Why high-rate batteries? High-rate battery applications

Why a high-rate lithium-ion battery? High-rate lithium-ion battery application field. High-rate lithium-ion batteries are one of high-rate discharge batteries. They mainly include high-rate lithium iron phosphate batteries and high-rate polymer lithium-ion batteries. They have their own advantages and disadvantages, so the application fields overlap. There are also differences. They are all UAVs, airplanes, rc car models and other products that use high-rate lithium-ion batteries. The batteries have excellent overall performance and quality. They are well-known brands in the field at home and abroad and are widely loved by consumers. Why a high-rate lithium-ion battery? High-rate batteries generally refer to lithium-ion batteries. Lithium-ion batteries are high-rate rechargeable batteries that rely on lithium ions to move between the positive and negative electrodes to work. During charging and discharging, Li+ is intercalated and deintercalated back and forth between the two electrodes: when recharging the battery, Li+ is deintercalated from the positive electrode and inserted into the negative electrode via the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Batteries that generally use materials containing lithium as electrodes are representative of modern high-performance batteries. Fast charging of ordinary rate batteries can easily cause lithium in the negative electrode, resulting in faster degradation of lithium-ion battery performance, and in severe cases, it can cause internal short circuit of the battery, causing fire and explosion. Most consumer applications only require a 1C battery. If a higher discharge rate and faster charging time are required, a high-rate battery is the best choice. Advantages of high-rate lithium-ion batteries ①It has the characteristics of excellent high-current discharge performance, sufficient explosive power, high discharge platform, and good cycle life; ②It has high energy density and adopts laminated technology, which is more conducive to the rate due to its low internal resistance. Charge and discharge, high-efficiency output performance; ③Supply higher discharge rate, up to 45C, better temperature stability during discharge, controlled within 65 degrees Celsius to prevent overheating and damage; ④Lithium-ion battery is ultra-thin and bulky Small and light weight, it can be made into special-shaped batteries of various shapes and capacities, and the thickness can be 0.45mm. High-rate lithium-ion battery applications. High-rate lithium-ion batteries mainly include iron phosphate lithium-ion batteries, polymer lithium-ion batteries and nickel-metal hydride batteries. The first two are soft-packed aluminum film forms, and the last one is steel. The shell is cylindrical. These three high-rate batteries are widely used in 3C electronic products, model entertainment, power tools, unmanned aerial vehicles, industrial power supplies and other fields. With excellent comprehensive strength and high-quality services, they are widely praised by partners. With the development of the industry, there is a demand for higher rate and faster charging of lithium-ion batteries, which has promoted the technological improvement and application of rate batteries. At present, high-rate batteries are widely used in aerial photography drones, agricultural plant protection drones, emergency starting power supplies, model airplanes, power tools, etc. There is a layer of SEI film on the surface of the negative electrode of a lithium battery. In fact, the rate performance of a lithium battery is largely controlled by the diffusion of lithium ions in the SEI film. Since the polarization of the powder electrode in the organic electrolyte is much more serious than that of the water system, lithium is likely to be deposited on the surface of the negative electrode under high-rate or low-temperature conditions, which brings serious safety hazards. In addition, under high-rate charging conditions, the crystal lattice of the positive electrode material is easily damaged, and the graphite sheet layer of the negative electrode may also be damaged. These factors will accelerate the attenuation of the capacity and seriously affect the service life of the lithium-ion battery. High-rate lithium-ion batteries are suitable for use in some light equipment, to achieve a rapid increase in the operating speed of the equipment, such as competitive drones, light track racing, water electric skateboards, etc.; or used in some power tools, such as electric power steering, etc. Yes, as long as the high rate discharge in a short time is enough to make the fasteners loose. High-rate lithium-ion batteries are currently unable to provide long-lasting high-current discharge, which can easily cause failures or accidents when the battery is too high temperature. The military application of lithium-ion batteries that can be charged at a high rate is mainly aimed at the current situation of long waiting time for secondary power consumption of tactical portable equipment, waste of battery resources, and restricted rapid response capabilities. The promotion and use of high-rate rechargeable lithium-ion batteries have good potential and prospects, but the current system should be taken into consideration, and the advantages of active lithium-ion batteries in terms of cost performance, circuit control, safety, high and low temperature charge and discharge, and cycle life should be consolidated on the basis of advantages , Realize high rate charging reasonably and safely.