1. What is the capacity?
During the manufacturing process of the battery, the actual capacity of the battery may not be completely consistent due to process reasons. The process of classifying the battery capacity by a certain charge and discharge system is called distributing.
2. What is the pressure drop?
The battery is qualitatively charged to more than 80%, and its battery no-load voltage is measured. The 5W/2W battery is used as a load to connect the positive and negative terminals of the battery as an open circuit of the battery, and the devices of the path are connected in series. The voltage drop of 5 seconds after the switch is turned on is not more than 0.4V, which is mainly for testing the battery load performance.
3. What is a static resistor?
The internal resistance of the battery during discharge
4. What is dynamic resistance?
That is, the internal resistance of the battery during charging.
5. What is the load capacity of the battery?
When the positive and negative ends of the battery are connected to the electric appliance, the output power when the electric appliance is operated is the load capacity of the battery.
6. What is charging efficiency? What is the discharge efficiency?
Charging efficiency refers to the measure of the amount of chemical energy consumed by a battery during its charging process into a chemical energy that the battery can store. Mainly affected by the process of the battery, the formulation and the working environment temperature of the battery. The higher the general ambient temperature, the lower the charging efficiency.
The discharge efficiency refers to the ratio of the actual electricity discharged to the rated voltage discharged under a certain discharge condition to the rated voltage, which is mainly affected by factors such as discharge rate, ambient temperature and internal resistance. In general, when the discharge rate is high, the discharge efficiency is lower. The lower the temperature, the lower the discharge efficiency.
7. What is the difference between the various rechargeable batteries that are currently common?
At present, nickel-cadmium, nickel-hydrogen, and lithium-ion rechargeable batteries are widely used in various portable electrical devices (such as notebook computers, video cameras, and mobile phones), and each rechargeable battery has its own unique chemical properties. The main difference between nickel-cadmium and nickel-hydrogen batteries is that nickel-hydrogen batteries have higher energy density. Compared with the same model battery, NiMH battery capacity is twice that of nickel-cadmium battery. This means that the use of NiMH batteries can greatly extend equipment operating time without adding extra weight to power equipment. Another point of nickel-metal hydride batteries is that A greatly reduces the "memory effect" problem that exists in cadmium batteries, making nickel-metal hydride batteries more convenient to use. Ni-MH batteries are more environmentally friendly than nickel-cadmium batteries because they have no toxic heavy metal elements inside.
Li-ion has also quickly become the standard power source for portable devices. Li-ion can provide the same energy as NiMH batteries, but it can reduce the weight by about 35%. This is for power devices such as cameras and laptops. It is said to be crucial. Li-ion's lack of "memory effect" and the absence of toxic substances is also an important factor in making it a standard power source.
8. Comparison of technical parameters of Ni, Cd, NiMH and Li-ion.
Battery Type Item Nickel Cadmium Rechargeable Battery Nickel Hydrogen Rechargeable Battery Lithium Ion Rechargeable Battery
1.2 1.2 1.2 3.6
Weight ratio energy 50 65 105-140
Volumetric energy 150 200 300
Charge and discharge life 500 500 1000
Self-discharge rate (%) 25-30 30-35 6-9
Is there a memory effect?
Whether there is pollution or not
Note: Charging rate is 1C
9. What are the “green batteries” currently in use and research?
The new green battery refers to a class of high-performance, pollution-free batteries that have been put into use or are being developed in recent years. Lithium-ion batteries, metal hydride nickel batteries, and mercury-free alkaline zinc-manganese batteries that are currently being used in large quantities, as well as lithium or lithium-ion plastic batteries, combustion cells, and electrochemical energy storage supercapacitors that are being developed are all emerging. The scope of green batteries. In addition, solar cells that use solar energy for photoelectric conversion have been widely used at present.
10. What battery will dominate the battery market?
With the camera, mobile and cordless electrification, notebook computers, multimedia devices with images and sounds occupy an increasingly important position in household appliances. Compared with primary batteries, secondary battery rechargeable batteries are also widely used. In these areas. The secondary rechargeable battery will develop in the direction of small size, light weight, capacity and intelligence.