Battery cell

Abstract

This battery cell comprises: an electrode assembly in which a positive electrode, a negative electrode, and a separator are stacked and wound around an axis in a first direction; a can housing having an accommodation space in which the electrode assembly is accommodated and which has a housing opening formed in an upper side thereof; a sealing cover covering the housing opening so as to seal the accommodation space and electrically connected to the electrode assembly; and a fixing frame provided at an upper end of the can housing to fix the sealing cover by engaging with the sealing cover, and including a cover accommodation groove formed to accommodate a part of the sealing cover.

Description

battery cell

[0001] The present invention relates to a battery cell.

[0002] The present application claims the benefit of priority based on Korean Patent Application No. 10-2024-0175118 filed on November 29, 2024 and Korean Patent Application No. 10-2025-0133912 filed on September 17, 2025, and all contents described in the documents of said Korean patent applications are incorporated herein as part.

[0003] Unlike primary batteries, secondary batteries can be charged and discharged, allowing them to be applied in various fields such as digital cameras, mobile phones, laptops, hybrid cars, and electric vehicles. Examples of secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-hydrogen batteries, while lithium-ion batteries have recently become widely used.

[0004] Generally, a secondary battery (hereinafter referred to as a battery cell), including a lithium-ion battery, may have a structure in which an electrode assembly, in which one or more positive plates and one or more negative plates are alternately stacked with a separator in between, is housed inside a case.

[0005] When a cylindrical secondary battery explodes or ignites, side rupture may occur, where the side of the can housing is damaged. The beading formed in the can housing to secure the electrode assembly in the receiving space inside the cylindrical secondary battery may be one of the causes of side rupture.

[0006] FIG. 1 is a schematic diagram showing the configuration of a battery pack (2) including a battery cell (1) according to one embodiment.

[0007] Referring to FIG. 1, if damage occurs to the side of a cylindrical secondary battery (1), a problem may arise in which adjacent cylindrical secondary batteries (1) are damaged in a chain reaction. Additionally, a problem may arise in which the pack housing (3), which forms the outer shape of the battery pack (2) and accommodates the cylindrical secondary battery (1), is also damaged. Therefore, a battery cell structure is required that can prevent damage to the cylindrical secondary battery while maintaining the performance of the cylindrical secondary battery.

[0008] The present invention is designed to solve at least some of the problems of the prior art described above, and provides a stable battery cell that does not damage other adjacent components in the event of an explosion or ignition.

[0009] The present invention provides a battery cell comprising a fixed frame having a structure capable of stably accommodating a sealing cover.

[0010] A battery cell according to one embodiment includes an electrode assembly wound along a first direction axis in a stacked state with a positive electrode, a negative electrode, and a separator; a can housing having a housing opening formed on the upper side and a housing opening for receiving the electrode assembly; a sealing cover that covers the housing opening to seal the receiving space and is electrically connected to the electrode assembly; and a fixing frame having a cover receiving groove formed to receive a part of the sealing cover and provided at the upper end of the can housing to engage with the sealing cover to fix the sealing cover.

[0011] The sealing cover comprises a cover plate electrically connected to the electrode assembly and a plate coupling portion extending radially outward from the outer surface of the cover plate, wherein the plate coupling portion is a coupling protrusion protruding toward the cover receiving groove, and the outer surface of the coupling protrusion may have an inclined shape corresponding to the inner surface of the fixed frame.

[0012] The above fixed frame may further include a connecting rib that covers a portion of the upper surface of the connecting protrusion.

[0013] The above fixed frame can overlap the plate coupling part and the can housing in a second direction perpendicular to the first direction.

[0014] It further includes a current collector disposed between the electrode assembly and the fixed frame, and the lower end of the fixed frame can support the current collector.

[0015] The sealing cover above may be positioned so that the lower end of the plate coupling portion is spaced apart from the current collector.

[0016] The above plate coupling portion may include an elastic body that contracts when the sealing cover is coupled to the fixed frame by being pressed by the coupling rib.

[0017] The above coupling rib may further include an insertion guide surface having a shape inclined toward the inside of the receiving space to guide the movement of the sealing cover when the sealing cover is received in the fixed frame.

