Battery pack

Abstract

A battery pack is provided. The battery pack includes: a battery cell; a pouch covering the battery cell and including a land formed in a first direction in which an electrode of the battery cell is drawn out; a flexible circuit board including a controller configured to control charging and discharging of the battery cells, a connector communicating with an external device, and a connection portion flexibly connecting the controller to the connector; a protection element disposed on the controller on the first surface of the flexible circuit board; and a molded portion covering a protective element on the controller, wherein at least a portion of the flexible circuit board on a second surface opposite the first surface is arranged opposite the module placement surface of the mesa.

Description

Technical Field

[0001] One or more embodiments relate to a battery pack. Background Art

[0002] Secondary batteries can be charged and discharged multiple times, allowing for repeated use. They are used as energy sources for mobile devices, electric vehicles, hybrid vehicles, electric bicycles, uninterruptible power supplies, and the like. Depending on the type of external device they are used in, secondary batteries are used as single cells or as packs in which multiple battery cells are connected and grouped into a single unit. Summary of the Invention

[0003] One or more embodiments include a battery pack capable of controlling charge and discharge of battery cells through a protection element disposed on a flexible circuit board.

[0004] One or more embodiments include a battery pack including a protection circuit module having high volume efficiency by being miniaturized using a flexible circuit board.

[0005] Additional aspects will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the presented embodiments of the disclosure.

[0006] According to one or more embodiments, a battery pack includes: a battery cell; a pouch covering the battery cell and including a terrace formed in a first direction, with electrodes of the battery cell led out in the first direction; a flexible circuit board including a controller configured to control charging and discharging of the battery cell, a connector for communicating with an external device, and a connecting portion for flexibly connecting the controller to the connector; a protective element arranged on the controller on a first surface of the flexible circuit board; and a molded portion covering the protective element on the controller, wherein at least a portion of the flexible circuit board on a second surface opposite to the first surface is arranged opposite to a module placement surface of the terrace.

[0007] The flexible circuit board, the protection element and the molded portion may form a protection circuit module.

[0008] The protection circuit module may be fixed such that the second surface of the flexible circuit board is opposite to the module seating surface.

[0009] The module seating surface may be arranged on the bag in a second direction intersecting the first direction.

[0010] The mesa, the flexible circuit board, the protection member, and the molded portion may be arranged to overlap in the second direction.

[0011] The mesa, the flexible circuit board, the protection member, and the molded portion may be sequentially arranged in the order in the second direction.

[0012] The molded portion may include a thermally conductive material to discharge heat emitted from the protection element to the outside of the protection circuit module.

[0013] The thickness of the flexible circuit board may fall within a range of about 0.1 mm to about 0.5 mm.

[0014] The distance between the first surface and the second surface may fall within a range of about 0.1 mm to about 0.5 mm.

[0015] The flexible circuit board may further include connection tabs arranged on the second surface and electrically connected to electrodes of the battery cell.

[0016] The connection portion of the flexible circuit board may include at least a portion extending in a direction intersecting a direction in which the controller extends, thereby connecting the controller to the connector.

[0017] The pouch may include a receiving portion receiving the battery cell, and the receiving portion may be formed on opposite sides of the pouch in a third direction intersecting the first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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 accompanying drawings.

[0019] Figure 1 is a perspective view of a battery pack according to an embodiment;

[0020] Figure 2 is an assembled view of a battery pack according to an embodiment;

[0021] Figure 3 is a view for describing a terrace of a bag according to an embodiment;

[0022] Figure 4 is a view for describing one surface of a flexible circuit board according to an embodiment;

[0023] Figure 5 is used to describe Figure 4 a view of another surface of the flexible circuit board opposite to the one surface shown in ;

[0024] Figure 6 is a combined view of a molded portion and a flexible circuit board according to an embodiment;

[0025] Figure 7 is a view for describing a molded portion formed on a flexible circuit board according to an embodiment;

[0026] Figure 8 is a view for describing a structure in which a protection circuit module is connected to a first electrode and a second electrode of a battery cell according to an embodiment; and

[0027] Figure 9 is a view for describing a structure in which a protection circuit module is arranged on a terrace of a bag according to an embodiment. DETAILED DESCRIPTION

[0028] Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. In this regard, the embodiments may have different forms and should not be construed as limited to the description set forth herein. Accordingly, the embodiments will be described below solely with reference to the accompanying drawings to illustrate various aspects of this specification. As used herein, the term "and / or" includes any and all combinations of one or more of the relevant listed items.

