Battery system for electric vehicle

Abstract

A battery system for an electric vehicle includes a plurality of battery packs, a plurality of cooling blocks, a refrigerant supply pipe, and a refrigerant recovery pipe, in which the plurality of battery packs are replaceably mounted to a plurality of battery pack mounting positions sequentially arranged in a longitudinal direction of the electric vehicle; the plurality of cooling blocks are respectively arranged above the battery pack; a refrigerant supply pipe disposed on a first side of the plurality of battery pack mounting positions while extending in a longitudinal direction, and formed to supply a refrigerant to the cooling block; a refrigerant recovery tube is disposed on a second side of the plurality of battery pack mounting positions while extending in the longitudinal direction, and the refrigerant recovery tube is formed to recover refrigerant from the cooling block.

Description

Technical Field

[0001] The present invention relates to a battery system mounted to an electric vehicle, and more particularly, to a cooling device of the battery system. Background Art

[0002] The electric vehicle is equipped with a battery system for supplying electric power to a motor that generates a driving force for the electric vehicle.

[0003] Recently, electric vehicles use replaceable battery systems to overcome the relatively long charging time.

[0004] At the same time, the battery system must be equipped with proper cooling to ensure stable output.

[0005] The above description provided as a related art of the present invention is only for helping to understand the background of the present invention, and should not be construed as being included in the related art known to a person of ordinary skill in the art. Summary of the invention

[0006] The present invention provides a battery system for an electric vehicle. The battery system is configured to selectively install a plurality of battery packs in the vehicle as needed, and is configured to selectively perform cooling only on the installed battery packs to maximize the energy efficiency of the electric vehicle and maintain stable output performance of the battery system, ultimately significantly improving the marketability of the electric vehicle.

[0007] In order to achieve the above-mentioned purpose, a battery system for an electric vehicle in one embodiment of the present invention may include: a plurality of battery packs and a plurality of cooling blocks, wherein the plurality of battery packs are installed in a replaceable manner to a plurality of battery pack installation positions arranged in sequence along the longitudinal direction of the vehicle; and a plurality of cooling blocks are respectively arranged above the battery packs. The battery system further includes: a refrigerant supply pipe, which is arranged on a first side of the plurality of battery pack installation positions and extends in the longitudinal direction of the vehicle, and the refrigerant supply pipe is formed to supply refrigerant to the cooling block. The battery system further includes a refrigerant recovery pipe, which is arranged on a second side of the plurality of battery pack installation positions and extends in the longitudinal direction of the vehicle, and is formed to recover refrigerant from the cooling block.

[0008] In one embodiment, the cooling block and the refrigerant supply pipe and the cooling block and the refrigerant recovery pipe can be arranged so that the refrigerant supply state and the refrigerant blocking state can be switched to each other according to the vertical relative displacement of the cooling block and the refrigerant supply pipe and the refrigerant recovery pipe.

[0009] In one embodiment, the battery pack mounting position can be a space separated by: i) a longitudinal beam that constitutes a frame of the vehicle and is arranged at two opposite parts of the frame while extending in the longitudinal direction; and ii) a plurality of cross beams that are arranged to connect one of the longitudinal beams to another of the longitudinal beams (e.g., opposite longitudinal beams) while extending in the lateral direction of the vehicle.

[0010] The refrigerant supply pipe and the refrigerant recovery pipe may be installed inside opposing longitudinal beams, respectively.

[0011] In one embodiment, the upward curved pipes can be connected to the refrigerant supply pipe and the refrigerant recovery pipe respectively, each curved pipe is arranged for each battery pack mounting position, so that the refrigerant supply pipe and the refrigerant recovery pipe can pass through the body interior of the longitudinal beam to connect to the cooling block.

[0012] In another embodiment, each of the cooling blocks may have cooling block joints at two opposing portions thereof, and the cooling block joints may allow each of the cooling blocks to be removably coupled to the bent pipe of the refrigerant supply pipe and the bent pipe of the refrigerant recovery pipe by vertically moving relative to the frame.

