阅读说明：本技术 动力锂离子电池油性陶瓷浆料合浆工艺 (Slurry mixing process for oily ceramic slurry of power lithium ion battery ) 是由 唐林祥 汤元波 于 2018-07-19 设计创作，主要内容包括：一种动力锂离子电池油性陶瓷浆料合浆工艺,用于锂离子电池制造。本发明工艺包括以下步骤：(1)按要求称取9-15%的粘接剂和80%-95%的溶剂加入到搅拌罐中并进行搅拌均匀；(2)按要求称取85-91%的陶瓷粉加入到搅拌好的胶液中并进行搅拌；(3)取剩下的5%-20%溶剂调节陶瓷浆料粘度,即得到搅拌好的陶瓷浆料；所述陶瓷浆料总固体物质的各成分质量百分比为：粘接剂12%,陶瓷粉88%,溶剂量占总固体物质质量百分比为33%～33.5%。本发明采用陶瓷浆料涂敷在动力锂电池内部极片边缘,能提高动力锂电池绝缘防止短路性能,为动力锂电池在应用过程中提供了更安全的保证。(slurry mixing process of oil ceramic slurry of power lithium battery, which is used for manufacturing the lithium battery, the process of the invention comprises the following steps of (1) weighing 9-15% of adhesive and 80-95% of solvent according to requirements, adding the adhesive and the solvent into a stirring tank, uniformly stirring the mixture, (2) weighing 85-91% of ceramic powder according to requirements, adding the ceramic powder into the stirred glue solution, stirring the mixture, and (3) adjusting the viscosity of the ceramic slurry by the remaining 5-20% of solvent to obtain the stirred ceramic slurry, wherein the total solid matters of the ceramic slurry comprise, by mass, 12% of the adhesive, 88% of the ceramic powder and 33-33.5% of the solvent in the total solid matters.)

1, kinds of power lithium ion battery oil ceramic slurry mixing process, which is characterized in that the process steps are as follows:

(1) weighing 9-15% of adhesive and 80-95% of solvent according to the requirement, adding into a stirring tank, and stirring at low speed for 15min by revolving at 15-20 rpm, rotating at 300-600 rpm, keeping the temperature at 30 +/-5 ℃;

(2) performing high-speed stirring for 120-180 min at revolution speed of 30-35 rpm, rotation speed of 1200-1400 rpm, vacuum degree of-0.85 MPa and temperature of 30 +/-5 ℃;

(3) weighing 85-91% of ceramic powder according to requirements, adding the ceramic powder into the stirred glue solution, and stirring at a low speed for 15min by revolving at 15-20 rpm and rotating at 300-600 rpm, keeping the temperature at 30 +/-5 ℃;

(4) performing high-speed stirring for 120-180 min at revolution speed of 30-35 rpm, rotation speed of 1200-1400 rpm, vacuum degree of-0.85 MPa and temperature of 30 +/-5 ℃;

(5) then adding the remaining 5-20% of solvent, and stirring at high speed for 30-60min by revolution at 30-35 rpm, rotation at 1200-1400 rpm, vacuum degree maintenance at-0.85 MPa, and temperature maintenance at 30 +/-5 ℃;

(6) after stirring, filtering by adopting a filter screen of 150 or 200 meshes to obtain slurry;

the ceramic slurry comprises the following total solid substances in percentage by mass: 12 percent of adhesive, 88 percent of ceramic powder and 33 to 33.5 percent of solvent accounting for the total solid matter by mass percent.

2. The power lithium ion battery oily ceramic slurry mixing process according to claim 1, characterized in that: the adhesive is polyvinylidene fluoride.

3. The power lithium ion battery oily ceramic slurry mixing process according to claim 1, characterized in that: the solvent is N-methyl pyrrolidone.

4. The power lithium ion battery oily ceramic slurry mixing process according to claim 1, characterized in that: the ceramic powder is alumina.

Technical Field

The invention relates to the technical field of lithium ion batteries, in particular to a slurry mixing process for kinds of power lithium battery oily ceramic slurry.

Background

With the development of industrial technology, the energy consumption is rapidly increased, the pollution is more and more serious, people begin to pay attention to the harm of pollutants in the air to health, and the words of 'new energy automobiles', 'green traffic' and the like become the focus of public attention, and because the power lithium battery has the advantages of no toxicity, no pollution, long service life and the like, the power lithium battery becomes an ideal power system of a new -generation new energy automobile.

At present, the safety performance of the power lithium battery is the most concerned in all new energy industries, and in order to improve the safety performance of the power lithium battery, ceramic slurry is coated on the edge of a pole piece inside the power lithium battery, so that safer guarantee is provided for the power lithium battery in the application process.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide an slurry mixing process for the oily ceramic slurry of the power lithium ion battery, and the ceramic slurry is coated on the edge of a pole piece so as to improve the safety performance of the power lithium battery in the application process.

In order to achieve the purpose, the invention prepares oily ceramic slurry through a slurry mixing process, which is used for coating the edge of a pole piece with a power lithium battery in the manufacturing process, and comprises the following steps:

(1) weighing 9-15% of adhesive and 80-95% of solvent according to the requirement, adding into a stirring tank, and stirring at low speed for 15min by revolving at 15-20 rpm, rotating at 300-600 rpm, keeping the temperature at 30 +/-5 ℃;

(2) performing high-speed stirring for 120-180 min at revolution speed of 30-35 rpm, rotation speed of 1200-1400 rpm, vacuum degree of-0.85 MPa and temperature of 30 +/-5 ℃;

(3) weighing 85-91% of ceramic powder according to requirements, adding the ceramic powder into the stirred glue solution, and stirring at a low speed for 15min by revolving at 15-20 rpm and rotating at 300-600 rpm, keeping the temperature at 30 +/-5 ℃;

(4) performing high-speed stirring for 120-180 min at revolution speed of 30-35 rpm, rotation speed of 1200-1400 rpm, vacuum degree of-0.85 MPa and temperature of 30 +/-5 ℃;

(5) then adding the remaining 5-20% of solvent, and stirring at high speed for 30-60min by revolution at 30-35 rpm, rotation at 1200-1400 rpm, vacuum degree maintenance at-0.85 MPa, and temperature maintenance at 30 +/-5 ℃;

(6) after stirring, filtering with a 150 or 200-mesh filter screen to obtain the slurry.

The ceramic slurry comprises the following total solid substances in percentage by mass: 12 percent of adhesive, 88 percent of ceramic powder and 33 to 33.5 percent of solvent accounting for the total solid matter by mass percent.

The adhesive is polyvinylidene fluoride.

The solvent is N-methyl pyrrolidone.

The ceramic powder is alumina.

Compared with the prior art, the ceramic slurry is coated on the edges of the pole pieces in the power lithium battery, so that micro short circuit is prevented when the power lithium battery is charged and discharged, and a heat transfer path between the pole pieces of the battery in a thermal runaway state can be properly blocked, thereby preventing thermal runaway diffusion, improving the safety performance of the power lithium battery, and providing safer guarantee for the power lithium battery in the application process of a new energy automobile.

Detailed Description