Battery pack

Abstract

A battery pack is disclosed. The battery pack according to an embodiment of the present invention may comprise: a case providing a space therein and having a base plate; a battery module installed on the base plate and including a rear end cover having a venting hole; a first venting channel covering the rear end cover and having a first inlet hole and a first outlet hole communicating with the venting hole; and a second venting channel which covers one side surface of the battery module, is coupled to the first venting channel, and has a second inlet hole and a second outlet hole communicating with the first outlet hole.

Description

battery pack

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

[0002] This application claims priority to Korean Patent Application No. 10-2024-0091695, filed on July 11, 2024, the entire disclosure of which is incorporated herein by reference.

[0003] As demand for portable electronic devices such as smartphones, tablet PCs, and smartwatches increases significantly and electric vehicles become increasingly widespread, research is actively being conducted on the batteries used in these devices, especially secondary batteries that can be repeatedly charged and discharged.

[0004] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving attention for their advantages of being able to charge and discharge freely, having a very low self-discharge rate, and having a high energy density, as they have almost no memory effect compared to nickel-based secondary batteries.

[0005] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. Lithium secondary batteries comprise an electrode assembly comprising positive and negative plates coated with the positive and negative electrode active materials, respectively, with a separator interposed between them, and an outer case, i.e., a battery case, that seals and encloses the electrode assembly together with an electrolyte.

[0006] In general, lithium secondary batteries can be classified into can-type secondary batteries in which the electrode assembly is built into a metal can and pouch-type secondary batteries in which the electrode assembly is built into a pouch of an aluminum laminate sheet, depending on the shape of the outer packaging material.

[0007] Recently, secondary batteries are widely used for power and energy storage not only in small devices such as portable electronic devices but also in medium- to large-sized devices such as electric vehicles and energy storage systems (ESS). Multiple secondary batteries can be electrically connected and housed within a module case to form a single battery module. Each secondary battery within a 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, each of which contains multiple battery cells, it may be vulnerable to a thermal chain reaction between battery modules or between battery cells. For example, if an event such as thermal runaway occurs within a single battery module, the propagation of this thermal runaway to other battery modules or cells must be prevented. If the propagation of thermal runaway between battery modules or cells is not properly prevented, an event occurring in a specific battery module or battery cell may trigger a chain reaction of thermal reactions in other battery modules or cells, potentially causing an explosion or fire, or potentially increasing its scale.

[0009] In particular, if an event such as thermal runaway occurs in a single battery module, gas or flames may be randomly discharged to the outside. If the discharge of gas or flames is not properly controlled, there is a risk that the gas or flames may be discharged toward other battery modules, causing a thermal chain reaction in the other battery modules. In particular, the front side of the battery module may have module terminals, which may be configured to electrically connect to other battery modules or battery packs, such as module bus bars. Therefore, if flames are discharged toward the front side of such a battery module, the module terminals may be damaged within the battery pack, causing an electrical short. Furthermore, since other battery modules may be present at the front side of the battery module, if flames are discharged toward the front side of a specific battery module, the discharged flames may easily spread to other battery modules, potentially causing a fire to spread between battery modules.

[0010] Failure to properly control thermal transfer between battery modules or battery cells can lead to a sudden voltage drop in the battery module or battery pack. This can lead to a sudden shutdown of the device equipped with the battery module or battery pack, resulting in unexpected damage. For example, if a voltage drop in a battery pack occurs suddenly while an electric vehicle is in operation, there is no time to move the vehicle to a safe location.

[0011] Moreover, if thermal propagation between battery modules or cells fails to be properly controlled, resulting in a sudden fire or explosion, there is a high possibility of causing casualties. For example, if thermal runaway occurs in an electric vehicle, if a certain amount of time is not allowed for a full-blown fire to develop, occupants may not be able to escape safely.

[0012] Accordingly, the present invention has been created to solve the above problems, and its purpose is to provide a battery pack having an improved structure so as to appropriately control the emission of flames and the like generated inside a battery module, and an automobile including the same.

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

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

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

[0016] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0017] In order to achieve the above object, according to one embodiment of the present invention, a battery pack may include: a case providing a space therein and having a base plate; a battery module including a rear end cover installed on the base plate and having a venting hole; and a first venting channel covering the rear end cover and having a first inlet hole and a first discharge hole communicating with the venting hole; and a second venting channel covering one side of the battery module, coupled with the first venting channel, and having a second inlet hole and a second discharge hole communicating with the first discharge hole.