[0013] In one embodiment, the bend pipe and the cooling block joint may have a shutoff valve, respectively. When the bend pipe and the cooling block joint are engaged with each other, the shutoff valve may allow the refrigerant to flow. When the bend pipe and the cooling block joint are separated from each other, the shutoff valve blocks the refrigerant from flowing.

[0014] In one embodiment, the refrigerant supply pipe and the refrigerant recovery pipe may respectively include pipe joints having threads on the outer peripheral surface, and the pipe joints may pass through the longitudinal beam to be coupled to the bent pipe. The fixing nut may be coupled to the threads of the pipe joints and the refrigerant supply pipe and the refrigerant recovery pipe may be fixed to the longitudinal beam.

[0015] A thermal interface material may be disposed between each of the cooling blocks and each of the battery packs.

[0016] In addition, in order to achieve the above-mentioned purpose, the battery system for electric vehicles of the present invention includes: a frame and one or more battery packs, wherein the frame provides multiple battery pack installation positions along the longitudinal direction of the vehicle by connecting multiple cross beams of at least two longitudinal beams to each other; one or more battery packs are arranged in multiple battery pack installation positions in a replaceable manner. The battery system further includes: a cooling block and a refrigerant flow mechanism, wherein the cooling block is separately provided for the battery pack installation position to conduct heat with the upper surface of the battery pack; the refrigerant flow mechanism is provided on the frame to supply and recover the refrigerant circulating through the cooling block.

[0017] The refrigerant flow mechanism may include a refrigerant supply pipe and a refrigerant recovery pipe which are disposed in two longitudinal beams of the frame and are respectively configured to deliver the refrigerant to the cooling block and receive the refrigerant from the cooling block.

[0018] The refrigerant supply pipe and the refrigerant recovery pipe may respectively have a plurality of pipe joints passing through the vehicle body inner surface of the longitudinal beam. In one embodiment, a fixing nut may be fastened to the pipe joint to fix the refrigerant supply pipe and the refrigerant recovery pipe to the longitudinal beam.

[0019] Each of the pipe joints provided in the refrigerant supply pipe and each of the pipe joints provided in the refrigerant recovery pipe may be provided at the same relative position for each battery pack mounting position.

[0020] The bent pipe extending upward may be coupled to the pipe joint. The cooling block may include cooling block joints at two opposite portions thereof, respectively, and the cooling block joints may be coupled to the bent pipe.

[0021] The bend pipe and the cooling block joint may have a shutoff valve respectively. When the bend pipe and the cooling block joint are engaged with each other, the shutoff valve may allow the refrigerant to flow. When the bend pipe and the cooling block joint are separated from each other, the shutoff valve may block the refrigerant from flowing.

[0022] A thermal interface material may be disposed between a lower surface of each cooling block and an upper surface of each of the battery packs.

[0023] The refrigerant supply pipe and the refrigerant recovery pipe may be configured to circulate the refrigerant in parallel to the battery pack mounted to the battery pack mounting position.

[0024] According to the present invention, multiple battery packs can be selectively installed to the vehicle as needed, and cooling can be selectively performed only on the installed battery packs, so that the energy efficiency of the vehicle can be maximized, the output performance of the battery system can be kept stable, and ultimately the marketability of the electric vehicle can be significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A perspective view showing a battery system for an electric vehicle according to an embodiment of the present invention;

[0026] Figure 2 Figure 2 shows the case where there is no cooling block. Figure 1 A perspective view of a battery system for an electric vehicle;

[0027] Figure 3 for Figure 2 Exploded stereogram of

[0028] Figure 4Figure 1 shows the case where there is no part of the battery pack on the lower side of the battery system Figure 1 A schematic diagram of a battery system for an electric vehicle;

[0029] Figure 5 To show Figure 4 A schematic diagram of a battery system in FIG. 1 taken from the bottom side;

[0030] Figure 6 To show the setting Figure 4 A schematic diagram of a refrigerant supply pipe and a refrigerant recovery pipe inside a longitudinal beam;

[0031] Figures 7 to 9 are schematic diagrams sequentially showing the joining structure and joining process of the refrigerant supply pipe or the refrigerant recovery pipe and the longitudinal beam; and

[0032] Fig.10 For along Figure 1 A cross-sectional view taken along line X-X in FIG.

