Softly-packaged battery cell and method for manufacturing same

Abstract

A pouch type battery cell according to an embodiment of the present disclosure may include an electrode assembly accommodated between a pair of cases, each of the pair of cases including a first resin layer constituting an innermost layer, a second resin layer constituting an outermost layer, and a metal layer laminated between the first resin layer and the second resin layer. The pouch-type battery cell may include: a cup portion provided in at least one of the pair of cases and accommodating the electrode assembly; an insulating sealing portion at which the first resin layers of the pair of housings are sealed from each other; a folding portion folded such that an edge of one of the pair of housings surrounds an edge of the other housing; and a metal sealing part which is provided at the folded part, and at which the metal layers of the pair of housings are sealed from each other.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the priority of Korean Patent Application No. 10-2022-0087829 filed on July 15, 2022 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference. Technical Field

[0004] The present disclosure relates to a soft-pack type battery cell and a method for manufacturing the soft-pack type battery cell, in which an electrode assembly is accommodated between a pair of shells, each of the pair of shells including a first resin layer constituting an innermost layer, a second resin layer constituting an outermost layer, and a metal layer stacked between the first resin layer and the second resin layer. Background Art

[0005] Recently, secondary batteries have attracted attention as energy sources for electric vehicles (EV), hybrid electric vehicles (HEV), etc., which are proposed as a solution to problems such as air pollution caused by existing gasoline vehicles, diesel vehicles, etc. using fossil fuels.

[0006] While small mobile devices use one or several secondary batteries, medium to large devices such as electric vehicles use a battery module in which a plurality of secondary batteries are electrically connected to each other or a battery pack in which a plurality of battery modules are electrically connected to each other due to the need for high output and large capacity.

[0007] It can be said that one of the most popular secondary batteries among the currently commercialized secondary batteries is the lithium secondary battery. According to the shape of the external material, lithium secondary batteries can be classified into can type, square type, soft pack type, etc. Among these batteries, soft pack type secondary batteries are widely used in medium to large battery modules due to their high energy density and easy stacking advantages.

[0008] Recently, as the demand for secondary battery modules installed in vehicles has increased, consumers' requirements for stability have gradually increased. Consumers require that the energy density of battery cells be increased in the limited space of secondary battery modules. In this case, there is a problem of increasing stability risks associated with fire and explosion of battery cells.

[0009] Generally, a pouch type battery cell has a structure in which an electrode assembly is accommodated in a pouch type battery case and a sealing portion is provided at an edge of the battery case.

[0010] When the temperature of the battery exceeds the critical temperature due to abnormal heating, etc., the temperature may rise rapidly and heat propagation (TP) to other surrounding battery cells may occur. Therefore, safety issues may arise. Therefore, it is necessary to implement a sealing portion with higher heat resistance and sealing strength to prevent or sufficiently delay heat propagation. Summary of the invention

[0011] Technical issues

[0012] One aspect of the present disclosure provides a pouch type battery cell in which a sealing part has high heat resistance and sealing strength, and a method of manufacturing the pouch type battery cell.

[0013] Technical Solution

[0014] In a soft-pack type battery cell according to an embodiment of the present disclosure, an electrode assembly may be accommodated between a pair of shells, each of the pair of shells including a first resin layer constituting an innermost layer, a second resin layer constituting an outermost layer, and a metal layer stacked between the first resin layer and the second resin layer: a first resin layer, the first resin layer; a second resin layer, the second resin layer; and a metal layer, the metal layer stacked between the first resin layer and the second resin layer. The soft-pack type battery cell may include: a cup portion, which is provided in at least one of the pair of shells and accommodates the electrode assembly; an insulating sealing portion, at which the first resin layers of the pair of shells are sealed to each other; a folding portion, which is folded so that an edge of one of the pair of shells surrounds an edge of the other shell; and a metal sealing portion, which is provided at the folding portion, and at which the metal layers of the pair of shells are sealed to each other.

[0015] The metal sealing portion may be provided at an outer side than the insulating sealing portion.

