Pack case having top-cooling and bottom-venting structure

Abstract

A disclosed pack case comprises: a pack bottom plate; multiple side frames surrounding the pack bottom plate; a support plate spaced apart from the pack bottom plate to form a lower venting flow path, and having multiple venting holes formed through a support surface for a battery assembly; and a cooling plate closing the open top surface of an accommodation space divided by the support plate and the multiple side frames, the cooling plate having an inlet and an outlet through which cooling water flows in and out and having a serpentine flow path formed therein to connect the inlet to the outlet. The cooling plate comprises a water injection hole formed on the serpentine flow path, a meltable stopper closing the water injection hole, and a barrier plate extending between the water injection hole and the support plate and having a hollow passage formed therein.

Description

Pack case with top cooling and bottom venting structure

[0001] The present invention relates to a pack case having a structure that cools a battery assembly mounted in a battery pack from the top, and also allows a large amount of dust-laden gas resulting from a thermal event generated within the pack to flow into a lower space and be discharged to the outside.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2024-0162631 filed on November 15, 2024, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0003] Unlike primary batteries, secondary batteries are rechargeable and are currently the subject of extensive research and development due to their potential for miniaturization and high capacity. The demand for secondary batteries as an energy source is increasing rapidly due to the growing technological development and demand for mobile devices, as well as the rise of electric vehicles and energy storage systems driven by the contemporary need for environmental protection.

[0004] Rechargeable batteries are classified into coin batteries, cylindrical batteries, prismatic batteries, and pouch batteries according to the shape of the battery case. In rechargeable batteries, the electrode assembly mounted inside the battery case is a power generation device capable of charging and discharging, consisting of a laminated structure of electrodes and separators.

[0005] Since secondary batteries require continuous use over long periods, it is necessary to effectively control the heat generated during the charging and discharging process. To effectively dissipate the heat generated by secondary batteries, heat sinks (also called cooling plates) through which a refrigerant flows are widely used. Heat sinks are mounted on the bottom surface of a group of multiple secondary batteries, for example, a battery pack containing multiple batteries, and perform a cooling function by absorbing heat generated inside the pack using a refrigerant and releasing it to the outside.

[0006] However, if the amount of heat generated by the secondary battery is excessive and the cooling of the secondary battery is not carried out smoothly, a positive feedback chain reaction occurs in which the temperature rise of the secondary battery causes an increase in current, and the increase in current again causes a temperature rise, eventually leading to a catastrophic state of thermal runaway.

[0007] In addition, when secondary batteries are grouped in the form of modules or packs, a thermal propagation phenomenon occurs in which surrounding secondary batteries are continuously overheated due to thermal runaway occurring in one secondary battery. That is, when thermal runaway occurs in a battery module within a battery pack, a large amount of conductive dust, gas, and flames are ejected from the high-voltage terminal of the battery module, and consequently, dust accumulates on the high-voltage terminal of an adjacent battery module, and the thermal propagation phenomenon is triggered by heat transfer caused by the gas and flames.

[0008] When thermal propagation occurs within a battery pack, the internal pressure and temperature rise rapidly. To withstand this surge in pressure and temperature, the battery pack must maintain structural robustness for a significant period. If the battery pack collapses and external air enters, combustion reactions intensify rapidly, posing a major risk to the exterior of the pack, such as fire or explosion.

[0009] In order to maintain the structure of the battery pack for as long as possible in response to such thermal events, an appropriate venting structure is designed for the battery pack. By discharging high-pressure, high-temperature gas within the pack through the venting channel, the pressure is reduced to prevent structural collapse. However, since the high-temperature gas flowing along the venting channel can adversely affect other battery modules operating normally and cause heat propagation, this issue must be sufficiently considered in the design of the venting channel. As a countermeasure to this problem, a pack case with a bottom venting structure is being developed, designed so that the venting channel, which responds to thermal events occurring in the battery pack, flows into the lower space of the pack case.

[0010] In a battery pack with a bottom venting structure, if a conventional heatsink that cools the battery assembly from the bottom is applied as is, cooling and venting occur simultaneously at the bottom of the battery pack, resulting in a complex structure. Therefore, there is a need to develop a new pack case structure that is suitable for the bottom venting structure and offers improved countermeasures against thermal events.

[0011] The purpose of the present invention is to provide a pack case with an upper cooling and lower venting structure that is resistant to thermal events.

[0012] However, the technical problems that the present invention aims to solve are not limited to those described above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description of the invention below.