[0033] The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present invention are described in detail with reference to the accompanying drawings, and the same or similar components are given the same reference numerals regardless of the numbers of the drawings, and description is not repeated.

[0035] The component suffixes "module" and "component" used in the following description are given or mixed for convenience in writing the specification only, and do not have different meanings or functions by themselves.

[0036] In the following description, if it is determined that the detailed description of the known technology related to the present invention makes the subject matter of the embodiment described herein unclear, the detailed description is omitted. In addition, the drawings are provided only to facilitate the understanding of the embodiments disclosed in the specification, the technical spirit disclosed in the specification is not limited by the drawings, and all modifications, equivalents and substitutions should be understood to be included in the spirit and scope of the present invention.

[0037] Terms including ordinal numbers such as "first", "second", etc. may be used to describe various components, but these components should not be construed as being limited to these terms. These terms are only used to distinguish one component from another.

[0038] It should be understood that when an element is referred to as being “connected to” or “engaged to” another element, it can be directly connected to or directly engaged to the other element, or connected to or engaged to the other element with other elements interposed therebetween. On the other hand, it should be understood that when an element is referred to as being “directly connected to” or “directly engaged to” another element, it can be connected to or engaged to the other element without other elements interposed therebetween.

[0039] Unless the context clearly indicates otherwise, singular forms are intended to include plural forms.

[0040] It should be further understood that the terms "including" or "having" used in this specification indicate the presence of the features, steps, operations, components, parts or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, components, parts or combinations thereof. When a component, device, element, etc. of the present invention is described as having a purpose or performing an operation, function, etc., the component, device or element should be considered as "configured to" meet the purpose or perform the operation or function.

[0041] Reference Figures 1 to 10 According to an embodiment of the present invention, a battery system for an electric vehicle includes: a plurality of battery packs 3, which are installed in a replaceable manner to a plurality of battery pack installation positions 1 arranged in sequence along the longitudinal direction of the vehicle. The battery system further includes: a plurality of cooling blocks 5 and a refrigerant supply pipe 7, wherein the plurality of cooling blocks 5 are respectively arranged above the battery packs 3; the refrigerant supply pipe 7 is arranged on a first side of the plurality of battery pack installation positions 1, while extending in the longitudinal direction of the vehicle, and is configured to supply refrigerant to the cooling blocks 5. The battery system further includes a refrigerant recovery pipe 9, which is arranged on a second side of the plurality of battery pack installation positions 1, while extending in the longitudinal direction of the vehicle, and is configured to recover refrigerant from the cooling blocks 5.

[0042] In one embodiment, the cooling block 5 and the refrigerant supply pipe 7 and the cooling block 5 and the refrigerant recovery pipe 9 are arranged so that the supply state and the blocking state of the refrigerant are switched to each other by the vertical relative displacement of the cooling block 5 and the refrigerant supply pipe 7 and the refrigerant recovery pipe 9. In other words, based on the vertical displacement of the cooling block 5 relative to the refrigerant supply pipe 7 and the refrigerant recovery pipe 9, the cooling block 5, the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 can be transformed between the refrigerant supply state and the blocking state.

[0043] In one embodiment of the present invention, a plurality of battery packs 3 are selectively mounted to a plurality of battery pack mounting positions 1 arranged in the longitudinal direction of the vehicle. A cooling block 5 is located above each battery pack 3 for cooling the heat generated from the battery pack 3, and the connection state of the cooling block 5 (i.e., the state in which the refrigerant is supplied or blocked) is switched by vertical relative displacement with the refrigerant supply pipe 7 and the refrigerant recovery pipe 9, so that the cooling block 5 can be easily attached and detached to match the number of battery packs 3 mounted to the vehicle.