[0029] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The terms and words used in the present specification and claims described above should not be interpreted as being limited to the common meaning or dictionary meaning, and should be interpreted as meanings and concepts consistent with the technical ideas of the present disclosure based on the concept that the inventor can appropriately define the terms so as to describe the principle of his invention in the best way. Therefore, it should be understood that the configurations shown in the drawings and the embodiments described in this specification are only the most preferred embodiments of the present disclosure and do not represent all the technical ideas of the present disclosure, so that various equivalents and variations that replace them may exist when submitting this application. If used in this article, "including, containing" and / or "including ..., including ... " indicate the existence of the shapes, numbers, steps, operations, components, assemblies and / or these groups mentioned, and do not exclude the existence or addition of one or more different shapes, numbers, operations, components, assemblies and / or groups. If the embodiments of the present disclosure are described, "can" or "may" may include "one or more embodiments of the present disclosure".

[0030] To help understand the present disclosure, the accompanying drawings are not shown according to actual scale, but the sizes of some components may be exaggerated. In different embodiments, the same reference numerals may be assigned to the same components.

[0031] The statement that two comparison targets are "the same" as each other can mean that they are "substantially the same" as each other. Therefore, the case where they are "substantially the same" as each other can include the case where they have a deviation that is considered to be low (for example, a deviation of 5% or less). If the uniformity parameter is uniform in a predetermined area, this can mean that they are uniform from the perspective of average.

[0032] Although the first, second, etc. can be used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from other components, and unless specifically stated otherwise, the first component may be the second component.

[0033] Throughout the specification, unless specifically stated otherwise, each component may be in the singular or in the plural.

[0034] If a component is arranged on the "top part (or bottom part)" of another component or arranged "on (or below)" another component, this may not only mean that the component is arranged adjacent to the top surface (or bottom surface) of the other component, but also mean that another component can be inserted between the other component and the component arranged on (or below) the other component.

[0035] If a component is described as being “connected,” “coupled,” or “linked” to another component, it should be understood that the components are directly connected or connectable to each other, another component may be “interposed” between the components, or the components may be “connected,” “coupled,” or “linked” to each other through another component. If one part is electrically coupled to another part, this includes not only a case where they are directly connected to each other, but also a case where they are connected with another element in between.

[0036] Throughout the specification, unless otherwise specifically stated, "A and / or B" may mean A, B, or A and B. That is, "and / or" may include all or any combination of the listed items. Unless otherwise specifically stated, "C to D" may mean at least C but no more than D.

[0037] Hereinafter, a battery pack according to an embodiment will be described with reference to the accompanying drawings.

[0038] Figure 1 is a perspective view of a battery pack 1 according to an embodiment. Figure 2 is an assembly view of the battery pack 1 according to the embodiment.

[0039] refer to Figure 1 and Figure 2, the battery pack 1 according to the embodiment may include a battery cell 20. The battery cell 20 may include a negative electrode plate, a positive electrode plate and a separator arranged therebetween. A negative electrode tab electrically connected to the negative electrode non-coating portion may be provided in the negative electrode plate, and a positive electrode tab electrically connected to the positive electrode non-coating portion may be provided in the positive electrode plate. The negative electrode tab may be a first electrode 21. The positive electrode tab may be a second electrode 22. The battery cell 20 may be, but is not limited to, an electrode component including a first electrode 21 and a second electrode 22. The battery pack 1 according to the embodiment may include a bag 30 configured to accommodate the battery cell 20. The bag 30 may accommodate the battery cell 20. The battery cell 20 may be accommodated inside the bag 30. The bag 30 may cover the battery cell 20. The bag 30 may expose at least part of the first electrode 21 and the second electrode 22. At least part of the first electrode 21 and the second electrode 22 may be exposed to the outside of the bag 30. The first electrode 21 and the second electrode 22 exposed to the outside of the bag 30 may be electrically connected to a reference later. Figure 6 The protection circuit module 40 is described.

