Battery pack

Abstract

The utility model 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. The battery pack may achieve heat dissipation performance through a structure in which an opening portion is formed on a holder portion to which the battery cells are fixed, and may achieve a fixing force of the battery cells through a structure for fixing the bottom and side portions of the battery cells together.

Description

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

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

[0003] Unlike primary batteries, which cannot be recharged, secondary batteries can typically be charged and discharged. They are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, and more. Depending on the type of external device using the secondary battery, it can be used as a single cell or as a module in which multiple individual cells are connected and grouped into a single 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. However, for devices requiring long-term operation and high power (such as high-power electric and hybrid vehicles), due to output and capacity limitations, module types comprising multiple batteries can be utilized. The output voltage or output current can increase with the number of built-in batteries. Utility Model Content

[0005] One objective of this invention is to provide a battery pack that achieves heat dissipation performance due to a structure in which an opening is formed in the holder portion that holds the individual battery cells.

[0006] Another objective of this invention is to provide a battery pack that achieves the fixing force of the battery cells through a structure for fixing the bottom and sides of the battery cells together.

[0007] However, these problems are exemplary, and the problems to be addressed in this disclosure are not limited thereto.

[0008] Additional aspects will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practicing the embodiments presented in this disclosure.

[0009] According to one or more embodiments, a battery pack includes battery cells, a housing containing the battery cells, a busbar electrically connecting the battery cells, a retainer portion securing the bottom and sides of the battery cells, a cooling unit below the retainer portion for cooling the battery cells, and a filling portion contacting the surface portions of the battery cells between a plurality of battery cells and the cooling unit. The filling portion covers at least a portion of the bottom and at least a portion of the sides 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 portion of the bottom and a portion of the side of a battery cell are exposed, and a filling portion may cover the portion of the bottom and a portion of the side of the battery cell exposed by the opening portion.

[0011] In a battery pack according to an embodiment of the present disclosure, the sheet portion may be located 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, which is positioned along the circumferential direction of the side portion of the battery cell to secure the side portion of the battery cell; a second retainer portion, which is located approximately at the center of the bottom of the battery cell; and a third retainer portion, which is bent along the bottom and side portion 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 at the bottom of the battery cell, such that the battery cell is exposed to the outside of the retainer portion through the first opening.

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

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

[0017] In a battery pack according to an embodiment of the present disclosure, a first retainer portion may be spaced apart from the bottom of the battery cell, and the third retainer portion may include: third-second 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 third-second retainer portions on the side of the battery cell, such that the battery cell may 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 portion of the side of a battery cell can be accommodated in a third opening portion.

[0019] In the battery pack according to embodiments of the present disclosure, the first retainer portion, the second retainer portion, and the third retainer portion may be integrated.

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

[0021] Other aspects, features, and advantages besides those described above will become apparent from the following detailed description, claims, and drawings used in the practice of this disclosure.

[0022] According to embodiments of the present invention, the battery pack can achieve heat dissipation performance by forming an opening in the holder portion that fixes the battery cells, and can achieve battery cell fixing force by a structure for fixing the bottom and sides of the battery cells together. Attached Figure Description

[0023] The above and other aspects, features and advantages of certain embodiments of this disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings:

[0024] Figure 1 This is a partially exploded perspective view of a battery pack according to one or more embodiments of the present disclosure;

[0025] Figure 2 This is a partial plan view of a battery pack according to one or more embodiments of the present disclosure;

[0026] Figure 3 This is an exploded perspective view of multiple battery cells and retainer portions according to one or more embodiments of the present disclosure;

[0027] Figure 4 This is a plan view of the retainer portion according to one or more embodiments of the present disclosure;

[0028] Figure 5 It is along Figure 3 The sectional view taken by AA in the image;

[0029] Figure 6 It is along Figure 3 View of the battery pack observed from direction B;

[0030] Figure 7 According to one or more embodiments of this disclosure Figure 3 A view of the battery pack, including the filled portion, observed from direction B; and

[0031] Figure 8 This is an exploded perspective view of a portion of the retainer portion and the filling portion into which a battery cell is inserted according to one or more embodiments of the present disclosure. Detailed Implementation

[0032] Reference will now be made in detail to embodiments, examples of which are shown in the accompanying drawings, wherein the same reference numerals refer to the same elements throughout. In this respect, the presented embodiments may take different forms and should not be construed as limited to the description set forth herein. Therefore, the embodiments are described below only by reference to the accompanying drawings to explain aspects of this specification. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0033] This disclosure can have various modifications and embodiments therein, and therefore specific embodiments will be shown in the accompanying drawings and described in detail in the detailed description. However, it should be understood that this is not intended to limit this disclosure to the specific embodiments, and should be construed as including all changes, equivalents, and substitutions falling within the spirit and scope of this disclosure. For the purpose of describing this disclosure, the same components will be designated by the same reference numerals even when shown in different embodiments.

