Rechargeable battery pack

Abstract

Disclosed is a rechargeable battery pack that maximizes pack energy density by stacking battery cells. The rechargeable battery pack includes: a center frame having a first bottom and a first side wall and supporting a cell stack; a first side frame and a second side frame having a second bottom and a second side wall, and coupled to the central frame in a second direction crossing the first direction and supporting a cell narrow side of the cell stack; and a first end frame and a second end frame coupled to both ends of the center frame and both ends of the first side frame and the second side frame in the first direction to support a cell wide side of the cell stack.

Description

Technical Field

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

[0002] Unlike primary batteries, rechargeable batteries are batteries that are repeatedly charged and discharged. Small-capacity rechargeable batteries are used in small portable electronic devices such as mobile phones, laptop computers, and portable video cameras. High-capacity and high-density secondary batteries are used as power sources for driving motors in hybrid vehicles and electric vehicles or for energy storage.

[0003] A rechargeable battery module may include a plurality of battery cells connected in series and / or in parallel to drive, for example, a motor of a hybrid vehicle that requires a relatively high energy density. For example, a rechargeable battery module may be formed by stacking a plurality of battery cells in a frame, and the number of battery cells may depend on the desired power of the rechargeable battery module (e.g., for an electric vehicle).

[0004] Such rechargeable battery modules are connected in series and / or in parallel within a housing manufactured using various methods to form a rechargeable battery pack. Accordingly, various types of rechargeable battery modules are being manufactured to accommodate the capacity of the rechargeable battery pack.

[0005] However, in terms of energy capacity, there are limitations to groups having rechargeable battery modules. Therefore, in order to maximize the energy of a rechargeable battery pack, it is desirable to manufacture a rechargeable battery pack that directly assembles battery cells without using rechargeable battery modules.

[0006] The above information disclosed in this background art section is for enhancing the understanding of the background of the present disclosure, and thus, it may contain information that does not constitute the prior art. Summary of the Utility Model

[0007] Embodiments of the present disclosure relate to a rechargeable battery pack that maximizes or at least increases the energy density of a group by stacking battery cells.

[0008] A rechargeable battery pack according to an embodiment of the present disclosure includes: a central frame that supports a cell stack using a first bottom and a first sidewall; a first side frame and a second side frame that are coupled to the central frame in a second direction that intersects the first direction and have a second bottom and a second sidewall to support narrow sides of the cell stack; and a first end frame and a second end frame that are coupled to both ends of the central frame, the first side frame, and the second side frame in the first direction to support wide sides of the cell stack.

[0009] A rechargeable battery pack according to an embodiment of the present disclosure may further include an intersection center frame coupled to the middle of the center frame, the first side frame, and the second side frame in the first direction to support the wide sides of different cell stacks on both sides of the intersection center frame in the first direction.

[0010] The center frame, the first side frame, and the second side frame may correspond to various sizes of the cell stack according to the length in the first direction.

[0011] The cell stack may include insulating members provided at both ends of the at least one cell stack in the first direction and a pressing body provided outside the insulating members at at least one side of both ends of the at least one cell stack in the first direction.

[0012] The pressing body may include a first planar portion provided on the cell stack side, a second planar portion integrally formed with the first planar portion to form a gap, and a compression force generator supported on the second end frame by being screwed into the second planar portion and pressing the first planar portion against the cell stack.

[0013] The first planar portion is formed with an area equal to the wide side of the cell of the cell stack, the second planar portion is formed to have a region smaller than the area of the first planar portion, and the pressing body may further include an inclined surface portion connecting the first planar portion and the second planar portion in a direction inclined with respect to the first direction.

[0014] The pressing body may further include a rib connecting the first planar portion and the second planar portion in the first direction.

[0015] The first planar portion and the second planar portion may have recessed portions partially cut at a portion where the electrode terminals of the battery cell are provided.

[0016] The first planar portion may have a first exhaust hole, and the second planar portion may have second exhaust holes on both sides of the compression force generator and connected to the first exhaust hole.

[0017] The rechargeable battery pack may further include a group cover mounted on the first side frame, the second side frame, the first end frame, and the second end frame, wherein at least one of the first end frame and the second end frame has a group exhaust port connected to the second exhaust hole.

