Battery pack and device comprising same

Abstract

The battery pack according to an embodiment of the present invention comprises multiple battery modules and a pack frame in which the battery modules are contained. Each battery module comprises: a battery cell stack obtained by stacking multiple battery cells including electrode leads; and a module frame in which the battery cell stack is contained. The battery pack comprises a block positioned to face one surface of battery modules in a direction in which the electrode leads protrude. The block is attached to one surface or both surfaces of a partition wall for containing the battery modules.

Description

Battery pack and device including same

[0001] Cross-citation with related application(s)

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2024-0018639, filed February 7, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery pack and a device including the same, and more particularly, to a battery module and a battery pack including the same, which can effectively control heat transfer by inducing exhaust of gas or flame from the upper side of the module when an event such as an internal short circuit or fire occurs even without an end plate.

[0004] In modern society, the widespread use of portable devices like cell phones, laptops, camcorders, and digital cameras has fueled active development of technologies related to these devices. Furthermore, rechargeable secondary batteries are increasingly being used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) to address air pollution caused by conventional gasoline-powered vehicles, further increasing the need for secondary battery development.

[0005] 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.

[0006] These lithium secondary batteries primarily use lithium oxide and carbon materials as the positive and negative electrode active materials, respectively. The lithium secondary battery comprises an electrode assembly comprising a positive electrode plate and a negative electrode plate, each coated with the positive and negative electrode active materials, with a separator interposed between them, and a battery case that seals and houses the electrode assembly together with an electrolyte.

[0007] 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.

[0008] Secondary batteries used in small devices are configured with 2-3 battery cells, but secondary batteries used in medium- to large-sized devices such as automobiles utilize battery modules in which multiple battery cells are electrically connected. These battery modules enhance capacity and output by forming a battery cell stack by connecting multiple battery cells in series or parallel. In addition, one or more battery modules may be mounted together with various control and protection systems, such as a Battery Disconnect Unit (BDU), a Battery Management System (BMS), and a cooling system, to form a battery pack.

[0009] Secondary batteries can experience performance degradation and, in severe cases, even explosion or fire if exposed to temperatures exceeding their optimal levels. In particular, battery modules or battery packs comprising multiple secondary batteries, or battery cells, can experience a rapid and severe temperature rise due to the accumulation of heat from these cells within a confined space. In other words, battery modules comprising stacked cells and battery packs equipped with such modules can achieve high output, but it is difficult to remove the heat generated by the cells during charging and discharging. If the heat dissipation of the battery cells is inadequate, the cells deteriorate more quickly, shortening their lifespan and increasing the risk of explosion or fire.

[0010] Figure 1 is a perspective view showing a conventional battery module.

[0011] Referring to FIG. 1, a conventional battery module (10) may include a module frame (30) that accommodates a battery cell stack (20) and an end plate (60) that covers the front and back surfaces of the battery cell stack (20). In addition, the conventional battery module (10) may further include a bus bar frame (70) positioned between the end plate (60) and the battery cell stack (20).

[0012] The module frame (30) may include a U-shaped frame (40) with an open top, front, and back, and an upper plate (50) covering the upper portion of the battery cell stack (20). However, the module frame (30) is not limited thereto, and may be replaced with a frame of another shape, such as an L-shaped frame or a mono-frame that surrounds the battery cell stack (20) except for the front and back.

[0013] A busbar frame (70) may be equipped with a busbar that electrically connects the battery cells in the battery cell stack (20) to electrically connect the battery cells in the battery cell stack (20) that are stacked in parallel.

[0014] In order to improve the heat transfer delay performance, a hole (not shown) is provided at the top of the battery module (10) so that gas or flame generated when an event occurs can be discharged to the top side of the battery module (10). In this case, in order to discharge the gas or flame to the top side of the battery module (10), all sides except the top of the battery module (10) must be sealed. To this end, the structure of the general battery module (10) is such that the sides except the top of the battery module (10) are sealed with a module frame (30) or an end plate (60). In particular, the end plate (60) covers one or both open sides of the module frame (30). The end plate (60) can be joined to the module frame (30) by welding. Accordingly, the battery module (10) can be sealed on all sides except the top by the module frame (30) and the end plate (60) covering one or both open sides of the module frame (30).

[0015] When an end plate (60) is included in a battery module (10), the energy density is reduced and the production cost of the battery module (10) increases. In addition, when the end plate (60) is attached to the battery module (10) by welding, welding equipment is introduced and a welding process is added in the manufacturing process of the battery module (10), so the production cost of the battery module (10) increases.