[0013] The present invention relates to a pack case, wherein in one embodiment, the pack lower plate, a plurality of side frames surrounding the pack lower plate, a support plate spaced apart from the pack lower plate to form a lower venting channel and having a plurality of venting holes penetrating a support surface for a battery assembly, and a cooling plate that closes the open upper surface of a receiving space partitioned by the support plate and the plurality of side frames, and has an inlet and an outlet for cooling water to flow in and out, and has a meandering channel formed therein connecting the inlet and the outlet, wherein the cooling plate includes a water injection hole formed on the meandering channel and a meltable plug that closes the water injection hole, and a barrier plate that extends between the water injection hole and the support plate and has a hollow passage formed therein.

[0014] It may include an insulating material or an insulating refractory material in contact with the outer surface of the above barrier plate.

[0015] The above barrier plate may be formed with a folded portion having a cross-sectional shape in which one end facing the water supply hole is extended toward the water supply hole.

[0016] The folded portion of the barrier plate can come into contact with the cooling plate.

[0017] The above barrier plate may be made of stainless steel.

[0018] The above-mentioned meltable stopper may be made of polypropylene (PP) resin.

[0019] In one embodiment, the barrier plate may be filled with a superabsorbent polymer (SAP) inside the hollow passage.

[0020] The above superabsorbent polymer may be a flame-retardant material.

[0021] The other end of the barrier plate facing the support plate can be closed by the support plate.

[0022] Meanwhile, the present invention may provide a battery pack comprising a pack case having the above configuration and a plurality of battery assemblies mounted on the support surface of the support plate, wherein the plurality of battery assemblies are in close contact with the cooling plate and the meandering path passes through each battery assembly at least once.

[0023] An insulating material or an insulating refractory material may be interposed between the barrier plate and the battery assembly.

[0024] The battery pack provided by the present invention can prevent the movement of dust-laden gas and flames between the battery assemblies by absorbing external heat as latent heat, while preventing the movement of dust-laden gas and flames between the battery assemblies, by melting the meltable plug due to a thermal event occurring in any of the battery assemblies among the plurality of battery assemblies and supplying cooling water through the water supply hole into the hollow passage of the barrier plate, and by the superabsorbent polymer filled in the hollow passage of the barrier plate absorbing the cooling water and expanding into a gel form.

[0025] The pack case of the present invention having the above-described configuration has an upper cooling and lower venting structure, thereby enabling efficient cooling of the battery assembly and venting in the event of a thermal event with a more simplified structure.

[0026] In particular, the pack case of the present invention can effectively suppress the spread of a thermal event within the pack by supplying cooling water into the hollow passage inside the barrier plate partitioning the battery assemblies when a thermal event occurs, thereby functioning as a thermal capacity that absorbs heat from the battery assemblies and simultaneously acting as a thermal barrier that prevents dust-laden gas and flames from passing between the battery assemblies.

[0027] However, the technical effects obtainable through the present invention are not limited to those described above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description of the invention below.

[0028] The following drawings attached to this specification illustrate preferred embodiments of the present invention and serve to further enhance understanding of the technical concept of the present invention together with the detailed description of the invention provided below; therefore, the present invention should not be interpreted as being limited only to the matters described in such drawings.

[0029] FIG. 1 is a perspective view illustrating an example of a battery pack composed of a pack case according to an embodiment of the present invention.

[0030] FIG. 2 is a cross-sectional view taken along the line "AA" in FIG. 1.

[0031] FIG. 3 is a plan view showing the arrangement of a meandering flow path formed inside a cooling plate.

[0032] FIG. 4 is a cross-sectional view illustrating a configuration in which cooling water is supplied to a barrier plate when a thermal event occurs.

[0033] FIG. 5 is a cross-sectional view of a battery pack composed of a pack case according to another embodiment of the present invention.

[0034] FIG. 6 is a cross-sectional view illustrating the state in which coolant is supplied to the barrier plate when a thermal event occurs in the battery pack of FIG. 5.

[0035] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are to be described in detail below.

[0036] However, this is not intended to limit the invention to specific embodiments, and it should be understood that it includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0037] In the present invention, terms such as "comprising" or "having" are intended to specify the existence of the features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, and should be understood as not excluding in advance the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0038] Furthermore, in the present invention, when a part such as a layer, film, region, or plate is described as being "on" another part, this includes not only cases where it is "immediately above" the other part, but also cases where there is another part in between. Conversely, when a part such as a layer, film, region, or plate is described as being "under" another part, this includes not only cases where it is "immediately below" the other part, but also cases where there is another part in between. Additionally, in the present application, being "placed on" may include cases where it is placed on the lower part as well as on the upper part.

