Battery pack

Abstract

A battery pack is disclosed. A battery pack according to one embodiment of the present invention comprises: a base plate; a frame installed on the base plate, providing a space therein, and having a bottom plate; and a battery cell located inside the frame, wherein the bottom plate may have a first venting hole facing the battery cell.

Description

battery pack

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

[0002] This application claims priority to Korean Patent Application No. 10-2024-0104040, filed on August 5, 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] In addition, the present invention may aim to provide a structure capable of discharging venting gas and ignitable particles with reduced temperature and energy.

[0017] 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.

[0018] In order to achieve the above-described purpose, a battery pack according to one embodiment of the present invention comprises: a base plate; a frame installed on the base plate, providing a space therein, and having a bottom plate; and a battery cell positioned inside the frame, wherein the bottom plate may have a first venting hole facing the battery cell.

[0019] Additionally, the battery pack may further include a heat transfer member disposed between the battery cell and the bottom plate.

[0020] Additionally, the battery pack may further include a first refractory sheet positioned above the bottom plate and covering the first venting hole.

[0021] Additionally, the base plate may have a groove facing the first venting hole.

[0022] In addition, the frame extends in the front-rear direction, and the battery cell includes: a receiving portion extending in the front-rear direction and having an electrode assembly; a rear sealing portion extending rearward from the receiving portion; and a rear electrode lead extending rearward from the rear sealing portion, wherein the first venting hole can face the rear sealing portion.

[0023] In addition, the battery pack further includes a rear venting guide coupled to one side of the rear sealing portion, and a vertical length of the rear venting guide may be shorter than a vertical length of the rear sealing portion.

[0024] Additionally, the lower end of the rear venting guide may be positioned above the lower end of the rear sealing portion.

[0025] In addition, the battery cell may further include: a front sealing portion extending forward from the receiving portion; and a front electrode lead extending forward from the front sealing portion, and the battery pack may further include a front venting guide coupled to one side of the front sealing portion.

[0026] Additionally, the vertical length of the front venting guide may be longer than the vertical length of the rear venting guide.

[0027] Additionally, the vertical length of the front venting guide may be longer than the vertical length of the front sealing portion.

[0028] Additionally, the battery pack may further include an end cover coupled to the rear of the frame and having a second venting hole.

[0029] Additionally, the battery pack may further include a second refractory sheet positioned in front of the end cover and covering the second venting hole.

[0030] Additionally, the second venting hole may be located at the lower portion of the end cover.

[0031] Additionally, the second venting hole may be positioned lower than the lower end of the rear venting guide.

[0032] Additionally, the battery pack may further include a side wall installed on the base plate and facing the end cover.

[0033] Additionally, the frame may include a top plate positioned above the battery cell, and the battery pack may further include a venting guard blocking a space between the top plate and the end cover.

[0034] A vehicle according to one aspect of the present invention comprises a battery pack of the present invention.

[0035] According to at least one of the embodiments of the present invention, when gas or flame is generated inside the battery pack, the discharge of such gas or flame can be appropriately controlled.

[0036] 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.

[0037] According to at least one of the embodiments of the present invention, the electrical safety of a battery pack can be improved.

[0038] According to at least one of the embodiments of the present invention, propagation of a thermal event within a battery pack can be suppressed.

[0039] According to at least one of the embodiments of the present invention, venting gas or ignitable particles can be discharged at a reduced temperature and energy.

[0040] 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.

[0041] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention.

[0042] Figure 2 is a diagram showing a partial configuration of the battery pack of Figure 1.

[0043] Figures 3 and 4 are drawings showing the battery module of Figure 2.

[0044] Figure 5 is a diagram showing a partial configuration of the battery module of Figure 3.

[0045] Figures 6 and 7 are drawings showing a battery cell and a rear venting guide.

[0046] Figures 8 and 9 are drawings showing a battery cell and a front venting guide.

[0047] Figure 10 is a drawing showing venting of a battery cell.

[0048] Fig. 11 is an enlarged view of a portion of the configuration of Fig. 5.

[0049] Figures 12 and 13 are drawings showing the combination of a venting guard and an end cover.

[0050] Figures 14 and 15 are drawings showing the combination of a case and a battery module.

