One]Cross Citation with Related Applications
[2]This application claims the benefit of priority based on Korean Patent Application No. 10-2019-0037774 dated April 01, 2019, and all contents disclosed in the documents of the Korean patent application are incorporated as a part of this specification.
[3]
technical field
[4]
The present invention relates to a secondary battery exterior material and a secondary battery exterior material manufacturing method and manufacturing apparatus, and more particularly, to a secondary battery exterior material and secondary battery exterior material manufacturing method and manufacturing apparatus, which can improve space utilization compared to the prior art. .
background
[5]
A secondary battery capable of repeatedly charging and discharging may be classified into a cylindrical secondary battery, a prismatic secondary battery, a pouch-type secondary battery, etc. according to a structure or a manufacturing method thereof. Among them, the pouch-type secondary battery has a structure in which an electrode assembly having a structure in which electrodes and a separator are alternately arranged in a sheet-shaped pouch case is accommodated. In particular, the pouch-type secondary battery is widely used because the manufacturing process is relatively simple and the manufacturing cost is low.
[6]
According to the prior art, in order to manufacture a pouch-type secondary battery, a forming process of pressing a portion of a sheet-shaped pouch by an area corresponding to the area of ​​the electrode assembly to form a recessed cup is performed. Then, the electrode assembly is mounted on the cup formed in the pouch. Thereafter, some areas of the pouch are attached to each other to form a sealing part.
[7]
The seal formed by attaching some regions of the pouch to each other is formed by attaching regions that are not pressed in the forming process to each other. Accordingly, due to the step difference between the non-formed sealing portion and the formed cup, a portion of the sealing portion is outside the width of the cup. In FIG. 1, a portion of the sealing part 3 formed on the upper and lower portions of the pouch 2 of the pouch-type secondary battery 1 manufactured according to the prior art protrudes beyond the width of the cup in which the electrode assembly is accommodated by P. appearance is shown.
[8]
The protruding area acts as a cause of an increase in dead space that does not contribute to capacity in the secondary battery, resulting in a problem in that the energy density of the secondary battery is lowered.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[9]
Accordingly, the problem to be solved by the present invention is to increase the energy density of the secondary battery by removing the dead space generated in the sealing part of the pouch-type secondary battery manufactured according to the prior art.
means of solving the problem
[10]
According to a first aspect of the present invention for achieving the above object, a first step of preparing a mold in which a sheet and a recess (I) having a recessed shape are formed; a second step of disposing the sheet so that a part of the sheet faces the indentation (I) of the mold; and supplying a fluid from the side of the mold toward the indentation (I) to form a forming portion having a shape corresponding to the indentation (I) in an area provided on the indentation (I) of the sheet third step; There is provided a method for manufacturing an exterior material for a secondary battery comprising a.
[11]
In the first step, the mold includes a first mold and a second mold provided on the first mold, and in the second step, a portion of the sheet is disposed between the first mold and the second mold. However, the indentation (I) of the first mold and the indentation (I) of the second mold may be provided to face each other.
[12]
In the second step, as the sheet is folded, the sheet is disposed between the first mold and the second mold in a state of being divided into a first sheet part and a second sheet part by a region to be folded, and the second mold In step 3, the fluid may be introduced between the first seat part and the second seat part.
[13]
The fluid may be air or a liquid that does not react with the sheet.
[14]
In the third step, the periphery of the indentation part I of the first mold among the first mold and the perimeter of the indentation part I of the second mold among the second molds are pressed against each other, so that the first mold The inner space formed by the indentation I of the mold and the indentation I of the second mold facing each other may be sealed from the outside.
[15]
In the second step, the sheet may be disposed such that a portion of the indentation portion I faces the sheet, and another portion of the indentation portion I does not face the sheet.
[16]
In the third step, a region of the sheet facing the indentation I is stretched by the supplied fluid, so that at least among the regions of the indentation I that did not face the sheet in the second step. A portion may face the sheet.
[17]
According to a second aspect of the present invention for achieving the above object, there is provided a mold having a recess (I) having a recessed shape; And a fluid supply device for supplying a fluid toward the indentation (I); Including, wherein the fluid supply device, the duct (duct) portion extending from the side of the mold in the direction of the indentation (I) and providing a path through which the fluid flows; There is provided an apparatus for manufacturing an exterior material for a secondary battery comprising a.
