Battery pack

Abstract

A battery pack includes: a base plate in which two or more battery cells are in contact with a first surface of the base plate and a base flow path through which a refrigerant cooling the battery cells circulates is in the base plate; and a frame portion in which two or more frames are coupled to each other on an upper side of the first surface of the base plate to form an accommodating space for accommodating the battery cells, and formed therein by a side surface flow path connected to the base flow path through which the refrigerant flows in and out.

Description

Technical Field

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

[0002] Generally speaking, secondary batteries (or rechargeable batteries) are widely used in mobile devices, auxiliary power devices, and the like.

[0003] In addition, secondary batteries are also attracting attention as a main power source for electric vehicles, hybrid electric vehicles (eg, plug-in hybrid electric vehicles), and the like, which have been proposed as alternatives for solving various problems such as air pollution of conventional gasoline or diesel vehicles.

[0004] In electric vehicles and the like, a battery pack is formed by stacking a plurality of battery cells and then electrically connecting the battery cells in series and / or in parallel to achieve a high-output and large-capacity battery.

[0005] A plurality of battery cells are stacked in a battery pack, and terminals exposed at both ends of each battery cell are electrically connected to provide a high voltage.

[0006] However, a battery pack generating a high voltage requires more efficient cooling of the battery cells to improve driving stability during continuous use of the battery pack.

[0007] The above information disclosed in the art serving as background of the present disclosure is merely for improving understanding of the background of the present disclosure and therefore may include information that does not constitute related art. Summary of the invention

[0008] Embodiments of the present disclosure are directed to a battery pack capable of cooling three surfaces of a plurality of battery cells accommodated in a frame portion to provide more efficient cooling of the battery cells.

[0009] In one embodiment, the battery pack includes: a battery cell; a base plate including a first surface and a base flow path, wherein the battery cell contacts the first surface, and the base flow path is configured to circulate a refrigerant to cool the battery cell; and a frame portion including frames coupled to each other on an upper side of the first surface of the base plate. The frame portion has an accommodation space for accommodating the battery cell and a side surface flow path connected to the base flow path, and the refrigerant is configured to flow through the side surface flow path.

[0010] The base plate may include: a cooling plate including the first surface and the base flow path; a flow path connecting portion coupled to one end of the cooling plate and connecting the side surface flow path of the frame portion and the base flow path; and a refrigerant guide portion coupled to the other end of the cooling plate. The refrigerant guide portion is configured to guide the refrigerant introduced into the base flow path to flow through the flow path connecting portion in a discharge direction.

[0011] The base flow path may include an inlet flow path and an outlet flow path, the refrigerant introduced through the flow path connecting portion moving through the inlet flow path in a first direction inside the cooling plate, in the outlet flow path, the flow direction of the refrigerant introduced through the inlet flow path is reversed at the position of the refrigerant guide portion to move in a second direction opposite to the first direction, the inlet flow path extends along the first direction inside the cooling plate to introduce the refrigerant, and is connected to the outlet flow path at the position of the refrigerant guide portion, and the outlet flow path is connected to the inlet flow path inside the cooling plate.

[0012] The battery pack may include a first coupling groove coupled to the flow path connection portion at the one end of the cooling plate. The first coupling groove opens a portion of each of the inflow flow path and the exhaust flow path.

[0013] The flow path connecting portion may include: a first connecting portion, connected to the one end of the cooling plate to connect the inflow flow path to the side surface flow path of the frame portion; and a second connecting portion, connected to the one end of the cooling plate to connect the exhaust flow path to the side surface flow path of the frame portion.

[0014] The first connection portion may include: a first bent plate including one side covering the first coupling groove and the other side extending in the thickness direction of the cooling plate; and a first pipeline protruding from an upper side of the first bent plate, extending into the frame portion, and connecting the inflow flow path and the side surface flow path. The second connection portion may include: a second bent plate including one side covering the first coupling groove and the other side extending in the thickness direction of the cooling plate; and a second pipeline protruding from an upper side of the second bent plate, extending into the frame portion, and connecting the exhaust flow path and the side surface flow path.

[0015] The battery pack may include a second coupling groove at the other end of the cooling plate. The second coupling groove is coupled to the refrigerant guide portion and opens another portion of each of the inflow flow path and the exhaust flow path.

[0016] The refrigerant guide portion may include a second bent plate including one side covering the second coupling groove and the other side extending in a thickness direction of the cooling plate.

[0017] The frame portion may include: a composite frame connected to one edge of the base plate, wherein a first side surface flow path is inside the composite frame, and the first side surface flow path is connected to the first connecting portion and the second connecting portion to supply the refrigerant; an end frame connected to the other edge of the base plate; a first side frame, both ends of the first side frame are respectively connected to one end of each of the composite frame and the end frame; and a second side frame, both ends of the second side frame are respectively connected to the other end of each of the composite frame and the end frame.

[0018] The battery pack may include: a gas exhaust portion in the composite frame configured to exhaust gas generated from one of the battery cells, wherein the gas exhaust portion includes: a gas inflow portion, which is on a first side surface of the composite frame and through which the gas generated from the one of the battery cells is introduced; and a gas exhaust portion, at the composite frame, through which the gas introduced into the gas inflow portion is discharged to the outside.

[0019] The interior of the composite frame may be divided into a first region and a second region, wherein the first side surface flow path is at the first region, and wherein the gas discharge portion is at the second region.

[0020] The gas discharge portion may include: a discharge unit protruding from a second side surface of the composite frame facing the first side surface; and a guide portion protruding from an inner wall surface of the second region inside the composite frame. The discharge unit is configured to discharge the gas, and the guide portion is configured to guide the gas toward the discharge unit.

[0021] The frame portion may include a side surface cooling frame in contact with side surfaces of the plurality of battery cells.

[0022] One side of the side surface cooling frame may be connected to the first side surface flow path of the composite frame, wherein the other side of the side surface cooling frame extends in a direction toward the end frame, and wherein a second side surface flow path through which the refrigerant flows is inside the side surface cooling frame.

[0023] The first side surface flow path may include an upper flow path connected to the first pipeline and a lower flow path connected to the second pipeline, and the second side surface flow path may include: an upper flow path on the side surface, extending in the length direction inside the side surface cooling frame and connected to the upper flow path of the composite frame; and a lower flow path on the side surface, extending in the length direction inside the side surface cooling frame and below the flow path on the side surface to be connected to the lower flow path of the composite frame.

[0024] The battery pack may include a side surface refrigerant guide portion at the other side of the side surface cooling frame, wherein the side surface refrigerant guide portion is configured to change a flow direction of the refrigerant flowing through the upper flow path on the side surface to a direction of the lower flow path on the side surface.

[0025] The inflow flow path may include: a first inflow flow path, extending along the first direction at one side of the cooling plate to introduce the refrigerant and connected to the exhaust flow path; and a second inflow flow path, extending along the first direction at the other side of the cooling plate to introduce the refrigerant and connected to the exhaust flow path, and wherein the exhaust flow path includes: a first exhaust flow path, extending along the first direction between the first inflow flow path and the second inflow flow path inside the cooling plate and connected to the first inflow flow path to exhaust the refrigerant; and a second exhaust flow path, extending along the first direction between the first inflow flow path and the second inflow flow path inside the cooling plate and connected to the second inflow flow path to exhaust the refrigerant.

