The difference between nickel-metal hydride batteries, cadmium-nickel batteries, and lithium-ion batteries

The difference between nickel-metal hydride batteries, cadmium-nickel batteries, and lithium-ion batteries. There are many types of rechargeable batteries on the market. No. Take the battery as an example, the capacity is 500mAh, 600mAh, 700mAh, 850mAh, 1200mAh, 1300mAh. Different capacity batteries require different charging currents. Most of the general chargers on the market are designed for 500mAh and 600mAh batteries, and the charging current is between 60-70mA. At present, the most important form of battery on the market is 18650 lithium ion battery. (1) Weight The voltage of each battery is 1.2v for nickel-metal hydride batteries and nickel-cadmium batteries, and 3.6v for lithium-ion batteries. The voltage of lithium-ion batteries is three times that of nickel-metal hydride batteries and nickel-cadmium batteries. In addition, lithium-ion batteries are almost the same weight as cadmium-nickel batteries, while nickel-metal hydride batteries are heavier. However, since the terminal voltage of the lithium-ion battery is 3.6v, the number of a single battery pack can be reduced by 2/3 under the same output voltage, thereby reducing the weight and volume of the battery pack formed. (2) Memory effect Ni-Cd batteries have a memory effect, so regular discharge management is necessary. This kind of periodic discharge management belongs to the fuzzy state of passive management, and even the inaccurate discharge of nickel-cadmium batteries (discharge or discharge of nickel-cadmium batteries after several uses depends on different manufacturers and use of nickel-cadmium batteries). This cumbersome discharge management is unavoidable to use nickel-cadmium batteries. In contrast, lithium-ion batteries have no memory effect and are very convenient and simple to use. Don't consider the remaining voltage of the secondary battery at all, you can charge it directly, which naturally shortens the charging time. The memory effect is a major enemy of rechargeable batteries. It is generally believed that long-term incorrect charging of rechargeable batteries will cause premature aging of the battery. The memory effect can make the battery unable to be charged effectively, and the phenomenon that one is full and one is discharged. The method to prevent the memory effect of the battery is to strictly follow the principle of sufficient lightness, that is, the battery is best to be the remaining power light before charging, and it is charged to a sufficient amount. Generally speaking, nickel-cadmium batteries are prone to memory effect, so pay special attention to charging; in theory, nickel-metal hydride batteries have no memory effect, but it is best to follow the principle of sufficient light in use, which is why many chargers provide additional discharge Features. Regarding batteries with reduced capacity due to the memory effect, most batteries can be repaired by multiple recharging and recharging. (3) Self-discharge rate The battery life of nickel-cadmium batteries is 15%-30% per month, the battery life of nickel-hydrogen batteries is 25%-35% per month, and the battery life of lithium-ion batteries is 2%-5% per month. . Among the three types of batteries, the self-discharge rate of the Ni-MH battery is the highest, and the self-discharge rate of the Li-ion battery is the lowest. (4) Charging method The charging problem of rechargeable batteries has always been the focus of attention. Correct and good charging method to ensure battery life. There are many ways to charge rechargeable batteries. Different charging methods have different requirements for the circuit of the charger, which will naturally affect the production cost of the charger. The relationship between battery charging time and charging current is as follows: The charging time can be obtained by dividing the battery capacity by the charging current. Taking into account the loss during the charging process, the obtained charging time is multiplied by a factor of 1.2. 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: The impact of battery shell alloy content on battery performance