[0016] The metal sealing portion may include: a first metal sealing portion, at which one surface of the metal layer of another shell is sealed with the metal layer of one shell; and a second metal sealing portion, at which the other surface of the metal layer of another shell is sealed with the metal layer of one shell.

[0017] The first resin layer and the second resin layer may be removed from the metal seal portion.

[0018] The first resin layer may be removed from the metal seal portion, and the second resin layer may be removed from either of the two outer surfaces of the folded portion.

[0019] The metal layer may include a stainless steel material.

[0020] According to an embodiment of the present disclosure, a method for manufacturing a soft-pack type battery cell may include: accommodating an electrode assembly in a cup portion formed in at least one of the pair of shells; sealing the first resin layers of the pair of shells to each other; forming a folded portion by folding an edge of one shell of the pair of shells so that the edge surrounds an edge of the other shell; and sealing the metal layers to each other at the folded portion.

[0021] When the first resin layers are sealed to each other, the first resin layers may be thermally fused to each other, and when the metal layers are sealed to each other, the metal layers may be welded to each other by laser.

[0022] The edge of each of the pair of shells may include an exposed area in which the first resin layer is removed and the metal layer is exposed to the inside, and when the folded portion is formed, the exposed area of ​​one shell may surround the exposed area of ​​the other shell.

[0023] When the metal layers are sealed to each other, the laser may be irradiated onto one of the two outer surfaces of the folded portion from which the second resin layer is removed.

[0024] Beneficial Effects

[0025] According to a preferred embodiment of the present disclosure, a metal seal can be formed at the folded portion to maintain the seal of the soft-pack type battery cell and have a high seal strength even under high temperature and high pressure. Therefore, when an abnormally high temperature is generated in the electrode assembly, the occurrence of heat propagation (TP) to other battery cells can be prevented or substantially delayed.

[0026] In addition, an insulating sealing portion may be formed inside the metal sealing portion to keep the case in a state of being insulated from the electrode assembly and the electrolyte.

[0027] The metal seal portion may be doubly sealed so that the sealing strength of the metal seal portion is further increased.

[0028] When compared with a case in which no folded portion is formed, the ratio of the gap between the metal layers to the thickness of the folded portion may be reduced, thereby improving the quality of laser welding.

[0029] In addition, effects that can be easily predicted by a person of ordinary skill in the art from the configuration according to the preferred embodiment of the present disclosure can be included. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings attached to this specification illustrate preferred embodiments of the present disclosure and are used to further understand the technical spirit of the present disclosure and the detailed description of the present disclosure. The present disclosure should not be interpreted as being limited to the accompanying drawings.

[0031] In the attached picture:

[0032] Figure 1is a perspective view showing a case and an electrode assembly of a pouch-type battery cell according to an embodiment of the present disclosure.

[0033] Figure 2 is a cross-sectional view of a soft-pack type battery cell according to an embodiment of the present disclosure.

[0034] Figure 3 is a cross-sectional view of a soft-pack type battery cell according to another embodiment of the present disclosure.

[0035] Figure 4 is an enlarged cross-sectional view illustrating a folded portion of a pouch-type battery cell according to still another embodiment of the present disclosure.

[0036] Figure 5 is a cross-sectional view of a soft-pack type battery cell according to a comparative example; and

[0037] Figure 6 is a flow chart of a method for manufacturing a soft-pack type battery cell according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION

[0038] Hereinafter, the preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. However, the present disclosure can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein.

[0039] In order to clearly describe the present disclosure, parts that are irrelevant to the description or detailed description of related well-known technologies that may unnecessarily obscure the subject matter of the present disclosure will be excluded. Throughout the specification, the same reference numerals denote the same elements.

[0040] Furthermore, the terms or words used in the specification and claims should not be restrictively interpreted as ordinary meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the present disclosure based on the principle that the inventor can appropriately define the concepts of the terms, thereby describing and interpreting the invention in the best manner.

[0041] Figure 1 is a perspective view showing a case and an electrode assembly of a pouch-type battery cell according to an embodiment of the present disclosure. Figure 2 is a cross-sectional view of a soft-pack type battery cell according to an embodiment of the present disclosure.