[0051] Fig. 16 is a drawing showing a cross-sectional configuration along the cutting line A-A' of Fig. 1.

[0052] Figure 17 is an enlarged view of part B of Figure 16.

[0053] Figure 18 is a diagram showing the change in Figure 17 when a thermal event occurs.

[0054] Figure 19 is a diagram showing the flow of venting gas when a thermal event occurs.

[0055] Hereinafter, 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.

[0056] 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.

[0057] FIG. 1 is a drawing showing a battery pack according to one embodiment of the present invention. FIG. 2 is a drawing showing a partial configuration of the battery pack of FIG. 1.

[0058] Referring to FIGS. 1 and 2, a battery pack may include a case (100). The case (100) may provide a space therein. 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.

[0059] The battery pack may include a pack cover (150). The pack cover (150) may have a square plate shape. The pack cover (150) may have a flat plate shape. The pack cover (150) may form the exterior of the battery pack. The pack cover (150) may cover the internal space of the battery pack.

[0060] The side wall (120) can be installed, joined, fastened or fixed to the upper surface of the base plate (110). The side wall (120) can form the exterior of the battery pack.

[0061] The battery pack may include a battery module (200). The battery module (200) may be provided in multiples. The battery module (200) may be installed on the upper surface of the base plate (110).

[0062] The battery pack may include a partition wall (300). The partition wall (300) may include a first partition wall (310) and a second partition wall (320). 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).

[0063] The battery pack may include a venting device (500). 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.

[0064] Figures 3 and 4 are drawings showing the battery module (200) of Figure 2. Figure 5 is a drawing showing a partial configuration of the battery module (200) of Figure 3.

[0065] Referring to FIGS. 3 to 5, the battery module (200) may include a frame (210). The frame (210) may be installed, coupled, fastened, attached, or fixed to the upper surface of the base plate (110). The frame (210) may have a rectangular parallelepiped shape. The frame (210) may provide a space inside. The frame (210) may include a top plate (210a), a bottom plate (210b), and a pair of side plates (210c). The frame (210) may have an open front and rear. The frame (210) may have an opening formed in the front. The frame (210) may have an opening formed in the rear.

[0066] Battery cells (220) can be accommodated inside the frame (210). A plurality of battery cells (220) can be provided. A plurality of battery cells (220) can be stacked along the left-right direction or the Y-axis direction.

[0067] 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.

[0068] The bottom plate (210b) may be provided with a first venting hole (201). The first venting hole (201) may be formed on the rear side of the bottom plate (210b). A plurality of first venting holes (201) may be provided. The plurality of first venting holes (201) may be arranged along the left-right direction or the Y-axis direction. The first venting hole (201) may be located below the battery cell (220). The first venting hole (201) may face the battery cell (220).

[0069] When a thermal event occurs, venting gas (G) or ignitable particles, etc., discharged from the battery cell (220) may be discharged to the outside of the battery module (200) through the first venting hole (201). The venting gas (G) or ignitable particles may be discharged downward from the battery module (200) through the first venting hole (201). The venting gas (G) or ignitable particles may collide with the base plate (110), the first partition wall (310), or the side wall (120). As a result, the energy of the venting gas (G) or ignitable particles may be reduced, and the temperature may be lowered.

[0070] A heat transfer member (202) may be placed between the battery cell (220) and the bottom plate (210b). The heat transfer member (202) may fix the battery cell (220). For example, the heat transfer member (202) may be a resin having high thermal conductivity.

[0071] Referring to FIGS. 3 to 5, the battery module (200) may include a pad (250). The pad (250) may be positioned between a plurality of battery cells (220). The pad (250) may be positioned 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 positioned between every two battery cells (220) stacked in the left-right direction.

[0072] The pad (250) may be formed of an elastic material to enable swelling absorption of the battery cell (220). For example, the pad (250) may be formed of a foam material such as polyurethane. Alternatively, the pad (250) may be formed of a material capable of blocking heat or flames. For example, the pad (250) may be formed of an insulating or fire-retardant material such as silicone or mica.