[0018] The battery pack may further include a third venting channel having a third inlet hole and a third exhaust hole coupled to the second venting channel and communicating with the second exhaust hole.

[0019] The case further includes a first partition wall that divides the internal space of the case and covers the front of the battery module, and the third venting channel can extend along the first partition wall.

[0020] The third venting channel may be coupled to the first partition wall.

[0021] The case includes a side wall installed on the base plate, and the third exhaust hole of the third venting channel can be communicated with the side wall.

[0022] The battery pack further includes a venting device installed in the case, and the third discharge hole of the third venting channel can be communicated with the venting device.

[0023] The battery pack further includes a second partition wall that divides the internal space of the case and extends in the front-rear direction, and the second venting channel can be coupled to the second partition wall.

[0024] The above battery pack may further include a refractory member positioned between the first discharge hole and the second inlet hole.

[0025] The above refractory member may have a separation line.

[0026] The case includes a pack cover positioned above the battery module, and the second venting channel can be positioned between the battery module and the pack cover.

[0027] The above first venting channel can be fastened to the rear end cover.

[0028] The above battery module may further include a power terminal protruding forward.

[0029] A vehicle according to one aspect of the present invention comprises a battery pack of the present invention.

[0030] 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.

[0031] According to at least one of the embodiments of the present invention, damage to the exterior of a battery pack can be prevented even if a thermal event occurs.

[0032] According to at least one of the embodiments of the present invention, the electrical safety of a battery pack can be improved.

[0033] According to at least one of the embodiments of the present invention, heat transmission between battery modules can be suppressed when a thermal event occurs.

[0034] The following drawings attached to this specification illustrate preferred embodiments of the present invention, and together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0035] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0036] Figures 2 and 3 are drawings showing some of the components of the battery pack of Figure 1 in isolation.

[0037] Figure 4 is a drawing showing a modified embodiment of Figure 3.

[0038] Figure 5 is a drawing showing the battery module of Figure 3.

[0039] Figure 6 is a diagram showing a partial configuration of the battery module of Figure 5.

[0040] Figure 7 is an enlarged view of a portion of the configuration of Figure 6.

[0041] Figure 8 is a drawing showing the configuration of Figure 7 in a different direction.

[0042] Fig. 9 is a drawing showing a modified embodiment of Fig. 8.

[0043] Figures 10 and 11 are drawings showing the first venting channel of Figure 3.

[0044] Fig. 12 is a drawing showing the second venting channel of Fig. 3.

[0045] Fig. 13 is a drawing showing a cross-sectional configuration along the cutting line E-E' of Fig. 12.

[0046] Fig. 14 is a drawing showing a cross-sectional configuration along the cutting line F-F' of Fig. 12.

[0047] Fig. 15 is a drawing showing the third venting channel of Fig. 3.

[0048] Figure 16 is a drawing showing the combination of a battery module, a first venting channel, a second venting channel, and a third venting channel.

[0049] Fig. 17 is a drawing showing a modified embodiment of Fig. 16.

[0050] Fig. 18 is a drawing showing a cross-sectional configuration along the cutting line C-C' of Fig. 2.

[0051] Fig. 19 is a drawing showing a cross-sectional configuration along the cutting line A-A' of Fig. 2.

[0052] Figure 20 is a diagram showing the change in Figure 19 when a thermal event occurs.

[0053] Fig. 21 is a drawing showing a cross-sectional configuration along the cutting line B-B' of Fig. 2.

[0054] Fig. 22 is a drawing showing a cross-sectional configuration along the cutting line D-D' of Fig. 2.

[0055] Figure 23 is a diagram showing the movement of venting gas.

[0056] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, it should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. Based on the principle that the inventor can appropriately define the concepts of terms to best explain his or her invention, they should be interpreted in a way that aligns with the technical spirit of the present invention.

[0057] Accordingly, the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical ideas of the present invention, and it should be understood that there may be various equivalents and modified examples that can replace them at the time of filing this application.

[0058] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention. FIG. 2 and FIG. 3 are separate drawings showing some components of the battery pack of FIG. 1.

