KR20200016001A - Array for producing electrode plate of secondary battery and method for producing electrode plate of secondary battery - Google Patents

Abstract

An embodiment of the present invention relates to an array for manufacturing an electrode plate of a secondary battery, and a method for manufacturing an electrode plate of a secondary battery. Specifically, provided is an array for manufacturing an electrode plate of a secondary battery capable of improving the productivity and quality of the electrode plate, and a method for manufacturing an electrode plate of a secondary battery. To this end, the array for manufacturing an electrode plate of a secondary battery according to an embodiment of the present invention includes an electrode current collector and an electrode active material applied to a portion of the electrode current collector. An uncoated portion to which the electrode active material is not applied on the electrode current collector is provided in plural to be spaced two-dimensionally from each other on the electrode current collector.

Description

Array for manufacturing electrode plate of secondary battery and manufacturing method of electrode plate of secondary battery {ARRAY FOR PRODUCING ELECTRODE PLATE OF SECONDARY BATTERY AND METHOD FOR PRODUCING ELECTRODE PLATE OF SECONDARY BATTERY}

Embodiment of this invention relates to the array for electrode plate manufacture of a secondary battery, and the electrode plate manufacturing method of a secondary battery.

Lithium ion secondary batteries have high operating voltage and high energy density per unit weight, and thus are widely used as power sources for hybrid and electric vehicles as well as various portable electronic devices.

The lithium ion secondary battery includes an electrode assembly having a negative electrode plate, a positive electrode plate, and a separator, a case accommodating the electrode assembly, a negative electrode tab drawn out from the negative plate, and a positive electrode tab drawn out from the positive plate. Here, the negative electrode plate and the positive electrode plate, that is, the electrode plate may be collectively formed by applying an electrode active material to a part of the electrode current collector, and the electrode tab may be provided on a non-coated portion where the electrode active material is not coated.

The above-described information disclosed in the background technology of the present invention is only for improving the understanding of the background of the present invention, and thus may include information that does not constitute the prior art.

Embodiments of the present invention provide an electrode plate manufacturing array of a secondary battery and an electrode plate manufacturing method of a secondary battery capable of improving the productivity and quality of the electrode plate.

The array for manufacturing an electrode plate of a secondary battery according to an exemplary embodiment of the present invention includes an electrode current collector and an electrode active material applied to a part of the electrode current collector, and the uncoated portion of the electrode current collector to which the electrode active material is not coated is provided in plurality. It may be provided two-dimensionally spaced apart from each other on the electrode current collector.

The non-coating portion may further include a series of first uncoated portions arranged at a specific interval along a virtual first line on the electrode current collector and at a specific interval along a virtual second line spaced apart from the first line on the electrode current collector. A series of second uncoated parts and a series of third uncoated parts arranged at specific intervals along a virtual third line spaced apart from the second line on the electrode current collector may be included.

In addition, the second line may be parallel to the first line, and the second uncoated part may be arranged in a form in which the first uncoated part is moved in parallel in a direction of the first line by a specific offset.

The first plain portions are arranged at regular intervals, the second line is parallel to the first line, and the second plain portion is one of the intervals between the first plain portions in the direction of the first line. It may be arranged in a form moved in parallel by a distance corresponding to / 2.

In addition, the second line may be parallel to the first line, and the third plain portion may be arranged in a symmetrical form with the first plain portion relative to the second line.

Meanwhile, in the method of manufacturing an electrode plate of a secondary battery according to an exemplary embodiment of the present invention, an electrode active material is applied to a part of an electrode current collector, and a plurality of non-coated parts of the electrode current collector not coated with the electrode active material are provided on the electrode current collector. It may include a step of coating so as to be spaced two-dimensionally spaced apart from each other and a step B for punching the electrode current collector into a predetermined shape of the electrode plate.

The step A may include attaching a mask to a region corresponding to the uncoated portion of the electrode current collector, applying the electrode active material to the electrode current collector with the mask, and drying the electrode active material. It may include a process for removing the mask from the current collector.

