Pack case having top cooling and bottom venting structure

Abstract

The disclosed pack case comprises a 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 ventilation flow path and having a plurality of venting holes penetrating the surface supporting a battery assembly, and a cooling plate closing the open upper surface of an accommodation space partitioned by the support plate and the plurality of side frames, the cooling plate having an inlet and an outlet through which coolant flows in and out, and a serpentine flow path formed therein connecting the inlet and the outlet, wherein the cooling plate includes water injection holes provided above the serpentine flow path, fusible plugs for closing the water injection holes, and a plurality of partitions dividing the flow space of the serpentine flow path into at least three or more lanes.

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. 10-2024-0180248 dated December 6, 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 suitable for the bottom venting structure and with 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 supply hole formed on the meandering channel, a meltable plug that closes the water supply hole, and a plurality of partition separators that divide the flow space of the meandering channel into at least three lanes.

[0014] The plurality of partition plates mentioned above may be disposed in the fluid space for a length corresponding to the area occupied by the battery assembly supported on the support plate.

[0015] And, the plurality of partition plates may have a height such that the three or more divided lanes communicate in the upper space of the meandering channel.

[0016] In one embodiment, the plurality of partition plates divide the flow space of the meandering channel into three lanes, and the water injection holes may be arranged in a zigzag shape with an equal number for the three lanes.

[0017] The above water supply hole may be positioned such that the water supply hole of the central lane among the three lanes is located furthest downstream with respect to the direction of cooling water flow.

[0018] In one embodiment, the plurality of partition plates may have a pair of folded openings that form a branching passage leading from the central lane to adjacent lanes.

[0019] The above-mentioned bent opening is bent from the central lane toward the two-sided lanes, and accordingly, the bent opening may form an inclined surface that diverges toward the cooling water flowing in the central lane.

[0020] Based on the water supply hole placed in the central lane, the pair of bent openings can be distributed upstream and downstream in the direction of cooling water flow.

[0021] The flow cross-sectional area of ​​the central lane mentioned above may be larger than the flow cross-sectional area of ​​each of the two lanes mentioned above.

[0022] The above-mentioned meltable stopper may be made of polypropylene (PP) resin.

[0023] 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.

[0024] The battery pack provided by the present invention is such that, due to a thermal event occurring in any of the battery assemblies among the plurality of battery assemblies, the meltable plug is melted and the water supply hole is opened, and the cooling water discharged from the opened water supply hole is supplied to the battery assembly, and the cooling water supplied to the battery assembly flows into the lower venting channel.

[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 the pack case of the present invention, when cooling water flowing through the meandering path of a cooling plate is supplied to a battery assembly through a plurality of water supply holes, the flow space of the meandering path is divided into a plurality of lanes by a plurality of partition separators, and a water supply hole is appropriately allocated to each lane, thereby preventing the problem of insufficient flow rate of cooling water supplied to the downstream water supply hole when the upstream water supply hole is opened. That is, according to the pack case of the present invention, the problem of cooling water discharged from the plurality of water supply holes rapidly becoming insufficient as it moves downstream of the meandering path is prevented.

[0027] In addition, the pack case of the present invention may be provided with a folded opening in the partition separator, through which the cooling water is redistributed from the central lane to both lanes, thereby allowing the cooling water to be discharged more evenly from the downstream water supply hole, and also, by mitigating the pressure drop acting on the downstream water supply hole of the same lane through the folded opening, the effect of flow resistance along the direction of cooling water flow can be reduced.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] FIG. 2 is a cross-sectional view taken along the line "AA" in FIG. 1.

[0032] FIG. 3 is a plan view showing the arrangement of the meandering flow path and water injection holes formed inside the cooling plate.

[0033] FIG. 4 is a cross-sectional view illustrating a configuration in which coolant is supplied to the battery assembly when a thermal event occurs.

[0034] FIG. 5 is an enlarged plan view of section "B" of FIG. 3.

[0035] FIG. 6 is a side view of section "B" of FIG. 3.

[0036] FIG. 7 is a drawing illustrating one embodiment of a partition separator plate forming a branch passage.

