Blade batteryIt is a new type of lithium battery design. This design arranges the single battery in a long strip shell to improve the structural strength and safety of the battery packBlade batteryIt adopts a more compact design, so it can accommodate more battery cells in the same volume, thus improving the energy density of the battery pack, which is suitable forEnergy storage fieldRequirements for energy density.At the same time, a more uniform heat dissipation design is adopted, which effectively reduces the temperature of the battery pack and extends the service life of the battery. The production cost is relatively low, which can reduce the construction cost of the energy storage system.
From 14:00 to 17:00 on January 25, 2024, the 2024 New Battery Technology Seminar held by Charger Network and Battery Trading Network was successfully held on the official account platform of Charger Network. This live seminar, Charger Network invited several well-known enterprises to give wonderful speeches. The speakers shared new battery products and technologies, and shared the latest market trends and dry goods.
At this conference, Hunan Cubic New Energy has broughtBlade batterystayEnergy storage fieldApplication andPolyanion sodiumIn the process of industrialization, the guest speaker was Meng Chenbao, vice general manager of Hunan Cubic New Energy Quality Center and Nafang Sales Center.
Meng Chenbao, a graduate of Central South University and a 6Sigma black belt, is now the Deputy General Manager of the Quality Center and Nafang Sales Center of Hunan Cubic New Energy Technology Co., Ltd. and the Deputy Secretary General of Guangdong Battery Industry Association.Master the comprehensive product knowledge of power supply, lithium sodium battery and communication;He has 16 years of quality and safety management experience in power supply and communication industries and 10 years of experience in lithium new energy industry.
At present, the challenges facing the energy storage system are economy and security.
The economic problems are strongly related to the energy storage life. The after-sales service cycle of the energy storage system is long and the life is short. Especially, the life of photovoltaic products is generally 25 years, but the energy storage system may need to be replaced several times during this period.
At the same time, the safety problem is also particularly important. No matter in use or production, there will be hidden dangers of fire.
At the same time, temperature also has a greater impact on the life of the electric core. In different environments of actual energy storage applications, the actual cycle life of the energy storage system is less than half of the economic cycle life.
In practical application, the temperature distribution of the electric core system is different, which affects the safety and life.
The blade core has the advantages of being wider and thinner, which can make the heat dissipation power greater, easier to pass the puncture experiment, and has better safety performance. As can be seen from the cubic algorithm, the heat dissipation power of the cubic blade core is 2.23 times higher than that of other 280 cores.
cubeBlade batteryAt the same time, the outlet lugs on both sides are equipped with multiple explosion-proof valves on the top cover of the positive and negative poles to shorten the length and width of the air release path. At the same time, it has passed the extreme safety certification such as overcharge and UL9540A loss of heat control.
During the charging and discharging process of the core, the heating temperature rise at the pole ear position is the largest, the positive and negative pole ears of the 280 core are on the same side, and the maximum heat source is concentrated on the top of the core, resulting in a large temperature difference between the top and bottom of the coreBlade batteryIt is designed for double end outlet lug, the largest heating source does not overlap, the temperature rise of the electric core is smaller, and the temperature is more uniform.
The current heat dissipation mode of 280 core is bottom heat dissipation, which leads to a large temperature difference of the core and shortens the cycle life. There are heat dissipation devices at the top and bottom of the blade core when it is vertically discharged, which makes the temperature of the core even, and increases the heat dissipation power consumption by about 67% compared with the bottom heat dissipation.
The winding process is used for the traditional 280 electric core, which leads to the inconsistency of the internal and external stress of the "C angle" pole piece, which is risky. However, the stacking process is used for the blade electric core, which does not lead to the "C angle", so that the stability is better and the cycle performance is also better.
In addition to the stacking process, various materials have also been optimized, and lithium replenishment process has also been carried out to ensure the measures of 10000 secondary cycles.
280 cell and blade cell.
The blade battery is used to build the module, which makes the X, Y and Z axes have 1mm more space, and the space utilization rate is higher. At the same time, the bulk energy density of the pack is improved.
Blade battery is easier to realize CTS structure and higher system energy density.
Compared with energy storage systems with the same capacity, blade batteries can save more space.
The previously mentioned advantages and ten thousand cycle life of the 375Ah LiFePO4 battery of CUOFIHUANG No.1 are reflected in this cell.
The above is the measured data, charge discharge and heat dissipation comparison test.
It is mainly used for large-scale energy storage and industrial and commercial energy storage, with more restrictions in household energy storage.
Cubic Yinglong No. 1 polyanion sodium ion soft pack battery, with a capacity of 37Ah, has a lower capacity of sodium ion than lithium ion. After testing, both performance and stability are excellent, and the sodium ion cell is safer than the lithium ion cell.
Safety test list.
During the test, the 1C charging and discharging cycles were 1100 times, and the capacity retention rate and energy retention rate almost had no attenuation, and the energy efficiency was more than 95%.
Polyanion systemSodium ion batteryIt supports 5C charging rate, 10C discharge ratio>95%, - 40 ℃ environment>83%, and - 20 ℃ environment charging. At the same time, it has good dielectric performance in low temperature environment.
During the temperature test, it can be seen that the minimum capacity within the tested temperature range is not less than 83% through high and low temperature tests.
The sodium ion battery is safer than the lithium ion battery cell. At the same time, the sodium battery can be put at 0V voltage, which is safer during transportation.
0.2C to 3C charging curve and temperature rise curve.
Discharge ratio curve and temperature curve.
The capacity is maintained at 99% after circulation at 45 ℃.
Polyanion systemSodium ion batteryIts nominal voltage is lower than that of lithium ion battery, and its energy density is also lower.
Thanks to Meng Chenbao, vice general manager of Hunan Cubic New Energy Quality Center and Nafang Sales Center, for his speech.
Summary of charging head network
This speech introduces the advantages of blade battery scheme in the application of large storage in view of the current problems of uneven temperature difference and lower actual cycle life than the theoretical life of large storage systems;In view of the advantages of sodium electricity in low temperature resistance, high magnification, high safety and the disadvantages of low energy density, this paper introduces the solutions for the application of sodium electricity in household storage, industrial and commercial storage, ship power, etc.
Meng Chenbao, the vice general manager of Hunan Cubic New Energy Quality Center and Nafang Sales Center, gave a speech. It can be seen that the current development status and future of the sodium ion battery cell, although the energy density of the polyanion sodium ion battery is not as high as that of the lithium ion battery, it has better performance in safety, repeatability and high and low temperature environments,It is expected that the combination of polyanion sodium ion battery and blade battery will have better development in the future.