Battery pack

Abstract

The disclosed invention relates to a battery pack, and in one example, includes a pair of base plates, a center frame interposed between the pair of base plates and longitudinally connected to each base plate on both sides, a pair of side frames longitudinally connected to outer surfaces of the base plates, and a plurality of battery modules mounted on the base plates along a pack space between the center frame and the side frames, wherein the battery module includes a pair of module frames accommodating a plurality of battery cells, and is accommodated in the pack space so as to be disposed in a direction transverse to the center frame and the side frames.

Description

[Technical Field]

[0001] The present invention relates to a battery pack that can improve space utilization within the pack, reduce costs by simplifying the structure of modules and packs, and can be easily modified or expanded to various specifications.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0059686, filed May 16, 2022, and Korean Patent Application No. 10-2022-0136114, filed October 21, 2022, and all contents disclosed in the documents of said Korean patent applications are incorporated herein by reference. [Background technology]

[0003] Unlike primary batteries, secondary batteries are rechargeable and have the potential to be small and have large capacities, which has led to extensive research and development in recent years. Demand for secondary batteries as an energy source is rapidly increasing due to the increasing technological development and demand for mobile devices, as well as the emergence of electric vehicles and energy storage systems in response to modern demands for environmental protection.

[0004] Secondary batteries are classified into coin-type batteries, cylindrical batteries, prismatic batteries, and pouch-type batteries depending on the shape of the battery case. The electrode assembly installed inside the battery case of a secondary battery is a power generating element that can be charged and discharged and is made up of a laminated structure of electrodes and a separator.

[0005] A secondary battery may be in the form of a battery pack, which is a group of multiple battery cells. The battery pack can be installed in devices that require high energy, such as electric vehicles, by increasing the energy density. The battery pack electrically connects multiple battery cells to output a specified amount of power, cools the battery cells that may heat up during operation, and includes various safety devices to respond to emergency situations such as fire.

[0006] One of the key issues for battery packs is increasing the energy density per unit volume. This means that the key is how efficiently the space inside the battery pack can be used. In other words, it is necessary to be able to fit more battery cells into the same pack space, and one solution is to simplify the battery pack structure as much as possible.

[0007] Simplifying the structure of the battery pack is also advantageous from the viewpoint of reducing the production cost of the battery pack, and furthermore, the structure must be designed so that it can be easily adapted to battery packs of various sizes. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Publication No. 2021-0133788 (Published on November 8, 2021) Summary of the Invention [Problem to be solved by the invention]

[0009] An object of the present invention is to provide a battery pack that can improve the space utilization rate inside the pack, reduce costs by simplifying the structure of the module and pack, and can be easily modified or expanded to various specifications.

[0010] However, the technical problems that the present invention aims to solve are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention described below. [Means for solving the problem]

[0011] The present invention relates to a battery pack, and in one example, the battery pack includes a pair of base plates, a center frame interposed between the pair of base plates and longitudinally connected to each base plate on both sides, a pair of side frames longitudinally connected to outer surfaces of the base plates, and a plurality of battery modules mounted on the base plates along a pack space between the center frame and the side frames, wherein the battery modules include a pair of module frames accommodating a plurality of battery cells, and the module frames are accommodated in the pack space so as to be disposed in a direction transverse to the center frame and the side frames.

[0012] The pair of module frames are disposed on both ends of the plurality of battery cells aligned in a line along a thickness direction of the battery cells.

[0013] The module frame is fixed to the side frame with the plurality of battery cells housed therein.

[0014] Furthermore, the module frame can be fixed to other module frames adjacent to it along the longitudinal direction.

[0015] The module frame can also be fixed to the base plate.

[0016] The module frame supports a load in a direction transverse to the center frame and side frames.

[0017] According to an embodiment of the present invention, the battery module may form a temporary battery module including a pair of pre-assembly plates respectively coupled to upper and lower surfaces of the pair of module frames before being housed in the pack space.

[0018] The center frame and the side frames can be connected to the pair of base plates by friction stir welding.

[0019] The pack further includes a front frame and a rear frame that are coupled to the pair of side frames to surround the outer periphery of the pack space, and the side frames, the front frame and the rear frame may have the same shape.

[0020] Meanwhile, according to an embodiment of the present invention, the base plate may include a plurality of cooling channels extending along the longitudinal direction therein.

