Battery pack

Abstract

The invention provides a battery pack. The battery pack includes a battery cell, a case accommodating the battery cell, a bus bar electrically connecting the battery cell, a holder portion fixing a bottom portion and a side portion of the battery cell, and a cooling unit below the holder portion to cool the battery cell, and a filling portion contacting surface portions of the battery cells between the plurality of battery cells and the cooling unit. The filling portion covers at least a portion of a bottom portion of the battery cell and at least a portion of a side portion of the battery cell.

Description

[0001] This application claims the priority and benefit of Korean Patent Application No. 10-2023-0167188, filed with the Korean Intellectual Property Office on November 27, 2023, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] One or more embodiments relate to a battery pack. Background Art

[0003] Generally, unlike primary batteries that cannot be recharged, secondary batteries can be charged and discharged. Secondary batteries are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, etc. Depending on the type of external device to which the secondary battery is applied, the secondary battery can be used in the form of a single battery or in the form of a module in which multiple battery cells are connected and grouped into one unit.

[0004] Small mobile devices such as mobile phones can operate for a certain amount of time based on the output and capacity of a single battery, while for devices that require long-term driving and high-power operation (such as electric vehicles and hybrid vehicles that consume a large amount of power), due to output and capacity issues, a module type including multiple batteries can be utilized. The output voltage or output current can increase as the number of built-in batteries increases. Summary of the Invention

[0005] One or more embodiments provide a battery pack that achieves heat dissipation performance due to a structure in which an opening portion is formed in a holder portion for fixing battery cells.

[0006] One or more embodiments provide a battery pack that achieves a fixing force for battery cells through a structure for fixing the bottom and side portions of battery cells together.

[0007] However, these problems are exemplary, and the problems to be solved by the present disclosure are not limited thereto.

[0008] Additional aspects will be set forth in part in the description that follows and, in part, will be apparent from the description, or may be learned by practice of the embodiments presented in the present disclosure.

[0009] According to one or more embodiments, a battery pack includes battery cells, a housing that houses the battery cells, a bus bar that electrically connects the battery cells, a holder portion that fixes the bottom and side portions of the battery cells, a cooling unit that cools the battery cells below the holder portion, and a filling portion that contacts a surface portion of the battery cells between the plurality of battery cells and the cooling unit. The filling portion covers at least a part of the bottom of the battery cells and at least a part of the side of the battery cells.

[0010] In a battery pack according to an embodiment of the present disclosure, the retainer portion may include an opening portion through which a part of the bottom and a part of the side of the battery cell are exposed, and the filling portion may cover the part of the bottom and the part of the side of the battery cell exposed through the opening portion.

[0011] In a battery pack according to an embodiment of the present disclosure, the sheet portion may be between the filling portion and the cooling unit.

[0012] In a battery pack according to an embodiment of the present disclosure, the retainer portion may include: a first retainer portion that fixes the side of the battery cell along the circumferential direction of the side of the battery cell among the battery cells; a second retainer portion located at a substantially center of the bottom of the battery cell; and a third retainer portion that bends along the bottom and the side and connects the first retainer portion to the second retainer portion.

[0013] In a battery pack according to an embodiment of the present disclosure, the second retainer portion may have an annular shape and a first opening portion on the bottom of the battery cell, such that the battery cell can be exposed to the outside of the retainer portion through the first opening portion.

[0014] In a battery pack according to an embodiment of the present disclosure, a first filling portion covering a part of the bottom of the battery cell may be received in the first opening portion.

[0015] In a battery pack according to an embodiment of the present disclosure, the third retainer portion may include: a 3-1 retainer portion circumferentially arranged around the second retainer portion and radially extending outward from the second retainer portion on the bottom of the battery cell; and a second opening portion between two adjacent 3-1 retainer portions among the 3-1 retainer portions on the bottom of the battery cell outside the second retainer portion, such that the battery cell can be exposed to the outside of the retainer portion through the second opening portion.

[0016] In a battery pack according to an embodiment of the present disclosure, a second filling portion covering a part of the bottom of the battery cell may be received in the second opening portion.

