Battery pack case, battery pack including the same, and vehicle

Abstract

A battery pack case, a battery pack including the same, and a vehicle are disclosed, each including a base plate which constitutes one surface of the battery pack case and has a through hole formed therein that connects the internal space of the battery pack case to the outside, and an external plate which is positioned away from the outer surface of the base plate, blocks the through hole from being exposed to the outside, and forms a separation space between itself and the base plate.

Description

Technical Field

[0001] The present invention relates to a battery pack case that can effectively discharge the leaked cooling medium to prevent a short circuit of battery cells when a cooling mechanism is installed inside the battery pack case, a battery pack including the same, and a vehicle.

Background Art

[0002] In recent years, in order to solve environmental problems such as abnormal temperatures, technologies for carbon reduction have been actively developed. In order to reduce carbon, it is necessary to produce energy in a nature-friendly way rather than from fossil fuels, store the produced energy in the form of electrical energy, and use this stored electrical energy in vehicles, various industrial sites, and households.

[0003] In order to utilize electrical energy for carbon reduction, it is essential to use a battery that can store and导出 electrical energy. Therefore, in order to sufficiently store electrical energy and use it without inconvenience, it is essential to ensure the performance of the battery.

[0004] Batteries mainly use the oxidation-reduction reaction of metal ions. In order to increase the capacity, charge-discharge performance, and efficiency of the battery, metal ions are used at high density, and much research has been conducted on substances constituting electrolytes and solid electrolytes. However, generally, there is a problem that the safety of the battery decreases as the performance of the battery develops.

[0005] In the case of batteries used in vehicles, industries, households, etc., they are manufactured in a physical unit called a pack. The battery pack achieves the function of preventing the transfer of fire to the outside even in the event of an accident such as thermal runaway of the battery by enclosing and sealing a large number of battery cells inside the battery case, and protecting the internal battery cells from deteriorating due to the influence of the external environment or being damaged due to physical reasons. It should be noted that the Chinese character "导出" in the original text seems incorrect. It might be "导出" which is not a standard Chinese word in this context. If it is supposed to be "导出" (export in English), the translation should be adjusted accordingly. But based on the given text, this is the translation following the rules.

[0006] A battery pack contains numerous battery cells in an intermediate form between modules and cell modules (CMAs, or cell module assemblies). In the case of battery modules or cell assemblies, numerous battery cells are assembled into a single module or assembly, and the battery pack is completed by fastening these modules together inside the pack case. Maintenance is facilitated by allowing maintenance to be performed on these module or assembly units.

[0007] The numerous unit battery cells that make up a module or assembly consist of a positive electrode, a negative electrode, and an electrolyte. Since battery cells generate heat during charging and discharging, effective heat dissipation is necessary. Furthermore, from the perspective of battery modules, assemblies, or battery packs, efficient heat dissipation design is essential to prevent safety accidents.

[0008] On the other hand, batteries can deteriorate due to manufacturing errors, excessive charging and discharging, and aging. If battery deterioration persists, it can eventually lead to a fire. Therefore, it is necessary to take precautions to prevent battery fires. To this end, it is important to continuously sense the battery's condition, recognize and respond to any problems in advance, and minimize damage when unexpected problems occur.

[0009] In particular, when a cooling mechanism for cooling battery cells is installed inside the battery pack case, cooling hoses and other components are built into the battery pack case. When a fire occurs in such a system, the high heat can damage the cooling hoses and other components, potentially causing a leak of the cooling medium inside the battery pack case.

[0010] Since leaked cooling fluid can be a conductive fluid, there was a possibility of short circuits occurring in battery cells or terminals. Therefore, when the cooling mechanism is installed inside the battery pack case, a technology is needed to effectively and quickly discharge the cooling fluid to the outside in order to prevent short circuits in the event of such an accident.

