The present invention relates to a pouch-type secondary battery and a battery module.
background art
[5]
Secondary batteries capable of repeated charging and discharging may be classified into cylindrical secondary batteries, prismatic secondary batteries, pouch-type secondary batteries, and the like, depending on their structures and manufacturing methods. Among them, the pouch-type secondary battery is manufactured by accommodating an electrode assembly in a pouch-type sheet and then sealing the sheet. Compared to other types of secondary batteries, the pouch-type secondary battery has a simple structure and a large capacity per unit volume, such as a car battery or an energy storage device. It is widely used.
[6]
More specifically, in a pouch-type secondary battery, after forming a cup in a recessed shape in a pouch-type sheet, an electrode assembly is accommodated in the cup, and the pouch-type sheet is folded so that one area of the pouch-type sheet is the electrode assembly and It is common to manufacture by covering the electrode assembly and then forming a sealing portion to seal the periphery of the electrode assembly. It is common for such a sealing part to have a shape protruding outward.
[7]
Meanwhile, a battery module in which a plurality of secondary batteries is disposed is manufactured for use in an electronic device (eg, an energy storage device) requiring a large electric capacity. The battery module is provided with not only the secondary battery but also parts disposed near the secondary battery. According to the prior art, since the seal formed on the pouch-type secondary battery protrudes outward, the parts of the battery module disposed near the secondary battery and There was an interfering problem. When such interference occurs, there is a problem that the sealing part of the secondary battery is broken, and when the bending is severe, the secondary battery is damaged. When the secondary battery is damaged, not only the damaged secondary battery but also the safety of the battery module including the secondary battery is adversely affected.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[8]
The problem to be solved by the present invention is to improve the safety of the battery module by mitigating the degree of external protrusion of the sealing part in the pouch type secondary battery, thereby solving the problem of interference between the secondary battery and other parts during manufacturing the battery module.
means of solving the problem
[9]
According to one aspect of the present invention for achieving the above object, an electrode assembly having a structure in which electrodes and separators are alternately disposed; and a pouch-type exterior material accommodating the electrode assembly. Including, the exterior material, a receiving portion in which a space for accommodating the electrode assembly is formed; and a sealing portion formed along a circumference of the accommodating portion and formed by attaching portions of the exterior material to each other so as to seal the accommodating portion from the outside. Including, a plurality of edges are formed in the sealing portion, at least one of the plurality of edges, recessed toward the electrode assembly; and an oblique portion formed adjacent to the indentation and formed in an oblique direction (S) toward the indentation while intersecting the longitudinal direction (L) of the exterior material. There is provided a pouch type secondary battery comprising a.
[10]
The indentation portion may be formed in a curved shape indented toward the electrode assembly.
[11]
The oblique portion may be formed as a straight line.
[12]
The indented portion and the oblique portion may directly contact each other.
[13]
All areas of the indentation portion may be placed in an area adjacent to the electrode assembly based on a virtual line extending in the oblique direction S of the oblique portion.
[14]
an electrode lead electrically connected to the electrode assembly and protruding outward from the sealing part; Further, the indented portion and the slanted portion may be formed at a corner formed on one side of the electrode lead.
[15]
The recessed portion may directly contact a region of the sealing portion from which the electrode lead protrudes.
[16]
The electrode lead may include a first electrode lead protruding from one side of the sealing portion; and a second electrode lead protruding from the other side opposite to the one side of the sealing part. Including, the indented portion and the slanted portion may be formed at a corner formed on one side of the first electrode lead and a corner formed on one side of the second electrode lead, respectively.
[17]
According to another aspect of the present invention for achieving the above object, a battery module including the secondary battery is provided.
[18]
The secondary batteries may be provided in plurality, and the plurality of secondary batteries may be arranged such that the recessed portions respectively formed in the plurality of secondary batteries face each other and the oblique portions respectively formed in the plurality of secondary batteries face each other. there is.
Effects of the Invention
[19]
According to the present invention, the safety of the battery module can be improved by mitigating the degree of external protrusion of the sealing part in the pouch-type secondary battery, thereby solving the problem of interference between the secondary battery and other parts during manufacture of the battery module.
Brief description of the drawing
[20]
1 is a plan view showing the structure of a pouch-type secondary battery according to the present invention.
[21]
2 is an enlarged plan view showing the appearance of the corner of the sealing part in the pouch-type secondary battery according to the present invention.
[22]
3 is an enlarged cross-sectional view showing a state in which a coating unit is further formed in the pouch-type secondary battery according to the present invention.