[0017] In a battery pack according to an embodiment of the present disclosure, the first retainer portion may be spaced apart from the bottom of the battery cell, and the third retainer portion may include: 3-2 retainer portions spaced apart from each other in the circumferential direction of the side of the battery cell; and a third opening portion between the first retainer portion and the bottom of the battery cell and between two adjacent 3-2 retainer portions on the side of the battery cell, such that the battery cell can be exposed to the outside of the retainer portion through the third opening portion.

[0018] In a battery pack according to an embodiment of the present disclosure, a third filling portion covering a part of the side of a battery cell may be received in a third opening portion.

[0019] In a battery pack according to an embodiment of the present disclosure, the first holder portion, the second holder portion, and the third holder portion may be integral.

[0020] In a battery pack according to an embodiment of the present disclosure, the third holder portion may include: a 3-1 holder portion circumferentially disposed around the second holder portion and radially extending from the second holder portion on the bottom of the battery cell; and a 3-2 holder portion spaced apart from each other in the circumferential direction of the side of the battery cell. The 3-1 holder portion and the 3-2 holder portion may be integral.

[0021] Other aspects, features, and advantages other than those described above will become apparent from the following detailed description, claims, and drawings for practicing the present disclosure. Description of the Drawings

[0022] The above and other aspects, features, and advantages of certain embodiments of the present disclosure will become more apparent from the following description in conjunction with the drawings: Figure 1 is a partially exploded perspective view of a battery pack according to one or more embodiments of the present disclosure; Figure 2 is a partial plan view of a battery pack according to one or more embodiments of the present disclosure; Figure 3 is an exploded perspective view of a plurality of battery cells and holder portions according to one or more embodiments of the present disclosure; Figure 4 is a plan view of a holder portion according to one or more embodiments of the present disclosure; Figure 5 is along Figure 3 a cross-sectional view taken along A-A in Figure 6 is along Figure 3 a view of the battery pack as viewed in the direction B of Figure 7 is according to one or more embodiments of the present disclosure along Figure 3 a view of the battery pack including a filling portion as viewed in the direction B of Figure 8 is an exploded perspective view of a part of a holder portion into which a battery cell according to one or more embodiments of the present disclosure is inserted and a filling portion. Detailed Description

[0023] Reference will now be made in detail to the embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the embodiments presented may have different forms and should not be construed as limited to the description set forth herein. Accordingly, the embodiments are described below only by reference to the accompanying drawings to explain aspects of the present specification. As used herein, the term "and / or" includes any combination and all combinations of one or more of the associated listed items.

[0024] The present disclosure may have various modifications and various embodiments, and thus specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, it should be understood that this is not intended to limit the present disclosure to the specific embodiments, and it should be understood to include all changes, equivalents, and alternatives falling within the spirit and scope of the present disclosure. To describe the present disclosure, the same components will be denoted by the same reference numerals even when shown in different embodiments.

[0025] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals, and redundant descriptions thereof will be omitted.

[0026] In the following embodiments, terms such as first, second, etc. have been used to distinguish one component from other components, rather than being restrictive.

[0027] In the following embodiments, unless the context clearly indicates otherwise, the singular form includes the plural form.

[0028] In the following embodiments, the terms "comprising", "having", etc. are intended to mean that there are the features or components described herein, but do not exclude the possibility of adding one or more other features or components.

[0029] In the drawings, for ease of description, the dimensions of components may be exaggerated or reduced. For example, for ease of description, the dimensions and thicknesses of each component shown in the figures are shown, and thus the present disclosure is not necessarily limited to the illustration.

[0030] In the following embodiments, the x-axis, y-axis, and z-axis are not limited to the three axes on an orthogonal coordinate system and may be interpreted in a broad sense including them. For example, the x-axis, y-axis, and z-axis may be orthogonal to each other, or may also refer to different directions that are not orthogonal to each other.

[0031] If certain embodiments can be implemented otherwise, the specific process order may be performed differently from the described order. For example, two consecutively described processes may be performed substantially simultaneously, or may be performed in an order opposite to the described order.

[0032] The terms used herein are for describing particular embodiments and are not intended to limit the present disclosure. Herein, it should be understood that the terms "comprising", "having", etc. are used to mean the presence of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0033] Hereinafter, reference will be made to Figures 1 to 8 describe a battery pack according to an embodiment of the present disclosure.

