Battery assembly

Abstract

A battery assembly is disclosed. The battery assembly according to an embodiment of the present invention may comprise: a case providing a space therein and having a cover; and a battery cell located inside the case, wherein the cover comprises: a body providing a first inner space and a second inner space and having a discharge port positioned between the first inner space and the second inner space; a first material disposed in the first inner space; a second material disposed in the second inner space; and a trigger member for covering the discharge port and partitioning the first inner space from the second inner space.

Description

Battery assembly

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

[0002] This application is a priority application for Korean Patent Application No. 10-2024-0147818 filed on October 25, 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 rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion batteries are gaining attention for their advantages, such as high energy density, very low self-discharge rate, and virtually no memory effect compared to nickel-based rechargeable batteries, which allows for free transferability.

[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] The present invention was devised to solve the above-mentioned problems and aims to provide a battery assembly with an improved structure capable of appropriately controlling the discharge of flames, etc., generated inside the battery assembly, and an automobile including the same.

[0013] Another objective of the present invention may be to provide a battery assembly capable of discharging a very large volume of material into the case when a thermal event occurs.

[0014] Another objective of the present invention may be to provide a battery assembly capable of blocking the propagation of a thermal event by filling the interior of the case with a foam material when a thermal event occurs.

[0015] A battery assembly according to one embodiment of the present invention for achieving the above-mentioned purpose comprises: a case having a cover that provides an internal space; and a battery cell located inside the case, wherein the cover may include: a body having a discharge port located between the first internal space and the second internal space, and providing a first internal space and a second internal space; a first material disposed in the first internal space; a second material disposed in the second internal space; and a trigger member that covers the discharge port and partitions the first internal space and the second internal space.

[0016] In addition, the trigger member may be configured to be damaged upon the occurrence of a thermal event.

[0017] In addition, the trigger member may include a glass bulb.

[0018] In addition, the trigger member may include a melting member.

[0019] In addition, the above trigger member may be provided in multiple numbers.

[0020] In addition, the first material and the second material may be configured to react and expand.

[0021] In addition, the discharge port may be formed facing the interior of the case.

[0022] In addition, the discharge port can connect the first internal space and the second internal space.

[0023] In addition, the cover may further include a partition that separates the first internal space and the second internal space.

[0024] Additionally, the case includes a base plate positioned below the battery cell, and the cover may be a side cover installed on the upper surface of the base plate.

[0025] Additionally, the first internal space is located above the second internal space, and the density of the first material can be configured to be higher than the density of the second material.

[0026] Additionally, the case may include a base plate positioned below the battery cell, and the cover may be a top cover positioned above the battery cell.

[0027] An automobile according to one aspect of the present invention includes a battery assembly of the present invention.

[0028] According to at least one of the embodiments of the present invention, when a thermal event occurs, flames or particles can be blocked from being discharged to the outside of the case.

[0029] According to at least one embodiment of the present invention, when a thermal event occurs, the inside of the case is filled with a foam material so that the propagation of the thermal event can be blocked.

[0030] 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.

[0031] FIG. 1 is a drawing showing a second battery assembly according to one embodiment of the present invention.

[0032] Figure 2 is a diagram showing a partial configuration of the second battery assembly of Figure 1 separated.

[0033] Figure 3 is a drawing showing the first battery assembly of Figure 2.

[0034] Figure 4 is a diagram showing a partial configuration of the first battery assembly of Figure 3 separated.

[0035] Figure 5 is a diagram showing a partial configuration of the first top cover of Figure 4 separated.

[0036] Figure 6 is a drawing showing the first tower cover of Figure 4.

[0037] Figure 7 is a drawing showing the cross-sectional configuration along the cutting line C-C' of Figure 6.

[0038] Figure 8 is a drawing showing the cross-sectional configuration along the cutting line D-D' of Figure 6.

[0039] Figure 9 is a drawing showing the cross-sectional configuration along the cutting line E-E' of Figure 6.

[0040] Figure 10 is a diagram showing the change in Figure 9 when a thermal event occurs.

[0041] FIG. 11 is a drawing showing a partial configuration of the first side cover of FIG. 4 separated.

[0042] FIG. 12 is a drawing showing the first side cover of FIG. 4.

[0043] FIG. 13 is a drawing showing the cross-sectional configuration along the cutting line F-F' of FIG. 12.

[0044] Figure 14 is a drawing showing the cross-sectional configuration along the cutting line G-G' of Figure 12.

[0045] Figure 15 is a diagram showing the change in Figure 14 when a thermal event occurs.

[0046] Figure 16 is a drawing showing the cross-sectional configuration along the cutting line B-B' of Figure 3.

[0047] Figure 17 is a diagram showing the change in Figure 16 when a thermal event occurs.

[0048] FIG. 18 is a diagram showing a partial configuration of the second top cover of FIG. 2 separated.

[0049] Figure 19 is a drawing showing the second tower cover of Figure 2.

[0050] FIG. 20 is a drawing showing the cross-sectional configuration along the cutting line H-H' of FIG. 19.

[0051] FIG. 21 is a drawing showing the cross-sectional configuration along the cutting line I-I' of FIG. 19.

[0052] FIG. 22 is a drawing showing the cross-sectional configuration along the cutting line J-J' of FIG. 19.

[0053] Figure 23 is a diagram showing the change in Figure 22 when a thermal event occurs.