[0018] The first side frame and the second side frame may have an adhesive injection port provided at the top of the first side frame or the second side frame in the third direction, an inclined portion connected to the adhesive injection port and inclined inward in the second direction, and an induced gap portion connected to the inclined portion to form a gap for guiding the adhesive to the narrow side and the bottom of the battery cell. The induced gap portion may be filled with adhesive.

[0019] The rechargeable battery pack according to an embodiment of the present disclosure may further include an insulator provided between the second sidewall and the cell stack, and having a length (L) and a height (H) on the side surface and the bottom surface of the cell stack.

[0020] The first side frame and the second side frame may have the adhesive injection port, the inclined portion, and the induced gap portion on at least one side in the second direction.

[0021] The center frame may include an adhesive injection port provided at the top of the center frame in the third direction, a first inclined portion and a second inclined portion connected to the adhesive injection port and inclined inward and outward respectively in the second direction, and a first induced gap portion and a second induced gap portion respectively connected to the first inclined portion and the second inclined portion and respectively guiding the adhesive to the narrow sides of the battery cells provided on both sides of the center frame in the second direction. The first induced gap portion and the second induced gap portion may be filled with adhesive.

[0022] The rechargeable battery pack according to an embodiment of the present disclosure may further include a first insulator and a second insulator provided between the inner side of the first sidewall and the cell stack in the second direction and between the outer side of the first sidewall and the cell stack in the second direction, and having a length (L) and a height (H) on the side surface and the bottom surface of the cell stack.

[0023] The first side frame and the second side frame may have the adhesive injection port, the first inclined portion, the second inclined portion, the first induced gap portion, and the second induced gap portion on at least one side in the second direction.

[0024] The first side frame and the second side frame may include flanges formed to be long in the first direction at the outer edges of the first side frame and the second side frame in the second direction and mounted on a vehicle.

[0025] The first bottom and the second bottom may form a refrigerant passage, and the refrigerant passage may be connected to each other at both ends in the first direction and may be connected to a refrigerant inlet and a refrigerant outlet provided at one end of the rechargeable battery pack in the first direction and spaced apart from each other in the second direction.

[0026] The rechargeable battery pack according to the embodiment is equipped with a cell stack that stacks a plurality of battery cells in a first direction and has a center frame, a first side frame, a second side frame, a first end frame, and a second end frame, so that the group energy density can be maximized or at least increased.

[0027] According to the embodiment, the center frame, the first side frame, and the second side frame may correspond to various dimensions of the cell stack according to the length in the first direction. In addition, since the embodiment includes a pressurizing body in the cell stack, the cell stack may be extruded in the first direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a perspective view of a rechargeable battery pack according to an embodiment of the present disclosure.

[0029] Figure 2 is Figure 1 a perspective view of a group frame of an embodiment of the rechargeable battery pack illustrated in

[0030] Figure 3 is Figure 2 an exploded perspective view of the group frame of

[0031] Figure 4 is Figure 1 a perspective view of a cell stack of an embodiment of the rechargeable battery pack illustrated in

[0032] Figure 5 is along Figure 4 sectional view taken along line V-V of

[0033] Figure 6 is Figure 1 a partial top plan view of the rechargeable battery pack of

[0034] Figure 7 is along Figure 6 sectional view taken along line VII-VII of

[0035] Figure 8 is applied to Figure 6 a top plan view of the pressurizing body of

[0036] Figure 9 is Figure 8The first end view of the inner side of the pressing body in contact with the single cell stack.

[0037] Figure 10 is Figure 8 The second end view of the outer side of the pressing body in contact with the group frame.

[0038] Figure 11 is a sectional view taken along Figure 6 the line XI-XI.

[0039] Figure 12 is a partial sectional view of the group cover of the rechargeable battery pack assembled to Figure 1 the rechargeable battery pack.

[0040] Figure 13 is a sectional view taken along Figure 12 the line XIII-XIII. Detailed Description

[0041] Hereinafter, the present utility model will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the present utility model are shown. As will be appreciated by those skilled in the art, the described embodiments may be modified in various different ways, all of which do not depart from the spirit or scope of the present utility model. The drawings and description are to be regarded as illustrative rather than restrictive in nature. Like reference numerals designate the same elements throughout the specification.

