Secondary battery

Abstract

The present invention relates to a secondary battery, comprising: an electrode assembly; an exterior film having an internal space which accommodates the electrode assembly and an exterior opening which enables communication between the internal space and the outside; and a cover member covering the exterior opening of the exterior film. The cover member may comprise a first member blocking the exterior opening and a second member extending from the first member and coupled to the inner surface of the exterior film.

Description

secondary battery

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0071156, filed June 1, 2023, and Korean Patent Application No. 10-2024-0071969, filed May 31, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a secondary battery.

[0005] Generally, secondary batteries, unlike non-rechargeable primary batteries, are rechargeable and dischargeable. They are widely used in electronic devices such as mobile phones, laptops, and camcorders, as well as electric vehicles. In particular, lithium secondary batteries have a higher capacity than nickel-cadmium or nickel-hydrogen batteries and, due to their high energy density, are rapidly increasing in use.

[0006] Secondary batteries can be classified into cylindrical or prismatic batteries in which the electrode assembly is built into a cylindrical or prismatic metal can, and pouch-type batteries in which the electrode assembly is built into a pouch-type case of a laminate sheet, depending on the shape of the battery case.

[0007] Fig. 1 is a drawing illustrating an example of a pouch-type secondary battery. The pouch-type secondary battery (1, pouch-type cell) includes an electrode assembly (2) formed by alternately stacking electrodes and separators, and an outer film (20) in which the electrode assembly (2) is accommodated. Electrode tabs (15) may be connected to the electrodes of the electrode assembly (2), respectively. The electrode tabs (15) may be welded to each other in a predetermined region and then connected to an electrode lead (17) by welding. The outer film (20) includes a receiving portion (21; cup portion) for accommodating the electrode assembly (2). The receiving portion (21) of the outer film (20) may be formed by one or two concave-shaped portions. Fig. 1 illustrates an example of a receiving portion (21) formed by two concave-shaped portions. Such an outer film (20) may be manufactured by molding a pouch film. A sealing portion (23, terrace) is formed around the perimeter of the receiving portion (21) by sealing.

[0008] Meanwhile, the molding depth of the cup portion formed into the pouch film is limited due to the material properties of the pouch film. Consequently, it is difficult to form the cup portion deep enough to increase battery capacity, and the material and thickness of the pouch film must be selected within certain limits. As the thickness of the pouch film decreases during the molding process, defects such as cracks can easily occur in the outer packaging material. Furthermore, the outer packaging material typically includes a pocket portion to capture gases generated during activation. However, this pocket portion is removed after the gas is discharged through the degassing process. This leads to the problem that a portion of the outer packaging material is always discarded.

[0009] The object of the present invention is to provide a secondary battery capable of solving various problems that arise during the process of forming a cup portion for accommodating an electrode assembly.

[0010] In addition, the object of the present invention is to provide a secondary battery capable of preventing disposal of an outer material generated after a degassing process.

[0011] In one example, a secondary battery includes an electrode assembly, an outer film having an internal space for accommodating the electrode assembly, an outer film having an outer opening for communicating the internal space with the outside, and a cover member for covering the outer opening of the outer film, wherein the cover member may include a first member for blocking the outer opening, and a second member extending from the first member and coupled to an inner surface of the outer film.

[0012] In another example, the outer film may have a shape in which a predetermined sheet having a first end and a second end spaced apart from the first end in a predetermined direction is rolled or folded so that the first end and the second end meet each other.

[0013] In another example, the inner surface of the first end may be bonded to the inner surface or outer surface of the second end by adhesion or fusion.

[0014] In another example, the second member may be formed along the edge of the first member, and may extend in a direction facing the internal space from the first member.

[0015] In another example, the cover member may further include a third member formed along the edge of the first member, and forming an insertion space together with the second member into which a terminal portion of the outer film adjacent to the outer material opening is inserted.

[0016] In another example, the third member, together with the second member, may form a C-shaped cross-section opening toward the outer film.

[0017] In another example, the second member may have a length that contacts the electrode assembly within the outer film.

[0018] In another example, the second member may be formed along the edge of the first member, and may extend from the first member in a direction facing the outside.

[0019] In another example, the cover member may further include a third member formed along the edge of the second member at the end of the outer side of the second member, and forming an insertion space together with the second member into which an end portion of the outer film adjacent to the outer material opening is inserted.

[0020] In another example, the third member, together with the second member, may form a C-shaped cross-section opening toward the outer film.