[0021] Preferably, the cooling channels may be integrally formed with the base plate.

[0022] The cooling channel may have one longitudinal end of the base plate forming an inlet channel, while the other longitudinal end forms an outlet channel.

[0023] The inlet and outlet channels may be coupled to an inlet joint and an outlet joint, respectively, and in one example, the inlet and outlet joints each have one cooling water inlet and one cooling water outlet, and are connected in parallel to the plurality of inlet and outlet channels.

[0024] The inlet and outlet joints may then be connected to the inlet and outlet channels, respectively, by quick couplers. [Effects of the Invention]

[0025] In the battery pack of the present invention having the above configuration, the module frame constituting the battery module supports a load in a direction crossing the center frame and the side frames without providing a separate cross beam in the pack case. Therefore, since there are no weld beads that would occur when connecting the cross beam structure to the pack case, it is possible to densely arrange more battery cells in the same pack space, thereby improving the space utilization rate inside the pack.

[0026] Furthermore, simplifying the structure of the battery module and pack can reduce costs, and the simpler the structure, the easier it is to modify or expand the battery pack to various specifications.

[0027] However, the technical effects that can be obtained by the present invention are not limited to the effects described above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the invention described below. [Brief explanation of the drawings]

[0028] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical concept of the present invention, and therefore the present invention should not be interpreted as being limited solely to the matters depicted in such drawings. [Figure 1] 1 is a diagram illustrating the overall structure of a battery pack according to the present invention. [Figure 2] 1 is a diagram illustrating the structure of a pack case. [Figure 3] 1 is a diagram illustrating a battery module. [Figure 4] 1 is a view illustrating a fixing structure between adjacent battery modules; [Figure 5] 1 is a view illustrating a fixing structure between adjacent battery modules; [Figure 6] 1 is a view illustrating a fixing structure between a battery module and a side frame; [Figure 7] 1 is a view illustrating a fixing structure between a battery module and a base plate; [Figure 8] 1 is a diagram illustrating a cooling channel provided in a battery pack. [Figure 9] 1 is a diagram illustrating a cooling channel provided in a battery pack. DETAILED DESCRIPTION OF THE INVENTION

[0029] Because the present invention can be modified in various ways and can have various embodiments, specific embodiments will be described in detail below.

[0030] However, this is not intended to limit the invention to any particular embodiment, but should be understood to include all modifications, equivalents, or alternatives falling within the spirit and scope of the invention.

[0031] In the present invention, the terms "comprise" and "have" are intended to specify the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should be understood as not precluding the presence or possibility of addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0032] Furthermore, in the present invention, when a layer, film, region, plate, or other portion is described as being "on" another portion, this includes not only the case where it is "directly on" the other portion, but also the case where there is another portion therebetween. Conversely, when a layer, film, region, plate, or other portion is described as being "under" the other portion, this includes not only the case where it is "directly under" the other portion, but also the case where there is another portion therebetween. Furthermore, in this application, being "located on" can include not only the case where it is located at the top, but also the case where it is located at the bottom.

[0033] The present invention relates to a battery pack, and in one example, a pack case that forms a pack space that houses a plurality of battery cells includes a base plate, a center frame, and side frames.

[0034] The center frame is interposed between a pair of base plates and connected to each of the base plates in the longitudinal direction on both sides, and the pair of side frames are connected to the outer surfaces of the base plates in the longitudinal direction, respectively.

[0035] A plurality of battery modules are mounted on the base plate along a pack space between the center frame and the side frames, and each battery module includes a pair of module frames accommodating a plurality of battery cells. Each battery module is accommodated in the pack space such that the module frames are arranged in a direction transverse to the center frame and the side frames, i.e., in the width direction.

[0036] In the battery pack of the present invention having such a configuration, the module frame constituting the battery module supports a load in a direction crossing the center frame and the side frames. In other words, the module frame included in the battery module serves as a cross beam.

[0037] In this way, in the battery pack of the present invention, the pack case does not have a separate cross beam, and the module frame included in the battery module serves as the cross beam. Therefore, since there are no weld beads that would be generated when joining the cross beam structure to the pack case, it is possible to densely arrange more battery cells in the same pack space, thereby improving the space utilization rate inside the pack.

[0038] In addition, the cost can be reduced by simplifying the structure of the module and pack, and the simpler the structure, the easier it is to modify or expand the battery pack to various specifications.