[0026] The flow path connecting portion may include: a first connecting portion, connected to the one end of the cooling plate to connect the first inflow flow path and the second inflow flow path to the side surface flow path of the frame portion; and a second connecting portion, connected to the one end of the cooling plate to connect the first exhaust flow path and the second exhaust flow path to the side surface flow path of the frame portion.

[0027] The inflow flow path may include: a first inflow flow path extending along the first direction inside one edge portion of the cooling plate so that the refrigerant is introduced and connected to the exhaust flow path; a second inflow flow path extending along the first direction inside the edge portion of the other side of the cooling plate so that the refrigerant is introduced and connected to the exhaust flow path; and a common inflow flow path including two flow paths extending along the first direction inside the cooling plate between the first inflow flow path and the second inflow flow path and connected to the exhaust flow path. The exhaust flow path may include: a first common exhaust flow path extending along the first direction inside the cooling plate between the first inflow flow path and the common inflow flow path and connected to each of the first inflow flow path and the common inflow flow path to exhaust the refrigerant; and a second common exhaust flow path extending along the first direction inside the cooling plate between the second inflow flow path and the common inflow flow path and connected to each of the second inflow flow path and the common inflow flow path to exhaust the refrigerant.

[0028] The flow path connecting portion may include: a first connecting portion, connected to the one end of the cooling plate to connect the first inflow flow path, the second inflow flow path and the common inflow flow path to the side surface flow path of the frame portion; and a second connecting portion, connected to the one end of the cooling plate to connect the first common exhaust flow path and the second common exhaust flow path to the side surface flow path of the frame portion.

[0029] According to an embodiment of the present disclosure, in a state where a plurality of battery cells including a battery cell are accommodated in a frame portion, three surfaces of the bottom and side surfaces of the battery cell can be effectively cooled. Cooling the battery cell is configured to extend the service life of the battery pack and improve the durability of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 FIG. 1 is a perspective view schematically showing a battery pack according to a first embodiment of the present disclosure.

[0031] Figure 2 To schematically illustrate Figure 1 An exploded perspective view of the battery pack.

[0032] Figure 3 FIG. 1 is an exploded perspective view schematically showing a main part of a base plate according to a first embodiment of the present disclosure.

[0033] Figure 4 To schematically illustrate Figure 3 Plan view of the base plate.

[0034] Figure 5 1 is a perspective view schematically showing a flow path connecting portion according to a first embodiment of the present disclosure.

[0035] Figure 6 is a perspective view schematically showing a refrigerant guide portion according to a first embodiment of the present disclosure.

[0036] Figure 7 FIG. 1 is a cross-sectional view schematically showing a composite frame according to a first embodiment of the present disclosure.

[0037] Figure 8 For installation along the composite frame Figure 1 A cross-sectional view taken along line AA.

[0038] Fig. 9 For along Figure 1 A cross-sectional view taken along line BB.

[0039] Fig.10 FIG. 1 is a perspective view schematically showing a side surface cooling frame according to a first embodiment of the present disclosure.

[0040] Fig.11 To schematically illustrate Fig.10 An exploded perspective view of main parts of a state in which a first plug, a second plug, and a side surface refrigerant guide portion of a side surface cooling frame are separated.

[0041] Fig.12 To schematically illustrate Fig.10 Cross-sectional view of the side surface cooling frame.

[0042] Fig.13 FIG. 1 is a perspective view schematically showing a battery pack according to a second embodiment of the present disclosure.

[0043] Fig.14 To schematically illustrate Fig.13 An exploded perspective view of the battery pack.

[0044] Fig.15 To schematically illustrate Fig.13 Plan view of the base plate.

[0045] Fig.16 For along Fig.13 A main part sectional view taken along line CC of FIG. 1 and schematically showing a state in which the composite frame and the base plate are connected by the flow path connecting portion.

[0046] Fig.17 For along Fig.13A cross-sectional view of the main parts taken along line DD.

[0047] Fig.18 FIG. 4 is a perspective view schematically showing a battery pack according to a third embodiment of the present disclosure.

[0048] Fig.19 To schematically illustrate Fig.18 An exploded perspective view of the battery pack.

[0049] Fig. 20 To schematically illustrate Fig.18 Plan view of the base plate.

[0050] Fig.21 For along Fig.18 A main portion sectional view taken along line FF schematically illustrates a state in which the composite frame and the base plate are connected via a flow path connecting portion.

[0051] Fig. 22 For along Fig.18 A cross-sectional view of the main parts taken along line EE. DETAILED DESCRIPTION

[0052] The present disclosure will be described more fully hereinafter with reference to the accompanying drawings showing embodiments of the present disclosure. As will be appreciated by those skilled in the art, the described embodiments can be modified in various ways without departing from the spirit or scope of the present disclosure. The accompanying drawings and description should be regarded as illustrative and non-restrictive in nature. Throughout the specification, the same reference numerals indicate the same elements.

[0053] Figure 1 is a perspective view schematically showing a battery pack according to a first embodiment of the present disclosure, and Figure 2 To schematically illustrate Figure 1 An exploded perspective view of the battery pack.

[0054] like Figure 1 and Figure 2 As shown in , the battery pack 100 according to the first embodiment of the present disclosure may include a base plate 10 in which a plurality of battery cells 11 are in contact with a first surface and a base flow path 20 through which a refrigerant that cools the battery cells 11 circulates. The battery pack 100 further includes a frame portion 30 in which a plurality of frames are coupled to each other on an upper side of the first surface of the base plate 10 to form an accommodation space for accommodating the battery cells 11. The frame portion 30 includes a side surface flow path connected to the base flow path 20 through which the refrigerant flows in and out.

[0055] The plurality of battery cells 11 may include a secondary battery configured to repeatedly perform charging and discharging operations.

[0056] The plurality of battery cells 11 may be accommodated within the frame portion 30 in a state in which a lower surface of each of the battery cells 11 is in contact with a first surface that is an upper surface of the base plate 10 .

[0057] The plurality of battery cells 11 may be cooled to an appropriate temperature by the refrigerant flowing along the base plate flow path 20 formed inside the base plate 10 while the lower surface of each of the battery cells 11 is supported by the base plate 10 .

[0058] Figure 3 2 is an exploded perspective view schematically showing a base plate 10 according to a first embodiment of the present disclosure. Figure 4 To schematically illustrate Figure 3 The plan view of the base plate, Figure 5 is a perspective view schematically showing a flow path connection portion according to a first embodiment of the present disclosure, and Figure 6 is a perspective view schematically showing a refrigerant guide portion according to a first embodiment of the present disclosure.

[0059] refer to Figures 3 to 6 The base plate 10 may include a cooling plate 12, wherein a plurality of battery cells 11 are in contact with a first surface and form a base flow path 20. The flow path connection portion 14 is coupled to one end of the cooling plate 12 and is connected to a first side surface flow path 311 of the frame portion 30 (see Figure 7-Figure 8 ) and the base flow path 20. The refrigerant guide portion 16 is coupled to the other end of the cooling plate 12, and is configured to guide the refrigerant introduced into the base flow path 20 to flow through the flow path connecting portion 14 in a discharge direction.

