阅读说明：本技术 一种防止锂电池钢壳表面生锈的钝化剂及其使用方法 (Passivator for preventing surface of steel shell of lithium battery from rusting and application method thereof ) 是由 周伟 李文康 陈大圣 宗哲 于 2020-07-07 设计创作，主要内容包括：本发明公开了一种防止锂电池钢壳表面生锈的钝化剂,按照质量百分比包括以下成分：3～7％硝酸、1～3％重铬酸钾、90～96％水；一种防止锂电池钢壳表面生锈的钝化剂的使用方法,包括以下步骤：S1、将电池钢壳用清水冲洗干净,冲去电池钢壳表面的残留电解液；S2、将清洗后的电池钢壳浸入钝化稀释液中60～90秒后取出；S3、用大量清水冲洗电池钢壳90～150秒,再用长流水浸洗90～150秒；S4、将电池钢壳浸入酒精中25～35秒后取出；S5、将电池钢壳放置于干净干布上,用排风扇吹干。本发明的优点在于：防锈效果好、方便配制使用、不影响电池性能、有效延长电池存储时间、降低电池存储成本。(The invention discloses a passivator for preventing a steel shell surface of a lithium battery from rusting, which comprises the following components in percentage by mass: 3-7% of nitric acid, 1-3% of potassium dichromate and 90-96% of water; a use method of a passivator for preventing the surface of a steel shell of a lithium battery from rusting comprises the following steps: s1, washing the battery steel shell clean with clear water, and washing away residual electrolyte on the surface of the battery steel shell; s2, immersing the cleaned steel battery shell into a passivation diluent for 60-90 seconds, and taking out; s3, washing the steel shell of the battery for 90-150 seconds by using a large amount of clear water, and then soaking and washing for 90-150 seconds by using long-flowing water; s4, immersing the steel battery shell into alcohol for 25-35 seconds, and taking out; and S5, placing the battery steel shell on clean dry cloth, and drying by using an exhaust fan. The invention has the advantages that: the antirust effect is good, the preparation and the use are convenient, the battery performance is not influenced, the storage time of the battery is effectively prolonged, and the storage cost of the battery is reduced.)

1. The passivator for preventing the surface of a steel shell of a lithium battery from rusting is characterized by comprising the following components in percentage by mass: 3-7% of nitric acid, 1-3% of potassium dichromate and 90-96% of water.

2. The passivator for preventing the steel shell surface of a lithium battery from rusting as claimed in claim 1, which comprises the following components in percentage by mass: 4-6% of nitric acid, 1-3% of potassium dichromate and 91-95% of water.

3. The passivator for preventing the steel shell surface of a lithium battery from rusting as claimed in claim 1, which comprises the following components in percentage by mass: 5% nitric acid, 2% potassium dichromate and 93% water.

4. A use method of a passivator for preventing a lithium battery steel shell surface from rusting is characterized by comprising the following steps:

s1, washing the battery steel shell clean with clear water, and washing away residual electrolyte on the surface of the battery steel shell;

s2, immersing the cleaned steel battery shell into a passivation diluent for 60-90 seconds, and taking out;

s3, washing the steel shell of the battery for 90-150 seconds by using a large amount of clear water, and then soaking and washing for 90-150 seconds by using long-flowing water;

s4, immersing the steel battery shell into alcohol for 25-35 seconds, and taking out;

and S5, placing the battery steel shell on clean dry cloth, and drying by using an exhaust fan.

5. The use method of the passivator for preventing the steel shell surface of the lithium battery from rusting as claimed in claim 1, wherein the passivator comprises the following steps: and the time for soaking the steel battery shell in the passivation diluent in the S2 is 70 seconds.

6. The use method of the passivator for preventing the steel shell surface of the lithium battery from rusting as claimed in claim 1, wherein the passivator comprises the following steps: and in the S3, the time for washing the steel battery shell by clear water is 120 seconds, and the time for pickling the steel battery shell by running water is 120 seconds.

7. The use method of the passivator for preventing the steel shell surface of the lithium battery from rusting as claimed in claim 1, wherein the passivator comprises the following steps: the time for immersing the steel battery shell into the alcohol in the S4 is 30 seconds.

Technical Field

The invention relates to the technical field of lithium batteries, in particular to a passivator for preventing a steel shell surface of a lithium battery from rusting and a using method thereof.

Background

With the development of scientific technology advancing day by day, the battery is more and more widely applied in various fields such as mobile communication, electric vehicles, energy storage and the like, and almost all the fields of production, life and scientific research are included. In recent years, new energy automobiles at home and abroad are rapidly developed, the demand for batteries is increased, and the performance requirements for the batteries are increased, including the capacity retention rate of the batteries, the cycle rate of the batteries, the appearance of the batteries and the like. The influence of the rusty spot on the appearance of the battery steel shell is also a great test, and the appearance of the battery directly influences the sale of the battery.

At present, the method for preventing corrosion of the steel shell mainly comprises the step of coating a layer of anti-rust oil on the surface of the steel shell after sealing, but the treatment method has poor anti-rust effect, short service life and low production efficiency, and if the anti-rust oil is coated more, the PET film shrinks and deforms seriously to cause rework, and the phenomena of insufficient soldering, false soldering and unsoldered soldering can occur during the pack soldering of the battery.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a passivator for preventing the surface of a steel shell of a lithium battery from rusting, which has a good antirust effect, is convenient to prepare and use, does not influence the performance of the battery, effectively prolongs the storage time of the battery and reduces the storage cost of the battery.

In order to solve the technical problems, the technical scheme provided by the invention is as follows: a passivator for preventing a lithium battery steel shell surface from rusting comprises the following components in percentage by mass: 3-7% of nitric acid, 1-3% of potassium dichromate and 90-96% of water.

Preferably, the paint comprises the following components in percentage by mass: 4-6% of nitric acid, 1-3% of potassium dichromate and 91-95% of water.

Preferably, the paint comprises the following components in percentage by mass: 5% nitric acid, 2% potassium dichromate and 93% water.

A use method of a passivator for preventing the surface of a steel shell of a lithium battery from rusting comprises the following steps:

s1, washing the battery steel shell clean with clear water, and washing away residual electrolyte on the surface of the battery steel shell;

s2, immersing the cleaned steel battery shell into a passivation diluent for 60-90 seconds, and taking out;

s3, washing the steel shell of the battery for 90-150 seconds by using a large amount of clear water, and then soaking and washing for 90-150 seconds by using long-flowing water;

s4, immersing the steel battery shell into alcohol for 25-35 seconds, and taking out;

and S5, placing the battery steel shell on clean dry cloth, and drying by using an exhaust fan.

Preferably, the soaking time of the steel battery case in the S2 in the passivation diluent is 70 seconds.

Preferably, the time for rinsing the steel battery shell with clean water in S3 is 120 seconds, and the time for rinsing the steel battery shell with running water is 120 seconds.

Preferably, the time for immersing the steel battery case in the alcohol in the S4 is 30 seconds.

Compared with the prior art, the invention has the advantages that: the passivating agent comprises nitric acid, potassium dichromate and water, is few in components and easy to prepare, and is mainly subjected to cleaning of the battery steel shell, soaking in a passivating solution, secondary cleaning, alcohol soaking and drying when the passivating agent is used for treating the battery steel shell.

Detailed Description