[0039]

[0040] The present invention relates to a pack case, wherein in one embodiment, the pack lower plate, a plurality of side frames surrounding the pack lower plate, a support plate spaced apart from the pack lower plate to form a lower venting channel and having a plurality of venting holes penetrating a support surface for a battery assembly, and a cooling plate that closes the open upper surface of a receiving space partitioned by the support plate and the plurality of side frames, and has an inlet and an outlet for cooling water to flow in and out, and has a meandering channel formed therein connecting the inlet and the outlet, wherein the cooling plate includes a water injection hole formed on the meandering channel and a meltable plug that closes the water injection hole, and a barrier plate that extends between the water injection hole and the support plate and has a hollow passage formed therein.

[0041] The pack case of the present invention having the above-described configuration has an upper cooling and lower venting structure, thereby enabling efficient cooling of the battery assembly and venting in the event of a thermal event with a more simplified structure.

[0042] In particular, the pack case of the present invention can effectively suppress the spread of a thermal event within the pack by allowing cooling water to be supplied into the hollow passage inside the barrier plate that partitions the battery assemblies when a thermal event occurs, thereby functioning as a thermal capacity that absorbs heat from the battery assemblies and acting as a thermal barrier that prevents dust-laden gas and flames from passing between the battery assemblies.

[0043] Hereinafter, specific embodiments of the pack case (10) according to the present invention will be described in detail with reference to the attached drawings. For reference, the directions of front, back, up, down, left, and right used to specify relative positions in the following description are intended to aid in understanding the invention, and unless otherwise specifically defined, the directions shown in the drawings are used as the reference.

[0044]

[0045] [First embodiment]

[0046] FIG. 1 is a perspective view illustrating an example of a battery pack (500) composed of a pack case (10) according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line "AA" of FIG. 1, and FIG. 3 is a plan view showing the arrangement of a meandering flow path (330) formed inside a cooling plate (300). With reference to FIG. 1 to 3, the pack case (10) and battery pack (500) provided by the present invention will be described in detail.

[0047] The illustrated pack case (10) includes a support plate (200) having a plurality of venting holes (210) formed through a support surface that contacts the plurality of battery assemblies (510) and a pack lower plate (100) spaced apart from the support plate (200) to form a lower venting channel (230).

[0048] The support plate (200) has strength capable of supporting the load of multiple battery assemblies (510), which are heavy objects. Additionally, the multiple battery assemblies (510) are aligned with the venting holes (210) of the support plate (200) to implement directional venting. Accordingly, when a thermal event such as thermal runaway occurs in any battery cell (512), high-temperature particles such as venting gas and sparks (hereinafter collectively referred to as "dust-laden gas"), flames, etc., are discharged downward through the venting holes (210) assigned to the battery cell (512). According to an embodiment, each battery assembly (510) may include a lower housing (514) having multiple through holes (516) formed therein. The through holes (516) of the lower housing (514) are aligned to match the venting holes (210) of the support plate (200). Thus, a large amount of dust-laden gas (PG) and flames resulting from a thermal event in a battery cell (512) of the battery assembly (510) are induced to move along a predetermined path leading to the penetration hole (516) and the venting hole (210).

[0049] The pack bottom plate (100) corresponds to a plate-shaped member forming the bottom surface of the pack case (10). The pack bottom plate (100) is spaced downward from the support plate (200) to create a space between them, and this space forms a lower venting channel (230). That is, dust-laden gas (PG), etc. generated from the battery assembly (510) mounted on the support plate (200) flows downward through the venting hole (210), and this dust-laden gas (PG), etc. flows through the space between the pack bottom plate (100) and is finally discharged to the outside of the battery pack (500) via the venting device (520).

[0050] Here, the battery assembly (510) referred to in this specification means a collection of battery cells in which a plurality of battery cells (512) are structurally and electrically connected. Depending on the method of structurally connecting the plurality of battery cells (512), the battery assembly (510) may be referred to by various terms such as battery module, battery block, or battery unit, but the pack case (10) of the present invention is not limited to a specific structure of battery assembly (510). For example, the pack case (10) of the present invention may be a pack case in which a battery module containing a plurality of battery cells is mounted inside a closed housing, or it may be a pack case with a Cell-to-Pack structure in which a plurality of battery cells are bundled into a minimal structure and mounted directly into the pack case without a modular structure containing the plurality of battery cells inside the housing.

