Battery pack and battery pack device including the same

Abstract

A battery pack according to an embodiment of the present application includes a battery cell stack in which a plurality of battery cells are stacked, a module frame accommodating the battery cell stack, an end plate covering front and rear surfaces of the battery cell stack and coupled to the module frame, and a heat sink located below a bottom of the module frame, wherein the bottom of the module frame constitutes an upper plate of the heat sink, and a mounting and fixing structure of the end plate, the module frame, and the heat sink is formed to fasten them together.

Description

TECHNICAL FIELD

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2020-0043617, filed in the Korean Intellectual Property Office on April 9, 2020, the entire contents of which are incorporated herein by reference.

[0003] The present application relates to a battery pack and a device including the same, and more particularly, to a battery pack having improved cooling performance and a device including the same. BACKGROUND

[0004] In modern society, as portable devices such as mobile phones, notebook computers, camcorders, digital cameras, etc. are used on a daily basis, the technology in the field related to the above mobile devices has been actively developed. In addition, rechargeable secondary batteries are used as power sources for electric vehicles (EV), hybrid electric vehicles (HEV), plug-in hybrid electric vehicles (P-HEV), etc., in an attempt to solve air pollution, etc. caused by existing gasoline vehicles using fossil fuels, and thus, the demand for the development of secondary batteries is increasing.

[0005] Among the secondary batteries that are currently commercialized, there are nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries, etc., and among these, the lithium secondary battery has attracted much attention because it has advantages such as almost no memory effect compared to nickel-based secondary batteries and thus freely charges and discharges, and has a very low self-discharge rate and a high energy density.

[0006] Such a lithium secondary battery mainly uses a lithium-based oxide and a carbon-based material as a positive electrode active material and a negative electrode active material, respectively. The lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate coated with a positive electrode active material and a negative electrode active material, respectively, are disposed with a separator interposed therebetween, and a battery case that seals and accommodates the electrode assembly and an electrolyte.

[0007] In general, the lithium secondary battery can be classified into a can-type secondary battery in which the electrode assembly is built into a metal can and a pouch-type secondary battery in which the electrode assembly is built into a pouch of an aluminum laminate sheet, according to the shape of an external material.

[0008] In the case of a secondary battery for a small device, two to three battery cells are arranged, but in the case of a secondary battery for a medium to large device such as a car, a battery module in which a plurality of battery cells are electrically connected is used. In the battery module, generally, a plurality of secondary batteries are connected in series and in parallel to each other, thereby improving capacity and output. In addition, one or more battery modules can be installed together with various control and protection systems such as a battery management system (BMS: Battery Management System) and a cooling system to form a battery pack.

[0009] When a secondary battery is heated to be higher than an appropriate temperature, the performance of the secondary battery can be deteriorated, and in the most serious case, the secondary battery can explode or catch fire. In particular, in a battery module or a battery pack in which a plurality of secondary batteries, i.e., battery cells, are provided, heat emitted from the plurality of battery cells is accumulated in a narrow space, which can rapidly and sharply increase the temperature of the battery module. In other words, in the case of a battery module in which a plurality of battery cells are stacked and a battery pack in which the battery module is installed, a high output can be obtained, however, heat generated in the battery cells during charging and discharging is not easily removed. When heat dissipation of the battery cells is not properly performed, the deterioration of the battery cells is accelerated, the life thereof is shortened, and the possibility of explosion or fire increases.

[0010] In addition, when the battery module is included in a battery pack of a vehicle, the battery module can be frequently exposed to direct sunlight, and can also be placed in a high-temperature condition such as summer or a desert.

[0011] Therefore, when a battery module or a battery pack is configured, it is very important to secure stable and efficient cooling performance.

[0012] Figure 1 A perspective view of a conventional battery module is shown, and Figure 2 a cross-sectional view taken along the line A-A' of Figure 1 is shown. In particular, Figure 2 a heat transfer member and a heat sink located below the battery module are further shown.