[0042] The soft pack type battery cell 10 according to an embodiment of the present disclosure may include a pair of cases 100 and an electrode assembly 200 accommodated between the pair of cases 100. More specifically, the pair of cases 100 may be sealed in a state where the electrode assembly 200 and the electrolyte are accommodated together to constitute the soft pack type battery cell 10.

[0043] The electrode assembly 200 may include a positive electrode, a negative electrode, and a separator interposed between the positive electrode and the negative electrode to insulate the positive electrode and the negative electrode from each other. The type of the electrode assembly 200 is not limited. As an example, the electrode assembly 200 may be a stacked electrode assembly in which the positive electrode and the negative electrode are alternately stacked and the separator is located between the positive electrode and the negative electrode. As another example, the electrode assembly 200 may be a wound electrode assembly in which the sheet-shaped positive electrode and the negative electrode are wound together and the separator is located between the positive electrode and the negative electrode.

[0044] The pair of cases 100 may provide an accommodation space capable of accommodating the electrode assembly 200 and may be in a soft-pack shape as a whole.

[0045] The pair of housings 100 may be connected to each other at one side, and the connected portions may constitute the folding portion 103. That is, the pair of housings 100 may be connected as one body through the folding portion 103. However, the embodiments of the present disclosure are not limited thereto, and the pair of housings 100 may be provided as separate members separated from each other.

[0046] Each case 100 may include a first resin layer 101, a second resin layer 102, and a metal layer 103. That is, the case 100 may be manufactured by molding a laminate film including the first resin layer 101, the second resin layer 102, and the metal layer 103.

[0047] The first resin layer 101 may constitute the innermost layer of the housing 100 .

[0048] The first resin layer 101 disposed in the cup portion 110 of each of the pair of shells 100 may be in direct contact with or adjacent to each of the electrode assembly 200 and the electrode liquid. Therefore, the first resin layer 101 may have high insulation and corrosion resistance. For example, the first resin layer 101 may include a polypropylene (PP) material. However, the embodiments of the present disclosure are not limited thereto, and a person of ordinary skill in the art may appropriately select the material of the first resin layer 101.

[0049] The first resin layers 101 respectively disposed at the edges 120 of the pair of housings 100 may be sealed with each other to provide an insulating sealing portion 140. The insulating sealing portion 140 will be described in detail later.

[0050] The second resin layer 102 may constitute the outermost layer of the housing 100. The second resin layer 102 may electrically insulate the electrode assembly 200 from the outside and protect the soft-pack type battery cell 10 from friction and collision with the outside. For example, the second resin layer 102 may include a polyethylene terephthalate (PET) material. However, the embodiments of the present disclosure are not limited thereto, and a person of ordinary skill in the art may appropriately select the material of the second resin layer 102.

[0051] The metal layer 103 may be stacked between the first resin layer 101 and the second resin layer 102. The metal layer 103 may ensure the mechanical strength of the case 100, block entry of external gas, moisture, etc., and prevent leakage of the electrolyte.

[0052] The metal layer 103 may include a stainless steel (STS) material. Since the melting point of stainless steel is about 1400° C., the stainless steel may have high heat resistance compared to aluminum (Al) used in a pouch type battery cell according to the related art.

[0053] The metal layers 103 respectively provided at the edges 120 of the pair of housings 100 may be sealed with each other to provide a metal sealing portion 150. The metal sealing portion 150 will be described in detail later.

[0054] A cup portion 110 accommodating the electrode assembly 200 may be provided in at least one of the pair of cases 100. The cup portion 110 may be recessed and molded in a laminate film as a base material of the case 100.

[0055] In this embodiment, the cup portion 110 may be provided in each of the pair of cases 100. The pair of cup portions 110 may communicate with each other to provide an accommodation space for accommodating the electrode assembly 200.

[0056] Each of the pair of cases 100 may include an edge 120 disposed at the periphery of the cup portion 110. The edge 120 may be referred to as a platform portion. The edges 120 of the pair of cases 100 may be sealed to each other in a state of contacting each other, so that the electrode assembly 200 may be sealed in the pair of cases 100.