[0054] FIG. 24 is a drawing showing a partial configuration of the second side cover of FIG. 2 separated.

[0055] FIG. 25 is a drawing showing the second side cover of FIG. 2.

[0056] FIG. 26 is a drawing showing the cross-sectional configuration along the cutting line K-K' of FIG. 25.

[0057] FIG. 27 is a drawing showing the cross-sectional configuration along the cutting line L-L' of FIG. 25.

[0058] Figure 28 is a diagram showing the change in Figure 27 when a thermal event occurs.

[0059] FIG. 29 is a drawing showing a cross-sectional configuration along the cutting line A-A' of FIG. 1.

[0060] Figure 30 is a diagram showing the change in Figure 29 when a thermal event occurs.

[0061] 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.

[0062] Therefore, it should be understood that 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, and that various equivalents and modifications that can replace them may exist at the time of filing this application.

[0063] FIG. 1 is a drawing showing a second battery assembly (1000) according to an embodiment of the present invention. FIG. 2 is a drawing showing a partial configuration of the second battery assembly (1000) of FIG. 1 separated.

[0064] Referring to FIGS. 1 and 2, the second battery assembly (1000) may include a first battery assembly (200). The first battery assembly (200) may be located inside the second case (100). The first battery assembly (200) may be provided in multiple numbers. For example, the first battery assembly (200) may be provided in six numbers. In this case, the first battery assembly (200) may be referred to as a battery module (200). In this case, the second battery assembly (1000) may be referred to as a battery pack (1000).

[0065] FIG. 3 is a drawing showing the first battery assembly (200) of FIG. 2. FIG. 4 is a drawing showing a partial configuration of the first battery assembly (200) of FIG. 3. FIG. 5 is a drawing showing a partial configuration of the first top cover (210a) of FIG. 4. FIG. 6 is a drawing showing the first top cover (210a) of FIG. 4. FIG. 7 is a drawing showing a cross-sectional configuration along the cutting line C-C' of FIG. 6. FIG. 8 is a drawing showing a cross-sectional configuration along the cutting line D-D' of FIG. 6. FIG. 9 is a drawing showing a cross-sectional configuration along the cutting line E-E' of FIG. 6.

[0066] Referring to FIGS. 3 through 9, the first battery assembly (200) may include a first case (201). The first case (201) may have a rectangular shape. The first case (201) may form the exterior of the first battery assembly (200). The first case (201) may provide space inside.

[0067] A battery cell (220) may be located inside a first case (201). The first battery assembly (200) may include a plurality of battery cells (220). In this case, the battery cell (220) may refer to a secondary battery. In particular, the 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.

[0068] The first case (201) may include a cover. The cover may be provided in multiple numbers. The first case (201) may include a first top cover (210a). The first top cover (210a) may have a rectangular shape. The first top cover (210a) may form the exterior of the first battery assembly (200).

[0069] The first top cover (210a) may include a first top body (210a1). The first top body (210a1) may provide an internal space. The first top body (210a1) may provide a first internal space (210a11) and a second internal space (210a12). The first internal space (210a11) and the second internal space (210a12) may be arranged along the front-rear direction or the X-axis direction. The first internal space (210a11) and the second internal space (210a12) may be partitioned.

[0070] The first top body (210a1) may be provided with a first top discharge port (210a3). The first top discharge port (210a3) may be located between the first internal space (210a11) and the second internal space (210a12). The first top discharge port (210a3) may connect the first internal space (210a11) and the second internal space (210a12). The first top discharge port (210a3) may be formed facing the interior of the first case (201).

[0071] The first top cover (210a) may include a first top trigger member (210a4). The first top trigger member (210a4) may be inserted into the first top discharge port (210a3). The first top trigger member (210a4) may cover the first top discharge port (210a3). The first top trigger member (210a4) may partition the first internal space (210a11) and the second internal space (210a12).

[0072] The first material (410) may be placed in the first internal space (210a11). The first material (410) may be accommodated in the first internal space (210a11). The second material (420) may be placed in the second internal space (210a12).

[0073] The second material (420) can be contained in the second internal space (210a12). When a thermal event occurs, the first material (410) and the second material (420) can be mixed. The first material (410) and the second material (420) can chemically react. The first material (410) and the second material (420) can react to produce a third material (430). The third material (430) may be a material with a very large volume. The third material (430) may be a foam material. For example, the third material (430) may include a polyurethane resin-based foam, an epoxy resin-based foam, a phenol resin-based foam, etc.

[0074] Depending on the type of such third material (430), the first material (410) and the second material (420) forming the corresponding third material (430) may be selected separately.

[0075] In the case where the third material (430) is a polyurethane resin-based foam, the first material (410) and the second material (420) may be a polyol compound and an isocyanate-based compound, respectively.

[0076] The above polyol compounds may include polytetramethylene glycol (PTMG), polycaprolactone (PCL), polyethylene glycol (PEG), polyoxytrimethylene ether glycol (PO3G), or two or more of these, but are not limited thereto.