[18]
The mold includes a first mold and a second mold, and one or more grooves are formed in each of the first mold and the second mold, and the indentation part (I) of the first mold and the indentation part of the second mold (I) is provided to face each other, the groove of the first mold and the groove of the second mold are provided to face each other, and the groove of the first mold and the groove of the second mold are formed by facing each other The duct part may be inserted into the hole.
[19]
The duct portion may extend to the indentation (I) of the first mold and the indentation (I) of the second mold.
[20]
The duct part may extend to the groove of the first mold and the groove of the second mold.
[21]
A plurality of holes formed when the groove of the first mold and the groove of the second mold face each other may be formed.
[22]
A vertical cross-section of a hole formed when the groove of the first mold and the groove of the second mold face each other may have a circular shape, an oval shape, or a rectangular shape.
[23]
According to a third aspect of the present invention for achieving the above object, a forming part having a predetermined thickness (t) and having a space formed therein; and a sealing part formed around the forming part; Including, wherein the sealing part has a structure in which two sheets are adhered to each other in the entire area, and the sealing part is provided with a secondary battery exterior material spaced apart from one side of the forming part by a predetermined length (L).
[24]
The perimeter of the forming part is composed of four sides, the sealing part is formed along three of the four sides of the forming part, and the sealing part is a predetermined length (L) from one side of the four sides of the forming part on which the sealing part is not formed. ) may be spaced apart.
Effects of the Invention
[25]
According to the present invention, the energy density of the secondary battery can be increased by removing the dead space generated in the sealing part of the pouch-type secondary battery manufactured according to the prior art.
Brief description of the drawing
[26]
1 is a view showing the structure of a secondary battery manufactured according to the prior art.
[27]
2 is a perspective view illustrating a structure of a mold for manufacturing a secondary battery exterior material according to an embodiment of the present invention.
[28]
3 is a perspective view illustrating a structure of a mold for manufacturing an exterior material for a secondary battery according to another embodiment of the present invention.
[29]
4 is a perspective view showing a state in which the sheet is disposed to face the indentation of the mold according to the present invention in time series.
[30]
5 is a vertical cross-sectional view illustrating a state in which a first mold and a second mold face each other in a mold according to the present invention.
[31]
6 is a perspective view illustrating a state in which a forming part is formed on a sheet according to an embodiment of the present invention.
[32]
7 is a perspective view illustrating a state in which a forming part is formed on a sheet according to another embodiment of the present invention.
[33]
8 is a perspective view showing the appearance of the secondary battery packaging material manufactured according to the present invention.
Modes for carrying out the invention
[34]
Hereinafter, a structure of an apparatus for manufacturing a secondary battery exterior material according to the present invention will be described with reference to the drawings.
[35]
[36]
Apparatus for manufacturing exterior materials for secondary batteries
[37]
2 is a perspective view illustrating a structure of a mold for manufacturing a secondary battery exterior material according to an embodiment of the present invention, and FIG. 3 shows the structure of a mold for manufacturing a secondary battery exterior material according to another embodiment of the present invention. It is a perspective view. And, Figure 4 is a perspective view showing a state in which the sheet is arranged to face the indentation of the mold according to the present invention, Figure 5 is a first mold and a second mold facing each other in the mold according to the present invention This is a vertical cross-sectional view.
[38]
As shown in FIG. 2 , an apparatus for manufacturing an exterior material for a secondary battery according to the present invention (hereinafter, referred to as a 'manufacturing apparatus') may include a mold 100 . As shown in FIG. 2 , an indentation portion I having a depressed shape may be formed in the mold 100 . At this time, the indentation (I) may be spaced inwardly by a predetermined interval from all the outer periphery of the mold (100).
[39]
Meanwhile, as shown in FIG. 4 , the mold 100 according to the present invention may include a first mold 110 and a second mold 120 . As shown in FIG. 5 , the indentation I may be formed in both the first mold 110 and the second mold 120 , and the indentation I of the first mold 110 and the second mold The indentations I of 120 may be provided to face each other. In addition, the size and shape of the indentation part I of the first mold 110 and the size and shape of the indentation part I of the second mold 120 may be the same as each other. However, unlike this, the indentation I may be formed only in the first mold 110 or the second mold 120 .