[0059] Referring to FIGS. 1 to 3, a battery pack according to an embodiment of the present invention may include a case (100). The case (100) may have a rectangular parallelepiped shape. The case (100) may provide a space therein. The case (100) may be provided with a base plate (110). The base plate (110) may have a square plate shape.

[0060] A battery pack according to an embodiment of the present invention may include a battery module (200). The battery module (200) may be located inside a case (100). The battery module (200) may be installed on a base plate (110). A plurality of battery modules (200) may be provided. The battery module (200) may include a rear end cover (242). The rear end cover (242) may be provided with a third venting hole (242a, see FIG. 7). When a thermal event occurs inside the battery module (200), venting gas (G) may be discharged to the outside of the battery module (200) through the third venting hole (242a).

[0061] A battery pack according to an embodiment of the present invention may include a first venting channel (400). The first venting channel (400) may provide a space therein. The first venting channel (400) may be located at the rear of the rear end cover (242). The first venting channel (400) may face the rear end cover (242). The first venting channel (400) may cover the rear end cover (242). The first venting channel (400) may be fastened, coupled, attached, or fixed to the rear end cover (242). The first venting channel (400) may be fastened, coupled, attached, or fixed to the battery module (200). The first venting channel (400) may have a first inlet hole (411) communicating with a third venting hole (242a). Additionally, the first venting channel (400) may have a first discharge hole (412).

[0062] A battery pack according to an embodiment of the present invention may include a second venting channel (700). The second venting channel (700) may provide a space therein. The second venting channel (700) may cover one surface of the battery module (200). For example, the second venting channel (700) may cover at least one of the top surface or the side surface of the battery module (200). The second venting channel (700) may be fastened, coupled, attached, or fixed to the first venting channel (400). The second venting channel (700) may be fastened, coupled, attached, or fixed to the battery module (200). The second venting channel (700) may have a second inlet hole (711) communicating with the first discharge hole (412). In addition, the second venting channel (700) may have a second discharge hole (712).

[0063] When a thermal event occurs inside the battery module (200), venting gas (G) or ignitable particles (F) can be discharged through the third venting hole (242a) of the rear end cover (242). The venting gas (G) or ignitable particles (F) can be introduced into the first inlet hole (411) of the first venting channel (400) and can flow inside the first venting channel (400). The venting gas (G) or ignitable particles (F) can be discharged through the first discharge hole (412) of the first venting channel (400) and can be introduced into the second venting channel (700) through the second inlet hole (711) of the second venting channel (700). The venting gas (G) or ignitable particles (F) can flow inside the second venting channel (700). The venting gas (G) or ignitable particles (F) can be discharged through the second discharge hole (712) of the second venting channel (700). The venting direction of the venting gas (G) or ignitable particles (F) can be easily controlled due to the first venting channel (400) and the second venting channel (700). The venting gas (G) or ignitable particles (F) can flow through the first venting channel (400) and the second venting channel (700) and the temperature and pressure can be lowered. The thermal safety of the battery pack can be improved by the first venting channel (400) and the second venting channel (700).

[0064] Referring to FIGS. 1 to 3, a case (100) may provide an internal space. The case (100) may include a base plate (110), a side wall (120), and a pack cover (150). The base plate (110) may have a square shape. The base plate (110) may have a flat shape. The base plate (110) may form the exterior of the battery pack. The base plate (110) may provide an internal space of the battery pack.

[0065] 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. The pack cover (150) may cover the internal space of the battery pack.

[0066] The partition wall (300) may include a first partition wall (320) and a second partition wall (310). A plurality of partition walls (300) may be provided. The partition wall (300) may be installed, fastened, fixed, joined, or attached to the upper surface of the base plate (110). The partition wall (300) may partition the internal space of the battery pack. A battery module (200) or a battery cell (220) may be positioned in the space partitioned by the partition wall (300).

[0067] The venting device (500) may be installed on the side wall (120). For example, the venting device (500) may be installed on the front 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. In addition, the venting device (500) may block external air from flowing into the case (100). The venting device (500) may be provided in multiple numbers.

[0068] A plurality of first venting channels (400) may be provided. The plurality of first venting channels (400) may be provided in one-to-one correspondence with a plurality of battery modules (200). A plurality of second venting channels (700) may be provided. The plurality of second venting channels (700) may be provided in one-to-one correspondence with a plurality of first venting channels (400). The plurality of second venting channels (700) may be provided in one-to-one correspondence with a plurality of battery modules (200).

