Battery pack

Abstract

The present disclosure relates to a battery pack, and provides a battery pack comprising: a case; a plurality of battery cells arranged in the case; and a connection part insert-injection-molded into the case and connectable to the battery cells, wherein the connection part includes a bubble discharge part through which bubbles generated during injection-molding are discharged.

Description

battery pack

[0001] The present disclosure relates to a battery pack.

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries capable of both charging and discharging. Low-capacity secondary batteries are used in small portable electronic devices such as smartphones, feature phones, laptop computers, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources for motor drive systems and power storage batteries in hybrid and electric vehicles. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case housing the assembly, and electrode terminals connected to the electrode assembly.

[0003] A secondary battery can be used as a battery pack formed from a plurality of unit battery cells connected in series and / or parallel to provide high energy density. The battery pack can be formed by connecting the electrode terminals of a plurality of unit battery cells to each other to meet the required power amount and, for example, to realize a high-output secondary battery for an electric vehicle.

[0004] The information described above disclosed in the background technology of this invention is intended only to enhance understanding of the background of the present invention and may therefore include information that does not constitute prior art.

[0005] The purpose of the present invention is to provide a battery pack capable of improving the bonding strength between a connecting part inserted injection-molded into a case and the case.

[0006] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems can be clearly understood by those skilled in the art from the description of the invention below.

[0007] A battery pack according to an embodiment of the present invention for solving the above technical problem comprises: a case, a plurality of battery cells disposed in the case, and a connection portion inserted injection molded into the case and capable of connecting to the battery cells, wherein the connection portion is provided with a bubble discharge portion for discharging bubbles generated during the injection molding process.

[0008] The connection portion may include a connection terminal and a terminal holder to which the connection terminal is rotatably coupled.

[0009] A battery pack characterized in that the above connection terminal includes a metal material.

[0010] The above bubble discharge portion may be formed by penetrating the above connection terminal in a direction parallel to the first direction.

[0011] The above bubble discharge portion may be formed by penetrating the above connection terminal in a direction inclined with respect to the first direction.

[0012] The above bubble discharge portions may be spaced apart in multiple numbers along the circumferential direction of the connection terminal.

[0013] The above connection terminals may be spaced apart in multiple places along a direction parallel to the second direction that intersects the first direction in the terminal holder.

[0014] The above connection terminal may include a first connection socket accommodated in the terminal holder, a second connection socket extending along a first direction from the first connection socket, and a connection plate extending along a direction opposite to the first direction from the first connection socket and fixable to the terminal holder.

[0015] The outer diameter of the first connection socket may be smaller than the outer diameter of the second connection socket.

[0016] The interior of the first connection socket and the interior of the second connection socket can communicate with each other.

[0017] The second connection socket protrudes in the first direction from the terminal holder and can be exposed from the first surface of the case.

[0018] The above connection plate and the terminal holder may be exposed from the second surface of the case, which is positioned to face in a direction opposite to the first surface of the case.

[0019] The interior of the second connection socket is in communication with the first surface of the case, and the interior of the first connection socket can be in communication with the second surface of the case, which is positioned to face in a direction opposite to the first surface.

[0020] The above connection plates may be spaced apart in multiple numbers along the circumferential direction of the first connection socket.

[0021] The above connection plate may include a first connection plate extending from the first connection socket and a second connection plate extending from the first connection plate along a direction parallel to a second direction intersecting the first direction and facing the second connection socket at a spaced interval.

[0022] The above bubble discharge section may include a first bubble discharge section formed by being recessed on the outer surface of the first connection socket, and a second bubble discharge section communicating with the first bubble discharge section and penetrating the second connection socket.

[0023] The terminal holder may include a holder body portion and a receiving portion formed by penetrating the holder body portion in a direction parallel to the first direction, wherein the first connection socket and the connection plate are rotatably received.

[0024] The terminal holder may further include a seating portion that protrudes from the inner side of the receiving portion and is formed with a step from the right side of the holder body portion, on which the first connection socket is seated.