[40]
4 and 5 , in the manufacturing apparatus according to the present invention, the first mold 110 may be provided at the lower part, and the second mold 120 may be provided at the upper part.
[41]
Meanwhile, as shown in FIGS. 2 and 3 , grooves G and G' may be formed in the first mold 110 and the second mold 120 of the manufacturing apparatus according to the present invention. According to an embodiment of the present invention, a plurality of grooves G formed in the first mold 110 and the second mold 120 may be formed, and according to another embodiment of the present invention, the first mold 110 may be formed. And, only one groove G ′ formed in the second mold 120 may be formed.
[42]
As shown in FIG. 2 , according to an embodiment of the present invention, the plurality of grooves G formed in the first mold 110 and the second mold 120 are the first mold 110 and the second mold 120 . ) may be formed spaced apart at equal intervals along the width direction, and as shown in FIG. 3 , according to another embodiment of the present invention, one groove formed in the first mold 110 and the second mold 120 . (G ′) may be formed to extend along the width direction of the first mold 110 and the second mold 120 . According to another embodiment of the present invention, the width of the groove G ′ may be 50% or more and 100% or less of the width of the first mold 110 and the second mold 120 . In addition, according to the present invention, the grooves G and G' formed in the first mold 110 and the second mold 120 are to be extended to one side of the indentation I as shown in FIGS. 2 and 3 . can
[43]
Similar to the case of the indentation I, the grooves G and G' may be formed in both the first mold 110 and the second mold 120 , and the grooves G and G of the first mold 110 . ') and the grooves G and G' of the second mold 120 may be provided to face each other. Also, the size and shape of the grooves G and G' of the first mold 110 and the size and shape of the grooves G and G' of the second mold 120 may be the same as each other. However, alternatively, the grooves G and G' may be formed only in the first mold 110 or the second mold 120 .
[44]
As described above, the grooves G and G' may be formed in both the first mold 110 and the second mold 120 , and the grooves G and G' and the second mold of the first mold 110 . The grooves G and G' of 120 may be provided to face each other. In this case, as the grooves G and G' of the first mold 110 and the grooves G and G' of the second mold 120 face each other, a hole may be formed in the mold 100 . Accordingly, the number of holes formed in the mold 100 may be the same as the number of grooves G and G' formed in the first mold 110 and the second mold 120 . Therefore, according to an embodiment of the present invention, there may be a plurality of holes formed in the mold 100 , and according to another embodiment of the present invention, there may be one hole formed in the mold 100 .
[45]
Meanwhile, the vertical cross-section of the hole formed in the mold 100 according to the present invention may have various shapes. For example, according to an embodiment of the present invention, the vertical cross section of the hole formed in the mold 100 may have a circular shape, an oval shape, or a rectangular shape, and according to another embodiment of the present invention, the mold 100 A vertical cross-section of the hole formed in the may have a rod shape elongated in the horizontal direction.
[46]
6 is a perspective view illustrating a form in which a forming part is formed on a sheet according to an embodiment of the present invention, and FIG. 7 is a perspective view showing a state in which a forming part is formed in a sheet according to another embodiment of the present invention.
[47]
6 and 7, the manufacturing apparatus according to the present invention may further include a fluid supply device for supplying a fluid toward the indentation (I, see FIGS. 2 to 5) formed in the mold 100. have. At this time, the fluid supply device is formed to extend from the side of the mold 100 in the direction of the indentation (I, see FIGS. 2 to 5 ), and duct parts 200 and 200' that provide a path for the fluid to flow. ) may be included. As shown in FIGS. 6 and 7 , the duct parts 200 and 200' are inserted into the holes formed when the holes (G, G', see FIGS. 2 to 5) of the first mold 110 face each other. can be
[48]
The widths of the duct parts 200 and 200 ′ may correspond to the widths of the grooves G and G′ (refer to FIGS. 2 to 5 ) of the first mold 110 and the second mold 120 . Accordingly, as shown in FIG. 6 , according to an embodiment of the present invention, the duct part 200 is provided in plurality, and the first mold 110 and the second mold 120 are formed between the duct parts 200 . The grooves may be spaced apart from each other by a distance spaced apart from each other. Alternatively, as shown in FIG. 7 , according to another embodiment of the present invention, the duct part 200 ′ is provided with one groove formed in the first mold 110 and the second mold 120 is the first The mold 110 and the second mold 120 may be formed by a width extending along the width direction.