[0069] Referring to FIGS. 1 to 3, the second venting channel (700) may be positioned between the pack cover (150) and the battery module (200). The second venting channel (700) may prevent the pack cover (150) from being directly damaged by the venting gas (G). As a result, the venting gas (G) may be prevented from being discharged to the outside of the battery pack through the pack cover (150).

[0070] FIG. 4 is a drawing showing a modified embodiment of FIG. 3. Referring to FIG. 4, one second venting channel (700) can be combined with multiple first venting channels (400). One second venting channel (700) can correspond to multiple battery modules (200). For example, one second venting channel (700) can be combined with three first venting channels (400). Additionally, one second venting channel (700) can cover three battery modules (200).

[0071] Fig. 5 is a drawing showing the battery module of Fig. 3. Fig. 6 is a drawing showing a part of the battery module (200) of Fig. 5 in isolation. Fig. 7 is an enlarged drawing of a part of the configuration of Fig. 6. Fig. 8 is a drawing showing the configuration of Fig. 7 from a different direction.

[0072] Referring to FIGS. 5 to 8, the battery module (200) may include a module case (210). The module case (210) may have a rectangular parallelepiped shape. The module case (210) may provide a space therein. The module case (210) may include a top plate, a bottom plate, and a pair of side plates. In addition, the module case (210) may have an open front and back.

[0073] A battery cell (220) may be accommodated inside a module case (210). A plurality of battery cells (220) may be stacked along the left-right direction or the Y-axis direction. The battery cell (220) may include a receiving portion (221) having an electrode assembly, a first sealing portion (222) protruding toward the front and rear sides of the receiving portion (221), and a second sealing portion (223) protruding toward the upper side of the receiving portion (221). In addition, the battery cell (220) may include an electrode lead (224) protruding toward the front and rear sides of the first sealing portion (222), respectively. Each battery cell (220) may extend along the front-back direction or the X-axis direction. The electrode lead (224) may protrude toward the front and rear of each battery cell (220).

[0074] 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 parallelepiped shape. The battery cell (220) may be provided in multiple numbers.

[0075] The pad (250) may be placed between a plurality of battery cells (220). The pad (250) may be placed between at least some of the battery cells (220) and / or on the periphery 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.

[0076] These pads (250) may be provided with an elastic material to enable swelling absorption of the battery cells (220). For example, the pads (250) may be composed 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 fire-retardant material such as silicone or mica.

[0077] A front busbar frame assembly (231) may be provided at the front of a plurality of battery cells (220). The front busbar frame assembly (231) may be electrically connected to front-side electrode leads (224) of the plurality of battery cells (220).

[0078] A 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 rear-side electrode leads (224) of the plurality of battery cells (220).

[0079] The front end cover (241) can be coupled 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 square shape.

[0080] The rear end cover (242) can be coupled 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.

[0081] The front insulation cover (261) can be positioned between the front end cover (241) and the front busbar frame assembly (231). The front insulation cover (261) can electrically insulate the front busbar frame assembly (231) and the front end cover (241).

[0082] 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).

[0083] The rear busbar frame assembly (232) may include a frame (232a) and a busbar (232b). The busbar (232b) may be installed in the frame (232a). The busbar (232b) may be electrically connected to rear-side electrode leads (224) of a plurality of battery cells (220). The busbar (232b) may be provided in plurality. The plurality of busbars (232b) may be arranged in the left-right direction or along the Y-axis direction. In addition, the frame (232a) may be provided with a first venting hole (232c). The first venting hole (232c) may be a through hole. The first venting hole (232c) may face the first sealing portion (222) on the rear side of the battery cell (220). The first venting hole (232c) may be provided in plurality. Some of the plurality of first venting holes (232c) may be placed between two adjacent bus bars (232b).

[0084] Referring to FIGS. 3 and 5 to 8, the battery module (200) may include a power terminal (231a) protruding forward. The power terminal (231a) may be provided on the front busbar frame assembly (231). The power terminal (231a) may protrude from the front busbar assembly (231). The power terminals (231a) may be provided in pairs. The power terminals (231a) may be exposed to the outside of the battery module (200).