[0039] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings. Hereinafter, directions such as front-back, up-down, left-right, and right-left used to designate relative positions are intended to facilitate understanding of the invention, and unless otherwise specified, are based on directions shown in the drawings.

[0040] (First embodiment) FIG. 1 is a view illustrating the overall structure of a battery pack 10 according to the present invention, and FIG. 2 is a view illustrating the structure of a pack case 100. As shown in FIG.

[0041] The present invention relates to a battery pack 10, in which a pack case 100 forming a pack space for accommodating a plurality of battery cells 220 includes a base plate 110, a center frame 120, and side frames .

[0042] The base plates 110 are made up of a pair, and the center frame 120 is interposed between the pair of base plates 110 and connected to both sides of each base plate 110 in the longitudinal direction L. The pair of side frames 130 are connected to the outer surfaces of the base plates 110 in the longitudinal direction L, respectively.

[0043] Here, the fact that the base plates 110 consist of a pair means that the base plates 110 are connected to both sides of the center frame 120, and each base plate 110 may be made up of several plates joined together, and it does not necessarily mean that the base plates 110 on both sides are symmetrical with respect to the center frame 120.

[0044] The center frame 120 has an inverted T shape so as to form partition walls for the base plates 110 on both sides, while also forming a coupling surface for each base plate 110. Referring to FIG. 1 , a plurality of battery modules 200, four battery modules 200 in each side in the embodiment shown in the drawings as an example, are mounted in the pack spaces on both sides divided by the vertical partition walls of the center frame 120.

[0045] In the first embodiment of the present invention, the center frame 120 and the side frame 130 are connected or joined to the pair of base plates 110 by friction stir welding. Friction stir welding minimizes weld beads, resulting in flat connecting surfaces between the base plates 110, the center frame 120, and the side frames 130. If necessary, the weld beads can be completely removed by cutting, such as milling.

[0046] A plurality of battery modules 200 are provided and mounted on the base plate 110 along the pack space between the center frame 120 and the side frame 130. FIG. 3 is a diagram illustrating the battery modules 200, and as shown in the drawing, each battery module 200 includes a pair of module frames 210 that accommodate a plurality of battery cells 220.

[0047] The pair of module frames 210 are disposed on both ends of the plurality of battery cells 220 aligned in a row along the thickness direction of the battery cells 220 (i.e., the longitudinal direction of the pack case). The module frames 210 are fixed to the side frames 130 of the pack case 100 while accommodating the plurality of battery cells 220, and each battery module 200 is accommodated in the pack space such that the module frames 210 are disposed in a direction crossing the center frame 120 and the side frames 130, i.e., in the width direction W.

[0048] In the illustrated embodiment, bus bar assemblies BA for electrically connecting the plurality of battery cells 220 are provided at both ends in the width direction of the battery module 200. The bus bar assemblies BA connect the plurality of battery cells 220 constituting the battery module 200 in series, parallel, or series-parallel, and the plurality of battery modules 200 are electrically connected to each other via the bus bar assemblies BA.

[0049] 1, the multiple battery modules 200 mounted in the pack space are densely arranged without any gaps between them, so that the module frames 210 of adjacent battery modules 200 are in contact with each other. The module frames 210 are sandwiched between the center frame 120 and the side frames 130 along the width direction W. In other words, the module frames 210, together with the center frame 120 and the side frames 130, form a lattice frame structure in the pack case 100.

[0050] In the pack case 100 of the present invention, the center frame 120 and the side frames 130 bear the load acting in the longitudinal direction L, and no separate support structure is provided for the load acting in the width direction W. Instead, the module frame 210 constituting the battery module 200 bears the load in the direction crossing the center frame 120 and the side frames 130, i.e., in the width direction W.

[0051] That is, in the battery pack 10 of the present invention, the pack case 100 itself does not have a frame structure that bears the load in the width direction W, but the module frame 210 completes a lattice frame structure by mounting a plurality of battery modules 200 in the pack space, thereby increasing the rigidity of the battery pack 100 in both the longitudinal direction L and the width direction W.

[0052] As such, in the battery pack 10 of the present invention, the pack case 100 does not have a separate cross beam, and the module frame 210 included in the battery module 200 serves as the cross beam. Therefore, there are no weld beads that are generated when the cross beam structure is joined to the pack case 100, and as the dead space that was not utilized due to the weld beads is eliminated, more battery cells 220 can be densely arranged in the same pack space, thereby improving the space utilization rate inside the pack.