[0034] Figure 1 is a partially exploded perspective view of a battery pack according to an embodiment of the present disclosure. Figure 2 is a partial plan view of a battery pack according to an embodiment of the present disclosure. Figure 3 is an exploded perspective view of a plurality of battery cells and a holder part according to an embodiment of the present disclosure. Figure 4 is a plan view of a holder part according to an embodiment of the present disclosure. Figure 5 is along Figure 3 A cross-sectional view taken along A-A. Figure 6 is along Figure 3 A view of the battery pack observed in the direction B. Figure 7 is along Figure 3 A view of the battery pack including a filling part observed in the direction. Figure 8 is an exploded perspective view of a part of a holder part into which a battery cell is inserted and a filling part.

[0035] Referring to Figures 1 to 8 , a battery pack according to an embodiment of the present disclosure may include: a plurality of battery cells 300; a housing 100 that houses the plurality of battery cells 300; a bus bar 400 that electrically connects the plurality of battery cells 300; a holder part 200 that fixes the bottoms and sides of the plurality of battery cells 300; a cooling unit 110 that is below the holder part 200 and is configured to cool the plurality of battery cells 300; and a filling part 210 that is configured to contact a surface part of the plurality of battery cells 300 between the plurality of battery cells 300 and the cooling unit 110. The filling part 210 may cover at least a part of the bottom of the plurality of battery cells 300 and at least a part of the sides of the plurality of battery cells 300.

[0036] The housing 100 may have a rectangular parallelepiped shape as shown in Figure 1 . Although the housing 100 is depicted and described as having a rectangular parallelepiped shape, in one or more embodiments, the housing 100 may have any other suitable shape. An array of the plurality of battery cells 300 may be accommodated in the inner space of the housing 100. The plurality of battery cells 300 may be cylindrical secondary batteries configured to be repeatedly charged and discharged.

[0037] A plurality of battery cells 300 may be arranged in multiple columns and rows inside the housing 100, and the plurality of battery cells 300 arranged in multiple columns and rows may be arranged alternately (e.g., staggered).

[0038] The plurality of battery cells 300 arranged in multiple columns and rows may be fixed by the holder portion 200 inside the housing 100. The holder portion 200 may be on the lower part of the plurality of battery cells 300 to fix the plurality of battery cells 300.

[0039] The bus bar 400 may be on the upper part of the plurality of battery cells 300. The bus bar 400 may be on the upper part of the plurality of battery cells 300 and connected to all of the plurality of battery cells 300 to electrically connect the plurality of battery cells 300 to each other.

[0040] According to one or more embodiments, a cooling unit 110 configured to cool the plurality of battery cells 300 may be below the holder portion 200. The cooling unit 110 may be disposed inside the bottom of the housing 100 below the holder portion 200. A coolant may flow over the cooling unit 110. The temperature of the battery pack 10 may be controlled by appropriately discharging or reducing the heat generated during the operation of the plurality of battery cells 300 via the cooling unit 110.

[0041] The sheet portion 120 may be disposed between the cooling unit 110 and the holder portion 200. The sheet portion 120 may be a polyethylene terephthalate (PET) sheet having insulation properties. Electrical insulation between the plurality of battery cells 300 and the housing 100 may be achieved through the sheet portion 120.

[0042] The filling portion 210 may be between the sheet portion 120 and the plurality of battery cells 300 mounted on the holder portion 200. In one or more embodiments, the filling portion 210 may be a thermal glue (thermal glue) having electrical insulation properties. The filling portion 210 may be an adhesive material that promotes heat transfer and cures thermally. Although in one or more embodiments, the filling portion 210 is described as a thermal glue, in one or more embodiments, the filling portion 210 may be an adhesive material having thermal conductivity, such as a silicone adhesive, etc., but the present disclosure is not limited thereto.

[0043] The filling portion 210 (e.g., hot glue) can be on the top surface of the sheet portion 120 and thus can be received in the opening portion 211 in the holder portion 200 as will be described below. Heat generated in the plurality of battery cells 300 can be transferred to the cooling unit 110 through the filling portion 210 (e.g., hot glue having thermal conductivity). Electrical insulation can be achieved between the plurality of battery cells 300 and the housing 100 including the cooling unit 110 through the filling portion 210 (e.g., hot glue having thermal conductivity and electrical insulation).