[0077] The above isocyanate compounds include toluene diisocyanate (TDI), naphthalene-1,5-diisocyanate, p-phenylene diisocyanate, tolidine diisocyanate, 4,4'-diphenyl methane diisocyanate, hexamethylene diisocyanate (HDI), dicyclohexylmethane diisocyanate, and methylene diphenyl diisocyanate (MDI). It may include 1-isocyanato-4-[(4-isocyanatohexyl)methyl]cyclohexan (1-isocyanato-4-[(4-isocyanatocyclohexyl)methyl]cyclohexan, H12MDI), isophorone diisocyanate, or two or more of these, but is not limited thereto. Additionally, if the third material (430) is a polyurethane resin-based foam, it may additionally include a blowing agent in addition to the first material (410) and the second material (420), and examples of the blowing agent may include water, hydrofluorocarbon (HFC), methylene chloride, n-butane, isobutane, n-pentane isopentane, dimethyl ether, acetone, carbon dioxide, or two or more of these, but is not limited thereto.

[0078] In the case where the third material (430) is an epoxy resin-based foam, the first material (410) and the second material (420) may be an epoxy resin and a curing agent, respectively.

[0079] The above epoxy resin may include, but is not limited to, an epoxy resin having a glycidylamino group derived from metaxylylenediamine, an epoxy resin having a glycidylamino group derived from paraxylylenediamine, an epoxy resin having a glycidylamino group derived from 1,3-bis(aminomethyl)cyclohexane, an epoxy resin having a glycidylamino group derived from 1,4-bis(aminomethyl)cyclohexane, an epoxy resin having a glycidylamino group derived from diaminodiphenylmethane, an epoxy resin having a glycidylamino group and / or a glycidyloxy group derived from para-aminophenol, an epoxy resin having a glycidyloxy group derived from bisphenol A, an epoxy resin having a glycidyloxy group derived from bisphenol F, an epoxy resin having a glycidyloxy group derived from phenolnovolac, an epoxy resin having a glycidyloxy group derived from resorcinol.

[0080] The above curing agent may include an amine-based curing agent, and 1,3-benzenedimethaneamine, ethylenediamine, 1,3-diaminopropane, 1,4-diaminopropane, hexamethylenediamine, 2,5-dimethylhexamethylenediamine, trimethylhexamethylenediamine, diethylenetriamine, iminobispropylamine, bis(hexamethylene)triamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, N-hydroxyethylethylenediamine, tetra(hydroxyethyl)ethylenediamine, triethyleneglycoldiamine, tetraethyleneglycoldiamine, diethyleneglycolbis(propylamine), polyoxypropylenediamine, polyoxypropylendiamine, isophoronediamine, metacendiamine, N-aminoethylpiperazine, bis(4-amino-3-methyldicyclohexyl)methane, bis(aminomethyl)cyclohexane, 3,9-Bis(3-aminopropyl)2,4,8,10-Tetraoxaspiro(5,5)undecane, norbornendiamine, tetrachloro-p-xylenediamine, m-xylenediamine, p-xylenediamine, m-phenylenediamine, o-phenylenediamine, p-phenylenediamine, 2,4-diaminoanisole, 2,4-toluenediamine, 2,4-diaminodiphenylmethane, 4,4'-diaminodiphenylmethane, 4,4'-diamino1,2-diphenylethane, 2,4-diaminodiphenylsulfone, m-aminophenol, m-aminobenzylamine, benzyldimethylamine, 2-dimethylaminomethyl)phenol, triethanolamine, methylbenzylamine, α-(m-aminophenyl)ethylamine, α-(p-aminophenyl)ethylamine, diaminodiethyldimethyldiphenylmethane, It may include α,α'-bis(4-aminophenyl)-p-diisopropylbenzene, or two or more of these, but is not limited thereto.

[0081] In the case where the third material (430) is a phenol resin-based foam, the first material (410) and the second material (420) may be a phenol compound and an aldehyde compound, respectively.

[0082] The above phenol compounds may include phenol, cresol, xylenol, paraalkylphenol, paraphenylphenol, resorcinol, or two or more of these, but are not limited thereto.

[0083] Examples of the above aldehyde compounds may include formaldehyde, formalin, paraformaldehyde, furfural, acetaldehyde, or two or more of these, but are not limited thereto.

[0084] When a thermal event occurs, the third material (430) can fill the interior of the first case (201). The third material (430) can be expanded to surround the battery cell (220). The third material (430) can block the propagation of particles such as venting gas or flammable particles. The third material (430) can prevent the propagation of the thermal event.

[0085] Referring to FIGS. 3 through 9, the first top trigger member (210a4) may be configured to be damaged upon the occurrence of a thermal event. Venting gas or particles emitted from the battery cell (220) upon the occurrence of a thermal event may damage the first top trigger member (210a4). When the first top trigger member (210a4) is damaged, the first internal space (210a11) and the second internal space (210a12) may be connected. As the first internal space (210a11) and the second internal space (210a12) are connected, the first material (410) and the second material (420) may react. As the first internal space (210a11) and the second internal space (210a12) are connected, a third material (430) may be generated. The third material (430) can be introduced into the interior of the first case (201) along the first tower discharge port (210a3).

[0086] For example, the first tower trigger member (210a4) may include a glass bulb. The glass bulb may be configured to break above a certain temperature. For example, the glass bulb may contain liquid inside, and when the temperature inside the first case (201) rises, the volume of the liquid expands, thereby destroying the glass bulb. When the glass bulb is destroyed, the first tower trigger member (210a4) may detach from the first tower discharge port (210a3). The destroyed glass bulb may fall downward due to gravity. As the glass bulb is destroyed, the first internal space (210a11) and the second internal space (210a12) may be connected.

