Battery pack

Abstract

A battery pack according to an embodiment of the present invention may comprise: a case comprising a base plate and a side wall installed on the base plate; a battery module located inside the case and including a rear end cover having a venting hole facing the side wall; and a partition wall located inside the case and having a through-hole facing the gap between the rear end cover and the side wall.

Description

battery pack

[0001] The present invention relates to a battery pack.

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0178732 filed on December 4, 2024, and all contents disclosed in the specification and drawings of said application are incorporated into this application by reference.

[0003] As the demand for portable electronic products such as smartphones, tablet PCs, and smartwatches increases significantly and electric vehicles become increasingly widespread, research on batteries installed in them, particularly secondary batteries capable of repeated charging and discharging, is actively underway.

[0004] Currently commercialized secondary batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium secondary batteries. Among these, lithium secondary batteries are gaining attention for their advantages, such as the ability to freely charge and discharge with almost no memory effect compared to nickel-based secondary batteries, a very low self-discharge rate, and high energy density.

[0005] These lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte.

[0006] Generally, lithium secondary batteries can be classified according to the shape of the casing into can-type secondary batteries, in which the electrode assembly is embedded in a metal can, and pouch-type secondary batteries, in which the electrode assembly is embedded in a pouch of aluminum laminate sheet.

[0007] Recently, secondary batteries are widely used for driving or energy storage not only in small devices such as portable electronic devices but also in medium-to-large devices such as electric vehicles and Energy Storage Systems (ESS). A single battery module can be formed by housing multiple such secondary batteries together inside a module case while electrically connected. In this case, each secondary battery included in a single battery module can be referred to as a battery cell. Furthermore, multiple such battery modules can be connected to form a single battery pack.

[0008] However, when a battery pack contains multiple battery modules, and each module contains multiple battery cells, it may be vulnerable to thermal chain reactions between modules or cells. For example, if an event such as thermal runaway occurs within a single battery module, it is necessary to suppress the propagation of this runaway to other battery modules or cells. If the propagation of thermal runaway between modules or cells is not properly suppressed, an event originating in a specific module or cell may trigger a chain reaction of thermal reactions in other modules or cells, potentially causing explosions or fires, or significantly amplifying their scale.

[0009] In particular, if an event such as thermal runaway occurs in a single battery module, gases or flames may be randomly released to the outside. If the release of such gases or flames is not properly controlled, they may be released toward other battery modules, potentially causing a thermal chain reaction in those modules. Specifically, module terminals may be located on the front side of a battery module to provide electrical connections to other battery modules or battery packs, such as module busbars. Therefore, if flames are released toward the front of such a battery module, they can damage the module terminals within the battery pack and cause an electrical short circuit. Furthermore, since other battery modules may be located in front of a specific battery module, if flames are released toward the front of that module, the emitted flames may spread toward other modules, making it easy for fire to spread between battery modules.

[0010] If thermal propagation between battery modules or between battery cells is not properly controlled, a rapid voltage drop in the battery module or battery pack may occur. This can lead to a sudden shutdown of the device equipped with the battery module or battery pack, causing unexpected damage. For example, if a sudden voltage drop in the battery pack occurs while an electric vehicle is in operation, there may not be enough time to move the electric vehicle to a safe location.

[0011] Furthermore, if thermal propagation between battery modules or battery cells is not properly controlled and a fire or explosion occurs suddenly, there is a high possibility of causing casualties to users. For example, if thermal runaway occurs in an electric vehicle and a certain amount of time is not secured before it progresses into a full-scale fire, the occupants may not be able to escape safely.

[0012] Accordingly, the present invention is devised to solve the above-mentioned problems and aims to provide a battery pack with an improved structure capable of appropriately controlling the discharge of flames, etc. generated inside the battery module, and a vehicle including the same.

[0013] In addition, the present invention may aim to provide a structure capable of preventing damage to the exterior of a battery pack when a thermal event occurs.

[0014] In addition, the present invention may aim to prevent flames or flammable particles from being emitted to the outside of the battery pack when a thermal event occurs.

[0015] In addition, the present invention may aim to provide a structure capable of suppressing heat propagation between battery modules.

[0016] In addition, the present invention may aim to provide a structure capable of rapidly diffusing or dispersing high-temperature particles emitted when a thermal event occurs.

