The manufacturing process of 3C lithium batteries is divided into four procedures, the first is pole piece production, the second is cell assembly, the third is cell activation detection, and the fourth is cell activation detection. is the packaging of the batteries. Cell activation includes battery formation, capacity division and testing. This is a key process after the 3C lithium battery is manufactured and before it is packaged and shipped. The process flow of 3C lithium battery can be divided into positive electrode slurry, negative electrode slurry, positive electrode sheet, negative electrode sheet, steel case assembly, liquid injection, testing, packaging, etc.
When performing performance tests on 3C lithium batteries, a media capable of transmitting current is usually used. For example, the high current shrapnel microneedle module peu transmit current between 1-50A in mobile phone lithium battery test, and has good connection function and it has reliable response method in the field of small steps, and it can; manage steps of ≤0.2 mm. Maintain a stable connection, no stuck pins, no stuck pins and reliable connection performance.
Why are side sealing and top sealing different from pre-sealing?
The forming process is a small current charge that activates the activity of the material. The training process is a key process, and. every manufacturer is different, so I can't explain the training process to you.
Regarding capacity classification, batteries from domestic manufacturers have poor consistency, so they need to be sorted.
If you talk about the specific operation of the operator, it is actually installing the battery on thechemical composition cabinet.
In the manufacturing process of lithium-ion battery, there is a workstation that divides the capacity. In simple terms, it is sorting out the battery capacity. This implies what the capacity of the battery is. Actual capacity is usually measured by the time it takes the battery to discharge the battery voltage from 4.2 V to 3.0 V with a current of 1C5 (5 is the index) A, represented by C5 (5 is the index). The nominal capacity (or nominal capacity) of the battery. This capacity represents the capacity specified by the battery cell or battery label. This means the battery cell or battery can last for 5 hours. provided that the ambient temperature is 23℃±2℃ The amount of electricity supplied when discharging to the final voltage at a rate (0.2 ItA). Capacity classification is a process of checking the actual capacity of the battery. ContactRarely when charging, the actual capacity of the battery can only be measured by the discharging process. The 1C5 (5 is the index) A discharge performance required in GB/T18287-2000 has a discharge time of at least 51 minutes. But the industry generally takes 60 minutes as the minimum requirement.
The battery does not need to be divided into volumes before it can be used. In the entire manufacturing process, when the battery reaches the volume division point, it has basically been manufactured and can be used directly. The division only determines the actual battery capacity, just for testing purposes.
How to make lithium-ion batteries? What is the process?
Why are side sealing and top sealing different from pre-sealing?
1. Pit punching
The above-mentioned soft lithium battery uses aluminum-plastic film as the outer casing,so that the processing of aluminum-plastic film becomes a process. Flexible packaged lithium ion batteries can be designed in different sizes according to customer needs. After the overall dimensions are designed, the corresponding molds need to be opened to form the aluminum-plastic film. The process is also called pit punching, which is to use a forming mold to cut out a pit on the aluminum-plastic film that can contain the core during heating.
2. Top and side seals
Top and side seals are divided into top seals and side seals. Firstly, put the finished roll core into the perforated pit, then fold the packaging film in half, put the whole aluminum-plastic film into the clamp, and do the top and side sealing in the top sealing machine and lateral. When packing, both heads have a certain temperature (geargenerally around 180°C). When closed, they are pressed against the aluminum-plastic film. The PP layer of the aluminum-plastic film melts and then sticks together, so that the aluminum-plastic film melts. the packaging is OK. The top seal serves to seal the tab, which can be accomplished with a small component of tab glue on the tab. When packaging, the PP of the tab glue and the PP layer of the aluminum-plastic film melt and bond to form an effective packaging structure. There's actually not much to say about the side seals, which are similar to the top seals. After the battery core is sealed on the top side, there is only an opening on the airbag side, which participates in the next step.
3. Liquid injection and pre-sealing process
After the battery core is packed in soft packaging sealed on the top and side, an x-ray is requirede to check the parallelism of the kernel. , then enter the drying room. The humidity is gone. After letting it sit in the drying room for a while, it enters the liquid injection and pre-sealing process. During the sealing process on the top and side of the battery core, there is an opening for the airbag. This opening is used for liquid injection. After the liquid injection is completed, the airbag side should be immediately pre-sealed, also called a seal. Once the package is complete, the battery core is theoretically completely isolated from the external environment. A seal is similar to the top and side seals.
4. Fastener resting, forming and shaping process
After the liquid injection and sealing are completed, the battery core should be left to rest. Depending on the process, it will. be divided into high temperature Let it sit and leavez-rest it at room temperature. The purpose of rest is to allow the injected electrolyte to fully infiltrate the pole piece. The battery core can then be used to make chemicals. Charging is the first charge of the battery, but it will not charge at the highest voltage used and the charging current is also very low. The purpose of the formation is to form a stable SEI film on the electrode surface, which is equivalent to a “activation” process of the battery core. After formation, certain cells, particularly thick cells, may undergo certain deformations due to significant internal stresses. Therefore, some factories will implement a fixture shaping process after training, also called fixture baking.
How harmful is the coating process of lithium batteries to the human body?
Composants of lithium-ion batteries
(1) Battery upper and lower covers< /p>
(2) Positive electrode - the active material is usually lithium cobalt oxide
(3) Separator - a special composite membrane
(4) Negative electrode - active material The substance is carbon
(5) Organic electrolyte
p>(6) Battery shell (divided into steel shell and aluminum shell)
Small-scale The usual process for making lithium batteries in mobile phone repair shops, the corresponding zinc shell must be cut according to the size and shape of the battery required on a small template. The inner surface of the zinc shell is covered with a composite layer and a separator., then attach the positive and negative electrodes to the inner surface of the zinc shell (connect the ballast microcircuit if necessary), then cover and secure the entire hull in placezinc, finally fill it with electrolyte, seal it, then cover it with plastic packaging
< p>The coating process of 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 volatile gases may 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 practically no impact on the body (certain workstations must be exposed toorganic 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 welding the tabs ofs laminated batteries (up to 2-3 layers of pole pieces), but ultrasonic power and time 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 the overall performance of lithium batteries and capacitors, but it cannot be used as the main factor to change some aspects of battery performance, such as the energy density of the battery. battery, performance at high and low temperature, high voltage, etc.
Reference for the above content: Baidu Encyclopedia-Lithium Battery