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 camcorders. 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 a motor of, for example, a hybrid vehicle requiring 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 charge 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 case manufactured using various methods to form a rechargeable battery pack. Therefore, various types of rechargeable battery modules are being manufactured to accommodate the capacity of the rechargeable battery pack.

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

[0006] The above information disclosed in this Background section is for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art. Summary of the invention

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

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

[0009] The rechargeable battery pack according to an embodiment of the present disclosure may further include a cross 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 cell wide sides of different cell stacks on both sides of the cross 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 unit stack according to the length in the first direction.

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

[0012] The pressurizing body may include a first planar portion provided on the side of the single-body stack, 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 causing the first planar portion to press the single-body stack.

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

[0014] The pressurizing 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 partially cut concave portions at portions where electrode terminals of the battery cells are disposed.

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

[0017] The rechargeable battery pack may further include a pack 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 pack 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 inwardly in the second direction, and an inducing gap portion connected to the inclined portion to form a gap for guiding the adhesive to the cell narrow side and the cell bottom of the battery cell. The inducing gap portion may be filled with an adhesive.

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

[0020] The first and second side frames may have the adhesive injection port, the inclined portion, and the gap inducing 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, first and second inclined portions connected to the adhesive injection port and inclined inwardly and outwardly, respectively, in the second direction, and first and second inducing gap portions connected to the first and second inclined portions and respectively inducing adhesive to the cell narrow sides of the battery cells provided at both sides of the center frame in the second direction. The first and second inducing gap portions 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, which are provided between the inner side of the first side wall and the cell stack in the second direction and between the outer side of the first side wall and the cell stack in the second direction, and have a length (L) and a height (H) on the side surface and the bottom surface of the cell stack.

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

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

[0025] The first bottom and the second bottom may form a refrigerant channel, which 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 of the embodiment is equipped with a cell stack that stacks a plurality of battery cells in a first direction and has a center frame, first and second side frames, and first and second end frames, so that the pack 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 sizes of the unit stack according to the length in the first direction. In addition, since the embodiment includes a pressurizing body in the unit stack, the unit stack may be pressed 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 yes Figure 1 A perspective view of a pack frame of an embodiment of a rechargeable battery pack illustrated in FIG.

[0030] Figure 3 yes Figure 2 Exploded perspective view of a group frame.

[0031] Figure 4 yes Figure 1 0 is a perspective view of a cell stack of an embodiment of a rechargeable battery pack illustrated in FIG. 1 , in which battery cells are stacked.

[0032] Figure 5 It is along Figure 4 A cross-sectional view taken along line VV of FIG.

[0033] Figure 6 yes Figure 1 A partial top plan view of a rechargeable battery pack.

[0034] Figure 7 It is along Figure 6 A cross-sectional view taken along line VII-VII.

[0035] Figure 8 Is applied to Figure 6 A top plan view of a pressurized body.

[0036] Fig. 9 yes Figure 8A first end view of the inner side of the pressurizing body in contact with the cell stack.

[0037] Fig.10 yes Figure 8 A second end view of the outside of the pressurized body in contact with the group frame.

[0038] Fig.11 It is along Figure 6 A cross-sectional view taken along line XI-XI.

[0039] Fig.12 is assembled into Figure 1 A partial cross-sectional view of a pack cover of a rechargeable battery pack.

[0040] Fig.13 It is along Fig.12 A cross-sectional view taken along line XIII-XIII. DETAILED DESCRIPTION

[0041] Hereinafter, the present invention will be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways, all without departing from the spirit or scope of the present invention. The accompanying drawings and descriptions are to be regarded as illustrative rather than restrictive in nature. The same reference numerals indicate 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 yes Figure 1 A perspective view of a group frame of the embodiment illustrated in FIG. Figure 3 yes Figure 2 Exploded perspective view of a group frame.

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

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

[0045] The size (length) of the central frame 10 and the first side frame 21 and the second side frame 22 can be the same as, for example, equal to, the size (length) of the monomer stack 100 in the first direction (x-axis direction). That is, the central frame 10 and the first side frame 21 and the second side frame 22 can be cut into 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 unit 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 electric vehicles using the unit stack 100 .