[0037] The present invention is capable of various modifications and may have various embodiments, and specific embodiments are to be described in detail below.

[0038] 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.

[0039] 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.

[0040] 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.

[0041]

[0042] 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 supply hole formed on the meandering channel, a meltable plug that closes the water supply hole, and a plurality of partition separators that divide the flow space of the meandering channel into at least three lanes.

[0043] 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.

[0044] In addition, when cooling water flowing through the meandering path of a cooling plate is supplied to a battery assembly through a plurality of water supply holes, the flow space of the meandering path is divided into a plurality of lanes by a plurality of partition separators, and a water supply hole is appropriately allocated to each lane, thereby preventing the problem of insufficient flow of cooling water supplied to the downstream water supply hole when the upstream water supply hole is opened. That is, according to the pack case of the present invention, the problem of cooling water discharged from the plurality of water supply holes rapidly becoming insufficient as it moves downstream of the meandering path is prevented.

[0045] 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.

[0046]

[0047] [First embodiment]

[0048] 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) and a water supply hole (340) formed inside a cooling plate (300). With reference to FIG. 1 to 3, the configuration of the pack case (10) and the battery pack (500) provided by the present invention will be described in detail.

[0049] 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).

[0050] 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).

[0051] 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) of the support plate (200), and this dust-laden gas (PG), etc. flows through the lower venting channel (230) formed between the pack bottom plates (100) and is finally discharged to the outside of the battery pack (500) through the venting device (520).

[0052] 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. 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.

[0053] 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).

[0054] 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.

[0055] Referring to FIG. 2, the cooling plate (300) includes a water supply hole (340) formed on a meandering channel (330) and a meltable plug (350) that closes each water supply hole (340). The meltable plug (350) may be made of, for example, polypropylene (PP) resin. The meltable plug (350) is in a solid state under normal operating conditions of the battery pack (500), but if the temperature inside the pack rises abnormally to a level of several hundred degrees (°C) due to a thermal event, it melts due to heat. In order for the meltable plug (350) to melt at the beginning of the thermal event, the material of the meltable plug (350) needs to be appropriately selected considering the melting point, and in this respect, it may be appropriate for the meltable plug (350) to be made of polypropylene (PP) resin.

[0056] FIG. 4 is a cross-sectional view illustrating a configuration in which coolant (CW) is supplied to the battery assembly (510) when a thermal event occurs. When the meltable plug (350) is melted and removed from the water supply hole (340) due to a rapid temperature rise inside the pack after the thermal event occurs, the coolant (CW) flowing inside the cooling plate (300) is discharged through the open water supply hole (340). The coolant (CW) discharged from the open water supply hole (340) is supplied to the battery assembly (510), and the coolant (CW) supplied to the battery assembly (510) cools the overheated battery assembly (510). Then, the cooling water (CW) that reaches the support plate (200) flows into the lower venting channel (230) through the venting hole (210), and the cooling water (CW) is stored in the lower venting channel (230) or discharged to the outside through the venting device (520).

[0057] As illustrated in FIG. 3, a plurality of water supply holes (340) are arranged on a meandering flow path (330) extending from an inlet (310) to an outlet (320) of the cooling water (CW). In this way, when a plurality of water supply holes (340) are arranged in series with respect to the flow of the cooling water (CW), if the upstream water supply holes (340) are opened and the cooling water (CW) begins to be discharged into the battery assembly (510), the flow rate of the cooling water (CW) decreases as it moves downstream. If a plurality of water supply holes (340) are opened due to the progression of the heat propagation phenomenon, in severe cases, the cooling water (CW) may not be supplied to the downstream water supply holes (340). To solve this problem, the pack case (10) of the present invention includes a plurality of partition separator plates (400) that divide the flow space of the meandering flow path (330) into at least three lanes (410).

[0058] FIG. 5 is an enlarged view of section "B" of FIG. 3. In the illustrated embodiment, two partition plates (400) are spaced apart in parallel along the direction of flow of the cooling water (CW) so as to divide the flow space of the meandering channel (330) into three lanes (410). Here, "lane (410)" refers to a single passage through which the cooling water (CW) flows in a divided manner. Although the drawing illustrates the division into three lanes (410) as an example, a greater number of lanes (410) may be provided.

