What are the performance requirements for Ni-MH batteries?

The important manifestations are as follows: 1. The power density should be large, that is, the instantaneous discharge performance should be better. Under the condition that the output voltage does not drop significantly, the greater the current supplied is ideal, which requires the internal resistance of the battery to be particularly small. The working current of the motor lu003dE/r+Zn is not only restricted by its impedance, but also closely related to the internal resistance r of the battery. Part of the electric power will be consumed by the internal resistance r and converted into heat, which will cause heat inside the battery. (2) The working voltage of the motor is grounded. E-Ir, will drop Ir. When the output current is required to be large (for example, the internal resistance of domestic 540 motors is generally about 0.5 ohms, while the internal resistance of AA nickel-metal hydride batteries is generally between more than 10 milliohms and 30 milliohms). The internal resistance of the battery will not be negligible . For electric model airplanes, batteries with low internal resistance must be used as much as possible to help improve the rapid discharge performance. 2. The energy density should be high. The so-called energy density refers to the capacity of the battery per unit mass, expressed in milliampere-hours/g or ampere-hours/kg; it is an important parameter to measure the battery, the larger the battery capacity of the same weight, the better. Regarding the model airplane, although the power of the same weight is used, the power is obviously increased; on the other hand, the same power can be achieved, but the weight of the model airplane is reduced, and the power ratio and flight effect are greatly improved. 3. The high current charging capability is better. For model aircraft enthusiasts, the flying environment is often in the wild, and its equipment and time are very limited. This requires the ability to replenish the battery in a short time, which is what we call the rapid charging capability. Because Ni-MH batteries have no memory effect, they do not need to be fully discharged like nickel-tin batteries. Therefore, IC current can be charged without discharging after a cycle of discharge to supplement the power. In addition, it should have good overcharge and overdischarge capabilities, and the self-discharge should be small. The capacity, internal resistance, self-discharge, temperature rise and other properties of each battery in the assembled battery pack must be strictly consistent to achieve the best results. The current situation of domestic nickel-hydrogen batteries At present, the processing of nickel-hydrogen batteries in the world is mainly monopolized by Japan. Our country has been processing since the beginning of the decade. The total output in 1996 was about 30 million. Compared with foreign products, the capacity is low. ICll%DOD cycle charge and discharge can not reach 500 times. The product uniformity rate is poor, which is not conducive to combination and the price is high. . However, since 1997, the quality of nickel-metal hydride batteries processed by some domestic manufacturers has been greatly improved. For example, Jining Boda Rare Earth Company and Zhuhai Taiyi Battery Company used the nickel-metal hydride battery processed by Professor Wang Jisan's infiltration electrode technology, which is used in electric model airplanes. In the flight test, the effect is quite satisfactory. The model used in the test is a modified p3A plus imported No. 05 motor. The propellers are D180 and H120 types, the take-off mass is 1000 grams, and the battery pack voltage is 7. ZV. From the test data, the capacity of the AA battery reaches 1400-1500 mAh, the internal resistance is 15-18 mAh on average, the self-discharge is less than 15%, the weight is 25 grams, the cost is reduced by 30%, and the price is lower than that of nickel. The steel battery is basically close. This is good news for model aircraft enthusiasts, and it can also lay a good foundation for replacing nickel-steel batteries. 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: What are the misunderstandings in buying rechargeable batteries?