[0011] The matters described above as background technology are merely for the purpose of enhancing understanding of the background of the present invention and should not be accepted as acknowledging that they correspond to prior art already known to those with ordinary skill in the art. [Overview of the project] [Problems that the invention aims to solve]

[0012] The present invention was proposed to solve these problems, and aims to provide a battery pack case, a battery pack including the same, and a vehicle that can effectively discharge leaked cooling medium and prevent short circuits of battery cells when a cooling mechanism is installed inside the battery pack case.

[0013] The technical problems that this invention aims to solve are not limited to those mentioned above, and other technical problems not mentioned will be clearly understandable to a person with ordinary skill in the art to which this invention belongs from the following description. [Means for solving the problem]

[0014] A battery pack case according to the present invention for achieving the above objective includes a base plate that constitutes one surface of the battery pack case and has a through hole formed therein that connects the internal space of the battery pack case with the outside, and an external plate that is disposed at a distance from the outer surface of the base plate, blocks the through hole from being exposed to the outside, and forms a separation space between itself and the base plate.

[0015] The base plate constitutes the bottom surface of the battery pack case, and a battery assembly can be mounted on the upper surface of the base plate.

[0016] The through-holes in the base plate may be formed at points between the multiple battery assemblies housed in the battery pack case.

[0017] The through-holes in the base plate may be formed at positions corresponding to the cooling mechanism built into the battery pack case.

[0018] The cooling mechanism may include at least one of the following: a cooling hose or a cooling port.

[0019] A cooling channel is provided between the battery assembly housed in the battery pack case and the base plate, and the through-hole in the base plate may be formed at a position corresponding to at least one of the cooling ports of the cooling channel or a cooling hose connected to the cooling port.

[0020] The cooling channel is coupled to one surface of the battery assembly, the cooling port protrudes from the cooling channel to the outside of the battery assembly, the cooling hose is connected to the cooling port, and the through hole in the base plate may be formed at a location corresponding to the cooling port.

[0021] The through-hole in the base plate is formed below the cooling port of the cooling mechanism built into the battery pack case or the cooling hose connected to the cooling port, allowing the cooling medium flowing out from the cooling port or the cooling hose to flow into the through-hole by its own weight.

[0022] The base plate may be thicker than the outer plate.

[0023] The base plate may contain aluminum.

[0024] The external plate may include steel.

[0025] By installing a filtering mechanism in the through-hole of the base plate, foreign matter can be blocked from flowing into the separation space.

[0026] On the inner peripheral surface of the through-hole, a flange projects inwardly of the through-hole, and the filtering mechanism can be coupled to the flange.

[0027] On the flange, a plurality of support portions project toward the filtering mechanism, and the filtering mechanism can be seated on the support portions so that the filtering mechanism and the flange can be separated.

[0028] The filtering mechanism can be installed on the flange by being fixed to the support portions.

[0029] The filtering mechanism has a plate shape, is seated inside the through-hole, the outer peripheral surface of the filtering mechanism is separated from the inner peripheral surface of the through-hole, and the internal space of the battery pack case and the separation space can communicate with each other through a separation gap.

[0030] The filtering mechanism has a plate shape, is seated inside the through-hole, and the upper surface of the filtering mechanism and the base plate may be in the same plane.

[0031] A side wall is formed along the periphery of the external plate, and the side wall can be coupled to the base plate to form the separation space.

[0032] At a point on the external plate corresponding to the through-hole of the base plate, a projection may project toward the through-hole.

[0033] The external plate is formed such that it tilts outward from the point corresponding to the through-hole, thereby increasing the height of the separation space outward from the point corresponding to the through-hole.

[0034] The external plate is provided with a sealing portion along its perimeter and can be coupled to the base plate with the sealing portion in between. [Effects of the Invention]

[0035] According to the battery pack case of the present invention, and the battery pack and vehicle including the same, when a cooling mechanism is installed inside the battery pack case, when a cooling medium leaks, the leaked cooling medium can be effectively discharged to prevent a short circuit of the battery cells.