In the electrode plate manufacturing array of the secondary battery and the electrode plate manufacturing method of the secondary battery according to an embodiment of the present invention is provided with a plurality of non-coating portion of the electrode current collector is not coated with the electrode active material, two-dimensionally spaced apart from each other on the electrode current collector It is spread throughout. Therefore, when the electrode active material is dried, the effect due to the difference in strain between the region where the electrode active material is applied and the uncoated portion of the electrode current collector is not evenly concentrated at a specific site, thereby preventing the phenomenon in which the electrode plate manufacturing array is deformed. The productivity and quality of the final electrode plate can be improved.

In addition, the electrode plate manufacturing array can be geometrically appropriately modified / combined into electrode plates of various shapes as desired, and can be punched more space efficiently, thereby minimizing unnecessary loss of the electrode plate manufacturing array.

1 is a flowchart of a method of manufacturing an electrode plate of a secondary battery according to an embodiment of the present invention.
2 is a plan view of an array for manufacturing an electrode plate of a secondary battery according to an embodiment of the present invention.
3 and 4 are plan views showing punching lines on an electrode plate manufacturing array of a secondary battery according to an exemplary embodiment of the present invention, and show punching lines having different shapes, respectively.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more fully explain the present invention to those skilled in the art, and the following examples can be modified in many different forms, and the scope of the present invention is as follows. It is not limited to an Example. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In addition, in the following drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, the same reference numerals in the drawings refer to the same elements. As used herein, the term "and / or" includes any and all combinations of one or more of the listed items. In addition, the term "connected" in this specification means not only the case where the A member and the B member are directly connected, but also the case where the A member and the B member are indirectly connected by interposing the C member between the A member and the B member. do.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. Also, as used herein, "comprise, include" and / or "comprising, including" means that the features, numbers, steps, operations, members, elements, and / or groups thereof mentioned. It is intended to specify the existence and not to exclude the presence or addition of one or more other shapes, numbers, operations, members, elements and / or groups.

Although the terms first, second, etc. are used herein to describe various members, parts, regions, layers, and / or parts, these members, parts, regions, layers, and / or parts are defined by these terms. It is self-evident that. These terms are only used to distinguish one member, part, region, layer or portion from another region, layer or portion. Accordingly, the first member, part, region, layer or portion, which will be described below, may refer to the second member, component, region, layer or portion without departing from the teachings of the present invention.

Terms relating to spaces such as "beneath", "below", "lower", "above", and "upper" are associated with one element or feature shown in the figures. It can be used for easy understanding of other elements or features. Terms related to this space are for easy understanding of the present invention according to various process conditions or use conditions of the present invention, and are not intended to limit the present invention. For example, if an element or feature in the figures is inverted, the element or feature described as "bottom" or "bottom" will be "top" or "top". Thus, "bottom" is a concept encompassing "top" or "bottom".

1 is a flowchart of a method of manufacturing an electrode plate of a secondary battery according to an embodiment of the present invention.

Referring to FIG. 1, an electrode plate manufacturing method of a rechargeable battery according to an exemplary embodiment of the present invention includes an active material coating step S10 and an electrode plate punching step S20.

Active material application step (S10) is a step of applying the electrode active material to a portion of the electrode current collector.

If the electrode plate is to be used as a negative electrode plate, the electrode current collector may be made of, for example, copper or nickel foil, and the electrode active material may be made of, for example, graphite or carbon. Or if the electrode plate is to be used as a positive electrode plate, the electrode current collector may be made of, for example, aluminum foil, and the electrode active material may be made of, for example, a transition metal oxide. Of course, it can also be made of other materials as needed.

In this case, a plurality of areas of the electrode current collector 110 to which the electrode active material 120 is not applied, that is, the uncoated parts 130 (131; 132; 133) are provided in plurality, and as illustrated in FIG. 2, the electrode current collector 110 is disposed on the electrode current collector 110. Two-dimensionally spaced apart from each other, it is spread throughout.

