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Manufacturing method of power cell electrode slurry for electric automobile
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A power battery and electrode slurry technology, which is applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problem that the dispersion of electrode materials, conductive agents, and binders cannot be controlled by effective measures, and the consistency of battery pole pieces cannot be obtained. Effectively control or solve problems to achieve the effect of ensuring consistency
Active Publication Date: 2013-11-20
奇瑞新能源汽车股份有限公司
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[0007] Since the above method can only control the consistency of the battery pole piece from the macroscopic aspect, and microscopically, such as the dispersion of the electrode material, the conductive agent, and the binder, effective measures cannot be taken to control the microcosmic consistency of the battery pole piece. However, the microscopic consistency of the electrodes is precisely the most important factor that directly affects the consistency of the battery.
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Embodiment 1
[0050] The preparation method of the power battery electrode slurry for electric vehicles adopts the method of adding raw materials in batches and stirring, controls the temperature and viscosity of the slurry mixed in each batch, and then ensures the consistency of the battery pole piece from the microcosm; adopts Planetary mixer, and vacuumize to -0.1mPa before each use of the mixer, and then use the planetary mixing bucket to stir, including two steps:
[0051] Step 1, the preparation of positive electrode slurry, the positive electrode slurry is prepared by mixing N-methylpyrrolidone solvent, polyvinylidene fluoride, conductive agent and lithium iron phosphate positive electrode material, wherein polyvinylidene fluoride, conductive agent and iron phosphate Lithium cathode material (LFP) accounts for 55% of the total weight, and the weight ratio of vinylidene fluoride, conductive agent and LFP is 3%: 2%: 95%;
[0052] Specifically include the following procedures;
[0053]...
Embodiment 2
[0081] The preparation method of the power battery electrode slurry for electric vehicles adopts the method of adding raw materials in batches and stirring, controls the temperature and viscosity of the slurry mixed in each batch, and then ensures the consistency of the battery pole piece from the microcosm; adopts Planetary mixer, and vacuumize to -0.1mPa before each use of the mixer, and then use the planetary mixing bucket to stir, including two steps:
[0082] Step 1, the preparation of positive electrode slurry, the positive electrode slurry is prepared by mixing N-methylpyrrolidone solvent, polyvinylidene fluoride, conductive agent and lithium iron phosphate positive electrode material, wherein polyvinylidene fluoride, conductive agent and iron phosphate Lithium cathode material (LFP) accounts for 50% of the total weight, and the weight ratio of vinylidene fluoride, conductive agent and LFP is 3.5%: 2.5%: 94%;
[0083] Specifically include the following procedures;
[0...
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Abstract
The invention discloses a manufacturing method of a power cell electrode slurry for an electric automobile. The method comprises manufacturing steps of a cell anode slurry and manufacturing steps of a cell cathode slurry. The invention employs a batch by batch way to put and stir raw materials; during the whole slurry manufacturing process, temperature and flow velocity of circulating water, stirring time, temperature and viscosity of slurry are controlled to keep the whole slurry system in a near constant temperature state; and solvent and powder are added with stirring by batch. On one hand, the control is in favor of uniform mixing of the slurry in order to guarantee viscosity homogeneity of the slurry during a feeding process; on the other hand, powder of different batches are dispersed into the slurry in a near same environment to realize slurry uniformity in one batch and among batches, so as to guarantee consistency of the power lithium ion battery electrode microscopically. Therefore, performances of the power cell for electric automobile are improved.
Description
technical field [0001] The invention relates to the field of automobile power batteries, in particular to a method for preparing electrode slurry for power batteries for electric vehicles. Background technique [0002] Electric vehicles have the characteristics of low carbon and environmental protection, and are the future development direction of automobiles. With the development of electric vehicle technology, automobile manufacturers have increasingly urgent requirements for the performance improvement of lithium-ion power batteries used in electric vehicles. The consistency of lithium-ion power batteries used in electric vehicles is the biggest bottleneck restricting the development of the entire electric vehicle technology. [0003] At present, the methods to solve the consistency of single battery mainly focus on the following methods: [0004] One is to use a high-precision coating machine to improve the consistency of the amount of coating in the horizontal and vert...
Claims
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