[0034] In the following description, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, and in the description with reference to the drawings, the same or corresponding components will be given the same reference numerals, and redundant descriptions thereof will be omitted.

[0035] In the following embodiments, terms such as first, second, etc., are used to distinguish one component from other components, rather than as limiting terms.

[0036] In the following embodiments, unless the context clearly indicates otherwise, the singular form includes the plural form.

[0037] In the following embodiments, the terms “comprising”, “having”, etc. are intended to mean that the features or components described herein are present, but do not exclude the possibility of adding one or more other features or components.

[0038] In the accompanying drawings, the dimensions of components may be exaggerated or reduced for ease of description. For example, the dimensions and thickness of each component shown in the figures are illustrated for ease of description, and therefore this disclosure is not necessarily limited to the illustrations.

[0039] In the following embodiments, the x-axis, y-axis, and z-axis are not limited to three axes in an orthogonal coordinate system, and can be interpreted in a general sense that includes them. For example, the x-axis, y-axis, and z-axis can be orthogonal to each other, or they can refer to different directions that are not orthogonal to each other.

[0040] If certain embodiments can be implemented alternatively, a particular process sequence can be performed differently from the described sequence. For example, two consecutively described processes can be performed substantially simultaneously, or they can be performed in the reverse order of the described sequence.

[0041] The terminology used herein is for describing particular embodiments and is not intended to limit this disclosure. It should be understood that the terms “comprising,” “having,” etc., as used herein are intended to mean the presence of the features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, without excluding the presence or addition of one or more other features, quantities, steps, operations, components, parts, or combinations thereof.

[0042] In the following text, reference will be made to Figures 1 to 8 A battery pack according to an embodiment of the present disclosure is described.

[0043] Figure 1 This is a partially exploded perspective view of a battery pack according to an embodiment of the present disclosure. Figure 2 This is a partial plan view of a battery pack according to an embodiment of the present disclosure. Figure 3 This is an exploded perspective view of multiple battery cells and retainer portions according to embodiments of the present disclosure. Figure 4 This is a plan view of the retainer portion according to an embodiment of the present disclosure. Figure 5 It is along Figure 3 A sectional view taken from AA. Figure 6 It is along Figure 3 View of the battery pack from direction B. Figure 7 It is along Figure 3 A view of the battery pack including the filled portion, viewed from the direction of observation. Figure 8 It is an exploded perspective view of part of the retainer section into which the battery cell is inserted, as well as the filling section.

[0044] Reference Figures 1 to 8A battery pack according to embodiments of the present disclosure may include: a plurality of battery cells 300; a housing 100 for accommodating the plurality of battery cells 300; a busbar 400 electrically connecting the plurality of battery cells 300; a retainer portion 200 for securing the bottom and sides of the plurality of battery cells 300; a cooling unit 110 located below the retainer portion 200 and configured to cool the plurality of battery cells 300; and a filling portion 210 configured to contact surface portions of the plurality of battery cells 300 between the plurality of battery cells 300 and the cooling unit 110. The filling portion 210 may cover at least a portion of the bottom and at least a portion of the sides of the plurality of battery cells 300.

[0045] The housing 100 may have, for example Figure 1 The housing 100 is depicted and described as having a cuboid shape. While the housing 100 is shown and described as having a cuboid shape, in one or more embodiments, the housing 100 may have any other suitable shape. An array of multiple battery cells 300 may be accommodated within the interior space of the housing 100. The multiple battery cells 300 may be cylindrical secondary batteries configured for repeated charging and discharging.

[0046] Multiple battery cells 300 can be arranged in multiple columns and rows inside the housing 100, and the multiple battery cells 300 arranged in multiple columns and rows can be arranged alternately (e.g., staggered).

[0047] Multiple battery cells 300 arranged in multiple columns and rows can be secured by a retainer portion 200 inside the housing 100. The retainer portion 200 can be located on the lower part of the multiple battery cells 300 to secure them.

