The difference between Ni-MH battery and Li-ion battery

The difference between nickel-metal hydride batteries and lithium-ion batteries? The development of batteries has two important historical periods: primary batteries and rechargeable batteries. So far, these two historical periods are divided into different stages: primary batteries include carbon electricity and alkaline batteries, and secondary batteries include lead-acid batteries, nickel-cadmium batteries, nickel-hydrogen batteries, and lithium-ion batteries. Among them, lead-acid batteries are the only system, and nickel-cadmium/nickel-metal hydride/lithium-ion batteries have technological inheritance and time continuity. In practical applications, lithium-ion batteries are actually developed on the basis of gradually surpassing nickel-hydrogen batteries. In summary, the overall advantage is convenience and durability. The following is a comparison between lithium-ion batteries and nickel-metal hydride batteries: 1. High energy density: The volume of nickel-metal hydride batteries is between nickel-cadmium batteries and lithium-ion batteries, reflecting the commercial nature of nickel-metal hydride batteries. Due to the difference in energy density, that is, the energy stored in the same volume, lithium-ion batteries are three times that of nickel-hydrogen batteries. 2. Self-discharge: Self-discharge refers to the loss of power when the battery is not in use. The self-discharge of nickel-hydrogen batteries and lithium-ion batteries is not large, but self-discharge of nickel-hydrogen batteries is more common, and self-discharge will shorten the battery life and terminate early. Therefore, about ten years ago, nickel-hydrogen batteries with low self-discharge were a bright spot in the promotion of nickel-hydrogen batteries, while the self-discharge of lithium-ion batteries was almost negligible, due to the natural difference in chemical properties caused by the materials used. 3. No memory effect: Ni-MH battery has obvious memory effect. Human memory is the impression left by the brain. The same is true for nickel-metal hydride batteries. Incomplete discharge or unsatisfactory charging will cause the battery to remember only incomplete and unsatisfactory states for a long time. The performance of the application is capacity degradation. This is not the case with lithium-ion batteries. Therefore, nickel-metal hydride batteries have to undergo a thorough deep discharge at regular intervals to clear the memory left behind, which is similar to human brainwashing. Lithium-ion batteries can be charged at any time, so lithium-ion batteries are a happy battery, and our users are very happy. 4. High charge and discharge platform. The voltage of a single lithium-ion battery is 3.6V, and the voltage of a single nickel-hydrogen battery is 1.2V. Lithium-ion batteries are charged by setting the terminal voltage, which is usually a 4.2v single unit. Ni-MH batteries have no voltage rise and fall. The charging method of lithium-ion batteries is called voltage and current limitation (voltage and current), while nickel-metal hydride batteries have a low voltage platform and are usually charged by constant current (constant current). Because the charging methods are different, the Li-ion battery charger and the Ni-MH battery charger cannot be used together. 5. Standardize specificity. Nickel-metal hydride batteries are often called nickel-metal hydride batteries, while lithium-ion batteries are rarely called nickel-metal hydride batteries. This is because lithium-ion batteries are mainly used in products with large market capacity. If they are applied to products with small market capacity, not only are there technical problems, but cost sharing is also a problem. Still improving technology and market scale issues, in the lithium-ion battery industry, some companies are already actively engaged in new areas of lithium-ion applications. For example, Dongguan Threat and Electronics Co., Ltd., a custom-made lithium-ion battery manufacturer, is starting A special Ru0026D and production battery is a specific measure to adapt to this trend. It is believed that similar practices will become one of the common phenomena in the industry in the near future. The differences in the above five aspects are all reflected in the advantages of lithium-ion batteries. However, different forms of battery products have their own inevitability due to their different chemical properties, so they will not be completely replaced by other forms of batteries. For example, in the field of high-current instantaneous discharge, nickel-metal hydride batteries are superior to lithium-ion batteries, including medical equipment, emergency equipment, and power tools. In larger applications, nickel-metal hydride batteries can also be used in new energy hybrid vehicles, although research in this area has yet to be completed. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous article: Does the new rechargeable battery need to be charged for 8-12 hours?