[0017] In addition, the present invention may aim to provide a structure capable of rapidly diffusing or dispersing high-temperature venting gas emitted when a thermal event occurs.

[0018] 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 those skilled in the art from the description of the invention below.

[0019] A battery pack according to one embodiment of the present invention for achieving the above-mentioned purpose may include: a case comprising a base plate and a side wall installed on the base plate; a battery module comprising a rear end cover located inside the case and having a venting hole facing the side wall; and a partition wall located inside the case and having a through hole facing the gap between the rear end cover and the side wall.

[0020] Additionally, the partition wall may include: a main wall installed on the base plate and covering one side of the battery module; and a flow guide extending from the main wall between the rear end cover and the side wall.

[0021] In addition, the above flow guide can be placed over the above through hole.

[0022] In addition, the above-mentioned flow guide can connect the side wall and the main wall at an angle.

[0023] In addition, the above flow guide can connect the side wall and the main wall with a curved surface.

[0024] In addition, the above flow guide can cover a part of the above rear end cover.

[0025] In addition, the battery pack may further include a fastening member that connects the fluid guide and the side wall.

[0026] In addition, the above-mentioned through hole can be opened downward.

[0027] In addition, the above-mentioned through hole can be opened to the rear.

[0028] In addition, the above through hole may expose the side wall or base plate.

[0029] In addition, the battery module may further include a power terminal protruding forward.

[0030] An automobile according to one aspect of the present invention includes a battery pack of the present invention.

[0031] According to at least one of the embodiments of the present invention, when gas or flame is generated inside a battery module, the discharge of such gas or flame can be appropriately controlled.

[0032] According to at least one of the embodiments of the present invention, external damage to the battery pack can be prevented even if a thermal event occurs.

[0033] According to at least one of the embodiments of the present invention, the electrical safety of the battery pack can be improved.

[0034] According to at least one of the embodiments of the present invention, heat propagation between battery modules can be suppressed when a thermal event occurs.

[0035] According to at least one of the embodiments of the present invention, high-temperature particles emitted when a thermal event occurs can be rapidly diffused or dispersed.

[0036] According to at least one of the embodiments of the present invention, high-temperature venting gas emitted when a thermal event occurs can be rapidly diffused or dispersed.

[0037] 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.

[0038] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0039] Figure 2 is a diagram showing a partial configuration of the battery pack of Figure 1 separated.

[0040] Figure 3 is a diagram showing a partial configuration of the battery pack of Figure 2 separated.

[0041] Figure 4 is a drawing showing the battery module of Figure 3.

[0042] Figure 5 is a diagram showing a partial configuration of the battery module of Figure 4 separated.

[0043] Figure 6 is a diagram showing a part of the configuration of the battery module of Figure 5 in a different direction.

[0044] Figure 7 is a drawing showing the battery module of Figure 4 in a different direction.

[0045] Figure 8 is a drawing showing the first partition wall of Figure 3.

[0046] Figure 9 is a diagram showing a part of the configuration of the battery pack of Figure 2.

[0047] Figure 10 is a drawing showing a cross-sectional configuration along the cutting line A-A' of Figure 1.

[0048] Figure 11 is a drawing showing the cross-sectional configuration along the cutting line B-B' of Figure 1.

[0049] FIG. 12 is a drawing showing a vehicle according to one aspect of the present invention.

[0050] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, and should be interpreted in a meaning and concept consistent with the technical spirit of the present invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0051] Therefore, the embodiments described in this specification and the configurations illustrated in the drawings are merely examples of the present invention and do not represent all aspects of the technical concept of the present invention; thus, it should be understood that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0052] FIG. 1 is a drawing showing a battery pack (1000) according to an embodiment of the present invention. FIG. 2 is a drawing showing a partial configuration of the battery pack (1000) of FIG. 1 separated. FIG. 3 is a drawing showing a partial configuration of the battery pack (1000) of FIG. 2 separated.

[0053] Referring to FIGS. 1 to 3, the case (100) may provide an internal space. The case (100) may include a base plate (110). The base plate (110) may have a rectangular shape. The base plate (110) may have a flat shape. The base plate (110) may form the exterior of the battery pack (1000). The base plate (110) may provide an internal space for the battery pack (1000).