[0087] For example, the first top trigger member (210a4) may include a melting member. The melting member may include a metal material that can melt at a low temperature. For example, the melting member may be a component such as a fusible link.

[0088] When the temperature inside the first case (201) rises, the melting member may melt. When the melting member melts, the first tower trigger member (210a4) may detach from the first tower discharge port (210a3). The melted melting member may fall downward due to gravity. As the melting member melts, the first internal space (210a11) and the second internal space (210a12) may be connected.

[0089] The first top cover (210a) may include a first top partition (210a2). The first top partition (210a2) may be located inside the first top body (210a1). The first top partition (210a2) may partition the first internal space (210a11) and the second internal space (210a12). The first top partition (210a2) may extend along the left-right direction or the Y-axis direction. A first top discharge port (210a3) may be formed in the first top partition (210a2). The first top partition (210a2) and the first top trigger member (210a4) may partition the first internal space (210a11) and the second internal space (210a12).

[0090] The first tower discharge port (210a3) may be provided in multiple numbers. The first tower trigger member (210a4) may be provided in multiple numbers. The first tower trigger member (210a4) may be arranged to correspond one-to-one with the first tower discharge port (210a3).

[0091] When a thermal event occurs, a plurality of first tower discharge ports (210a3) may be opened. Some of the plurality of first tower discharge ports (210a3) may discharge a third substance (430). Some of the plurality of first tower discharge ports (210a3) may function as passages for air to enter.

[0092] The first case (201) may include a lower frame (210b). The lower frame (210b) may include a first base plate (210b1). The lower frame (210b) may include a side frame (210b2). The side frame (210b2) may be provided as a pair. The pair of side frames (210b2) and the first base plate (210b1) may be formed integrally.

[0093] The first top cover (210a) may be fastened, joined, fixed, or attached to a pair of side frames (210b2). For example, the first top cover (210a) may be joined to the lower frame (210b) by welding. The lower frame (210b) may have a shape with the front and rear open.

[0094] A plurality of battery cells (220) may be placed on the first base plate (210b1). A plurality of battery cells (220) may be placed between the first base plate (210b1) and the first top cover (210a). A plurality of battery cells (220) may be located between a pair of side frames (210b2).

[0095] A battery cell (220) may be extended along the front-rear direction or the X-axis direction. 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. The electrode leads (224) may protrude toward the front and rear sides of each storage portion (221).

[0096] 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.

[0097] 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.

[0098] A busbar frame assembly (230) may be provided on the front and rear sides of a plurality of battery cells (220), respectively. The busbar frame assembly (230) may be electrically connected to the electrode leads (224) of the plurality of battery cells (220).

[0099] FIG. 10 is a diagram showing the change in FIG. 9 when a thermal event occurs. Referring to FIG. 9 and FIG. 10, when a thermal event occurs, the first tower trigger member (210a4) may be damaged and the first tower discharge port (210a3) may be opened. The first material (410) and the second material (420) may react to produce a third material (430). The third material (430) may be discharged in a downward direction or along the -Z axis direction.

[0100] FIG. 11 is a drawing showing a partial configuration of the first side cover (240) of FIG. 4. FIG. 12 is a drawing showing the first side cover (240) of FIG. 4. FIG. 13 is a drawing showing a cross-sectional configuration along the cutting line F-F' of FIG. 12. FIG. 14 is a drawing showing a cross-sectional configuration along the cutting line G-G' of FIG. 12. FIG. 15 is a drawing showing the change of FIG. 14 when a thermal event occurs.

[0101] The first case (201) may include a first side cover (240). The first side cover (240) may have a rectangular shape. The first side cover (240) may form the exterior of the first battery assembly (200). The first side cover (240) may be provided as a pair. The first side cover (240) may be provided as a front side first side cover (240) and a rear side first side cover (240).

[0102] The first side cover (240) may be fastened, joined, fixed, or attached to the first top cover (210a). For example, the first side cover (240) may be joined to the first top cover (210a) by welding.

[0103] The first side cover (240) may be fastened, joined, fixed, or attached to the lower frame (210b). For example, the first side cover (240) may be joined to the lower frame (210b) by welding.

[0104] The first front side cover (240) and the first rear side cover (240) may have a symmetrical structure. Below, the description will be based on the first front side cover (240).

[0105] The first side cover (240) may include a first side body (241). The first side body (241) may provide an internal space. The first side body (241) may provide a first internal space (241a) and a second internal space (241b). The first internal space (241a) and the second internal space (241b) may be arranged along the vertical direction or the Z-axis direction. The first internal space (241a) may be located above the second internal space (241b). The first internal space (241a) and the second internal space (241b) may be partitioned.

[0106] The first side body (241) may be provided with a first side discharge port (243). The first side discharge port (243) may be located between the first internal space (241a) and the second internal space (241b). The first side discharge port (243) may connect the first internal space (241a) and the second internal space (241b). The first side discharge port (243) may be formed facing the interior of the first case (201).

[0107] The first side cover (240) may include a first side trigger member (244). The first side trigger member (244) may be inserted into the first side discharge port (243). The first side trigger member (244) may cover the first side discharge port (243). The first side trigger member (244) may partition the first internal space (241a) and the second internal space (241b).

[0108] The first material (410) may be placed in the first internal space (241a). The first material (410) may be accommodated in the first internal space (241a). The second material (420) may be placed in the second internal space (241b). The second material (420) may be accommodated in the second internal space (241b).