[0013] Referring to Figure 1 and Figure 2 , in the conventional battery module 10, a plurality of battery cells 11 are stacked to form a battery cell stack 20, and the battery cell stack 20 is accommodated in a module frame 30.

[0014] As described above, since the battery module 10 includes a plurality of battery cells 11, a large amount of heat is generated during charging and discharging processes. As a cooling unit, the battery module 10 can include a thermally conductive resin layer 40 located between the battery cell stack 20 and the bottom 31 of the module frame 30. In addition, when the battery module 10 is installed in a battery pack frame to form a battery pack, a heat transfer member 50 and a heat sink 60 can be sequentially located below the battery module 10. The heat transfer member 50 can be a heat dissipation pad, and the heat sink 60 can have a refrigerant flow path formed therein.

[0015] The heat generated from the battery cells 11 is sequentially transferred through the thermally conductive resin layer 40, the bottom 31 of the module frame 30, the heat transfer member 50, and the heat sink 60 to the outside of the battery module 10.

[0016] Thus, in the case of the conventional battery module 10, as described above, the heat transfer path is complex, and it is difficult to efficiently transfer the heat generated from the battery cells 11. The module frame 30 itself can lower the thermal conduction characteristics, and a fine air layer such as an air gap can be formed between the module frame 30, the heat transfer member 50, and the heat sink 60, respectively, which can also be a factor in deteriorating the thermal conduction characteristics.

[0017] Since various demands have been always required for the battery module to have a small design and a large capacity, it is actually required to develop a battery module that can satisfy the various demands as described above while improving the cooling performance. SUMMARY

[0018] TECHNICAL PROBLEM

[0019] Embodiments of the present application are proposed to solve the above problems of the methods proposed in the related art, and thus an object of the present application is to provide a battery pack having improved cooling performance and a device including the same.

[0020] However, the objects of the present application are not limited to the above objects, and can be extended in various ways within the spirit and scope of the present application.

[0021] TECHNICAL SOLUTION

[0022] Embodiments of the present application provide a battery pack including a battery cell stack in which a plurality of battery cells are stacked, a module frame that accommodates the battery cell stack, an end plate that covers front and rear surfaces of the battery cell stack and is coupled to the module frame, and a heat sink located below a bottom of the module frame, wherein the bottom of the module frame constitutes an upper plate of the heat sink, and a mounting and fixing structure of the end plate, the module frame, and the heat sink is formed in a common fastening method.

[0023] The battery pack can further include a battery pack frame positioned below the heat spreader and coupled to the module frame, wherein the installation fixing structure can be coupled to the battery pack frame.

[0024] The end plate can include a first installation portion extending in a protruding direction of an electrode lead protruding from the battery cell, the module frame can include a second installation portion extending from the bottom along the first installation portion, the heat spreader can include a third installation portion extending along the first installation portion, first, second, and third through holes can be respectively formed in the first, second, and third installation portions, and positions of the first, second, and third through holes can be set to correspond to each other.

[0025] The battery pack can further include an installation bolt coupled to a fastening hole of the battery pack frame through the first, second, and third through holes.

[0026] The installation bolt can include a head at an upper end thereof, and the head can have a larger diameter than the first through hole.

[0027] The supply pipe and the bottom of the heat spreader can form a refrigerant flow path.

[0028] The bottom can be in direct contact with the refrigerant.

[0029] The supply pipe can be a U-shaped pipe, and the bottom can be positioned at an open upper side of the U-shaped pipe.

[0030] The supply pipe can include an inlet for introducing the refrigerant and an outlet for discharging the refrigerant.

[0031] The battery pack can further include a battery pack frame positioned below the heat spreader and coupled to the module frame, and a battery pack refrigerant supply pipe positioned between the battery pack frame and the heat spreader to supply the refrigerant to the supply pipe.

[0032] An opening formed in the battery pack refrigerant supply pipe can be connected to the inlet.

[0033] At least one of the inlet and the outlet can include a sealing member around an outer circumference thereof, and the sealing member around the inlet can be positioned between the supply pipe and the battery pack refrigerant supply pipe.