[0044] The battery pack installation position 1 is a space partitioned by a longitudinal beam 13 and a plurality of cross beams 15. The longitudinal beams 13 constitute a frame 11 of the vehicle and are arranged at two opposite portions of the frame while extending long in the longitudinal direction, and the plurality of cross beams 15 are arranged to connect the longitudinal beams 13 to each other while extending in the transverse direction of the vehicle.

[0045] Furthermore, all the battery packs 3 are formed in the same standard and can be selectively mounted to the battery pack mounting position 1 as described above.

[0046] Therefore, when the vehicle is mainly used for short-distance driving, one of the battery packs 3 is mounted to only one of the plurality of battery pack mounting positions 1 to significantly reduce the weight of the vehicle, thereby being able to reduce unnecessary energy consumption in vehicle operation.

[0047] Furthermore, when the vehicle is mainly used for long-distance driving, all battery packs 3 are mounted to a plurality of battery pack mounting positions 1 to significantly increase the cruising range of the vehicle, thereby being able to maximize the usability of the vehicle.

[0048] As described above, when the battery pack 3 is selectively mounted to the plurality of battery pack mounting positions 1 provided in the frame 11 of the vehicle, the cooling block 5 is selectively mounted to the vehicle to cool only the battery pack 3 mounted to the vehicle. Accordingly, by the refrigerant flowing only into the mounted cooling block 5, the optimal cooling performance of the battery pack 3 mounted to the vehicle can be ensured, unnecessary flow of the refrigerant can be prevented, and only necessary flow of the refrigerant is performed. Ultimately, the energy efficiency of the vehicle can be maximized.

[0049] Therefore, when the number of installed battery packs 3 changes according to the use of the vehicle, the vehicle body is separated from the frame 11 of the vehicle, and then the cooling block 5 is selectively installed only above the battery pack mounting position 1 where the battery pack 3 is installed, and additionally, the cooling block 5 installed above the battery pack mounting position 1 where the battery pack 3 is not installed can be selectively removed.

[0050] For reference, in one embodiment, the battery pack 3 may be mounted to the crossbar 15 of the frame 11 .

[0051] exist Figure 3In the figure, the forward protruding portion of the battery pack 3 can be a joint portion 6 configured to mount the battery pack 3 to the crossbeam 15 . Of course, the rear portion of the battery pack 3 also has a joint portion 6 that is the same as the front joint portion 6 .

[0052] In other words, in the embodiment, the cross beam 15 of the frame 11 is used as a structural support member for mounting the battery pack 3, and the longitudinal beam 13 of the frame 11 is used to store the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 for supplying refrigerant to the cooling block 5 and recovering refrigerant from the cooling block 5.

[0053] The refrigerant supply pipe 7 and the refrigerant recovery pipe 9 are installed inside the longitudinal beams 13 on two opposite sides, respectively.

[0054] The upwardly bent pipes 17 are connected to the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 , respectively, and each upwardly bent pipe 17 is arranged for each battery pack mounting position 1 so that the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 pass through the vehicle body interior of the longitudinal beam 13 to be connected to the cooling block 5 .

[0055] In addition, each cooling block 5 has a cooling block joint 19 at two opposite parts thereof, and the cooling block joint 19 allows each cooling block 5 to be attached and detached from the bent pipe 17 of the refrigerant supply pipe 7 and the bent pipe 17 of the refrigerant recovery pipe 9 by vertically moving relative to the frame 11.

[0056] Therefore, when the cooling block 5 moves upward from the refrigerant supply pipe 7 and the refrigerant recovery pipe 9, the cooling block joint 19 of the cooling block 5 is removed from the bent pipe 17, so that the cooling block 5 is separated from the refrigerant supply pipe 7 and the refrigerant recovery pipe 9. When the cooling block 5 moves downward, the cooling block joints 19 located at two opposite parts of the cooling block 5 are engaged to the bent pipe 17, so that the cooling block 5 is connected to the refrigerant supply pipe 7 and the refrigerant recovery pipe 9.