[0060] The cooling plate 12 may have a rectangular planar shape having a length in a first direction (y-axis direction) to support a plurality of battery cells 11 arranged in the first direction on a first surface of the cooling plate 12. The shape of the cooling plate 12 is not necessarily limited to a rectangular planar shape, and may have any other appropriate shape according to the number and arrangement of the battery cells 11.

[0061] A base flow path 20 for cooling the battery cells 11 may be inside the cooling plate 12 .

[0062] The base flow path 20 may include: an inflow flow path 21, through which the refrigerant flows inward (or is introduced) through the flow path connecting portion 14 and flows in a first direction (y-axis direction) inside the cooling plate 12; and an exhaust flow path 23, through which the refrigerant is discharged by converting the flow direction of the refrigerant at the position of the refrigerant guide portion 16.

[0063] The inflow flow path 21 may be inside the cooling plate 12 and have a length direction along one edge of the cooling plate 12 .

[0064] The inflow flow path 21 may be a single flow path inside the cooling plate 12 , and may be configured such that the refrigerant C flowing in through a flow path connection portion 14 (to be described later) flows in a first direction.

[0065] In one or more embodiments, Figure 4 The refrigerant C may be supplied to the inside of the inflow flow path 21 through the flow path connection portion 14 at one end of the cooling plate 12. The configuration of the flow path connection portion 14 according to one embodiment will be described in more detail below.

[0066] The inflow flow path 21 may be connected to the exhaust flow path 23 inside the cooling plate 12 to ensure circulation of the refrigerant C.

[0067] The exhaust flow path 23 may be connected to the inflow flow path 21 at the other end of the cooling plate 12 , and may be connected to the inflow flow path 21 at the position of the refrigerant guide portion 16 at the other end of the cooling plate 12 .

[0068] In one or more embodiments, the refrigerant C may be introduced through the inflow flow path 21 , and the flow of the refrigerant C may change direction at the location of the refrigerant guide portion 16 such that the refrigerant C is discharged through the discharge flow path 23 .

[0069] The flow path connection portion 14 may be coupled to one end of the cooling plate 12 .

[0070] The flow path connection portion 14 may be coupled to one end of the cooling plate 12 to connect the inflow flow path 21 and the exhaust flow path 23 of the cooling plate 12 to the first side surface flow path 311 of the frame portion 30 (see FIG. 1 ). Figure 7-Figure 8 ).

[0071] In one or more embodiments, the flow path connecting portion 14 may include a first connecting portion 141 and a second connecting portion 143, the first connecting portion 141 being connected to one end of the cooling plate 12 to connect the inflow flow path 21 to the first side surface flow path 311 of the frame portion 30, and the second connecting portion 143 being connected to the same end of the cooling plate 12 to connect the exhaust flow path 23 to the first side surface flow path 311 of the frame portion 30.

[0072] The first coupling groove 12a (see Figure 3 ) may be at one end of the cooling plate 12 to connect the first connection portion 141 and the second connection portion 143 .

[0073] The first coupling groove 12 a may be configured such that a portion of an end portion of each of the inflow flow path 21 and the exhaust flow path 23 is opened upward (eg, in the Z-axis direction).

[0074] The first connection portion 141 may include a first bent plate 141 a covering the first coupling groove 12 a and a first pipeline 141 b protruding upward from the first bent plate 141 a to be connected to the first side surface flow path 311 of the composite frame 31 .

[0075] One side of the first bent plate 141a may cover the first coupling groove 12a, and the other side of the first bent plate 141a may be bent to extend in the thickness direction (downward in the Z-axis direction) of the cooling plate 12. The first bent plate 141a may be coupled to the first coupling groove 12a by a fastening member, an adhesive, or the like.

[0076] The first pipeline 141b may protrude upward from an upper portion of the first bent plate 141a.

[0077] The first pipeline 141b may protrude upward from the upper portion of the first bent plate 141a to be connected to the first side surface flow path 311 in the composite frame 31 of the frame portion 30. The first side surface flow path 311 may include an upper flow path 311a and a lower flow path 311b, and the first pipeline 141b may be connected to the upper flow path 311a. This will be described in more detail below with respect to the description of the frame portion 30.

[0078] In one or more embodiments, the first pipeline 141b may be connected to the first side surface flow path 311 in the composite frame 31 of the frame portion 30 (which will be described later) so that the refrigerant C flowing along the first side surface flow path 311 is stably connected to the inflow flow path 21 inside the cooling plate 12.

[0079] The first sealing member 141c may be at an outer surface of the first pipeline 141b.

[0080] The first sealing member 141c may be outside the first pipeline 141b to prevent (or at least mitigate) leakage of the refrigerant C to the outside.

[0081] The first sealing member 141c may include a plurality of first sealing members on the outer surface of the first pipeline 141b.

[0082] In one or more embodiments, the first sealing member 141c may include a pair of first sealing members at positions spaced apart from each other (e.g., at an upper position and a lower position of the first pipeline 141b). In embodiments where the first sealing member 141c includes a pair of first sealing members at an upper position and a lower position of the first pipeline 141b and the length of the first pipeline 141b is longer than the length of the second pipeline 143b, the refrigerant C may be more effectively prevented from leaking to the outside.

[0083] In one or more embodiments, the second connection portion 143 may be coupled at one end of the cooling plate 12 (eg, the same end of the cooling plate 12 as the first connection portion) to connect the exhaust flow path 23 to the first side surface flow path 311 of the frame portion 30 .

[0084] The second connection portion 143 may include a second bent plate 143 a covering the first coupling groove 12 a at the exhaust flow path 23 , and a second pipeline 143 b protruding upward from the second bent plate 143 a to be connected to the first side surface flow path 311 .

[0085] One side of the second bent plate 143a may cover the first coupling groove 12a formed at the exhaust flow path 23, and the other side of the second bent plate 143a may be bent to extend in the thickness direction (downward in the Z-axis direction) of the cooling plate 12. The second bent plate 143a may be coupled to the first coupling groove 12a by a fastening member, an adhesive, or the like.

[0086] The second pipeline 143b may protrude upward from the upper portion of the second bent plate 143a to be connected to the first side surface flow path 311 in the composite frame 31 of the frame portion 30. The first side surface flow path 311 may include an upper flow path 311a and a lower flow path 311b, and the second pipeline 143b may be connected to the lower flow path 311b. This will be described in more detail below with respect to the description of the frame portion 30.

[0087] The second sealing member 143c may be a single piece on the outer surface of the second pipeline 143b. In embodiments where the first pipeline 141b has a length longer than that of the second pipeline 143b, the second sealing member 143c may be a single piece on the outer surface of the second pipeline 143b to prevent (or at least mitigate) leakage of the refrigerant C.

[0088] In one or more embodiments, the refrigerant C may be circulated and supplied from the frame portion 30 toward the cooling plate 12 through the flow path connection portion 14 including the first connection portion 141 and the second connection portion 143 (closed loop).

