In the next 2~3 years, ESS battery cells will continue to upgrade to higher capacity, the cell capacity is expected to increase to more than 300Ah, which will put higher requirements on battery technology, production and materials. For now, these ESS large battery cells are prismatic cells. According to the difference of cell assembly process, prismatic cells can be divided into two categories: stacked battery cells and wound battery cells. So, what is the difference between stacked battery cells and wound battery cells？The following is battery electrode lamination & stacking process VS battery electrode winding process, showing the advantages and disadvantages of each. The battery winding process has been developed over a long period of time and has the following advantages. The industry chain supporting the battery winding process is very mature and the investment cost is relatively smaller. Battery electrode winding technology is very mature, the battery electrode winding machine has been highly automated, and its production efficiency and yield rate are also very high. As the cell capacity and size continue to increase, the disadvantages of the battery winding process become more apparent. Wound cells have curvature at the corners, resulting in lower space utilization than stacked cells, and the larger the battery capacity, the more obvious the space waste. Wound cells have curvature at the C-corners, and the cell is prone to wavy deformation, which will lead to poor battery interface and uneven current distribution, accelerating the decay of battery life. After the bending of the electrodes of the wound cells, the coating material undergoes large bending deformation, which will easily induce problems such as powder dropping and burring, and this will increase the risk of internal short circuit and thermal runaway of the battery. As the cell capacity and size continue to increase, the requirements of wound battery cells for battery manufacturers' extreme manufacturing will rapidly increase, and the difficulty of compatibility between high-capacity battery cells and the winding process will steeply increase. Below are the features of the battery lamination & stacking process. Firstly, the advantages. The number of battery tabs in stacked cells is twice that of wound cells. The increase in the number of battery tabs results in shorter electron transfer distance, 10%~15% lower resistance compared to wound cells, less heat generation, and longer theoretical cycle life, meeting the requirements of mass ESS for high safety and ultra-long cycle life. Stacked cells do not have the problem of C-corners in the process of cell assembly, which can make full use of the space at the corners of the battery shell and improve the volumetric energy density and mass energy density. The stacked cell does not have the problem of unbalanced internal stress in the C-corners, and each layer of electrodes can maintain a relatively flat interface during long-t...

What is clear is that the top ten EV battery cell manufacturers in the world in terms of installed battery capacity are all concentrated in the three countries of China, Korea and Japan. The development of lithium-ion battery cell manufacturing in other regions of the world is relatively slow. In countries outside of China, Japan and Korea, there are many challenges and bottlenecks faced by emerging battery cell manufacturers, such as lack of technology base, industry chain, core technical personnel and construction experience, etc. Challenge 1: Lack of technical foundation European battery cell manufacturers: They are years behind Asia in terms of technology reserves of core materials for battery cells, such as battery anode active materials, battery cathode active materials, battery electrolyte and battery separator, etc. Battery cell manufacturers in Southeast Asia and South Asia: Lack of local leaders of large battery cell manufacturers and related technology accumulation. Challenge 2: Lack of industry chain support U.S. battery cell manufacturers: raw materials such as battery anode active material, battery cathode active material, battery electrolyte and battery separator are all dependent on imports. European battery cell manufacturers: raw materials such as battery electrolyte and battery separator are dominated by Asian producers. Challenge 3: Lack of core talents North American battery cell manufacturers: lack of skilled engineers in manufacturing, need to bring in skilled personnel, higher cost required. European battery cell manufacturers: overall labor shortage, need to bring in talents from Asia, but the labor visa application process is more complicated. Challenge 4: Lack of construction experience U.S. battery cell manufacturers: the hollowing out of manufacturing makes production costs high, A123 has tried to move the battery production line back but suffered serious losses, and was eventually acquired by Chinese companies. European battery cell manufacturers: lack of systematic methodology support in integration, tuning, calibration, cost control, etc. WinAck Group can provide full set of battery production line solutions. Come by, contact us for a solution that can help you succeed. For better batteries, Win & Ack!

Since 2022, electricity prices in major regions of the world have risen significantly under the impact of the energy inflation crisis and geopolitical conflicts in Eastern Europe, and the demand for residential energy storage system is still growing rapidly. In terms of product performance requirements, on the premise that electrical safety and mechanical safety are met for residential energy storage system, the performance requirements focus on long cycle life, wide temperature adaptability, charge-discharge rates, and high volume energy density. The high voltage product platform is an important trend in the development of residential energy storage system. The high voltage can reduce the current, thereby reducing the heat release, and improving the discharge efficiency and safety. The capacity of the residential ESS is expected to gradually increase from below 10KWh to above 15KWh.   Residential Energy Storage System Performance Requirements Items Performance Requirements Cycle life The warranty period of Residential ESS is generally 8 to 10 years, and the design life is 10 to 15 years. Therefore, the cycle life of the ESS system is generally not less than 6,000 times, and the high-end products are not less than 10,000 times. The battery cycle life tester can perform the cycle life test of ESS batteries. Wide temperature adaptability In areas with great climate change, such as high latitudes, the temperature in winter is as low as -10℃, and the temperature in summer is as high as 40℃, and the temperature difference is large. This requires that the battery cells have wide temperature adaptability and can still be charged and discharged normally in high and low temperature climates. The battery high and low temperature test chamber can provide high and low temperature environment simulation, so as to carry out the battery performance test. Charge and discharge rate Residential ESS is usually used in combination with photovoltaic power generation systems. The battery cells need to meet the needs of charging and discharging in a short time, and the charging and discharging rate is generally 0.5C~1C. High volume energy density The system design of the Residential ESS requires a high degree of integration, and the high volumetric energy density can reduce the ESS's footprint. System intelligence The system status can be monitored in real time, and the charging and discharging capacity can be viewed; external virtual power plants and microgrid systems can be connected. WinAck Group can provide Residential Energy Storage System manufacturing solutions such as battery pack production line, battery cell test equipment, battery pack test equipment. Come by, contact us for a solution that can help you succeed. For better batteries, Win & Ack!