The manufacturing process of 3C lithium batteries is divided into four procedures:
The basis is the production of pole pieces
The core is the assembly of the battery
The key The first step is the activation of the battery cells, which includes battery formation, capacity division and testing
The last step is the packaging of the battery, which is related to the quality of the finished battery.
In the production of 3C lithium batteries, each step directly affects the quality and safety of the battery. The performance tests of 3C lithium batteries include basic performance, safety performance, environmental performance and electrochemical performance. During the test, the shrapnel microneedle module can transmit current between 1-50A, with strong overcurrent capability and an average of 20W. Battery life can improve effiimprove the testing efficiency of 3C lithium batteries and ensure efficient and safe testing.
The proportion of negative electrode suspension
is divided into positive electrode mixture and negative electrode mixture
Positive electrode mixing: a) Pour the NMP into the mixer (100 L) at 80°C, weigh the PVDF and add it, turn on the machine; speed 25 ± 2 rpm, stir for 115-125 min; cooling system and grind the dry cathode material of No. 1 is added four times on average, with an interval of 28 to 32 minutes each time, depending on the material requirements for the third addition, and the NMP is added. after the fourth addition. Power mixer parameter adjustment: rotation speed is 20 ± 2 rpm; c) After the fourth addition of 30 ± 2 minutes, high-speed stirring is carried out, the time is 480 ± 10 minutes; : revolution is 30 ± 2 rpm, rotation is 25± 2 rpm; d) Vacuum mixing: mix power. Connect the machine to vacuum, keep the vacuum degree at -0.09 MPa and stir for 30 ± 2 min; of the power mixer are set: revolution is 10 ± 2 min, rotation is 8 ± 2 rpm. e) Take 250-300 ml of slurry and use a viscometer to measure the viscosity; test conditions: rotor number 5, rotation speed 12 or 30 rpm, temperature range 25°C. f) Remove the positive electrode material from the electric mixer; colloid crushing and sieving, and at the same time, put a mark on the stainless steel basin, and after handing over to the operator of the injection equipment, it can flow into the injection operation process . Negative electrode mixture: 1) Heat pure water to 80°C and pour into an electric mixer (2 L); 2) Add CMC and stir for 60 ± 2 minutes. Electric mixer parameters: revolution is 25 ± 2 minutes, rotation is 15 ± 2 r; /min; 3) Add SBR and deionized water, stir for 60 ± 2 min; electric mixer parameter settings: revolution is 30 ± 2 min, rotation is 20 ± 2 r/min 4) The anode dry materials are added in four equal orders; materials are added Add pure water at the same time, with an interval of 28-32 minutes each time; electric mixer parameter settings: revolution is 20 ± 2 r/min, rotation is 15 ± 2 r/min 5) High-speed stirring is carried out; after the fourth addition of 30±2r/min, the time is 480±10min power mixing;Machine parameters: revolution is 30±2rpm, rotation is 25±2rpm; 6) Vacuum mixing: connect the electric mixer to vacuum, keep the vacuum degree between -0.09 and 0.10 MPa, and stir for 30 ± 2 min. ; Parameters of electric mixing machine: revolution is 10±2 min, rotation is 8 ± 2 rpm 7) Take 500 ml of slurry and use a viscometer to measure the viscosity 8) Remove the material from the negative electrode of the electric mixer for grinding; and sieving, and at the same time labels are put on the stainless steel basins, and after being handed over to the injection equipment operator, they can be integrated into the injection operation process.
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Anode Slurry Ratio: Anode Material: 94.5%, Super-P: 1.0%, SBR: 2.25%, CMC: 2, 25%.
The main components of negative battery slurries include active materials, conductive agents, binders andadditives. The negative battery paste formula used in different types of batteries may vary.
The active material of the negative battery suspension is generally a carbon material, such as natural graphite or synthetic graphite. Active materials are responsible for storing and releasing charge, affecting the capacity and cycle performance of the battery. The function of the conductive agent is to increase the conductivity of the negative battery mud and improve the discharge efficiency of the battery. Commonly used conductive agents include carbon black and conductive polymers.
The function of the binder is to bind together the different components of the negative battery mud to form a solid structure. Commonly used binders include polyacrylic acid or polyvinyl acid.
There are many types of additives and their functions are also different.For example, some additives can improve battery life and prevent battery self-discharge; Some additives can improve the safety performance of the battery and prevent the battery from overheating or short circuiting.
Preparation of negative battery grout
The preparation process of negative battery grout generally includes steps such as mixing, dispersing, agitation and membrane filtration. First, the active material, conductive agent, binder and additives are mixed in a certain proportion.
Then, the mixed suspension is transformed into a uniform suspension through process steps such as dispersion and stirring; Finally, the suspension is passed through process steps such as filter membranes to remove solid particles and obtain a uniform electrode suspension.
The groutAnodic battery is widely used in various types of batteries, such as lithium-ion batteries, nickel-metal hydride batteries, lithium-sulfur batteries, etc. Different types of batteries have different requirements for negative battery mud, so it is necessary to select the appropriate formula according to the application scenarios and battery requirements.