[0018] The inner surface of the fixed frame corresponding to the cover receiving groove may have a shape inclined toward the inside of the receiving space.

[0019] The above fixed frame can be combined with the can housing by fitting it into the housing opening of the can housing.

[0020] The above fixed frame may include an insulating material that electrically insulates the sealing cover and the can housing.

[0021] At least one area of ​​the upper portion of the fixed frame is exposed to the upper side of the can housing, and the outer surface of the can housing may form a plane identical to the outer surface of the exposed fixed frame.

[0022] According to the embodiments, a battery cell including a structure that can solve the problem of damage to the side of the can housing when an explosion and ignition occur inside the battery cell can be implemented.

[0023] The effects obtainable from the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art to which the present invention belongs from the description below.

[0024] FIG. 1 is a schematic diagram showing the configuration of a battery pack including a battery cell according to one embodiment.

[0025] FIG. 2 is a perspective view of a battery cell according to one embodiment.

[0026] FIG. 3 is a perspective view of a battery cell according to one embodiment.

[0027] Figure 4 is a cross-sectional view according to AA of Figure 3.

[0028] FIG. 5 is a diagram showing the disassembled view of a battery cell according to one embodiment.

[0029] Figure 6 is a drawing showing an enlarged view of part P of Figure 4.

[0030] FIG. 7 is a drawing showing a disassembled portion of a battery cell according to one embodiment.

[0031] FIG. 8 is a drawing illustrating a part of a battery cell according to one embodiment.

[0032] Prior to the detailed description of the present invention, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, they should be interpreted in a sense and concept consistent with the technical spirit of the present invention, based on the principle that the inventor may appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely the most preferred embodiments of the present invention and do not represent all aspects of the technical spirit of the present invention. Therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0033] Identical reference numbers or symbols in each drawing attached to this specification represent parts or components that perform substantially the same function. For convenience of explanation and understanding, the same reference numbers or symbols may be used to describe different embodiments. That is, even if components having the same reference number are depicted in multiple drawings, the multiple drawings do not all represent a single embodiment.

[0034] In the following description, singular expressions include plural expressions unless the context clearly indicates otherwise. Terms such as "comprising" or "constituting" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0035] In addition, it should be noted in advance that expressions such as upper side, top, lower side, bottom, side, front, and rear in the following description are based on the direction depicted in the drawings, and may be expressed differently if the direction of the object changes.

[0036] Additionally, in this specification and claims, terms including ordinal numbers, such as "first," "second," etc., may be used to distinguish between components. These ordinal numbers are used to distinguish identical or similar components from one another, and the meaning of the terms should not be limited by the use of such ordinal numbers. For example, the order of use or arrangement of components combined with such ordinal numbers should not be limited by the number. If necessary, each ordinal number may be used interchangeably.

[0037] Embodiments of the present invention will be described below with reference to the attached drawings. However, the scope of the present invention is not limited to the embodiments presented. For example, a person skilled in the art who understands the scope of the present invention may propose other embodiments that fall within the scope of the concept of the present invention by adding, changing, or deleting components, and such embodiments shall also be deemed to be within the scope of the concept of the present invention. In the drawings, the shapes and sizes of elements may be exaggerated for clearer explanation.

[0038] FIGS. 2 and FIGS. 3 are perspective views of a battery cell (1) according to one embodiment, FIG. 4 is a cross-sectional view taken along AA of FIG. 3, and FIG. 5 is a diagram showing a disassembled view of a battery cell (1) according to one embodiment.

[0039] Referring to FIGS. 2 to 5, the battery cell (1) may include an electrode assembly (20), a can housing (100), a sealing cover (200), and a fixed frame (300).

[0040] The first direction may refer to the central axis of the electrode assembly (20). The second direction may refer to a direction intersecting the first direction. The third direction may refer to a direction intersecting the first direction and the second direction. A plane including the second direction and the third direction may be parallel to one surface of the cover plate (210). The first direction and the second direction may be perpendicular to each other, the second direction and the third direction may be perpendicular to each other, and the third direction and the first direction may be perpendicular to each other.

