It is divided into positive electrode mixture and negative electrode mixture
Positive electrode mixture: a) Pour the NMP into the electric mixer (100 L ) at 80°C and weigh. the PVDF Add it and turn on the machine; parameters: rotation speed 25 ± 2 r/min, stirring 115-125 min. b) Turn on the cooling system, add the dry material of the crushed positive electrode into four equal parts, with an interval of 28-32 min each time, and the third add NMP according to the material requirements for the first feeding , and add NMP after the fourth feeding; electric mixer parameter setting: rotation speed is 20 ± 2 r/min c) high speed stirring is; carried out after the fourth feeding for 30 ± 2 min, and the time is 480 ± 10 min; Electric mixer parameters: revolution is 30 ± 2 rpm, rotation is 25 ± 2 rpm d) vacuum mixing: coConnect the electric mixer to the vacuum; , keep the vacuum degree at -0.09 MPa and stir for 30 ± 2 min; electric mixer parameter settings: revolution is 10 ± 2 min, rotation is 8 ± 2 r/min. 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) Ajoute 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; electric mixer parameter settings: revolution is 30±2r/min, rotation is 25±2r/min 6) Vacuum mixing: connect the electric mixer to vacuum; and keep the vacuum degree between -0.09 and 0.10 MPa, stir for 30 ± 2 min; electric mixer parameter settings: revolution is 10 ± 2 min, rotation is 8 ± 2 rpm 7) Take 500 ml of boue and use a viscometer to measure the viscosity; ; 8) Remove the negative electrode material from the electric mixer. Take it out for grinding and screening, and mark the stainless steel basin. After handing over the pulping equipment to the operator, he can enter the pulping operation process.
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Lithium iron phosphate battery safetyAll?
The production of lithium-ion batteries requires special attention:
1. The ratio between the positive and negative electrode materials of lithium-ion batteries should be reasonable.
2. Choose the appropriate electrolyte. The electrolyte has asignificant impact on the lifespan of lithium-ion batteries.
3. Set reasonable usage conditions and ranges, such as charging and discharging rates, operating temperature range, storage temperature range, charging and discharging cut-off voltage, etc., to prevent the battery from exceeding its usage. limit.
Fourth, strengthen battery safety protection, establish battery safety valves, use heat-sealing diaphragms, charge special protection circuits, activate special battery management systems, etc. , to improve the safety of battery use and improve the battery cycle life.
5. After the production of 3C lithium batteries is completed, performance testing is required to verify whether the battery quality is qualified. The application of spring microneedle modules toHigh current can achieve good conduction and help improve testing efficiency. .
How to segment the lithium battery production process
Lithium iron phosphate is currently the safest cathode material for lithium-ion batteries. It does not contain any heavy metal elements harmful to the environment. human body. Its olivine structure The oxygen it contains is difficult to precipitate, which improves the stability of the material. The production process of lithium iron phosphate batteries is basically the same as that of other varieties of lithium batteries. The basic processes are batching, coating, rolling, coating and winding. As part of the material, the conductivity of lithium iron phosphate material is relatively low, and the particles are generally smaller. This objective effect is as follows: the internal arrangement is more uniform, which incite to form a balanced voltage platform and the battery can be. kept stable during operation. Charging and discharging are the two fundamental operating states of lithium batteries. After the lithium iron phosphate battery is charged and discharged, because the oxidizing capacity of iron ions is not strong and does not release oxygen, the redox reaction with the electrolyte naturally becomes difficult, making the process charging and discharging of lithium iron phosphate battery. in a safe environment.
The manufacturing process of 3C lithium batteries is divided into four procedures: one is pole piece production, the other is cell assembly, the third is cell detection. cell activation and the fourth is battery packaging. Cell activation includes battery formation, capacity division and testing. This is a key process aftermanufacturing of 3C lithium battery and before packing and shipping. 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 micro-needle module can transmit the current between 1-50A when testing mobile phone lithium battery, and has good connection function and it has reliable response method in the domain 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.