阅读说明：本技术 电池钢壳的清洗方法及清洗装置 (Cleaning method and cleaning device for battery steel shell ) 是由 常海涛 黄钧 林建辉 徐志锋 刘利焌 张剑平 于 2021-07-06 设计创作，主要内容包括：本发明公开了一种电池钢壳的清洗方法及清洗装置,清洗方法包括如下步骤：抛光清洗步骤,将钢壳置于含有钢针的抛光清液中并对钢壳进行磁力抛光；分离钢壳步骤,将含有钢针和磁力抛光后的钢壳的抛光洗液过滤,得到磁力抛光后的钢壳；以及至少一次水洗步骤,将磁力抛光后的钢壳进行至少一次水洗。本发明提供的清洗方法,能够对电池钢壳的清洗更加彻底,无金属碎屑残留,清洗步骤简单,解决了现有的电池钢壳表面清洗流程繁琐、步骤冗余及外引入的金属碎屑问题。(The invention discloses a cleaning method and a cleaning device for a battery steel shell, wherein the cleaning method comprises the following steps: polishing and cleaning, namely placing the steel shell into polishing clear liquid containing the steel needle and performing magnetic polishing on the steel shell; a step of separating the steel shell, which is to filter polishing washing liquid containing the steel needle and the steel shell after magnetic polishing to obtain the steel shell after magnetic polishing; and at least one water washing step, namely performing at least one water washing on the steel shell after the magnetic polishing. The cleaning method provided by the invention can clean the battery steel shell more thoroughly without metal debris residue, has simple cleaning steps, and solves the problems of complicated cleaning process, redundant steps and externally introduced metal debris of the surface of the conventional battery steel shell.)

1. The cleaning method of the battery steel shell is characterized by comprising the following steps:

polishing and cleaning, namely placing the steel shell into polishing clear liquid containing a steel needle and performing magnetic polishing on the steel shell;

a step of separating the steel shell, which is to filter polishing washing liquid containing the steel needle and the steel shell after magnetic polishing to obtain the steel shell after magnetic polishing; and

and at least one water washing step, wherein the steel shell after magnetic polishing is subjected to at least one water washing.

2. The cleaning method of the steel battery case according to claim 1,

the at least one water washing step comprises an ultrasonic cleaning step, wherein the steel shell after magnetic polishing is placed in pure water and is subjected to ultrasonic cleaning; and/or

And the at least one water washing step comprises a water washing step, and the steel shell after magnetic polishing is washed by pure water.

3. The cleaning method of the steel battery case according to claim 2, wherein in the ultrasonic cleaning step, the total volume of the magnetically polished steel case accounts for 60-80% of the volume of the pure water.

4. The method for cleaning the steel battery case according to claim 1, wherein the total volume of the steel case accounts for 60-80% of the volume of the polishing washing liquid.

5. The cleaning method of the steel battery case according to claim 1,

the polishing washing liquid comprises strong alkali salt, nonionic surfactant, corrosion inhibitor and water, wherein the strong alkali salt comprises at least one of strong alkali weak acid salt and strong alkali strong acid salt; and/or

The PH value of the polishing washing liquid is more than 10, and the temperature of the polishing washing liquid is 45-50 ℃.

6. The cleaning method of the steel battery case according to claim 1,

the diameter of the steel needle is 0.3 mm-0.5 mm, and the length of the steel needle is 3 mm-5 mm; and/or

The frequency of the magnetic polishing is 20 Hz-60 Hz, and the time of the magnetic polishing is 30 min-40 min.

7. The cleaning method for the steel battery shell according to claim 1, further comprising the following steps:

a spin-drying step, in which the washed steel shell is spin-dried; and

and a drying step, drying the spin-dried steel shell.

8. The method for cleaning the steel shell of the battery as claimed in claim 1, wherein the steel shell is a steel shell of a button battery.

9. A cleaning device for a battery steel shell is characterized by comprising:

the magnetic polishing machine is used for carrying out magnetic polishing on the steel shell and comprises a steel needle;

the filtering device is used for separating a steel needle in polishing washing liquid from a steel shell after magnetic polishing, and the filtering device is positioned at the downstream of the magnetic polishing machine; and

at least one water washing equipment, water washing equipment is used for right the steel casing after the magnetic force polishing carries out washing at least once, water washing equipment is located filtration equipment's low reaches.

10. The cleaning device for the steel battery shell according to claim 9, wherein the water washing device comprises an ultrasonic machine for performing ultrasonic cleaning on the steel battery shell after the magnetic polishing.