[49]
On the other hand, as described above, the grooves (G, G', see FIGS. 2 to 5) formed in the first mold 110 and the second mold 120 are indented (G, G', as shown in FIGS. 2 and 3). I) can be connected. Accordingly, the duct portions 200 and 200 ′ are the indentation portion (I, see FIGS. 2 to 5 ) of the first mold 110 and the indentation portion (I, see FIGS. 2 to 5 ) of the second mold 120 ). can be extended up to However, unlike this, the duct portions 200 and 200 ′ are grooves (G, G′, see FIGS. 2 to 5 ) of the first mold 110 and grooves (G, G′, FIG. 2 ) of the second mold 120 . 2 to 5) may be extended.
[50]
[51]
Manufacturing method of exterior material for secondary battery
[52]
Hereinafter, a method for manufacturing an exterior material for a secondary battery according to the present invention will be described with reference to the foregoing and FIGS. 1 to 8 .
[53]
2 to 5, the secondary battery packaging material manufacturing method according to the present invention, the first step of preparing the mold 100 and the sheet 10 in which the indentation part I is formed, and the sheet 10 It may include a second step of disposing the sheet 10 so that a portion of the mold 100 faces the indentation (I).
[54]
In this case, in the first step, the mold 100 may include the first mold 110 and the second mold 120 provided on the first mold 110 .
[55]
In addition, in the second step, a portion of the sheet 10 is provided between the first mold 110 and the second mold 120 , the indentation I of the first mold 110 and the second mold 120 . ) of the indentation (I) may be provided to face each other.
[56]
Meanwhile, as shown in FIG. 4 , in the second step, the sheet 10 may be disposed between the first mold 110 and the second mold 120 in a folded state. Accordingly, as shown in FIG. 4 , the sheet 10 may be divided into a first sheet portion 12 and a second sheet portion 14 with the folded region as a boundary. In FIG. 4 , in the second step, the first sheet part 12 is disposed adjacent to the first mold 110 , and the second sheet part 14 is disposed adjacent to the second mold 120 . is shown. In addition, in the second step, the sheet 10 may be arranged such that the boundary between the first sheet portion 12 and the second sheet portion 14 and the folding area of ​​the sheet face the inside of the molds 110 and 120 . .
[57]
On the other hand, as shown in FIG. 4 , in the second step, some areas of the indentations I face the sheet 10 and other partial areas of the indentations I do not face the sheet 10 . can be placed. That is, according to the present invention, in the second step, the indentation I of the first mold 110 and the second mold 120 and the sheet 10 may overlap each other only in a partial area. 4 shows a state in which a partial region of the indentation of the first mold 110 and a partial region of the first sheet portion 12 of the sheet 10 overlap each other, and a partial region of the indentation of the second mold 120 and the sheet A state in which some regions of the second sheet portion 14 of (10) overlap each other is illustrated.
[58]
6 and 7, the secondary battery packaging material manufacturing method according to the present invention, by supplying a fluid from the side of the mold 100 toward the indentation (I, see FIGS. 2 to 5), the sheet 10 The method may further include a third step of forming a forming part 22 (refer to FIG. 8 ) having a shape corresponding to the indentation part in a region provided on the indentation part.
[59]
6 and 7, the fluid supplied toward the indentation in the third step flows into the space between the first seat portion 12 (refer to FIG. 4) and the second seat portion 14 (refer to FIG. 4). can be
[60]
The fluid supplied toward the indentation in the third step may be a fluid that does not react with the seat. For example, the fluid may be air or a liquid that does not react with the sheet. Therefore, according to the present invention, it is possible to prevent the sheet or the surface of the sheet from being denatured by the reaction between the fluid and the sheet in the third step.
[61]
On the other hand, as described above, the indentation (I, see FIGS. 2 to 4) of the mold 100 may be spaced inwardly from all the outer periphery of the mold 100 by a predetermined interval.
