Measurement of density of a pole piece 1. Principle of measurement: The mass of the pole piece per unit area is called the areal density of the pole piece. The areal density of the pole pieces is the most important factor in determining battery consistency. When beta rays produced by the decay of Kr85 (krypton 85) enter the pole pieces of the battery, part of the rays are absorbed by the pole pieces. As a result, the intensity of the rays which penetrate the pole piece presents a certain attenuation compared to the intensity of the incident rays. The attenuation ratio has a negative exponential relationship with the surface density of the penetrated pole piece. By detecting the intensity of the rays before and after the rays penetrate the pole piece in an ionization chamber filled with a special gas, the surface density of the pole piece can be calculated.
2. Advantages: In raiDue to the unique penetrability of beta rays, their natural and stable characteristics and the low cost of their further use, it is currently recognized internationally as the most accurate, reliable and economical measurement method.
3. Suitable coating types: single-space coating, multi-space coating, continuous coating, single-sided coating, double-sided coating
Measuring method: non-dynamic online. contact measurement - Dongguan Jiayi automation equipment. I hope it will be adopted. Thanks
Which instrument is needed to measure surface density?
The coating process for lithium batteries is dangerous. Lithium-ion batteries are absolutely harmful to the human body. The most harmful thing is the electrolyte solution. The electrolyte is a volatile organic liquid and is obviously corrosive. Prolonged inhalation of gaslatils can cause damage to the respiratory tract.
If you manufacture battery cells, the contents inside the battery cells are harmful to the human body. It is not recommended to go there. You must wear a gas mask or face mask when you go there. work. I used to unknowingly open a bucket of stack ingredients, smoke it, and not be able to eat for a whole day. If you do PACK, it has virtually no impact on the body (some workstations must be exposed to organic solvents). ). It's harmful.
Remarks
Storage requirements: In an environment with a temperature of 20 ± 5 ℃ and humidity not exceeding 50%, corrosion of the aluminum foil by the Air and water vapor should be avoided during transportation.
This product is divided into two types, A and B. The main characteristics of each are: the appearance of type A is black, the conventional coating thickness is 4-8μm on both sides, and the conductive performance is more remarkable; the appearance of type B is light gray, and the conventional coating thickness is 2-3μm on both sides. Fewer welding layers can be done in the cladding area and the cladding machine can identify skip gaps.
Type B (gray) carbon coated aluminum sheet can be ultrasonic welded directly in the coating area. It is only suitable for soldering laminated battery tabs (up to 2-3 layers of pole pieces), but the power and time of ultrasound require fine tuning.
The heat dissipation of carbon layer is worse than that of aluminum foil, so the belt speed and baking temperature should be adjusted appropriately when coating.
This product can significantly improve poverall performance of lithium batteries and capacitors, but it cannot be used as the main factor to change some aspects of battery performance, such as battery energy density, high and low temperature performance, high voltage, etc.
Reference for the above content: Baidu Encyclopedia - Lithium Battery
Measuring surface density requires the use of a surface density measuring instrument. surface density. For example, Dacheng's precision X/β surface density measuring instruments can be used for measuring the surface density or thickness of lithium battery cathode coating, lithium battery separator coating and papermaking. The measurement principle is to use the absorption and backscattering effects of X-ray penetrating materials to achieve non-destructive and non-contact measurement of the densitysurface ity of thin layer materials.