[0042] Figure 1 is a perspective view of a rechargeable battery pack according to an embodiment of the present disclosure, Figure 2 is Figure 1 a perspective view of the group frame of the embodiment illustrated in Figure 3 and is Figure 2 an exploded perspective view of the group frame of

[0043] Referring to Figures 1 to 3 , a rechargeable battery pack according to an embodiment of the present disclosure includes a plurality of single cell stacks 100 and a group frame 200 on which the single cell stacks 100 are mounted. The group frame 200 includes a center frame 10, a first side frame 21, a second side frame 22, and a first end frame 31 and a second end frame 32.

[0044] In an embodiment where the group frame 200 is configured to extend longitudinally in a first direction (x-axis direction), the group frame 200 may further include a lateral or cross center frame 40. The lateral center frame 40 is coupled to the center frame 10 and the first side frame 21 and the second side frame 22 at an intermediate portion (e.g., middle portion or substantially middle portion) of the center frame 10 in the first direction (x-axis direction) to support different monomer stacks 100 on both sides of the lateral center frame 40 in the first direction (x-axis direction), e.g., the monomer wide sides of different monomer stacks 100.

[0045] The dimensions (lengths) of the center frame 10 and the first side frame 21 and the second side frame 22 may be, e.g., equal to the dimensions (lengths) of the monomer stack 100 in the first direction (x-axis direction). That is, the center frame 10 and the first side frame 21 and the second side frame 22 may be cut to appropriate lengths according to the length of the monomer stack 100 in the first direction (x-axis direction).

[0046] In the group frame 200, the center frame 10, the first side frame 21, and the second side frame 22 form an assembly space for the monomer stack 100.

[0047] The cross-sectional shapes and lengths of the center frame 10, the first side frame 21, and the second side frame 22 may be selected according to various energy requirements of an electric vehicle using the monomer stack 100.

[0048] The center frame 10 includes a first bottom 11 configured to support the monomer stack 100 and a first side wall 12. The first side wall 12 has a height extending upward in a third direction (z-axis direction) from the center (or substantially center) of the first bottom 11 in a second direction (y-axis direction) and extends longitudinally in the first direction (x-axis direction). Thus, the center frame 10 is formed with an open first bottom 11 on both sides in the second direction (y-axis direction) without side walls.

[0049] The first side frame 21 and the second side frame 22 are each coupled to the center frame 10 in a second direction (y-axis direction) intersecting the first direction (x-axis direction) and each have a second bottom 211 and second side walls 212, 213 to support the monomer narrow sides (xz plane) of the monomer stack 100.

[0050] The first end frame 31 and the second end frame 32 are coupled to both ends (i.e., opposite ends) of the center frame 10 and both ends (i.e., opposite ends) of the first side frame 21 and the second side frame 22 in the first direction (x-axis direction) to support the monomer wide sides (yz plane) of the monomer stack 100.

[0051] Figure 4is a perspective view of the cell stack 100 in which the battery cells 101 are stacked. Refer to Figure 1 and Figure 4 , the cell stack 100 is formed by stacking a plurality of battery cells 101 in a first direction (x-axis direction).

[0052] Before being mounted on the group frame 200, the cell stack 100 is in an uncompressed state. Each of the battery cells 101 is a square rechargeable battery having a cell wide side (yz plane) and a cell narrow side (xz plane), and includes electrode terminals 102, 103 at the top.

[0053] In the battery cell 101, the cell wide side (yz plane) faces both sides in the first direction (x-axis direction). The cell narrow side (xz plane) faces both sides in a second direction (y-axis direction) orthogonal to the first direction (x-axis direction). The electrode terminals 102, 103 face upward in a third direction (z-axis direction) orthogonal to the first direction (x-axis direction) and the second direction (y-axis direction).

[0054] Figure 5 is a sectional view taken along the Figure 4 line V-V, Figure 6 is Figure 1 a partial top plan view of the rechargeable battery pack, and Figure 7 is a sectional view taken along the Figure 6 line VII-VII.

[0055] Refer to Figures 4 to 7 , the cell stack 100 includes insulating members 41, 42 and a pressurizing body 50. The insulating members 41, 42 are provided at both ends (i.e., opposite ends) of the cell stack 100 in the first direction, and are provided on the cell wide side (yz plane) of the outermost battery cell 101 in the first direction (x-axis direction). The pressurizing body 50 is located outside the insulating members 41, 42 at at least one of both ends of the cell stack 100 in the first direction, and presses (compresses) the battery cells 101 of the cell stack 100 together in the first direction.