[0085] The power terminal (231a) can be electrically connected to the power terminal (231a) of the neighboring battery module (200). The inter-bus bar (600) can electrically connect the neighboring battery modules (200).

[0086] The front side of the battery module (200) may be configured with major components such as a power terminal (231a), a control terminal, and an inter-bus bar (600). By discharging venting gas (G) and flammable particles (F) 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), thermal event propagation to neighboring battery modules (200) can be suppressed.

[0087] Referring to FIGS. 5 to 8, the rear insulating cover (262) may have a second venting hole (262a). The second venting hole (262a) may be a through hole. The second venting hole (262a) may face the rear busbar frame assembly (232) or the first venting hole (232c). The second venting hole (262a) may be in communication with the first venting hole (232c). The second venting holes (262a) may be provided in multiple numbers. The plurality of second venting holes (262a) may be in communication with the plurality of first venting holes (232c).

[0088] Referring to FIGS. 5 to 8, the battery module (200) may further include a refractory sheet (270). The refractory sheet (270) may include a material having high heat resistance or fire resistance. The refractory sheet (270) may be positioned on the inner side of the rear end cover (242). The refractory sheet (270) may be positioned between the rear end cover (242) and the rear insulating cover (262). The refractory sheet (270) may be fixed between the rear end cover (242) and the rear insulating cover (262).

[0089] The refractory sheet (270) may be positioned between the third venting hole (242a) and the second venting hole (262a). The refractory sheet (270) may cover a plurality of third venting holes (242a) and a plurality of second venting holes (262a).

[0090] When a thermal event occurs, the internal pressure of the module case (210) may increase due to the venting gas (G) and the ignitable particles (F). This may cause a portion of the refractory sheet (270) to rupture. In addition, due to the rupture of the refractory sheet (270), some of the second venting holes (262a) and some of the third venting holes (242a) may be connected, and the venting gas (G) and the ignitable particles (F) may be discharged. In addition, the unruptured portion of the refractory sheet (270) may still cover the remaining second venting holes (262a) and the remaining third venting holes (242a). This may prevent the venting gas (G) and the ignitable particles (F) discharged to the outside of the battery module (200) from flowing into the inside of the battery module (200).

[0091] Fig. 9 is a drawing showing a modified embodiment of Fig. 8. Referring to Fig. 9, the refractory sheet (270) may have a separation line (271). The separation line (271, score line) may be used as a term including and collectively referring to a perforated line (271), a notching line (271), a cutting line (271), a shredding line (271), a tear line (271), or a separation line (271). The separation line (271) may be configured to be easily separated by pressure applied to the refractory sheet (270).

[0092] FIG. 10 and FIG. 11 are drawings illustrating the first venting channel (400) of FIG. 3. Referring to FIG. 10 and FIG. 11, the first venting channel (400) may have a rectangular parallelepiped shape. The first venting channel (400) may include a first body (410). The first body (410) may form an outer appearance of the first venting channel (400). The first body (410) may provide a space therein. The first venting channel (400) may be formed in the first body (410) and may have a first inlet hole (411) that communicates with a third venting hole (242a). The third venting hole (242a) and the first inlet hole (411) may be arranged to face each other. The first venting channel (400) may have a first discharge hole (412) formed on the upper surface of the first body (410).

[0093] The first venting channel (400) may include a first partition (420). The first partition (420) may partition the interior of the first body (410). The first partition (420) may extend in the vertical direction or along the Z-axis direction. The first partition (420) may be provided in multiple numbers. The plurality of first partitions (420) may be arranged along the left-right direction or the Y-axis direction. In this case, each partitioned space may be referred to as a first venting space (VS1).

[0094] Due to the presence of multiple first venting spaces (VS1), the range of space through which venting gas (G) and ignitable particles (F) can propagate can be further limited. This can further suppress the propagation of thermal events.

[0095] Fig. 12 is a drawing showing the second venting channel (700) of Fig. 3. Fig. 13 is a drawing showing a cross-sectional configuration taken along the cutting line E-E' of Fig. 12. Fig. 14 is a drawing showing a cross-sectional configuration taken along the cutting line F-F' of Fig. 12. Referring to Figs. 12 to 14, the second venting channel (700) may have a rectangular parallelepiped shape. The second venting channel (700) may include a second body (710). The second body (710) may form the exterior of the second venting channel (700). The second body (710) may provide a space therein. The second venting channel (700) may be formed in the second body (710) and may have a second inlet hole (711) communicating with the first discharge hole (412). The first discharge hole (412) and the second inlet hole (711) may be arranged to face each other. The second venting channel (700) may have a second discharge hole (712) formed on the front surface of the second body (710).