[0041] The can housing (100) can form the exterior of the battery cell (1). The can housing (100) can be formed in a cylindrical shape. The can housing (100) can accommodate some of the components of the battery cell (1) inside. The diameter of the can housing (100) can be formed larger than the diameter of the electrode assembly (20). The can housing (100) can protect the components housed inside from external impacts, etc.

[0042] The can housing (100) may include a material having conductivity such as metal. For example, the can housing (100) may be made of conductive metal such as aluminum, steel, stainless steel, etc., but is not limited thereto.

[0043] A housing opening (120, see FIG. 5) may be formed on one side of the can housing (100). The can housing (100) may accommodate components of a battery cell (1) in a receiving space (110) formed inside the can housing (100) through the housing opening (120). For example, the can housing (100) may accommodate an electrode assembly (20), a first current collector (41), a second current collector (42), a connecting plate (43), and a lead (44), etc., in the receiving space (110).

[0044] The can housing (100) can receive an electrolyte injected through the housing opening (120). The electrolyte can enable lithium ions generated by an electrochemical reaction on the electrode plate inside the battery cell (1) to move during the charging and discharging of the battery cell (1).

[0045] The electrode assembly (20) may have a wound structure comprising a first electrode plate (21), a second electrode plate (22), and a separator (23) positioned between the first electrode plate (21) and the second electrode plate (22). The electrode assembly (20) may be formed as a jelly roll type in which a center hole (24) is formed. The electrode assembly (20) may be manufactured by winding a structure formed by sequentially stacking the first electrode plate (21), the separator (23), the second electrode plate (22), and the separator (23) at least once. The first electrode plate (21), the second electrode plate (22), and the separator (23) may be formed in a wide sheet shape. For example, the first electrode plate (21) may be an anode plate, and the second electrode plate (22) may be a cathode plate.

[0046] The positive plate may include a positive active material. The positive active material may be applied to one or both sides of the positive plate. The negative plate may include a negative active material. The negative active material may be applied to one or both sides of the negative plate. The positive active material coated on the positive plate and the negative active material coated on the negative plate may be used without limitation as long as they are active materials known in the art. For example, lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, nickel cobalt manganese oxide, etc. may be used as the positive active material, and graphite, silicon-graphite composite, lithium metal, etc. may be used as the negative active material.

[0047] The separator (23) can be placed between the positive plate and the negative plate to electrically insulate the positive plate and the negative plate. The separator (23) may include an insulating material. For example, the separator (23) may include a porous polymer film, a porous polymer film made of a polyolefin-based polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene / butene copolymer, an ethylene / hexene copolymer, an ethylene / methacrylate copolymer, etc., either alone or by laminating them.

[0048] The first current collector (41) may be disposed on one side of the electrode assembly (20). The first current collector (41) may have a disc shape corresponding to the electrode assembly (20). For example, the first current collector (41) may be connected to the positive plate of the electrode assembly (20) to guide the generated current to the positive terminal.

[0049] The second current collector (42) may be placed on the other side of the electrode assembly (20). The second current collector (42) may have a disc shape corresponding to the electrode assembly (20). For example, the second current collector (42) may be connected to the negative plate of the electrode assembly (20) to guide the generated current to the negative terminal.

[0050] The first current collector (41) may be a positive current collector and the second current collector (42) may be a negative current collector, but is not limited thereto. For example, depending on changes in the structure or design of the battery cell (1), the first current collector (41) may be a negative current collector and the second current collector (42) may be a positive current collector.

[0051] The materials of the positive current collector and the negative current collector can be appropriately selected. For example, the materials of the positive current collector and the negative current collector may include aluminum, copper, nickel, titanium, or stainless steel, but are not necessarily limited thereto, and metals and metal alloys commonly used as current collector materials may be adopted. For example, the positive current collector may be aluminum or an aluminum alloy, and the negative current collector may be copper or a copper alloy.

[0052] In a tab-less cylindrical secondary battery as illustrated in the drawing, the positive terminal may be a sealing cover (200) and the negative terminal may be a can housing (100). For example, a first current collector (41) may be connected to a first electrode plate (21). The first current collector (41) may be connected to a connecting plate (43) through a strip-shaped lead (44). A second current collector (42) may be connected to a second electrode plate (22). The second current collector (42) may be connected to the bottom of the can housing (100). In FIG. 5, the connecting plate (43), lead (44), and cover plate (210) are shown separated before the battery sealing cover (200) and the fixed frame (300) are combined, but the sealing cover (200) can be combined with the lead (44) and the connecting plate (43) first before being combined with the fixed frame (300).

