first, identify what dangers lithium-ion batteries may have and their root causes, second, identify failure modes, third, carry out risk control, and fourth, set up protective measures for the source of danger to prevent the escalation of danger.

In terms of test types, these global standards for power lithium-ion battery tests can be divided into two categories: one is to test the limits of battery stability and analyze the nature and intensity of pressure that may cause potential harm to lithium-ion batteries. The second is to conduct vibration tests to ensure the safety of power lithium batteries when vehicles are driving on actual roads.

These international test standards mainly involve external short circuits, abnormal charging, strong charging, extrusion, impact, collision, vibration, heating, low thermal shock, continuous low-speed charging, fire, etc.

The formulation of power lithium battery standards must have a global perspective

In my country's power lithium battery system, standards such as power cells, power lithium battery modules, and safety protection requirements are mostly formulated by companies or company alliances with strong technical strength, and are generally guided by the smooth implementation of power lithium battery product technology. From the perspective of the global market, the advanced foreign standard systems, including those in Japan and South Korea, are universal standards rather than a specific roadmap. This also gives us inspiration that basic requirements such as battery safety must be coordinated and consistent, which is the basic demand for writing standards.

Compared with foreign countries, my country's power lithium battery standard system still needs to be improved. Liu Fei believes that my country's power lithium battery standards are mostly product-oriented, limited to the domestic market, and lack a global perspective. He said that although Japan and South Korea's power lithium battery technology is more advanced than ours, their markets can still be included in our standard system.

In addition, a good standard should also emphasize product quality, target relevance and effectiveness of use. It should first be guided by the user's standards and then consider the market orientation. More importantly, the personnel composition of the standard-setting committee should be as diverse as possible, and relevant personnel from the government, companies, experts and even competitor companies should be included to jointly formulate power lithium battery standards, because the core competitiveness of a good standard lies in the people who formulate the standards, the team behind them and the operating mechanism.

GB standards for power lithium batteries will be enforced

my country's existing power lithium battery standard system is mainly divided into several aspects, such as electrical performance, life, safety, interchangeability, recycling and key accessories. In order to improve the product standard system, more standards are being submitted for approval or formulated.

According to the Battery my country Network, at present, two standards for power lithium battery specifications and dimensions and coding system are being submitted for approval, and the management system of power lithium batteries and standards for disassembly, packaging and transportation, cascade utilization and material recycling are also being formulated. It is worth noting that the Standards Committee is formulating the GB standard for power lithium batteries, and has established a special group for vibration and thermal diffusion research, and called on many domestic car companies to participate. It is understood that after the standard is issued, the state will enforce it.

With the development of my country's new energy vehicle industry, opening up the international market will be an important direction in the future. The power lithium battery standard system will inevitably include the global market in its vision, and the formulation of standards has become particularly important. Wang Fang, chief expert of the my country Automotive Technology Research Center, told the Battery my country Network that he hopes that the company can start from the source of the material, comprehensively consider the analysis of the material safety mechanism, the research on battery safety behavior, the management and control of battery modules and system safety, and form a closed-loop safety design concept, and do a good job of the entire system from the perspective of test analysis.

Wang Fang has two special reminders for power lithium battery companies, namely: First, battery safety is relative. When designing a battery system, you must understand what kind of safety range your battery is in and strengthen protection for weak points during design. Second, you must pay attention to the mechanism and method of heat generation in the battery itself, and use the system integration concept to make the battery cell safer.

As my country's new energy vehicles enter the development stage from the introduction stage, the power lithium battery industry has also ushered in a faster rise. However, with the development of overseas markets by Chinese companies and the arrival of the retirement tide of power lithium batteries, the further development of power lithium batteries will be constrained by the increasingly prominent standard issues. In order for power lithium batteries to achieve a safe rise, it is necessary to first solve the standard issue and build a complete, effective and more reasonable power lithium battery standard system to allow products to flow freely in the network constructed by standards.

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