[0040] The pouch 30 according to the embodiment may include a receiving portion 300 receiving the battery cell 20. The battery cell 20 may be received inside the receiving portion 300 of the pouch 30.

[0041] Return Reference Figure 2 , the accommodating portion 300 of the bag 30 may be formed in a direction intersecting with the first direction z, and the first electrode 21 and the second electrode 22 of the battery cell 20 are led out in the first direction z. More specifically, the accommodating portion 300 of the bag 30 may be formed in the x-axis direction (also referred to as the "third direction"). The accommodating portion 300 of the bag 30 may be foamed on one side to accommodate the battery cell 20. However, the manner of forming the accommodating portion 300 of the bag 30 is not limited to the foregoing description. For example, Figure 2 Unlike in the embodiment of the present invention, the receiving portions 300 of the bag 30 may be formed on opposite sides of the bag 30 in a direction intersecting the first direction z.

[0042] The accommodating portion 300 of the bag 30 according to the embodiment may be formed on opposite sides of the bag 30 in a direction intersecting with the first direction z, and the first electrode 21 and the second electrode 22 of the battery cell 20 are led out in the first direction z. More specifically, the accommodating portion 300 of the bag 30 may be formed in the x-axis direction and in a direction opposite to the x-axis direction. If the accommodating portion 300 of the bag 30 is formed on opposite sides of the bag 30, this may mean that the bag 30 is foamed on opposite sides of the bag 30. However, the foregoing description of the shape and treatment of the accommodating portion 300 of the bag 30 is merely an example and is not limited thereto. The accommodating portion 300 of the bag 30 configured to accommodate the battery cell 20 may also be configured in various ways.

[0043] Figure 3 is a view for illustrating the terrace 31 of the bag 30 according to the embodiment. Figure 3 It shows Figure 2 Each corner of the bag 30 shown in FIG. 1 is sealed.

[0044] refer to Figure 2 and Figure 3 The first and second electrodes 21 and 22 of the battery cell 20 according to the embodiment may be drawn out in a first direction z. The first direction z may be an upward direction of the pouch 30. The first and second electrodes 21 and 22 of the battery cell 20 may be drawn out in an upward direction of the pouch 30.

[0045] The pouch 30 according to the embodiment may include a terrace 31 formed thereon. The pouch 30 may include the terrace 31 formed in the first direction z, and the first electrode 21 and the second electrode 22 of the battery cell 20 are led out in the first direction z. The terrace 31 may be where the following reference Figure 6 Part of the protection circuit module 40 is described.

[0046] The terrace 31 according to the embodiment may include a module placement surface 311 formed in a direction facing the front surface of the bag 30. The module placement surface 311 may be a surface of the terrace 31 formed in a direction facing the front surface of the bag 30. The module placement surface 311 may be a surface of the terrace 31 formed in the x-axis direction. The module placement surface 311 may be a surface where the following reference Figure 6 The protection circuit module 40 is described as a portion thereof. However, the description of the arrangement and functions of the terrace 31 and the module placement surface 311 is merely an example and is not limited thereto.

[0047] Figure 4 is a view showing a surface of a flexible circuit board 50 according to an embodiment. Figure 5 is shown with Figure 4 FIG. 2 is a view of another surface of the flexible circuit board 50 opposite to the surface shown in FIG.

[0048] refer to Figures 3 to 5 The battery pack 1 according to the embodiment may include a flexible circuit board 50. The flexible circuit board 50 may include a controller 501 that controls the charging and discharging of the battery cells 20. The controller 501 may be electrically connected to the battery cells 20. The controller 501 may selectively block or allow power to be supplied to the battery cells 20. The controller 501 may prevent excessive power from being supplied to the battery cells 20. The controller 501 may prevent the function of the battery cells 20 from being deteriorated due to excessive power supply to the battery cells 20.

[0049] The controller 501 according to the embodiment may be a region where the protection element 60 is disposed on the flexible circuit board 50. The protection element 60 may control charging and discharging of the battery cell 20. However, the function of the protection element 60 is not limited to the foregoing description.