[0053] If the internal components of the battery cell (1) are discharged outside the can housing (100), they may cause an explosion and ignition due to contact with surrounding circuits and adjacent battery cells (1). To prevent this, the battery cell (1) needs to be sealed.

[0054] The battery cell (1) may include a sealing body provided to seal the receiving space (110) of the can housing (100). The sealing body may include a sealing cover (200) and a fixed frame (300). The sealing cover (200) may cover the housing opening (120) to seal the receiving space (110) of the can housing (100) by engaging with the fixed frame (300). For example, after the components of the battery cell (1) are received in the can housing (100), the sealing cover (200) and the fixed frame (300) may seal the housing opening (120) of the can housing (100) and block the inside and outside of the battery cell (1).

[0055] The sealing cover (200) can cover the housing opening (120) to seal the receiving space (110) of the can housing (100). The sealing cover (200) can be electrically connected to the electrode assembly (20). For example, the sealing cover (200) can be electrically connected to the electrode assembly (20) through a first current collector (41), a lead (44), and a connecting plate (43).

[0056] The sealing cover (200) may include a cover plate (210) and a plate coupling portion (220) that covers the outer surface of the cover plate (210) and extends radially outward from the outer surface of the cover plate (210). The plate coupling portion (220) may be positioned so that the lower end of the plate coupling portion (220) is spaced apart from the first current collector (41).

[0057] The cover plate (210) can be electrically connected to the electrode assembly (20). The cover plate (210) can be electrically connected to the electrode assembly (20) through the first current collector (41), the lead (44), and the connecting plate (43). The cover plate (210) can be formed in the shape of a circular plate. The sealing cover (200) may include a conductive metal material. For example, the sealing cover (200) may include aluminum (Al).

[0058] The plate coupling portion (220) may be formed in a ring shape that surrounds the cover plate (210). The cover plate (210) and the plate coupling portion (220) may be formed as a single body or may be manufactured separately and joined. In the latter case, for example, the plate coupling portion (220) may form an opening on the inside, and the inner opening of the plate coupling portion (220) may be sealed by the cover plate (210). In other words, the plate coupling portion (220) may be joined to the cover plate (210) so as to have a shape that extends radially outward from the outer surface of the cover plate (210).

[0059] The plate coupling portion (220) may include a coupling protrusion (221) protruding toward the cover receiving groove (310). The outer surface of the coupling protrusion (221) may have a slanted shape corresponding to the inner surface of the fixed frame (300). In other words, the outer surface of the coupling protrusion (221) may have a slanted shape toward the receiving space (110). The slanted outer surface of the coupling protrusion (221) may serve to guide the sealing cover (200) to facilitate coupling when the sealing cover (200) is coupled to the fixed frame (300).

[0060] The fixed frame (300) may be formed in a ring shape that accommodates a sealing cover (200) on the inside. An opening formed on the inside of the fixed frame (300) may be completely sealed by the sealing cover (200). The fixed frame (300) may be provided at the upper end of the can housing (100). A part of the fixed frame (300) may be accommodated in the receiving space (110) of the can housing (100).

[0061] The portion of the fixed frame (300) other than the portion accommodated in the receiving space (110) of the can housing (100) may be exposed to the upper side of the can housing (100). In other words, at least one upper portion of the fixed frame (300) may be exposed to the upper side of the can housing (100). The outer surface of the portion of the fixed frame (300) exposed to the upper side of the can housing (100) may form a plane identical to the outer surface of the can housing (100).

[0062] Depending on the method of joining the fixed frame (300), the can housing (100) may have a smooth surface where the beading process is not applied to the portion corresponding to the upper part of the first current collector (41). Therefore, when the battery cell (1) explodes and ignites, the force caused by the explosion may be less concentrated than when there is a beading portion. Due to the force caused by the explosion and ignition of the battery cell (1), the battery cell (1) receives a force mainly in the first direction, and as a result, at least one of the sealing cover (200) and the fixed frame (300) may detach from the can housing (100). As a result, the impact on other battery cells (1) or other structures adjacent to the battery cell (1) may be reduced.