[0057] The bent pipe 17 and the cooling block joint 19 are respectively provided with a shut-off valve 21. When the bent pipe 17 and the cooling block joint 19 are engaged with each other, the shut-off valve 21 allows the refrigerant to pass through the bent pipe 17 and the cooling block joint 19, and when the bent pipe 17 and the cooling block joint 19 are separated from each other, the shut-off valve 21 blocks the refrigerant flow.

[0058] Therefore, as described above, even when the cooling block 5 is separated from the refrigerant supply pipe 7 and the refrigerant recovery pipe 9, the refrigerant can be prevented from leaking from the cooling block 5, the refrigerant supply pipe 7 and the refrigerant recovery pipe 9, and the cooling block 5 can be easily separated from the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 and installed.

[0059] For reference, the stop valve 21 may use a method that can be opened and closed by vertical displacement of the cooling block 5 and the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 .

[0060] The refrigerant supply pipe 7 and the refrigerant recovery pipe 9 include pipe joints 23 having threads on the outer peripheral surface, and the pipe joints 23 pass through the longitudinal beam 13 to be coupled to the bent pipe 17. Fixing nuts 25 are coupled to the threads of the pipe joints 23 to fix the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 to the longitudinal beam 13.

[0061] For reference, Figures 7 to 9 1 and 2 are schematic diagrams sequentially showing a process in which the pipe joints 23 provided in the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 are fixed by the fixing nuts 25 while passing through the inner wall of the longitudinal beam 13 as described above.

[0062] As described above, the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 are arranged inside the longitudinal beam 13, and the refrigerant flows into the battery pack installation position 1 through the pipe joint 23. Therefore, the battery pack installation position 1 will not be reduced due to the refrigerant supply pipe 7 and the refrigerant recovery pipe 9, and the battery pack 3 can include more battery modules 27.

[0063] A thermal interface material (TIM) is provided between the cooling block 5 and the battery pack 3 , so that the battery pack 3 can be further effectively cooled.

[0064] The refrigerant supply pipe 7 and the refrigerant recovery pipe 9 are configured to supply cooled refrigerant through the refrigerant supply pipe 7 and further configured to recover heated refrigerant through the refrigerant recovery pipe 9, wherein a separate refrigerant circulation device or the like is connected to the refrigerant supply pipe 7 and the refrigerant recovery pipe 9.

[0065] For reference, Figure 6 Schematic diagram showing a refrigerant supply pipe 7 having a main supply joint 29 connected to a refrigerant cycle device and a refrigerant recovery pipe 9 having a main recovery joint 31 connected to the refrigerant cycle device.

[0066] For reference, from Figure 3 , reference numeral 33 denotes wiring for establishing electrical connection to a battery pack mounted on a vehicle.

[0067] The present invention as described above is further described as follows.

[0068] In other words, a battery system for an electric vehicle according to an embodiment of the present invention includes: a frame 11, one or more battery packs 3, a cooling block 5, and a refrigerant flow mechanism, wherein the frame 11 provides a plurality of battery pack mounting positions 1 along the longitudinal direction of the vehicle by connecting a plurality of cross beams 15 of two longitudinal beams 13 to one another; one or more battery packs 3 are formed in the plurality of battery pack mounting positions 1 in a replaceable manner; the cooling block 5 is separately provided for the battery pack mounting position 1 to conduct heat with the upper surface of the battery pack 3; and the refrigerant flow mechanism is provided in the frame 11 to supply and recover the refrigerant circulated through the cooling block 5.

[0069] The refrigerant flow mechanism is disposed in each of the two longitudinal beams 13 of the frame 11 , and may include a refrigerant supply pipe 7 and a refrigerant recovery pipe 9 configured to deliver the refrigerant to the cooling block 5 and receive the refrigerant from the cooling block 5 .