[0034] The battery pack can further include a thermal resin layer positioned between the bottom of the module frame and the battery cell stack.

[0035] Advantageous effects

[0036] According to embodiments of the present application, a battery module having improved cooling performance through an integrated structure of a module frame and a heat sink can be provided.

[0037] In addition, the end plate, the module frame, and the heat sink can be fixed together through fastening, thereby simplifying a manufacturing process and improving assemblability between the components.

[0038] In addition, costs can be reduced by removing unnecessary cooling structures and fastening structures, and space utilization can be improved, thereby improving capacity or output of the battery module. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 A perspective view of a conventional battery module is shown.

[0040] Figure 2 A cross-sectional view taken along line A-A' of Figure 1 is shown.

[0041] Figure 3 A partial perspective view of a battery pack according to embodiments of the present application is shown.

[0042] Figure 4 An exploded perspective view of a battery module included in Figure 3 is shown.

[0043] Figure 5 A cross-sectional view of a portion of a cross-section taken along line B of Figure 3 is shown.

[0044] Figure 6 A perspective view of an end plate, a U-shaped frame, and a heat sink included in Figure 4 is shown.

[0045] Figure 7 A plan view of the battery module of Figure 4 when viewed from below is shown.

[0046] Figure 8 A perspective view of a heat sink included in the battery module of Figure 4 is shown. DETAILED DESCRIPTION

[0047] Hereinafter, the present application will be described more fully with reference to the accompanying drawings, in which embodiments of the application are shown. As those skilled in the art would realize, the described embodiments can be modified in various different ways, all without departing from the spirit or scope of the application.

[0048] For the sake of clarity, portions or components not related to the description have been omitted, and the same or similar constituent elements are designated by the same reference numerals throughout the specification.

[0049] Also, in the drawings, the size and thickness of each element are arbitrarily shown for convenience of description and the present disclosure is not necessarily limited to what is shown in the drawings. In the drawings, the thickness of layers, films, panels, regions, and the like is exaggerated for clarity. In the drawings, the thickness of some layers and regions is exaggerated for convenience of description.

[0050] It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. Also, the use of the term "on" or "above" in the specification denotes that an object is positioned above or below another object, and does not necessarily mean that the object is positioned on the upper side of the other object based on the direction of gravity.

[0051] Also, unless explicitly described to the contrary, the word "comprise" and variations such as "comprises" or "comprising" will be understood to imply the inclusion of stated elements but not the exclusion of any other elements.

[0052] Also, throughout the specification, the phrase "in plan view" or "on a plan view" means that the object portion is observed from the top, and the phrase "in cross-sectional view" or "on a cross-section" means that a cross-section formed by vertically cutting the object portion is observed from the side.

[0053] Figure 3 A partial perspective view of a battery pack according to an embodiment of the present application is shown, Figure 4 An exploded perspective view of a battery module included in Figure 3 A battery pack according to an embodiment of the present application is shown.

[0054] Referring to Figure 3 and Figure 4 A battery pack 1000 according to an embodiment of the present application includes a battery module 100, and the battery module 100 includes a battery cell stack 200 in which a plurality of battery cells 110 are stacked, a module frame 300 for accommodating the battery cell stack 200, an end plate 600 covering front and rear surfaces (y-axis direction) of the battery cell stack 200 and coupled to the module frame 300, and a heat sink 500 located below a bottom 321 of the module frame 300.

[0055] The bottom 321 of the module frame 300 constitutes an upper plate of the heat sink 500, and a mounting and fixing structure of the end plate 600, the module frame 300, and the heat sink 500 is formed in a common fastening method. The common fastening method will be described in detail below with reference to Figure 5 and Figure 6 The common fastening method will be described in detail below with reference to

[0056] The battery pack 1000 according to the present embodiment can further include a battery pack frame 1100 coupled to the module frame 300, and the battery pack frame 1100 can be positioned below the heat sink 500. The module frame 300 can be coupled to the battery pack frame 1100 through a fixing member included in the installation fixing structure.