[0096] The second venting channel (700) may include a second partition (720). The second partition (720) may partition the interior of the second body (710). The second partition (720) may extend in the front-back direction or along the X-axis direction. The second partition (720) may be provided in multiple numbers. The multiple second partitions (720) may be arranged along the left-right direction or the Y-axis direction. In this case, each partitioned space may be referred to as a second venting space (VS2).

[0097] Due to the presence of multiple secondary venting spaces (VS2), the range of space through which venting gas (G) and ignitable particles (F) can propagate can be further limited. This can further suppress the propagation of thermal events.

[0098] FIG. 15 is a drawing illustrating a third venting channel (800) of FIG. 3. Referring to FIG. 15, the third venting channel (800) may have a rectangular parallelepiped shape. The third venting channel (800) may include a third body (810). The third body (810) may form an outer appearance of the third venting channel (800). The third body (810) may extend lengthwise in the left-right direction or the Y-axis direction. The third body (810) may provide a space inside. In this case, the inner space of the third body (810) may be referred to as a third venting space (VS3). The third venting channel (800) may be formed in the third body (810) and may include a third inlet hole (811) that communicates with the second discharge hole (712). The second discharge hole (712) and the third inlet hole (811) may be arranged to face each other. The third venting channel (800) may have a third discharge hole (812) formed at the left end of the third body (810). The third venting channel (800) may have a third discharge hole (812) formed at the right end of the third body (810).

[0099] FIG. 16 is a drawing showing the combination of a battery module (200), a first venting channel (400), a second venting channel (700), and a third venting channel (800). Referring to FIGS. 10 to 16, the first venting channel (400) and the second venting channel (700) may be fastened, coupled, or attached. The first venting channel (400) and the second venting channel (700) may be coupled by welding. Alternatively, the first venting channel (400) and the second venting channel (700) may be coupled by bolting. The plurality of first discharge holes (412) and the plurality of second inflow holes (711) may be arranged to correspond one-to-one. Each of the plurality of first discharge holes (412) and each of the plurality of second inflow holes (711) may be arranged to face each other. A plurality of first venting spaces (VS1) and a plurality of second venting spaces (VS2) can be arranged in one-to-one correspondence.

[0100] The refractory member (440) may be positioned between the first venting channel (400) and the second venting channel (700). The refractory member (440) may have a sheet shape. The refractory member (440) may include a material having high refractory properties. The refractory member (440) may include a material having high heat resistance. The refractory member (440) may be fastened, joined, fixed, or attached to the upper surface of the first venting channel (400). The refractory member (440) may be positioned between the first discharge hole (412) and the second inlet hole (711). The refractory member (440) may be positioned between the first venting space (VS1) and the second venting space (VS2).

[0101] When a thermal event occurs, the pressure in some of the first venting spaces (VS1) among the plurality of first venting spaces (VS1) may increase. And, due to the increased pressure, some of the refractory member (440) may rupture. By rupturing the refractory member (440), the first venting space (VS1) and the second venting space (VS2) may be connected. At this time, the refractory member (440) covering the first venting space (VS1) in which the pressure does not increase may not rupture.

[0102] Referring to FIGS. 10 to 16, the second venting channel (700) and the third venting channel (800) may be fastened, coupled, or attached. The second venting channel (700) and the third venting channel (800) may be coupled by welding. Alternatively, the second venting channel (700) and the third venting channel (800) may be coupled by bolting. The plurality of second discharge holes (712) and the plurality of third inlet holes (811) may be arranged to correspond one to one. Each of the plurality of second discharge holes (712) and each of the plurality of third inlet holes (811) may be arranged to face each other. Each of the plurality of second discharge holes (712) and each of the plurality of third inlet holes (811) may be in communication. The plurality of second venting spaces (VS2) may be in communication with the third venting space (VS3).