[0048] The center frame 10 includes a first bottom 11 and a first side wall 12 configured to support the single stack 100. The first side wall 12 has a height extending upward in the third direction (z-axis direction) from the center (or substantially the center) of the first bottom 11 in the second direction (y-axis direction), and extends longitudinally in the first direction (x-axis direction). Therefore, the center frame 10 is formed with the first bottom 11 opened 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 connected to the central frame 10 in a second direction (y-axis direction) intersecting the first direction (x-axis direction), and each has a second bottom 211 and second side walls 212, 213 to support the narrow side (xz plane) of the single body stack 100.

[0050] The first end frame 31 and the second end frame 32 are connected 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 a first direction (x-axis direction) to support the single-body wide side (yz plane) of the single-body stack 100.

[0051] Figure 4 is a perspective view of a cell stack 100 in which battery cells 101 are stacked. 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] The cell stack 100 is in an uncompressed state before being mounted on the pack frame 200. 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 wide side of the cell (yz plane) faces both sides of the first direction (x-axis direction). The narrow side of the cell (xz plane) faces both sides of the second direction (y-axis direction) orthogonal to the first direction (x-axis direction). The electrode terminals 102 and 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 It is along Figure 4 A cross-sectional view taken along line VV of Figure 6 yes Figure 1 A partial top plan view of a rechargeable battery pack of Figure 7 It is along Figure 6 A cross-sectional view taken along 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 the two ends of the cell stack 100 in the first direction, and squeezes (compresses) the battery cells 101 of the cell stack 100 together in the first direction.

[0056] Figure 8 Is applied to Figure 6 A top plan view of the pressurized body 50, Fig. 9 yes Figure 8 A first end view of the inner side of the pressurized body 50 in contact with the cell stack, and Fig.10 yes Figure 8 FIG. 5 is 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 pressurizing body 50 includes a first planar portion 51 at one side or at least one end of the unit 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 unit 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 plane portion 51 and the second plane portion 52 and can be rotatably adjusted. The end of the compression force generator 53 screwed into the second plane portion 52 is supported on the second end frame 32. As the protrusion amount of the end of the compression force generator 53 toward the second plane portion 52 increases, the first plane portion 51 applies a greater compression force to the unit stack 100.

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

[0061] In response to the rotation of the compression force generator 53, the pressurizing body 50 moves in the direction opposite to the direction of the compression force generator 53 and compresses the cell stack 100. Compressing the cell stack 100 adjusts the overall size of the cell stack 100 in the first direction and enables welding of bus bars to the cell stack 100.

[0062] After the cell stack 100 is assembled to the assembly frame 200, compression of the cell stack 100 is performed by rotating the compression force generator 53 of the pressurizing body 50. After completing assembly and compression of all the cell stacks 100, the busbars are laser welded to the electrode terminals 102, 103 of the battery cells 101.

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

[0064] Rotating the compression force generator 53 causes the pressurizing body 50 to compress the battery cell 100. The compression force may 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 (eg, a bolt) and the axial force of the compression force generator 53 may 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 material and size, d is the nominal bolt diameter (m), and L is the lubrication factor (%).

[0069] At T = 10Nm, K = 0.2 (galvanized), d = 0.02m And in the embodiment where L=0%, the compressive force is approximately 2500 N. The compressive force can be applied to the cell stack 100 by applying various variable values ​​of the compressive force generator 53 (eg, bolts).

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

[0071] The pressurizing body 50 further includes an inclined surface portion 54 connecting the first plane portion 51 and the second plane portion 52 in a direction inclined relative to the first direction (x-axis direction). The pressurizing body 50 further includes a rib 55 connecting the first plane portion 51 and the second plane portion 52 in the first direction (x-axis direction). When the compressive force is transmitted from the second plane portion 52 to the first plane portion 51, the inclined surface portion 54 and the rib 55 reinforce the mechanical strength of the pressurizing body 50 and prevent (or at least alleviate) 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 compressive force from being applied to the electrode terminals 102, 103, which are portions of the battery cell 101 that are more structurally complex and more fragile than portions including an 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 a second exhaust hole 522 at both sides of the compression force generator 53 and connected to or communicating with the first exhaust hole 512 .

[0074] The compression force generator 53 is located at the center (or approximately the center) of the first and second planar portions 51 and 52 of the pressurizing body 50 to apply uniform (or approximately uniform) compression force and does not protrude above the contact surface of the 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 plane portion 52. In one or more embodiments where the maximum compression requirement is 7 mm, it can be designed as follows.