[0057] First, the battery cell 110 is preferably a pouch-type battery cell. The pouch-type battery cell can be manufactured by accommodating an electrode assembly in a pouch-type case including a laminated sheet of a resin layer and a metal layer, and then heat-fusing a sealing portion of the pouch-type case. The battery cell 110 can be formed to have a rectangular sheet shape structure.

[0058] A plurality of battery cells 110 can be constituted, and the plurality of battery cells 110 are stacked to be electrically connected to each other to form a battery cell stack 200. Specifically, as shown in FIG. 1B, a plurality of battery cells 110 can be stacked in a direction parallel to the x-axis. Figure 4

[0059] The module frame 300 accommodating the battery cell stack 200 can include an upper cover 310 and a U-shaped frame 320.

[0060] The U-shaped frame 320 can include a bottom portion 321 and two side portions 322 extending upward from both ends of the bottom portion 321. The bottom portion 321 can cover a lower surface (an opposite direction of the z-axis) of the battery cell stack 200, and the side portions 322 can cover both side surfaces (the x-axis direction and an opposite direction of the x-axis direction) of the battery cell stack 200.

[0061] The upper cover 310 can be formed to have a single plate shape structure surrounding a remaining upper surface (z-axis direction) except for the lower surface and the both side surfaces surrounded by the U-shaped frame 320. The upper cover 310 and the U-shaped frame 320 can be coupled to each other in a state in which the corners corresponding to each other are in contact with each other by welding or the like to form a structure in which the battery cell stack 200 is covered up and down and left and right. The battery cell stack 200 can be physically protected by the upper cover 310 and the U-shaped frame 320. For this purpose, the upper cover 310 and the U-shaped frame 320 can include a metal material having a predetermined strength.

[0062] Meanwhile, although not specifically shown, the module frame 300 according to a modified example can be a single frame in the form of a metal plate in which an upper surface, a lower surface, and both side surfaces are integrated. That is, the U-shaped frame 320 and the upper cover 310 are not coupled to each other, but can be manufactured by extrusion molding and have a structure in which an upper surface, a lower surface, and both side surfaces are integrated.

[0063] ​The end plate 600 can be positioned to cover positions of the front surface (y-axis direction) and the rear surface (the opposite direction of the y-axis) of the battery cell stack 200. The end plate 600 can physically protect the battery cell stack 200 and other electronic components from external impact, and the end plate 600 can be provided with a battery module mounting structure to fix the battery module to the battery stack frame.

[0064] Meanwhile, although not specifically shown, a bus bar frame in which a bus bar is installed and an insulating cover for electrical insulation can be positioned between the battery cell stack 200 and the end plate.

[0065] Hereinafter, the common fastening method will be described in detail.

[0066] Figure 5 A cross-sectional view showing a portion of a cross section taken along a line B of Figure 3 A cross-sectional view showing a portion of a cross section taken along a line B of Figure 6 A perspective view showing an end plate, a U-shaped frame, and a heat sink included in the battery module of Figure 4

[0067] Referring to Figures 3 to 6 , the end plate 600 can include a first mounting portion 640 extending in a protruding direction (y-axis direction) of an electrode lead protruding from a battery cell 110 included in the battery cell stack 200. In other words, the first mounting portion 640 can protrude from the other side surface opposite to one side surface on which the end plate 600 and the battery cell stack 200 are positioned.

[0068] The module frame 300 can include a second mounting portion 340 extending from the bottom portion 321 along the first mounting portion 640. The heat sink 500 can include a third mounting portion 540 extending along the first mounting portion 640.

[0069] First, second, and third through holes 641, 341, and 541 can be formed in the first, second, and third mounting portions 640, 340, and 540, respectively. In other words, the first through hole 641 can be formed in the first mounting portion 640, the second through hole 341 can be formed in the second mounting portion 340, and the third through hole 541 can be formed in the third mounting portion 540. The first, second, and third through holes 641, 341, and 541 can be formed to penetrate in a direction perpendicular to the bottom portion 321 (z-axis direction).