[0063] A portion of the outer surface of the fixed frame (300) may be joined to face the inner surface of the can housing (100). The fixed frame (300) may be joined by a fitting into the housing opening (120) of the can housing (100). In other words, the outer diameter of the portion of the fixed frame (300) that is received inside the can housing (100) may be formed to be equal to or larger than the inner diameter of the can housing (100) corresponding to the outer surface of the fixed frame (300). As the fixed frame (300) is joined by a fitting into the can housing (100), substances such as the electrolyte inside the battery cell (1) may not leak out to the outside of the battery cell (1). However, the method of joining the fixed frame (300) and the can housing (100) is not limited thereto.

[0064] At least one area of ​​the fixed frame (300) may be positioned to overlap with the sealing cover (200) and the can housing (100) in a second direction. Specifically, the fixed frame (300) may overlap with the plate joint (220) and the can housing (100) in a second direction.

[0065] The fixed frame (300) may include an insulating material that electrically insulates the sealing cover (200) and the can housing (100). The fixed frame (300) can prevent electrical contact between the sealing cover (200) and the can housing (100). For example, the fixed frame (300) can electrically insulate the sealing cover (200), which acts as a positive terminal, and the can housing (100), which acts as a negative terminal.

[0066] The fixed frame (300) may include a cover receiving groove (310) formed to receive a portion of the sealing cover (200). The inner surface of the fixed frame (300) corresponding to the cover receiving groove (310) may be formed to correspond to the inclined outer surface of the coupling protrusion (221). That is, the inner surface of the fixed frame (300) corresponding to the cover receiving groove (310) may have an inclined shape toward the inside of the receiving space (110). The inclined inner surface of the fixed frame (300) may support the sealing cover (200) so that the sealing cover (200) does not detach into the interior of the battery cell (1).

[0067] The fixed frame (300) may include a connecting rib (320). The connecting rib (320) may be formed on the upper part of the fixed frame (300). The connecting rib (320) may serve to prevent the sealing cover (200) from easily detaching from the fixed frame (300) by being caught on the fixed frame (300). The connecting rib (320) may cover a portion of the upper surface of the sealing cover (200). As the connecting rib (320) secures the sealing cover (200), the battery cell (1) does not require a crimping process to seal the can battery cell (1) by bending a portion of the can housing (100), thereby simplifying the manufacturing process of the battery cell (1).

[0068] The fixed frame (300) can fix the sealing cover (200) to one position on the fixed frame (300). The coupling rib (320) can cover a portion of the upper surface of the coupling protrusion (221) to prevent the sealing cover (200) from coming out of the battery cell (1). The inclined inner surface of the fixed frame (300) can support the coupling protrusion (221) to prevent the sealing cover (200) from coming out of the battery cell (1).

[0069] FIG. 6 is a drawing showing an enlarged view of part P of FIG. 4, FIG. 7 is a drawing showing a disassembled view of a part of a battery cell (1) according to one embodiment, and FIG. 8 is a drawing showing a part of a battery cell (1) according to one embodiment.

[0070] Referring to FIG. 6, the space between the can housing (100) and the fixed frame (300), and the space between the fixed frame (300) and the sealing cover (200) can be sealed by bringing two opposing members into close contact face-to-face. As a result, the inside and outside of the battery cell (1) can be sealed so that material inside the battery cell (1) does not leak out to the outside of the battery cell (1).

[0071] The lower end of the fixed frame (300) can support the first current collector (41). The fixed frame (300) can fix the first current collector (41), the second current collector (42), and the electrode assembly (20) inside the can housing (100) so that they do not move in the first direction. As the lower end of the fixed frame (300) supports the first current collector (41), the electrode assembly (20) is fixed inside the receiving space (110), thereby improving the stability of the battery cell (1).

[0072] Referring to FIGS. 7 and 8, when the sealing cover (200) is coupled to the fixed frame (300), a first force (F1) substantially parallel to the first direction may be applied to the sealing cover (200) by a user or a battery manufacturing device.