[0044] The holder portion 200 can be on the lower part of the plurality of battery cells 300 to fix the plurality of battery cells 300. The holder portion 200 can be configured to receive the plurality of battery cells 300 at the same interval (or substantially the same interval) such that each of the plurality of battery cells 300 can be fixed to the holder portion 200 at a constant interval (or substantially constant interval) from the adjacent battery cell 300.

[0045] According to one or more embodiments, the holder portion 200 can include an opening portion 211 through which a part of the bottom and a part of the side of the plurality of battery cells 300 are exposed, and the filling portion 130 can cover a part of the bottom and a part of the side of the plurality of battery cells 300 exposed by the opening portion 211.

[0046] The holder portion 200 can be configured to fix not only the bottom but also the sides of the plurality of battery cells 300 to prevent (or at least mitigate) the plurality of battery cells 300 from inadvertently moving out of the holder portion 200 by fixing the plurality of battery cells 300. In this way, it is possible to prevent the plurality of battery cells 300 mounted on the holder portion 200 from tilting, thereby maintaining a constant or substantially constant interval between the plurality of battery cells 300 and thus achieving the mechanical stability of the plurality of battery cells 300.

[0047] The opening portion 211 in the holder portion 200 can be on the sides and the bottom of the plurality of battery cells 300, and the filling portion 210 can cover both the bottom and the sides of the plurality of battery cells 300, thereby achieving a heat dissipation function through the sides of the plurality of battery cells 300 and thus further improving the heat dissipation performance of the plurality of battery cells 300.

[0048] The filling portion 210 (e.g., hot glue) can be or include a material having electrical insulation, and the holder portion 200 and the sheet portion 120 can also be or include materials having electrical insulation such that the electrical insulation between the plurality of battery cells 300 and the housing 100 including the cooling unit 110 can be triple protected.

[0049] Hereinafter, the detailed structures of the holder part 200 and the filling part 210 according to one or more embodiments will be described in more detail.

[0050] According to one or more embodiments, the holder part 200 may include a first holder part 201 that extends along the circumferential direction of the side part of the battery cell among the plurality of battery cells 300 to fix the side part of the battery cell, a second holder part 202 at the center of the bottom of the battery cell, and a third holder part 203 that bends along the bottom and the side part and connects the first holder part 201 to the second holder part 202.

[0051] The first holder part 201 may be formed in the circumferential direction of the side part of the cylindrical battery cell to fix the side part of the battery cell. Thus, due to the first holder part 201, the battery cell inserted into the first holder part 201 cannot move in the side (lateral) direction.

[0052] The second holder part 202 may have an annular shape (i.e., a wheel shape) at the center of the bottom of the cylindrical battery cell to fix the bottom of the battery cell. Thus, due to the second holder part 202, the battery cell mounted on the second holder part 202 cannot move in the downward direction.

[0053] The third holder part 203 may connect the first holder part 201 to the second holder part 202 and may bend along the corner part of the battery cell mounted on the first holder part 201 and the second holder part 202. The third holder part 203 may extend radially outward from the second holder part 202. In one or more embodiments, the third holder part 203 may include four third holder parts 203 that are circumferentially arranged around the second holder part 202 and extend radially outward from the second holder part 202, but the number of the third holder parts 203 is not limited thereto. The third holder parts 203 may be arranged at regular intervals (or substantially regular intervals) in the circumferential direction around the second holder part 202.

[0054] The first holder part 201, the second holder part 202, and the third holder part 203 may be integrally formed. In this way, the rigidity of the holder part 200 can be achieved, thereby ensuring the fixing force with respect to the plurality of battery cells 300.

[0055] On the bottom 301 of the battery cell, the first opening portion 211a may be included in the second holder portion 202 (e.g., the first opening portion 211a may be formed by the annular second holder portion 202), and the battery cell may be exposed to the outside of the holder portion 200 through the first opening portion 211a. The first filling portion 210a covering a part of the bottom 301 of the battery cell may be received in the first opening portion 211a.

[0056] In this way, the heat generated on the bottom 301 of the plurality of battery cells 300 may be dissipated to the outside of the plurality of battery cells 300 through the first filling portion 210a on the bottom of the plurality of battery cells 300.