[0053] In addition, the structure of the module and pack is simplified to the extent that it is no longer necessary to configure a cross beam in the pack case 100, and the process and time required to configure the cross beam are saved, thereby reducing the cost required to manufacture the battery pack 10.

[0054] In the present invention, the basic size of the pack case 100 is determined by the pair of base plates 110 and center frames 120. For example, while maintaining the same specifications of the center frames 120 and side frames 130, it is possible to mount battery cells 220 of different widths simply by varying the width of the base plate 110. Therefore, the battery pack 10 of the present invention can be easily modified or expanded to various specifications while maintaining the basic platform.

[0055] 2, a front frame 140 and a rear frame 150 may be coupled to the front and rear of the pack case 100, respectively. The front frame 140 and the rear frame 150 protect the battery modules 200 on the outer periphery of the pack space while suppressing twisting of the pack case 100. Although the front frame 140 and the rear frame 150 also partially support the load in the width direction W, the role of the cross beam of the pack case 100 is mainly played by the module frame 210 of the battery modules 200.

[0056] 1 and 2, similar to the internal structure of the center frame 120 described above, lattice-like ribs 132, 142, 152 are formed inside the front frame 140 and rear frame 150 as well as the side frame 130, and the overall shape is L-shaped. As a result, the ribs 132, 142, 152 provided inside each frame 130, 140, 150 and the L-shaped bent structure ensure sufficient mechanical strength despite being lightweight.

[0057] Another feature is that in the illustrated embodiment, the side frames 130, front frame 140, and rear frame 150 all have the same shape. This is because the frames 130, 140, and 150 can be manufactured by producing a long frame base material using a continuous extrusion method and then cutting it to the designed dimensions. This reduces the manufacturing cost of the pack case 100 of the present invention and also allows for flexible response at minimal cost even if the size specifications of the pack case 100 are changed.

[0058] The battery module 200 is fixed to the pack case 100 by a module frame 210. As shown in Fig. 6, the module frame 210 is fixed to the side frame 130 of the pack case 100 with a plurality of battery cells 220 housed therein (indicated by a fixing point P), and the module frame 210 can be fixed to the side frame 130, for example, as a bolting structure that connects the module frame 210 to the opposing surface of the side frame 130 via a side surface of the side frame 130.

[0059] Furthermore, the battery pack 10 of the present invention may further include an additional fixing structure for fixing the module frame 210 to the side frame 130 and for more firmly supporting the battery module 200. For reference, the additional fixing structures described below can be combined in various ways.

[0060] 4 and 5 are diagrams illustrating a fixing structure between adjacent battery modules 200. Fig. 4 illustrates a case where battery modules 200, whose pack space is divided by a center frame 120, are fixed to each other using a fixing plate 240. Fig. 5 illustrates a case where adjacent battery modules 200 are fixed to each other by the fixing plate 240, with module frames 210 abutting each other in one pack space.

[0061] That is, battery modules 200 adjacent in the width direction W or the length direction L may be fixed to each other by connecting the module frames 210 to each other, and since a plurality of battery modules 200 are connected together as one module, the fixing of the battery modules 200 is more firmly achieved. In addition, since the module frames 210 of the adjacent battery modules 200 are bound together, the rigidity of the pack case 100 in the width direction W is also strengthened.

[0062] Furthermore, the module frame 210 may also be fixed to the base plate 110. FIG. 7 shows a structure in which the bottom surface of the module frame 210 is fixed to the base plate 110 by a fixing point P, and fixing the module frame 210 to the base plate 110 also improves the bonding strength between the battery module 200 and the pack case 100. For reference, FIG. 7 shows the bottom surface of the pack case 100 without the base plate 110, and it should be noted that the fixing point P simply indicates a fastening point and does not limit the fastening structure itself.

[0063] Meanwhile, the battery module 200 accommodates a plurality of battery cells 220 between module frames 210, but does not have a separate fastening structure between the module frames 210 and the battery cells 220, thereby greatly simplifying the structure of the battery module 200. When the battery module 200 is installed in the pack case 100, the plurality of battery cells 220 are sandwiched between the module frames 210 and fixed with double-sided tape or the like, but the battery cells 220 are not completely fixed before being installed in the pack case 100.