[0016] The problem to be solved by the present invention is to prevent the forward or side discharge of gas or flames when an event such as an internal short circuit or fire occurs inside a battery module, and specifically, to provide a battery pack and a device including the same that can effectively control heat transfer by inducing discharge of gas or flames from the upper side of the battery module even without an end plate.

[0017] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0018] According to one embodiment of the present invention, a battery pack includes a plurality of battery modules and a pack frame in which the battery modules are accommodated, wherein the battery module includes a battery cell stack in which a plurality of battery cells including electrode leads are stacked; and a module frame in which the battery cell stack is accommodated. The battery pack includes a block positioned to face one side of the battery modules in a direction in which the electrode leads protrude, and the block is attached to one or both sides of a partition wall for accommodating the battery modules.

[0019] The above block may include a refractory material.

[0020] The battery module may include a bus bar connecting the electrode leads, and one side of the battery module may be opened so that the electrode leads and the bus bar are exposed on the one side in the direction in which the electrode leads protrude.

[0021] Among the above battery modules, one side of the battery module in the direction in which the electrode lead protrudes can be in contact with the block.

[0022] The battery module may include a busbar frame assembly positioned on one side of the battery cell stack in a direction in which the electrode leads protrude, and the busbar frame assembly may include: a busbar frame; and at least one busbar disposed on the busbar frame and connected to the electrode leads.

[0023] A busbar frame assembly cover covering the above busbar frame assembly may be included.

[0024] At least one venting hole for internal gas discharge may be formed in the upper portion of the module frame.

[0025] It may include a module frame cover covering the upper portion of the module frame.

[0026] A rupture portion having a structure that is positioned to correspond to the venting hole and ruptures when a certain pressure or higher is applied may be formed in the above module frame cover.

[0027] An opening may be formed in an area excluding a connecting portion among the perimeter of the above-mentioned rupture portion, and the above-mentioned rupture portion may be connected to the module frame cover by the connecting portion.

[0028] On the upper part of the module frame cover, when viewed in a direction perpendicular to the upper part of the module frame cover, the opening may be formed outside the venting hole.

[0029] According to embodiments of the present invention, even if the battery module does not include an end plate, in the event of an internal short circuit, fire, or other event, gas or flames can be induced to be discharged from the upper side of the battery module. This allows for effective control of heat transfer in the battery module.

[0030] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0031] Figure 1 is a perspective view showing a conventional battery module.

[0032] Figure 2 is a perspective view showing a battery pack according to one embodiment of the present invention.

[0033] Figure 3 is a partial perspective view showing a battery pack according to one embodiment of the present invention.

[0034] Figure 4 is a perspective view showing a pouch-type battery according to one embodiment of the present invention.

[0035] FIG. 5 is an exploded perspective view showing one of the battery modules included in the battery pack of FIG. 2.

[0036] Figure 6 is an exploded perspective view of a battery module and a battery pack according to one embodiment of the present invention.

[0037] FIG. 7 is a perspective view of a battery module and a battery pack according to one embodiment of the present invention.

[0038] Figure 8 is a plan view of a battery module and a battery pack according to one embodiment of the present invention.

[0039] Fig. 9 is a cross-sectional view showing a cross-section of a battery module cut along the cutting line A-A' of Fig. 8.

[0040] Figure 10 is a cross-sectional view of a battery module according to another embodiment of the present invention.

[0041] Figure 11 is a plan view of a battery module according to one embodiment of the present invention.

[0042] Figure 12 is an exploded perspective view showing a battery module according to one embodiment of the present invention.

[0043] Figure 13 is a perspective view of a battery module according to one embodiment of the present invention.

[0044] Figure 14 is a plan view of a battery module according to one embodiment of the present invention.

[0045] Figure 15 is an exploded perspective view of a battery module according to one embodiment of the present invention.

[0046] Figure 16 is a perspective view of a battery module according to one embodiment of the present invention.

[0047] Figure 17 is a plan view of a battery module according to one embodiment of the present invention.

[0048] Fig. 18 is a cross-sectional view showing a cross-section of a battery module cut along the cutting line B-B' of Fig. 17.

[0049] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0050] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0051] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0052] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, we mean that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the reference part in the opposite direction of gravity.

[0053] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0054] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0055] Fig. 2 is a perspective view showing a battery pack (1000) according to one embodiment of the present invention. Fig. 3 is a partial perspective view showing a battery pack (1000) according to one embodiment of the present invention. Fig. 4 is a perspective view showing a pouch-type battery according to one embodiment of the present invention. Fig. 5 is an exploded perspective view showing one of the battery modules (100) included in the battery pack (1000) of Fig. 2.