[0089] In one or more embodiments, the refrigerant C may be introduced through the inflow flow path 21 to be circulated and discharged through the exhaust flow path 23, and the refrigerant guide portion 16 may be located at a connection portion (eg, a junction) of the inflow flow path 21 and the exhaust flow path 23 for circulation supply.

[0090] In one or more embodiments, the second coupling groove 12b (see FIG. 14 ) coupled to the refrigerant guide portion 16 by opening or exposing a portion of the inflow flow path 21 and a portion of the exhaust flow path 23. Figure 3 ) may be located at the other end (ie, the opposite end) of the cooling plate 12.

[0091] One side of the refrigerant guide portion 16 may cover the second coupling groove 12 b , and the other side of the refrigerant guide portion 16 may be bent to function as (or be applied as) a third bent plate extending in the thickness direction (Z-axis direction) of the cooling plate 12 .

[0092] The third bending plate may be coupled to the second coupling groove 12 b at an end portion of the cooling plate 12 opposite to the first coupling groove 12 a , and may be coupled to the second coupling groove 12 b at each of the inflow flow path 21 and the exhaust flow path 23 .

[0093] In one or more embodiments, as the refrigerant moves through the inflow flow path 21 , the refrigerant may hit the third bending plate, so that the flow direction of the refrigerant changes. Therefore, the refrigerant may stably move in the direction of the exhaust flow path 23 .

[0094] In one or more embodiments, the frame portion 30 may be coupled to an upper portion of the base plate 10 to accommodate the plurality of battery cells 11 .

[0095] In one or more embodiments, the frame portion 30 may include a composite frame 31, an end frame 33, and a first side frame 35 and a second side frame 37 respectively connecting the composite frame 31 and the end frame 33. Each of the composite frame 31, the end frame 33, the first side frame 35 and the second side frame 37 is connected to the upper portion of the base plate 10.

[0096] Figure 7 2 is a cross-sectional view schematically showing a composite frame 31 according to a first embodiment of the present disclosure. Figure 8 For installing the composite frame 31 along Figure 1 A cross-sectional view taken along line AA of Fig. 9 For along Figure 1 A cross-sectional view taken along line BB.

[0097] like Figures 7 to 9As shown in , the composite frame 31 can be connected to one edge of the base plate 10, and the first side surface flow path 311 can be inside the composite frame 31 to connect to the first connection portion 141 and the second connection portion 143, so that the first side surface flow path 311 is configured to supply refrigerant.

[0098] The first side surface flow path 311 may be inside the composite frame 31 to supply the refrigerant to the first connection portion 141 and the second connection portion 143 .

[0099] The first side surface flow path 311 may include an upper flow path 311 a connected to the first pipeline 141 b and a lower flow path 311 b connected to the second pipeline 143 b .

[0100] The upper flow path 311a may be a portion configured to introduce refrigerant (or coolant), and may be formed by dividing (or partitioning) a portion of the inside of the composite frame 31. The upper flow path 311a may be connected to the first line 141b to enable supply of refrigerant.

[0101] The lower flow path 311 b may be below the upper flow path 311 a inside the composite frame 31 , and may be configured to provide a space through which the refrigerant flowing along the exhaust flow path 23 may be exhausted.

[0102] In one or more embodiments, a gas exhaust portion 313 for exhausting gas generated from the battery cells 11 may be inside the composite frame 31 .

[0103] The gas exhaust portion 313 may include: a gas inflow portion 312, which is on the first side surface of the composite frame 31 and through which the gas generated from the battery cell 11 is introduced; and a gas exhaust portion 314, which is at the composite frame 31 and through which the gas introduced through the gas inflow portion 312 is discharged to the outside.

[0104] The gas inflow portion 312 may be at a first side surface where one of the battery cells 11 contacts an upper side surface of the first side surface flow path 311 in the composite frame 31 , and may be a gas inflow hole passing through a portion of the first side surface.

[0105] The interior of the composite frame 31 can be divided into a first area "a" and a second area "b". Figure 7 The first side surface flow path 311 may be at the first region "a", and the gas discharge portion 314 may be at the second region "b".

[0106] The gas discharge portion 314 may include a discharge unit (or discharge portion) 315 protruding from a second side surface of the composite frame 31 facing the first side surface to discharge the gas, and a guide portion (or guide portion) 316 protruding from an inner wall surface of the second region b inside the composite frame 31 to guide the gas toward the discharge unit 315. The guide portion 316 may be around (e.g., surround) the discharge unit 315.

[0107] The discharge unit 315 may be detachably coupled to the second side surface of the composite frame 31 , and may be configured such that the gas discharged from the battery cells 11 and introduced into the gas inflow portion 312 may be easily discharged to the outside.

[0108] The discharge unit 315 may include a discharge body 315 a coupled to the second side surface of the composite frame 31 and a discharge protrusion portion 315 b protruding from the side surface of the discharge body 315 a into the second region b and having a discharge flow path formed therein.

[0109] The gas introduced through the gas inflow portion 312 may be guided by the guide portion 316 to pass through the discharge protrusion portion 315 b , so that the gas is discharged to the outside.

[0110] The guide portion 316 may protrude inside the composite frame 31 at a location where the discharge unit 315 is located.

[0111] The guide portion 316 may obliquely protrude from the inner wall surface of the composite frame 31 into the second region b at a position where the discharge unit 315 is located. The guide portion 316 is configured to allow the gas introduced through the gas inflow portion 312 to easily move to the discharge unit 315 .

[0112] The guide portion 316 may protrude from the inner wall surface of the composite frame 31, and the discharge protrusion 315b is inside the guide portion 316. The guide portion 316 may be or include a tapered guide protrusion having an open end portion. The guide portion 316 may taper in a direction extending away from the inner wall surface of the composite frame 31 where the discharge unit 315 is located.

[0113] In one or more embodiments, the end frame 33 may be coupled to another edge of the base plate 10 .

[0114] The first side frame 35 may be configured such that both ends of the first side frame 35 are connected to one end of each of the composite frame 31 and the end frame 33 .

[0115] Both ends of the second side frame 37 may be connected to the other end of each of the composite frame 31 and the end frame 33 .

[0116] In one or more embodiments, a side surface cooling frame 40 in contact with side surfaces of the plurality of battery cells 11 may be provided along at least a portion of the frame portion 30 .

[0117] Fig.10 2 is a perspective view schematically showing a side surface cooling frame 40 according to a first embodiment of the present disclosure. Fig.11 To schematically illustrate Fig.10 An exploded perspective view of a state in which the first plug, the second plug, and the side surface refrigerant guide portion of the side surface cooling frame 40 are separated, and Fig.12 To schematically illustrate Fig.10 sectional view of the side surface cooling frame 40.

[0118] like Figures 1 to 12 As shown in , the assembly may include a plurality of side surface cooling frames 40 spaced apart from each other at the frame portion 30 , and the side surface cooling frames 40 may be configured to cool the battery cells 11 by contacting side surfaces of the plurality of battery cells 11 accommodated within the frame portion 30 .