[0051] Multiple side frames (220) surround the pack bottom plate (100). Additionally, a support plate (200) is fixed to the multiple side frames (220). Thus, a lower venting structure is created in which the support plate (200) and the pack bottom plate (100) are spaced apart from each other, and a receiving space for a battery assembly (510) is partitioned by the support plate (200) and the multiple side frames (220).

[0052] The open upper surface of the receiving space partitioned by the support plate (200) and the plurality of side frames (220) is closed by a cooling plate (300). The cooling plate (300) is provided with an inlet (310) and an outlet (320) through which cooling water (CW) flows in and out, and a meandering path (330) connecting the inlet (310) and the outlet (320) is formed inside it. As shown in FIG. 3, the meandering path (330) can form a path that passes through each battery assembly (510) at least once.

[0053] The cooling plate (300) includes a water supply hole (340) formed on the meandering channel (330) and a meltable plug (350) that closes each water supply hole (340). For example, the meltable plug (350) may be made of polypropylene (PP) resin. The meltable plug (350) is in a solid state under normal operating conditions of the battery pack (500), but melts due to heat when the temperature inside the pack rises abnormally to a level of several hundred degrees (°C) due to the occurrence of a thermal event. For example, the meltable plug (350) may be made of polypropylene (PP) resin so that the meltable plug (350) can melt at the beginning of the thermal event. When the meltable plug (350) is melted and removed from the cooling plate (300), the cooling water (CW) flowing inside the cooling plate (300) is discharged through the open corresponding water supply hole (340).

[0054] The pack case (10) of the present invention includes a barrier plate (400) that extends between the water supply hole (340) and the support plate (200) and forms a hollow passage (410) inside. The barrier plate (400) serves as a partition to isolate adjacent battery assemblies (510) from each other. Additionally, since one end of the barrier plate (400) is open toward the water supply hole (340), when the meltable plug (350) that was closing the water supply hole (340) is melted and removed, a portion of the cooling water (CW) flowing through the cooling plate (300) is supplied into the hollow passage (410) of the barrier plate (400). Multiple barrier plates (400) may be installed, and multiple water supply holes (340) may be assigned to each barrier plate (400). All water supply holes (340) of the cooling plate (300) are arranged to face one end of the assigned barrier plate (400). For example, as shown in FIG. 3, the water supply holes (340) of the cooling plate (300) can be arranged evenly along the line partitioned by the barrier plate (400).

[0055] FIG. 4 is a cross-sectional view illustrating a configuration in which cooling water (CW) is supplied to a barrier plate (400) when a thermal event occurs. When a thermal event occurs in any of the battery assemblies (510) among the plurality of battery assemblies (510), the meltable plug (350) closest to the corresponding battery assembly (510) begins to melt first, and when the meltable plug (350) is removed and the water supply hole (340) is opened, cooling water (CW) flowing through the cooling plate (300) is discharged through the water supply hole (340). The discharged cooling water (CW) is supplied to the hollow passage (410) of the barrier plate (400) aligned to face the water supply hole (340), and the supplied cooling water (CW) absorbs the heat of the battery assembly (510) that caused the thermal runaway, thereby suppressing or delaying heat propagation.

[0056] The barrier plate (400) may be equipped with the following configuration to enhance the heat propagation suppression function or to facilitate smooth water flow.

[0057] As illustrated in FIGS. 2 and 4, it may include an insulating material or an insulating refractory material (430) in contact with the outer surface of the barrier plate (400). By having the insulating material or the insulating refractory material (430) provided on the outer surface of the barrier plate (400), the barrier plate (400) itself plays a useful role in suppressing heat propagation regardless of whether cooling water (CW) is supplied into the hollow passage (410) of the barrier plate (400).

[0058] Additionally, the barrier plate (400) may be formed with a bent portion (420) having a cross-sectional shape that extends toward the water supply hole (340) at one end facing the water supply hole (340). The bent portion (420) of the barrier plate (400) may come into contact with the cooling plate (300). The bent portion (420) at one end of the barrier plate (400) serves to increase the rigidity of the barrier plate (400). Furthermore, the bent portion (420) having a cross-sectional shape that extends toward the water supply hole (340) increases the allowable range of positional deviation of the barrier plate (400) relative to the water supply hole (340). Additionally, the bent portion (420) of the barrier plate (400) also serves to support the cooling plate (300) by coming into contact with the cooling plate (300). For strong rigidity of the barrier plate (400), the barrier plate (400) can be made of stainless steel.