[0073] The battery module (200) may include a front busbar frame assembly (231). The front busbar frame assembly (231) may be provided in front of a plurality of battery cells (220). The front busbar frame assembly (231) may be provided in front of a front venting guide (225a). The front busbar frame assembly (231) may be electrically connected to front electrode leads (224a) of the plurality of battery cells (220).

[0074] The battery module (200) may include a front end cover (241). The front end cover (241) may be coupled to the front of the frame (210). The front end cover (241) may cover the front of the frame (210). The front end cover (241) may have a square shape.

[0075] The battery module (200) may include a front insulating cover (261). The front insulating cover (261) may be positioned between the front end cover (241) and the front busbar frame assembly (231). The front insulating cover (261) may electrically insulate the front busbar frame assembly (231) and the front end cover (241).

[0076] Figures 6 and 7 are drawings showing a battery cell (220) and a rear venting guide (225b).

[0077] Referring to FIGS. 6 and 7, the battery cell (220) may include a receiving portion (221) having an electrode assembly. The receiving portion (221) may extend in the front-rear direction or along the X-axis direction. The battery cell (220) may include a rear sealing portion (223b) protruding toward the rear of the receiving portion (221). The battery cell (220) may include a rear electrode lead (224b) protruding toward the rear of the rear sealing portion (223b). The battery cell (220) may include a top sealing portion (222) extending upwardly from the receiving portion (221). The top sealing portion (222) may extend along the front-rear direction or along the X-axis direction.

[0078] The rear venting guide (225b) may be coupled to one side of the rear sealing portion (223b). The rear venting guides (225b) may be provided as a pair and may be coupled to both sides of the rear sealing portion (223b). The rear venting guide (225b) may be attached to the rear sealing portion (223b). The rear venting guide (225b) may extend in the vertical direction or the Z-axis direction. The vertical length of the rear venting guide (225b) may be shorter than the vertical length of the rear sealing portion (223b). The rear venting guide (225b) may be attached to the upper portion of the rear sealing portion (223b). The lower portion of the rear sealing portion (223b) may not be coupled to the rear venting guide (225b).

[0079] When a thermal event occurs, the rear venting guide (225b) can suppress the discharge of venting gas (G) or ignitable particles. The rear venting guide (225b) can suppress the rear sealing portion (223b) from opening or bursting. A portion of the rear sealing portion (223b) to which the rear venting guide (225b) is not attached may open or burst more easily than a portion to which the rear venting guide (225b) is attached. When a thermal event occurs, the venting gas (G) or ignitable particles may be discharged from a portion of the rear sealing portion (223b) to which the rear venting guide (225b) is not attached.

[0080] A pair of rear venting guides (225b) may be provided for each battery cell (220).

[0081] Figures 8 and 9 are drawings showing a battery cell (220) and a front venting guide (225a).

[0082] Referring to FIGS. 8 and 9, the battery cell (220) may include a front sealing portion (223a) protruding forward of the receiving portion (221). The battery cell (220) may include a front electrode lead (224a) protruding forward of the front sealing portion (223a).

[0083] The front venting guide (225a) may be coupled to one side of the front sealing portion (223a). The front venting guides (225a) may be provided as a pair and may be coupled to both sides of the front sealing portion (223a). The front venting guide (225a) may be attached to the front sealing portion (223a). The front venting guide (225a) may extend in the vertical direction or the Z-axis direction. The vertical length of the front venting guide (225a) may be substantially the same as the vertical length of the front sealing portion (223a). Alternatively, the vertical length of the front venting guide (225a) may be longer than the vertical length of the front sealing portion (223a).

[0084] When a thermal event occurs, the front venting guide (225a) can suppress the discharge of venting gas (G) or ignitable particles. The front venting guide (225a) can suppress the front sealing portion (223a) from opening or bursting. The rear sealing portion (223b) can open or burst more easily than the front sealing portion (223a). When a thermal event occurs, the venting gas (G) or ignitable particles may not be discharged through the front sealing portion (223a), but may be discharged through a portion of the rear sealing portion (223b) to which the rear venting guide (225b) is not attached. A pair of front venting guides (225a) may be provided for each battery cell (220).

[0085] Figure 10 is a drawing showing venting of a battery cell (220).

