Comparison and analysis of the advantages and disadvantages of nickel-metal hydride batteries and polymer batteries

The design of nickel-metal hydride batteries is derived from nickel-cadmium batteries, but there are great changes in improving the memory effect of nickel-cadmium batteries. The most important change is the replacement of the cadmium used in the negative electrode with hydrogen storage alloys. Therefore, the nickel-hydrogen battery can be said to be a typical representative of material innovation. The pollution caused by nickel-metal hydride batteries is much less than that of nickel-cadmium batteries containing cadmium. Therefore, nickel-cadmium batteries have been gradually replaced by nickel-metal hydride batteries. Except for a few lithium batteries that can be used once (NIKONEN-EL1 and 2CR5), most of the lithium batteries have no alternative to batteries. This is about going abroad for a long time or a large number of users is very troublesome. Ni-MH batteries have no such problem. , Digital cameras that use nickel-metal hydride batteries can usually be replaced by alkaline batteries. Recently, digital cameras use more and more nickel-metal hydride batteries. Battery manufacturers are also optimistic about the market development prospects. They have launched high-capacity nickel-metal hydride rechargeable batteries. This has led to the rapid development of nickel-metal hydride battery technology and increasing capacity. The time is on par with that of lithium batteries, and even the charger has become more sophisticated, and the charging time has been drastically shortened. u200bThe polymer lithium battery drives the gearbox with sufficient strength and stability, long endurance, and smaller space than the above two batteries. But pay attention to the use of polymer lithium batteries (please pay attention to remember): the battery cannot be over-discharged (the over-discharge mentioned here means that the battery should not be hit with the gear box), the polymer lithium battery will swell if over-discharged Or it can’t be charged. If this happens, the battery will be useless and can no longer be used continuously; in order to test the lithium battery power, a digital display chip is usually installed on the battery box or the water bomb. Let’s talk about the water bomb first. The gun uses a polymer lithium battery with two common voltage parameters: 7.4V and 11.1V, then the overflow power display for the 7.4V parameter is about 8.5V; the overflow power display for the 11.1V parameter is about 12.2V. According to my personal experience, the 7.4V battery shows 6.70V without any action on the power. So I will take it out for charging, and the 11.1V battery shows 10.20V so it can be taken out and charged. Up. Advantages of Ni-MH battery 1. Overcharge and over-discharge resistance, 2. Strong high-speed discharge ability, 3. Safe to use, especially under abuse conditions; 4. Relatively cheap; 5. Disadvantages of high power density 1. Low voltage 2. , The advantages of low energy density polymer lithium battery 1. The working voltage of the single battery is as high as 3.6v~3.8v, which is much higher than the 1.2V voltage of nickel-hydrogen and nickel-cadmium batteries. 2. The capacity density is large, and its capacity density is 1.5~2.5 times or higher than that of nickel-hydrogen battery or nickel-cadmium battery. 3. The self-discharge is small, and its capacity loss is also small after being placed for a long time. 4. Long life, the cycle life can reach more than 500 times in normal use. 5. There is no memory effect, it is not necessary to empty the remaining power before charging, which is convenient to use. 6. Good safety performance. Disadvantages of polymer lithium batteries 1. High battery cost and difficulty in purifying electrolyte system 2. To protect circuit control, overcharge or overdischarge will destroy the reversibility of the chemical substances inside the battery, which will seriously affect the battery life. 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: Analysis of the advantages and disadvantages of cylindrical lithium batteries