[0119] One side of the side surface cooling frame 40 may be connected to the first side surface flow path 311 of the composite frame 31 , the other side of the side surface cooling frame 40 may extend in a direction toward the end frame 33 , and the second side surface flow path 41 through which the refrigerant flows may be inside the side surface cooling frame 40 .

[0120] The second side surface flow path 41 may include an upper flow path 41a on the side surface and a lower flow path 41b on the side surface, wherein the flow path 41a on the side surface extends in the length direction (y-axis direction) inside the side surface cooling frame 40 and is connected to the upper flow path 311a of the composite frame 31, and the lower flow path 41b on the side surface extends in the length direction (y-axis direction) inside the side surface cooling frame 40 and below the flow path 41a on the side surface to be connected to the lower flow path 311b of the composite frame 31.

[0121] In one or more embodiments, the refrigerant may be supplied from the frame portion 30 to the side surface upper flow path 41 a to circulate in the side surface lower flow path 41 b .

[0122] A first plug 43 connecting the side surface upper flow path 41a to the upper flow path 311a of the composite frame 31 and a second plug 45 connecting the side surface lower flow path 41b to the lower flow path 311b of the composite frame 31 may be installed at one side of the side surface cooling frame 40 .

[0123] The first plug 43 may pass through the side surface of the composite frame 31 to connect to the upper flow path 311a. In one or more embodiments, the refrigerant flowing along the upper flow path 311a of the composite frame 31 may be introduced into the upper flow path 41a on the side surface of the side surface cooling frame 40 through the first plug 43.

[0124] The second plug 45 may pass through the side surface of the composite frame 31 to be connected to the lower flow path 311b. In one or more embodiments, the refrigerant flowing through the side surface lower flow path 41b may be introduced into the lower flow path 311b through the second plug 45.

[0125] In one or more embodiments, the side surface refrigerant guide portion 47 may be at the other side of the side surface cooling frame 40 .

[0126] The side surface refrigerant guide portion 47 may be coupled to the other side of the side surface cooling frame 40 as a plate shape, and may be configured to contact each of the side surface upper flow path 41 a and the side surface lower flow path 41 b .

[0127] In one or more embodiments, the refrigerant may be introduced from the side surface upper flow path 41a to hit the side surface refrigerant guide portion 47 so that the flow direction of the refrigerant is changed. In this way, the refrigerant may circulate to the side surface lower flow path 41b.

[0128] As described above, in a configuration in which a plurality of battery cells 11 including a battery cell are accommodated in the frame portion 30, the battery pack 100 of the present embodiment can effectively cool three surfaces of the bottom and side surfaces of the battery cell 11. Cooling the battery cell 11 is configured to extend the service life of the battery pack and improve the durability of the battery pack.

[0129] Fig.13 2 is a perspective view schematically showing a battery pack according to a second embodiment of the present disclosure. Fig.14 To schematically illustrate Fig.13 An exploded perspective view of the battery pack, and Fig.15 To schematically illustrate Fig.13 Plan view of the base plate. Figures 1 to 12 The same reference numerals as those in the figure represent the same or similar components having the same or similar functions. Detailed description of the same reference numerals will be omitted hereinafter.

[0130] like Figure 13 to Figure 15As shown in FIG. 1 , the base plate 110 of the battery pack 200 according to the second embodiment of the present disclosure may include a cooling plate 112, wherein a plurality of battery cells 11 are in contact with a first surface of the cooling plate 112. The base flow path 120 is formed in the cooling plate 112. The flow path connecting portion 114 is coupled to one end of the cooling plate 112 and is connected to the first side surface flow path 311 (see FIG. 1 ) of the frame portion 30. Fig.16 ) and the base flow path 120. The refrigerant guide portion 16 is coupled to the other end of the cooling plate 112, and is configured to guide the refrigerant introduced into the base flow path 120 to flow through the flow path connection portion 114 in a discharge direction.

[0131] The base flow path 120 may include an inflow flow path 121 through which the refrigerant flows (or is introduced) inwardly through the flow path connection portion 114 and flows in a first direction (e.g., y-axis direction) inside the cooling plate 112. The base flow path 120 also includes an exhaust flow path 123, in which the flow direction of the refrigerant introduced through the inflow flow path 121 is changed at the position of the refrigerant guide portion 16 to move in a second direction, which is the reverse direction (i.e., the opposite direction) of the first direction.

[0132] The inflow flow path 121 may include a first inflow flow path 121a extending along a first direction inside one side of the cooling plate 112 to introduce refrigerant and connected to the exhaust flow path 123, and a second inflow flow path 121b extending along the first direction inside the other side of the cooling plate 112 to introduce refrigerant and connected to the exhaust flow path 123.

[0133] The first inflow flow path 121a may extend along one edge of the cooling plate 112, may be longitudinally arranged along a first direction inside the cooling plate 112, and may be configured such that refrigerant introduced through the flow path connection portion 114 flows along the first direction (ie, y-axis direction).

[0134] The first inflow flow path 121 a may be connected to the exhaust flow path 123 inside the cooling plate 112 to enable the refrigerant C to circulate.

[0135] The second inflow flow path 121 b may extend along the other edge of the cooling plate 112 , may be longitudinally arranged along the first direction inside the cooling plate 112 , and may be configured such that the refrigerant introduced through the flow path connection portion 114 flows along the first direction.

[0136] The second inflow flow path 121 b may be connected to the exhaust flow path 123 inside the cooling plate 112 to enable the refrigerant C to circulate.

[0137] The exhaust flow path 123 may be inside the cooling plate 112 , and may be connected to each of the first inflow flow path 121 a and the second inflow flow path 121 b at the position of the refrigerant guide portion 16 to enable the refrigerant C to circulate.

[0138] In one or more embodiments, the exhaust flow path 123 may include a first exhaust flow path 123 a and a second exhaust flow path 123 b inside the cooling plate 112 and between the first inflow flow path 121 a and the second inflow flow path 121 b .

[0139] The first exhaust flow path 123a may extend in the first direction between the first inflow flow path 121a and the second inflow flow path 121b inside the cooling plate 112 and may be connected to the first inflow flow path 121a to circulate and exhaust the refrigerant.

[0140] The second exhaust flow path 123b may extend in the first direction between the first inflow flow path 121a and the second inflow flow path 121b inside the cooling plate 112 and may be connected to the second inflow flow path 121b to circulate and exhaust the refrigerant.

[0141] In one or more embodiments, the refrigerant C can be introduced through the first inflow flow path 121a and the second inflow flow path 121b so that the flow direction of the refrigerant changes (e.g., reverses) at the position of the refrigerant guide portion 16 to circulate and discharge the refrigerant through the first exhaust flow path 123a and the second exhaust flow path 123b.

[0142] Fig.16 For along Fig.13 , and schematically shows a state where the composite frame and the base plate are connected via a flow path connecting portion, and Fig.17 For along Fig.13 A cross-sectional view taken along line DD.

[0143] refer to Fig.16 and Fig.17 , the flow path connection portion 114 may include a first connection portion 141 coupled to one end of the cooling plate 112 to connect the first inflow flow path 121a and the second inflow flow path 121b to the first side surface flow path 311 of the composite frame 31 of the frame portion 30. The flow path connection portion 114 may also include a second connection portion 143 coupled to one end of the cooling plate 112 to connect the first exhaust flow path 123a and the second exhaust flow path 123b to the first side surface flow path 311 of the frame portion 30.