[0021] In another example, the first member may have a through hole through which an electrode lead electrically connected to the electrode assembly passes.

[0022] In another example, the first member may have an electrolyte injection hole for injecting an electrolyte into the internal space of the outer film.

[0023] In another example, the second member may be arranged to support a portion of the outer film that is joined to the second member while being supported by the first member when joined to the inner surface of the outer film.

[0024] According to the present invention, since an outer film can be prepared without forming a cup portion for accommodating an electrode assembly, the battery capacity can be easily increased by increasing the size of the outer film, the material and thickness of the outer sheet for manufacturing the outer film can be selected relatively freely, and defects such as cracks can be prevented from easily occurring.

[0025] In addition, according to the present invention, electrolyte injection and degassing can be performed through the electrolyte injection hole of the cover member, thereby preventing unnecessary disposal of the outer material.

[0026] Furthermore, according to the present invention, since the cover member has a space for inserting the end portion of the outer film, the bonding force between the outer film and the cover member can be increased.

[0027] Figure 1 is a drawing illustrating an example of a pouch-type secondary battery.

[0028] Figure 2 is a perspective view illustrating a secondary battery according to Example 1 of the present invention.

[0029] Figure 3 is an exploded perspective view of the secondary battery of Figure 2.

[0030] Fig. 4 is a cross-sectional view showing a modified example of the outer film of Fig. 2.

[0031] Figure 5 is a cross-sectional view along line AA of the secondary battery of Figure 2.

[0032] Figure 6 is a perspective view illustrating a secondary battery according to Example 2 of the present invention.

[0033] Figure 7 is an exploded perspective view of the secondary battery of Figure 6.

[0034] Fig. 8 is a cross-sectional view along line BB of the secondary battery of Fig. 6.

[0035] Fig. 9 is a perspective view illustrating a modified example of the secondary battery of Fig. 6.

[0036] Figure 10 is an exploded perspective view of the secondary battery of Figure 9.

[0037] Fig. 11 is a cross-sectional view along line CC of the secondary battery of Fig. 9.

[0038] Fig. 12 is a perspective view illustrating a secondary battery according to Example 3 of the present invention.

[0039] Figure 13 is an exploded perspective view of the secondary battery of Figure 12.

[0040] Fig. 14 is a cross-sectional view along line DD of the secondary battery of Fig. 12.

[0041] Fig. 15 is a perspective view illustrating a modified example of the secondary battery of Fig. 12.

[0042] Figure 16 is an exploded perspective view of the secondary battery of Figure 15.

[0043] Fig. 17 is a cross-sectional view along line EE of the secondary battery of Fig. 15.

[0044] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be implemented in various different forms and is not limited or restricted by the following examples.

[0045] In order to clearly explain the present invention, a detailed description of a part that is irrelevant to the description or a related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and when adding reference signs to components of each drawing in this specification, the same or similar reference signs are attached to the same or similar components throughout the specification.

[0046] In addition, terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0047] Example 1

[0048] FIG. 2 is a perspective view illustrating a secondary battery (100) according to Embodiment 1 of the present invention, and FIG. 3 is an exploded perspective view of the secondary battery (100) of FIG. 2. The secondary battery (100) according to Embodiment 1 of the present invention may include an electrode assembly (110), an outer film (130), and a cover member (150), as illustrated in FIGS. 2 and 3. Hereinafter, the secondary battery (100) of the present embodiment will be described in detail with reference to FIG. 3. For reference, the contents of Embodiment 1 may be equally applied to the embodiments described later, as long as they do not conflict with each other.

[0049] Electrode assembly (110)

[0050] The electrode assembly (110) may be formed by alternately stacking electrodes and separators. The electrodes may include a positive electrode and a negative electrode. The electrode assembly (110) may have electrode tabs (111) connected to the electrodes. The electrode tabs (111) may be provided separately or may be provided as part of a current collector constituting the electrode. The electrode tabs (111) may be welded to each other in a predetermined area and then electrically connected to an electrode terminal (157) described below.

[0051] Exterior film (130)

[0052] The outer film (130) can form an internal space (131) that accommodates the electrode assembly (110). The outer film (130) can form an external opening (132) that connects the internal space (131) to the outside of the outer film (130). The external opening (132) can be provided at each of the longitudinal ends of the outer film (130). The external opening (132) can be sealed by a cover member (150) that will be described later.