[0025] The terminal holder may further include a locking projection formed protruding from the inner surface of the receiving portion and restraining the connecting plate according to the rotational direction of the connecting plate to position it in a locked position in the receiving portion.

[0026] The terminal holder may further include a slit hole portion formed by being recessed in the locking projection portion and through which the connection plate passes depending on the rotational direction of the connection plate.

[0027] According to one embodiment of the present invention, in an insert injection molding process in which a metal connection terminal is coupled to a terminal holder and resin is injected into the mold while the terminal holder with the coupled connection terminal is placed inside the mold, bubbles generated can be discharged to the outside through a bubble discharge portion formed in the connection terminal. As a result, the bonding strength between the connection terminal inserted into the case and the case can be improved.

[0028] However, the effects obtainable through the present invention are not limited to those described above, and other unmentioned technical effects will be clearly understood by those skilled in the art from the description of the invention below.

[0029] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0030] FIG. 1 is a perspective view schematically showing the configuration of a battery pack according to one embodiment of the present invention.

[0031] FIG. 2 is a perspective view of a case according to one embodiment of the present invention, viewed from one direction.

[0032] Figure 3 is a perspective view of the case of Figure 2 viewed from a different direction.

[0033] Figure 4 is a cross-sectional view of Figure 2 cut along the line IX-IX.

[0034] FIG. 5 is a perspective view schematically showing the configuration of a connection part according to one embodiment of the present invention.

[0035] FIG. 6 is an exploded perspective view of a connection part according to one embodiment of the present invention, viewed from one direction.

[0036] Figure 7 is an exploded perspective view of the connection part of Figure 6 viewed from a different direction.

[0037] FIG. 8 is a cross-sectional view schematically showing a first embodiment of a connection terminal according to an embodiment of the present invention.

[0038] FIG. 9 is a cross-sectional view schematically showing a second embodiment of a connection terminal according to an embodiment of the present invention.

[0039] FIG. 10 is a cross-sectional view schematically showing a third embodiment of a connection terminal according to an embodiment of the present invention.

[0040] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention. Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0041] Additionally, as used herein, “comprise, include” and / or “comprising, including” specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and / or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and / or groups.

[0042] Additionally, to aid in understanding the invention, the attached drawings are not drawn to actual scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to identical components in different embodiments.

[0043] The statement that two subjects of comparison are 'identical' means that they are 'substantially identical.' Therefore, substantial identity may include deviations considered low in the industry, for example, deviations within 5%. Additionally, the statement that a parameter is uniform in a given area may mean that it is uniform from an average perspective.

[0044] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless specifically stated otherwise, the first component may also be the second component.

[0045] Throughout the specification, unless specifically stated otherwise, each component may be singular or plural.

[0046] The fact that any configuration is placed on the "upper (or lower)" of a component or on the "upper (or lower)" of a component may mean not only that any configuration is placed in contact with the upper (or lower) surface of said component, but also that another configuration may be interposed between said component and any configuration placed on (or below) said component.

[0047] Furthermore, where one component is described as being "on," "connected to," or "coupled to" another component, it should be understood that while the components may be directly connected or coupled to each other, another component may be "interposed" between each component, or that each component may be "connected," "coupled," or "coupled" through another component.

[0048] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Additionally, the use of “may” when describing embodiments of the present disclosure relates to “one or more embodiments of the present disclosure.” Expressions such as “one or more” and “one or more” preceding a list of elements modify the entire list of elements and do not modify individual elements of the list.

[0049] Throughout the specification, "A and / or B" means A, B, or A and B unless specifically stated otherwise, and "C to D" means C or more and D or less, unless specifically stated otherwise.

[0050] When syntax such as "at least one of A, B, and C", "at least one of A, B, or C", "at least one selected from the group of A, B, and C", or "at least one selected from A, B, and C" is used to specify a list of elements A, B, and C, the syntax can refer to any suitable combination.