[0054] The case (100) may include a side wall (120). The side wall (120) may be installed, fastened, fixed, joined, or attached to the upper surface of the base plate (110). The side wall (120) may be provided along the perimeter of the base plate (110). For example, the side wall (120) may be composed of four. The side wall (120) may provide an internal space for the battery pack (1000).

[0055] The case (100) may include a pack cover (150). The pack cover (150) may have a square plate shape. The pack cover (150) may have a flat plate shape. The pack cover (150) may form the exterior of the battery pack (1000). The pack cover (150) may cover the internal space of the battery pack (1000). The pack cover (150) may be installed, fastened, fixed, coupled, or attached to the side wall (120).

[0056] A battery pack (1000) according to one embodiment of the present invention may include a partition wall (300). The partition wall (300) may include a first partition wall (310) and a second partition wall (320). The partition wall (300) may be provided in multiple numbers. The partition wall (300) may be installed, fastened, fixed, coupled, or attached to the upper surface of a base plate (110). The partition wall (300) may partition the internal space of the battery pack (1000).

[0057] The first partition wall (310) may be extended along the front-rear direction or the X-axis direction. The first partition wall (310) may be provided in multiple numbers. The multiple first partition walls (310) may be arranged along the left-right direction or the Y-axis direction.

[0058] The second partition wall (320) may be extended along the left-right direction or the Y-axis direction. A plurality of first partition walls (310) may be arranged on each side of the second partition wall (320).

[0059] The battery module (200) may be placed inside the case (100). The battery module (200) may be installed, fastened, fixed, coupled, or attached to the upper surface of the base plate (110). The battery module (200) may be provided in multiple numbers. For example, the battery module (200) may be composed of eight units. The battery module (200) may be located in the space partitioned by the partition wall (300).

[0060] A venting device (500) may be installed on a side wall (120). For example, the venting device (500) may be installed on the left side wall (120). For example, the venting device (500) may be a gas valve. The venting device (500) may open to discharge gas when the pressure inside the case (100) increases. Additionally, the venting device (500) may block external air from entering the case (100). Multiple venting devices (500) may be provided.

[0061] FIG. 4 is a drawing showing the battery module (200) of FIG. 3. FIG. 5 is a drawing showing a part of the battery module (200) of FIG. 4 separated. FIG. 6 is a drawing showing a part of the battery module (200) of FIG. 5 in a different direction. FIG. 7 is a drawing showing the battery module (200) of FIG. 4 in a different direction.

[0062] Referring to FIGS. 4 through 7, the battery module (200) may include a module case (210), a plurality of battery cells (220), a pad (250), a front busbar frame assembly (231), a rear busbar frame assembly (232), a front insulation cover (261), a rear insulation cover (262), a front end cover (241), and a rear end cover (242).

[0063] The module case (210) may have a rectangular shape. The module case (210) may provide space inside. The module case (210) may be equipped with a top plate, a bottom plate, and a pair of side plates. Additionally, the module case (210) may have a shape with the front and rear open.

[0064] A battery cell (220) can be accommodated inside a module case (210). A plurality of battery cells (220) may be provided. A battery cell (220) may refer to a secondary battery. In particular, a battery cell (220) may be a pouch-type secondary battery. However, the shape of the battery cell (220) is not limited to a pouch shape and may have various shapes, such as a cylindrical shape or a rectangular shape.

[0065] A plurality of battery cells (220) may be stacked along the left-right direction or the Y-axis direction. A battery cell (220) may include a storage portion (221) having an electrode assembly, a first sealing portion (222) protruding toward the front and rear sides of the storage portion (221), and a second sealing portion (223) protruding toward the upper side of the storage portion (221). Additionally, a battery cell (220) may include electrode leads (224) protruding toward the front and rear sides of the first sealing portion (222), respectively. Each battery cell (220) may be extended along the front-rear direction or the X-axis direction. The electrode leads (224) may protrude toward the front and rear of each battery cell (220).

[0066] A pad (250) may be placed between multiple battery cells (220). The pad (250) may be placed between at least some of the battery cells (220) and / or on the outer edge of the stack. For example, the pad (250) may be configured to be placed between every four battery cells (220) stacked in the left-right direction.

[0067] These pads (250) may be provided with an elastic material to absorb swelling of the battery cell (220). For example, the pads (250) may be made of a foam material such as polyurethane. Alternatively, the pads (250) may be provided with a material capable of blocking heat or flames. For example, the pads (250) may be provided with an insulating or fireproof material such as silicone or mica.