[62]
Therefore, in the third step, the periphery of the indentation (I, see FIGS. 2 to 5 ) of the first mold 110 of the first mold 110 and the second mold 120 of the second mold 120 . The periphery of the indentation (I, FIGS. 2 to 5) of the is pressed by each other, so that the indentation (I) of the first mold 110 and the indentation (I) of the second mold 120 face each other The inner space formed by this can be sealed from the outside. By this pressurization, the inner space formed by the indentation part of the first mold and the indentation part of the second mold is sealed from the outside, and at the same time, even if the fluid is supplied toward the indentation part of the first mold and the second mold in the third step Regions of the sheet disposed on the periphery of the indentations of the first mold and the second mold may be fixed at a point on the first mold and the second mold without slipping.
[63]
On the other hand, as described above, in the second step, some areas of the indentations I of the mold 100 face the sheet 10 , and other areas of the indentations I of the mold 100 face the sheet 10 . ) so as not to face the sheet 10 may be arranged.
[64]
However, in the third step, due to the pressure of the fluid supplied toward the indentation portion I of the mold 100 , the fluid is moved in the region facing the indentation portion I of the mold 100 of the sheet 10 . By stretching in this direction, at least a portion of the indentation portion I that did not face the sheet 10 in the second step may face the sheet 10 . However, even in this case, the region disposed on the periphery of the indentation I of the first mold 110 and the second mold 120 of the sheet 10 is the first mold 110 and the second mold 120 . ) may still be fixed without sliding on the first mold 110 and the second mold 120 by the pressure between them.
[65]
More preferably, in the third step, by the pressure of the fluid supplied toward the indentation (I) of the mold 100, the region facing the indentation (I) of the mold 100 of the sheet 10 is By stretching, the entire region of the indentation I that did not face the sheet 10 in the second step may face the sheet 10 .
[66]
[67]
Exterior material for secondary battery
[68]
8 is a perspective view showing the appearance of the secondary battery packaging material manufactured according to the present invention.
[69]
The secondary battery exterior material (20, hereinafter referred to as 'exterior material') according to the present invention has a predetermined thickness t and a forming portion 22 having a space formed therein, and the forming portion 22. It may include a sealing portion 24 that is formed.
[70]
The space formed inside the forming part 22 of the exterior material 20 is formed by the aforementioned indentation I of the first mold 110 and the indentation I of the second mold 120 facing each other. It may have a size and shape corresponding to the space. In addition, the sealing part 24 of the exterior material 20 is the periphery of the indentation part I of the first mold 110 of the first mold 110 , or the second part of the second mold 120 . 2 It may have a size and shape corresponding to the periphery of the indentation part I of the mold 120 .
[71]
As described above, in the third step of the method for manufacturing a secondary battery packaging material according to the present invention, the periphery of the indentation part I of the first mold 110 and the perimeter of the indentation part I of the second mold 120 are Since they are pressed against each other, the perimeter of the indentation I of the first mold 110 and the perimeter of the indentation I of the second mold 120 among the first and second sheet portions 12 and 14 . Regions disposed between the portions may be adhered to each other. Accordingly, as shown in FIG. 8 , the entire area of ​​the sealing part 24 of the exterior material 20 may have a structure in which two sheets are adhered to each other.
[72]
In addition, as described above, in the third step of the method for manufacturing a secondary battery exterior material according to the present invention, the region facing the indentation I of the mold 100 of the sheet 10 is stretched in the direction in which the fluid moves. can Accordingly, as shown in FIG. 8 , the sealing part 24 may be spaced apart from one side of the forming part 22 by a predetermined length (L).
[73]
In more detail, the perimeter of the forming portion 22 of the exterior material 20 may be composed of four sides. In addition, the sealing part 24 may be formed along three of the four sides around the forming part 22 . In this case, the sealing part 24 may be spaced apart by a predetermined length L from one side of the four sides around the forming part 22 on which the sealing part 24 is not formed.
[74]
[75]
According to the present invention, since the secondary battery packaging material 20 is manufactured so that the sealing portion 24 is spaced apart from one side of the forming portion 22 by a predetermined length (L), sealing of the pouch-type exterior material manufactured according to the prior art Since the part 3 (refer to FIG. 1) does not deviate from the width of the secondary battery 1 (refer to FIG. 1), the energy density of the secondary battery may be increased by removing a dead space generated in the sealing part.