[0051] The term "use" may be considered synonymous with the term "utilize." As used herein, "substantially," "about," and similar terms are used as terms of approximation rather than degree, and are intended to account for the inherent variation of measured or calculated values ​​that a person skilled in the art would recognize.

[0052] In this specification, terms such as first, second, third, etc. may be used to describe various elements, components, regions, layers, and / or sections, but these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Accordingly, the first element, component, region, layer, or section discussed below may be named the second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0053] Spatial relative terms such as "beneath," "below," "lower," "above," and "upper" may be used herein for ease of explanation to describe the relationship between one element or feature and another element(s) or feature(s) as illustrated in the drawings. Spatially relative positions are to be understood as encompassing different orientations of the device in use or operation, in addition to the orientations depicted in the figures. For example, if the device in the drawing is inverted, an element described as "below" or "below" is understood as "above" or "upper" of another element. Thus, the term "below" may encompass both the up and down directions.

[0054] The terms used in this specification are intended to describe the embodiments of the present disclosure and are not intended to limit the present disclosure.

[0055] FIG. 1 is a perspective view schematically showing the configuration of a battery pack according to one embodiment of the present invention.

[0056] Referring to FIG. 1, the battery pack according to the present embodiment may include a case (100), a battery cell (200), and a connection part (300).

[0057] The case (100) forms the general outline of the battery pack and can accommodate the battery cell (200). The case (100) can function as a component that supports the battery cell (200) and protects the battery cell (200) from external impacts and foreign substances.

[0058] The case (100) can provide a space to accommodate a battery cell (200) inside. A battery cell (200) can be placed inside the case (100).

[0059] The case (100) may include a plastic material. The case (100) may be manufactured by injection molding. The case (100) may include a case body (110) and a case cover (120).

[0060] The case body (110) may include a bottom portion (111), a front portion (112), a rear portion (113), a first side portion (114), and a second side portion (115).

[0061] The bottom portion (111) can form the lower (based on FIG. 1) exterior of the case body (110). For example, the bottom portion (111) can have the shape of a rectangular plate.

[0062] The front portion (112), rear portion (113), first side portion (114) and second side portion (115) can form the periphery surface of the case body (110).

[0063] The front portion (112), rear portion (113), first side portion (114) and second side portion (115) may have the shape of a plate extending upward from the edge of the bottom portion (111) (based on FIG. 1).

[0064] The front portion (112), rear portion (113), first side portion (114), and second side portion (115) may be arranged to surround the upper space of the bottom portion (111). For example, the front portion (112), rear portion (113), first side portion (114), and second side portion (115) may be arranged to form a rectangular cross-sectional shape.

[0065] The cross-sectional shape of the bottom part (111), front part (112), rear part (113), first side part (114) and second side part (115) is not limited to the square shape shown in FIG. 1, and can be designed to various shapes such as a circle, ellipse, or polygon.

[0066] The front portion (112) and the rear portion (113) may be positioned facing each other. The front portion (112) and the rear portion (113) may be positioned parallel to each other. The areas of the front portion (112) and the rear portion (113) may be equal to each other.

[0067] The first side section (114) and the second side section (115) may be arranged facing each other. The first side section (114) and the second side section (115) may be arranged parallel to each other. The areas of the first side section (114) and the second side section (115) may be equal to each other.

[0068] The case body (110) may be formed to have the shape of a box with a hollow interior and one side open. For example, the open side of the case body (110) may be positioned to face upward with respect to FIG. 1.

[0069] The case cover (120) is coupled to the case body (110) and can close the internal space of the case body (110). The case cover (120) can be formed to have a shape roughly like a plate. For example, the case cover (120) can have a shape of a rectangular plate.

[0070] The cross-sectional shape of the case cover (120) is not limited to the square shape shown in FIG. 1, and can be designed to various shapes such as a circle, ellipse, or polygon.