[0056] Figure 8 is a top plan view of the pressurizing body 50 applied to Figure 6 , Figure 9 is Figure 8 a first end view of the inner side of the pressurizing body 50 in contact with the cell stack, and Figure 10 is Figure 8 a second end view of the outer side of the pressurizing body 50 in contact with the group frame 200.

[0057] Refer to Figures 6 to 10, the pressing body 50 includes a first planar portion 51 on one side or at least one end of the single stack 100, a second planar portion 52 spaced apart from the first planar portion 51 by a certain gap, and a compression force generator 53.

[0058] The compression force generator 53 is supported on the second end frame 32 by screwing the compression force generator 53 into the second planar portion 52, so that the first planar portion 51 presses or compresses the single stack 100. In one or more embodiments, the compression force generator 53 is a bolt.

[0059] The bolt head of the compression force generator 53 is located between the first planar portion 51 and the second planar portion 52 and can be rotationally adjusted. The end of the compression force generator 53 screwed into the second planar portion 52 is supported on the second end frame 32. As the protruding amount of the end of the compression force generator 53 towards the second planar portion 52 increases, the first planar portion 51 exerts a greater compression force on the single stack 100.

[0060] In one or more embodiments, the single stack assembly space is larger than the size of the single stack 100, and the single stack 100 is assembled in the single stack assembly space in an uncompressed state. The pressing body 50 configured to compress the single stack 100 is located on at least one side of the single stack 100 in the first direction.

[0061] In response to the rotation of the compression force generator 53, the pressing body 50 moves in a direction opposite to the direction of the compression force generator 53 and compresses the single stack 100. Compressing the single stack 100 adjusts the overall size of the single stack 100 in the first direction and enables the bus bar to be welded to the single stack 100.

[0062] After the single stack 100 is assembled into the group frame 200, the compression of the single stack 100 is performed by rotating the compression force generator 53 of the pressing body 50. After the assembly and compression of all the single stacks 100 are completed, the bus bar is laser welded to the electrode terminals 102, 103 of the battery cell 101.

[0063] In the event of a laser welding defect, the compression force generator 53 of the defective single stack 100 can be released, so that only the corresponding single stack 100 can be reworked (for example, laser welding can be performed again). Therefore, the rechargeable battery pack of the embodiment allows the single stack 100 to be reworked when a defect occurs during the process.

[0064] Rotating the compression force generator 53 causes the pressing body 50 to compress the battery cell 100. The compression force can be adjusted in various ways by adjusting the bolt outer diameter, material, and torque value of the compression force generator 53.

[0065] The relationship between the torque applied to the compression force generator 53 (e.g., a bolt) and the axial force of the compression force generator 53 can be calculated as shown in Equation 1.

[0066] Equation 1

[0067] F = T / Kd(1 - L / 100)

[0068] In Equation 1, F is the axial bolt force (compression force) (N), T is the wrench torque (Nm), K is a constant that varies according to the material and dimensions, d is the nominal bolt diameter (m), and L is the lubrication coefficient (%).

[0069] In an embodiment where T = 10 Nm, K = 0.2 (galvanized), and L = 0%, the compression force is approximately 2500 N. The compression force can be applied to the single stack 100 by applying various variable values of the compression force generator 53 (e.g., a bolt).

[0070] In one or more embodiments, the position of the compression force generator 53 relative to the pressurizing body 50 can be specified. In the pressurizing body 50, the first planar portion 51 is formed with an area corresponding (e.g., equal) to the single wide side (yz plane) of the single stack 100. In one or more embodiments, the second planar portion 52 has an area smaller than the area of the first planar portion 51.

[0071] The pressurizing body 50 further includes an inclined surface portion 54 that connects the first planar portion 51 and the second planar portion 52 in a direction inclined with respect to the first direction (x-axis direction). The pressurizing body 50 further includes a rib 55 that connects the first planar portion 51 and the second planar portion 52 in the first direction (x-axis direction). When the compression force is transmitted from the second planar portion 52 to the first planar portion 51, the inclined surface portion 54 and the rib 55 strengthen the mechanical strength of the pressurizing body 50 and prevent (or at least mitigate) deformation.