[0109] When a thermal event occurs, the first substance (410) and the second substance (420) may be mixed. The first substance (410) and the second substance (420) may chemically react. The first substance (410) and the second substance (420) may react to produce a third substance (430). The third substance (430) may be a substance with a very large volume. The third substance (430) may be a foam material.

[0110] When a thermal event occurs, the third material (430) can fill the interior of the first case (201). The third material (430) can be expanded to surround the battery cell (220). The third material (430) can block the propagation of particles such as venting gas or flammable particles. The third material (430) can prevent the propagation of the thermal event.

[0111] The first side trigger member (244) may be configured to be damaged upon the occurrence of a thermal event. Venting gas or particles emitted from the battery cell (220) upon the occurrence of a thermal event may damage the first side trigger member (244). When the first side trigger member (244) is damaged, the first internal space (241a) and the second internal space (241b) may be connected. As the first internal space (241a) and the second internal space (241b) are connected, the first material (410) and the second material (420) may react. As the first internal space (241a) and the second internal space (241b) are connected, a third material (430) may be generated. The third material (430) may be introduced into the interior of the first case (201) along the first side discharge port (243).

[0112] For example, the first side trigger member (244) may include a glass bulb. The glass bulb may be configured to break above a certain temperature. For example, the glass bulb may contain liquid inside, and when the temperature inside the first case (201) rises, the volume of the liquid expands, thereby breaking the glass bulb. When the glass bulb is broken, the first side trigger member (244) may detach from the first side discharge port (243). The broken glass bulb may fall downward due to gravity. As the glass bulb is broken, the first internal space (241a) and the second internal space (241b) may be connected.

[0113] For example, the first side trigger member (244) may include a melting member. The melting member may include a metal material that can melt at a low temperature. For example, the melting member may be a part such as a fusible link.

[0114] When the temperature inside the first case (201) rises, the melting member may melt. When the melting member melts, the first side trigger member (244) may detach from the first side discharge port (243). The melted melting member may fall downward due to gravity. As the melting member melts, the first internal space (241a) and the second internal space (241b) may be connected.

[0115] The first side cover (240) may include a first side partition (242). The first side partition (242) may be located inside the first side body (241). The first side partition (242) may partition the first internal space (241a) and the second internal space (241b). The first side partition (242) may extend along the left-right direction or the Y-axis direction. A first side discharge port (243) may be formed in the first side partition (242). The first side partition (242) and the first side trigger member (244) may partition the first internal space (241a) and the second internal space (241b).

[0116] The density of the first substance (410) can be configured to be higher than the density of the second substance (420). As a result, when the first side discharge port (243) is opened, the first substance (410) can easily move downward, and the reaction between the first substance (410) and the second substance (420) can be promoted.

[0117] The first side discharge port (243) may be provided in multiple numbers. The first side trigger member (244) may be provided in multiple numbers. The first side trigger member (244) may be arranged to correspond one-to-one with the first side discharge port (243).

[0118] When a thermal event occurs, a plurality of first side discharge ports (243) may be opened. Some of the plurality of first side discharge ports (243) may discharge a third substance (430). Some of the plurality of first side discharge ports (243) may function as passages for air to enter.

[0119] FIG. 16 is a diagram showing the cross-sectional configuration along the cutting line B-B' of FIG. 3. FIG. 17 is a diagram showing the change in FIG. 16 when a thermal event occurs.

[0120] Referring to FIGS. 16 and 17, when a thermal event occurs, the first top trigger member (210a4) of the first top cover (210a) may be damaged. Additionally, the first side trigger member (244) of the first side cover (240) may be damaged.

[0121] The third material (430) can be discharged from the first top discharge port (210a3) of the first top cover (210a). The third material (430) can fill the space between the battery cell (220) and the first top cover (210a). The third material (430) can be discharged from the first side discharge port (243) of the first side cover (240). The third material (430) can fill the space between the first side cover (240) and the battery cell (220).

[0122] The third material (430) can fill the interior of the first case (201). As a result, the propagation of venting gas or particles can be blocked, and the propagation of thermal events can be suppressed.

[0123] FIG. 18 is a drawing showing a partial configuration of the second top cover (150) of FIG. 2. FIG. 19 is a drawing showing the second top cover (150) of FIG. 2. FIG. 20 is a drawing showing a cross-sectional configuration along the cutting line H-H' of FIG. 19. FIG. 21 is a drawing showing a cross-sectional configuration along the cutting line I-I' of FIG. 19. FIG. 22 is a drawing showing a cross-sectional configuration along the cutting line J-J' of FIG. 19.

[0124] Referring to FIGS. 1, FIGS. 2 and FIGS. 18 through 22, the second battery assembly (1000) may include a second case (100). The second case (100) may have a rectangular shape. The second case (100) may form the exterior of the second battery assembly (1000). The second case (100) may provide space inside.

[0125] The battery cell (220) may be located inside the second case (100). The second battery assembly (1000) may include a plurality of battery cells (220).

[0126] The second case (100) may include a cover. The cover may be provided in multiple numbers. The second case (100) may include a second top cover (150). The second top cover (150) may have a rectangular shape. The second top cover (150) may form the exterior of the second battery assembly (1000).