In more detail, the uncoated portion 130 is a series of first uncoated portions 131 and the electrode current collector 110 arranged on the electrode current collector 110 and spaced apart from each other along a virtual first line L1 at a specific interval. A series of second uncoated portions 132 and a second line L2 disposed on the electrode current collector 110 arranged to be spaced apart from each other along a virtual second line L2 spaced apart from the first line L1 at a predetermined interval. The third uncoated portion 133 and the like may be arranged along the virtual third line L3 spaced apart from each other at a specific interval. Furthermore, a further series of uncoated parts are arranged along the other lines and spaced apart from each other at specific intervals. Since it will be readily understood that the repetition of 133 is repeated, the following description will be made with reference to the first uncoated portion 131, the second uncoated portion 132, and the third uncoated portion 133.

First, the first plain portions 131 may be arranged to be spaced apart from each other at regular intervals along the first line L1. The first line L1 is shown here as a straight line, but is not necessarily limited to the straight line. The same applies to the second line L2 and the third line L3. However, the first line L1, the second line L2, and the third line L3 will be described below for convenience of understanding.

The second uncoated portion 132 may also be spaced apart from each other at regular intervals along the second line L2. The second line L2 may be parallel to the first line L1. In addition, the second uncoated portion 132 may be arranged in such a manner that the first uncoated portion 131 is moved in parallel in a direction parallel to the first line L1 by a specific offset. For example, it may be arranged in a form of parallel movement by a distance corresponding to one half of the interval of the first plain portion 131.

The third plain portions 133 are also spaced apart from each other at regular intervals along the third line L3. The third line L3 may be parallel to the first line L1 and the second line L2, respectively. In addition, the third uncoated portion 133 may be arranged in a form in which the second uncoated portion 132 is moved in parallel in a direction parallel to the second line L2 by a specific offset. As described above, the second plain portions 132 are arranged in parallel to each other by a distance corresponding to 1/2 of the distance between the first plain portions 131, and the third plain portions 133 are also arranged in a second manner. When arranged in the form of parallel movement by a distance corresponding to one half of the distance between the plain portions 132, the third plain portions 133 are eventually connected to the first plain portions 131 based on the second line L2. It will be arranged in a symmetrical form.

As described above, the series of first uncoated parts 131 are arranged to be spaced apart from each other along the first line L1 at regular intervals, and the second uncoated part 132 and the third uncoated parts 133 are arranged in the first uncoated part ( 131 is spaced apart from each other in a direction crossing the first line L1. When each of the plain portions 130 are two-dimensionally spaced apart from each other on the electrode current collector 110, the electrode active material 120 ), It is possible to prevent the phenomenon that the electrode plate manufacturing array 100 is deformed.

For example, if the uncoated portion 130 continues in a continuous linear shape, due to the difference in strain between the uncoated portion 130 and the region of the electrode current collector 110 coated with the electrode active material 120 when the electrode active material 120 is dried. As the area where the electrode active material 120 is coated is relatively larger than the plain portion 130, the area of the electrode active material 120 may be bent or wrinkled around the plain portion 130. Therefore, there exists a problem that productivity and quality of a final electrode plate fall.

However, when each of the uncoated portion 130 is spread over the electrode current collector 110 as a whole, when drying the electrode active material 120, the effect due to the difference in strain is not even concentrated in a specific region, evenly distributed, the electrode plate array The phenomenon in which the 100 is deformed can be prevented as much as possible.

1 again, the active material applying step (S10) may be performed using a mask.

That is, after attaching a mask to a region corresponding to the plain portion 130 of the electrode current collector 110 (S11), after applying the electrode active material 120 to the electrode current collector 110 with the mask (S12) In operation S13, the mask may be removed from the electrode current collector 110.

In this case, the mask is preferably made of a material that does not chemically react with the electrode active material (120).

In addition, the mask may be made of a material that can be removed from the electrode current collector 110 while curling or twisting itself at a temperature condition for drying the electrode active material 120 later.

Next, the electrode plate punching step (S20) is a step of punching the electrode plate manufacturing array 100 into an electrode plate having a predetermined shape.

3 shows a punching line for punching the electrode plate manufacturing array 100 into a generally rectangular electrode plate. Referring to this, each electrode plate is disposed between the first line L1 and the second line L2. In addition, it can be seen that the second line L2 and the third line L3 are symmetrically disposed on the second line L2. In addition, each electrode plate is repeated in a form inverted up and down along a direction parallel to the second line L2.