[0036] The effects obtained by the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understandable to a person with ordinary skill in the art to which the present invention belongs from the following description. [Brief explanation of the drawing]

[0037] [Figure 1] This is a cross-sectional view of a battery pack case according to one embodiment of the present invention. [Figure 2] Figure 1 shows the battery pack case viewed from above. [Figure 3] This figure shows the through-holes in the battery pack case shown in Figure 1. [Figure 4] This figure shows the battery pack case with the filtering mechanism installed. [Figure 5] Figure 1 is a cross-sectional view of the through-hole location in the battery pack case. [Figure 6] Figure 1 shows the battery pack case viewed from below. [Figure 7] This is a cross-sectional view showing the outer plate of the battery pack case shown in Figure 1. [Figure 8]This figure shows a battery pack and vehicle to which the battery pack case shown in Figure 1 is applied. [Modes for carrying out the invention]

[0038] In describing the embodiments disclosed herein, if it is determined that a specific description of related known technology may obscure the essence of the embodiments disclosed herein, such detailed description will be omitted. Furthermore, the accompanying drawings are merely for the purpose of facilitating the understanding of the embodiments disclosed herein, and should not be understood as limiting the technical ideas disclosed herein, but rather as including all modifications, equivalents, or substitutions that fall within the concept and technical scope of the present invention.

[0039] Terms including ordinal numbers such as "first," "second," etc., can be used to describe a variety of components, but the components are not limited by such terms. These terms are used solely for the purpose of distinguishing one component from another.

[0040] A singular expression includes plural expressions unless explicitly indicated otherwise in the context.

[0041] In this specification, terms such as “includes” or “have” are intended to indicate the presence of features, figures, stages, operations, components, parts, or combinations thereof as described in the specification, and should be understood not to preemptively exclude the possibility of the presence or addition of one or more other features, figures, stages, operations, components, parts, or combinations thereof.

[0042] The suffixes "module" and "part" used with respect to components in the following description are added or used interchangeably solely for the sake of ease of specification preparation and do not inherently possess a distinct meaning or role from one another. When a component is referred to as being "linked" or "connected" to another component, it should be understood that it may be directly linked or connected to the other component, or that other components may be present in between. On the other hand, when a component is referred to as being "directly linked" or "directly connected" to another component, it should be understood that there are no other components present in between.

[0043] Hereinafter, embodiments disclosed herein will be described in detail with reference to the attached drawings, and identical or similar components will be given the same reference numeral regardless of the reference numerals in the drawings, and redundant explanations therefor will be omitted. The battery pack case of the present invention will be described with reference to Figures 1 and 2. The battery pack case C according to the present invention includes a base plate 100 which constitutes one surface of the battery pack case C and has a through hole 120 formed therein that connects the internal space of the battery pack case C to the outside, and an external plate 300 which is disposed at a distance from the outer surface of the base plate 100, blocks the through hole 120 from being exposed to the outside, and forms a separation space 110 between the base plate 100 and the external plate 300.

[0044] The battery pack case C contains multiple battery assemblies M. In this invention, a battery assembly M refers to a single unit assembly composed of multiple battery cells. The battery assembly M encompasses all concepts, including battery modules that configure battery cells into a single unit via a single case, and battery assemblies configured in an unassembled state. It also includes CTP (CELL TO PACK) type battery assemblies in which battery cells are assembled and directly fastened inside the battery pack case C. In other words, the battery assemblies M of this invention are those in which battery cells are assembled and mounted inside the battery pack case C, and the concept encompasses various forms of unit assemblies.

[0045] The battery cells installed inside the battery pack case C require cooling. Since battery cells generate heat during charging and discharging, cooling significantly affects the performance and durability of the battery cells. In one embodiment of the present invention, a method is presented in which cooling mechanisms 500, 520, and 540 are installed inside the battery pack case C, and the battery cells are cooled directly through the cooling mechanisms.