[0072] In addition, the first planar portion 51 and the second planar portion 52 respectively include recessed portions 511, 521 (e.g., notches) that are partially cut at portions where the electrode terminals 102, 103 of the battery cell 101 are located. The recessed portions 511, 521 prevent or at least reduce strong compression forces from being applied to the electrode terminals 102, 103, which are parts of the battery cell 101 that are structurally more complex and more vulnerable than the parts including the electrode assembly (not shown).

[0073] In addition, the first planar portion 51 has a first exhaust hole 512, and the second planar portion 52 has second exhaust holes 522 on both sides of the compression force generator 53 and connected to or in communication with the first exhaust hole 512.

[0074] The position of the compression force generator 53 is at the center (or approximate center) of the first planar portion 51 and the second planar portion 52 of the pressurizing body 50 to apply a uniform (or approximately uniform) compression force and does not protrude above the contact surface of the single cell stack 100.

[0075] The compressible distance CL of the compression force generator 53 is the distance between the lower end of the bolt head and the inner surface of the second planar portion 52. In one or more embodiments where the maximum compression requirement is 7 mm, it can be designed as follows.

[0076] It is possible to operate the wrench at the gap G2 (see Figure 12 ) provided between the first planar portion 51 and the second planar portion 52 at the upper central portion of the pressurizing body 50. To prevent (or at least mitigate) stress concentration on the second planar portion 52 and apply a uniform (or approximately uniform) compression force, the bolt diameter can be as large as possible within the range that does not cause assembly problems.

[0077] Once the assembly of the single cell stack 100 on the group frame 10 and the laser welding of the bus bars are completed, additional fixation of the single cell stack 100 can be performed. If the single cell stack 100 is not fully fixed, the battery cells 101 may move during cell expansion, vibration, or shock, which may lead to fire or explosion. In one or more embodiments, after assembling the single cell stack 100, side bonding is applied to both sides of the single cell stack 100 in the second direction (y-axis direction).

[0078] Figure 11 is a cross-sectional view taken along the Figure 6 line XI-XI. Referring to Figure 11 , the first side frame 21 and the second side frame 22 each include an adhesive injection port 221, an inclined portion 222, and a gap portion 223 on the second side walls 212, 213 for side bonding.

[0079] The adhesive injection port 221 is provided at the top of the first side frame 21 or the second side frame 22 in the third direction (z-axis direction) to enable injection of the adhesive. The inclined portion 222 is connected to the adhesive injection port 221 and is inclined inward in the second direction (y-axis direction). The inclined portion 222 is configured to allow the injected adhesive to flow downward.

[0080] The gap portion 223 is connected to the inclined portion 222 to form a gap that induces or guides the adhesive to flow downward from the narrow side (xz plane) of the cell of the battery cell 101 and the bottom (xy plane) of the cell of the battery cell 101. The gap portion 223 is filled with the adhesive 224 at the bottom (xy plane) of the cell and the narrow side (xz plane) of the cell adjacent to the bottom of the cell.

[0081] The filled adhesive 224 has a length L set at the bottom (xy plane) of the monomer and a height H set at the narrow side (xz plane) of the monomer. The adhesive 224 attaches the battery monomers 101 of the monomer stack 100 to the first side frame 21 and the second side frame 22.

[0082] An L-shaped insulator 214 having a length L and a height H can be applied to the side and bottom surfaces of the monomer stack 100 to form a space for the adhesive to flow between the monomer stack 100 and the second side walls 212, 213 and between the monomer stack 100 and the second bottom 211.

[0083] In this way, it is prevented that the monomer stack 100 is assembled eccentrically (i.e., distorted) between the second side walls 212, 213, and a minimum space equal to the thickness of the insulator 214 can be achieved. The adhesive flows downward and is absorbed into the insulator 214. In one or more embodiments, the adhesive has a viscosity capable of providing adhesion to the insulator 214.

[0084] Side bonding of the monomer stack 100 can be achieved. The inclination angle θ of the inclined portion 222 for applying the adhesive can be adjusted according to the viscosity of the adhesive. In one or more embodiments, for an adhesive with a relatively low viscosity, the inclination angle θ can be larger, and for an adhesive with a relatively high viscosity, the inclination angle θ can be smaller.

[0085] The gap GG for adhesive application between the battery monomer 101 and the second side walls 212, 213 can be adjusted according to the viscosity of the adhesive, and can be adjusted by adjusting the length L and height H of the insulator 214. That is, for an adhesive with a relatively high viscosity, the gap GG can be larger, and for an adhesive with a relatively low viscosity, the gap GG can be smaller.