[0127] The second top cover (150) may include a second top body (151). The second top body (151) may provide an internal space. The second top body (151) may provide a first internal space (151a) and a second internal space (151b). The first internal space (151a) and the second internal space (151b) may be arranged along the front-rear direction or the X-axis direction. The first internal space (151a) and the second internal space (151b) may be partitioned.

[0128] The second tower body (151) may be provided with a second tower discharge port (153). The second tower discharge port (153) may be located between the first internal space (151a) and the second internal space (151b). The second tower discharge port (153) may connect the first internal space (151a) and the second internal space (151b). The second tower discharge port (153) may be formed toward the interior of the second case (100).

[0129] The second top cover (150) may include a second top trigger member (154). The second top trigger member (154) may be inserted into the second top discharge port (153). The second top trigger member (154) may cover the second top discharge port (153). The second top trigger member (154) may partition the first internal space (151a) and the second internal space (151b).

[0130] The first material (410) may be placed in the first internal space (151a). The first material (410) may be accommodated in the first internal space (151a). The second material (420) may be placed in the second internal space (151b). The second material (420) may be accommodated in the second internal space (151b).

[0131] When a thermal event occurs, the first substance (410) and the second substance (420) may be mixed. The first substance (410) and the second substance (420) may chemically react. The first substance (410) and the second substance (420) may react to produce a third substance (430). The third substance (430) may be a substance with a very large volume. The third substance (430) may be a foam material.

[0132] When a thermal event occurs, the third material (430) can fill the interior of the second case (100). The third material (430) can be expanded to surround the battery cell (220). The third material (430) can block the propagation of particles such as venting gas or flammable particles. The third material (430) can prevent the propagation of the thermal event.

[0133] Referring to FIGS. 1, FIGS. 2 and FIGS. 18 through 22, the second top trigger member (154) may be configured to be damaged upon the occurrence of a thermal event. Venting gas or particles emitted from the battery cell (220) upon the occurrence of a thermal event may damage the second top trigger member (154). When the second top trigger member (154) is damaged, the first internal space (151a) and the second internal space (151b) may be connected. As the first internal space (151a) and the second internal space (151b) are connected, the first material (410) and the second material (420) may react. As the first internal space (151a) and the second internal space (151b) are connected, a third material (430) may be generated. The third substance (430) can be introduced into the interior of the second case (100) along the second tower discharge port (153).

[0134] For example, the second tower trigger member (154) may include a glass bulb. The glass bulb may be configured to break above a certain temperature. For example, the glass bulb may contain liquid inside, and when the temperature inside the second case (100) rises, the volume of the liquid expands, thereby destroying the glass bulb. When the glass bulb is destroyed, the second tower trigger member (154) may detach from the second tower discharge port (153). The destroyed glass bulb may fall downward due to gravity. As the glass bulb is destroyed, the first internal space (151a) and the second internal space (151b) may be connected.

[0135] For example, the second top trigger member (154) may include a melting member. The melting member may include a metal material that can melt at a low temperature. For example, the melting member may be a part such as a fusible link.

[0136] When the temperature inside the second case (100) rises, the melting member may melt. When the melting member melts, the second tower trigger member (154) may detach from the second tower discharge port (153). The melted melting member may fall downward due to gravity. As the melting member melts, the first internal space (151a) and the second internal space (151b) may be connected.

[0137] The second top cover (150) may include a second top partition (152). The second top partition (152) may be located inside the second top body (151). The second top partition (152) may partition the first internal space (151a) and the second internal space (151b). The second top partition (152) may extend along the left-right direction or the Y-axis direction. A second top discharge port (153) may be formed in the second top partition (152). The second top partition (152) and the second top trigger member (154) may partition the first internal space (151a) and the second internal space (151b).

[0138] The second tower discharge port (153) may be provided in multiple numbers. The second tower trigger member (154) may be provided in multiple numbers. The second tower trigger member (154) may be arranged to correspond one-to-one with the second tower discharge port (153).

[0139] When a thermal event occurs, a plurality of second tower discharge ports (153) may be opened. Some of the plurality of second tower discharge ports (153) may discharge a third substance (430). Some of the plurality of second tower discharge ports (153) may function as passages for air to enter.

[0140] The second case (100) may include a second base plate (110). The second case (100) may include a second side cover (120). The second side cover (120) may be provided as a pair. A pair of second side covers (120) may be fastened, coupled, fixed, or attached to the upper surface of the second base plate (110).

[0141] The second battery assembly (1000) may include a plurality of first battery assemblies (200). The plurality of first battery assemblies (200) may be located inside the second case (100). The plurality of first battery assemblies (200) may be fastened, coupled, fixed, or attached to the upper surface of the second base plate (110).

[0142] A plurality of battery cells (220) or a plurality of first battery assemblies (200) may be disposed between the second base plate (110) and the second top cover (150). A plurality of battery cells (220) or a plurality of first battery assemblies (200) may be located between a pair of second side covers (120).

[0143] The second battery assembly (1000) 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 the second base plate (110). The partition wall (300) may partition the internal space of the second case (100). The first battery assembly (200) may be located in the space partitioned by the partition wall (300).

[0144] The first internal space (151a) may be provided in multiple numbers. The multiple first internal spaces (151a) may be arranged to correspond one-to-one with the first battery assembly (200). The second internal space (151b) may be provided in multiple numbers. The multiple second internal spaces (151b) may be arranged to correspond one-to-one with the first battery assembly (200).