[0144] The first connection portion 141 may be coupled to the first coupling groove 12 a at the first inflow flow path 121 a and the second inflow flow path 121 b inside the cooling plate 112 such that the first connection portion 141 is connected to the upper flow path 311 a of the composite frame 31 .

[0145] The first connecting portion 141 may include a first bent plate 141a and a first pipeline 141b, one side of the first bent plate 141a covers the first connecting groove 12a and the other side is bent to extend in the thickness direction (Z-axis direction) of the cooling plate 112, and the first pipeline 141b protrudes upward from the first bent plate 141a and extends to the interior of the composite frame 31 to connect the first inflow flow path 121a and the second inflow flow path 121b with the upper flow path 311a.

[0146] One side of the first bent plate 141a may cover the first coupling groove 12a at each of the first inflow flow path 121a and the second inflow flow path 121b, and the other side of the first bent plate 141a may be bent downward to extend in the thickness direction (Z-axis direction) of the cooling plate 112 .

[0147] The first pipeline 141 b may protrude upward from an upper side of the first bent plate 141 a and extend into the frame portion 30 such that the first pipeline 141 b connects the first and second inflow flow paths 121 a and 121 b to the first side surface flow path 311 of the composite frame 31 .

[0148] The second connection portion 143 may be coupled to one end of the cooling plate 112 to connect the first and second exhaust flow paths 123 a and 123 b to the lower flow path 311 b of the composite frame 31 .

[0149] The second connecting portion 143 may include a second bent plate 143a and a second pipeline 143b, one side of the second bent plate 143a covers the first connecting groove 12a and the other side is bent downward to extend in the thickness direction (Z-axis direction) of the cooling plate 112, and the second pipeline 143b protrudes upward from the second bent plate 143a and extends to the interior of the composite frame 31 to connect the first exhaust flow path 123a and the second exhaust flow path 123b to the lower flow path 311b of the composite frame 31.

[0150] One side of the second bent plate 143a may cover the first coupling groove 12a formed at each of the first exhaust flow path 123a and the second exhaust flow path 123b, and the other side of the second bent plate 143a may be bent downward to extend in the thickness direction (Z-axis direction) of the cooling plate 112.

[0151] The second pipeline 143b may protrude upward from the upper side of the second bent plate 143a and extend into the frame portion 30. The second pipeline 143b may connect the first and second exhaust flow paths 123a and 123b to the lower flow path 311b of the first side surface flow path 311.

[0152] Fig.18 2 is a perspective view schematically showing a battery pack according to a third embodiment of the present disclosure. Fig.19 To schematically illustrate Fig.18 An exploded perspective view of the battery pack, Fig. 20 To schematically illustrate Fig.18 The plan view of the base plate, Fig.21 For along Fig.18 A cross-sectional view taken along line FF schematically showing a state in which the composite frame and the base plate are connected via a flow path connecting portion, and Fig. 22 For along Fig.18 A cross-sectional view taken along line EE of . Figure 1 to Figure 17 The same reference numerals as those in the figure represent the same or similar components having the same or similar functions. Detailed description of the same reference numerals will be omitted hereinafter.

[0153] like Figure 18 to Figure 22 As shown in , the base plate 210 of the battery pack 300 according to the third embodiment of the present disclosure may include a cooling plate 212, wherein a plurality of battery cells are in contact with a first surface of the cooling plate 212. A base flow path 220 is formed in the cooling plate 212. The flow path connecting portion 14 is coupled to one end of the cooling plate 212 and connects the first side surface flow path 311 of the frame portion 30 and the base flow path 220. The refrigerant guide portion 16 is coupled to the other end of the cooling plate 212, and is configured to guide the refrigerant introduced into the base flow path 220 to flow through the flow path connecting portion 14 in a discharge direction.

[0154] The substrate flow path 220 may include an inflow flow path 221 , a common inflow flow path 222 , and a discharge flow path 223 .

[0155] The inflow flow path 221 may be configured such that the first inflow flow path 221a, the second inflow flow path 221b, and the common inflow flow path 222 extend in a first direction (ie, a length direction in the y-axis direction) inside the cooling plate 212 and are spaced apart from each other in the x-axis direction.

[0156] The first inflow flow path 221 a may extend in the first direction inside one edge portion of the cooling plate 212 so that the refrigerant may be introduced, and the first inflow flow path 221 a may be connected to the exhaust flow path 223 .

[0157] The second inflow flow path 221 b may extend in the first direction inside an edge portion of the other side of the cooling plate 212 so that the refrigerant may be introduced, and the second inflow flow path 221 b may be connected to the exhaust flow path 223 .

[0158] The common inflow flow path 222 may include two flow paths formed along the first direction (y-axis direction) inside the cooling plate 212 between the first inflow flow path 221 a and the second inflow flow path 221 b and moving the refrigerant. The common inflow flow path 222 may be connected to the exhaust flow path 223 .

[0159] The common inflow flow path 222 may include a first common inflow flow path 222a, which extends along the first direction inside the cooling plate 212 between the first inflow flow path 221a and the second inflow flow path 221b and is connected to a first common exhaust flow path 223a to be described later. The common inflow flow path 222 may also include a second common inflow flow path 222b, which extends along the first direction inside the cooling plate 212 parallel to or substantially parallel to the first common inflow flow path 222a and is connected to a second common exhaust flow path 223b to be described later.

[0160] In one or more embodiments, a portion of the refrigerant introduced through the common inflow flow path 222 may flow through the first common inflow flow path 222 a to circulate to the first common exhaust flow path 223 a .

[0161] A portion of the remaining refrigerant introduced through the common inflow flow path 222 may flow through the second common inflow flow path 222 b to circulate through the second common exhaust flow path 223 b .

[0162] The exhaust flow path 223 may be connected to the inflow flow paths between the first inflow flow path 221 a , the second inflow flow path 221 b , and the common inflow flow path 222 to circulate the refrigerant.

[0163] The exhaust flow path 223 may include a first common exhaust flow path 223a inside the cooling plate 212 between the first inflow flow path 221a and the common inflow flow path 222, and a second common exhaust flow path 223b inside the cooling plate 212 between the common inflow flow path 222 and the second inflow flow path 221b.

[0164] The first common exhaust flow path 223a may extend along the first direction inside the cooling plate 212 and may be connected to each of the first inflow flow path 221a and the common inflow flow path 222 so that the refrigerant moving through each of the first inflow flow path 221a and the common inflow flow path 222 circulates and is exhausted.

[0165] In one or more embodiments, the first common exhaust flow path 223a may include a first output flow path 223a1 and a second output flow path 223a2, wherein the first output flow path 223a1 is inside the cooling plate 212 between the first inflow flow path 221a and the common inflow flow path 222 and is connected to the first inflow flow path 221a to exhaust the refrigerant, and the second output flow path 223a2 is inside the cooling plate 212 on a side surface of the first output flow path 223a1 and is connected to the first common inflow flow path 222a to exhaust the refrigerant.