[0086] Referring to FIGS. 6 to 10, the vertical length (L3) of the front venting guide (225a) may be longer than the vertical length (L2) of the rear venting guide (225b). Since the front venting guide (225a) is formed longer than the rear venting guide (225b), the rear sealing portion (223b) may be opened or burst more easily than the front sealing portion (223a). When a thermal event occurs, the venting gas (G) or flammable particles may not be discharged through the front sealing portion (223a), but may be discharged through a portion of the rear sealing portion (223b) to which the rear venting guide (225b) is not attached.

[0087] The vertical length (L2) of the rear venting guide (225b) may be shorter than the vertical length (L1) of the storage portion (221).

[0088] The vertical length (L3) of the front venting guide (225a) may be substantially the same as the vertical length (L1) of the storage portion (221). Alternatively, the vertical length (L3) of the front venting guide (225a) may be longer than the vertical length (L1) of the storage portion (221).

[0089] Fig. 11 is an enlarged view of a portion of the configuration of Fig. 5.

[0090] Referring to FIGS. 5 and 11, the battery module (200) may include a rear end cover (242). The rear end cover (242) may be coupled to the rear of the frame (210). The rear end cover (242) may be coupled to an opening formed at the rear of the frame (210). The rear end cover (242) may include a second venting hole (242a). The second venting hole (242a) may be formed at the lower portion of the rear end cover (242). A plurality of second venting holes (242a) may be provided. The plurality of second venting holes (242a) may be arranged along the left-right direction or the Y-axis direction.

[0091] When a thermal event occurs, venting gas (G) or ignitable particles, etc., discharged from the battery cell (220) may be discharged to the outside of the battery module (200) through the second venting hole (242a). The venting gas (G) or ignitable particles may be discharged to the rear of the battery module (200) through the second venting hole (242a). The venting gas (G) or ignitable particles may collide with the base plate (110), the first partition wall (310), or the side wall (120). As a result, the energy of the venting gas (G) or ignitable particles may be reduced, and the temperature may be lowered.

[0092] The second refractory sheet (270) may be positioned in front of the rear end cover (242). The second refractory sheet (270) may cover the second venting hole (242a). The second refractory sheet (270) may include a refractory material. The second refractory sheet (270) may include a heat-resistant material.

[0093] When a thermal event occurs, venting gas (G) or ignitable particles, etc., discharged from the battery cell (220) may rupture the second refractory sheet (270) and be discharged to the outside of the battery module (200) through the second venting hole (242a). At this time, the second refractory sheet (270) may rupture only in a specific portion where the pressure of the venting gas (G) is high, while other portions may not rupture. Accordingly, the portion of the second refractory sheet (270) that is not ruptured may block the venting gas (G) or ignitable particles discharged to the outside of the battery module (200) from flowing into the inside of the battery module (200).

[0094] The battery module (200) may include a rear busbar frame assembly (232). The rear busbar frame assembly (232) may be provided at the rear of a plurality of battery cells (220). The rear busbar frame assembly (232) may be provided at the rear of a rear venting guide (225b). The rear busbar frame assembly (232) may be electrically connected to rear electrode leads (224b) of the plurality of battery cells (220). The rear busbar frame assembly (232) may include a fourth venting hole (232a). The fourth venting hole (232a) may be formed at the lower portion of the rear busbar frame assembly (232). A plurality of fourth venting holes (232a) may be provided. The plurality of fourth venting holes (232a) may be arranged along the left-right direction or the Y-axis direction. A plurality of fourth venting holes (232a) may be provided in one-to-one correspondence with a plurality of second venting holes (242a). A plurality of fourth venting holes (232a) may face a plurality of second venting holes (242a).

