NiMH can make batteries
1. In terms of weight, according to the voltage of each unit battery, nickel hydrogen and nickel cadmium are both 1.2V, while the lithium battery is indeed 3.6V, and the voltage of the lithium battery is three times that of the other two. And the weight of the same type battery is almost the same as that of the nickel-cadmium battery, but the nickel-nickel-metal hydride battery is relatively heavy. It can be seen that the weight of each battery is different, but due to the high voltage of 3.6V, the number of single batteries combined can be reduced by 1/3 when the same voltage is output, which reduces the weight and volume of the formed battery.
Second, the memory effect nickel-metal hydride batteries and nickel-cadmium batteries have the same memory effect. Therefore, regular discharge management is also necessary. This kind of periodic discharge management is handled in a fuzzy state, and even some discharges are carried out under incorrect knowledge (each discharge or the discharge after several uses varies depending on the company). This cumbersome discharge management It is unavoidable when using NiMH batteries. Compared with the lithium battery, there is no memory effect at all, so it is very convenient and simple to use. It does not need to pay attention to the residual voltage at all, it can be directly charged, and the charging time can naturally be shortened.
3. The self-discharge rate of nickel-cadmium batteries is 15-30% (month). The nickel-hydrogen battery is 25 to 35% (month), and the lithium battery is 2 to 5% (month). The self-discharge rate of the above nickel-metal hydride batteries is the largest, while the specialty of lithium batteries is extremely low compared with the other two types of batteries.
4. Charging methods NiMH batteries and lithium batteries cannot withstand overcharging. Therefore, the nickel-metal hydride battery is charged with a constant current in the PICK CUT control mode. When the charging voltage reaches the maximum, it is best to stop continuing to charge. The lithium battery is best charged with a constant current and a constant voltage. If the nickel-cadmium battery charger-DV control method is used for charging, the nickel-metal hydride battery and the lithium battery are charged.
5. The higher the capacity, the better?
Different types of batteries (especially different sizes), the higher the capacity, the longer the use time. Aside from the factors of volume and weight, of course, the higher the capacity, the better.
But for the same battery model, the nominal capacity (such as 600mAh) is also the same.The initial capacity measured is different: for example, one is 660mAh and the other is 605mAh, so is 660mAh better than 605mAh.
The actual situation may be that the capacity is high because there are more things in the electrode material that increase the initial capacity, and the things that are used to stabilize the electrode are reduced.The result is that after being recycled for dozens of times, the battery with a high capacity quickly loses capacity while the capacity is low The battery is still strong. Many domestic battery manufacturers often use this method to obtain high-capacity batteries. And the user's standby time after six months of use is very poor.
The civilian AA nickel-metal hydride batteries (that is, the No. 5 battery) are generally 1400mAh, but they also have ultra-high capacity (1600mAh), the same reason.
The price of increasing capacity is to sacrifice cycle life. Manufacturers are not in the context of modification of battery materials. It is impossible to truly "enhance" battery capacity. The study of specific surface area of ​​battery materials is very important. Only the BET method is used to detect the specific surface area of ​​battery materials. The test results are real and reliable. At present, there are many instruments in China that can only be tested by the direct comparison method, and now they are also eliminated in China. At present, the multi-point BET method is used uniformly for the specific surface area testing at home and abroad. The specific surface area measurement standards developed at home and abroad are based on the BET test method. Please refer to China's national standard (GB / T 19587-2004)-Gas adsorption BET principle Method for determining the specific surface area of ​​solid materials. The measurement of specific surface area is actually a time-consuming task. Due to the different adsorption capacity of the sample, the test of some samples may take a whole day. If the test process is not fully automated, then the tester ca n’t leave at all times. A high degree of concentration, observing the instrument panel, manipulating the knob, and a little inattention will lead to the failure of the test process, which will waste a lot of precious time of the tester. Beijing Jinaipu Technology Co., Ltd., and more importantly Beijing Jinaipu Technology Co., Ltd.'s F-Sorb 2400 specific surface area tester is by far the only fully automated intelligent specific surface area testing equipment in China. Its test results are in accordance with international consistency. It has high stability and good stability, while reducing human error and improving the accuracy of test results. The F-Sorb 2400 specific surface area tester is an instrument that can truly realize the detection function of the BET method (both with a direct comparison method)
Sixth, nickel-metal hydride battery maintenance and use 1. Under normal circumstances, the new nickel-metal hydride battery contains only a small amount of electricity, after you buy it, you must first charge and then use. However, if the battery has a short delivery time and sufficient power, it is recommended to use it before charging.
2. Newly purchased nickel-metal hydride batteries generally need to be charged and used 3-4 times to achieve the best performance. Many friends encounter small problems during the first charge. For example, the number of PP shots after the first charge is not. I imagine so much? After 3-4 times of charging and use, it was solved.
3. Although the memory effect of nickel-metal hydride batteries is small, it is still recommended that you try to recharge after each use, and it is fully charged at one time. Do not use it for a while and then recharge it. This is an important point of "prolonging life".
4. When charging the battery, pay attention to the heat dissipation around the charger. It is not necessary to use a fan to blow too deliberately, but it is important not to place too much debris around the charger. Ordinary users often do not have a special storage bag when using the battery; after replacing the battery, the user will habitually put the battery away regardless of whether the place is clean and wet. The consequence of this is that the battery is easy to get dirty, the contacts are easy to contact with the metal
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