[0057] The third holder portion 203 may further include a plurality of 3-1 holder portions 203a, which are circumferentially arranged around the second holder portion 202 on the bottom 301 of the battery cell and radially extend outward from the second holder portion 202 on the bottom 301 of the battery cell.

[0058] On the bottom 301 of the battery cell, the second opening portion 211b may be formed between the outside of the second holder portion 202 and two adjacent 3-1 holder portions 203a among the plurality of 3-1 holder portions 203a, and the battery cell may be exposed to the outside of the holder portion 200 through the second opening portion 211b. The second filling portion 210b covering a part of the bottom 301 of the battery cell may be received in the second opening portion 211b.

[0059] In this way, the heat generated on the bottom and lower corner portions of the plurality of battery cells 300 may be dissipated to the outside of the plurality of battery cells 300 through the second filling portion 210b arranged on the bottom and corner portions of the plurality of battery cells 300.

[0060] The first holder portion 201 may be located at a position spaced apart from the bottom 301 of the battery cell, and the third holder portion 203 may include a plurality of 3-2 holder portions 203b spaced apart from each other in the circumferential direction of the side portion 302 of the battery cell.

[0061] On the side portion 302 of the battery cell, the third opening portion 211c may be formed between the first holder portion 201 and the bottom 301 of the battery cell and between two adjacent 3-2 holder portions 203b among the plurality of 3-2 holder portions 203b, and the battery cell may be exposed to the outside of the holder portion 200 through the third opening portion 211c. The third filling portion 210c covering a part of the side portion 302 of the battery cell may be received in the third opening portion 211c.

[0062] In this way, the heat generated on the side portions 302 of the plurality of battery cells 300 can be dissipated to the outside of the plurality of battery cells 300 through the third filling portion 210c on the side portions 302 of the plurality of battery cells 300.

[0063] In one or more embodiments, the 3-1 retainer portion 203a and the 3-2 retainer portion 203b that form the third retainer portion 203 may be integral to protect the corner portions of the plurality of battery cells 300, and the filling portion 210 may be received in the opening portion formed by the 3-1 retainer portion 203a and the 3-2 retainer portion 203b, thereby achieving heat dissipation performance for the heat generated on the corner portions of the plurality of battery cells 300 and achieving insulation for the corner portions of the plurality of battery cells 300.

[0064] Thus, the present disclosure is described with reference to the embodiments shown in the drawings, but this is merely an example. Those of ordinary skill in the art will fully understand that various modifications and other equivalent embodiments are feasible through the embodiments. Therefore, the true technical scope of the present disclosure should be defined by the appended claims.

[0065] The specific technical details described in the embodiments are examples and do not limit the technical scope of the embodiments. In order to briefly and clearly describe the present disclosure in the specification, the description of conventional general technologies and configurations may be omitted.

[0066] The connection of the lines or connection members between the components shown in the drawings is an illustration of a functional connection and / or a physical or circuit connection, and in practice, it may represent various functional connections, physical connections, or circuit connections as alternatives or additions. Additionally, components that may not be essential for the application of the present disclosure may not be mentioned specifically such as "must" or "important".

[0067] Unless otherwise specifically restricted, the indicative terms "the (said)" or similar indicative terms described in the specification and claims may refer to both singular and plural. Additionally, when a range is described in an embodiment, the range includes the present disclosure applicable to the individual values falling within the range (unless otherwise stated), and is the same as the description of the individual values constituting the range in the description of the present disclosure.

[0068] When there is no obvious description of the operation sequence constituting the method according to the embodiment or its opposite description, the operations may be performed in an appropriate order.

[0069] However, the description order of the operations does not necessarily limit the present disclosure. All examples or exemplary terms (such as etc.) used in the present disclosure are for simply and detailedly describing the present disclosure, and the scope of the present disclosure is not limited by the examples or exemplary terms unless the claims limit it.

[0070] In addition, those of ordinary skill in the art will understand that various modifications, combinations, and changes can be made within the scope of the appended claims or their equivalents in accordance with design conditions and factors.

[0071] The battery pack according to an embodiment of the present disclosure can achieve heat dissipation performance through a structure in which an opening portion is formed on a holder portion for fixing battery cells.