[0056] Referring to FIGS. 2 to 5, a battery pack (1000) according to one embodiment of the present invention includes a plurality of battery modules (100) and a pack frame (1100) in which the battery modules (100) are stored. The battery pack (1000) includes a block (1300) positioned to face one side of the battery module (100) in the direction in which the electrode leads (111) protrude (+y-axis or -y-axis direction in FIG. 5).

[0057] The battery pack (1000) includes a partition wall (1200) for storing battery modules (100). The battery modules (100) stored in the battery pack (1000) can be positioned so as to be separated from each other by the partition wall (1200). The partition wall (1200) can have various shapes, materials, etc. according to the shape, arrangement, etc. of the battery modules (100) stored in the battery pack (1000). The partition wall (1200) allows battery modules (100) of various shapes to be more stably and easily stored inside the pack frame (1100). The block (1300) is attached to one or both sides of the partition wall (1200) for storing the battery modules (100). The block (1300) can be located between the battery module (100) and the partition wall (1200). Through this, when an event such as an internal short circuit or fire occurs, gas or flames emitted from the battery module (100) may not spread to other adjacent battery modules (100).

[0058] The thickness of the bulkhead (1200) can be determined by the size of the battery pack (1000), the electric capacity of the battery module (100), etc. Preferably, the bulkhead (1200) can have a thickness of 2 mm to 3 mm.

[0059] The block (1300) is sufficient as long as it contains a material that is not deformed by high-temperature gas or flame. The block (1300) is not limited in shape, material, number, etc.

[0060] The block (1300) may include a refractory material. The refractory material can suppress ignition caused by gases or flames emitted from the battery module (100) in the event of an internal short circuit, fire, or other event. The refractory material can exhibit excellent insulation properties in the event of ignition. Therefore, the refractory material can suppress electrical connection between the bulkhead (1200) and the busbar (142) in the event of ignition. In addition, the refractory material can prevent forward or lateral discharge of gases or flames.

[0061] Hereinafter, referring again to FIG. 5, a battery module (100) according to the present embodiment will be described. However, the battery module (100) described below is an exemplary structure of a battery module (100) including a plurality of battery cells (110), and various types of battery modules including a plurality of battery cells (110) may be applied.

[0062] Referring to FIGS. 4 and 5, a battery module (100) according to the present embodiment includes a battery cell stack (120) in which a plurality of battery cells (110) including electrode leads (111) are stacked, and a module frame (130) in which the battery cell stack (120) is accommodated. The battery module (100) according to the present embodiment may include a bus bar (142) connecting the electrode leads (111). The electrode leads (111) of the battery cells (110) may be electrically connected to each other via the bus bar (142).

[0063] A battery cell (110) may include an electrode assembly (not shown) and a cell case that accommodates the electrode assembly. The cell case may include a storage portion (112) that accommodates the electrode assembly (not shown), a sealing portion (113) formed at an edge of the battery cell (110) to seal the electrode assembly (not shown), and a terrace portion (114) that extends from the cell case in a direction in which the electrode lead (111) protrudes.

[0064] Although not shown in the drawing, the cell case may be sealed by heat-sealing the edges of each pair of cases made of a multi-layer pouch film in which a resin layer / metal layer / resin layer is sequentially laminated. In this case, a storage portion (112) may be formed in at least one of the pair of cases, and the sealed edge portion may form a sealing portion (113).

[0065] The battery cell (110) may have a structure in which two electrode leads (111) face each other and protrude from each end of the battery body. As another embodiment, a structure in which all of the electrode leads (111) of the battery cell (110) protrude in one direction is also possible. One of the electrode leads (111) is a positive electrode lead, and the other is a negative electrode lead. In addition, the battery cell (110) may be manufactured in a pouch shape by housing an electrode assembly (not shown) in a housing (112) including the battery body.

[0066] The storage portion (112) can store the electrode assembly together with the electrolyte, and the sealing portion (113) can be sealed while a portion of the electrode lead (111) protrudes outward. In addition, the terrace portion (114) can be a portion of the sealing portion (113) located on both sides with respect to the electric length direction of the battery cell (110) (Y-axis direction in FIGS. 5 and 6). That is, the electrode lead (111) can protrude outward through the terrace portion (114).