[0046] Examples of the cooling mechanisms 500, 520, and 540 include the configuration in which a cooling channel 500 is installed at the bottom of the battery assembly M, as shown in the figure. A cooling medium circulates inside the cooling channel 500 to directly cool the battery assembly M by heat conduction. When such a direct heat conduction type cooling channel 500 is used, the cooling efficiency is increased.

[0047] However, in order to use the cooling channel 500, a cooling hose 540 must be installed inside the battery pack case C. The cooling hose 540 is there for the inflow and outflow of the cooling medium, and by circulating the cooling medium through the cooling hose 540, the cooling medium in the cooling channel 500 circulates and cools the battery cells.

[0048] The cooling hose 540 is connected to the cooling channel 500 via the cooling port 520. On the other hand, the present invention can also be applied when the cooling mechanism is configured with various configurations other than the cooling channel 500, cooling hose 540, and cooling port 520.

[0049] In the case of cooling channels 500, cooling hoses 540, cooling ports 520, etc., the connections may be incomplete or the sealing may weaken over time. Also, if a fire occurs inside the battery pack case C, the durability may weaken and melt, causing the internal cooling medium to leak.

[0050] If the cooling medium leaks from inside the battery pack case C, the electrical insulation between multiple battery cells and terminals may be destroyed, potentially causing problems such as short circuits. Therefore, when mounting the cooling mechanism directly inside the battery pack case C, it is important not only to prevent the cooling medium from leaking, but also to quickly discharge any leaked cooling medium to the outside.

[0051] For this purpose, in the present invention, a through-hole 120 is formed in the base plate 100. The base plate 100 constitutes one surface of the battery pack case C, and a through-hole 120 is formed therein that connects the internal space of the battery pack case C to the outside. In the illustrated embodiment, the base plate 100 constitutes the bottom surface of the battery pack case C. However, the base plate 100 does not necessarily have to be the bottom surface, and can be any surface in various directions of the battery pack case C in which the battery assembly M is installed.

[0052] The base plate 100 constitutes the bottom surface of the battery pack case C, and a battery assembly M can be mounted on the top surface of the base plate 100. A cooling channel 500 is provided between the battery assembly M, which is built into the battery pack case C, and the base plate 100, thereby directly cooling the battery assembly M through the cooling channel 500. The cooling mechanism includes the cooling channel 500 and cooling ports 520 provided in the cooling channel 500, and also includes a cooling hose 540 connected to the cooling ports 520.

[0053] A through-hole 120 is formed in the base plate 100, and the cooling medium that flows out from the cooling mechanism is discharged to the outside of the battery pack case C through the through-hole 120 in the base plate 100. Because the through-hole 120 is formed in the base plate 100, which is the bottom surface of the battery pack case C, the flowing cooling medium flows into the through-hole 120 by its own weight and is naturally discharged to the outside through the through-hole 120.

[0054] In particular, the through-hole 120 may be formed at a location corresponding to at least one of the cooling ports 520 of the cooling channel 500 or the cooling hose 540 connected to the cooling port 520. That is, as shown in Figure 2, the through-hole 120 of the base plate 100 may be formed at a point between multiple battery assemblies M built into the battery pack case C. Alternatively, the through-hole 120 of the base plate 100 may be formed at a location corresponding to a cooling mechanism built into the battery pack case C.

[0055] A cooling channel 500 is located at the bottom of the battery assembly M. A cooling port 520 is formed at a point exposed on the side of the battery assembly M to supply a cooling medium to the cooling channel 500. Therefore, the cooling port 520 does not interfere with the battery assembly M and can be effectively connected to the cooling hose 540.

[0056] Since cooling medium leaks often occur in the cooling hose 540 or cooling port 520 during a fire, it is preferable that the through-hole 120 be formed at a point corresponding to the lower part of the cooling hose 540 and cooling port 520. This ensures that if a fire occurs inside the battery pack case C or a leak occurs at the connection point between the cooling hose 540 and the cooling port 520, the cooling medium will leak downward due to its own weight and be immediately discharged to the outside through the lower through-hole 120. Therefore, the possibility of contact between the leaked cooling medium and the battery cells or terminals is significantly reduced.