[0048] Busbar 400 may be located on the upper part of multiple battery cells 300. Busbar 400 may be located on the upper part of multiple battery cells 300 and connected to all of the multiple battery cells 300 to electrically connect the multiple battery cells 300 to each other.

[0049] According to one or more embodiments, a cooling unit 110 configured to cool a plurality of battery cells 300 may be located below the retainer portion 200. The cooling unit 110 may be disposed below the retainer portion 200 within the bottom of the housing 100. 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.

[0050] The sheet portion 120 can be arranged between the cooling unit 110 and the retainer portion 200. The sheet portion 120 can be an insulating polyethylene terephthalate (PET) sheet. Electrical insulation between multiple battery cells 300 and the housing 100 can be achieved through the sheet portion 120.

[0051] The filler portion 210 may be between the sheet portion 120 and a plurality of battery cells 300 mounted on the retainer portion 200. In one or more embodiments, the filler portion 210 may be a thermally insulating adhesive (thermal glue). The filler portion 210 may be an adhesive material that promotes heat transfer and is heat-cured. Although the filler portion 210 is described as a thermal adhesive in one or more embodiments, in one or more embodiments the filler portion 210 may be a thermally conductive adhesive material, such as a silicone adhesive, etc., but this disclosure is not limited thereto.

[0052] The filler portion 210 (e.g., thermal adhesive) can be located on the top surface of the sheet portion 120, and thus can be accommodated in the opening portion 211 in the retainer portion 200, which will be described below. Heat generated in the plurality of battery cells 300 can be transferred to the cooling unit 110 through the filler portion 210 (e.g., thermally conductive thermal adhesive). Electrical insulation between the plurality of battery cells 300 and the housing 100 including the cooling unit 110 can be achieved through the filler portion 210 (e.g., thermally conductive and electrically insulating thermal adhesive).

[0053] The retainer portion 200 can be mounted on the lower part of a plurality of battery cells 300 to secure the plurality of battery cells 300. The retainer portion 200 can be configured to accommodate 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 secured to the retainer portion 200 at a constant interval (or substantially constant interval) with the adjacent battery cell 300.

[0054] According to one or more embodiments, the retainer portion 200 may include an opening portion 211 through which a portion of the bottom and a portion of the side of a plurality of battery cells 300 are exposed, and a filling portion 130 may cover the portion of the bottom and a portion of the side of the plurality of battery cells 300 exposed by the opening portion 211.

[0055] The retainer portion 200 can be configured to secure not only the bottoms of the plurality of battery cells 300 but also the sides of the plurality of battery cells 300, in order to prevent (or at least mitigate) the unintentional displacement of the plurality of battery cells 300 from the retainer portion 200 by securing the plurality of battery cells 300. In this way, it is possible to prevent the plurality of battery cells 300 mounted on the retainer portion 200 from tilting, thereby maintaining a constant or substantially constant spacing between the plurality of battery cells 300, and thus achieving mechanical stability of the plurality of battery cells 300.

[0056] The opening 211 in the retainer portion 200 can be on the side and bottom of the plurality of battery cells 300, and the filling portion 210 can cover the bottom and side of the plurality of battery cells 300, thereby achieving heat dissipation through the side of the plurality of battery cells 300, and thus further improving the heat dissipation performance of the plurality of battery cells 300.

[0057] The filler portion 210 (e.g., hot glue) may be or include an electrically insulating material, and the retainer portion 200 and the sheet portion 120 may also be or include an electrically insulating material, 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.

[0058] The detailed structure of the retainer portion 200 and the filling portion 210 according to one or more embodiments will be described in more detail below.

[0059] According to one or more embodiments, the retainer portion 200 may include a first retainer portion 201 extending in a circumferential direction along the side of a battery cell among a plurality of battery cells 300 to secure the side of the battery cell, a second retainer portion 202 at the center of the bottom of the battery cell, and a third retainer portion 203 bending along the bottom and side and connecting the first retainer portion 201 to the second retainer portion 202.

[0060] The first retainer portion 201 can be formed in the circumferential direction of the side of the cylindrical battery cell to fix the side of the battery cell. Therefore, due to the first retainer portion 201, the battery cell inserted into the first retainer portion 201 cannot move in the lateral (transverse) direction.

[0061] The second retainer portion 202 may have an annular shape (i.e., a wheel shape) at the center of the bottom of the cylindrical battery cell to secure the bottom of the battery cell. Therefore, due to the second retainer portion 202, the battery cell mounted on the second retainer portion 202 cannot move in the downward direction.