[0067] As described above, compared with FIG. 1 showing a conventional battery module (10), the battery module (100) according to the present embodiment does not have an end plate (60). In other words, the battery module (100) according to the present embodiment has a structure in which a busbar frame assembly (140) described later is exposed. In the conventional battery module (10), the end plate (60) is welded to the front and back of the battery module (10) to seal all surfaces except the upper portion of the battery module (100) so that flames and gases are ejected to the upper portion of the battery module (10) when an event occurs. When the end plate (60) is introduced to the battery module (10), the energy density is lowered and the production cost of the battery module (10) increases. In addition, when the end plate (60) is welded to the battery module (10), welding equipment is introduced and a welding process is added in the battery module (10) manufacturing process, so the production cost of the battery module (10) increases.

[0068] According to one embodiment of the present invention, the battery module (100) includes a block (1300) in the bulkhead (1200) of the battery pack (1000), even without an end plate, thereby allowing gas or flames to be discharged to the upper side of the battery module (100) in the event of an internal short circuit, fire, or the like. Through this, heat transfer of the battery module (100) can be effectively controlled.

[0069] In other words, the battery module according to one embodiment of the present invention can effectively control heat transfer without having an end plate. Since the end plate is not provided, welding equipment is not required in the manufacturing process of the battery module (100), thereby reducing equipment costs. Furthermore, since the welding process is not required, the production cost of the battery module (100) can be reduced. Since the defect rate due to the welding process is also reduced, the yield of the battery module (100) can be stably secured. The production cost of the battery module (100) can also be reduced.

[0070] The module frame (130) may be composed of a lower module frame (131) and an upper module frame (132), as illustrated in FIG. 5. The lower module frame (131) and the upper module frame (132) may be joined by bolting or welding, and there is no limitation on the joining method. The module frame (130) is not limited thereto, and may be replaced with a frame of another shape, such as an L-shaped frame or a mono frame that surrounds the battery cell stack (120) except for the front and rear sides.

[0071] As described above, the battery cell (110) and battery module (100) described in FIG. 5 are exemplary structures, and there is no particular limitation on the type or shape of the battery cell (110) and battery module (100) included in the battery pack (1000, see FIG. 2). That is, although the pouch-type battery cell (110) has been described as an example, square battery cells or cylindrical battery cells may also be applied to the battery module (100) according to an embodiment of the present invention. In addition, although the battery module (100) in which the battery cells (110) are housed in the module frame (130) has been described as an example, a CTP (cell to pack) type battery module in which a plurality of battery cells (110) are mounted in the battery pack (1000, see FIG. 2) without being housed in the module frame (130) may also be applied as an example of the present invention.

[0072] Fig. 6 is an exploded perspective view of a battery module (100) and a battery pack (1000) according to one embodiment of the present invention. Fig. 7 is a perspective view of a battery module (100) and a battery pack (1000) according to one embodiment of the present invention. Fig. 8 is a plan view of a battery module (100) and a battery pack (1000) according to one embodiment of the present invention. In particular, Figs. 6 to 8 show the direction and position of the battery module (100) assembled into the battery pack (1000), and also show the correspondence between the configuration of the battery module (100) and the configuration of the battery pack (1000).

[0073] Referring to FIGS. 5 to 8, a battery module (100) according to one embodiment of the present invention may have one side opened so that the electrode lead (111) and the bus bar (142) are exposed on one side in the direction in which the electrode lead (111) protrudes.

[0074] Fig. 9 is a cross-sectional view showing a cross-section of a battery module (100) taken along the cutting line A-A' of Fig. 8. In particular, Fig. 9 shows the correspondence between a bus bar (142) of a battery module (100) and a block (1300) of a battery pack (1000).

[0075] Referring to FIGS. 8 and 9, when an event occurs, flame and gas can be discharged along the direction in which the electrode leads (111) protrude from the battery cells (110). That is, the flame and gas can be discharged toward one side (+y-axis or -y-axis direction in FIG. 9) of the battery module (100) where the electrode leads (111) and the bus bar (142) are exposed. At this time, the discharge path of the flame and gas can be changed to the upper side (+z-axis direction in FIG. 9) of the battery module (100) by the partition wall (1200) of the battery pack (1000) and the block (1300) provided in the partition wall (1200). That is, the flame and gas discharged along the direction in which the electrode leads (111) protrude from the battery cells (110) can be blocked by the block (1300) provided in the partition wall (1200) and guided toward the upper side of the battery module (100).

[0076] FIG. 10 is a cross-sectional view of a battery module (100) according to another embodiment of the present invention.