11. The cleaning device for the steel battery shell according to claim 10, wherein the water washing device further comprises a water washing device for washing the steel shell after magnetic polishing by using pure water, and the water washing device is located at the downstream of the ultrasonic machine.

12. The cleaning device for the battery steel shell as recited in claim 9, wherein the diameter of the steel needle is 0.3mm to 0.5mm, and the length of the steel needle is 3mm to 5 mm.

13. The apparatus for cleaning the steel case for the battery as claimed in claim 9, further comprising a dryer for drying the washed steel case and a dryer located downstream of the dryer.

14. The apparatus for cleaning battery steel cases as claimed in claim 9, wherein the filtering device includes a screen and a vibrator for vibrating the screen.

Technical Field

The invention relates to the technical field of batteries, in particular to a cleaning method and a cleaning device for a battery steel shell.

Background

Batteries, such as button cells, typically have steel casings that are contaminated during the manufacturing process. The contaminants mainly include metal chips resulting from the punching of the steel strip and introduced drawing oil and the like. At present, the conventional cleaning method of the steel shell comprises multiple water-based cleaning, multiple flushing, multiple ultrasonic waves and the like, wherein hydrocarbon washing liquid is adopted in the cleaning process, and the principle is that oil stains are dissolved through the similarity and compatibility of a solution so as to achieve the purpose of cleaning. However, this cleaning method can remove oil stains, but is less effective in removing metal debris.

And the steel shell of the button cell is inconsistent and unstable in cleaning quality, so that the cleaning force is not complete enough, and the conditions of incomplete cleaning such as dust introduction and stain residue are easy to occur, so that the qualification rate of the steel shell produced by cell assembly is reduced, the subsequent production and manufacturing process of the cell is influenced, and even the cell performance is influenced.

Therefore, a method and an apparatus for cleaning a steel battery case are needed to at least partially solve the above problems.

Disclosure of Invention

In this summary, concepts in a simplified form are introduced that are further described in the detailed description. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

In order to at least partially solve the problems, the invention provides a cleaning method of a battery steel shell, which comprises the following steps:

polishing and cleaning, namely placing the steel shell into polishing clear liquid containing a steel needle and performing magnetic polishing on the steel shell;

a step of separating the steel shell, which is to filter polishing washing liquid containing the steel needle and the steel shell after magnetic polishing to obtain the steel shell after magnetic polishing; and

and at least one water washing step, wherein the steel shell after magnetic polishing is subjected to at least one water washing.

Optionally, the at least one water washing step includes an ultrasonic washing step of placing the magnetically polished steel shell in pure water and performing ultrasonic washing on the magnetically polished steel shell; and/or

And the at least one water washing step comprises a water washing step, and the steel shell after magnetic polishing is washed by pure water.

Optionally, in the ultrasonic cleaning step, the total volume of the steel shell after magnetic polishing accounts for 60% to 80% of the volume of the pure water.

Optionally, the total volume of the steel shell accounts for X% to Y% of the volume of the polishing wash solution.

Optionally, the polishing rinse comprises a strong base salt, a nonionic surfactant, a corrosion inhibitor, and water, wherein the strong base salt comprises at least one of a strong base weak acid salt and a strong base strong acid salt; and/or

The PH value of the polishing washing liquid is more than 14, and the temperature of the polishing washing liquid is 45-50 ℃.

Optionally, the diameter of the steel needle is 0.5mm, and the length of the steel needle is 5 mm; and/or

The frequency of the magnetic polishing is 20 Hz-60 Hz, and the time of the magnetic polishing is 30 min-40 min.

Optionally, the method further comprises:

a spin-drying step, in which the washed steel shell is spin-dried; and

and a drying step, drying the spin-dried steel shell.

Optionally, the steel casing is a steel casing of a button cell.

According to another aspect of the present invention, there is provided a cleaning apparatus for a battery steel can, comprising:

the magnetic polishing machine is used for carrying out magnetic polishing on the steel shell and comprises a steel needle;

a filtering device for separating the steel needle from the magnetically polished steel shell in the polishing wash, the filtering device being located downstream of the magnetic polisher and comprising a screen; and

at least one water washing equipment, water washing equipment is used for right the steel casing after the magnetic force polishing carries out washing at least once, water washing equipment is located filtration equipment's low reaches.

Optionally, the water washing device comprises an ultrasonic machine for performing ultrasonic cleaning on the steel shell after the magnetic polishing.

Optionally, the washing equipment still includes water washing equipment for it is right to use the pure water steel casing after the magnetic force polishing washes, water washing equipment is located the low reaches of ultrasonic wave machine.