[0053] The outer film (130) can be obtained from a sheet-shaped outer material sheet (130a). The outer material sheet (130a) can be a sheet having a first end (135) and a second end (136) spaced apart from the first end (135) in a predetermined direction. When such a sheet (130a) is rolled or folded so that the first end (135) and the second end (136) meet, the outer film (130) can be obtained. At this time, the first end (135) and the second end (136) can be joined to each other. An adhesive or heat sealing can be used for the joining. At this time, the inner surface of the first end (135) can be bonded to the outer surface of the second end (136), as illustrated in FIG. 3. Alternatively, as illustrated in Fig. 4, the inner surface of the first end (135') may be joined to the inner surface of the second end (136'). Fig. 4 is a cross-sectional view illustrating a modified example of the outer film (130') of Fig. 2. The joint portion of the first end (135') and the second end (136') may be folded in the direction of the arrow in Fig. 4. This can reduce the space occupied by the outer film (130').

[0054] The outer sheet (130a) may be a sheet including a metal layer such as aluminum or stainless steel. The outer sheet (130a) may be a laminate sheet further including a resin layer laminated on the metal layer. The outer sheet (130a) may include a first resin layer disposed on the inner surface of the metal layer. The first resin layer may be a layer formed of polypropylene (PP). The first resin layer may require high insulation and corrosion resistance, and the first resin layer may be formed of another resin that satisfies such requirements. The outer sheet (130a) may include a second resin layer disposed on the outer surface of the metal layer. The second resin layer may be a layer formed of polyethylene terephthalate (PET). The second resin layer may need to protect the secondary battery (100) while electrically insulating the secondary battery (100), and the second resin layer may be formed of another resin that satisfies such requirements.

[0055] Cover member (150)

[0056] The cover member (150) may be a member that covers the outer material opening (132) of the outer film (130), as illustrated in FIGS. 2 and 3. In order to prevent leakage of the electrolyte filling the internal space (131) of the outer film (130), the cover member (150) may seal the outer material opening (132) of the outer film (130). The cover member (150) may seal the outer film (130) simply by being bonded to the outer film (130), or may seal the outer film (130) by providing a sealant layer (not illustrated) between the cover member and the outer film (130).

[0057] The cover member (150) may include a first member (151) that blocks the outer material opening (132) as illustrated in FIGS. 3 and 5. FIG. 5 is a cross-sectional view taken along line AA of the secondary battery of FIG. 2. The first member (151) may be formed to block the outer material opening (132) entirely, either alone or together with a gasket member (156) to be described later. To this end, the first member (151) may be formed to correspond to the shape of the outer material opening (132). FIG. 3 illustrates a first member (151) formed in a square shape (the shape of the outer material opening).

[0058] The first member (151) may be obtained from a material that is not easily permeable to moisture in order to seal the internal space (131) of the outer film (130). For example, the first member (151) may be obtained from metal or resin, or from a laminate sheet including a metal layer. The same may be true for the second member (152) described below.

[0059] The cover member (150) may include a second member (152) extending from the first member (151). The second member (152) may be formed integrally with the first member (151), or may be formed as a separate body and then joined to the first member (151). The first member (151) and the second member (152) may form a cap member blocking the exterior opening (132).

[0060] The second member (152) may be sealed and bonded to the inner surface of the outer film (130). An adhesive, heat fusion, or welding may be used for this bonding. For example, a bonding by heat fusion may be realized between the resin layer provided on the outer surface of the second member (152) and the resin layer provided on the inner surface of the outer film (130). However, when a gasket member (156) is provided as shown in FIG. 5, the second member (152) may be bonded to the outer film (130) via the gasket member (156).

[0061] Conventionally, a pouch-shaped outer packaging material was manufactured by forming a cup portion on a pouch film and sealing the cup portion with another pouch film. However, the molding depth of the cup portion was limited by the material properties of the pouch film, making it difficult to form the cup portion deeply enough to increase battery capacity. Furthermore, the material and thickness of the pouch film had to be selected within certain limits. Furthermore, as the thickness of the pouch film decreased during the molding process, defects such as cracks were likely to occur in the pouch-shaped outer packaging material.

[0062] In contrast, in the case of the secondary battery (100) of the present embodiment, since the electrode assembly (110) can be inserted into the outer film (130) through the outer material opening (132) after the outer film (130) is prepared without forming the cup portion, the above limitations or defects do not occur, so the battery capacity can be easily increased by increasing the size of the outer film (130), the material and thickness of the outer material sheet (130a) can be selected relatively freely, and defects such as cracks can not easily occur. For reference, in the case where the outer film (130) is prepared by rolling or folding the outer material sheet (130a), the electrode assembly (110) can be positioned on the upper surface of the outer material sheet (130a) in the unfolded state, and in this case, the outer film (130) can be prepared without forming the cup portion.