[0077] Referring to FIGS. 8 and 10, one side of a battery module (100) according to another embodiment of the present invention may be in contact with a block (1300) on one side in the direction in which the electrode lead (111) protrudes. Since one side of the battery module (100) is in contact with the block (1300), when an event occurs, flame and gas may not be discharged toward one side (+y-axis or -y-axis direction of FIG. 10) of the battery module (100) where the electrode lead (111) and the bus bar (142) are exposed. The flame and gas may be discharged to the top of the battery module (100) through a venting hole (132a, see FIG. 13) to be described later.

[0078] Fig. 11 is a plan view of a battery module (100) according to one embodiment of the present invention. Fig. 12 is an exploded perspective view showing a battery module according to one embodiment of the present invention.

[0079] Referring again to FIGS. 5, 11, and 12, a battery module (100) according to an embodiment of the present invention may include a busbar frame assembly (140) positioned on one side of a battery cell stack (120) in a direction in which an electrode lead (111) protrudes (+y-axis direction and -y-axis direction in FIG. 5). The busbar frame assembly (140) may include a busbar frame (141) and at least one busbar (142) disposed on the busbar frame (141) and connected to the electrode lead (111). The busbar frame (141) is a member for preventing the electrode lead (111) and the busbar (142) from coming into contact with other parts of the battery cell (110) and causing a short circuit, and may include an electrically insulating material. Specifically, at least one bus bar (142) may be mounted on one side of the bus bar frame (141), and the other side of the bus bar frame (141) may face the battery cell stack (120). The electrode lead (111) may pass through a slit formed in the bus bar frame (141) and then be connected to the bus bar (142).

[0080] Meanwhile, the busbar frame assembly (140) may further include a busbar frame assembly cover (150) that covers the busbar frame assembly (140). Specifically, the busbar frame assembly cover (150) may cover one surface of the busbar frame (141) on which the busbar (142) is mounted. The busbar frame assembly cover (150) may cover and insulate a plurality of busbars (142) for electrical connection of battery cells (110), terminals (not shown) of the battery module (100), and electrode leads (111) to protect them from the outside. In addition, it may prevent disassembly of the battery module (100) by unspecified persons other than the manager.

[0081] Although not shown, the busbar frame assembly cover (150) can be detachably connected to the busbar frame (141) by a hook structure. By the hook structure, the busbar frame assembly cover (150) can be fixed to the correct position of the busbar frame (141), and can be easily assembled and disassembled in a one-touch manner.

[0082] Although not shown, in order to prevent the busbar frame assembly cover (150) from moving, a rib structure of a predetermined shape may be provided on the inner wall of the busbar frame (141).

[0083] Fig. 13 is a perspective view of a battery module (100) according to one embodiment of the present invention. Fig. 14 is a plan view of a battery module (100) according to one embodiment of the present invention. Specifically, Fig. 14 shows the appearance of the battery module (100) when viewed along the -z-axis direction in the xy plane.

[0084] Referring to FIGS. 13 and 14, at least one venting hole (132a) for internal gas discharge may be formed at the upper portion of the module frame (130). For example, at least one venting hole (132a) may be formed in the upper module frame (132) of the module frame (130). Accordingly, gas inside the battery module (100) may be smoothly discharged to the outside through the venting hole (132a) formed in the module frame (130).

[0085] The number of venting holes (132a) may be one or more, and may be determined in various ways depending on the capacity of the battery cell (110), the number of battery modules (100), etc. The shape of the venting hole (132a) is not limited to the oval shape shown in the drawing.

[0086] Fig. 15 is an exploded perspective view of a battery module (100) according to one embodiment of the present invention. Fig. 16 is a perspective view of a battery module (100) according to one embodiment of the present invention. Fig. 17 is a plan view of a battery module (100) according to one embodiment of the present invention. Specifically, Fig. 17 shows a portion of a view of the battery module (100) when viewed along the -z-axis direction in the xy plane. Fig. 18 is a cross-sectional view showing a cross-section of the battery module (100) taken along the cutting line B-B' of Fig. 17.

[0087] Referring to FIGS. 15 to 18, the battery module (100) may include a module frame cover (160) that covers the upper portion of the module frame (130). For example, the module frame cover (160) may cover the upper module frame (132) of the module frame (130).