[0057] Specifically, as shown in Figures 1 and 2, the cooling channel 500 is connected to one side of the battery assembly M, the cooling port 520 protrudes from the cooling channel 500 to the outside of the battery assembly M, a cooling hose 540 is connected to the cooling port 520, and the through hole 120 in the base plate 100 may be formed at a point corresponding to the cooling port 520. Furthermore, the through hole 120 in the base plate 100 is formed below the cooling port 520 of the cooling mechanism built into the battery pack case C or the cooling hose 540 connected to the cooling port 520, and the cooling medium that flows out of the cooling port 520 or cooling hose 540 can flow into the through hole 120 by its own weight.

[0058] On the other hand, the outer plate 300 is positioned at a distance from the outer surface of the base plate 100, blocking the through-hole 120 from being exposed to the outside and forming a separation space 110 between it and the base plate 100. The through-hole 120 can only prevent foreign matter from flowing back into the battery pack case C by blocking its connection to the outside. In addition, the lower part of the base plate 100 needs to be shielded by the outer plate 300 to prevent other foreign matter or flames from flowing out to the outside as the leaked cooling medium is discharged to the outside through the through-hole 120.

[0059] For this purpose, the outer plate 300 is positioned at a distance from the outer surface of the base plate 100, shielding the through-hole 120 from being exposed to the outside. Specifically, the outer plate 300 has side walls formed around its perimeter. The outer plate 300 is then coupled to the base plate 100 via the side walls, creating a separation space 110 between the two. The separation space 110 formed between the base plate 100 and the outer plate 300 is normally an empty space and serves to absorb or disperse impacts input from below. Furthermore, if a leak of the cooling medium occurs inside the battery pack case C, the leaked cooling medium is discharged through the through-hole 120 and stored in the separation space 110 formed between the base plate 100 and the outer plate 300, thereby reducing the possibility of the cooling medium, foreign matter, and other flames leaking to the outside. Furthermore, the cooling medium filling the separation space 110 also acts as a firewall or fire extinguishing wall at the bottom of the battery pack case C, thereby preventing the fire from the battery pack from spreading to the outside.

[0060] On the other hand, as shown in Figures 6 and 7, the outer plate 300 may be formed such that a point corresponding to the through hole 120 of the base plate 100 protrudes toward the through hole 120. The illustrated embodiment shows a case where the through hole 120 is formed in the center of the battery pack case C, and the outer plate 300 also shows a case where the corresponding central part protrudes upward.

[0061] Furthermore, the outer plate 300 is formed to tilt outward from a point corresponding to the through-hole 120, thereby allowing the height of the separation space 110 to increase outward from the point corresponding to the through-hole 120. In other words, the outer plate 300 has an inclined surface 320 that gradually decreases in height from the highest protruding central part toward the side, so that the cooling medium discharged through the through-hole is naturally guided along the inclined surface 320 to the lateral edge of the battery pack case C.

[0062] Since vehicles are not always located on flat surfaces, setting a slope on the outer plate 300 in this way prevents the flowing cooling medium from accumulating in the center, thus preventing the problem of delayed discharge of the cooling medium at the through-hole 120. Thus, the outer plate 300 is highest at the point corresponding to the through-hole 120 and then gradually decreases in slope, so that the cooling medium does not get delayed at the through-hole 120 and is quickly transported across the entire surface of the separation space 110. In addition, the angled shape of the outer plate 300 makes it more robust against external impacts from below. That is, even if an impact is applied from the outside, the bent shape of the outer plate 300 can absorb the impact.

[0063] In particular, when a battery pack fire occurs, the large amount of gas generated causes the internal pressure of the battery pack case C to become extremely high. In such a case, the through-hole 120 creates a high-pressure environment in the separation space 110 between the base plate 100 and the outer plate 300. In this case, the outer plate 300 is subjected to pressure that causes it to expand outward, but because the outer plate 300 has a bent inclination as shown in the figure, it has a shape that protrudes toward the through-hole 120, thereby giving it a spring-like function that can withstand high internal pressure.