[23]
Mode for Carrying Out the Invention
[24]
Hereinafter, a pouch type secondary battery and battery module according to the present invention will be described with reference to the drawings.
[25]
[26]
Pouch type secondary battery
[27]
[28]
1 is a plan view showing the structure of a pouch-type secondary battery according to the present invention.
[29]
As shown in FIG. 1, a pouch-type secondary battery (10, hereinafter, referred to as a 'secondary battery') according to the present invention includes an electrode assembly 100 and a pouch-type exterior material 200 (hereinafter, hereinafter, referred to as 'exterior materials'). The electrode assembly 100 may have a structure in which electrodes and separators are alternately disposed in the thickness direction, and the exterior material 200 may have a sheet structure having a thin thickness.
[30]
The electrode assembly 100 may include a body portion 100a constituting the body of the electrode assembly and an electrode tab 110 protruding in one direction from the body portion. The electrode tab 110 may include a first electrode tab 112 and a second electrode tab 114 . As shown in FIG. 1 , according to an embodiment of the present invention, the first electrode tab 112 and the second electrode tab 114 are respectively one side of the body part 100a of the electrode assembly and the opposite side of the one side. It may extend from the other side formed on. In this case, the first electrode tab 112 and the second electrode tab 114 may extend in opposite directions from the body portion 100a. However, according to another embodiment of the present invention, both the first electrode tab 112 and the second electrode tab 114 may extend from one side of the body of the electrode assembly 100 . In this case, the first electrode tab 112 and the second electrode tab 114 may extend in the same direction from the body portion 100a and may be provided adjacent to each other. Also, the first electrode tab 112 may be a positive electrode tab, and the second electrode tab 114 may be a negative electrode tab.
[31]
On the other hand, the packaging material 200 is formed by attaching some areas of the packaging material 200 to each other so that the accommodation portion 210 and the accommodation portion are formed along the circumference where the space for accommodating the electrode assembly 100 is formed and the accommodation portion is sealed from the outside. It may include a sealing portion 220 to be.
[32]
Continuing to refer to FIG. 1 , the secondary battery 10 according to the present invention may further include an electrode lead 300 electrically connected to the electrode assembly 100 . More specifically, the electrode lead 300 may be electrically connected to the electrode assembly 100 by being directly connected to the electrode tab 110 .
[33]
The electrode lead 300 may include a first electrode lead 310 and a second electrode lead 320 . The first electrode lead 310 may be directly connected to the first electrode tab 112 , and the second electrode lead 320 may be directly connected to the second electrode tab 114 . As described above, since the first electrode tab 112 may be a positive electrode tab and the second electrode tab 114 may be a negative electrode tab, the first electrode lead 310 directly connected to the first electrode tab 112 may be It may be a positive lead, and the second electrode lead 320 directly connected to the second electrode tab 114 may be a negative lead.
[34]
Meanwhile, as shown in FIG. 1 , according to the present invention, the electrode lead 300 may protrude outward from the sealing portion 220 . In more detail, according to one embodiment of the present invention, the first electrode lead 310 may protrude from one side of the sealing portion 220, and the second electrode lead 320 is the above portion of the sealing portion 220. It may protrude from the other side formed on the opposite side of one side. However, according to another embodiment of the present invention, both the first electrode lead 310 and the second electrode lead 320 may protrude from one side of the sealing portion 220 .
[35]
Meanwhile, as shown in FIG. 1 , in the secondary battery 10 according to the present invention, a plurality of corners E may be formed on the sealing portion 220 . In this case, in the present specification, 'corner' is defined as a region protruding outward from the circumference of an object when the object is viewed at a glance. In FIG. 1 , one each of the first electrode lead 310 and the second electrode lead 320 in the vertical direction of the secondary battery 10 (ie, one on the upper side and one on the lower side of the first electrode lead, and One on the upper side and one on the lower side of the electrode lead), a state in which a total of four corners E are formed is shown.
[36]
[37]
2 is an enlarged plan view showing the appearance of the corner of the sealing part in the pouch-type secondary battery according to the present invention.
[38]
Referring to FIGS. 1 and 2 , at least one of the plurality of edges E is formed adjacent to the indentation portion 222 that is indented toward the electrode assembly 100 and the indentation portion, and the length of the exterior material 200 It may include an oblique portion 224 formed in an oblique direction S toward the indentation while intersecting the direction L. That is, according to the present invention
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5,000 character limit. Use the arrows to translate more., the oblique direction (S) may not be parallel to the longitudinal direction (L) of the packaging material.