Optionally, the diameter of the steel needle is 0.5mm, and the length of the steel needle is 5 mm.

Optionally, a drier and a dryer are also included for drying the washed steel shell, the dryer being located downstream of the drier.

Optionally, the filtering apparatus comprises a shaker for shaking the screen.

According to the cleaning method and the cleaning device for the battery steel shell, provided by the invention, metal scraps on the steel shell, which are generated by punching a steel belt, can be effectively and quickly separated from the steel shell by means of magnetic polishing, so that the effect of removing the metal scraps is good, and the efficiency is high; by means of physical separation, the steel shell after magnetic polishing can be separated from the steel needle so as to wash the steel shell after magnetic polishing; through the washing, can be with the tiny metal piece that adheres to on the box hat, for example iron fillings, the burr that drops etc to and other pollutants such as residual oil dirt, polishing lotion can effectively get rid of to can obtain the better box hat of quality.

The cleaning method provided by the invention can clean the battery steel shell more thoroughly without metal debris residue, has simple cleaning steps, and solves the problems of complicated cleaning process, redundant steps and externally introduced metal debris of the surface of the conventional battery steel shell.

Drawings

The following drawings of the invention are included to provide a further understanding of the invention. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.

In the drawings:

FIG. 1 is a schematic block diagram of a cleaning method of a battery steel can according to the present invention;

fig. 2 is a schematic block diagram of a cleaning apparatus for a battery steel can according to the present invention.

Description of reference numerals:

10 magnetic polisher

20 Filter device

31 ultrasonic machine

32 water flushing device

40 spin dryer

50 dryer

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring the invention.

In the following description, a detailed description will be given in order to thoroughly understand the present invention. It is apparent that the implementation of the embodiments of the invention is not limited to the specific details familiar to those skilled in the art. The following detailed description of the preferred embodiments of the invention, however, the invention is capable of other embodiments in addition to those detailed.

It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

Ordinal words such as "first" and "second" are referred to herein merely as labels, and do not have any other meaning, such as a particular order, etc. Also, for example, the term "first component" does not itself imply the presence of "second component", and the term "second component" does not itself imply the presence of "first component".

It is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", and the like are used herein for purposes of illustration only and are not limiting.

Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art.

The invention provides a cleaning method of a battery steel shell, which can remove pollutants such as oil stains of metal debris tensile oil on the steel shell, which are generated by punching a steel belt, on the surface of the battery steel shell. In particular, the cleaning method is more preferably suitable for the steel shell of the button cell.

As shown in fig. 1, the cleaning method includes the steps of:

a polishing and cleaning step S1, namely, placing the steel shell into polishing clear liquid containing the steel needle and performing magnetic polishing on the steel shell; in the step, the high-intensity magnetic field can guide the steel needle to impact the steel shell in the polishing clear liquid at high frequency, so that metal scraps, burrs, mantles and the like on the steel shell and the steel shell can be effectively separated.

A steel shell separation step S2, filtering the polishing washing liquid containing the steel needle and the steel shell after magnetic polishing to obtain the steel shell after magnetic polishing; in this step, the magnetically polished steel shell can be separated from the polishing rinse, with the steel needle still contained in the polishing rinse.

At least one water washing step, namely, washing the steel shell subjected to magnetic polishing at least one time; in the step, polishing lotion, oil stain and other pollutants attached to the steel shell after magnetic polishing can be removed.

By means of the magnetic polishing, metal scraps produced by punching the steel belt on the steel shell can be effectively and quickly separated from the steel shell, the effect of removing the metal scraps is good, and the efficiency is high; by means of physical separation, the steel shell after magnetic polishing can be separated from the steel needle so as to wash the steel shell after magnetic polishing; through the washing, can be with the tiny metal piece that adheres to on the box hat, for example iron fillings, the burr that drops etc to and other pollutants such as residual oil dirt, polishing lotion can effectively get rid of to can obtain the better box hat of quality.

The cleaning method provided by the invention can clean the battery steel shell more thoroughly without metal debris residue, has simple cleaning steps, and solves the problems of complicated cleaning process, redundant steps and externally introduced metal debris of the surface of the conventional battery steel shell.

The polishing cleaning step S1 includes preparing a polishing rinse. The polishing rinse contains a metal surface treatment and water. Specifically, the polishing rinse solution may contain a strong alkali salt, a nonionic surfactant, a corrosion inhibitor and water, wherein the strong alkali salt, the nonionic surfactant and the corrosion inhibitor belong to the metal surface treatment agents, and the strong alkali salt may include at least one of a strong alkali weak acid salt and a strong alkali strong acid salt. The strong base weak acid salt can be sodium carbonate or sodium bicarbonate. The polishing washing liquid can remove metal debris and pollutants such as oil stains of tensile oil in the polishing and cleaning process, and further improves the cleaning effect and the cleaning efficiency.

