The low-temperature performance of lithium iron phosphate batteries has achieved a technological breakthrough. Low temperature is an obstacle to the promotion of electric vehicles in my country's great north and alpine regions. It is also a concern for power battery companies. Overcoming the low-temperature resistance of power lithium iron phosphate batteries has always been one of the key efforts of the industry. The low-temperature performance of lithium batteries continues to break through, and they are not afraid of cold weather!

　　Effect of low temperature performance of lithium iron phosphate battery

　　Take lithium iron phosphate batteries as an example. This type of battery has high safety and long cell life, but its low-temperature performance is slightly worse than batteries of other technical systems. Low temperature has an impact on the positive and negative electrodes, electrolytes and adhesives of lithium iron phosphate. For example, the lithium iron phosphate cathode itself has poor electronic conductivity and is prone to polarization in low-temperature environments, thereby reducing battery capacity. Affected by low temperature, the graphite lithium insertion speed is reduced, and metallic lithium is easily precipitated on the surface of the negative electrode. If the battery is left alone for insufficient time after charging, However, when it is put into use, all the metallic lithium cannot be embedded inside the graphite again, and part of the metallic lithium continues to exist on the surface of the negative electrode, which is very likely to form lithium dendrites and affect the safety of the battery;

　　In low-temperature environments, the viscosity of the electrolyte will increase, and the lithium ion migration resistance will also increase; in addition, in the production process of lithium iron phosphate batteries, the adhesive is also a very critical factor, and low temperature affects the performance of the adhesive. It will also have a greater impact.

　　Another problem caused by low temperature is reflected on the user side is the extension of charging time. When charging at low temperatures, the battery is prone to lithium precipitation, so before charging, the battery is generally heated slowly and the battery temperature rises to normal before charging. To solve the problem of low-temperature resistance of batteries, we usually start from three aspects: battery materials, cell design and PACK manufacturing to improve the low-temperature charge and discharge performance and cycle life of lithium.

　　The low-temperature performance of lithium iron phosphate batteries has achieved a technological breakthrough

　　Compared with power batteries, special lithium iron phosphate batteries have higher performance requirements for product safety, reliability and low temperature resistance, and also have strict qualification requirements for enterprises.

　　Tianneng once again made new breakthroughs in technological innovation of lithium iron phosphate batteries, successfully overcoming the technical bottleneck of low temperature for lithium iron phosphate batteries, and obtained certification from the National Product Quality Supervision Bureau, arousing strong repercussions in the industry. According to the lithium battery R&D personnel of Tianneng Group, the cost of separator materials in lithium iron phosphate batteries is very high, but the quality of the separator affects the performance, life and reliability of lithium batteries.

　　Tianneng technicians have successfully broken through the technical bottleneck of lithium iron phosphate batteries by improving the process formula, optimizing the structural design, and matching high-quality materials. The new generation of lithium batteries developed has been tested and has not only performed well in charge rate and discharge rate, but also accelerated its speed. Performance, charging time, safety performance, etc. all show stronger advantages, and it also performs well in low-temperature discharge. The energy released at minus 20 degrees Celsius reaches more than 80%, far exceeding the national standard of 60%.

　　Tianneng Group began to devote itself to the research, development and production of lithium batteries as early as 5 years ago. Relying on Tianneng's national postdoctoral workstation and academician workstation, the independently developed lithium iron phosphate power batteries have successively made great achievements in the safety, positive and negative performance of large-capacity lithium-ion power batteries. Breakthroughs have been made in polar materials and electrolyte research: it does not fire, burn or explode under extreme conditions such as extrusion, acupuncture, short circuit, etc.

　　Lithium titanate battery

　　As a type of lithium battery, lithium titanate battery has excellent low temperature resistance. The lithium insertion potential of the spinel-structured lithium titanate negative electrode material is about 1.5V, and lithium dendrites will not be formed. The volume strain during the charge and discharge process is less than 1%. Nanosized lithium titanate batteries can charge and discharge at high currents, achieving low-temperature fast charging while ensuring battery durability and safety.

　　Lithium titanate batteries have excellent low temperature resistance. Lithium titanate batteries have normal charge and discharge capabilities in the temperature range of -50~60°C, and have good low temperature resistance. Lithium titanate batteries have become my country's pioneer in promoting new energy vehicles in cold areas due to their excellent low-temperature resistance. At present, many ternary lithium batteries also have low-temperature resistance, and lithium titanate batteries are the best in low-temperature resistance. The low-temperature bottleneck in the promotion of electric vehicles will also be gradually solved.

　　Lithium iron phosphate batteries have the advantages of high specific energy, high specific power, high energy conversion efficiency, and long cycle life. However, they currently have the problem of difficulty in discharging and charging at low temperatures. There are certain risks in battery charging in low temperature environments. Therefore, industry insiders recommend that you try to avoid charging lithium-ion batteries at low temperatures. When the battery must be charged at low temperatures, it is necessary to choose as small a current as possible (i.e. slow charge) to charge the lithium-ion battery.

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