[76]
[77]
Although the present invention has been described with reference to limited examples and drawings, the present invention is not limited thereto, and it is described below with the technical idea of ​​the present invention by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various implementations are possible within the equivalent scope of the claims.

WE CLAIMS

A first step of preparing a mold in which the indentation (I) having a sheet and a recessed shape is formed; a second step of disposing the sheet so that a part of the sheet faces the indentation (I) of the mold; and supplying a fluid from the side of the mold toward the indentation (I) to form a forming portion having a shape corresponding to the indentation (I) in an area provided on the indentation (I) of the sheet third step; A method for manufacturing an exterior material for a secondary battery comprising a.
[Claim 2]
The method according to claim 1, In the first step, the mold includes a first mold and a second mold provided on an upper portion of the first mold, and in the second step, a portion of the sheet is formed between the first mold and the second mold. Doedoe provided between two molds, a method for manufacturing a secondary battery exterior material provided so that the indentation (I) of the first mold and the indentation (I) of the second mold face each other.
[Claim 3]
The method according to claim 2, In the second step, as the sheet is folded, the sheet is divided into a first sheet portion and a second sheet portion with a boundary between the folded area and disposed between the first mold and the second mold and, in the third step, the fluid is introduced between the first sheet part and the second sheet part.
[Claim 4]
The method according to claim 1, wherein the fluid is air or a liquid that does not react with the sheet.
[Claim 5]
The method according to claim 2, In the third step, the peripheral portion of the indentation portion (I) of the first mold among the first mold and the peripheral portion of the indentation portion (I) of the second mold among the second molds are pressed against each other , A method for manufacturing a secondary battery exterior material in which the inner space formed by the indentation (I) of the first mold and the indentation (I) of the second mold facing each other is sealed from the outside.
[Claim 6]
The method according to claim 1, In the second step, a portion of the indentation (I) is facing the sheet, and the other partial area of ​​the indentation (I) is for a secondary battery disposing the sheet so as not to face the sheet Exterior material manufacturing method.
[Claim 7]
The method according to claim 6, In the third step, the region facing the indentation (I) of the sheet is stretched by the supplied fluid, so that in the second step of the indentation (I), it does not face the sheet. A method of manufacturing an exterior material for a secondary battery in which at least a portion of the non-existent area faces the sheet.
[Claim 8]
a mold in which the recess (I) having a recessed shape is formed; And a fluid supply device for supplying a fluid toward the indentation (I); Including, wherein the fluid supply device, the duct (duct) portion extending from the side of the mold in the direction of the indentation (I) and providing a path through which the fluid flows; A secondary battery exterior material manufacturing apparatus comprising a.
[Claim 9]
The method according to claim 8, wherein the mold includes a first mold and a second mold, and at least one groove is formed in each of the first mold and the second mold, and the indentation (I) of the first mold and the second mold The indentations I of the mold are provided to face each other, the grooves of the first mold and the grooves of the second mold are provided to face each other, and the grooves of the first mold and the grooves of the second mold face each other An apparatus for manufacturing an exterior material for a secondary battery in which the duct part is inserted into a hole formed by looking.
[Claim 10]
The apparatus of claim 9, wherein the duct part extends to the indentation part (I) of the first mold and the indentation part (I) of the second mold.
[Claim 11]
The apparatus of claim 9 , wherein the duct part extends to the groove of the first mold and the groove of the second mold.
[Claim 12]
The apparatus of claim 9 , wherein a plurality of holes formed when the grooves of the first mold and the grooves of the second mold face each other are formed.
[Claim 13]
The apparatus of claim 9 , wherein a vertical cross-section of a hole formed when the groove of the first mold and the groove of the second mold face each other has a circular shape, an oval shape, or a rectangular shape.
[Claim 14]
a forming part having a predetermined thickness (t) and having a space therein; and a sealing part formed around the forming part; Including, wherein the sealing portion has a structure in which two sheets are adhered to each other in the entire region, and the sealing portion is spaced apart from one side of the forming portion by a predetermined length (L).
[Claim 15]
The method according to claim 14, The periphery of the forming portion is composed of four sides, the sealing portion is formed along three of the four sides of the forming portion, the sealing portion is predetermined from one side of the four sides of the forming portion on which the sealing portion is not formed. A secondary battery exterior material that is spaced apart by the length (L) of