[0086] In one or more embodiments where the adhesive has a viscosity of 5000 cps, the inclination angle θ can be in the range of approximately 40° to approximately 50°, and the gap GG can be in the range of approximately 1.0 mm to approximately 2.0 mm. In one or more embodiments, the inclination angle θ can be approximately 45°, and the gap GG can be approximately 1.5 mm.

[0087] In an embodiment where the adhesive has a viscosity of approximately 10000 cps, the inclination angle θ can be in the range of approximately 25° to approximately 35°, and the gap GG can be in the range of approximately 2.0 mm to approximately 3.0 mm. In one or more embodiments, the inclination angle θ can be approximately 30°, and the gap GG can be approximately 2.5 mm.

[0088] The first side frame 21 and the second side frame 22 may have an adhesive injection port 221, an inclined portion 222, and a gap portion 223 on at least one side in the second direction (y-axis direction), for example, on one of the second side walls 212, 213. In the illustrated embodiment, the adhesive injection port 221, the inclined portion 222, and the gap portion 223 may be provided on each of the second side walls 212, 213 in the second direction (y-axis direction) to provide stronger adhesion to the battery cell 101.

[0089] Reference Figure 11 , the center frame 10 may include an adhesive injection port 121, a first inclined portion 122, and a first gap portion 124 on the first side wall 12.

[0090] Since the first side wall 12 of the center frame 10 corresponds to the second side wall 213 of the first side frame 21 and the second side frame 22, a separate illustration of the first side wall 12 of the center frame 10 will be omitted, and it will be described by providing the adhesive injection port 121, the first inclined portion 122, and the second inclined portion 123, as well as the first gap portion 124 and the second gap portion 125, in the second side wall 213 of the Figure 11 first side frame 21 and the second side frame 22.

[0091] The adhesive injection port 121 is provided at the top of the first side wall 12 of the center frame 10 in the third direction (z-axis direction) to enable the injection of adhesive. The first inclined portion 122 and the second inclined portion 123 are connected to the adhesive injection port 121 and are formed to be inclined inward and outward, respectively, in the second direction.

[0092] The first gap portion 124 and the second gap portion 125 are respectively connected to the first inclined portion 122 and the second inclined portion 123, and induce or guide the adhesive to flow in the second direction to each of the narrow sides (xz plane) of the battery cells 101 on both sides of the first side wall 12 of the center frame 10. The first gap portion 124 and the second gap portion 125 are filled (or substantially filled) with adhesive 224 at the bottom (xy plane) of the battery cells 101 and the narrow sides (xz plane) adjacent to the bottom of the cells.

[0093] The first side frame 21 and the second side frame 22 include the adhesive injection port 121, the first inclined portion 122, and the second inclined portion 123, as well as the first gap portion 124 and the second gap portion 125, on the second side wall 213.

[0094] In the first side frame 21 and the second side frame 22, the first gap portion 124 and the second gap portion 125 are filled (or substantially filled) with an adhesive 224 at the cell bottom (xy plane) of the battery cell 101 and at the cell narrow side (xz plane) adjacent to the cell bottom.

[0095] The first insulator 245 and the second insulator 246 are respectively located between the inner side of the first side wall 12 and the cell stack 100 and between the outer side of the first side wall 12 and the cell stack 100 in the second direction. The first insulator 245 and the second insulator 246 each have an L-shaped cross section on the bottom surface and the side surface of the cell stack 100, and the first insulator 245 and the second insulator 246 have a length L and a height H to provide a space for the adhesive to flow.

[0096] Figure 12 is assembled to Figure 1 a partial cross-sectional view of the battery pack cover 300 of the rechargeable battery pack, Figure 13 is a cross-sectional view taken along the line XIII-XIII of Figure 12 . Referring to Figure 12 and Figure 13 , the rechargeable battery pack according to an embodiment of the present disclosure further includes a battery pack cover 300 mounted on the first side frame 21 and the second side frame 22 and on the first end frame 31 and the second end frame 32.

[0097] The battery pack cover 300 covers the bus bar that electrically connects the electrode terminals 102, 103 of the battery cell 101. In one or more embodiments, at least one of the first end frame 31 and the second end frame 32 includes a battery pack exhaust port 400 connected to the second exhaust hole 522.