[0070] All of the first, second, and third mounting portions 640, 340, and 540 can be configured to overlap each other, and thus, positions of the first, second, and third through holes 641, 341, and 541 can be positioned to correspond to each other.

[0071] ​Fastening holes 1110 corresponding to the first through hole 641, the second through hole 341, and the third through hole 541 can be formed in the battery pack frame 1100, and the mounting bolt 700 can pass through the first through hole 641, the second through hole 341, and the third through hole 541 to be coupled to the fastening holes 1110. In this case, the battery pack refrigerant supply pipe 1200 to be described below can be designed to pass through avoiding the mounting bolt 700 on the battery pack frame 1100.

[0072] The mounting bolt 700 includes a head 710 at an upper end thereof, and the head 710 preferably has a larger diameter than the first through hole 641 for fixation.

[0073] The mounting and fixation of the end plate 600, the module frame 300, and the heat sink 500 can be formed by the first mounting portion 640, the second mounting portion 340, the third mounting portion 540, and the mounting bolt 700 in a common fastening method. That is, the above-described components can be commonly fixed to the battery pack frame 1100.

[0074] Unlike performing the mounting and fixation of the respective components, since the fixation is performed by the above-described common fastening method, the manufacturing process of the battery pack 1000 according to the present embodiment can be simplified, and the assemblability between the components can be improved.

[0075] Further, since the common fastening method is implemented by reducing unnecessary fastening structures, it is possible to reduce costs and improve the space utilization of the battery pack.

[0076] Hereinafter, the integrated cooling structure of the module frame 300 and the heat sink 500 will be described in detail.

[0077] Figure 7 A plan view of a battery module viewed from below is shown, Figure 4 A perspective view of a heat sink included in the battery module is shown. Figure 8 Figure 4

[0078] Referring to Figure 4 , Figure 5 , Figure 7 and Figure 8 , the bottom portion 321 of the module frame 300 constitutes an upper plate of the heat sink 500, and the supply pipe 510 of the heat sink 500 and the bottom portion 321 of the module frame 300 can form a refrigerant flow path.

[0079] Specifically, the supply pipe 510 of the heat sink 500 can be a U-shaped pipe, and the bottom portion 321 can be located at an open upper side of the U-shaped pipe. Here, the U-shaped pipe refers to a pipe having a U-shaped cross section. Figure 4 ​​The cross-section of the supply pipe 510 cut along the xz plane or the yz plane is U-shaped. That is, the open upper structure is represented as a U-shaped pipe. As the heat sink 500 comes into contact with the bottom 321, the space between the supply pipe 510 and the bottom 321 becomes an area for the flow of refrigerant, i.e., a flow path of the refrigerant. Accordingly, the bottom 321 can be in direct contact with the refrigerant.

[0080] The manufacturing method of the supply pipe 510 of the heat sink 500 is not particularly limited, however, by providing a structure recessed with respect to the plate-shaped heat sink 500, a U-shaped supply pipe 510 having an open upper side can be formed.

[0081] Meanwhile, as Figure 5 indicated, a thermal resin layer 400 including a thermal resin can be positioned between the bottom 321 of the module frame 300 and the battery cell stack 200. The thermal resin layer 400 can be formed by applying the thermal resin to the bottom 321 and curing the applied thermal resin.

[0082] The thermal resin includes a thermally conductive adhesive material, and in particular, can include at least one of a silicon material, a polyurethane material, and an acrylic material. The thermal resin, since it is liquid during application and is cured after application, can be used to fix one or more battery cells 110 constituting the battery cell stack 200. Further, it has excellent thermal conductivity characteristics, so that it can rapidly transfer heat generated in the battery cells 110 to the lower side of the battery module.