[0057] In one example, when a pair of housings 100 are provided as one body, the folded portion 103 may be folded so that the edges 120 of the pair of housings 100 contact each other. In this case, the edges 120 contacting each other may constitute three sides of the soft-pack type battery cell 10, and the folded portion 103 may constitute the remaining one side. Therefore, in the soft-pack type battery cell 10, the sealing parts 140 and 150 may be provided on three sides.

[0058] As another example, when the pair of housings 100 are separated from each other, the edges 120 of the pair of housings 100 may be arranged to contact each other. In this case, the edges 120 contacting each other may constitute four sides of the soft-pack type battery cell 10. In the soft-pack type battery cell 10, the sealing parts 140 and 150 may be arranged on the four sides.

[0059] The pouch type battery cell 10 may include a folded portion 130 at which an edge 120 of one case 100A of the pair of cases 100 is folded to surround an edge 120 of the other case 100B.

[0060] More specifically, the edge 120 of one housing 100A may be processed to curl along the end of the edge 120 of the other housing 100B. To this end, the edge 120 of one housing 100A may be wider than the edge 120 of the other housing 100B. More specifically, the edge 120 of one housing 100A may be longer than the edge 120 of the other housing 100B in the full length and full width directions.

[0061] Figure 1 The first line L1 and the second line L2 shown in FIG. 1 are shown as examples of lines to be folded in the curling process. The first line L1 may be parallel to the full length direction of the soft-pack type battery cell 10, and the second line L2 may be parallel to the full width direction of the soft-pack type battery cell 10. Each of the first line L1 and the second line L2 may correspond to an end of the edge 120 of the other housing 100B.

[0062] The first line L1 and the second line L2 may be folded sequentially or in reverse order. At the edge 120 of one housing 100A, the corner where the first line L1 and the second line L2 overlap each other may be double folded. However, the embodiments of the present disclosure are not limited thereto, and a person of ordinary skill in the art may cut the corner into an appropriate shape.

[0063] The pouch type battery cell 10 may include an insulating sealing part 140 and a metal sealing part 150 .

[0064] The insulating seal portion 140 may be formed by sealing the first resin layers 101 of the pair of housings 100 to each other. More specifically, the first resin layers 101 of the edges 120 of the pair of housings 100 may be thermally welded to each other to provide the insulating seal portion 140 .

[0065] The insulating sealing portion 140 may be disposed inwardly from the folded portion 130 or overlap a portion of the inner portion of the folded portion 130 .

[0066] The insulating sealing part 140 may be provided to be elongated along the edge 120 of each of the pair of housings 100. The insulating sealing part 140 may be connected to the first resin layer 101 in the cup part 110. Therefore, the electrode assembly 200 and the electrolyte in the cup part 110 may be sealed by the insulating sealing part 140 to be in an insulating state.

[0067] The metal sealing portion 150 may be formed by sealing the metal layers 103 of the pair of housings 100 to each other. More specifically, the metal layers 103 of the edges 120 of the pair of housings 100 may be welded to each other to provide the metal sealing portion 150 .

[0068] The metal sealing part 150 may be disposed to be elongated along the folded part 130. The metal sealing part 150 may be disposed outside the insulating sealing part 140.

[0069] Since the metal layers 103 are welded to each other, the sealing strength of the metal sealing part 150 may be higher than the sealing strength of the insulating sealing part 140 where the first resin layers 101 are welded to each other. Therefore, the sealing strength of the pouch type battery cell 10 may be significantly increased.

[0070] The metal sealing part 150 may be provided at the folded part 130. The metal sealing part 150 may be formed by welding the metal layers 103 of the folded part 130 to each other by laser in a state where the folded part 130 is formed. Therefore, the metal sealing part 150 may be doubly sealed.

[0071] The laser beam for forming the metal sealing part 150 may be irradiated to one side of the folded part 130 , and the irradiation direction is not limited. For example, the laser beam may be irradiated from above or below the folded part 130 .