[0103] Referring to FIGS. 10 to 16, the first venting channel (400) may be fastened, coupled, attached, or fixed to the rear end cover (242). For example, the first venting channel (400) may be bolted to the rear end cover (242). Alternatively, the first venting channel (400) may be welded to the rear end cover (242).

[0104] Referring to FIGS. 3, 4, and 16, the third venting channel (800) may extend along the first partition wall (320). The third venting channel (800) may be positioned above the first partition wall (320). The third venting channel (800) may be fastened, joined, fixed, or attached to the top of the first partition wall (320). For example, the third venting channel (800) and the first partition wall (320) may be joined by welding. Alternatively, the third venting channel (800) and the first partition wall (320) may be joined by bolting.

[0105] Fig. 17 is a drawing showing a modified embodiment of Fig. 16. Referring to Fig. 17, the refractory member (440) may have a separation line (441). The separation line (441, score line) may be used as a term including and collectively referring to a perforated line (441), a notching line (441, notching line), a cutting line (441, cutting line), a shredding line (441, shredding line), a tear line (441), or a separation line (441, separation line). The separation line (441) may be configured to be easily separated by pressure applied to the refractory member (440). The separation line (441) may be provided for each first discharge hole (412). The separation line (441) may be provided for each second inlet hole (711). The refractory member (440) can be ruptured even under a smaller pressure by the separation line (441).

[0106] Fig. 18 is a drawing showing a cross-sectional configuration taken along the cutting line C-C' of Fig. 2. Referring to Fig. 18, the second venting channel (700) can be fastened, coupled, fixed, or attached to the second partition wall (310). For example, the second venting channel (700) and the second partition wall (310) can be fastened by welding. Alternatively, the second venting channel (700) and the second partition wall (310) can be fastened by a fastening member (S). The second venting channel (700) can be located above the second partition wall (310). The second venting channel (700) can be fastened to the upper end of the second partition wall (310).

[0107] Fig. 19 is a drawing showing a cross-sectional configuration taken along the cutting line A-A' of Fig. 2. Fig. 20 is a drawing showing a change in Fig. 19 when a thermal event occurs. Referring to Figs. 19 and 20, when a thermal event occurs in the battery cell (220), venting gas (G) or ignitable particles (F) may be discharged through the first sealing portion (222). The venting gas (G) or ignitable particles (F) may rupture the refractory sheet (270) and be discharged through the third venting hole (242a).

[0108] Venting gas (G) or ignitable particles (F) discharged through the third venting hole (242a) may flow into the first venting space (VS1) of the first venting channel (400) through the first inlet hole (411). The ignitable particles (F) may lose energy and fall down after colliding with the first body (410).

[0109] The venting gas (G) can rise upward. The venting gas (G) can rupture the refractory member (440). As a result, the first venting space (VS1) and the second venting space (VS2) can be connected. The venting gas (G) can be discharged from the first venting channel (400) through the first discharge hole (412). The venting gas (G) can be introduced into the second venting space (VS2) of the second venting channel (700) through the second inflow hole (711). The venting gas (G) can flow in the front-back direction or the X-axis direction along the second venting space (VS2).

[0110] The venting gas (G) can be discharged from the second venting channel (700) through the second discharge hole (712). The venting gas (G) can be introduced into the third venting space (VS3) of the third venting channel (800) through the third inlet hole (811).

[0111] By gathering flammable particles (F) beneath the first venting space (VS1), they can be prevented from being discharged outside the battery pack. Venting gas (G) can travel along a long path, reducing its energy and temperature. This can enhance the thermal safety of the battery pack.

[0112] Fig. 21 is a drawing showing a cross-sectional configuration taken along the cutting line B-B' of Fig. 2. Referring to Figs. 19 to 21, the venting gas (G) introduced into the third venting space (VS3) may flow back into the adjacent second venting space (VS2). The backflowing venting gas (G) may flow toward the second inflow hole (711) along the second venting space (VS2). The pressure of the backflowing venting gas (G) may be lower than the pressure of the venting gas (G) discharged in the forward direction when a thermal event occurs. At this time, the refractory member (440) may block the backflow of the venting gas (G). The refractory member (440) may be ruptured by the pressure of the venting gas (G) discharged in the forward direction when a thermal event occurs, but may not be ruptured by the pressure of the backflowing venting gas (G).