[0145] FIG. 23 is a diagram showing the change in FIG. 22 when a thermal event occurs. Referring to FIG. 22 and FIG. 23, when a thermal event occurs, the second tower trigger member (154) may be damaged and the second tower discharge port (153) may be opened. The first material (410) and the second material (420) may react to produce a third material (430). The third material (430) may be discharged in a downward direction or along the -Z axis direction.

[0146] FIG. 24 is a drawing showing a partial configuration of the second side cover (120) of FIG. 2. FIG. 25 is a drawing showing the second side cover (120) of FIG. 2. FIG. 26 is a drawing showing a cross-sectional configuration along the cutting line K-K' of FIG. 25. FIG. 27 is a drawing showing a cross-sectional configuration along the cutting line L-L' of FIG. 25. FIG. 28 is a drawing showing the change of FIG. 27 when a thermal event occurs.

[0147] Referring to FIGS. 1, FIGS. 2 and FIGS. 24 through 28, the second case (100) may include a second side cover (120). The second side cover (120) may have a rectangular shape. The second side cover (120) may form the exterior of the second battery assembly (1000). The second side cover (120) may be provided as a pair. The second side cover (120) may be provided as a front side second side cover (120) and a rear side second side cover (120).

[0148] The second side cover (120) may be fastened, coupled, fixed, or attached to the second top cover (150). The second side cover (120) may be fastened, coupled, fixed, or attached to the second base plate (110).

[0149] The front side second side cover (120) and the rear side second side cover (120) may have a symmetrical structure. Below, the description will be based on the rear side second side cover (120).

[0150] The second side cover (120) may include a second side body (121). The second side body (121) may provide an internal space. The second side body (121) may provide a first internal space (121a) and a second internal space (121b). The first internal space (121a) and the second internal space (121b) may be arranged along the vertical direction or the Z-axis direction. The first internal space (121a) may be located above the second internal space (121b). The first internal space (121a) and the second internal space (121b) may be partitioned.

[0151] The second side body (121) may be provided with a second side discharge port (123). The second side discharge port (123) may be located between the first internal space (121a) and the second internal space (121b). The second side discharge port (123) may connect the first internal space (121a) and the second internal space (121b). The second side discharge port (123) may be formed facing the interior of the second case (100).

[0152] The second side cover (120) may include a second side trigger member (124). The second side trigger member (124) may be inserted into the second side discharge port (123). The second side trigger member (124) may cover the second side discharge port (123). The second side trigger member (124) may partition the first internal space (121a) and the second internal space (121b).

[0153] The first material (410) may be placed in the first internal space (121a). The first material (410) may be accommodated in the first internal space (121a). The second material (420) may be placed in the second internal space (121b). The second material (420) may be accommodated in the second internal space (121b).

[0154] When a thermal event occurs, the first substance (410) and the second substance (420) may be mixed. The first substance (410) and the second substance (420) may chemically react. The first substance (410) and the second substance (420) may react to produce a third substance (430). The third substance (430) may be a substance with a very large volume. The third substance (430) may be a foam material.

[0155] When a thermal event occurs, the third material (430) can fill the interior of the second case (100). The third material (430) can be expanded to surround the battery cell (220). The third material (430) can block the propagation of particles such as venting gas or flammable particles. The third material (430) can prevent the propagation of the thermal event.

[0156] The second side trigger member (124) may be configured to be damaged upon the occurrence of a thermal event. Venting gas or particles emitted from the battery cell (220) upon the occurrence of a thermal event may damage the second side trigger member (124). When the second side trigger member (124) is damaged, the first internal space (121a) and the second internal space (121b) may be connected. As the first internal space (121a) and the second internal space (121b) are connected, the first material (410) and the second material (420) may react. As the first internal space (121a) and the second internal space (121b) are connected, a third material (430) may be generated. The third material (430) may flow into the interior of the second case (100) along the second side discharge port (123).

[0157] For example, the second side trigger member (124) may include a glass bulb. The glass bulb may be configured to break above a certain temperature. For example, the glass bulb may contain liquid inside, and when the temperature inside the second case (100) rises, the volume of the liquid expands, thereby breaking the glass bulb. When the glass bulb is broken, the second side trigger member (124) may detach from the second side discharge port (123). The broken glass bulb may fall downward due to gravity. As the glass bulb is broken, the first internal space (121a) and the second internal space (121b) may be connected.

[0158] For example, the second side trigger member (124) may include a melting member. The melting member may include a metal material that can melt at a low temperature. For example, the melting member may be a part such as a fusible link.

[0159] When the temperature inside the second case (100) rises, the melting member may melt. When the melting member melts, the second side trigger member (124) may detach from the second side discharge port (123). The melted melting member may fall downward due to gravity. As the melting member melts, the first internal space (121a) and the second internal space (121b) may be connected.

[0160] The second side cover (120) may include a second side partition (122). The second side partition (122) may be located inside the second side body (121). The second side partition (122) may partition the first internal space (121a) and the second internal space (121b). The second side partition (122) may extend along the left-right direction or the Y-axis direction. A second side discharge port (123) may be formed in the second side partition (122). The second side partition (122) and the second side trigger member (124) may partition the first internal space (121a) and the second internal space (121b).