[0083] In Figure 2 the conventional battery module 10 as

[0084] On the other hand, the battery module 100 according to the present embodiment can implement a cooling integrated structure of the module frame 300 and the heat sink 500 to further improve cooling performance. In particular, heat generated in the battery cells 110 can pass through the thermal resin layer 400, the bottom 321 of the module frame 300, and the refrigerant to be transferred to the outside of the battery module 100. By removing the conventional unnecessary cooling structure, the heat transfer path can be simplified, and the air gap between the layers can be reduced, so that the cooling efficiency or performance can be improved. In particular, since the bottom 321 is constituted by the upper plate of the heat sink 500, so that the bottom 321 is in direct contact with the refrigerant, it has the advantage that more direct cooling can be performed by the refrigerant. It can be compared with the prior art as Figure 2 indicated.

[0085] Further, by removing unnecessary cooling structures, the height of the battery module 100 is reduced, thereby reducing costs and improving the space utilization of the battery pack 1000. Further, since the battery module 100 can be disposed compactly, the capacity or output of the battery pack 1000 can be improved.

[0086] Meanwhile, the bottom 321 can be joined to the portion of the heat sink 500 where the supply pipe 510 is not formed, by welding. The present embodiment, by the cooling integration structure of the bottom 321 of the module frame 300 and the heat sink 500, as described above, can improve the cooling performance, can support the load of the battery cell stack 200 accommodated in the module frame 300, and can improve the rigidity of the battery module 100.

[0087] In order to efficiently cool, preferably, as Figure 7 As shown, the supply pipe 510 is integrally formed in the bottom 321 of the module frame 300. To this end, the supply pipe 510 can be bent at least once to be connected from one side to the other side. Specifically, preferably, the supply pipe 510 can be bent several times to integrally form the supply pipe 510 in the bottom 321.

[0088] Meanwhile, the supply pipe 510 according to the present embodiment can include an inlet 520 for introducing refrigerant and an outlet 530 for discharging refrigerant. Specifically, when the supply pipe 510 is connected from one side to the other side, the inlet 520 can be provided at one lower end portion of the supply pipe 510, and the outlet 530 can be provided at the other lower end portion of the supply pipe 510.

[0089] The battery pack 1000 can include a battery pack refrigerant supply pipe 1200 between the battery pack frame 1100 and the heat sink 500 to supply refrigerant to the supply pipe 510.

[0090] An opening 1210 can be formed in the battery pack refrigerant supply pipe 1200, and the opening 1210 can be connected to the inlet 520. Specifically, the opening 1210 can be provided at a position corresponding to the inlet 520 while facing the supply pipe 510, to be connected to the inlet 520 and to be in contact with each other with the inlet 520. Although not specifically shown, however, an opening connected to the outlet 530 can be formed in the battery pack refrigerant discharge pipe (not shown) in the same manner.

[0091] Accordingly, the refrigerant moving along the battery pack refrigerant supply pipe 1200 can be introduced into the supply pipe 510 of the heat sink 500 through the inlet 520. The refrigerant moving along the supply pipe 510 can be recovered to the battery pack refrigerant discharge pipe (not shown) through the outlet 530.

[0092] Meanwhile, at least one of the inlet 520 and the outlet 530 can include a sealing member 521 around the outer circumference thereof. The sealing member 521 around the inlet 520 can be positioned between the supply pipe 510 and the battery pack refrigerant supply pipe 1200, and the sealing member around the outlet 530 can be positioned between the supply pipe 510 and the battery pack refrigerant discharge pipe (not shown). By the sealing member 521, when the refrigerant is introduced and discharged, it is possible to prevent the refrigerant from leaking. Although there is no limitation on the structure of the sealing member 521 according to the present embodiment, a gasket-shaped member or a valve port member illustrated can be applied.

[0093] Further, as Figure 5 indicated, since the end plate 600, the module frame 300, the heat sink 500, and the battery pack refrigerant supply pipe 1200 are firmly in direct contact with each other by the fastening force of the mounting bolt 700 according to the common fastening method, it is possible to reduce the possibility of refrigerant leakage between them.

[0094] Meanwhile, the refrigerant is a medium for cooling, and is not particularly limited, and can be a coolant.