[0059] The barrier plate (400) can have its other end facing the support plate (200) closed by the support plate (200). By blocking the other end of the barrier plate (400), the coolant (CW) supplied into the hollow passage (410) can continuously absorb the heat generated in the battery assembly (510) that has caused thermal runaway.

[0060] A battery pack (500) is formed by mounting a plurality of battery assemblies (510) on the support surface of the support plate (200) of the pack case (10) having the above configuration. For smooth cooling, the plurality of battery assemblies (510) can be in close contact with the cooling plate (300). Furthermore, the meandering flow path (330) of the cooling plate (300) is configured to pass through each battery assembly (510) at least once, thereby uniformly cooling the battery assemblies (510) and reducing temperature variations.

[0061] Additionally, as described above, an insulating material or an insulating refractory material (430) may be interposed between the barrier plate (400) and the battery assembly (510). By thermally blocking the adjacent battery assembly (510) partitioned by the barrier plate (400) with the insulating material or the insulating refractory material (430), heat conduction due to thermal events can be suppressed.

[0062]

[0063] [Second embodiment]

[0064] FIG. 5 is a cross-sectional view of a battery pack (500) composed of a pack case (10) according to another embodiment of the present invention. In the embodiment shown in FIG. 5, a super absorbent polymer (440) (SAP) is filled into the hollow passage (410) of a barrier plate (400). The super absorbent polymer (440) is porous or fibrous and can absorb a large amount of liquid by exhibiting capillary action, and the thermal capacity of the barrier plate (400) can be stably increased as the super absorbent polymer (440) can hold a large amount of cooling water (CW).

[0065] The specific type of superabsorbent polymer (440) is not particularly limited, and any material with excellent absorption capacity for fluids, especially water, can be used without restriction. However, since it is preferable that the superabsorbent polymer (440) not burn due to thermal events within the battery pack (500), it may be desirable for the superabsorbent polymer (440) to be a flame-retardant material.

[0066] Examples of superabsorbent polymers (440) include polyacrylic acid, polyacrylate, polyacrylate graft polymer, starch, cross-linked carboxymethylated cellulose, acrylic acid copolymer, hydrolyzed starch-acrynitrile graft copolymer, starch-acrylic acid graft copolymer, saponified vinyl acetate-acrylic acid ester copolymer, hydrolyzed acrylonitrile copolymer, hydrolyzed acrylamide copolymer, ethylene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, polyvinylsulfonic acid, polyvinylphosphonic acid, polyvinyl phosphoric acid, polyvinyl sulfate, sulfonated polystyrene, polyvinylamine, polydialkylaminoalkyl(meth)acrylamide, polyethyleneimine, polyallylamine, polyallylguanidine, polydimethyldiallylammonium hydroxide, quaternized polystyrene derivatives, One or more selected from the group consisting of guanidine-modified polystyrene, quaternized poly(meth)acrylamide, polyvinylguanidine and mixtures thereof, preferably one or more selected from the group consisting of cross-linked polyacrylic acid salts, cross-linked polyacrylic acid and cross-linked acrylic acid hollow copolymers, but are not limited thereto.

[0067] And, the type of acrylic acid copolymer used as the superabsorbent polymer (440) is not particularly limited, but preferably it may be a copolymer comprising an acrylic acid monomer and one or more comonomers selected from the group consisting of maleic acid, itaconic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid, 2-(meth)acryloylethanesulfonic acid, 2-hydroxyethyl(meth)acrylate and styrenesulfonic acid.

[0068] In the present invention, the superabsorbent polymer (440) may have an absorption amount of water of 10 g / g to 500 g / g, preferably 50 g / g to 200 g / g, but is not limited thereto. That is, 1 g of superabsorbent polymer (440) can absorb 10 g to 500 g of water, preferably 50 g to 200 g.

[0069] In the present invention, the more the amount of water absorbed by the superabsorbent polymer (440) increases, the longer the duration of the cooling effect can be improved; however, if it exceeds 500 g / g, the fluidity of the superabsorbent polymer (440) increases, making it difficult to maintain its shape and thus unable to provide effective cooling, and if it is less than 10 g / g, the duration of the cooling effect is too short and may be inefficient.