[0076] The wrench works in the gap G2 (see FIG. Fig.12 In order to prevent (or at least alleviate) stress concentration on the second planar portion 52 and apply uniform (or approximately uniform) compressive force, the bolt diameter may be as large as possible within a range that does not cause assembly problems.

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

[0078] Fig.11 It is along Figure 6 A cross-sectional view taken along line XI-XI of FIG. Fig.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) so as to be able to inject the adhesive. The inclined portion 222 is connected to the adhesive injection port 221 and is inclined inwardly 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 cell narrow side (xz plane) of the battery cell 101 and the cell bottom (xy plane) of the battery cell 101. The gap portion 223 is filled with adhesive 224 at the cell bottom (xy plane) and the cell narrow side (xz plane) adjacent to the cell bottom.

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

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

[0083] In this way, the unit stack 100 is prevented from being 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] The side bonding of the single 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, the inclination angle θ can be larger for a relatively low viscosity adhesive, and the inclination angle θ can be smaller for a relatively high viscosity adhesive.

[0085] The gap GG between the battery cell 101 and the second side walls 212, 213 for adhesive application 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 a relatively high viscosity adhesive, the gap GG can be larger, and for a relatively low viscosity adhesive, the gap GG can be smaller.

[0086] In one or more embodiments where the adhesive has a viscosity of 5000 cps, the tilt 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 tilt 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 10,000 cps, the tilt angle θ may be in the range of approximately 25° to approximately 35°, and the gap GG may be in the range of approximately 2.0 mm to approximately 3.0 mm. In one or more embodiments, the tilt angle θ may be approximately 30°, and the gap GG may be approximately 2.5 mm.

[0088] The first and second side frames 21 and 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 and 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 and 213 in the second direction (y-axis direction) to provide stronger adhesion with the battery cell 101.

[0089] refer to Fig.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 sidewall 12 .

[0090] Since the first side wall 12 of the center frame 10 corresponds to the second side wall 213 of the first and second side frames 21 and 22, a separate illustration of the first side wall 12 of the center frame 10 will be omitted and will be replaced by providing Fig.11 The adhesive injection port 121 , the first and second inclined portions 122 and 123 , and the first and second gap portions 124 and 125 in the second side walls 213 of the first and second side frames 21 and 22 are described.

[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 adhesive to be injected. 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 inwardly and outwardly, respectively, in the second direction.

[0092] The first gap portion 124 and the second gap portion 125 are connected to the first inclined portion 122 and the second inclined portion 123, respectively, and induce or guide the adhesive to flow in the second direction to each cell narrow side (xz plane) of the battery cell 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 the adhesive 224 at the cell bottom (xy plane) of the battery cell 101 and the cell narrow side (xz plane) adjacent to the cell bottom.

[0093] The first and second side frames 21 and 22 include an adhesive injection port 121 , first and second inclined portions 122 and 123 , and first and second gap portions 124 and 125 on the second sidewall 213 .

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

[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 in the second direction 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] Fig.12 is assembled into Figure 1 A partial cross-sectional view of a pack cover 300 of a rechargeable battery pack, Fig.13 It is along Fig.12 A cross-sectional view taken along line XIII-XIII of FIG. Fig.12 and Fig.13 The rechargeable battery pack according to an embodiment of the present disclosure further includes a pack cover 300 mounted on the first and second side frames 21 and 22 and the first and second end frames 31 and 32 .

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

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

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

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

[0101] 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 scope of the claims.

[0102] <Description of symbols>

[0103] 10: Center 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 center frame

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

[0108] 51: first plane portion 52: second plane portion

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

[0110] 55: Rib 60: Refrigerant channel

[0111] 61: Refrigerant inlet 62: Refrigerant outlet

[0112] 100: Single cell 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 part 200: Group frame

[0117] 211: second bottom 212, 213: second side wall 214: Insulator 216, 226: Flange

[0118] 221: Adhesive injection port 222: Inclined portion

[0119] 223: Gap part 224: Adhesive

[0120] 245: first insulator 246: second insulator

[0121] 300: Group cover 400: Group exhaust port

[0122] 511, 521: concave portion 512: first exhaust hole

[0123] 522, 322: second exhaust hole, third exhaust hole G1: gap

[0124] G2: Gap GG: Gap

[0125] H: height L: length

[0126] θ: Tilt angle

Claims

1. A rechargeable battery pack comprising: at least one cell stack including a plurality of battery cells stacked in a first direction; a center frame including a first bottom and a first side wall supporting the at least one monomer stack; a first side frame and a second side frame, each including a second bottom and a second side wall, the first side frame and the second side frame being coupled to the center frame in a second direction intersecting the first direction and supporting a single narrow side of the at least one single stack; as well as A first end frame and a second end frame are 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 single-unit wide side of the at least one single-unit stack.