[0095] Meanwhile, a partition wall 511 can be formed in the supply pipe 510. The partition wall 511 can protrude upward to form a structure extending along the supply pipe 510. By increasing the width of the supply pipe 510 and forming the partition wall 511 at the center thereof and by reducing the width of the refrigerant flow path, it is possible to minimize the pressure drop of the refrigerant and reduce the temperature deviation of the refrigerant.

[0096] In the present invention, although terms indicating directions such as front, rear, left, right, up, and down are used, these terms are only for convenience of explanation, and can be changed according to the position of the target object or the observer.

[0097] One or more battery modules according to the present embodiment as described above can be installed together with various control and protection systems such as a battery management system (BMS) and a cooling system to form a battery pack.

[0098] The battery module or the battery pack can be applied to various devices. Specifically, it can be applied to transportation equipment such as an electric bicycle, an electric vehicle, a hybrid vehicle, etc., but is not limited thereto, and can be applied to various devices that can use a secondary battery.

[0099] Although the present invention has been described in connection with what is presently considered to be practical embodiments, it is to be understood that the present invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

[0100] Explanation of reference numerals

[0101] 100: battery module

[0102] 110: battery cell

[0103] 200: battery cell stack

[0104] 300: module frame

[0105] 310: upper cover

[0106] 320: U-shaped frame

[0107] 400: thermal resin layer

[0108] 500: heat sink

[0109] 510: supply tube

[0110] 600: end plate

[0111] 700: mounting bolt

[0112] 1000: battery pack

[0113] 1100: battery pack frame

[0114] 1200: battery pack refrigerant supply tube

Claims

1. A battery pack comprising: a cell stack in which a plurality of cells are stacked; a module frame that accommodates the cell stack; end plates that cover front and rear surfaces of the cell stack and are coupled to the module frame; and a heat sink that is located below a bottom of the module frame, wherein the bottom of the module frame constitutes an upper plate of the heat sink, and mounting and fixing structures of the end plates, the module frame, and the heat sink are formed in a common fastening method, wherein the battery pack further comprises: a battery pack frame that is located below the heat sink and is coupled to the module frame, wherein the mounting and fixing structures are coupled to the battery pack frame, wherein the end plates include first mounting portions that extend in a protruding direction of electrode lead wires that protrude from the cells, the module frame includes second mounting portions that extend from the bottom along the first mounting portions, the heat sink includes third mounting portions that extend along the first mounting portions, first, second, and third through holes are respectively formed in the first, second, and third mounting portions, and positions of the first, second, and third through holes are set to correspond to each other, wherein the battery pack further comprises: mounting bolts that pass through the first, second, and third through holes and are coupled to fastening holes of the battery pack frame. 2.The battery pack according to claim 1, wherein an upper end of the mounting bolt includes a head, and a diameter of the head is greater than a diameter of the first through hole. The supply pipe of the heat sink and the bottom form a refrigerant flow path.

3. The battery pack of claim 1, wherein, The bottom is in direct contact with a refrigerant.

4. The battery pack of claim 3, wherein, The supply pipe is a U-shaped pipe, and the bottom is located at an open upper side of the U-shaped pipe.

5. The battery pack of claim 3, wherein, The supply pipe includes an inlet for introducing a refrigerant and an outlet for discharging the refrigerant.

6. The battery pack of claim 3, wherein, 7.The battery pack according to claim 6, further comprising: a battery pack refrigerant supply pipe that is located between the battery pack frame and the heat sink to supply the refrigerant to the supply pipe. An opening formed in the battery pack refrigerant supply pipe is connected to the inlet.

8. The battery pack of claim 7, wherein, 9.The battery pack according to claim 7, wherein at least one of the inlet and the outlet includes a sealing member that surrounds an outer periphery of the at least one of the inlet and the outlet, and the sealing member that surrounds the inlet is located between the supply pipe and the battery pack refrigerant supply pipe. a thermal resin layer that is located between the bottom of the module frame and the cell stack.

10. The battery pack of claim 1, further comprising: 11.A battery pack device comprising the battery pack according to claim 1. ​

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