[0062] The third retainer portion 203 can connect the first retainer portion 201 to the second retainer portion 202 and can be bent along the corner portion of the battery cell mounted on the first retainer portion 201 and the second retainer portion 202. The third retainer portion 203 can extend radially outward from the second retainer portion 202. In one or more embodiments, the third retainer portion 203 may include four third retainer portions 203 arranged circumferentially around the second retainer portion 202 and extending radially outward from the second retainer portion 202, but the number of third retainer portions 203 is not limited thereto. The third retainer portions 203 may be arranged at regular (or substantially regular) intervals in the circumferential direction around the second retainer portion 202.

[0063] The first retainer portion 201, the second retainer portion 202, and the third retainer portion 203 can be integrated. In this way, the rigidity of the retainer portion 200 can be achieved, thereby ensuring a fixing force relative to the plurality of battery cells 300.

[0064] On the bottom 301 of the battery cell, a first opening 211a may be included in a second retainer portion 202 (e.g., the first opening 211a may be formed by an annular second retainer portion 202), and the battery cell may be exposed to the outside of the retainer portion 200 through the first opening 211a. A first filling portion 210a covering a portion of the bottom 301 of the battery cell may be accommodated in the first opening 211a.

[0065] In this way, the heat generated on the bottom 301 of the plurality of battery cells 300 can 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.

[0066] The third retainer portion 203 may also include a plurality of third-first retainer portions 203a, which are arranged circumferentially around the second retainer portion 202 on the bottom 301 of the battery cell and extend radially outward from the second retainer portion 202 on the bottom 301 of the battery cell.

[0067] On the bottom 301 of the battery cell, a second opening 211b may be formed between the exterior of the second retainer portion 202 and two adjacent third-first retainer portions 203a among a plurality of third-first retainer portions 203a, and the battery cell may be exposed to the exterior of the retainer portion 200 through the second opening 211b. A second filling portion 210b covering a portion of the bottom 301 of the battery cell may be accommodated in the second opening 211b.

[0068] In this way, the heat generated at the bottom and lower corner portions of the multiple battery cells 300 can be dissipated to the outside of the multiple battery cells 300 through the second filling portion 210b arranged at the bottom and corner portions of the multiple battery cells 300.

[0069] The first retainer portion 201 may be located at a position spaced apart from the bottom 301 of the battery cell, and the third retainer portion 203 may include a plurality of third-second retainer portions 203b arranged spaced apart from each other in the circumferential direction of the side portion 302 of the battery cell.

[0070] On the side 302 of the battery cell, a third opening 211c may be formed between the first retainer portion 201 and the bottom 301 of the battery cell, and between two adjacent third-second retainer portions 203b among a plurality of third-second retainer portions 203b, and the battery cell may be exposed to the outside of the retainer portion 200 through the third opening 211c. A third filling portion 210c covering a portion of the side 302 of the battery cell may be accommodated in the third opening 211c.

[0071] In this way, the heat generated on the side 302 of the multiple battery cells 300 can be dissipated to the outside of the multiple battery cells 300 through the third filling portion 210c on the side 302 of the multiple battery cells 300.

[0072] In one or more embodiments, the third-1 retainer portion 203a and the third-2 retainer portion 203b forming 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 accommodated in the opening formed by the third-1 retainer portion 203a and the third-2 retainer portion 203b, thereby achieving heat dissipation performance for 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.

[0073] Thus, this disclosure has been described with reference to the embodiments shown in the accompanying drawings, but these are merely examples. It will be fully understood by those skilled in the art that various modifications and other equivalent embodiments are possible. Therefore, the true technical scope of this disclosure should be defined by the appended claims.

[0074] The specific technical details described in the embodiments are examples and do not limit the technical scope of the embodiments. For the sake of a brief and clear description of this disclosure, descriptions of conventional general techniques and constructions may be omitted.

[0075] The connections of lines or connecting elements between components shown in the accompanying drawings are illustrations of functional and / or physical or electrical connections, and in practice, may be represented as various alternative or additional functional, physical, or electrical connections. Furthermore, components that may not be essential for the application of this disclosure may not be required unless specifically mentioned as "must" or "important".

[0076] Unless otherwise specifically limited, the instruction "the (described)" or similar instruction described in the specification and claims may refer to both the singular and the plural. Additionally, when a scope is described in the embodiments, the scope includes the present disclosure applicable to individual values ​​falling within that scope (unless otherwise stated), and is identical to the description of the individual values ​​constituting the scope in the description of the present disclosure.