[0088] A rupture portion (161) may be formed in the module frame cover (160) so as to correspond to the vent hole (132a) and have a structure that ruptures when a certain pressure is exceeded. The rupture portion (161) is normally closed, but there are no particular restrictions on its shape as long as it ruptures when a certain pressure is exceeded, thereby inducing the discharge of internal gas. The rupture portion (161) described below is an exemplary structure that exhibits such a function.

[0089] An opening (163) may be formed in an area excluding the connecting portion (162) of the periphery of the rupture portion (161). Here, the opening (163) refers to a partially perforated portion of the module frame cover (160). The rupture portion (161) may be connected to the module frame cover (160) by the connecting portion (162). When viewed along a direction perpendicular to the upper portion of the module frame cover (160), the opening (163) may be formed outside the venting hole (132a) on the upper portion of the module frame cover (160).

[0090] When a general battery module (100) is used, the connection part (162) does not rupture. Since the opening part (163) is formed outside the venting hole (132a), in the general operating state of the battery module (100), the venting hole (132a) is blocked by the rupture part (161). When a thermal runaway phenomenon of the battery cells (110) occurs and gas is generated inside the battery module (100), the connection part (162) ruptures due to the pressure inside the battery module (100), exposing the venting hole (132a) to the outside. That is, due to the rupture of the venting hole (132a) and the connection part (162), the gas inside the battery module (100) is discharged through the hole on the module frame cover (160) formed along the shape of the opening part (163).

[0091] Accordingly, the venting hole (132a) can only function as a gas discharger when the internal pressure inside the battery module (100) increases above a certain standard due to the generation of gas due to thermal runaway of the battery cells (110). Accordingly, the stability of the battery module (100) is improved and the full performance of the battery module (100) can be secured while preventing a situation in which the internal structure of the battery module (100) is exposed to the outside, thereby lowering the stability.

[0092] According to another embodiment of the present invention, a device including at least one battery pack (1000) is provided.

[0093] The battery pack (1000) can be applied to various devices. Specifically, it can be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles, or to ESS (Energy Storage Systems), but is not limited thereto, and can be applied to various devices that can use secondary batteries.

[0094] In this example, terms indicating directions such as front, back, left, right, up, and down are used, but these terms are only for convenience of explanation and may vary depending on the location of the target object or the location of the observer.

[0095] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0096] Description of the symbol

[0097] 1000: Battery pack

[0098] 1100: Pack Frame

[0099] 1200: Bulkhead

[0100] 1300: Block

[0101] 100: Battery module

[0102] 130: Module Frame

[0103] 140: Busbar frame assembly

[0104] 160: Module frame cover

Claims

1. A battery pack comprising a plurality of battery modules and a pack frame in which the battery modules are stored, The above battery module, A battery cell stack in which a plurality of battery cells including electrode leads are stacked; and It includes a module frame in which the battery cell stack is stored; The above battery pack includes a block positioned so as to face one side of the battery module in which the electrode lead protrudes, The above block is a battery pack attached to one or both sides of a bulkhead for storing the above battery module.

2. In paragraph 1, The above block is a battery pack containing a refractory material.

3. In paragraph 1, The above battery module includes a bus bar connecting the electrode leads, A battery pack in which one side of the battery module is opened so that the electrode lead and the bus bar are exposed on the one side in the direction in which the electrode lead protrudes among the battery modules.

4. In paragraph 1, A battery pack in which one side of the battery module is in contact with the block in the direction in which the electrode lead protrudes among the battery modules.

5. In paragraph 1, The above battery module includes a busbar frame assembly positioned on one side of the battery cell stack in the direction in which the electrode lead protrudes, A battery pack comprising: a busbar frame assembly; and at least one busbar disposed on the busbar frame and connected to the electrode lead.

6. In paragraph 5, A battery pack including a busbar frame assembly cover covering the above busbar frame assembly.

7. In paragraph 1, A battery pack having at least one venting hole formed at the upper end of the module frame for internal gas discharge.

8. In paragraph 7, A battery pack including a module frame cover covering the upper portion of the module frame.

9. In paragraph 8, A battery pack having a rupture portion formed in the above module frame cover so as to correspond to the venting hole and having a structure that ruptures when a certain pressure is exceeded.

10. In paragraph 9, An opening is formed in the area excluding the connecting portion of the perimeter of the above-mentioned rupture portion, A battery pack in which the above-mentioned rupture portion is connected to the module frame cover by the above-mentioned connecting portion.

11. In paragraph 9, A battery pack in which, when viewed in a direction perpendicular to the upper portion of the module frame cover, the opening is formed outside the venting hole.

12. A device including a battery pack according to paragraph 1.

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