[0071] The case cover (120) can be fixed to the upper part of the case body (110) by various types of joining methods such as bolting, welding, and snap-fitting. Accordingly, the case (100) according to the present embodiment may have a shape of approximately a cuboid.

[0072] The battery cell (200) can function as a unit structure that stores and supplies power in a battery pack. The battery cell (200) can be placed inside the case (100).

[0073] A plurality of battery cells (200) may be provided. A plurality of battery cells (200) may be arranged in a plurality of rows inside the case (100). A plurality of battery cells (200) may be connected in series or in parallel by electrical connection means such as a bus bar.

[0074] In the following description, the battery cell (200) is described as a prismatic type as a lithium-ion secondary battery. However, the present invention is not limited thereto, and the battery cell (200) may be a lithium polymer battery or a cylindrical battery.

[0075] FIG. 2 is a perspective view of a case according to one embodiment of the present invention viewed from one direction, FIG. 3 is a perspective view of the case of FIG. 2 viewed from another direction, and FIG. 4 is a cross-sectional view of FIG. 2 cut along line IX-IX.

[0076] Referring to FIGS. 1 to 4, the connecting portion (300) may be integrally provided with the case (100). The connecting portion (300) may be insert injection molded into the case (100).

[0077] The connection part (300) can be connected to the battery cell (200). The connection part (300) is electrically connected to the battery cell (200) placed inside the case (100) via a wire, etc., and can be electrically connected to a power source, etc. placed outside the case (100).

[0078] In this embodiment, the connection part (300) is described as being provided on the case cover (120) of the case (100) as one embodiment, but is not limited thereto, and the connection part (300) may also be provided on the case body (110).

[0079] The case (100) may include a first surface (101) and a second surface (102) positioned to face in a direction opposite to the first surface (101).

[0080] The first surface (101) may be referred to as the upper surface of the case (100) positioned to face upward with respect to FIGS. 2 and FIGS. 3, and the second surface (102) may be referred to as the lower surface of the case (100) positioned to face downward with respect to FIGS. 2 and FIGS. 3.

[0081] The first direction described below may mean a direction parallel to the Z-axis with reference to FIGS. 2 and FIGS. 4, and a direction from the second surface (102) of the case (100) toward the first surface (101) of the case (100). The second direction may mean a direction parallel to the X-axis that intersects (orthogonally) the Z-axis with reference to FIGS. 2 and FIGS. 4, and a longitudinal direction of the case (100).

[0082] FIG. 5 is a perspective view schematically showing the configuration of a connection part according to one embodiment of the present invention, FIG. 6 is an exploded perspective view of a connection part according to one embodiment of the present invention viewed from one direction, and FIG. 7 is an exploded perspective view of the connection part of FIG. 6 viewed from another direction.

[0083] Referring to FIGS. 2 to 7, the connection part (300) may be provided with a bubble discharge part (400) through which bubbles generated during the insert injection molding process in the case (100) are discharged.

[0084] The connection part (300) may include a connection terminal (310) and a terminal holder (320).

[0085] The connection terminal (310) may include a metal material capable of conducting electricity. A bubble discharge portion (400) may be provided on the connection terminal (310). The connection terminal (310) may be rotatably coupled to a terminal holder (320).

[0086] A plurality of connection terminals (310) may be provided. A plurality of connection terminals (310) may be spaced apart along a direction parallel to the second direction in the terminal holder (320). At least two connection terminals (310) may be formed to have the same shape and volume. In another embodiment, two connection terminals (310) may be formed to have different volumes. For example, two connection terminals (310) may be formed to have the same overall shape but different diameters.

[0087] The connection terminal (310) may include a first connection socket (311), a second connection socket (312), and a connection plate (313).

[0088] The first connection socket (311) can be accommodated in the terminal holder (320). The first connection socket (311) can be inserted inside the terminal holder (320). The cross-section of the first connection socket (311) can be formed in a circular shape. The cross-sectional shape of the first connection socket (311) is not limited to this, and can be designed to have various shapes such as elliptical or polygonal.