[0050] The flexible circuit board 50 according to the embodiment may include a first surface 51 and a second surface 52 opposite to the first surface 51. The protection element 60 may be arranged on the first surface 51 of the flexible circuit board 50. The protection element 60 may be arranged on the controller 501 on the first surface 51 of the flexible circuit board 50. However, the arrangement of the protection element 60 is not limited to the foregoing description.

[0051] The flexible circuit board 50 according to the embodiment may include a connection tab 53 electrically connected to the first electrode 21 and the second electrode 22 of the battery cell 20. The connection tab 53 may be arranged on the second surface 52 of the flexible circuit board 50. The connection tab 53 may be arranged on the controller 501 of the flexible circuit board 50. The connection tab 53 may be arranged on another surface of the flexible circuit board 50 opposite to the surface on which the protective element 60 is arranged. However, the arrangement of the connection tab 53 is not limited to the foregoing description.

[0052] Return Reference Figure 1 and Figures 3 to 5 The flexible circuit board 50 according to the embodiment may include a connector 502 for communicating with an external device. The connector 502 may electrically connect the external device to the battery cell 20.

[0053] Meanwhile, the flexible circuit board 50 according to the embodiment may include a connection portion 503 that flexibly connects the controller 501 to the connector 502. The connection portion 503 may flexibly connect the controller 501 to the connector 502. If the connection portion 503 flexibly connects the controller 501 to the connector 502, this may mean that the relative position of the connector 502 and the controller 501 is adjusted by the connection portion 503. If the connection portion 503 flexibly connects the controller 501 to the connector 502, this may mean that the position of the connector 502 is adjusted by the deformation of the connection portion 503. If the connection portion 503 flexibly connects the controller 501 to the connector 502, this may mean that the user can freely arrange the connector 502 by changing the form of the connection portion 503. In other words, the connection portion 503 can adjust the arrangement position of the connector 502 by flexibly deforming.

[0054] The controller 501, the connector 502 and the connecting portion 503 according to the embodiment can be provided as a whole. The controller 501, the connector 502 and the connecting portion 503 may include a flexible material having a form that can be changed by an external force. The controller 501, the connector 502 and the connecting portion 503 can be continuously connected. On the controller 501, the connector 502 and the connecting portion 503, the first surface 51 and the second surface 52 can be continuously connected. That is, each of the first surface 51 and the second surface 52 can be smoothly formed on the controller 501, the connector 502 and the connecting portion 503. However, the shapes of the controller 501, the connector 502 and the connecting portion 503 are not limited to the foregoing description.

[0055] The connection portion 503 of the flexible circuit board 50 according to the embodiment may include at least a portion extending in a direction intersecting the direction in which the controller 501 extends, thereby connecting the controller 501 to the connector 502. If at least a portion of the connection portion 503 of the flexible circuit board 500 extends in a direction intersecting the direction in which the controller 501 extends, the position of the connector 502 can be easily adjusted. However, the foregoing description of the shape and function of the connection portion 503 is merely an example, and the present disclosure is not limited thereto.

[0056] Figure 6 is a combined view of the mold portion 70 and the flexible circuit board 50 according to an embodiment. Figure 7 is a view illustrating a molding portion 70 formed on a flexible circuit board 50 according to an embodiment.

[0057] refer to Figure 4 、 Figure 6 and Figure 7 The battery pack 1 according to the embodiment may include a molded portion 70. The molded portion 70 may be arranged on the first surface 51 of the flexible circuit board 50. The molded portion 70 may cover the controller 501 of the flexible circuit board 50. The molded portion 70 may be arranged on the same surface as the surface of the flexible circuit board 50 on which the protective element 60 is arranged. The molded portion 70 may cover the protective element 60 on the controller 501.

[0058] The molded portion 70 according to the embodiment can support the flexible circuit board 50. The molded portion 70 can support the controller 501 of the flexible circuit board 50. The molded portion 70 can extend in the direction along which the controller 501 of the flexible circuit board 50 extends. The molded portion 70 can extend in the second direction y. The molded portion 70 can be made of a solid material. The material of the molded portion 70 can be made of a resin. The material of the molded portion 70 can be made of a metal. The molded portion 70 can prevent the controller 501 of the flexible circuit board 50 from deforming due to external forces. The molded portion 70 can also prevent the circuit of the controller 501 of the flexible circuit board 50 from being damaged. However, the function of the molded portion 70 is not limited to the above description.