[0095] The battery module (200) may include a rear insulating cover (262). The rear insulating cover (262) may be positioned between the rear end cover (242) and the rear busbar frame assembly (232). The rear insulating cover (262) may electrically insulate the rear busbar frame assembly (232) and the rear end cover (242). The rear insulating cover (262) may include a third venting hole (262a). The third venting hole (262a) may be formed at a lower portion of the rear insulating cover (262). A plurality of third venting holes (262a) may be provided. The plurality of third venting holes (262a) may be arranged along the left-right direction or the Y-axis direction. The plurality of third venting holes (262a) may be provided to correspond one-to-one with a plurality of second venting holes (242a). A plurality of third venting holes (262a) may face a plurality of second venting holes (242a). The plurality of third venting holes (262a) may be provided to correspond one-to-one with a plurality of fourth venting holes (232a). The plurality of third venting holes (262a) may face a plurality of fourth venting holes (232a). The second fire-resistant sheet (270) may be positioned between the rear insulating cover (262) and the rear end cover (242). The second fire-resistant sheet (270) may be fixed between the rear insulating cover (262) and the rear end cover (242). The second fire-resistant sheet (270) may be coupled, fastened, attached, or fixed to the rear insulating cover (262). The second fire-resistant sheet (270) may be coupled, fastened, attached, or fixed to the rear end cover (242).

[0096] Figures 12 and 13 are drawings showing the combination of a venting guard (291, 292) and an end cover (241, 242).

[0097] Referring to FIGS. 2, 12, and 13, the battery module (200) may include a rear venting guard (292). The rear venting guard (292) may cover a space between the top plate (210a) and the rear end cover (242). The rear venting guard (292) may be fastened, coupled, fixed, or attached to the rear end cover (242). A fastening member (S) may fasten the rear venting guard (292) to the rear end cover (242). The rear venting guard (292) may suppress the discharge of venting gas (G) or ignitable particles between the rear end cover (242) and the top plate (210a). The rear venting guard (292) may prevent the pack cover (150) from being damaged due to the discharge of venting gas (G) or ignitable particles. The rear venting guard (292) can prevent the exterior of the battery pack from being damaged. The rear venting guard (292) can block venting gas (G) or flammable particles from being discharged to the outside of the battery pack.

[0098] The battery module (200) may include a front venting guard (291). The front venting guard (291) may cover a space between the top plate (210a) and the front end cover (241). The front venting guard (291) may be fastened, coupled, fixed, or attached to the front end cover (241). A fastening member (S) may fasten the front venting guard (291) to the front end cover (241). The front venting guard (291) may suppress the discharge of venting gas (G) or ignitable particles between the front end cover (241) and the top plate (210a). The front venting guard (291) may prevent the pack cover (150) from being damaged due to the discharge of venting gas (G) or ignitable particles. The front venting guard (291) may prevent the exterior of the battery pack from being damaged. The front venting guard (291) can block venting gas (G) or flammable particles from being discharged to the outside of the battery pack.

[0099] The battery module (200) may include a power terminal (231a) protruding forward of the frame (210). 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).

[0100] 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).

[0101] Figures 14 and 15 are drawings showing the combination of a case (100) and a battery module (200).

[0102] Referring to FIGS. 14 and 15, the base plate (110) may have a groove (112). The groove (112) may form a step in the downward direction or the -Z-axis direction. The mount (111) may be positioned in the groove (112). The battery module (200) may be fastened, coupled, fixed, or attached to a pair of mounts (111). The groove (112) may form a gap between the base plate (110) and the bottom plate (210b). The side wall (120) may face the rear end cover (242). A gap may be formed between the side wall (120) and the rear end cover (242).

[0103] Fig. 16 is a drawing showing a cross-sectional configuration along the cutting line A-A' of Fig. 1.

[0104] Referring to FIG. 16, the base plate (110) may face the first venting hole (201). The groove (112) may face the first venting hole (201). The groove (112) may face the first refractory sheet (280). The groove (112) may form a gap between the base plate (110) and the first venting hole (201). When a thermal event occurs, the venting gas (G) or ignitable particles discharged through the first venting hole (201) may be accommodated in the groove (112).

[0105] The first refractory sheet (280) may be positioned above the first venting hole (201). The first refractory sheet (280) may cover the first venting hole (201). The first refractory sheet (280) may include a refractory material. The first refractory sheet (280) may include a heat-resistant material.