[0089] The first connection socket (311) may be formed in a hollow shape with an empty interior. The interior of the first connection socket (311) may be formed by penetrating the central part of the first connection socket (311) in a direction parallel to the first direction.

[0090] The internal space of the first connection socket (311) can communicate with the second surface (102) of the case (100). Additionally, the interior of the first connection socket (311) can communicate with the exterior of the case (100) through the second surface (102) of the case (100).

[0091] The second connection socket (312) may extend from the first connection socket (311) along a first direction in which the first surface (101) of the case (100) is located. The cross-section of the second connection socket (312) may be formed in the same circular shape as the first connection socket (311). The cross-sectional shape of the second connection socket (312) is not limited to this, and can be designed to have various shapes such as an ellipse or a polygon.

[0092] The second connection socket (312) may be formed in a hollow shape with an empty interior, similar to the first connection socket (311). The internal space of the second connection socket (312) may be formed by penetrating the central part of the second connection socket (312) in a direction parallel to the first direction.

[0093] The interior of the first connection socket (311) and the interior of the second connection socket (312) can be connected to each other. To elaborate, the interior space of the first connection socket (311) and the interior space of the second connection socket (312) can be connected.

[0094] Referring to FIGS. 8 to 10, the outer diameter (D2) of the first connection socket (311) may be formed to be smaller than the outer diameter (D1) of the second connection socket (312). The inner diameter of the first connection socket (311) and the inner diameter of the second connection socket (312) may be the same.

[0095] The second connection socket (312) is not inserted into the inner side of the terminal holder (320) and may protrude in a first direction from the terminal holder (320). The second connection socket (312) may be exposed from the first surface (101) of the case (100).

[0096] The internal space of the second connection socket (312) can communicate with the first surface (101) of the case (100). Additionally, the interior of the second connection socket (312) can communicate with the exterior of the case (100) through the first surface (101) of the case (100).

[0097] The connection plate (313) may extend from the first connection socket (311) along a direction opposite to the first direction, which is the direction in which the second surface (102) of the case (100) is located. The connection plate (313) may be formed in a roughly plate shape.

[0098] The connection plate (313) can be accommodated in the terminal holder (320). The connection plate (313) can be inserted inside the terminal holder (320).

[0099] The connection plate (313) can be fixed to the terminal holder (320). As the connection plate (313) is fixed inside the terminal holder (320), the connection terminal (310) can be fixed to the terminal holder (320).

[0100] A plurality of connection plates (313) may be spaced apart along the circumferential direction of the first connection socket (311).

[0101] The connection plate (313) may be exposed from the second side (102) of the case (100). The connection plate (313) may include a first connection plate (313a) and a second connection plate (313b).

[0102] The first connection plate (313a) may extend from the first connection socket (311). The first connection plate (313a) may extend from the first connection socket (311) along a direction opposite to the first direction, which is the direction in which the second side (102) of the case (100) is located.

[0103] The second connection plate (313b) may extend from the first connection plate (313a) along a direction parallel to the second direction that intersects the first direction. The second connection plate (313b) may extend from the first connection plate (313a) radially along the first connection socket (311).

[0104] The second connection plate (313b) may be spaced apart from the second connection socket (312) along a direction opposite to the first direction. The second connection plate (313b) may face the second connection socket (312) at a spaced interval. Thus, a gap may be formed between the second connection socket (312) and the second connection plate (313b).

[0105] The terminal holder (320) can be rotatably coupled to the connection terminal (310). The terminal holder (320) may be made of a metal or plastic material. The terminal holder (320) may be exposed from the second side (102) of the case (100).

[0106] The terminal holder (320) may include a holder body part (321), a receiving part (322), a seating part (323), a locking projection part (324), and a slit hole part (325).