[0072] More specifically, the metal sealing portion 150 may include a first metal sealing portion 151 and a second metal sealing portion 152, wherein at the first metal sealing portion 151, one surface (e.g., the top surface) of the metal layer 103 of another shell 100B is sealed with the metal layer 103 of one shell 100A, and at the second metal sealing portion 152, another surface (e.g., the bottom surface) of the metal layer 103 of another shell 100B is sealed with the metal layer 103 of one shell 100A.

[0073] Since the metal seal 150 is doubly formed at the folded portion 130 as described above, the sealing strength of the soft pack type battery cell 10 can be further increased. In addition, when compared with the case where the folded portion 130 is not formed, there is an advantage that the ratio of the gap between the metal layers 103 to the thickness of the folded portion 130 can be reduced, thereby improving the quality of laser welding.

[0074] The first resin layer 101 and the second resin layer 102 may be removed from the metal sealing part 150 .

[0075] More specifically, each edge 120 constituting the folding portion 130 of the pair of housings 100 may include an exposed area in which the first resin layer 101 and the second resin layer 102 are removed and the metal layer 103 is exposed to each of the inside and the outside. The folding portion 130 may be configured so that the exposed area of ​​one housing 100A is folded to surround the exposed area of ​​the other housing 100B. That is, the folding portion 130 may be configured so that the metal layer 103 of one housing 100A is folded to surround the metal layer 103 of the other housing 100B.

[0076] Therefore, the first resin layer 101 and the second resin layer 102 can prevent the sealing quality and strength of the metal sealing part 150 from being reduced.

[0077] Figure 3 is a cross-sectional view of a soft-pack type battery cell according to another embodiment of the present disclosure.

[0078] Hereinafter, contents overlapping with the above-described embodiment will be omitted and the description will be focused on the differences.

[0079] In the soft-pack type battery cell 10 according to another embodiment of the present disclosure, the cup portion 110 may not be provided in one of the pair of housings 100. For example, the cup portion may not be provided in one housing 100A, and the cup portion 110 may be provided in the other housing 100B. In this case, the edge 120 of one housing 100A may be provided at the periphery of a portion of the cup portion 110 facing the other housing 100B.

[0080] As described above, the edge 120 of one housing 100A may be folded to surround the edge 120 of the other housing 100B to form the folded portion 130. However, the embodiments of the present disclosure are not limited thereto, and the edge 120 of the other housing 100B may also be folded to surround the edge 120 of one housing 100A to form the folded portion 130.

[0081] In addition, first resin layers 101 of edges 120 of a pair of housings 100 may be heat-fused to each other to provide insulating seal 140, and metal layers 103 of folded portion 130 may be welded to each other to provide metal seal 150. The above applies to seals 140 and 150.

[0082] Figure 4 is an enlarged cross-sectional view illustrating a folded portion of a pouch-type battery cell according to still another embodiment of the present disclosure.

[0083] Hereinafter, contents overlapping with the above-described embodiment will be omitted and the description will be focused on the differences.

[0084] In the soft-pack type battery cell 10 according to another embodiment of the present disclosure, the second resin layer 102 may be removed from any one of the two outer surfaces of the folded portion 130. Preferably, the second resin layer 102 may be removed from one of the two outer surfaces of the folded portion 130 including the end of one housing 100A ( Figure 4 The second resin layer 102 is removed on the top surface of the Figure 4 That is, the difference is that in the above-mentioned embodiment, the second resin layer 102 is removed from each of the two outer surfaces of the folded portion 130, while in this embodiment, the second resin layer 102 is included in any one of the two outer surfaces of the folded portion 130.

[0085] The laser beam forming the metal seal 150 may be irradiated onto one of the two outer surfaces of the folded portion 130 from which the second resin layer 102 is removed. Therefore, the metal layers 103 of the folded portion 130 may be welded to each other, minimizing damage to the second resin layer 102 during the formation of the metal seal 150.

[0086] Figure 5 It is a cross-sectional view of a pouch-type battery cell according to a comparative example.

[0087] The pouch type battery cell 10 ′ according to the comparative example may include an insulating sealing portion 140 on which the first resin layers 101 of the edges 120 of a pair of cases 100 are thermally welded to each other, and does not include a metal sealing portion 150 where the metal layers 103 are welded to each other.