[0106] When a thermal event occurs, venting gas (G) or ignitable particles discharged from the battery cell (220) may rupture the first refractory sheet (280) and be discharged to the outside of the battery module (200) through the first venting hole (201). At this time, the first refractory sheet (280) may rupture only in a specific portion where the pressure of the venting gas (G) is high, while other portions may not rupture. Accordingly, the portion of the first refractory sheet (280) that is not ruptured may block the venting gas (G) or ignitable particles discharged to the outside of the battery module (200) from flowing into the inside of the battery module (200).

[0107] The pack cover (150) can cover the top plate (210a). The pack cover (150) can cover the front venting guard (291). The pack cover (150) can cover the rear venting guard (292). The second partition wall (320) can face the front end cover (241).

[0108] Figure 17 is an enlarged view of part B of Figure 16.

[0109] Referring to Fig. 17, the first venting hole (201) may face the rear sealing portion (223b). The first venting hole (201) may be located below the rear sealing portion (223b). The first refractory sheet (280) may be located between the first venting hole (201) and the rear sealing portion (223b). The first refractory sheet (280) may cover the first venting hole (201).

[0110] The fourth venting hole (232a) may face the rear sealing portion (223b). The fourth venting hole (232a) may be located behind the rear sealing portion (223b). The third venting hole (262a) may face the fourth venting hole (232a). The third venting hole (262a) may be located behind the fourth venting hole (232a). The second refractory sheet (270) may cover the third venting hole (262a). The second refractory sheet (270) may be located between the third venting hole (262a) and the second venting hole (242a). The second venting hole (242a) may be located behind the second refractory sheet (270). The second venting hole (242a) may face the third venting hole (262a).

[0111] The rear venting guide (225b) can guide venting gas (G) or ignitable particles to be discharged through the lower portion of the rear sealing portion (223b). The lower portion of the rear venting guide (225b) can be positioned higher than the lower portion of the rear sealing portion (223b). The height (H3) of the lower portion of the rear venting guide (225b) can be higher than the height (H1) of the lower portion of the rear sealing portion (223b).

[0112] The rear venting guide (225b) may be positioned so as not to obstruct the venting gas (G) or ignitable particles discharged through the rear sealing portion (223b) from being discharged through the fourth venting hole (232a). The height (H3) of the lower end of the rear venting guide (225b) may be the same as the height (H2) of the upper end of the fourth venting hole (232a). Alternatively, the lower end of the rear venting guide (225b) may be higher than the fourth venting hole (232a). The height (H3) of the lower end of the rear venting guide (225b) may be the same as the height (H2) of the upper end of the third venting hole (262a). Alternatively, the lower end of the rear venting guide (225b) may be higher than the third venting hole (262a). The height (H3) of the lower end of the rear venting guide (225b) may be the same as the height (H2) of the upper end of the second venting hole (242a). Alternatively, the lower end of the rear venting guide (225b) may be higher than the second venting hole (242a).

[0113] Figure 18 is a diagram showing the change in Figure 17 when a thermal event occurs.

[0114] Referring to Fig. 18, when a thermal event occurs, venting gas (G) or ignitable particles may be discharged through the rear sealing portion (223b). The venting gas (G) or ignitable particles may rupture the first refractory sheet (280). The venting gas (G) or ignitable particles may be discharged to the outside of the battery module (200) through the first venting hole (201). The groove (112) may accommodate the venting gas (G) or ignitable particles discharged through the first venting hole (201). The groove (112) may provide a space so that the venting gas (G) or ignitable particles may be smoothly discharged through the first venting hole (201). The unruptured portion of the first refractory sheet (280) can block venting gas (G) or flammable particles discharged to the outside of the battery module (200) from flowing into the inside of the battery module (200).

[0115] The venting gas (G) or ignitable particles can rupture the second refractory sheet (270). The venting gas (G) or ignitable particles can be discharged to the outside of the battery module (200) through the fourth venting hole (232a), the third venting hole (262a), and the second venting hole (242a). The space between the side wall (120) and the rear end cover (242) can accommodate the venting gas (G) or ignitable particles discharged through the fourth venting hole (232a), the third venting hole (262a), and the second venting hole (242a). The space between the side wall (120) and the rear end cover (242) can provide a space so that the venting gas (G) or ignitable particles can be smoothly discharged through the second venting hole (242a). The unruptured portion of the second refractory sheet (270) can block venting gas (G) or flammable particles discharged to the outside of the battery module (200) from flowing into the inside of the battery module (200).