[0070] The refrigerant supply pipe 7 and the refrigerant recovery pipe 9 have a plurality of pipe joints 23 passing through the vehicle body inner surface of the side member 13. Fixing nuts 25 are fastened to the pipe joints 23, so that the refrigerant supply pipe 7 and the refrigerant recovery pipe 9 are fixed to the side member 13.

[0071] Each of the pipe joints 23 of the refrigerant supply pipe 7 and each of the pipe joints 23 of the refrigerant recovery pipe 9 are located at the same corresponding position in each of the battery pack mounting positions 1 .

[0072] For example, the same corresponding position may be understood as a position spaced a predetermined distance from the mounting position of the battery pack 3 mounted to the battery pack mounting position 1. Even when a plurality of battery pack mounting positions 1 have forms that do not completely match each other, the pipe joint 23 may be installed at a position where the upper surface of the battery pack 3 mounted to the battery pack mounting position 1 and the lower surface of the cooling block 5 accurately match each other.

[0073] The bent pipe 17 extending upward is coupled to the pipe joint 23, and the cooling block 5 may have cooling block joints 19 coupled to the bent pipe 17 at opposite portions thereof.

[0074] The bent pipe 17 and the cooling block joint 19 have stop valves 21, respectively, and when the bent pipe 17 and the cooling block joint 19 are engaged with each other, the stop valves 21 allow the refrigerant to flow. When the bent pipe 17 and the cooling block joint 19 are separated from each other, the stop valves 21 block the refrigerant flow.

[0075] A thermal interface material (TIM) may be disposed between a lower surface of each cooling block 5 and an upper surface of each battery pack 3 .

[0076] The refrigerant supply pipe 7 and the refrigerant recovery pipe 9 are configured to circulate the refrigerant in parallel to the battery pack 3 mounted to the battery pack mounting position 1 .

[0077] Although the present invention has been presented above with respect to the specific embodiments shown in the accompanying drawings, it will be obvious to those skilled in the art that the present invention can be changed and modified in various ways without departing from the scope of the invention as provided in the claims.

Claims

1. A battery system for an electric vehicle, the battery system comprising: a plurality of battery packs which are replaceably mounted to a plurality of battery pack mounting positions arranged sequentially in the longitudinal direction of the electric vehicle; A plurality of cooling blocks are respectively arranged above the plurality of battery packs; a refrigerant supply pipe arranged on a first side of the plurality of battery pack mounting positions while extending in a longitudinal direction of the electric vehicle, the refrigerant supply pipe being configured to supply a refrigerant to the plurality of cooling blocks; as well as A refrigerant recovery pipe is arranged on a second side of the plurality of battery pack mounting positions while extending in a longitudinal direction of the electric vehicle, the refrigerant recovery pipe being configured to recover refrigerant from the plurality of cooling blocks.

2. The battery system for an electric vehicle according to claim 1, wherein: The plurality of cooling blocks and refrigerant supply pipes and the plurality of cooling blocks and refrigerant recovery pipes are arranged to switch the refrigerant supply state and the refrigerant blocking state to each other according to the vertical relative displacement of the plurality of cooling blocks and the refrigerant supply pipes and the refrigerant recovery pipes.

3. The battery system for an electric vehicle according to claim 2, wherein: Multiple battery pack mounting locations are spaces separated by the following components: longitudinal beams constituting a frame of the electric vehicle and arranged at two opposite portions of the frame while extending in a longitudinal direction; and A plurality of cross beams are arranged to connect the opposing longitudinal beams to each other while extending in a lateral direction of the electric vehicle.

4. The battery system for an electric vehicle according to claim 3, wherein: The refrigerant supply pipe and the refrigerant recovery pipe are respectively installed inside opposite longitudinal beams.