[0068] A front busbar frame assembly (231) may be provided in front of a plurality of battery cells (220). The front busbar frame assembly (231) may be electrically connected to the front side electrode leads (224) of the plurality of battery cells (220).

[0069] The rear busbar frame assembly (232) may be provided at the rear of a plurality of battery cells (220). The rear busbar frame assembly (232) may be electrically connected to the rear side electrode leads (224) of the plurality of battery cells (220).

[0070] The front end cover (241) can be attached to the front of the module case (210). The front end cover (241) can cover the front of the module case (210). The front end cover (241) can have a rectangular shape.

[0071] The rear end cover (242) can be attached to the rear of the module case (210). The rear end cover (242) can cover the rear of the module case (210). The rear end cover (242) can have a square shape.

[0072] The front insulation cover (261) may be positioned between the front end cover (241) and the front busbar frame assembly (231). The front insulation cover (261) may electrically insulate the front busbar frame assembly (231) and the front end cover (241).

[0073] The rear insulation cover (262) may be positioned between the rear end cover (242) and the rear busbar frame assembly (232). The rear insulation cover (262) may electrically insulate the rear busbar frame assembly (232) and the rear end cover (242).

[0074] The rear busbar frame assembly (232) may include a frame (232a) and a busbar (232b). The busbar (232b) may be installed on the frame (232a). The busbar (232b) may be electrically connected to the rear side electrode leads (224) of a plurality of battery cells (220). A plurality of busbars (232b) may be provided. A plurality of busbars (232b) may be arranged along the left-right direction or the Y-axis direction. Additionally, the frame (232a) may have a first venting hole (232c). The first venting hole (232c) may be a through hole. The first venting hole (232c) may face the rear side first sealing portion (222) of the battery cell (220). A plurality of first venting holes (232c) may be provided. Some of the multiple first venting holes (232c) may be placed between two adjacent busbars (232b).

[0075] According to this configuration of the present invention, venting gas (G) and particles (P) generated inside the battery module (200) can be discharged to the rear of the battery module (200) through the first venting hole (232c).

[0076] The battery module (200) may include a power terminal (231a) that protrudes forward. The power terminal (231a) may be provided in the front busbar frame assembly (231). Additionally, the power terminal (231a) may protrude from the front busbar frame assembly (231). The power terminal (231a) may be provided as a pair. The power terminal (231a) may be exposed to the outside of the battery module (200).

[0077] Additionally, the power terminal (231a) can be electrically connected to the power terminal (231a) of an adjacent battery module (200). The interbusbar (600, see FIG. 2 and FIG. 3) can electrically connect the adjacent battery module (200).

[0078] According to this configuration of the present invention, the thermal safety of the battery pack (1000) can be improved. Major components such as a power terminal (231a), a control terminal, and an interbusbar (600) can be arranged on the front side of the battery module (200). By venting gas (G) and particles (P) to the rear side of the battery module (200), damage to the front side of the battery module (200) can be minimized. By minimizing damage to the front side of the battery module (200), the propagation of thermal events to neighboring battery modules (200) can be suppressed.

[0079] A rear insulating cover (262) of a battery pack (1000) according to one embodiment of the present invention may have a second venting hole (262a). The second venting hole (262a) may be a through hole. The second venting hole (262a) may face a rear busbar frame assembly (232) or a first venting hole (232c). Additionally, the second venting hole (262a) may be in communication with the first venting hole (232c). The second venting hole (262a) may be provided in multiple numbers. Multiple second venting holes (262a) may be in communication with multiple first venting holes (232c).

[0080] A battery module (200) of a battery pack (1000) according to one embodiment of the present invention may further include a fireproof sheet (270). The fireproof sheet (270) may include a material with high heat resistance or fire resistance. The fireproof sheet (270) may be located on the inner side of the rear end cover (242). Additionally, the fireproof sheet (270) may be located between the rear end cover (242) and the rear insulation cover (262). Additionally, the fireproof sheet (270) may be fixed between the rear end cover (242) and the rear insulation cover (262).

[0081] The fireproof sheet (270) may be positioned between the third venting hole (242a) and the second venting hole (262a). The fireproof sheet (270) may cover a plurality of third venting holes (242a) and a plurality of second venting holes (262a).