[0107] The holder body (321) can be formed to have a shape roughly like a plate. For example, the holder body (321) can have a rectangular plate shape. The cross-sectional shape of the holder body (321) is not limited to a rectangular shape, but can be designed to have various shapes such as a circle, an ellipse, or a polygon.

[0108] The receiving portion (322) is provided inside the holder body portion (321) and can provide a space to accommodate the connection terminal (310).

[0109] The receiving portion (322) may be formed by penetrating the holder body portion (321) in a direction parallel to the first direction. The first connection socket (311) and the connection plate (313) may be rotatably received in the receiving portion (322).

[0110] The seating portion (323) may be formed with a step from the outer surface of the holder body portion (321) in a direction opposite to the first direction, protruding from the inner surface of the receiving portion (322). A first connection socket (311) may be seated on the seating portion (323).

[0111] The catch portion (324) may be formed protruding from the inner surface of the receiving portion (322). The catch portion (324) may restrain the connecting plate (313) according to the rotational direction of the connecting plate (313) to position the connecting plate (313) in a caught position on the receiving portion (322).

[0112] When a connection plate (313) is inserted into the interior of the receiving portion (322) through the slit hole portion (325) described later, and the connection terminal (310) is rotated in one direction so that the connection plate (313) is positioned inside the locking projection portion (324), the second connection plate (313b) interferes with the locking projection portion (324) and cannot be removed from the receiving portion (322). Accordingly, the connection terminal (310) can be fixed to the holder body portion (321).

[0113] The slit hole portion (325) may be formed by being recessed into the catch portion (324). The slit hole portion (325) may be formed by cutting the catch portion (324) in a direction parallel to the second direction. The connection plate (313) may pass through the slit hole portion (325) depending on the rotational direction of the connection plate (313).

[0114] The lower part of the connection plate (313) is positioned to face the slit hole portion (325), and when the connection plate (313) passes through the slit hole portion (325), the connection plate (313) can be received inside the receiving portion (322).

[0115] When the connection plate (313) is inserted into the interior of the receiving portion (322) through the slit hole portion (325), and the connection terminal (310) is rotated in one direction so that the connection plate (313) is positioned inside the locking projection portion (324), the second connection plate (313b) interferes with the locking projection portion (324) and cannot be removed from the receiving portion (322). Therefore, the connection terminal (310) can be fixed to the holder body portion (321).

[0116] FIG. 8 is a cross-sectional view schematically showing a first embodiment of a connection terminal according to an embodiment of the present invention.

[0117] Referring to FIGS. 2 to 8, a bubble discharge section (400) may be provided in the connection terminal (310). The bubble discharge section (400) according to the present embodiment may be formed by penetrating the connection terminal (310) in a direction parallel to the first direction.

[0118] A plurality of bubble discharge sections (400) may be spaced apart along the circumferential direction of the connection terminal (310).

[0119] The bubble discharge section (400) may include a first bubble discharge section (410) and a second bubble discharge section (420).

[0120] The first bubble discharge section (410) can penetrate the first connection socket (311) in a direction parallel to the first direction. The first bubble discharge section (410) can be formed by being recessed on the outer surface of the first connection socket (311).

[0121] The first bubble discharge unit (410) may be located between the second connection socket (312) and the second connection plate (313b). Multiple first bubble discharge units (410) may be spaced apart along the circumferential direction of the first connection socket (311).

[0122] The second bubble discharge section (420) may be in communication with the first bubble discharge section (410). The second bubble discharge section (420) may be formed by penetrating the second connection socket (312) in a direction parallel to the first direction. Multiple second bubble discharge sections (420) may be spaced apart along the circumferential direction of the second connection socket (312).

[0123] In the insert injection molding process, where a connection terminal (310) is connected to a terminal holder (320) and resin is injected into the mold while the terminal holder (320) with the connection terminal (310) connected is placed inside the mold, the bubbles generated can pass through the first bubble discharge section (410) and the second bubble discharge section (420) in sequence and be discharged to the outside of the connection terminal (310).

