Difference between Ni MH battery and lithium battery
Ni MH battery has more obvious advantages than lithium battery.
The electrolyte in the Ni MH battery is a non combustible aqueous solution. On the other hand, the specific heat capacity of the Ni MH battery is relatively high and the energy density is relatively low, which means that the Ni MH battery will not easily catch fire even in extreme cases such as short circuit.
Difference between Ni MH battery and lithium battery:
Rechargeable lithium battery is widely used in many new mobile devices because it has the advantages of small volume (relative), light weight, low self discharge rate and no memory effect. The batteries of mobile phones, laptops, PDAs and other mobile devices we usually use have been gradually replaced by lithium batteries. The memory effect of Ni MH battery is not very obvious. For one thing, it is not necessary to recharge after discharge in case of emergency. It is best to recharge after discharge in normal use.
2. Electric quantity
Lithium battery has large specific energy and small battery; The voltage of single lithium battery is 3 times that of Ni MH battery; No memory effect, can be used and charged at any time. However, it can not be charged at once. In this way, too many times of charging and discharging will affect the service life of the battery. Lithium batteries should not be stored for a long time, and part of their capacity will be lost permanently after a long time. It is best to store it in the refrigerator after charging 40%.
3. Charging method
The charging requirements of lithium batteries are different from those of nickel cadmium / nickel hydrogen batteries. The single voltage of rechargeable lithium batteries is 3.6V (some battery blocks may have a nominal voltage of 3.7V). With the full charge of the battery, the voltage of the lithium battery will rise slowly, which is also a sign to judge whether the lithium battery is full. Generally, the manufacturer recommends stopping the charging voltage to be 4.2V (in the case of a single lithium battery).
The reason why Ni MH battery can become the first choice of many cars is that it has incomparable safety and reliability. On the one hand, the electrolyte of Ni MH battery is a non combustible aqueous solution. As a mature battery product, Ni MH battery has low difficulty in product quality control and high yield.