[0072] The battery pack according to an embodiment of the present disclosure can achieve the fixing force of battery cells through a structure for fixing the bottom and side portions of the battery cells together.

[0073] The effects of the present disclosure are not limited to the effects mentioned above, and those of ordinary skill in the art will clearly understand other effects not mentioned from the description of the claims and the specific embodiments.

[0074] It should be understood that the embodiments described herein should be considered only in a descriptive sense and not for purposes of limitation. The description of features or aspects within each embodiment should generally be considered applicable to other similar features or aspects in other embodiments. Although one or more embodiments have been described with reference to the accompanying drawings, those of ordinary skill in the art will understand that various changes in form and detail can be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A battery pack, comprising: Multiple battery cells; A housing for accommodating the plurality of battery cells; A bus bar electrically connecting the plurality of battery cells; a holder portion fixing bottoms and sides of the plurality of battery cells; a cooling unit under the holder portion and configured to cool the plurality of battery cells; as well as a filling portion contacting a surface portion of the plurality of battery cells between the plurality of battery cells and the cooling unit, The filling portion covers at least a portion of the bottoms of the plurality of battery cells and at least a portion of the sides of the plurality of battery cells.

2. The battery pack according to claim 1, wherein: The retainer portion includes an opening portion through which a portion of the bottom and a portion of the side of the plurality of battery cells are exposed, and wherein the filling portion covers a portion of the bottom and a portion of the side of the plurality of battery cells exposed by the opening portion. 3 . The battery pack according to claim 1 , further comprising a sheet portion between the filling portion and the cooling unit.

4. The battery pack according to claim 1, wherein: The retainer portion comprises: a first retainer portion that fixes the side of one battery cell among the plurality of battery cells in a circumferential direction of the side of the one battery cell; a second retainer portion located in a substantial center of a bottom portion of the one battery cell among the plurality of battery cells, the second retainer portion fixing the bottom portion of the one battery cell; and A third retainer portion is bent along the bottom and the side of the one battery cell among the plurality of battery cells, the third retainer portion connecting the first retainer portion to the second retainer portion.

5. The battery pack according to claim 4, wherein: The second holder portion has a ring shape and a first opening portion on the bottom of the one battery cell, and wherein the one battery cell is exposed to the outside of the holder portion through the first opening portion. 6 . The battery pack according to claim 5 , further comprising a first filling portion covering a portion of the bottom of the one battery cell accommodated in the first opening portion.

7. The battery pack according to claim 4, wherein: The third retainer portion comprises: a plurality of 3-1 retainer portions circumferentially arranged around the second retainer portion and extending radially outwardly from the second retainer portion on the bottom of the one battery cell; and a second opening portion between an outer side of the second retainer portion and two adjacent 3-1 retainer portions among the plurality of 3-1 retainer portions on the bottom of the one battery cell, The one battery cell is exposed to the outside of the holder portion through the second opening portion. 8 . The battery pack according to claim 7 , further comprising a second filling portion covering a portion of the bottom of the one battery cell accommodated in the second opening portion.

9. The battery pack according to claim 4, wherein: The first retainer portion is spaced apart from the bottom of the one battery cell, and wherein the third retainer portion comprises: a plurality of 3-2 retainer portions spaced apart from one another in a circumferential direction of the side portion of the one battery cell; and a third opening portion between the first retainer portion and the bottom of the one battery cell and between two adjacent 3-2 retainer portions among the plurality of 3-2 retainer portions on the side of the one battery cell, The one battery cell is exposed to the outside of the holder portion through the third opening portion. 10 . The battery pack according to claim 9 , further comprising a third filling portion covering a portion of the side of the one battery cell accommodated in the third opening portion.

11. The battery pack according to claim 4, wherein: The first retainer portion, the second retainer portion and the third retainer portion are integral.

12. The battery pack according to claim 11, wherein: The third retainer portion comprises: a plurality of 3-1 retainer portions circumferentially arranged around the second retainer portion and extending radially outwardly from the second retainer portion on the bottom of the one battery cell; and a plurality of 3-2 retainer portions spaced apart from each other in a circumferential direction of the side portion of the battery cell, and Wherein, the 3-1st retainer part and the 3-2nd retainer part are integrated.

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