[0059] A plurality of partition plates (400) may be placed in the flow space for a length corresponding to the area occupied by the battery assembly (510) supported on the support plate (200). For example, if a plurality of battery assemblies (510) are spaced apart along a straight section of the meandering flow path (330), a spaced-out area of ​​the flow space may be formed where the partition plates (400) are not placed between the spaced-out battery assemblies (510). The area where the partition plates (400) are separated forms a rejoining area of ​​the cooling water (CW), and by rejoining the cooling water (CW) that was separated before the cooling water (CW) enters the next battery assembly (510), it is possible to prevent the flow rate difference between the lanes (410) from increasing as it goes downstream.

[0060] And, as shown in the side view of FIG. 6, the multiple partition plates (400) may have a height at which three or more divided lanes (410) communicate in the upper space of the meandering channel (330). That is, the height of the partition plates (400) may be smaller than the height of the meandering channel (330). The height at which the lanes (410) communicate with each other at the top of the partition plates (400) may be about 10% of the total height of the meandering channel (330). By ensuring that the multiple lanes (410) are not completely divided but partially communicate in the upper space, it becomes advantageous to form a uniform flow rate of cooling water (CW) between the lanes (410).

[0061] The water supply holes (340) can be arranged in a zigzag pattern with an equal number for the plurality of lanes (410). By arranging the water supply holes (340) with an equal number for the plurality of lanes (410), the overall discharge flow rate of the cooling water (CW) can be maintained evenly regardless of which water supply hole (340) is opened. Additionally, it may be preferable for the plurality of water supply holes (340) to be arranged in a zigzag pattern with respect to the direction of the cooling water (CW) flow. Arranging in a zigzag pattern means that they are arranged staggeredly rather than on the same line with respect to the direction of the cooling water (CW) flow, as shown in FIG. 5. By arranging the water supply holes (340) in a zigzag shape, the discharge range of the cooling water (CW) supplied to the battery assembly (510) is expanded, and the probability that the meltable plug (350) will be removed quickly by receiving heat increases even if overheating occurs in any part of the battery assembly (510).

[0062] In an exemplary embodiment, the water supply hole (340) of the central lane (412) among the three lanes (410) may be positioned furthest downstream with respect to the direction of flow of the cooling water (CW). And, since the water supply holes (340) are evenly distributed for each lane (410), the water supply holes (340) of the two lanes (414) may be positioned upstream and staggered. In the illustrated embodiment, the positions of the water supply holes (340) of the two lanes (414) may be swapped with each other. To ensure even discharge of the cooling water (CW), the distance between adjacent water supply holes (340) may be equal.

[0063] And, referring to FIG. 4, the illustrated battery pack (500) has a plurality of battery assemblies (510) in close contact with the cooling plate (300) so that cooling by the cooling plate (300) can occur smoothly. And, as shown in FIG. 3, the meandering path (330) inside the cooling plate (300) forms a path that passes through each battery assembly (510) at least once, thereby enabling uniform cooling for all battery assemblies (510).

[0064]

[0065] [Second embodiment]

[0066] FIG. 7 is a drawing illustrating an embodiment of a partition separator (400) forming a branch passage (422). In the illustrated embodiment, a plurality of partition separators (400) are provided with a pair of folded openings (420) that form a branch passage (422) extending from the central lane (412) toward adjacent lanes (414). Here, FIG. 7 is a drawing illustrating a part of a meandering flow path (330), and the configuration of the partition separator (400) having a pair of folded openings (420) can be repeated along the flow direction of the coolant (CW). For example, one structure of FIG. 7 may be provided during a section passing through a battery assembly (510).

[0067] As shown in FIG. 7, the bending opening (420) is bent from the central lane (412) toward the two side lanes (414), and accordingly, the bending opening (420) can form an inclined surface that diverges toward the cooling water (CW) flowing through the central lane (412). Also, the flow cross-sectional area of ​​the central lane (412) may be larger than the flow cross-sectional area of ​​each of the two side lanes (414). Thus, the cooling water (CW) flowing through the central lane (412) can be redistributed to the two side lanes (414) through the bending opening (420).