[0098] The gap G1 between the bus bar and the battery pack cover 300 is connected to the gap G2 (in fluid communication with this gap G2) set between the first planar portion 51 and the second planar portion 52 of the pressurizing body 50. These gaps G1, G2 together with the recessed portions 511, 521 and the first exhaust hole 512 and the second exhaust hole 522 enable the gas generated from the battery cell 101 to be discharged during an event. The gas can be safely discharged to the outside of the rechargeable battery pack through the third exhaust hole 322 in the second end frame 32 through the battery pack exhaust port 400 provided in the second end frame 32.

[0099] Referring again to Figure 3 , the first side frame 21 and the second side frame 22 further respectively include flanges 216, 226 that extend longitudinally along the first direction (x-axis direction) and extend outward in the second direction (y-axis direction). The flanges 216, 226 are configured to be mounted on a vehicle.

[0100] In addition, a first bottom 11 of the central frame 10 and a second bottom 211 of each of the first side frame 21 and the second side frame 22 form a plurality of refrigerant channels 60 (see Figure 11 and Figure 12 ). The refrigerant circulating through the refrigerant channels 60 is configured to cool the battery cells 101. The refrigerant channels 60 are connected to each other at both ends in a first direction, and are connected to a refrigerant inlet 61 and a refrigerant outlet 62 that are provided at one end of the rechargeable battery pack in the first direction and are spaced apart from each other in a second direction.

[0101] Although the present disclosure has been described in connection with presently considered practical embodiments, it should be understood that the present disclosure is not limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the scope of the claims.

[0102] <Symbol Description>

[0103] 10: Central frame 11: First bottom

[0104] 12: First side wall 21: First side frame

[0105] 22: Second side frame 31: First end frame

[0106] 32: Second end frame 40: Cross central frame

[0107] 41, 42: Insulating members 50: Pressurizing body

[0108] 51: First planar portion 52: Second planar portion

[0109] 53: Compression force generator 54: Tilted surface portion

[0110] 55: Ribs 60: Refrigerant channels

[0111] 61: Refrigerant inlet 62: Refrigerant outlet

[0112] 100: Monomer stack 101: Battery cell

[0113] 102, 103: Electrode terminals

[0114] 121: Adhesive injection port 122: First inclined portion

[0115] 123: Second inclined portion 124: First gap portion

[0116] 125: Second gap portion 200: Group frame

[0117] 211: Second bottom 212, 213: Second side walls

[0118] 214: Insulator 216, 226: Flange

[0119] 221: Adhesive injection port 222: Inclined portion

[0120] 223: Gap portion 224: Adhesive

[0121] 245: First insulator 246: Second insulator

[0122] 300: Group cover 400: Group exhaust port

[0123] 511, 521: Recessed portion 512: First exhaust hole

[0124] 522, 322: Second exhaust hole, Third exhaust hole G1: Gap

[0125] G2: Gap GG: Gap

[0126] H: Height L: Length

[0127] θ: Inclination angle.

Claims

1. A rechargeable battery pack, characterized in that, Comprising: At least one monomer stack, including a plurality of battery monomers stacked in a first direction; A central frame, including a first bottom and a first sidewall for supporting the at least one monomer stack; A first side frame and a second side frame, each including a second bottom and a second sidewall, the first side frame and the second side frame being coupled to the central frame in a second direction intersecting the first direction and supporting the narrow sides of the monomers of the at least one monomer stack; And A first end frame and a second end frame, coupled to both ends of the central frame, both ends of the first side frame and both ends of the second side frame in the first direction to support the wide sides of the monomers of the at least one monomer stack.

2. The rechargeable battery pack according to claim 1, characterized in that, The at least one monomer stack includes a plurality of monomer stacks, and wherein the rechargeable battery pack further includes a transverse central frame coupled to an intermediate portion of the central frame, the first side frame and the second side frame in the first direction to support the wide sides of the monomers of the first monomer stack and the second monomer stack on both sides of the transverse central frame in the first direction.

3. The rechargeable battery pack according to claim 1, characterized in that, The at least one monomer stack includes a first monomer stack and a second monomer stack arranged in the first direction, and wherein the length of each of the central frame, the first side frame and the second side frame is equal to the combined length of the first monomer stack and the second monomer stack in the first direction.