[0070] FIG. 6 is a cross-sectional view illustrating the state in which cooling water (CW) is supplied to the barrier plate (400) when a thermal event occurs in the battery pack (500) of FIG. 5. Due to a thermal event occurring in any of the battery assemblies (510) among the plurality of battery assemblies, the meltable plug (350) blocking the water supply hole (340) is removed, and cooling water (CW) is supplied to the hollow passage (410) of the barrier plate (400), and the superabsorbent polymer (440) filled in the hollow passage (410) of the barrier plate (400) absorbs the cooling water (CW) and expands into a gel form. The superabsorbent polymer (440) expanded into a gel form absorbs external heat as latent heat, while preventing the movement of dust-laden gas (PG) and flame between the battery assemblies (510).

[0071]

[0072] The present invention has been described in more detail above through drawings and embodiments. However, the configurations described in the drawings or embodiments described in this specification are merely one embodiment of the present invention and do not represent all technical concepts of the present invention; therefore, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0073]

[0074] [Explanation of the symbol]

[0075] 10: Pack case

[0076] 100: Pack bottom plate

[0077] 200: Support plate

[0078] 210: Venting Hall

[0079] 220: Side frame

[0080] 230: Lower venting channel

[0081] 300: Cooling plate

[0082] 310: Inlet

[0083] 320: Outlet

[0084] 330: Gambling Euro

[0085] 340: Jusu Hall

[0086] 350: Fusible plug

[0087] 400: Barrier Plate

[0088] 410: Central passage

[0089] 420: Bending part

[0090] 430: Insulation or thermal insulation fireproofing

[0091] 440: Superabsorbent polymer

[0092] 500: Battery pack

[0093] 510: Battery Assembly

[0094] 512: Battery cell

[0095] 514: Lower housing

[0096] 516: Through hole

[0097] 520: Venting device

[0098] CW: Coolant

[0099] PG: Dust-containing gas

Claims

1. Pack bottom plate; A plurality of side frames surrounding the lower plate of the above pack; A support plate spaced apart from the pack lower plate to form a lower venting channel and having a plurality of venting holes penetrating the support surface for the battery assembly; and A cooling plate that closes the open upper surface of a receiving space partitioned by the above-mentioned support plate and a plurality of side frames, and is provided with an inlet and an outlet through which cooling water flows in and out, and has a meandering flow path formed therein connecting the inlet and the outlet; Includes, The cooling plate comprises a water injection hole formed on the meandering channel and a molten plug that closes the water injection hole. A pack case comprising a barrier plate extending between the above-mentioned water supply hole and the above-mentioned support plate, the interior of which forms a hollow passage.

2. In Paragraph 1, A pack case comprising an insulating material or an insulating refractory material in contact with the outer surface of the barrier plate.

3. In Paragraph 1, The above barrier plate is, A pack case formed with a folded portion having a cross-sectional shape that extends toward the water supply hole, with one end facing the water supply hole.

4. In Paragraph 3, A pack case in which the bent portion of the barrier plate contacts the cooling plate.

5. In Paragraph 4, The above barrier plate is a pack case made of stainless steel.

6. In Paragraph 1, The above-mentioned meltable stopper is a pack case made of polypropylene (PP) resin.

7. In Paragraph 1, The above barrier plate is, A pack case filled with a superabsorbent polymer (SAP) inside the above hollow passage.

8. In Paragraph 7, The above superabsorbent polymer is a pack case made of a flame-retardant material.

9. In Paragraph 1, The above barrier plate is, A pack case in which the other end facing the support plate is closed by the support plate.

10. A pack case according to any one of paragraphs 1 through 9; and A plurality of battery assemblies mounted on the support surface of the above-mentioned support plate; Includes, The above plurality of battery assemblies are in close contact with the cooling plate, and A battery pack, wherein the above-mentioned meandering path passes through each battery assembly at least once.

11. In Paragraph 10, A battery pack having an insulating material or an insulating refractory material interposed between the barrier plate and the battery assembly.

12. In Paragraph 10, Due to a thermal event occurring in any of the battery assemblies among the plurality of battery assemblies, the meltable plug is melted and coolant is injected into the hollow passage of the barrier plate through the water injection hole, and A battery pack in which a superabsorbent polymer filled in the hollow passage of the barrier plate absorbs the cooling water and expands into a gel form, thereby absorbing external heat as latent heat while preventing the movement of dust-laden gas and flame between the battery assemblies.

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