[0064] Furthermore, the outer plate 300 is provided with a sealing portion 342 along its perimeter, and is connected to the base plate 100 by bolts 340, etc., with the sealing portion 342 in between. This prevents the cooling medium and flame from spreading to the outside, prevents foreign matter from flowing back into the battery pack case C, and isolates the internal atmosphere of the battery pack case C from the outside, thus providing advantages in thermal management.

[0065] On the other hand, the base plate 100 may be thicker than the outer plate 300. For example, the base plate 100 may contain aluminum, and the outer plate 300 may contain steel. Forming the base plate 100 from aluminum ensures formability and improves weldability with other surrounding panels and parts. On the other hand, since it contains aluminum, it is preferable to form it to be thicker than the outer plate 300.

[0066] On the other hand, the outer plate 300 may contain highly rigid steel to ensure formability in the central part leading to the through-hole 120. In exchange, its thickness can be reduced compared to the base plate 100. Furthermore, it is preferable to use stainless steel among steels to prevent corrosion. In this way, by varying the material and thickness for each panel, weight can be optimized and strength, safety, and durability can be improved.

[0067] On the other hand, as shown in Figures 3 to 5, a filtering mechanism 700 is provided in the through-hole 120 of the base plate 100, thereby preventing foreign matter from flowing into the separation space. Specifically, a flange 140 is provided projecting inward from the inner circumferential surface of the through-hole 120, and the filtering mechanism 700 can be coupled to the flange 140. Multiple support portions 160 are provided projecting toward the filtering mechanism 700 from the flange 140, and the filtering mechanism 700 can be separated from the flange 140 by seating on the support portions 160.

[0068] This structure allows the cooling medium that has leaked out from the inside to be efficiently discharged through the separated space between the filtering mechanism 700 and the flange 140, while foreign matter other than the cooling medium is blocked by the filtering mechanism 700. By blocking the discharge of foreign matter, the possibility of flame propagation to the outside can be reduced. Furthermore, the size of the foreign matter to be filtered can be adjusted by adjusting the distance between the filtering mechanism 700 and the flange 140.

[0069] The filtering mechanism 700 can be installed on the flange 140 by being fixed to the support portion 160. The filtering mechanism 700 has a plate shape and is seated inside the through hole 120, with the outer surface of the filtering mechanism 700 separated from the inner surface of the through hole 120, allowing the internal space of the battery pack case C and the separation space 110 to communicate through the separation gap.

[0070] Furthermore, the filtering mechanism 700 has a plate shape and is seated inside the through hole 120, and the upper surface of the filtering mechanism 700 and the base plate 100 can be on the same plane. Although various embodiments of the filtering mechanism 700 are possible, the simplest form may be a plate shape with a certain thickness as shown in the figure. By forming the filtering mechanism 700 with a plate rather than a mesh, damage to the filtering mechanism 700 by flames can be prevented. In addition, only the cooling medium can pass through the gap between the filtering mechanism 700 and the flange 140 and support part 160.

[0071] Furthermore, by ensuring that the upper surface of the filtering mechanism 700 and the upper surface of the base plate 100 are on the same plane, damage to and interference of the filtering mechanism 700 by other mechanisms are prevented. Specifically, as shown in the figure, the filtering mechanism 700 is supported by the support portion 160 of the flange 140, and can be fastened to the support portion 160 by bolts 720 or the like.

[0072] On the other hand, Figure 8 shows a battery pack BP to which the battery pack case of the present invention is applied, and the state in which the battery pack is installed in a vehicle V. In addition to vehicles, the battery pack of the present invention can be applied to a variety of industries, one example being an electrical energy storage system (ESS). According to the battery pack case of the present invention, and the battery pack and vehicle including it, when a cooling mechanism is installed inside the battery pack case, in the event of a leak of the cooling medium, the leaked cooling medium can be effectively discharged to prevent a short circuit of the battery cells.