4. The rechargeable battery pack according to claim 1, wherein, The rechargeable battery pack further includes: Insulating members at both ends of the at least one monomer stack in the first direction; and A pressing body on the outer side of the insulating member at at least one of the both ends of the at least one monomer stack in the first direction.

5. The rechargeable battery pack according to claim 4, wherein The pressing body includes: A first planar portion at at least one end of the at least one monomer stack; A second planar portion spaced apart from the first planar portion by a certain gap; and A compression force generator supported on the first end frame or the second end frame, Wherein the compression force generator is configured to be screwed into the second planar portion and compress the at least one monomer stack with the first planar portion.

6. The rechargeable battery pack according to claim 5, wherein, The first planar portion has an area equal to the wide side of the monomers of the at least one monomer stack, wherein the second planar portion has an area smaller than the area of the first planar portion, and wherein the pressing body further includes an inclined surface portion connecting the first planar portion and the second planar portion in a direction inclined with respect to the first direction.

7. The rechargeable battery pack according to claim 6, wherein The pressing body further includes a rib connecting the first planar portion and the second planar portion in the first direction.

8. The rechargeable battery pack according to claim 6, characterized in that, Each of the plurality of battery monomers includes an electrode terminal, and wherein the first planar portion and the second planar portion each include a notch at the portion where the electrode terminal is located.

9. The rechargeable battery pack according to claim 6, wherein, the first planar portion includes a first vent hole, and the second planar portion includes second vent holes on both sides of the compression force generator and communicating with the first vent hole.

10. The rechargeable battery pack according to claim 9, characterized in that, The rechargeable battery pack further includes: a group cover on the first side frame, the second side frame, the first end frame, and the second end frame, wherein at least one of the first end frame and the second end frame includes a group vent connected to the second vent hole.

11. The rechargeable battery pack according to claim 1, characterized in that, Each of the first side frame and the second side frame includes: an adhesive injection port at the top of the first side frame or the second side frame in a third direction intersecting the first direction and the second direction; an inclined portion connected to the adhesive injection port and inclined inward in the second direction; and a gap portion connected to the inclined portion to form a gap configured to guide the adhesive to the narrow side and the bottom of the monomer of the at least one monomer stack, and wherein the rechargeable battery pack further includes an adhesive in the gap portion.

12. The rechargeable battery pack according to claim 11, characterized in that, The rechargeable battery pack further includes insulators having a length (L) and a height (H) on the side surface and the bottom surface of the at least one monomer stack.

13. The rechargeable battery pack according to claim 11, wherein, each of the first side frame and the second side frame includes the adhesive injection port, the inclined portion, and the gap portion on at least one side in the second direction.

14. The rechargeable battery pack according to claim 1, wherein, The rechargeable battery pack further includes an adhesive, and wherein the center frame includes: an adhesive injection port at the top of the center frame in a third direction intersecting the first direction and the second direction; a first inclined portion connected to the adhesive injection port and inclined inward in the second direction; a second inclined portion connected to the adhesive injection port and inclined outward in the second direction; and a first gap portion connected to the first inclined portion and a second gap portion connected to the second inclined portion, the first gap portion and the second gap portion being configured to guide the adhesive to the narrow sides of the plurality of battery monomers on both sides of the center frame in the second direction, wherein the first gap portion and the second gap portion are filled with the adhesive.

15. The rechargeable battery pack according to claim 14, wherein, The rechargeable battery pack further includes a first insulator and a second insulator each having a length (L) and a height (H) on the side surface and the bottom surface of the at least one monomer stack.

16. The rechargeable battery pack according to claim 15, characterized in that, Each of the first side frame and the second side frame includes the adhesive injection port, the first inclined portion, and the second inclined portion, and the first gap portion and the second gap portion on at least one side in the second direction.

17. The rechargeable battery pack according to claim 1, characterized in that, Each of the first side frame and the second side frame includes a flange extending longitudinally along the first direction and extending outward in the second direction, and wherein the flange is configured to be mounted on a vehicle.

18. The rechargeable battery pack according to claim 1, wherein the first bottom and the second bottom each include a plurality of refrigerant channels, the plurality of refrigerant channels are connected to each other in the first direction, and the plurality of refrigerant channels are connected to a refrigerant inlet and a refrigerant outlet that are at one end of the rechargeable battery pack in the first direction and are spaced apart from each other in the second direction.

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