[39]
At this time, the recessed portion 222 may be formed in a curved shape recessed toward the electrode assembly 100 as shown in FIG. 2 . However, the recessed portion 222 may have a recessed shape and may be made of straight lines.
[40]
Meanwhile, the oblique portion 224 may be formed in a straight line along the oblique direction S. In addition, the indented portion 222 and the oblique portion 224 may be in direct contact with each other. That is, one end of the indented portion 222 may be connected to one end of the oblique portion 224 .
[41]
More preferably, according to the present invention, as shown in FIG. 2, all regions of the indented portion 222 are based on an imaginary line extending in the oblique direction S, which is the direction in which the oblique portion 224 extends. It may be placed in an area adjacent to the electrode assembly 100 .
[42]
[43]
According to the present invention, since the oblique portion 224 is formed in the sealing portion 220 of the exterior material 200 of the secondary battery 10, the protrusion protrudes outward compared to the case where the oblique portion 224 is not formed. Area D (see FIG. 2) disappears.
[44]
According to the prior art, in the process of manufacturing a pouch-type secondary battery, the protruding area D is formed along with the sealing part, and as a result, there is a problem in that assembly quality and safety of the battery module are also deteriorated. That is, in the process of manufacturing the battery module, interference occurs between the protruding area D formed in the sealing part and other parts of the battery module, resulting in a problem in that the sealing part is bent or the secondary battery is damaged. This also adversely affected the safety of the battery module.
[45]
However, according to the present invention, by removing the protruding area D existing in the sealing part in the related art, it is possible to solve the above problems caused by the presence of the protruding area D.
[46]
On the other hand, according to the present invention, the indented portion 222 and the oblique portion 224 formed in the sealing portion 220 are formed at the corners formed on one side of the electrode lead 300, as shown in FIGS. 1 and 2. can be formed More preferably, the recessed portion 222 may directly contact a region of the sealing portion 220 where the electrode lead 300 protrudes.
[47]
In addition, according to the present invention, the indented portion 222 and the oblique portion 224 may be formed at a corner formed on one side of the first electrode lead 310 and a corner formed on one side of the second electrode lead 320, respectively. can FIG. 1 shows a state in which recessed portions 222 and oblique portions 224 are formed at corners respectively formed on the lower side of the first electrode lead 310 and the lower side of the second electrode lead 320 .
[48]
[49]
3 is an enlarged cross-sectional view showing a state in which a coating unit is further formed in the pouch-type secondary battery according to the present invention.
[50]
1 to 3, the exterior material 200 of the pouch-type secondary battery 10 according to the present invention is, for example, an aluminum sheet (L1) and a protective layer (L2) located on both sides of the aluminum sheet (L1). ) may be included. At this time, the protective layer (L2) may include a resin material, or may include a resin and nylon material. Here, the protective layer (L2) may be formed of one or more layers, for example. In addition, the exterior material 200 includes an upper case and a lower case, and may pressurize the outer circumferential surfaces of the upper case 200a and the lower case 200b to form a sealing part 220 through thermal fusion and seal.
[51]
Meanwhile, in the pouch-type secondary battery 10 according to the present invention, as an additional example, a coating portion 230 coated to surround the indented portion 222 and the oblique portion 224 may be further formed.
[52]
That is, the coating portion 230 may be coated so that the outer surfaces of the indented portion 222 and the oblique portion 224 are not exposed to the outside.
[53]
Accordingly, when the indented portion 222 and the oblique portion 224 are formed by cutting the sealing portion 220 of the exterior material 200, the end of the aluminum sheet L1 of the exterior material 200 through the coating portion 230 It is possible to prevent the problem of being exposed to the outside and being energized. Alternatively, the coating portion 230 of the indented portion 222 and the slanted portion 224 is damaged by an external force, or other parts are damaged by the angular portion of the indented portion 222 and the slanted portion 224 of the secondary battery 10. can prevent it from happening.
[54]
In this case, the coating unit 230 may include an insulating material. Here, the coating unit 230 may include silicon, for example. That is, the coating portion 230 includes silicon, which is a material having excellent heat resistance, chemical resistance, insulation, and waterproofness, to prevent the end of the aluminum sheet L1 from being exposed to the outside and being energized, and to prevent the secondary battery 10 from being energized. It is not damaged or dissolved when heated, and the indented portion 222 and the oblique portion 224 can be protected from the external environment.