[0063] Meanwhile, as illustrated in FIGS. 3 and 5, the cover member (150) may include a gasket member (156). The gasket member (156) may prevent leakage of electrolyte between the outer film (130) and the cover member (150). The gasket member (156) may also serve as a medium for a firm bond between the outer film (130) and the cover member (150). As illustrated in FIG. 5, the gasket member (156) may be formed to surround both the inner and outer surfaces of the second member (152). Alternatively, the gasket member (156) may be formed in the shape of a picture frame to surround only the outer surface of the second member (152).

[0064] The cover member (150) may include an electrode terminal (157). The electrode terminal (157) is configured to electrically connect the secondary battery (100) to another device. The electrode terminal (157) is provided to penetrate the first member (151), and may be connected to the electrode tabs (111) at a portion exposed to the internal space (131) of the outer film (130). The electrode terminal (157) may be formed in an I-shape so as not to be easily detached from the first member (151).

[0065] The first member (151) may include an electrolyte injection hole (not shown) for injecting an electrolyte into the internal space (131) of the outer film (130). Through this, an electrolyte injection process and a post-activation degassing process can be performed. For example, when the secondary battery (100) is placed so that the first member (151) in which the electrolyte injection hole is provided faces upward, the electrolyte can be injected into the internal space (131) of the outer film (130) through the electrolyte injection hole. In the degassing process, the internal gas can be discharged through the open electrolyte injection hole. After the electrolyte injection and degassing, the electrolyte injection hole can be closed by sealing or welding. Alternatively, a valve that can be opened and closed can be installed in the electrolyte injection hole to open the electrolyte injection hole only when necessary.

[0066] In the past, a pouch-type outer packaging material had a storage portion for accommodating an electrode assembly and a pocket portion for accommodating gases generated during activation. After the gas in the pocket portion was discharged through a degassing process, the pocket portion was removed. This resulted in a problem in that some of the pouch-type outer packaging material was always discarded. However, the secondary battery (100) of the present embodiment can perform electrolyte injection and degassing through an electrolyte injection hole, so that such discarding of the outer packaging material may not occur.

[0067] Meanwhile, the secondary battery of the present embodiment is superior not only to conventional pouch-type batteries but also to square batteries. In the case of square batteries, if the volume expansion of the electrode assembly occurs during charging and discharging, the electrode assembly may be damaged due to the square metal can that hardly experiences shape change. In contrast, in the case of the secondary battery of the present embodiment, if the volume expansion of the electrode assembly occurs during charging and discharging, the shape of the outer film may change in response, i.e., the outer film may be stretched, so that damage to the electrode assembly may not occur.

[0068] Example 2

[0069] Fig. 6 is a perspective view illustrating a secondary battery (200) according to Embodiment 2 of the present invention, Fig. 7 is an exploded perspective view of the secondary battery (200) of Fig. 6, and Fig. 8 is a cross-sectional view along line BB of the secondary battery (200) of Fig. 6. The secondary battery (200) according to this embodiment has a difference in the cover member compared to the secondary battery (100) of Embodiment 1, and thus the following description will focus on this difference. For reference, the contents of Embodiment 2 can be equally applied to the above-described embodiment and the embodiment to be described below, as long as they do not conflict with each other.

[0070] The cover member (250) may include a first member (251) that blocks the space between the inner space (131) and the outer material opening (132), as illustrated in FIGS. 6 and 7. The first member (251) may be obtained from a material that is not easily permeable to moisture in order to seal the inner space (131) of the outer film (130). The same may be true for the second and third members (252, 255') described later.

[0071] The cover member (250) may include a second member (252) extending from the first member (251). The second member (252) may be bonded to the inner surface of the outer film (130). An adhesive, heat fusion, or welding may be used for this bonding. For example, a bonding by heat fusion may be implemented between a resin layer provided on the outer surface of the second member (252) and a resin layer provided on the inner surface of the outer film (130).

[0072] Meanwhile, as illustrated in FIG. 7, the first member (251) may include a through hole (253) through which an electrode lead (112) electrically connected to the electrode assembly (110) passes. This allows the electrode lead (112) to be easily exposed to the outside when the outer film (130) and the cover member (250) are combined. For example, in a state where the electrode assembly (110) is accommodated in the internal space (131) of the outer film (130), in the process of combining the cover member (250) to the outer material opening (132) of the outer film (130), the electrode lead (112) can be easily exposed to the outside by inserting it into the through hole (253) of the first member (251). For reference, in order to prevent leakage of electrolyte through the through hole (253), a sealant layer (not shown) may be provided between the outer surface of the electrode lead (112) and the inner surface of the through hole (253).