[0166] In one or more embodiments, the refrigerant introduced through the first inflow flow path 221a may be discharged through the first output flow path 223a1. The refrigerant introduced through the first common inflow flow path 222a may be discharged through the second output flow path 223a2.

[0167] The second common exhaust flow path 223b may extend inside the cooling plate 212 between the common inflow flow path 222 and the second inflow flow path 221b along the first direction (y-axis direction), and may be connected to each of the common inflow flow path 222 and the second inflow flow path 221b, so that the refrigerant flowing through each of the common inflow flow path 222 and the second inflow flow path 221b circulates and is discharged.

[0168] The second common exhaust flow path 223b may include a third output flow path 223b1 and a fourth output flow path 223b2, wherein the third output flow path 223b1 is inside the cooling plate 212 between the second inflow flow path 221b and the common inflow flow path 222 and is connected to the second common inflow flow path 222b to exhaust the refrigerant, and the fourth output flow path 223b2 is inside the cooling plate 212 on the side surface of the third output flow path 223b1 and is connected to the second inflow flow path 221b to exhaust the refrigerant.

[0169] In one or more embodiments, the refrigerant introduced through the second common inflow flow path 222b may be discharged through the third output flow path 223b1. The refrigerant introduced through the second inflow flow path 221b may be discharged through the fourth output flow path 223b2.

[0170] In one or more embodiments, the flow path connecting portion 14 may include a first connecting portion 141 and a second connecting portion 143, the first connecting portion 141 being connected to one end of the cooling plate 212 to connect the first inlet flow path 221a, the second inlet flow path 221b and the common inlet flow path 222 to the side surface flow path of the frame portion 30, and the second connecting portion 143 being connected to one end of the cooling plate 212 to connect the first common exhaust flow path 223a and the second common exhaust flow path 223b to the side surface flow path of the frame portion 30.

[0171] The first coupling groove 12a for coupling the first and second connection parts 141 and 143 may be at one side of each of the first and second inflow flow paths 221a and 221b, the common inflow flow path 222, and the first and second common exhaust flow paths 223a and 223b.

[0172] The first connection portion 141 may include a first bent plate 141a, one side of which covers the first coupling groove 12a at the first inflow flow path 221a, the second inflow flow path 221b, and the common inflow flow path 222, and the other side of which is bent downward in the thickness direction (Z-axis direction) of the cooling plate 112. The first pipeline 141b protrudes upward from the first bent plate 141a and extends to the inside of the composite frame 31, and connects the first inflow flow path 221a, the second inflow flow path 221b, and the common inflow flow path 222 to the first side surface flow path 311 of the composite frame 31.

[0173] The first bending plate 141 a may be coupled to each of the first and second inflow flow paths 221 a and 221 b and the common inflow flow path 222 , and the first pipeline 141 b may be coupled to an upper portion of the first bending plate 141 a .

[0174] The first pipeline 141 b is configured to enable circulation supply of refrigerant by connecting the first and second inflow flow paths 221 a and 221 b and the common inflow flow path 222 to the first side surface flow path 311 of the composite frame 31 .

[0175] The second connection portion 143 may include a second bent plate 143a having one side covering the first coupling groove 12a and the other side bent downward to extend in the thickness direction (Z-axis direction) of the cooling plate. The second pipeline 143b protrudes upward from the second bent plate 143a and extends to the inside of the composite frame 31 to connect the first common exhaust flow path 223a and the second common exhaust flow path 223b to the first side surface flow path 311.

[0176] The second bending plate 143a may be coupled to the first coupling groove 12a at each of the first common exhaust flow path 223a and the second common exhaust flow path 223b, and the second pipeline 143b may extend upward from an upper portion of the second bending plate 143a.

[0177] The second coupling groove 12 b for coupling the refrigerant guide portion 16 may be at the other side of each of the first and second inflow flow paths 221 a and 221 b , the common inflow flow path 222 , and the first and second common exhaust flow paths 223 a and 223 b .

[0178] As described above, in a configuration in which a plurality of battery cells 11 including a battery cell are accommodated in a frame portion, the battery pack 300 of the third embodiment of the present disclosure can effectively cool three surfaces of the bottom and side surfaces of the battery cell 11. Cooling the battery cell 11 is configured to extend the service life of the battery pack and improve the durability of the battery pack.

[0179] While the present disclosure has been described in connection with what are presently considered to be practical embodiments, it is to be understood that the disclosure is not limited to the disclosed embodiments, but on the contrary is intended to cover various modifications and equivalent arrangements included within the purview of the appended claims.

[0180] <Description of Reference Numerals>

[0181] 10, 110: Base plate 1: Battery cell

[0182] 12, 112: cooling plate 12a: first connection groove

[0183] 12b: Second connection groove 14, 114: Flow path connection portion

[0184] 141: first connecting portion 141a: first bent plate

[0185] 141b: first pipeline 141c: first sealing member

[0186] 143: second connecting portion 143a: second bent plate

[0187] 143b: Second pipeline 143c: Second sealing member

[0188] 16: Refrigerant guide portion 20, 120, 220: Base flow path

[0189] 21, 121, 221: Inflow flow path 121a: First inflow flow path

[0190] 121b: Second inflow flow path 222: Common inflow flow path

[0191] 222a: First common inflow flow path

[0192] 222b: Second common inflow flow path

[0193] 23, 123, 223: Exhaust flow path 223a: First common exhaust flow path

[0194] 223a1: first output flow path 223a2: second output flow path

[0195] 223b: Second common exhaust flow path 223b1: Third output flow path

[0196] 223b2: fourth output flow path 123a: first exhaust flow path

[0197] 123b: Second exhaust flow path 30: Frame portion

[0198] 31: Composite frame 33: End frame

[0199] 35: first side frame 37: second side frame

[0200] 311: first side surface flow path 311a: upper flow path

[0201] 311b: Lower flow path 312: Gas inflow portion

[0202] 314: Gas discharge section 315: Discharge unit

[0203] 315a: discharge body 315b: discharge protrusion

[0204] 316: Guide part 40: Side surface cooling frame

[0205] 41: Second side surface flow path 41a: Side surface upper flow path

[0206] 41b: Flow path under the side surface 43: First plug

[0207] 45: Second plug 47: Side surface refrigerant guide portion

Claims

1. A battery pack comprising: Multiple battery cells; a base plate including a first surface and a base flow path, wherein the plurality of battery cells are in contact with the first surface, and the base flow path is configured to circulate a refrigerant to cool the plurality of battery cells; as well as A frame portion includes a plurality of frames connected to each other on the upper side of the first surface of the base plate, the frame portion having an accommodation space for accommodating the plurality of battery cells and a side surface flow path connected to the base flow path, and the refrigerant is configured to flow through the side surface flow path.

2. The battery pack according to claim 1, wherein the base plate comprises: a cooling plate comprising said first surface and said substrate flow path; a flow path connecting portion coupled to one end of the cooling plate and connecting the side surface flow path of the frame portion and the base flow path; as well as A refrigerant guide portion is coupled to the other end of the cooling plate, the refrigerant guide portion being configured to guide the refrigerant introduced into the base flow path to flow through the flow path connection portion in a discharge direction.