[0088] Since the insulating seal 140 is formed by thermally fusing the first resin layers 101 to each other, the insulating seal 140 may be weak against high temperatures. For example, when the first resin layer 101 includes a polypropylene (PP) material, the insulating seal 140 may melt at a temperature of about 150°C. Therefore, when the temperature exceeds the critical temperature due to abnormal heating of the electrode assembly 200, etc., the temperature quickly rises to about 1000°C or more. Therefore, there is a problem that the sealing of the soft-pack type battery cell 10' may be damaged.

[0089] On the other hand, in the soft-pack type battery cell 10 according to the present disclosure, the folding portion 130 may include a double-sealed metal sealing portion 150 so that the sealing of the soft-pack type battery cell 10 can be maintained even when the insulating sealing portion 140 is melted. In addition, the sealing strength of the metal sealing portion 150 may be higher than the sealing strength of the insulating sealing portion 140.

[0090] In particular, when the metal layer 103 constituting the metal seal 150 includes a stainless steel (STS) material, the metal seal 150 does not melt and can maintain sealing until a temperature of about 1400° C. Therefore, the occurrence of heat propagation (TP) to other battery cells around the pouch-type battery cell 10 can be prevented or substantially delayed.

[0091] Figure 6 is a flow chart of a method for manufacturing a soft-pack type battery cell according to yet another embodiment of the present disclosure.

[0092] A method for manufacturing a soft-pack type battery cell according to yet another embodiment of the present disclosure may be the method for manufacturing the soft-pack type battery cell 10 described above.

[0093] The manufacturing method of a soft-pack type battery cell may include: housing the electrode assembly 200 in a cup portion 110 formed in at least one of a pair of shells 100 (S10) (hereinafter referred to as the "housing process"), sealing the first resin layers 101 of the pair of shells 100 to each other (S20) (hereinafter referred to as the "insulating sealing process"), forming a folding portion 130 by folding the edge 120 of one shell 100A of the pair of shells 100 so that the edge 120 surrounds the edge 120 of the other shell 100B (S30) (hereinafter referred to as the "processing process"), and sealing the metal layers 103 to each other at the folding portion 130 (S40) (hereinafter referred to as the "metal sealing process").

[0094] In the accommodation process ( S10 ), the edges 120 of the pair of cases 100 may contact each other in a state where the electrode assembly 200 is accommodated in the cup portion 110 . Therefore, the electrode assembly 200 may be accommodated between the pair of cases 100 .

[0095] In the insulation sealing process ( S20 ), the first resin layers 101 of the edges 120 of the pair of housings 100 may be thermally welded to each other to form an insulation sealing portion 140 .

[0096] In the processing step (S30), the exposed area of ​​one housing 100A may be folded to surround the exposed area of ​​the other housing 100B. The exposed area may refer to an area where the first resin layer 101 is removed from the edge 120 of each housing 100 and the metal layer 103 is exposed to the inside. Alternatively, the second resin layer 102 may be removed and the second metal layer 103 may be exposed to the outside in at least a portion of the exposed area.

[0097] In addition, when the corner of the edge 120 of one housing 100A is double-folded, the processing step (S30) may include a step of pressing the double-folded corner. Therefore, it is possible to prevent the thickness of the corner from being unnecessarily increased.

[0098] In the metal sealing process (S40), the metal layers 103 of the folded portion 130 are welded to each other by laser to form the metal sealing portion 150. More specifically, the laser may be irradiated to one of the two outer surfaces of the folded portion 130 from which the second resin layer 102 is removed.

[0099] The metal sealing portion 150 may include a first metal sealing portion 151 and a second metal sealing portion 152, wherein at the first metal sealing portion 151, one surface (e.g., the top surface) of the metal layer 103 of another shell 100B is sealed with the metal layer 103 of one shell 100A, and at the second metal sealing portion 152, another surface (e.g., the bottom surface) of the metal layer 103 of another shell 100B is sealed with the metal layer 103 of one shell 100A.

[0100] The processing step (S30) and the metal sealing step (S40) may be performed sequentially. However, the order of performing the insulation sealing step (S20) may be changed as needed.