[0073] The first member (251) may include an electrolyte injection hole (not shown) for injecting an electrolyte into the internal space (131) of the outer film (130).

[0074] Meanwhile, the second member (252) may be arranged to support the joint portion of the outer film (130) with the second member (252) while being supported by the first member (251) when combined with the inner surface of the outer film (130).

[0075] This will be described with reference to Fig. 8. In order to bond the inner surface of the outer film (130) to the outer surface of the second member (252), it may be necessary to press the outer film (130) toward the second member (252). It may be necessary to support the second member (252) during this pressing. In the case of the secondary battery (200) of the present embodiment, even if the outer film (130) is pressed toward the second member (252), the first member (251) bonded to the second member (252) can support the second member (252), so the second member (252) can be supported during the pressing even without using a separate member for support. For this support, the first and second members (251, 252) can be made of a material having higher rigidity than the outer film (130).

[0076] Hereinafter, a specific structure of the cover member (250) will be described. The second member (252) of the cover member (250) may be formed along the edge of the first member (251) as illustrated in FIG. 8. In order to be firmly bonded to the outer film (130), the second member (252) may be formed along the entire edge of the first member (251), but it may also be considered to be formed on a portion of the edge. FIG. 7 illustrates an example of the second member (252) formed along the entire edge of the first member (251).

[0077] The second member (252) may extend from the first member (251) in a direction facing the internal space (131) (right direction in FIG. 8). The extension length of the second member (252) may be determined in consideration of the bonding strength with the outer film (130). For example, if a strong bond is required, the second member (252) may be formed long to increase the bonding area. In addition, the second member (252) may be set to a length that contacts the electrode assembly (110), as illustrated in FIG. 8. This may prevent the electrode assembly (110) from moving within the outer film (130).

[0078] The cover member (250') may be deformed as shown in FIGS. 9 to 11. FIG. 9 is a perspective view illustrating a modified example of the secondary battery of FIG. 6, FIG. 10 is an exploded perspective view of the secondary battery of FIG. 9, and FIG. 11 is a cross-sectional view along line CC of the secondary battery of FIG. 9.

[0079] The cover member (250') may include a third member (255') formed along the edge of the first member (251') as illustrated in FIG. 11. The third member (255') may be formed on the entire or a portion of the edge of the first member (251'). FIG. 10 illustrates the third member (255') formed on the entire edge of the first member (251').

[0080] The third member (255') may form a fitting space (S; see FIG. 10) together with the second member (252'). The fitting space (S) may be a space into which an end portion of the outer film (130) adjacent to the outer material opening (132) is fitted, as illustrated in FIG. 11. When the end portion of the outer film (130) is fitted into the fitting space (S), the bonding force between the outer film (130) and the cover member (250') may be increased. To further increase the bonding force, the fitting space (S) may be filled with an adhesive.

[0081] The third member (255') can form a C-shaped cross-section (opening to the right in FIG. 11) that opens toward the outer film (130) together with the second member (252') as illustrated in FIG. 11. In FIG. 11, the length of the second member (252') is illustrated to be longer than the length of the third member (255'). In this case, when the end portion of the outer film (130) is fitted into the fitting space (S), the end portion can be guided by the second member (252'), so that the end portion can be fitted more easily into the fitting space (S).

[0082] The third member (255') may include a vertical portion extending vertically from the first member (251') as illustrated in FIG. 11, and a horizontal portion extending horizontally from the vertical portion.

[0083] Meanwhile, the first member (251') of the present modified example may also be provided with the above-described through hole (253') and electrolyte injection hole (not shown).

[0084] Example 3

[0085] Fig. 12 is a perspective view illustrating a secondary battery (300) according to Embodiment 3 of the present invention, Fig. 13 is an exploded perspective view of the secondary battery (300) of Fig. 12, and Fig. 14 is a cross-sectional view along line DD of the secondary battery (300) of Fig. 12. The secondary battery (300) according to this embodiment has a difference in the cover member compared to the secondary battery (100) of Embodiment 1, and thus the following description will focus on this. For reference, the contents of Embodiment 3 can be equally applied to the aforementioned embodiments as long as they do not conflict with each other.