5. The battery system for an electric vehicle according to claim 4, wherein: Upward bending pipes are connected to the refrigerant supply pipe and the refrigerant recovery pipe, respectively, and each bending pipe is arranged for each battery pack mounting position so that the refrigerant supply pipe and the refrigerant recovery pipe are connected to a plurality of cooling blocks through the vehicle body interior of the opposite longitudinal beam.

6. The battery system for an electric vehicle according to claim 5, wherein: Each of the plurality of cooling blocks includes cooling block joints at two opposite portions thereof, and the cooling block joints allow each of the plurality of cooling blocks to be removably coupled to the bent pipe of the refrigerant supply pipe and the bent pipe of the refrigerant recovery pipe by vertically moving relative to the frame.

7. The battery system for an electric vehicle according to claim 6, wherein: The elbow and cooling block joints are equipped with stop valves respectively. When the bent pipe and cooling block joints engage each other, the shut-off valve allows the refrigerant to flow, When the bent pipe and the cooling block joint are separated from each other, the shut-off valve blocks the flow of refrigerant.

8. The battery system for an electric vehicle according to claim 6, wherein: The refrigerant supply pipe and the refrigerant recovery pipe respectively include pipe joints having threads on outer peripheral surfaces, the pipe joints passing through opposite longitudinal beams to be engaged to the bent pipes; The retaining nuts engage the threads of the pipe fittings to secure the refrigerant supply pipe and the refrigerant return pipe to the opposing stringers.

9. The battery system for an electric vehicle according to claim 6, wherein: A thermal interface material is disposed between each of the plurality of cooling blocks and each of the plurality of battery packs.

10. A battery system for an electric vehicle, the battery system comprising: a frame that provides a plurality of battery pack mounting locations in a longitudinal direction of the electric vehicle by a plurality of cross beams connecting at least two longitudinal beams to each other; one or more battery packs replaceably disposed in a plurality of battery pack mounting locations; cooling blocks individually provided for a plurality of battery pack mounting locations to conduct heat with an upper surface of one or more battery packs; and A refrigerant flow mechanism is provided on the frame to supply and recover the refrigerant circulating through the cooling block.

11. The battery system for an electric vehicle according to claim 10, wherein: The refrigerant flow mechanism includes a refrigerant supply pipe and a refrigerant recovery pipe, which are disposed in at least two longitudinal beams of the frame and are respectively configured to deliver refrigerant to a cooling block and receive refrigerant from the cooling block.

12. The battery system for an electric vehicle according to claim 11, wherein: The refrigerant supply pipe and the refrigerant recovery pipe respectively have a plurality of pipe joints passing through the inner surface of the vehicle body of at least two longitudinal beams; Fixing nuts are fastened to the plurality of pipe joints to fix the refrigerant supply pipe and the refrigerant recovery pipe to the at least two longitudinal beams.

13. The battery system for an electric vehicle according to claim 12, wherein: Each of the pipe joints provided in the refrigerant supply pipe and each of the pipe joints provided in the refrigerant recovery pipe are provided at the same relative position for each battery pack mounting position.

14. The battery system for an electric vehicle according to claim 13, wherein: The upwardly extending curved pipe is engaged to the pipe joint; The cooling block includes cooling block joints at two opposite portions thereof, respectively, and the cooling block joints are coupled to the bent pipe.

15. The battery system for an electric vehicle according to claim 14, wherein: The elbow and cooling block joints are equipped with stop valves respectively. When the bent pipe and cooling block joints engage each other, the shut-off valve allows the refrigerant to flow, When the bent pipe and the cooling block joint are separated from each other, the shut-off valve blocks the flow of refrigerant.

16. The battery system for an electric vehicle according to claim 10, wherein: A thermal interface material is disposed between a lower surface of each cooling block and an upper surface of each of the one or more battery packs.

17. The battery system for an electric vehicle according to claim 11, wherein: The refrigerant supply pipe and the refrigerant recovery pipe are configured to circulate refrigerant in parallel to one or more battery packs mounted to a plurality of battery pack mounting positions.

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