[0082] According to this configuration of the present invention, the thermal safety of the battery pack (1000) can be improved. When a thermal event occurs, the internal pressure of the module case (210) may increase due to the venting gas (G) and particles (P). As a result, a portion of the fireproof sheet (270) may rupture. And due to the rupture of the fireproof sheet (270), a portion of the second venting hole (262a) and a portion of the third venting hole (242a) may be connected, and the venting gas (G) and particles (P) may be discharged. Additionally, the unruptured portion of the fireproof sheet (270) may still cover the remaining second venting hole (262a) and the remaining third venting hole (242a). As a result, the venting gas (G) and particles (P) discharged to the outside of the battery module (200) may be prevented from flowing into the interior of the battery module (200).

[0083] FIG. 8 is a drawing showing the first partition wall (310) of FIG. 3. FIG. 9 is a drawing showing a part of the configuration of the battery pack (1000) of FIG. 2.

[0084] Referring to FIGS. 8 and 9, the first partition wall (310) may include a main wall (311). The main wall (311) may be installed, fastened, fixed, coupled, or attached to the upper surface of the base plate (110). The main wall (311) may be extended along the front-rear direction or the X-axis direction. The main wall (311) may cover one side of the battery module (200). The main wall (311) may cover the left side or the right side of the battery module (200).

[0085] The battery module (200) may be spaced apart from the side wall (120). A gap may be formed between the battery module (200) and the side wall (120). The gap between the battery module (200) and the side wall (120) may be referred to as the venting space (VS). The rear end cover (242) may be spaced apart from the side wall (120). The gap between the rear end cover (242) and the side wall (120) may be referred to as the venting space (VS). The battery module (200) may discharge venting gas (G) and particles (P) into the venting space (VS).

[0086] The first partition wall (310) may be provided with a passing hole (313). The passing hole (313) may be formed between the side wall (120) and the main wall (311). The passing hole (313) may face a gap formed between the rear end cover (242) and the side wall (120). The passing hole (313) may be in communication with the space between the rear end cover (242) and the side wall (120). The passing hole (313) may face a venting space (VS). The passing hole (313) may be in communication with the venting space (VS).

[0087] When a thermal event occurs, a large amount of particles (P) may be discharged. A large amount of particles (P) discharged into the venting space (VS) may flow along the base plate (110) or side wall (120) by gravity. A large amount of particles (P) may flow along the venting space (VS). A large amount of particles (P) may flow through the through hole (313). A large amount of particles (P) may flow along the left-right direction or the Y-axis direction. If the flow of high-temperature particles (P) is blocked or high-temperature particles (P) are stagnant, a thermal event may be propagated by the particles (P). However, according to one embodiment of the present invention, the propagation of a thermal event caused by particles (P) may be suppressed by the dispersion or diffusion of high-temperature particles (P).

[0088] The through hole (313) can be opened downward or along the -Z axis direction. The through hole (313) can expose the base plate (110). According to this configuration of the present invention, a large amount of particles (P) can flow easily. The through hole (313) can minimize the flow resistance of the particles (P).

[0089] The through hole (313) may be opened along the rear or -X axis direction. The through hole (313) may expose the side wall (120). According to this configuration of the present invention, a large amount of particles (P) can flow easily. The through hole (313) can minimize flow resistance of the particles (P).

[0090] The first partition wall (310) may include a flow guide (312). The flow guide (312) may extend from the main wall (311) in the rearward or -X-axis direction. The flow guide (312) may extend between the rear end cover (242) and the side wall (120). The flow guide (312) may connect the side wall (120) and the main wall (311). The flow guide (312) may be in contact with, installed, fastened, fixed, coupled, or attached to the side wall (120). The flow guide (312) may cover at least a portion of the rear end cover (242).

[0091] When a thermal event occurs, the venting gas (G) may rise. The venting gas (G) discharged into the venting space (VS) may flow along the side wall (120). The venting gas (G) may flow along the venting space (VS). The venting gas (G) may flow along the left-right direction or the Y-axis direction. If the flow of the high-temperature venting gas (G) is blocked or the high-temperature venting gas (G) is stagnant, the thermal event may be propagated by the venting gas (G). However, according to one embodiment of the present invention, the propagation of the thermal event caused by the venting gas (G) may be suppressed by the high-temperature venting gas (G) being dispersed or diffused into the internal space of the case (100) along the flow guide (312).