[0086] The cover member (350) of the present embodiment may include a first member (351) and a second member (352), as illustrated in FIG. 13. The first member (351) may be a member that blocks a space between the internal space (131) of the outer film (130) and the outer material opening (132). The second member (352) may be formed along the edge of the first member (351), and may extend from the first member (351) in a direction facing the outside of the outer film (130) (left direction in FIG. 14).

[0087] In order to bond the inner surface of the outer film (130) to the outer surface of the second member (352), it may be necessary to press the outer film (130) toward the second member (352). It may be necessary to support the second member (352) during this pressing. In the case of the secondary battery (300) of the present embodiment, the inner surface of the second member (352) is exposed to the outside of the cover member (350), so that a member for supporting the second member (352) can be easily positioned on the inner surface of the second member (352). As mentioned above, the second member (352) may also be supported by the first member (351).

[0088] The cover member (350') may be deformed as shown in FIGS. 15 to 17. FIG. 15 is a perspective view illustrating a modified example of the secondary battery of FIG. 12, FIG. 16 is an exploded perspective view of the secondary battery of FIG. 15, and FIG. 17 is a cross-sectional view along line EE of the secondary battery of FIG. 15.

[0089] The cover member (350') may include a third member (355') formed along the edge of the second member (352') at the end of the outer side of the second member (352') (the left end based on FIG. 17), as illustrated in FIG. 17. The third member (355') may form an insertion space (S; see FIG. 13) together with the second member (352'), into which an end portion adjacent to the outer material opening (132) of the outer film (130) is inserted. When the end portion of the outer film (130) is inserted into the insertion space (S), the bonding force between the outer film (130) and the cover member (350') may be increased. To further increase the bonding force, the insertion space (S) may be filled with an adhesive.

[0090] The third member (355') may form a C-shaped cross-section (opened to the right in FIG. 17) that opens toward the outer film (130) together with the second member (352') as illustrated in FIG. 17. In addition, the third member (355') may include a vertical portion extending vertically from the second member (351') and a horizontal portion extending horizontally from the vertical portion, as illustrated in FIG. 17.

[0091] The above description is merely an example of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention.

[0092] Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of ​​the present invention but to explain it, and the scope of the technical idea of ​​the present invention is not limited by these embodiments.

[0093] The scope of protection of the present invention should be interpreted by the claims below, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. Electrode assembly; An outer film having an inner space for accommodating the electrode assembly and an outer material opening for communicating the inner space with the outside; and Including a cover member that covers the outer material opening of the outer film, The above cover member, A first member blocking the opening of the exterior material; and A secondary battery comprising a second member extending from the first member and bonded to the inner surface of the outer film.

2. In claim 1, The above outer film, A secondary battery, wherein a predetermined sheet having a first end and a second end spaced apart from the first end in a predetermined direction has a shape in which the first end and the second end meet each other and are rolled or folded.

3. In claim 2, The inner surface of the first terminal above is, A secondary battery, which is bonded to the inner or outer surface of the second terminal by adhesion or fusion.

4. In claim 1, The second member above is, Formed along the border of the above first member, A secondary battery extending in the direction facing the internal space from the first member.

5. In claim 4, The above cover member, A secondary battery further comprising a third member formed along the edge of the first member, and forming an insertion space together with the second member into which a terminal portion of the outer film adjacent to the outer material opening is inserted.

6. In claim 5, The third absence is, A secondary battery, which forms a C-shaped cross-section opening toward the outer film, together with the second member.

7. In claim 4, A secondary battery, wherein the second member has a length that contacts the electrode assembly within the outer film.

8. In claim 1, The second member above is, Formed along the border of the above first member, A secondary battery extending in the direction facing the outside from the first member.

9. In claim 8, The above cover member, A secondary battery further comprising a third member formed along the edge of the second member at the end of the outer side of the second member, the third member forming an insertion space together with the second member into which an end portion of the outer film adjacent to the outer material opening is inserted.

10. In claim 9, The third absence is, A secondary battery, which forms a C-shaped cross-section opening toward the outer film, together with the second member.

11. In claim 1, The above first absence is, A secondary battery having a through hole through which an electrode lead electrically connected to the electrode assembly passes.

12. In claim 1, The above first absence is, A secondary battery having an electrolyte injection hole for injecting an electrolyte into the internal space of the outer film.

13. In claim 1, The second member above is, A secondary battery, wherein, when combined with the inner surface of the outer film, the portion of the outer film that is combined with the second member is supported by the first member.

Images