[0064] 3, a temporary battery module 200' may be formed by coupling a pair of pre-assembly plates 230 to the upper surfaces of a pair of module frames 210 as a temporary structure of the transportable battery module 200 before assembly in the pack space. The plurality of battery cells 220 may be transported for stable assembly of the battery pack 10 while surrounded by the module frames 210 and the pre-assembly plates 230, and may be conveniently handled in the form of the temporary battery module 200' during long-distance transportation, for example. However, the temporary battery module 200' refers to a battery module 200 in a pre-assembled state for ease of handling, and the pre-assembly plates 230 do not necessarily have to be used.

[0065] (Second embodiment) 8 and 9 are drawings illustrating a second embodiment of the present invention. Referring to the accompanying drawings, in the second embodiment of the present invention, a base plate 110 is provided with a plurality of cooling channels 112 extending along a longitudinal direction L therein.

[0066] In the battery pack 10 of the present invention, frame components such as the base plate 110, the center frame 120, and the side frames 130 can be manufactured by extrusion molding because their cross sections can be designed to have a uniform shape. Therefore, the base plate 110 can be manufactured by extruding a material such as an aluminum alloy, and the cooling channels 112 can be formed integrally with the base plate 110 during this extrusion molding process.

[0067] By integrally providing a plurality of cooling channels 112 inside the base plate 110, it is not necessary to install a separate cooling pad, which simplifies the structure of the battery pack 10 and also helps reduce weight and costs.

[0068] 8, a cooling channel 112 is integrally formed in the base plate 110, and a hollow portion 119 is formed adjacent to the cooling channel 112. The hollow portion 119 serves to reduce the weight of the base plate 110 and also serves as a passage for discharging heat accumulated in the base plate 110. That is, heat inside the base plate 110 is discharged through the space of the hollow portion 119, thereby lowering the temperature of the base plate 110. As the temperature of the base plate 110 decreases, heat generated in the battery module 200 can be more smoothly absorbed.

[0069] The cooling channel 112 may have an inlet channel 113 at one end in the longitudinal direction L of the base plate 110, and an outlet channel 114 at the other end in the longitudinal direction L. That is, the cooling channel 112 may form a straight flow path, and in particular, when the base plate 110 is formed by extrusion molding, the cooling channel 112 forms a straight flow path.

[0070] A cooling medium, for example, cooling water, flows into the inlet channel 113 to absorb heat, and then flows out through the outlet channel 114, and an inlet joint 115 and an outlet joint 117 may be connected to the inlet channel 113 and the outlet channel 114, respectively, for supplying and discharging the cooling water.

[0071] 8 illustrates an enlarged view of the inlet joint 115. In one example, the inlet joint 115 may have a structure in which a plurality of corrugated tubes are connected in series by communicating with each other via a coupler 115-1. The coupler 115-1 of the inlet joint 115 may be a quick coupler, i.e., a structure in which connection can be achieved simply by inserting the coupler 115-1 into the inlet channel 113 without using any tools. For example, as illustrated in FIG. 8, the inlet joint 115 may have a quick coupler in which connection can be achieved simply by fitting hooks 115-2, which are wedge-shaped connecting means provided on the coupler 115-1, into grooves provided on the left and right sides of the inlet channel 113. The tip of the coupler 115-1 fitted into the inlet channel 113 has a shape corresponding to the end face of the inlet channel 113, and a sealing means such as an O-ring 115-3 provided at the tip of the coupler 115-1 seals the inlet channel 113, thereby preventing leakage of cooling water. Here, it is clear that the outlet joint 117 can be configured in the same way as the inlet joint 115, as also shown in Figure 9.

[0072] In the illustrated second embodiment, the inlet joint 115 and the outlet joint 117 each include one cooling water inlet 116 and one cooling water outlet 118, and are connected in parallel to the multiple inlet channels 113 and outlet channels 114. That is, the cooling water flowing into the single cooling water inlet 116 starts from the inlet channel 113 closest to the cooling water inlet 116 and flows sequentially into the multiple inlet channels 113. Similarly, the cooling water flowing out of the multiple outlet channels 114 joins together as a single flow and is discharged via the single cooling water outlet 118.

[0073] According to this embodiment, the more the number of coolant inlets 116 and coolant outlets 118 is minimized, the easier it is to configure a coolant circuit for multiple battery packs 10.