[0077] When there is no explicit description of the order of operations constituting the method according to the embodiment or the opposite description thereof, the operations may be performed in an appropriate order.

[0078] However, the order in which the operations are described is not necessarily limiting of this disclosure. All examples or exemplary terms (e.g., etc.) used in this disclosure are for the purpose of simply describing the disclosure in detail, and the scope of this disclosure is not limited by examples or exemplary terms unless the claims limit it.

[0079] Furthermore, those skilled in the art will understand that various modifications, combinations, and alterations can be made within the scope of the appended claims or their equivalents, depending on design conditions and factors.

[0080] According to embodiments of the present disclosure, the battery pack can achieve heat dissipation performance through a structure in which an opening is formed in the holder portion that holds the individual battery cells.

[0081] According to embodiments of the present disclosure, the battery pack can achieve the fixing force of the battery cells through a structure for fixing the bottom and sides of the battery cells together.

[0082] The effects of this disclosure are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims and the detailed embodiments.

[0083] It should be understood that the embodiments described herein are to be considered in a descriptive sense only and not for limiting purposes. 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, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of this disclosure as defined by the appended claims.

Claims

1. A battery pack, characterized in that, The battery pack includes: Multiple battery cells; A housing that accommodates the plurality of battery cells; The busbar electrically connects the multiple battery cells; The retainer section secures the bottom and sides of the plurality of battery cells; A cooling unit is located below the retainer portion and is configured to cool the plurality of battery cells; and The filling portion is the surface portion of the plurality of battery cells that contacts 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 bottom 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, characterized in that, The retainer portion includes an opening 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 the portion of the bottom and the portion of the side of the plurality of battery cells exposed by the opening.

3. The battery pack according to claim 1, characterized in that, The battery pack also includes a sheet portion between the filling portion and the cooling unit.

4. The battery pack according to claim 1, characterized in that, The retainer portion includes: In the circumferential direction of the side portion of one of the plurality of battery cells, the first retainer portion secures the side portion of the one battery cell. A second retainer portion is located approximately at the center of the bottom of one of the plurality of battery cells, and the second retainer portion secures the bottom of the one battery cell; and The third retainer portion bends along the bottom and side of one of the plurality of battery cells, and the third retainer portion connects the first retainer portion to the second retainer portion.

5. The battery pack according to claim 4, characterized in that, The second retainer portion has an annular shape and a first opening on the bottom of the battery cell, wherein the battery cell is exposed to the outside of the retainer portion through the first opening.

6. The battery pack according to claim 5, characterized in that, The battery pack also includes a first filling portion that covers a portion of the bottom of one of the battery cells housed in the first opening portion.

7. The battery pack according to claim 4, characterized in that, The third retainer portion includes: A plurality of third-first retainer portions are arranged circumferentially around the second retainer portion and extend radially outward from the second retainer portion on the bottom of the battery cell; and The second opening portion is located between two adjacent third-first retainer portions on the outer side of the second retainer portion and on the bottom of the battery cell. One of the battery cells is exposed to the outside of the retainer portion through the second opening.

8. The battery pack according to claim 7, characterized in that, The battery pack also includes a second filling portion that covers a portion of the bottom of one of the battery cells housed in the second opening portion.

9. The battery pack according to claim 4, characterized in that, The first retainer portion is spaced apart from the bottom of the battery cell, and wherein the third retainer portion includes: Multiple third-second retainer portions are spaced apart from each other in the circumferential direction of the side portion of the battery cell; and The third opening is located between the first retainer portion and the bottom of the battery cell, and between two adjacent third-second retainer portions among the plurality of third-second retainer portions on the side of the battery cell. One of the battery cells is exposed to the outside of the retainer portion through the third opening.

10. The battery pack according to claim 9, characterized in that, The battery pack also includes a third filling portion that covers a portion of the side of one of the battery cells housed in the third opening portion.

11. The battery pack according to claim 4, characterized in that, The first retainer portion, the second retainer portion, and the third retainer portion are integral.

12. The battery pack according to claim 11, characterized in that, The third retainer portion includes: A plurality of third-first retainer portions are arranged circumferentially around the second retainer portion and extend radially outward from the second retainer portion on the bottom of the battery cell; and Multiple third-second retainer portions are spaced apart from each other in the circumferential direction of the side portion of the battery cell, and The third-1 retainer portion and the third-2 retainer portion are integral.

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