[0073] Referring together with FIG. 6, the sealing cover (200) can be coupled from the upper part of the fixed frame (300) into the interior of the fixed frame (300). When the sealing cover (200) and the fixed frame (300) are coupled, it may be difficult to easily combine them if there is a tolerance. To solve this problem, the fixed frame (300) may include an insertion guide surface (330). The coupling rib (320) may include an insertion guide surface (330) that guides the movement of the sealing cover (200) when the sealing cover (200) is received in the fixed frame (300). The insertion guide surface (330) may have a shape inclined toward the inside of the receiving space (110).

[0074] When the sealing cover (200) is inserted into the fixed frame (300) by a first force (F1), it may receive a second force (F2) by the insertion guide surface (330). The second force (F2) may act in a direction toward the center of the sealing cover (200). The second force (F2) may be part of the force that the insertion guide surface (330) acts on the sealing cover (200).

[0075] The maximum outer diameter of the coupling protrusion (221) of the plate coupling portion (220) may be larger than the minimum inner diameter of the coupling rib (320). Accordingly, the plate coupling portion (220) may include an elastic body that is easily deformable so that the sealing cover (200) is coupled to the fixed frame (300). In other words, the plate coupling portion (220) may include an elastic body that can contract by being pressed by a second force (F2) by the coupling rib (320) when the sealing cover (200) is coupled to the fixed frame (300). The plate coupling portion (220) may expand as the coupling protrusion (221) is received in the cover receiving groove (310) when the coupling protrusion (221) passes through the coupling rib (320).

[0076] Although various embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and it will be obvious to those with average knowledge in the art that various modifications and variations are possible within the scope of the technical concept of the present invention as described in the claims. Furthermore, the above-described embodiments may be implemented by deleting some components, and each embodiment may be implemented in combination with one another.

Claims

1. An electrode assembly wound along a first direction as an axis in a stacked state, comprising an anode, a cathode, and a separator; A can housing having a receiving space for accommodating the electrode assembly and a housing opening formed on the upper side; A sealing cover that covers the housing opening to seal the above receiving space and is electrically connected to the electrode assembly; and A battery cell comprising: a fixing frame provided at the upper end of the can housing to engage with the sealing cover and fix the sealing cover, and including a cover receiving groove formed to accommodate a part of the sealing cover.

2. In Paragraph 1, The sealing cover above is, A cover plate electrically connected to the electrode assembly; and It includes a plate coupling portion extending radially outward from the outer surface of the above cover plate, and The above plate coupling part is, A battery cell having a coupling protrusion protruding toward the cover receiving groove, wherein the outer surface of the coupling protrusion has a slanted shape corresponding to the inner surface of the fixed frame.

3. In Paragraph 2, The above fixed frame is, A battery cell further comprising a coupling rib covering a portion of the upper surface of the above-mentioned coupling protrusion.

4. In Paragraph 3, The above fixed frame is, A battery cell that overlaps the plate coupling portion and the can housing in a second direction perpendicular to the first direction.

5. In Paragraph 4, A current collector disposed between the electrode assembly and the fixed frame; further comprising The bottom of the above fixed frame is a battery cell that supports the above current.

6. In Paragraph 5, The sealing cover above is, A battery cell in which the lower end of the plate coupling portion is spaced apart from the current collector.

7. In Paragraph 3, A battery cell comprising an elastic body that is compressed by the coupling rib when the sealing cover is coupled to the fixed frame.

8. In Paragraph 3, The above connecting rib is, A battery cell further comprising an insertion guide surface having a shape inclined toward the inside of the receiving space to guide the movement of the sealing cover when the sealing cover is received in the fixed frame.

9. In Paragraph 1, A battery cell in which the inner surface of the fixed frame corresponding to the cover receiving groove has a shape inclined toward the inside of the receiving space.

10. In Paragraph 1, The above fixed frame is, A battery cell coupled to the can housing by fitting into the housing opening of the can housing.

11. In Paragraph 1, The above fixed frame is, A battery cell comprising an insulating material that electrically insulates the sealing cover and the can housing.

12. In Paragraph 1, A battery cell in which at least one region of the upper portion of the fixed frame is exposed to the upper side of the can housing, and the outer surface of the can housing forms a plane with the outer surface of the exposed fixed frame.

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