[0074] The inlet joint 115 and the outlet joint 117, which are connected in parallel to the plurality of inlet channels 113 and the plurality of outlet channels 114, may have a corrugated tube between the inlet joint 115 and the outlet joint 117. The inlet joint 115 and the outlet joint 117, which are provided with the corrugated tube and ensure flexibility, facilitate the connection work to the plurality of inlet channels 113 and the outlet channels 114, and also absorb vibrations caused by the flow of coolant and external vibrations transmitted from the battery pack, thereby preventing accidents such as loosening of the inlet joint 115 and the outlet joint 117.

[0075] The present invention has been described in more detail above with reference to the drawings and embodiments, etc. However, the configurations described in the drawings or embodiments in this specification are merely one embodiment of the present invention and do not represent all of the technical ideas of the present invention, so it should be understood that there may be various equivalents and modifications that can replace them at the time of filing this application. [Explanation of symbols]

[0076] 10: Battery pack 100: Pack case 110: Base plate 112: Cooling channel 113: Entrance channel 114: Exit channel 115: Inlet joint 115-1: Coupler 115-2: Hook 115-3: O-ring 116: Cooling water inlet 117:Outlet joint 118: Cooling water outlet 120: Center frame 130: Side frame 140: Front frame 150: Rear frame 132, 142, 152: Ribs 200: Battery module 210: Module frame 220: Battery cell 230: Temporary assembly plate 240:Fixed plate BA: Busbar assembly P: Fixed point

Claims

1. A pair of base plates; a center frame interposed between the pair of base plates and connected to each base plate on both sides in a longitudinal direction; a pair of side frames respectively connected to outer surfaces of the base plate in a longitudinal direction; a plurality of battery modules mounted on a base plate along a pack space between the center frame and the side frames; Including, the battery module includes a pair of module frames that accommodate a plurality of battery cells, and the module frames are accommodated in the pack space so as to be disposed in a direction crossing the center frame and the side frames; the module frame supports a load in a direction transverse to the center frame and the side frames, The battery pack The battery pack further includes a fixing plate (240) for fixing one battery module (200) and another battery module (200) to each other, the pack spaces of which are divided by the center frame (120), The fixing plate (240) The module frame (210) of one battery module (200) and the module frame (210) of the other battery module (200), whose pack spaces are divided by the center frame (120), are fixed to each other, The battery pack includes a center frame (120) between the one battery module (200) and the other battery module (200) whose pack space is divided from each other and fixed to each other.

2. The pair of module frames include: The battery pack according to claim 1 , wherein the first and second electrodes are disposed on both ends of the plurality of battery cells aligned in a line along a thickness direction of the battery cells.

3. The module frame includes: The battery pack according to claim 2 , wherein the battery pack is fixed to the side frame in a state in which the plurality of battery cells are housed therein.

4. The module frame includes: The battery pack according to claim 3 , wherein the battery pack is fixed to other module frames adjacent to each other along the longitudinal direction.

5. The module frame includes: The battery pack of claim 4 , wherein the battery pack is fixed to the base plate.

6. The battery pack according to claim 1 , wherein the center frame and the side frames are connected to the pair of base plates by friction stir welding.

7. a front frame and a rear frame that are coupled to the pair of side frames to surround an outer periphery of the pack space, The battery pack of claim 1 , wherein the side frames, the front frame, and the rear frame have the same shape.

8. The battery pack according to claim 1 , wherein the base plate includes a plurality of cooling channels extending longitudinally therethrough.

9. The cooling channel The battery pack of claim 8 , wherein the battery pack is integrally formed with the base plate.

10. The cooling channel 9. The battery pack of claim 8, wherein one longitudinal end of the base plate forms an inlet channel, while the other longitudinal end of the base plate forms an outlet channel.

11. The battery pack of claim 10 , wherein the inlet and outlet channels are coupled with an inlet joint and an outlet joint, respectively.

12. 12. The battery pack of claim 11, wherein the inlet joint and the outlet joint each include one coolant inlet and one coolant outlet, and are coupled in parallel to a plurality of the inlet channels and the outlet channels.

13. 12. The battery pack of claim 11, wherein the inlet joint and outlet joint are coupled to the inlet channel and outlet channel, respectively, by quick couplers.

Images