[0161] The density of the first substance (410) can be configured to be higher than the density of the second substance (420). As a result, when the second side discharge port (123) is opened, the first substance (410) can easily move downward, and the reaction between the first substance (410) and the second substance (420) can be promoted.

[0162] The second side discharge port (123) may be provided in multiple numbers. The second side trigger member (124) may be provided in multiple numbers. The second side trigger member (124) may be arranged to correspond one-to-one with the second side discharge port (123).

[0163] When a thermal event occurs, a plurality of second side discharge ports (123) may be opened. Some of the plurality of second side discharge ports (123) may discharge a third substance (430). Some of the plurality of second side discharge ports (123) may function as passages for air to enter.

[0164] The second case (100) may include a side wall (130). The side wall (130) may have a rectangular shape. The side wall (130) may form the exterior of the second battery assembly (1000). The side wall (130) may be provided as a pair. The side wall (130) may include a left side wall (130) and a right side wall (130).

[0165] The side wall (130) may be fastened, coupled, fixed, or attached to the second top cover (150). The side wall (130) may be fastened, coupled, fixed, or attached to the second base plate (110). The side wall (130) may be fastened, coupled, fixed, or attached to the second side cover (120).

[0166] The second battery assembly (1000) may include a venting device (500). The venting device (500) may be installed on the side wall (130). For example, the venting device (500) may be installed on the right side wall (130). 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 second case (100) increases. Additionally, the venting device (500) may block external air from entering the second case (100). The venting device (500) may be provided in multiple units.

[0167] FIG. 29 is a diagram showing a cross-sectional configuration along the cutting line A-A' of FIG. 1. FIG. 30 is a diagram showing the change in FIG. 29 when a thermal event occurs.

[0168] Referring to FIGS. 29 and 30, when a thermal event occurs, the second top trigger member (154) of the second top cover (150) may be damaged. Additionally, the second side trigger member (124) of the second side cover (120) may be damaged.

[0169] The third material (430) can be discharged from the second top discharge port (153) of the second top cover (150). The third material (430) can fill the space between the first battery assembly (200) and the second top cover (150). The third material (430) can be discharged from the second side discharge port (123) of the second side cover (120). The third material (430) can fill the space between the second side cover (120) and the first battery assembly (200).

[0170] The third material (430) can fill the interior of the second case (100). As a result, the propagation of venting gas or particles can be blocked, and the propagation of thermal events can be suppressed.

[0171] When a thermal event occurs, the first top trigger member (210a4) of the first top cover (210a) may be damaged. Additionally, the first side trigger member (244) of the first side cover (240) may be damaged.

[0172] The third material (430) can be discharged from the first top discharge port (210a3) of the first top cover (210a). The third material (430) can fill the space between the battery cell (220) and the first top cover (210a). The third material (430) can be discharged from the first side discharge port (243) of the first side cover (240). The third material (430) can fill the space between the first side cover (240) and the battery cell (220).

[0173] The third material (430) can fill the interior of the first case (201). As a result, the propagation of venting gas or particles can be blocked, and the propagation of thermal events can be suppressed.

[0174] The first battery assembly (200) according to the present invention may be applied to a vehicle such as an electric vehicle or a hybrid vehicle. The vehicle according to the present invention may further include various other components included in the vehicle in addition to the first battery assembly (200). For example, the vehicle according to the present invention may further include a vehicle body, a motor, a control device such as an ECU (electronic control unit), etc.

[0175] The second battery assembly (1000) according to the present invention may be applied to a vehicle such as an electric vehicle or a hybrid vehicle. The vehicle according to the present invention may further include various other components included in the vehicle in addition to the second battery assembly (1000). For example, the vehicle according to the present invention may further include a vehicle body, a motor, a control device such as an ECU (electronic control unit), etc.

[0176] 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 that provides internal space and is equipped with a cover; and, It includes a battery cell located inside the above case, and The above cover is: A body having a first internal space and a second internal space, and a discharge port located between the first internal space and the second internal space; A first material disposed in the first internal space; A second material disposed in the second internal space; and, A battery assembly comprising a trigger member that covers the discharge port and partitions the first internal space and the second internal space.

2. In Paragraph 1, The above trigger member is, A battery assembly configured to be damaged upon the occurrence of a thermal event.

3. In Paragraph 1, The above trigger member is, Battery assembly including a glass bulb.

4. In Paragraph 1, The above trigger member is, Battery assembly including a melting member.

5. In Paragraph 1, The above trigger member is, A battery assembly provided in multiple numbers.

6. In Paragraph 1, A battery assembly configured such that the first material and the second material react to expand.

7. In Paragraph 1, The above discharge port is, A battery assembly formed toward the interior of the above case.

8. In Paragraph 1, The above discharge port is, A battery assembly connecting the first internal space and the second internal space.

9. In Paragraph 1, The above cover is, A battery assembly further comprising a partition dividing the first internal space and the second internal space.

10. In Paragraph 1, The above case is, It includes a base plate positioned below the battery cell, and The above cover is, A battery assembly that is a side cover installed on the upper surface of the base plate.

11. In Paragraph 10, The above-mentioned first internal space is, Located above the second internal space, The density of the first substance is, A battery assembly configured to have a density higher than that of the second material.

12. In Paragraph 1, The above case is, It includes a base plate positioned below the battery cell, and The above cover is, A battery assembly that is a top cover placed on top of the battery cell.

13. An automobile comprising a battery assembly according to any one of claims 1 to 12.

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