[0059] Meanwhile, the flexible circuit board 50, the protective element 60, and the molded portion 70 according to the embodiment may form the protective circuit module 40. The protective circuit module 40 may include the flexible circuit board 50, the protective element 60, and the molded portion 70. Hereinafter, a structure in which the protective circuit module 40 is arranged on the terrace 31 of the bag 30 will be described.

[0060] Figure 8 is a view illustrating a structure in which a protection circuit module 40 is connected to the first electrode 21 and the second electrode 22 of the battery cell 20 according to an embodiment. Figure 9 3 is a view for describing a structure in which the protection circuit module 40 is arranged on the terrace 31 of the bag 30 according to the embodiment.

[0061] refer to Figures 6 to 9 , the connection tab 53 of the flexible circuit board 50 according to the embodiment can be electrically connected to the first electrode 21 and the second electrode 22 of the battery cell 20. If the connection tab 53 is connected to the first electrode 21 and the second electrode 22 of the battery cell 20, this may mean that the battery cell 20 is electrically connected to the controller 501 of the flexible circuit board 50. If the connection tab 53 is connected to the first terminal and the second terminal of the battery cell 20, this may mean that the battery cell 20 is electrically connected to the protection circuit module 40.

[0062] The protection circuit module 40 according to the embodiment can be pivotally arranged on the terrace 31 of the pouch 30 after the connection tab 53 is connected to the first and second electrodes 21 and 22 of the battery cell 20. The protection circuit module 40 can be pivotally arranged on the terrace 31 of the pouch 30 with the second direction y as the axis. The pivoting of the protection circuit module 40 can mean that the second surface 52 of the flexible circuit board 50 is arranged from a direction facing the front surface of the pouch 30 to a direction facing the rear surface of the pouch 30. The pivoting of the protection circuit module 40 can mean that the second surface 52 of the flexible circuit board 50 is arranged from a direction facing the third direction x to a direction opposite to the third direction x. The pivoting of the protection circuit module 40 can mean that the first surface 51 of the flexible circuit board 50 is arranged from a direction facing the rear surface of the pouch 30 to a direction facing the front surface of the pouch 30. The pivoting of the protection circuit module 40 can mean that the first surface 51 of the flexible circuit board 50 is arranged from a direction opposite to the third direction x to a direction facing the third direction x.

[0063] Return Reference Figure 6 、 Figure 7 and Figure 9 At least a portion of the second surface 52 of the flexible circuit board 50 according to the embodiment may be arranged opposite to the module installation surface 311 of the terrace 31. The module installation surface 311 of the terrace 31 may be a surface of the terrace 31 formed in a direction facing the front surface of the bag 30. The module installation surface 311 of the terrace 31 may extend in the second direction y. The module installation surface 311 of the terrace 31 may be a surface of the terrace 31 formed in the second direction y.

[0064] The protection circuit module 40 according to the embodiment may be fixed so that the second surface 52 of the flexible circuit board 50 faces the module installation surface 311 of the terrace 31. In order to fix the protection circuit module 40 so that the second surface 52 of the flexible circuit board 50 faces the module installation surface 311, the protection circuit module 40 and the module installation surface 311 may be arranged to overlap in the third direction x.

[0065] The terrace 31, the flexible circuit board 50, the protective element 60, and the molded portion 70 according to the embodiment can be arranged to overlap in the third direction x. The terrace 31, the flexible circuit board 50, the protective element 60, and the molded portion 70 according to the embodiment can be arranged in the order described in the third direction x. The heat dissipated by the protective element 60 can be discharged in the third direction x. The heat dissipated by the protective element 60 can be discharged in the third direction x through the molded portion 70. The molded portion 70 can include a material with high thermal conductivity. The molded portion 70 can include a thermally conductive material to discharge the heat dissipated from the protective element 60 to the outside of the protection circuit module 40. The molded portion 70 can discharge the heat dissipated from the protective element 60 to the outside of the battery pack 1.