[0092] A flow guide (312) can be placed above a through hole (313). When a thermal event occurs, particles (P) may move downward by gravity, and venting gas (G) may rise. As a result, the through hole (313) that diffuses or disperses the particles (P) can be placed below, and the flow guide (312) that diffuses or disperses the venting gas (G) can be placed above.

[0093] FIG. 10 is a drawing showing a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 11 is a drawing showing a cross-sectional configuration along the cutting line B-B' of FIG. 1.

[0094] Referring to FIGS. 10 and 11, when a thermal event occurs, particles (P) can flow through the through hole (313) in the left-right direction or along the Y-axis direction. The venting gas (G) flows in the left-right direction or along the Y-axis direction and can then be dispersed or diffused forward or along the X-axis direction by the flow guide (312).

[0095] The flow guide (312) can connect the side wall (120) and the main wall (311) at an angle. The flow guide (312) can be positioned at an angle relative to the side wall (120). The flow guide (312) can be positioned at an angle relative to the main wall (311). The venting gas (G) can be dispersed or diffused along the inclined surface formed by the flow guide (312).

[0096] The flow guide (312) can connect the side wall (120) and the main wall (311) in a curved manner. The venting gas (G) can be dispersed or diffused along the curved surface formed by the flow guide (312).

[0097] The cross-section perpendicular to the Z-axis of the flow guide (312) may have an area that increases as it moves toward the rear or in the -X-axis direction. The width of the flow guide (312) in the left-right direction or in the Y-axis direction may have an area that increases as it moves toward the rear or in the -X-axis direction.

[0098] The flow guide (312) can be installed, fastened, fixed, or coupled to the side wall (120) by means of a fastening member (S).

[0099] The battery pack (1000) according to the present invention may further include various components of a battery pack known at the time of filing the present invention, such as a BMS, a busbar, a relay, a current sensor, etc.

[0100] FIG. 12 is a drawing showing a vehicle (V) according to one aspect of the present invention.

[0101] Referring to FIG. 12, the battery pack (1000) according to the present invention can be applied to a vehicle (V), such as an electric vehicle or a hybrid vehicle. That is, the vehicle (V) according to the present invention may include the battery pack (1000) according to the present invention. In addition, the vehicle (V) according to the present invention may further include various other components included in the vehicle in addition to the battery pack (1000). For example, the vehicle (V) according to the present invention may further include a vehicle body, a motor, an electronic control unit (ECU), and other control devices.

[0102] As described above, although the present invention has been explained by limited embodiments and drawings, the present invention is not limited thereto, and it is obvious that various modifications and variations are possible within the scope of the technical spirit of the present invention and the equivalent scope of the claims described below by those skilled in the art to which the present invention belongs.

Claims

1. A case comprising a base plate and a side wall installed on the base plate; A battery module comprising a rear end cover located inside the above case and having a venting hole facing the side wall; A battery pack comprising a partition wall located inside the above case and having a through hole facing the gap between the rear end cover and the side wall.

2. In Paragraph 1, The above partition wall is: A main wall installed on the base plate and covering one side of the battery module; and, A battery pack including a flow guide extending from the main wall to between the rear end cover and the side wall.

3. In Paragraph 2, The above flow guide is, A battery pack placed over the above through hole.

4. In Paragraph 2, The above flow guide is, A battery pack that connects the above side wall and the above main wall at an angle.

5. In Paragraph 2, The above flow guide is, A battery pack that connects the above side wall and the above main wall with a curved surface.

6. In Paragraph 2, The above flow guide is, A battery pack covering a part of the rear end cover.

7. In Paragraph 2, A battery pack further comprising a fastening member that fastens the above-mentioned fluid guide and the above-mentioned side wall.

8. In Paragraph 1, The above through hole is, Battery pack that opens downwards.

9. In Paragraph 1, The above through hole is, Battery pack that opens to the rear.

10. In Paragraph 1, The above through hole is, A battery pack exposing the above side wall or base plate.

11. In Paragraph 1, The above battery module is, A battery pack including additional power terminals protruding forward.

12. An automobile comprising a battery pack according to any one of claims 1 to 11.

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