[0113] By blocking the backflow of the venting gas (G) by the refractory member (440), the venting gas (G) can be prevented from flowing into the battery module (200) and causing a thermal event to propagate.

[0114] Fig. 22 is a drawing showing a cross-sectional configuration taken along the cutting line D-D' of Fig. 2. Referring to Fig. 22, the third venting channel (800) may be in communication with the side wall (120). The side wall (120) may provide a space therein. The side wall (120) may be provided with a fourth inlet hole (121) that is in communication with the third discharge hole (812).

[0115] The venting gas (G) can be discharged from the third venting channel (800) through the third discharge hole (812). The venting gas (G) can be introduced into the interior of the side wall (120) through the fourth inlet hole (121).

[0116] The venting device (500) may be connected to the internal space of the side wall (120). Venting gas (G) introduced into the interior of the side wall (120) may be discharged to the outside of the battery pack through the venting device (500).

[0117] Fig. 23 is a diagram illustrating the movement of venting gas (G). Referring to Fig. 23, when a thermal event occurs, the venting gas (G) may flow into the third venting channel (800) through the second venting channel (700). The venting gas (G) flowing into the third venting channel (800) may flow along the left-right direction or the Y-axis direction. A portion of the venting gas (G) may move along the left-hand direction or the -Y-axis direction and be discharged to the outside through the venting device (500). A portion of the venting gas (G) may move along the right-hand direction or the +Y-axis direction and be discharged to the outside through the venting device (500).

[0118] Furthermore, according to this configuration of the present invention, the case (100) forming the exterior of the battery pack may not be damaged by venting gas (G) and ignitable particles (F). Therefore, even if a thermal event occurs, the exterior of the battery pack may stably maintain its shape.

[0119] In addition, the battery pack according to the present invention may further include various other components in addition to the battery module, such as various battery pack components known at the time of filing of the present invention, such as a BMS, a bus bar, a relay, a current sensor, etc.

[0120] The battery pack according to the present invention can be applied to automobiles such as electric vehicles or hybrid vehicles. Specifically, the automobile according to the present invention may include the battery pack according to the present invention. Furthermore, the automobile according to the present invention may further include various other components, in addition to the battery pack. For example, the automobile according to the present invention may further include a body, a motor, a control device such as an electronic control unit (ECU), and the like.

[0121] As described above, although the present invention has been described 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 idea of ​​the present invention and the equivalent scope of the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

Claims

1. A case that provides space inside and has a base plate; A battery module installed on the base plate and including a rear end cover having a venting hole; and A first venting channel covering the rear end cover and having a first inlet hole and a first discharge hole communicating with the venting hole; and A battery pack comprising a second venting channel covering one side of the battery module, coupled with the first venting channel, and having a second inlet hole and a second exhaust hole communicating with the first exhaust hole.

2. In paragraph 1, A battery pack further comprising a third venting channel having a third inlet hole and a third exhaust hole coupled to the second venting channel and communicating with the second exhaust hole.

3. In paragraph 2, The above case is, Further comprising a first partition wall that divides the internal space of the case and covers the front of the battery module, The third venting channel is, A battery pack extending along the first partition wall.

4. In paragraph 3, The third venting channel is, A battery pack coupled to the first partition wall.

5. In paragraph 2, The above case is, Including a side wall installed on the above base plate, The third discharge hole of the third venting channel is, A battery pack communicating with the above side wall.

6. In paragraph 2, Further comprising a venting device installed in the above case, The third discharge hole of the third venting channel is, A battery pack in communication with the above venting device.

7. In paragraph 2, The case further includes a second partition wall that divides the internal space and extends in the front-rear direction, The above second venting channel is, A battery pack coupled to the second partition wall.

8. In paragraph 1, A battery pack further comprising a refractory member positioned between the first discharge hole and the second inlet hole.

9. In paragraph 1, The above refractory member is, Battery pack having a separation line.

10. In paragraph 1, The above case is, including a pack cover positioned above the above battery module, The above second venting channel is, A battery pack located between the battery module and the pack cover.

11. In paragraph 1, The above first venting channel is, A battery pack attached to the above rear end cover.

12. In paragraph 1, The above battery module, A battery pack further comprising a power terminal protruding forward.

13. A vehicle comprising a battery pack according to any one of claims 1 to 12.

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