[0124] FIG. 9 is a cross-sectional view schematically showing a second embodiment of a connection terminal according to an embodiment of the present invention.

[0125] Referring to FIGS. 2 through 7 and FIG. 9, a bubble discharge section (400) may be provided in the connection terminal (310). The bubble discharge section (400) according to the present embodiment may be formed by penetrating the connection terminal (310) in a direction inclined with respect to the first direction.

[0126] A plurality of bubble discharge sections (400) may be spaced apart along the circumferential direction of the connection terminal (310).

[0127] The bubble discharge section (400) may include a first bubble discharge section (410) and a second bubble discharge section (420).

[0128] The first bubble discharge section (410) can penetrate the first connection socket (311) in a direction inclined with respect to the first direction. The first bubble discharge section (410) can be formed as a recess on the outer surface of the first connection socket (311).

[0129] The first bubble discharge section (410) can be formed at a set angle from the edge of the first connection socket (311) toward the center of the first connection socket (311).

[0130] The first bubble discharge unit (410) may be located between the second connection socket (312) and the second connection plate (313b). Multiple first bubble discharge units (410) may be spaced apart along the circumferential direction of the first connection socket (311).

[0131] The second bubble discharge section (420) may be in communication with the first bubble discharge section (410). The second bubble discharge section (420) may be formed by penetrating the second connection socket (312) in a direction inclined with respect to the first direction. The second bubble discharge section (420) may be formed at a set angle inclined from the edge of the second connection socket (312) toward the center of the second connection socket (312).

[0132] A plurality of second bubble discharge sections (420) may be spaced apart along the circumferential direction of the second connection socket (312).

[0133] In the insert injection molding process, where a connection terminal (310) is connected to a terminal holder (320) and resin is injected into the mold while the terminal holder (320) with the connection terminal (310) connected is placed inside the mold, the bubbles generated can pass through the first bubble discharge section (410) and the second bubble discharge section (420) in sequence and be discharged to the outside of the connection terminal (310).

[0134] FIG. 10 is a cross-sectional view schematically showing a third embodiment of a connection terminal according to an embodiment of the present invention.

[0135] Referring to FIGS. 2 to 7 and FIG. 10, a bubble discharge section (400) may be provided in the connection terminal (310). The bubble discharge section (400) according to the present embodiment may be formed by penetrating the connection terminal (310) in a direction inclined with respect to the first direction.

[0136] A plurality of bubble discharge sections (400) may be spaced apart along the circumferential direction of the connection terminal (310).

[0137] The bubble discharge section (400) may include a first bubble discharge section (410) and a second bubble discharge section (420).

[0138] The first bubble discharge section (410) may penetrate the first connection socket (311) in a direction inclined with respect to the first direction. The first bubble discharge section (410) may be formed by being recessed on the outer surface of the first connection socket (311). The first bubble discharge section (410) may be formed at a set angle inclined from the center of the first connection socket (311) toward the edge of the first connection socket (311).

[0139] The first bubble discharge unit (410) may be located between the second connection socket (312) and the second connection plate (313b). Multiple first bubble discharge units (410) may be spaced apart along the circumferential direction of the first connection socket (311).

[0140] The second bubble discharge section (420) may be in communication with the first bubble discharge section (410). The second bubble discharge section (420) may be formed by penetrating the second connection socket (312) in a direction inclined with respect to the first direction.

[0141] The second bubble discharge section (420) may be formed at a set angle from the center of the second connection socket (312) toward the edge of the second connection socket (312). Multiple second bubble discharge sections (420) may be spaced apart along the circumferential direction of the second connection socket (312).

[0142] In the insert injection molding process, where a connection terminal (310) is connected to a terminal holder (320) and resin is injected into the mold while the terminal holder (320) with the connection terminal (310) connected is placed inside the mold, the bubbles generated can pass through the first bubble discharge section (410) and the second bubble discharge section (420) in sequence and be discharged to the outside of the connection terminal (310).

[0143] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom.