[0066] Meanwhile, the flexible circuit board 50 may have a predetermined thickness T in the third direction x. The thickness T of the flexible circuit board 50 may be the distance between the first surface 51 and the second surface 52 of the flexible circuit board 50. When the thickness T of the flexible circuit board 50 is not thick, the thickness of the protective circuit module 40 can be prevented from increasing. When the thickness T of the flexible circuit board 50 is not thick, a miniaturized protective circuit module 40 can be provided. When the thickness T of the flexible circuit board 50 is not thick, the volumetric efficiency of the battery pack 1 can be improved. When the thickness T of the flexible circuit board 50 is not thick, the energy efficiency of the battery pack 1 can be improved. In particular, when the thickness T of the controller 501 of the flexible circuit board 50 is not thick, the terrace 31 and the protective circuit module 40, which overlap in the third direction x, can be prevented from becoming excessively thick in the third direction x.

[0067] The thickness T of the flexible circuit board 50 according to the embodiment may be about 0.05 mm to about 1 mm. The thickness T of the flexible circuit board 50 may be about 0.1 mm to about 0.5 mm. The distance between the first surface 51 and the second surface 52 of the flexible circuit board 50 may be about 0.05 mm to about 1 mm. The distance between the first surface 51 and the second surface 52 of the flexible circuit board 50 may be about 0.1 mm to about 0.5 mm. However, the foregoing description of the thickness T of the flexible circuit board 50 is merely an example, and the present disclosure is not limited thereto.

[0068] Although the present disclosure has been described with reference to the examples shown in the accompanying drawings, it will be understood by those skilled in the art that various modifications and equivalent other examples may be made from the shown examples.

[0069] The battery pack according to the present disclosure may be able to control charging and discharging of battery cells through a protection element disposed on a flexible circuit board.

[0070] A battery pack according to the present disclosure may include a protection circuit module having high volume efficiency by being miniaturized using a flexible circuit board.

[0071] It should be understood that the embodiments described herein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions 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.

[0072] This application claims priority to and the benefit of Korean Patent Application No. 10-2024-0035980 filed on March 14, 2024, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference in its entirety.

Claims

1. A battery pack comprising: Battery cells; a pouch covering the battery cell and including a terrace formed in a first direction, wherein electrodes of the battery cell are led out in the first direction; Flexible circuit boards, including: a controller configured to control the charging and discharging of the battery cells; a connector to communicate with an external device; and a connecting portion for flexibly connecting the controller to the connector; a protection element disposed on the controller on the first surface of the flexible circuit board; and a molded portion covering the protective element on the controller, At least a portion of the flexible circuit board on a second surface opposite to the first surface is arranged to be opposite to a module placement surface of the stage. 2 . The battery pack according to claim 1 , wherein the flexible circuit board, the protection element, and the molded portion form a protection circuit module. 3 . The battery pack according to claim 2 , wherein the protection circuit module is fixed so that the second surface of the flexible circuit board is positioned opposite to the module seating surface. 4 . The battery pack according to claim 3 , wherein the module seating surface is arranged on the pouch in a second direction intersecting the first direction. 5 . The battery pack according to claim 4 , wherein the mesa, the flexible circuit board, the protection element, and the molded portion are arranged to overlap with each other in the second direction. 6 . The battery pack according to claim 5 , wherein the mesa, the flexible circuit board, the protection element, and the molded portion are sequentially arranged in the order in the second direction. 7 . The battery pack according to claim 6 , wherein the molded portion comprises a thermally conductive material to discharge heat emitted from the protection element to the outside of the protection circuit module. 8 . The battery pack according to claim 1 , wherein a thickness of the flexible circuit board falls within a range of 0.1 mm to 0.5 mm. 9 . The battery pack according to claim 8 , wherein a distance between the first surface and the second surface falls within a range of 0.1 mm to 0.5 mm. 10 . The battery pack according to claim 9 , wherein the flexible circuit board includes connection tabs arranged on the second surface and electrically connected to the electrodes of the battery cells. 11 . The battery pack according to claim 1 , wherein the connection portion of the flexible circuit board includes at least a portion extending in a direction intersecting a direction in which the controller extends, thereby connecting the controller to the connector. 12 . The battery pack according to claim 1 , wherein the pouch includes a receiving portion receiving the battery cell, and the receiving portions are formed on opposite sides of the pouch in a third direction intersecting the first direction.

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