[0116] Figure 19 is a diagram showing the flow of venting gas (G) when a thermal event occurs.

[0117] Referring to Fig. 19, the venting gas (G) or ignitable particles discharged through the first venting hole (201) can flow along the space between the battery module (200) and the side wall (120). The venting gas (G) or ignitable particles discharged through the first venting hole (201) can flow along the space between the battery module (200) and the groove (112). The venting gas (G) or ignitable particles discharged through the first venting hole (201) can flow along the space between the first partition wall (310) and the battery module (200). In addition, the venting gas (G) or ignitable particles discharged through the first venting hole (201) can rise upward and be discharged through the venting device (500). By lengthening the venting path of the venting gas (G) or ignitable particles, the temperature or energy of the venting gas (G) or ignitable particles may be reduced.

[0118] The venting gas (G) or ignitable particles discharged through the second venting hole (242a) can flow along the space between the battery module (200) and the side wall (120). The venting gas (G) or ignitable particles discharged through the second venting hole (242a) can flow along the space between the battery module (200) and the groove (112). The venting gas (G) or ignitable particles discharged through the second venting hole (242a) can flow along the space between the first partition wall (310) and the battery module (200). And the venting gas (G) or ignitable particles discharged through the second venting hole (242a) can rise upward and be discharged through the venting device (500). As the venting path of the venting gas (G) or ignitable particles becomes longer, the temperature or energy of the venting gas (G) or ignitable particles can be reduced.

[0119] In addition, the battery pack according to the present invention may further include various other components in addition to the battery module (200), such as various battery pack components known at the time of application 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. Base plate; A frame installed on the above base plate, providing space inside, and having a bottom plate; and Contains a battery cell positioned inside the frame, The above bottom plate, A battery pack having a first venting hole facing the battery cell.

2. In paragraph 1, A battery pack further comprising a heat transfer member disposed between the battery cell and the bottom plate.

3. In paragraph 1, Located above the above bottom plate, A battery pack further comprising a first refractory sheet covering the first venting hole.

4. In paragraph 1, The above base plate, A battery pack having a groove facing the first venting hole.

5. In paragraph 1, The above frame is, Extending in the forward and backward direction, The above battery cell: A receiving portion extending in the forward-backward direction and having an electrode assembly; A rear sealing portion extending rearward from the above storage portion; and, Includes a rear electrode lead extending rearward from the rear sealing portion, The above first venting hole is, Battery pack facing the above rear sealing part.

6. In paragraph 5, Further comprising a rear venting guide coupled to one side of the rear sealing portion, The length of the above rear venting guide in the vertical direction is: A battery pack shorter than the vertical length of the rear sealing portion.

7. In paragraph 5, The bottom of the above rear venting guide is: A battery pack located above the lower part of the rear sealing portion.

8. In paragraph 5, The above battery cell: A front sealing portion extending forward from the above storage portion; and, Further comprising a front electrode lead extending forward from the front sealing portion, The above battery pack, A battery pack further comprising a front venting guide coupled to one side of the front sealing portion.

9. In paragraph 8, The length of the front venting guide in the vertical direction is: A battery pack longer than the vertical length of the above rear venting guide.

10. In paragraph 8, The length of the front venting guide in the vertical direction is: A battery pack longer than the vertical length of the front sealing portion.

11. In paragraph 6, A battery pack further comprising an end cover coupled to the rear of the frame and having a second venting hole.

12. In paragraph 11, A battery pack further comprising a second refractory sheet positioned in front of the end cover and covering the second venting hole.

13. In paragraph 11, The above second venting hole is, A battery pack located at the bottom of the above end cover.

14. In paragraph 11, The above second venting hole is, A battery pack positioned lower than the bottom of the above rear venting guide.

15. In paragraph 11, A battery pack installed on the base plate and further including a side wall facing the end cover.

16. In paragraph 11, The above frame is, including a top plate positioned above the battery cell, The above battery pack, A battery pack further comprising a venting guard blocking a space between the top plate and the end cover.

17. A vehicle comprising a battery pack according to any one of claims 1 to 16.

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