3. The battery pack according to claim 2, wherein: The base flow path includes an inflow flow path, the refrigerant introduced through the flow path connection portion moves through the inflow flow path in a first direction inside the cooling plate, and an exhaust flow path, in which the flow direction of the refrigerant introduced through the inflow flow path is reversed at the position of the refrigerant guide portion to move in a second direction opposite to the first direction, The inflow flow path extends in the first direction inside the cooling plate to introduce the refrigerant, and is connected to the exhaust flow path at the position of the refrigerant guide portion, and The exhaust flow path is connected to the inflow flow path inside the cooling plate. 4 . The battery pack according to claim 3 , further comprising a first coupling groove coupled to the flow path connecting portion at the one end of the cooling plate, the first coupling groove opening a portion of each of the inflow flow path and the exhaust flow path.

5. The battery pack according to claim 4, wherein the flow path connecting portion comprises: a first connection portion coupled to the one end of the cooling plate to connect the inflow flow path to the side surface flow path of the frame portion; as well as A second connection portion is coupled to the one end of the cooling plate to connect the exhaust flow path to the side surface flow path of the frame portion.

6. The battery pack according to claim 5, wherein: The first connection portion includes: a first bent plate including one side covering the first coupling groove and the other side extending in the thickness direction of the cooling plate; and a first pipeline protruding from an upper side of the first bent plate, extending into the frame portion, and connecting the inflow flow path and the side surface flow path, and The second connecting portion includes: a second bent plate, the second bent plate including one side covering the first connecting groove and the other side extending in the thickness direction of the cooling plate; and a second pipeline, the second pipeline protrudes from the upper side of the second bent plate, extends into the frame portion, and connects the exhaust flow path and the side surface flow path. 7 . The battery pack according to claim 4 , further comprising a second coupling groove at the other end of the cooling plate, the second coupling groove being coupled to the refrigerant guide portion and opening another portion of each of the inflow flow path and the exhaust flow path. 8 . The battery pack according to claim 7 , wherein the refrigerant guide portion comprises a second bent plate including one side covering the second coupling groove and the other side extending in a thickness direction of the cooling plate.

9. The battery pack according to claim 6, wherein the frame portion comprises: a composite frame coupled to one edge of the base plate, wherein a first side surface flow path is inside the composite frame, and the first side surface flow path is connected to the first connection portion and the second connection portion to supply the refrigerant; an end frame coupled to the other edge of the base plate; a first side frame having both ends connected to one end of each of the composite frame and the end frame; as well as A second side frame, both ends of which are respectively connected to the other end of each of the composite frame and the end frame.

10. The battery pack according to claim 9, further comprising a gas exhaust portion in the composite frame configured to exhaust a gas generated from one of the plurality of battery cells, wherein the gas exhaust portion comprises: a gas inflow portion on a first side surface of the composite frame, and through which the gas generated from the one of the plurality of battery cells is introduced; and a gas discharge portion through which the gas introduced into the gas inflow portion is discharged to the outside at the composite frame. 11 . The battery pack according to claim 10 , wherein an interior of the composite frame is divided into a first region and a second region, wherein the first side surface flow path is at the first region, and wherein the gas discharge portion is at the second region.

12. The battery pack according to claim 11, wherein the gas exhaust portion comprises: a discharge unit protruding from a second side surface of the composite frame facing the first side surface, the discharge unit being configured to discharge the gas; as well as A guide portion protrudes from an inner wall surface of the second region inside the composite frame, the guide portion being configured to guide the gas toward the discharge unit. 13 . The battery pack according to claim 9 , wherein the frame portion further comprises a side surface cooling frame in contact with side surfaces of the plurality of battery cells.

14. The battery pack according to claim 13, wherein one side of the side surface cooling frame is connected to the first side surface flow path of the composite frame, wherein the other side of the side surface cooling frame extends in a direction toward the end frame, and wherein the second side surface flow path through which the refrigerant flows is inside the side surface cooling frame.

15. The battery pack according to claim 14, wherein the first side surface flow path includes an upper flow path connected to the first pipeline and a lower flow path connected to the second pipeline, and wherein the second side surface flow path includes: an upper side surface flow path extending in a length direction inside the side surface cooling frame and connected to the upper flow path of the composite frame; and a side surface lower flow path extending in the length direction inside the side surface cooling frame and below the side surface upper flow path to be connected to the lower flow path of the composite frame.

16. The battery pack according to claim 15 further comprises a side surface refrigerant guide portion at the other side of the side surface cooling frame, wherein the side surface refrigerant guide portion is configured to change the flow direction of the refrigerant flowing through the flow path on the side surface to the direction of the flow path under the side surface.

17. The battery pack of claim 3, wherein the inflow flow path comprises: a first inflow flow path extending along the first direction at one side of the cooling plate to introduce the refrigerant and connected to the exhaust flow path; and a second inflow flow path extending along the first direction at the other side of the cooling plate to introduce the refrigerant and connected to the exhaust flow path, and wherein the exhaust flow path comprises: a first exhaust flow path extending along the first direction between the first inflow flow path and the second inflow flow path inside the cooling plate and connected to the first inflow flow path to exhaust the refrigerant; and a second exhaust flow path extending in the first direction between the first inflow flow path and the second inflow flow path inside the cooling plate and connected to the second inflow flow path to exhaust the refrigerant.

18. The battery pack according to claim 17, wherein the flow path connecting portion comprises: a first connection portion coupled to the one end of the cooling plate to connect the first inflow flow path and the second inflow flow path to the side surface flow path of the frame portion; as well as A second connection portion is coupled to the one end of the cooling plate to connect the first exhaust flow path and the second exhaust flow path to the side surface flow path of the frame portion.

19. The battery pack of claim 3, wherein the inflow flow path comprises: a first inflow flow path extending inside one edge portion of the cooling plate along the first direction so that the refrigerant is introduced and connected to the exhaust flow path; a second inflow flow path extending along the first direction inside the edge portion on the other side of the cooling plate so that the refrigerant is introduced and connected to the exhaust flow path; and a common inflow flow path including two flow paths extending along the first direction inside the cooling plate between the first inflow flow path and the second inflow flow path and connected to the exhaust flow path, and wherein the exhaust flow path comprises: a first common exhaust flow path extending along the first direction inside the cooling plate between the first inflow flow path and the common inflow flow path and connected to each of the first inflow flow path and the common inflow flow path to exhaust the refrigerant; and a second common exhaust flow path extending in the first direction inside the cooling plate between the second inflow flow path and the common inflow flow path and connected to each of the second inflow flow path and the common inflow flow path to exhaust the refrigerant.

20. The battery pack according to claim 19, wherein the flow path connecting portion comprises: a first connection portion coupled to the one end of the cooling plate to connect the first inflow flow path, the second inflow flow path, and the common inflow flow path to the side surface flow path of the frame portion; as well as A second connection portion is coupled to the one end of the cooling plate to connect the first common exhaust flow path and the second common exhaust flow path to the side surface flow path of the frame portion.

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