In 2007, the “New Energy Vehicle Production Access Management Rules” was promulgated to give China’s new energy vehicles industrialization policy guidance. In 2012, the “Energy-saving and New Energy Automobile Industry Development Plan (2012-2020)” was put forward and became the beginning of China’s new energy automobile development. In 2015, the “Notice on Financial Support Policies for the Promotion and Application of New Energy Vehicles in 2016-2020″ was released, which opened the prelude to the explosive development of China’s new energy vehicles.
The release of the “Guiding Opinions on Promoting the Development of Energy Storage Technology and Industry” in 2017 marked the explosion of the energy storage industry and made 2018 the beginning of the rapid development of China’s energy storage industry. As shown in Figure 1, according to the statistics of the China Association of Automobile Manufacturers, the production and sales of China’s new energy vehicles have shown explosive growth from 2012 to 2018; according to the “Energy Storage Industry Research White Paper 2019″ issued by the Zhongguancun Energy Storage Industry Technology Alliance It shows that the installed capacity of China’s electro chemical energy storage has increased exponentially. As of 2017, the cumulative installed capacity of lithium-ion battery energy storage in China accounted for 58% of the cumulative installed capacity of electro chemical energy storage.
Lithium-ion batteries have obvious advantages in the field of electrochemical energy storage in China, and to run electrochemical energy storage power stations better and more stably, it is necessary to analyze the disciplines and related products involved from the technical side. As shown in Figure 2, it is the technical system of electrochemical energy storage products. Electrochemical-related technical products (cell products, module products, energy storage systems) represented by lithium-ion batteries are the heart of electrochemical energy storage. The role of other related products is to ensure that electrochemical energy storage products work better and more stable
For lithium-ion battery cell products, the main technical elements that affect the application of electrochemical energy storage are life, safety, energy, and power, as shown in Figure 3. The impact of cycle life is related to factors such as working environment, operating conditions, material formulation, estimation accuracy, etc.; and safety evaluation indicators mainly include electrical-power-thermal safety and other environmental safety requirements, such as internal and external short circuit, Vibration, acupuncture, shock, overcharge, overdischarge, over temperature, high humidity, low air pressure, etc. The influencing factors of energy density are mainly affected by the material system and manufacturing process. The influencing factors of power characteristics are mainly related to the stability of the material structure, ionic conductivity and electronic conductivity, and working temperature. Therefore, from the design perspective of lithium-ion battery cell products, more attention needs to be paid to the selection of materials, the design of electrochemical systems (positive and negative materials, N/P ratio, compaction density, etc.), and manufacturing processes (temperature Humidity control, coating process, liquid injection process, chemical conversion process, etc.).
For lithium-ion battery module products, the main technical elements that affect the application of electrochemical energy storage are the consistency, safety, power, and energy of the battery, as shown in Figure 4. Among them, the consistency of the battery cell of the module product is mainly related to the control of the manufacturing process, the technical requirements of the battery cell assembly, and the estimation accuracy. The safety of module products is consistent with the safety requirements of battery cell products, but design factors such as heat accumulation and heat dissipation need to be considered. The energy density of module products is mainly to increase its energy density from the perspective of lightweight design, while its power characteristics are mainly considered from the perspectives of thermal management, cell characteristics, and series-parallel design. Therefore, from the perspective of the design of lithium-ion battery module products, more attention needs to be paid to the requirements of the configuration, lightweight design, series-parallel design, and thermal management.
Post time: Dec-27-2021