Recently, CATL lithium iron phosphate energy storage products -- air-cooled products (1P20S series) and water-cooled products (1P52S series), successfully passed the cell, module and cabinet level UL9540A test. The UL9540A is currently recognized overseas as a challenging international safety test. At this point, CATL has become the first domestic lithium enterprise to pass the test, which will also lay a good foundation for the global development of our energy storage business.

Based on international high standards, strict safety

Energy storage system safety is a common concern in the industry, and relevant laws and regulations are gradually improving. The UL9540A test, developed by UL, is a widely accepted test method for assessing the spread of large-scale thermal runaway fire in battery energy storage systems. The authoritative industry codes in the United States, such as the United States Electrical Code (Section 706), the United States Residential Code (Section R327), the United States International Fire Code (Section Energy Storage) and the United States National Fire Service NFPA855 standard, all put forward the UL 9540A listing requirements for energy storage systems.

CATL is committed to providing customers with safe, efficient and economical energy storage solutions, and always adheres to high standards to test energy storage products. At present, 271Ah&280Ah cell, 1P20S electric box and 1P20S*17 electric cabinet, 280Ah1P52S electric box and 1P52S*8 electric cabinet have completed UL 9540A test, the test results prove that the fixed energy storage products of NDE Times have high safety grade.

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Test Condition

Taking the electrical cabinet level test as an example, CATL air-cooled and water-cooled products performed well: under the condition of no fire protection system, the electrical cabinet only emitted smoke during the test, and there was no flame, splash or gas explosion; There is no heat diffusion between the cells, other electric boxes are not affected, and there is no damage to the trigger electric cabinet, the target electric cabinet and the wall; The maximum surface temperature, wall temperature and relative temperature rise of the target cabinet meet the requirements of NFPA 220 and NFPA 855.

From materials to products, ensure the safety of energy storage system throughout its life cycle

As energy infrastructure, energy storage security is related to power grid security and electricity safety. Ningde Times adopts a scientific product development process to ensure the safety of the whole life cycle of the energy storage system through the whole process of battery research and development, manufacturing and use.

In the selection of cathode materials for energy storage batteries, CATL always adheres to the safe and reliable lithium iron phosphate battery route. Lithium iron phosphate has strong thermal stability, is not easy to fail in the process of temperature rise, reaction, heat release and gas production are relatively weak; Even in the event of failure, lithium iron phosphate does not release oxygen, preventing fire and explosion. On the basis of safe materials, based on the "high-throughput screening technology", we innovate the formula and process of lithium iron phosphate cathode materials, additives and system materials, so that the battery materials with excellent performance and industrialization stand out, and continue to improve the performance of lithium iron phosphate batteries.

In addition to micro materials, product and process design is also strictly safety. CATL's square aluminum shell energy storage cells have high structural strength, good air tightness, and a reliable life of more than 20 years; Its unique explosion-proof valve design can timely, directional pressure relief, balance the pressure inside and outside the cell. In addition, the system structure and electrical safety design (multistage break and quick plug) help prevent ignition sources.

CATL water-cooled electric cabinet series certification

In addition to UL 9540A, CATL has also passed a series of authoritative certifications at home and abroad, such as GB/T 36276, IEC 62619, 62477-1 LVD, 61000-6-2/-4 EMC and UL 1973. We actively participate in high standard and authoritative tests at home and abroad to verify the safety of energy storage products, ensure the smooth landing and safe operation of energy storage projects, and promote the healthy development of energy storage industry.

With safe and innovative energy storage solutions, CATL hopes to improve the stability and reliability of renewable power generation, expand the proportion of renewable energy utilization, optimize the energy mix, and contribute to the global energy revolution. At the same time, we also hope to use the energy storage system to provide safe and reliable power guarantee for "new infrastructure" sectors such as 5G networks, UHV, intercity high-speed railways and urban rail transit, charging piles for new energy vehicles, and data centers, so as to get through energy big data, leverage industrial synergies, and boost economic transformation and upgrading.

Photo source: Time Kstar official website

近日，宁德时代磷酸铁锂储能产品——风冷产品（1P20S系列）和水冷产品（1P52S系列），顺利通过电芯、模组及电柜级的UL9540A测试。UL9540A是目前海外公认具有挑战性的国际安全测试。至此，宁德时代成为国内首家通过该项测试的锂电企业，这也将为我司储能业务的全球发展奠定良好基础。

立足国际高标准，严格把好安全关

储能系统安全是行业内普遍关注的问题，相关法律法规也在逐渐完善。UL9540A测试由UL公司提出，是用以评估电池储能系统大规模热失控火蔓延情况的测试方法，受到相关部门的广泛认可。美国权威的行业规范，如《美国电工法》（706章节）、《美国住宅规范》（R327章节）、《美国国际防火规范》（储能章节）和美国国家消防局的NFPA855标准等都对储能系统提出了UL 9540A列名的要求。

宁德时代致力于为客户提供安全、高效和经济的储能解决方案，始终坚持以高标准来检验储能产品。目前，271Ah&280Ah电芯、1P20S电箱和1P20S*17电柜，280Ah1P52S电箱和1P52S*8电柜均已完成UL 9540A测试，测试结果证明宁德时代固定式储能产品具有高安全等级。

测试条件

以电柜层级测试为例，宁德时代风冷和水冷产品均表现良好：在无消防系统的条件下，测试过程中电柜只会冒烟，并无火焰、飞溅物或气体爆炸；电芯间也无热扩散，其他电箱未受影响，触发电柜、目标电柜与墙面均无损害；目标电柜表面最高温、墙面温度及相对温升符合NFPA 220与NFPA 855要求。

从材料到产品 确保储能系统全生命周期安全

作为能源基础设施，储能安全关系到电网安全和用电安全。宁德时代采用科学的产品开发流程，将安全贯穿到电池研发、制造和使用全过程，保障储能系统全生命周期的安全性。

在储能电池正极材料的选择上，宁德时代始终坚持安全、可靠的磷酸铁锂电池路线。磷酸铁锂热稳定性强，在温升过程中不易失效，反应、放热和产气相对较弱；即使在失效情况下，磷酸铁锂也不会释氧，避免着火和爆炸。在安全用料基础上，我们基于“高通量筛选技术”，创新磷酸铁锂正极材料、添加剂、系统材料配方与工艺，让性能优异、可产业化的电池材料脱颖而出，持续改善磷酸铁锂电池的性能。

除了微观材料，产品和工艺设计也严把安全关。宁德时代的方形铝壳储能电芯结构强度高，气密性好，可靠寿命超过20年；其独特的防爆阀设计能够及时、定向泄压，平衡电芯内外气压。此外，系统结构和电气安全设计（多级分断和快插）都有助于防止点火源的产生。

宁德时代水冷电柜系列认证

除了UL 9540A，宁德时代还通过了GB/T 36276，IEC 62619，62477-1 LVD，61000-6-2/-4 EMC和UL 1973等一系列国内外权威认证。我们积极参与国内外高标准权威测试，在验证储能产品安全的同时，保障储能项目顺利落地与安全运行，促进储能行业健康发展。

宁德时代希望凭借安全、创新的储能解决方案，提高可再生能源发电的稳定性和可靠性，扩大可再生能源利用比例，优化能源结构，助力全球能源革命。同时，我们还希望通过储能系统为5G网络、特高压、城际高速铁路和城市轨道交通、新能源汽车充电桩、数据中心等“新基建”板块提供安全可靠的电能保障，打通能源大数据，发挥产业协同优势，助推经济转型升级。