The polishing washing liquid comprises the following components in percentage by mass: 4-7 percent of water, 4-6 percent of nonionic surfactant, 2-5 percent of corrosion inhibitor and the balance of water. For example, the strong base salt may be present in an amount of 4%, 5%, 6%, 7%, etc., the nonionic surfactant may be present in an amount of 4%, 4.5%, 5%, 5.5%, 6%, etc., and the corrosion inhibitor may be present in an amount of 2%, 3%, 4%, 5%, etc.

The step of preparing the polishing slurry includes adding a predetermined content of each of the metal surface treating agents to water; adjusting the pH value of the polishing washing liquid to ensure that the pH value is more than 10; for example, the pH may be 11, 11.5, 12, 12.5, etc. The temperature of the polishing slurry can be controlled to 45 ℃ to 50 ℃, for example, 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃, 50 ℃ or the like; the preliminary operation is carried out for 5min to 8 min. Thereby, the metal surface treatment agent can be sufficiently dissolved in water. Wherein, the mass percentage of the corrosion inhibitor is smaller than that of the alkali salt and that of the nonionic surfactant. In other words, the polishing rinse contains a small amount of corrosion inhibitor. Thereby, corrosion of the steel shell by the polishing wash can be avoided.

The polish cleaning step S1 includes placing the steel shell in a polish wash. In this step, the steel needle is cylindrical in shape. The diameter of the steel needle may be 0.3mm to 0.5mm, for example the diameter of the steel needle may be 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, etc., the length of the steel needle may be 3mm to 5mm, for example the length of the steel needle may be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. The steel shell can be a steel shell of a button cell. The total volume of the steel shell may be 60% to 80% by volume of the polishing wash solution, for example 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, etc. .

The polishing cleaning step S1 includes performing magnetic polishing. In this step, the temperature of the polishing washing liquid may be maintained at 45 to 50 ℃, for example, at 45 ℃, 46 ℃, 47 ℃, 48 ℃, 49 ℃, 50 ℃ or the like. The frequency of the magnetic polishing can be 20Hz to 60Hz, for example, the frequency can be 20Hz, 25Hz, 30Hz, 35Hz, 40Hz, 45Hz, 50Hz, 55Hz, 60Hz, etc., and the time of the magnetic polishing can be 30min to 40min, for example, the time can be 30min, 32min, 34min, 36min, 38min, 40min, etc. Thereby, a better polishing effect can be achieved.

In the steel case separating step S2, the steel case is separated from the steel needle by means of the difference in size between the steel needle and the steel case.

Further, the at least one water washing step may include an ultrasonic cleaning step S31 and a water rinsing step S32.

In the ultrasonic cleaning step S31, the magnetic-polished steel can is placed in pure water and subjected to ultrasonic cleaning. The total volume of the steel shell after magnetic polishing may be 60% to 80% of the volume of the pure water, for example, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, etc. The current control of the ultrasonic wave is 1.5A to 2A, and for example, the current control may be 1.5A, 1.6A, 1.7A, 1.8A, 1.9A, or 2.0A.

In the water washing step S32, the steel shell after magnetic polishing is washed with pure water. The residual contaminants are effectively removed by the impact force of the pure water.

The washing method may further include a spin-drying step S4 and a drying step S5. In the spin-drying step S4, the washed steel shell is spin-dried, wherein the spin-drying frequency may be controlled to be 30Hz to 45Hz, for example, the frequency may be 30Hz, 32Hz, 36Hz, 38Hz, 40Hz, 42Hz, or 45 Hz; in the drying step S5, the dried steel shell is dried, wherein the drying temperature may be 130 ± 10 ℃, for example, the drying temperature may be 120 ℃, 125 ℃, 130 ℃, 135 ℃, 140 ℃, etc., and the drying time may be 40min to 60min, for example, the drying time may be 40min, 45min, 50min, 55min, 60min, etc. According to another aspect of the invention, the cleaning device for the battery steel shell is capable of removing pollutants such as greasy dirt of metal debris tensile oil on the steel shell generated by punching a steel strip on the surface of the battery steel shell. In particular, the cleaning device is more preferably suitable for the steel shell of the button cell.