[0073] Although the present invention has been described with reference to specific embodiments, it will be apparent to those with ordinary skill in the art that the present invention can be improved and modified in various ways without departing from the technical spirit of the invention as defined by the following claims. [Explanation of Symbols]

[0074] 100 base plate 110 Separate space 120 Through Holes 140 flange 160 Support part 300 External Plate 320 Slope 340 Bolting 342 Sealing section 500 cooling channels 520 cooling ports 540 Cooling hose 700 Filtering mechanism 720 Bolting BP Battery Pack C Battery Pack Case M Battery Assembly V Vehicle

Claims

1. A base plate that forms one side of the battery pack case and has a through hole formed therein that connects the internal space of the battery pack case to the outside, A battery pack case comprising: an external plate disposed at a distance from the outer surface of the base plate, blocking the through-hole from being exposed to the outside, and forming a separation space between itself and the base plate.

2. The base plate constitutes the bottom surface of the battery pack case, and the battery assembly is mounted on the upper surface of the base plate. The battery pack case according to claim 1, characterized in that the through-holes in the base plate are formed at points between a plurality of battery assemblies built into the battery pack case.

3. The through-hole in the base plate is formed at a position corresponding to the cooling mechanism built into the battery pack case. The battery pack case according to claim 1, characterized in that the cooling mechanism includes at least one of a cooling hose or a cooling port.

4. The battery pack case according to claim 1, wherein a cooling channel is provided between the battery assembly built into the battery pack case and the base plate, and the through-hole in the base plate is formed at a position corresponding to at least one of the cooling ports of the cooling channel or a cooling hose connected to the cooling port.

5. The battery pack case according to claim 4, characterized in that the cooling channel is coupled to one surface of the battery assembly, the cooling port protrudes from the cooling channel to the outside of the battery assembly, the cooling hose is connected to the cooling port, and the through hole of the base plate is formed at a point corresponding to the cooling port.

6. The battery pack case according to claim 1, characterized in that the through-hole of the base plate is formed below the cooling port of a cooling mechanism built into the battery pack case or a cooling hose connected to the cooling port, and the cooling medium flowing out from the cooling port or the cooling hose flows into the through-hole by its own weight.

7. The battery pack case according to claim 1, characterized in that the base plate is thicker than the outer plate, the base plate contains aluminum, and the outer plate contains steel.

8. A filtering mechanism is installed in the through-hole of the base plate to prevent foreign matter from flowing into the separation space. The battery pack case according to claim 1, characterized in that a flange is provided protruding inward from the inner circumferential surface of the through hole, and the filtering mechanism is coupled to the flange.

9. Multiple support portions are provided protruding from the flange toward the filtering mechanism. The battery pack case according to claim 8, characterized in that the filtering mechanism is installed on the flange by being seated on a support portion, thereby separating the filtering mechanism from the flange, or by being fixed to the support portion.

10. The filtering mechanism has a plate shape and is seated inside the through-hole, the outer surface of the filtering mechanism is separated from the inner surface of the through-hole, and the internal space of the battery pack case and the separated space are in communication through the separation gap. The battery pack case according to claim 8, characterized in that the upper surface of the filtering mechanism and the base plate form the same plane.

11. A side wall is formed along the periphery of the outer plate, and is connected to the base plate via the side wall to form the separation space. The battery pack case according to claim 1, characterized in that the external plate has a point corresponding to the through hole of the base plate that protrudes toward the through hole.

12. The battery pack case according to claim 1, characterized in that the external plate is formed to tilt outward from a point corresponding to the through-hole, thereby increasing the height of the separation space outward from a point corresponding to the through-hole.

13. The battery pack case according to claim 1, characterized in that the outer plate is provided with a sealing portion along its periphery and is coupled to the base plate with the sealing portion in between.

14. A battery pack including the battery pack case described in claim 1.

15. A vehicle comprising the battery pack described in claim 14.

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