[0144] Therefore, the technical scope of protection of the present invention should be determined by the following patent claims.

Claims

1. Case; A plurality of battery cells disposed in the above case; and A connection portion that is insert injection molded into the above case and is connectable to the battery cell; comprising A battery pack characterized by the above-mentioned connection portion being provided with a bubble discharge portion for discharging bubbles generated during the injection molding process.

2. In Paragraph 1, The above connection part is, Connection terminal; and A battery pack characterized by including a terminal holder to which the above-mentioned connection terminal is rotatably coupled.

3. In Paragraph 2, A battery pack characterized in that the above connection terminal includes a metal material.

4. In Paragraph 2, The above bubble discharge unit is, A battery pack characterized by being formed by penetrating the above-mentioned connection terminal in a direction parallel to the first direction.

5. In Paragraph 2, The above bubble discharge unit is, A battery pack characterized by being formed by penetrating the above-mentioned connection terminal in a direction inclined with respect to the first direction.

6. In Paragraph 2, The above bubble discharge unit is, A battery pack characterized by having a plurality of connection terminals spaced apart along the circumferential direction of the above connection terminals.

7. In Paragraph 2, The above connection terminal is, A battery pack characterized by having a plurality of terminal holders spaced apart along a direction parallel to a second direction intersecting a first direction.

8. In Paragraph 2, The above connection terminal is, A first connection socket accommodated in the terminal holder above; A second connection socket extending along a first direction from the first connection socket; and A battery pack characterized by including a connection plate that extends from the first connection socket along a direction opposite to the first direction and is fixable to the terminal holder.

9. In Paragraph 8, A battery pack characterized in that the outer diameter of the first connection socket is smaller than the outer diameter of the second connection socket.

10. In Paragraph 8, A battery pack characterized in that the interior of the first connection socket and the interior of the second connection socket are in communication with each other.

11. In Paragraph 8, The above second connection socket is, A battery pack characterized by protruding in the first direction from the terminal holder and being exposed from the first surface of the case.

12. In Paragraph 8, The above connection plate and the above terminal holder are, A battery pack characterized by being exposed from a second surface of the case positioned to face in a direction opposite to the first surface of the case.

13. In Paragraph 8, The interior of the second connection socket is in communication with the first surface of the case, and A battery pack characterized in that the interior of the first connection socket communicates with the second surface of the case, which is positioned to face in a direction opposite to the first surface.

14. In Paragraph 8, The above connection plate is, A battery pack characterized by having a plurality of sockets spaced apart along the circumferential direction of the first connection socket.

15. In Paragraph 8, The above connection plate is, A first connection plate extending from the first connection socket; and A battery pack characterized by including: a second connection plate extending from the first connection plate along a direction parallel to the second direction intersecting the first direction, and facing the second connection socket at a spaced interval.

16. In Paragraph 8, The above bubble discharge unit is, A first bubble discharge portion formed by being recessed on the outer surface of the first connection socket; and A battery pack characterized by including a second bubble discharge section that communicates with the first bubble discharge section and penetrates the second connection socket.

17. In Paragraph 8, The above terminal holder is, Holder body part; and A battery pack characterized by including: a receiving portion formed by penetrating the holder body portion in a direction parallel to the first direction, and wherein the first connection socket and the connection plate are rotatably received.

18. In Paragraph 17, The above terminal holder is, A battery pack further comprising: a seating portion protruding from the inner surface of the receiving portion and formed with a step from the outer surface of the holder body portion, on which the first connection socket is seated.

19. In Paragraph 17, The above terminal holder is, A battery pack further comprising: a locking projection formed protruding from the inner surface of the receiving portion and restraining the connecting plate according to the rotational direction of the connecting plate to position it in a locking position in the receiving portion.

20. In Paragraph 19, The above terminal holder is, A battery pack further comprising: a slit hole portion formed by being recessed in the above-mentioned stopper portion, through which the connection plate passes according to the rotational direction of the connection plate.

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