[55]
At this time, when the indentation part 222 is composed of, for example, zigzag straight lines to form a plurality of bent parts, damage to the plurality of bent parts due to external environment can be prevented through the coating part 230. . However, the indentation 222 of the present invention is not necessarily limited to being made of zigzag straight lines.
[56]
[57]
battery module
[58]
[59]
The battery module according to the present invention may include a plurality of the aforementioned secondary batteries 10 . The description of the secondary battery 10 is replaced with the above description.
[60]
Meanwhile, according to the present invention, the plurality of secondary batteries 10 constituting the battery module may be arranged so that the recesses 222 respectively formed on the plurality of secondary batteries face each other, and the diagonal lines formed on the plurality of secondary batteries, respectively. Sections 224 may also be arranged to face each other. Therefore, in the case of the battery module according to the present invention, compared to the prior art, since the empty space formed by the oblique portion 224 can be additionally secured, interference between the secondary battery and other parts in the battery module can be prevented. And, space utilization of the battery module can be increased.
[61]
[62]
Although the present invention has been described above with limited examples and drawings, the present invention is not limited thereto, and is described below with the technical spirit of the present invention by those skilled in the art to which the present invention belongs. Of course, various implementations are possible within the scope of equivalents of the claims to be made.
[63]
[Description of code]
[64]
10: secondary battery
[65]
100: electrode assembly
[66]
100a: body part
[67]
110: electrode tab
[68]
112: first electrode tab
[69]
114: second electrode tab
[70]
200: exterior material
[71]
210: receiving unit
[72]
220: sealing part
[73]
222: indentation
[74]
224: oblique part
[75]
300: electrode lead
[76]
310: first electrode lead
[77]
320: second electrode lead
[78]
D: protrusion area
[79]
E: edge of seal
[80]
L: longitudinal direction of exterior material
[81]
S: oblique direction.

we claim

[Claim 1]
An electrode assembly having a structure in which electrodes and separators are alternately disposed; and a pouch-type exterior material accommodating the electrode assembly. Including, the exterior material, a receiving portion in which a space for accommodating the electrode assembly is formed; and a sealing portion formed along a circumference of the accommodating portion and formed by attaching portions of the exterior material to each other so as to seal the accommodating portion from the outside. Including, a plurality of edges are formed in the sealing portion, at least one of the plurality of edges, recessed toward the electrode assembly; and an oblique portion formed adjacent to the indentation and formed in an oblique direction (S) toward the indentation while intersecting the longitudinal direction (L) of the exterior material. Pouch-type secondary battery comprising a.
[Claim 2]
The pouch-type secondary battery of claim 1, wherein the recessed portion is formed in a curved shape recessed toward the electrode assembly.
[Claim 3]
The pouch-type secondary battery of claim 2, wherein the oblique portion is formed in a straight line.
[Claim 4]
The pouch-type secondary battery of claim 3, wherein the indented portion and the oblique portion directly contact each other.
[Claim 5]
The pouch-type secondary battery of claim 1, wherein all areas of the indented portion are placed in an area adjacent to the electrode assembly based on a virtual line extending in the oblique direction (S) of the oblique portion.
[Claim 6]
The electrode lead of claim 1, electrically connected to the electrode assembly and protruding outward from the sealing part; The pouch-type secondary battery further includes, wherein the indented portion and the oblique portion are formed at a corner formed on one side of the electrode lead.
[Claim 7]
The pouch-type secondary battery of claim 6, wherein the indented portion directly contacts a region of the sealing portion where the electrode lead protrudes.
[Claim 8]
The method of claim 6, wherein the electrode lead, the first electrode lead protrudes from one side of the sealing portion; and a second electrode lead protruding from the other side opposite to the one side of the sealing part. The pouch-type secondary battery of claim 1 , wherein the indented portion and the oblique portion are respectively formed at a corner formed on one side of the first electrode lead and a corner formed on one side of the second electrode lead.
[Claim 9]
The pouch-type secondary battery of claim 1, further comprising a coating portion coated to surround the indented portion and the oblique portion.
[Claim 10]
A battery module comprising the secondary battery according to claim 1.
[Claim 11]
The method of claim 10, wherein the secondary battery is provided in plurality, the plurality of secondary batteries are arranged such that the indented portions respectively formed on the plurality of secondary batteries face each other, and the oblique portions respectively formed on the plurality of secondary batteries face each other. A battery module arranged for viewing.