[0068] The bent opening (420) forms an obtusely inclined surface with respect to the cooling water (CW) flowing through the central lane (412), thereby creating a smooth streamline in which no vortex is generated in the flow of the cooling water (CW) redistributed to the two lanes (414). Additionally, as the bent opening (420) protrudes toward the two lanes (414), the effect of the pressure drop occurring while the cooling water (CW) is discharged through the opening of any water supply hole (340) on the two lanes (414) is reduced to the discharge of cooling water (CW) from the downstream water supply hole (340) of the same lane (414). That is, as the bent opening (420) protrudes toward the two lanes (414), the flow rate variation of the cooling water (CW) discharged from the multiple water supply holes (340) on the two lanes (414) is reduced.

[0069] In addition, based on the water supply hole (340) placed in the central lane (412), a pair of folded openings (420) can be distributed upstream and downstream in the direction of the flow of cooling water (CW). The staggered arrangement of the folded openings (420) is intended to ensure uniform redistribution of cooling water (CW) to both lanes (414), and is also advantageous for ensuring that a sufficient flow of cooling water (CW) is discharged from the water supply hole (340) on the central lane (412).

[0070]

[0071] 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.

[0072] [Explanation of the symbol]

[0073] 10: Pack case

[0074] 100: Pack bottom plate

[0075] 200: Support plate

[0076] 210: Venting Hall

[0077] 220: Side frame

[0078] 230: Lower venting channel

[0079] 300: Cooling plate

[0080] 310: Inlet

[0081] 320: Outlet

[0082] 330: Gambling Euro

[0083] 340: Jusu Hall

[0084] 350: Fusible plug

[0085] 400: Partition divider

[0086] 410: Lane

[0087] 412: Center lane

[0088] 414: Both lanes

[0089] 420: Folded opening

[0090] 422: Branching passage

[0091] 500: Battery pack

[0092] 510: Battery Assembly

[0093] 512: Battery cell

[0094] 514: Lower housing

[0095] 516: Through hole

[0096] 520: Venting device

[0097] CW: Coolant

[0098] 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, A pack case comprising a cooling plate, a water injection hole formed on the meandering flow path, a melting plug that closes the water injection hole, and a plurality of compartment separators that divide the flow space of the meandering flow path into at least three lanes.

2. In Paragraph 1, The above plurality of compartment separator plates are, A pack case disposed in the fluid space for a length corresponding to the area occupied by the battery assembly supported on the support plate.

3. In Paragraph 2, The above plurality of compartment separator plates are, A pack case having a height in which the above-described three or more lanes communicate in the upper space of the above-described meandering channel.

4. In Paragraph 2, The above plurality of partition plates divide the flow space of the meandering channel into three lanes, and A pack case in which the above-mentioned water supply holes are arranged in a zigzag pattern with an equal number for three lanes.

5. In Paragraph 4, The above-mentioned water injection hole is, A pack case in which the water supply hole of the central lane among the three lanes above is positioned furthest downstream with respect to the direction of cooling water flow.

6. In Paragraph 5, The above plurality of compartment separator plates are, A pack case having a pair of folded openings forming branch passages toward adjacent lanes from the central lane.

7. In Paragraph 6, The above-mentioned folded opening is, A pack case that is bent from the central lane toward the two side lanes, and accordingly, the bent opening forms an inclined surface that diverges toward the cooling water flowing in the central lane.

8. In Paragraph 7, Based on the water supply hole located in the central lane above, A pack case in which the above-mentioned pair of folded openings are distributed upstream and downstream in the direction of cooling water flow.

9. In Paragraph 6, Pack case, wherein the flow cross-sectional area of ​​the central lane is larger than the flow cross-sectional area of ​​each of the two lanes.

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

11. A pack case according to any one of paragraphs 1 through 10; 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.

12. In Paragraph 11, The meltable plug is melted by a thermal event occurring in any of the battery assemblies above, and the water injection hole is opened, and Coolant discharged from the above-mentioned open water supply hole is supplied to the above-mentioned battery assembly, and A battery pack in which the coolant supplied to the above battery assembly flows into the above lower venting channel.

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