2. A rechargeable battery pack according to claim 1, wherein the at least one single cell stack comprises a plurality of single cell stacks, and wherein the rechargeable battery pack further comprises a transverse center frame connected to a middle portion of the center frame, the first side frame and the second side frame in the first direction to support a single cell wide side of a first single cell stack and a single cell wide side of a second single cell stack among the plurality of single cell stacks on both sides of the transverse center frame in the first direction.

3. The rechargeable battery pack of claim 1 , wherein the at least one cell stack comprises a first cell stack and a second cell stack arranged in the first direction, and wherein a length of each of the center frame, the first side frame, and the second side frame is equal to a combined length of the first cell stack and the second cell stack in the first direction.

4. The rechargeable battery pack according to claim 1, further comprising: Insulating members at both ends of the at least one single stack in the first direction; as well as A pressurizing body is outside the insulating member at at least one of the two ends of the at least one cell stack in the first direction.

5. The rechargeable battery pack according to claim 4, wherein The pressurized body comprises: a first planar portion at said at least one end of said at least one monomer stack; a second plane portion, spaced apart from the first plane portion by a certain gap; as well as 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 cause the first planar portion to compress the at least one unit stack.

6. A rechargeable battery pack according to claim 5, wherein the first planar portion has an area equal to a cell wide side of the at least one cell stack, wherein the second planar portion has an area smaller than the area of ​​the first planar portion, and wherein the pressurizing body further includes an inclined surface portion connecting the first planar portion and the second planar portion in a direction inclined relative to the first direction.

7. The rechargeable battery pack according to claim 6, wherein The pressurizing 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 , wherein each of the plurality of battery cells includes an electrode terminal, and wherein the first planar portion and the second planar portion each include a notch at a 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, and The second planar portion includes second exhaust holes at both sides of the compression force generator and communicating with the first exhaust hole.

10. The rechargeable battery pack according to claim 9, further comprising: a cover assembly, on the first side frame, the second side frame, the first end frame and the second end frame, At least one of the first end frame and the second end frame includes a group exhaust port connected to the second exhaust hole.

11. The rechargeable battery pack according to claim 1, wherein: The first side frame and the second side frame each include: an adhesive injection port at a 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 inwardly in the second direction; and a gap portion connected to the inclined portion to form a gap configured to guide adhesive to the cell narrow sides and the cell bottom of the at least one cell stack, and wherein the rechargeable battery pack further comprises an adhesive in the gap portion. 12 . The rechargeable battery pack according to claim 11 , further comprising an insulator having a length (L) and a height (H) on side surfaces and a bottom surface of the at least one cell stack.

13. The rechargeable battery pack according to claim 11, wherein The first side frame and the second side frame each include 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 of claim 1, further comprising an adhesive, and wherein the central frame comprises: an adhesive injection port at a top of the central 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 inwardly in the second direction; a second inclined portion connected to the adhesive injection port and inclined outwardly in the second direction; as well as 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 cell narrow sides of the plurality of battery cells on both sides of the center frame in the second direction, The first gap portion and the second gap portion are filled with the adhesive. 15 . The rechargeable battery pack of claim 14 , further comprising first and second insulators each having a length (L) and a height (H) on a side surface and a bottom surface of the at least one cell stack.

16. The rechargeable battery pack of claim 15, wherein the first and second side frames each include the adhesive injection port, the first and second inclined portions, and the first and second gap portions on at least one side in the second direction.

17. The rechargeable battery pack of claim 1, wherein the first side frame and the second side frame each include a flange extending longitudinally along the first direction and extending outwardly 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 at one end of the rechargeable battery pack in the first direction and spaced apart from each other in the second direction.

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