[0101] In one example, if Figure 6 As shown, the insulating sealing process (S20), the processing process (S30) and the metal sealing process (S40) may be performed sequentially.

[0102] In another example, the insulation sealing process ( S20 ) may be performed after the processing process ( S30 ) and the metal sealing process ( S40 ).

[0103] In yet another example, the insulation sealing process ( S20 ) may be performed between the processing process ( S30 ) and the metal sealing process ( S40 ).

[0104] The description of the present disclosure is intended to be illustrative, and various changes and modifications may be made by one of ordinary skill in the art to which the present disclosure pertains without departing from the spirit and scope of the present disclosure as defined by the appended claims.

[0105] Therefore, the embodiments described herein are used to describe rather than limit the technical spirit of the present disclosure. The scope of the technical spirit of the present disclosure is not limited by the embodiments.

[0106] Furthermore, the protection scope of the present disclosure should be determined by reasonable interpretation of the appended claims, and all technical concepts falling within the equivalent scope of the present application should be interpreted as being within the right scope of the present application.

[0107] [Explanation of Reference Numerals]

[0108] 10: Soft-pack battery cell 100: Shell

[0109] 101: first resin layer 102: second resin layer

[0110] 103: Metal layer 110: Cup part

[0111] 120: edge 130: folded part

[0112] 140: Insulation seal 150: Metal seal

[0113] 151: first metal sealing part 152: second metal sealing part

[0114] 200: Electrode assembly

Claims

1. A soft-pack type battery cell, in which an electrode assembly is accommodated between a pair of casings, Each of the pair of housings includes a first resin layer constituting an innermost layer, a second resin layer constituting an outermost layer, and a metal layer laminated between the first resin layer and the second resin layer, The soft-pack battery cell comprises: a cup portion disposed in at least one of the pair of housings and configured to accommodate the electrode assembly; an insulating sealing portion at which the first resin layers of the pair of housings are sealed to each other; a folded portion folded so that an edge of one shell of the pair of shells surrounds an edge of the other shell; and a metal sealing portion provided at the folded portion and at which the metal layers of the pair of housings are sealed to each other.

2. The soft-pack type battery cell according to claim 1, wherein: The metal sealing portion is provided at an outer side than the insulating sealing portion.

3. The soft-pack type battery cell according to claim 1, wherein: The metal sealing portion comprises: a first metal sealing portion at which one surface of the metal layer of the other housing is sealed with the metal layer of the one housing; and A second metal sealing portion at which the other surface of the metal layer of the other housing is sealed with the metal layer of the one housing.

4. The soft-pack type battery cell according to claim 1, wherein: The first resin layer and the second resin layer are removed from the metal seal portion.

5. The soft-pack type battery cell according to claim 1, wherein: removing the first resin layer from the metal seal portion, and The second resin layer is removed from either one of the two outer surfaces of the folded portion.

6. The soft-pack type battery cell according to claim 1, wherein: The metal layer includes stainless steel material.

7. A method for manufacturing a soft-pack type battery cell, in which an electrode assembly is accommodated between a pair of shells, each of the pair of shells includes an innermost first resin layer, an outermost second resin layer, and a metal layer stacked between the first resin layer and the second resin layer, the method comprising: housing the electrode assembly in a cup formed in at least one of the pair of cases; sealing the first resin layers of the pair of housings to each other; forming a folded portion by folding an edge of one of the pair of shells so that the edge surrounds an edge of the other shell; as well as The metal layers are sealed to each other at the folded portion.

8. The method according to claim 7, wherein: When the first resin layers are sealed to each other, the first resin layers are thermally fused to each other, and When the metal layers are sealed to each other, the metal layers are welded to each other by laser.

9. The method according to claim 7, wherein: An edge of each of the pair of housings includes an exposed area in which the first resin layer is removed and the metal layer is exposed to the inside, Wherein, when the folded portion is formed, the exposed area of ​​the one shell surrounds the exposed area of ​​the other shell.

10. The method according to claim 7, wherein: When the metal layers are sealed to each other, the laser is irradiated onto one of the two outer surfaces of the folded portion from which the second resin layer is removed.

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