As shown in fig. 2, the washing apparatus includes a magnetic polisher 10, a filtering device 20, and at least one water washing device. The filtering device 20 can be located downstream of the magnetic polisher 10 and the water washing device can be located downstream of the filtering device 20. The magnetic polishing machine 10 is used for carrying out magnetic polishing on the steel shell, the filtering device 20 is used for separating a steel needle in polishing washing liquid from the steel shell after the magnetic polishing, and the water washing device is used for carrying out at least one time of water washing on the steel shell after the magnetic polishing.

Specifically, the magnetic polisher 10 can include a steel needle and a cleaning chamber. The cleaning chamber can be used to receive a steel needle and a polishing rinse. As described above, the diameter of the steel needle may be 0.3mm to 0.5mm, and the length of the steel needle may be 3mm to 5 mm. The filtering apparatus 20 may include a screen and a vibrator for vibrating the screen. The mesh size on the screen is larger than or equal to the size of the steel needle and smaller than or equal to the size of the steel shell. Thus, the steel needles and the polishing lotion can be filtered out of the screen during the shaking of the screen, the steel shell being blocked above the screen. The mesh size may be, for example, 11mm or less. The meshes can be square holes, rectangular holes, circular holes and other holes with suitable shapes.

The water washing apparatus includes an ultrasonic machine 31 and a water rinsing apparatus 32. A water rinsing device 32 may be located downstream of the ultrasonic machine 31. The ultrasonic machine 31 is used for performing ultrasonic cleaning on the steel shell after magnetic polishing. The water rinsing device 32 is used to rinse the magnetically polished steel can using pure water. In the embodiment, the steel shell after magnetic polishing is firstly subjected to ultrasonic cleaning, and then water washing is carried out, so that the battery steel shell can be cleaned more thoroughly without metal debris residue.

The washing apparatus may further include a dryer 40 for drying the washed steel hull and a dryer 50, the dryer 50 being located downstream of the dryer 40. And after the washed steel shell is dried, the steel shell can be conveyed to a battery production line to manufacture batteries or stored for standby, and the dried steel shell is convenient for long-term storage.

It should be noted that, for the sake of brevity, reference may be made to the contents of the cleaning apparatus described above with reference to the cleaning method.

Test

Tests were conducted on an unwashed steel shell and a steel shell obtained using the cleaning method or the cleaning apparatus provided in the present embodiment, respectively, to verify the superiority of the cleaning method or the cleaning apparatus of the present embodiment.

For example, using a dyne pen test. The dyne pen test steps are as follows:

a dyne pen with an estimated dyne value is selected. The dyne pen is drawn in a substantially straight line perpendicular to the surface of the steel shell. For button cells, the dyne pen is drawn in a substantially straight line perpendicular to the top or bottom surface of the steel can. And observing whether the handwriting shrinks and is condensed into water drops within 5 seconds. If the particles are condensed into water drops, the dyne pen with the first-order dyne value is changed down to draw a straight line until the particles are not contracted and condensed into water drops; the dyne value of the dyne pen when not condensed into water beads is the dyne value of the surface of the steel shell.

It can be understood that the larger the dyne value is, the larger the surface tension and surface humidity of the steel shell surface are, and the higher the cleanliness of the steel shell surface is.

The dyne value of the dyne pen is smaller and is lower than 22 for the uncleaned steel shell; the dyne value of the dyne pen of the steel shell obtained by using the cleaning method or the cleaning device provided by the embodiment can reach more than 34, which is obviously higher than that of the steel shell which is not cleaned.

Therefore, the cleaning method or the cleaning apparatus according to the present embodiment can effectively improve the surface cleanliness of the steel shell.

The cleaning method of the battery steel shell provided by the invention comprises the following steps: polishing and cleaning, namely placing the steel shell into polishing clear liquid containing the steel needle and performing magnetic polishing on the steel shell; a step of separating the steel shell, which is to filter polishing washing liquid containing the steel needle and the steel shell after magnetic polishing to obtain the steel shell after magnetic polishing; and at least one water washing step, namely performing at least one water washing on the steel shell after the magnetic polishing. The cleaning method can clean the battery steel shell more thoroughly, has no metal debris residue, has simple cleaning steps, and solves the problems of complicated surface cleaning process, redundant steps and externally introduced metal debris of the conventional battery steel shell.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is otherwise inapplicable or otherwise stated in the other embodiment.

The present invention has been illustrated by the above embodiments, but it should be understood that the above embodiments are for illustrative and descriptive purposes only and are not intended to limit the invention to the scope of the described embodiments. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which variations and modifications are within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.