For example, in the direction parallel to the second line L2 between the first line L1 and the second line L2, an electrode plate having half of the area of the first uncoated portion 131 at the top and the second at the bottom Electrode plates having half of the area of the uncoated portion 132 are alternately arranged. The uncoated portion 130 is a portion for forming the electrode tab in the electrode plate.

Furthermore, as shown in FIG. 4, the electrode plate manufacturing array 100 may be punched into a generally triangular electrode plate.

Referring to FIG. 4, likewise, each electrode plate is symmetrical to the second line L2 between the first line L1 and the second line L2 and between the second line L2 and the third line L3. You can see the enemy placed. In addition, each electrode plate is repeated in a form inverted up and down along a direction parallel to the second line L2.

For example, in the direction parallel to the second line L2 between the first line L1 and the second line L2, the electrode plate having the half of the area of the second uncoated portion 132 at the base side of the triangle is inversely opposite. On the upper side of the triangle, an electrode plate having half of the area of the first uncoated portion 131 is alternately arranged. At this time, two neighboring electrode plates share their hypotenuses.

As such, the triangular electrode plate and the inverted triangular electrode plate are joined to each other, and thus can be punched more space-efficiently, thereby minimizing unnecessary loss of the electrode plate manufacturing array 100.

Of course, it can also be punched by transforming / combining into electrode plates of various shapes as desired, and such a high degree of freedom of design is that each of the plain portions 130 are two-dimensionally spaced apart from each other on the electrode current collector 110. Is caused.

What has been described above is just one embodiment for carrying out the cylindrical lithium ion secondary battery according to the present invention, the present invention is not limited to the above-described embodiment, the subject matter of the present invention as claimed in the following claims Without departing from the technical spirit of the present invention to the extent that any person skilled in the art to which the present invention pertains various modifications can be made.

100: array for manufacturing electrode plates of secondary batteries
110: electrode current collector
120: an area where the electrode active material is coated in the electrode current collector
130: Unknown
131: first ignorance
132: second ignorance
133: third unknown
L1: first line
L2: second line
L3: third line

Claims (7)

Including an electrode current collector and an electrode active material applied to a portion of the electrode current collector,
An array for manufacturing an electrode plate of a secondary battery of the electrode current collector is provided with a plurality of non-coating portion that is not coated with the electrode active material is two-dimensionally spaced apart from each other on the electrode current collector. The method of claim 1,
The uncoated portion is a series of first uncoated portions arranged at specific intervals along an imaginary first line on the electrode current collector;
A series of second uncoated portions arranged at specific intervals along an imaginary second line spaced from the first line on the electrode current collector;
An array for manufacturing an electrode plate of a secondary battery, comprising a series of third uncoated parts arranged at specific intervals along a virtual third line spaced apart from the second line on the electrode current collector. The method of claim 2,
The second line is parallel to the first line,
And the second uncoated portion is arranged in such a manner that the first uncoated portion is moved in parallel in a direction of the first line by a specific offset. The method of claim 2,
The first plain portions are arranged at regular intervals,
The second line is parallel to the first line,
And the second uncoated part is arranged in a form in which the first uncoated part is moved in parallel with a distance corresponding to 1/2 of the distance between the first uncoated parts in the direction of the first line. The method of claim 2,
The second line is parallel to the first line,
And the third uncoated portion is arranged in a symmetrical form to the first uncoated portion with respect to the second line. A step of applying an electrode active material to a portion of the electrode current collector, a plurality of non-coating portion of the electrode current collector is not applied to the electrode current collector to be spaced two-dimensionally spaced apart from each other on the electrode current collector and
Method for producing an electrode plate of a secondary battery comprising the step of punching the electrode current collector into an electrode plate of a predetermined shape. The method of claim 6,
The step A is a process of attaching a mask to a region corresponding to the uncoated portion of the electrode current collector,
Applying the electrode active material to the electrode current collector to which the mask is attached; and
Drying the electrode active material, the electrode plate manufacturing method of a secondary battery comprising the step of removing the mask from the electrode current collector.

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