Battery pack

Abstract

To provide a battery pack that can smoothly discharge an exhaust generated from a battery cell, and can prevent chain ignition of the battery cell.SOLUTION: A battery pack according to the present disclosure includes a housing, a plurality of battery cells disposed inside the housing and including a vent hole, a first holder disposed inside the housing and supporting one side of the battery cell, a first connection member disposed so as to face the first holder and electrically connected to the battery cell, and a guide member included in the first connection member and guiding the flow of an exhaust discharged from the vent hole.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a battery pack. [Background technology]

[0002] Unlike primary batteries, which cannot be recharged, secondary batteries are batteries that can be charged and discharged. Low-capacity secondary batteries are used in small, portable electronic devices such as smartphones, feature phones, laptops, digital cameras, and video cameras, while high-capacity secondary batteries are widely used as motor drive power sources and power storage batteries in hybrid vehicles, electric vehicles, and the like. Such secondary batteries include an electrode assembly consisting of a positive electrode and a negative electrode, a case that houses the electrode assembly, and electrode terminals connected to the electrode assembly.

[0003] The secondary battery may be used as a battery pack formed of a number of unit battery cells connected in series and / or parallel to provide high energy density. The battery pack may be formed by connecting electrode terminals of a number of unit batteries to each other to meet the required power demand, for example, to realize a high-power secondary battery for an electric vehicle.

[0004] The information disclosed in the background of the invention above is intended to enhance understanding of the background of the invention only, and may therefore include information that does not constitute prior art. Summary of the Invention [Problem to be solved by the invention]

[0005] An object of the present invention is to provide a battery pack that can smoothly discharge waste generated from a battery cell when the battery cell catches fire and can prevent a chain reaction of fires of the battery cells.

[0006] However, the technical problems that the present invention aims to solve are not limited to the problems described above, and other problems not mentioned will be clearly understood by those skilled in the art from the description of the invention described below. [Means for solving the problem]

[0007] To solve the above technical problems, the battery pack according to the present invention includes a housing, a plurality of battery cells disposed inside the housing and having vent holes, a first holder disposed inside the housing and supporting one side of the battery cells, a first connecting member disposed opposite the first holder and electrically connected to the battery cells, and a guide member provided on the first connecting member and guiding the flow of waste discharged from the vent holes.

[0008] The first holder may include a first holder body, a plurality of first insertion holes penetrating the first holder body and into which the battery cells are inserted, and a transmission hole penetrating the first holder body, connected to the first insertion holes, and disposed to face the vent hole.

[0009] The first holder body may include a first partition wall disposed to surround the first insertion hole and a second partition wall extending from the first partition wall and disposed to surround the transmission hole, and the second partition wall may protrude to the outside of the battery cell.

[0010] The battery cell may include a cell case that houses an electrode assembly and a cap up that is coupled to the cell case and has the vent hole formed therein, and the first connecting member may include a tab body that is mounted on the first holder body and a connecting tab that extends from the tab body and is connected to the cap up.

[0011] The connection tab may include a first extension extending from the tab body and positioned to face the transmission hole, a second extension extending from the first extension and inserted into the transmission hole, and a third extension extending from the second extension and contacting the cap up.

[0012] The cap-up includes an inner body, an outer body arranged coaxially with the inner body, and a plurality of bridges arranged between the inner body and the outer body and supporting the inner body relative to the outer body, and the vent holes may be arranged between adjacent bridges.

[0013] The distance between the first holder body and the second extension portion may be greater than the distance between the first holder body and the inner body.

[0014] The length of the second extension may be 1 mm or more and 3 mm or less.

[0015] The width of the third extension may be smaller than the diameter of the inner body.

[0016] An end of the third extension may be disposed above the inner body.

[0017] The guide member may include a chamber disposed between the first holder body and the connecting tab, and a slit formed through the connecting tab and connected to the chamber and the transmission hole.

[0018] Both sides of the chamber may be open and connected to the transfer hole.

[0019] The slit may be arranged such that its longitudinal direction is aligned with the longitudinal direction of the connecting tab.

[0020] The width of the slit may be 0.8 mm or more and 1.2 mm or less.

[0021] The slits may include a first slit penetrating the first extension portion, a second slit connected to the first slit and penetrating the second extension portion, and a third slit connected to the second slit and penetrating the third extension portion.

[0022] An end of the first slit may be disposed to face the outer body.

[0023] The battery pack may further include a second holder spaced apart from the first holder and supporting the other side of the battery cell, and a protective member disposed between the first holder and the second holder and surrounding the battery cell.

[0024] The protective member may include a first protective member extending from the first holder toward the second holder, and a second protective member extending from the second holder toward the first holder and in contact with the first protective member.

[0025] The battery pack may further include a plurality of blocking members disposed to face the respective battery cells and covering the vent holes.

[0026] The blocking member may be separated from the vent hole as waste is discharged through the vent hole. [Effects of the Invention]

[0027] According to the present invention, the first connecting member has a structure that can minimize the overlapping area with the vent hole, and a guide member is formed on the first connecting member, so that waste generated from the battery cell when the battery cell catches fire can be smoothly discharged.

[0028] According to the present invention, the height of the second partition wall is arranged to be higher than the height of the vent hole, thereby preventing discharged matter from one battery cell from being transferred to an adjacent battery cell, which can lead to a chain reaction of fire among the battery cells.

[0029] According to the present invention, a protective member is installed between the first holder and the second holder to surround the side wall of the battery cell, thereby preventing a chain reaction of fires among multiple battery cells caused by the transfer of waste materials between the first holder and the second holder when the side wall of the battery cell is damaged.

[0030] According to the present invention, the blocking member can prevent waste generated when one battery cell catches fire from flowing into the vent holes of the remaining battery cells.

[0031] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects not mentioned will be clearly understood by those skilled in the art from the description of the invention described below. [Brief explanation of the drawings]

[0032] 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 concept of the present invention. Therefore, the present invention should not be interpreted as being limited only to the matters depicted in such drawings. [Figure 1] 1 is an exploded perspective view schematically showing the configuration of a battery pack according to a first embodiment of the present invention. [Figure 2] 1 is a cross-sectional view schematically showing the configuration of a battery pack according to a first embodiment of the present invention. [Figure 3] 1 is a perspective view schematically illustrating a configuration of a battery cell according to a first embodiment of the present invention. [Figure 4] 1 is a cross-sectional view schematically illustrating a configuration of a battery cell according to a first embodiment of the present invention. [Figure 5] FIG. 2 is a perspective view schematically showing the configuration of a first connecting member and a guide member according to the first embodiment of the present invention. [Figure 6] FIG. 2 is a plan view schematically showing the configuration of a first connecting member and a guide member according to the first embodiment of the present invention. [Figure 7] FIG. 2 is a front view schematically showing the configuration of a first connecting member and a guide member according to the first embodiment of the present invention. [Figure 8] FIG. 2 is a side view schematically showing the configuration of a first connecting member and a guide member according to the first embodiment of the present invention. [Figure 9] 2 is a diagram illustrating an operation process of a battery pack according to a first embodiment of the present invention; [Figure 10] 2 is a diagram illustrating an operation process of a battery pack according to a first embodiment of the present invention; [Figure 11] 10 is a diagram schematically illustrating the configuration of a battery pack according to a second embodiment of the present invention. [Figure 12] 10 is a diagram schematically illustrating an operating state of a battery pack according to a second embodiment of the present invention. [Figure 13] 10 is a diagram schematically illustrating a configuration of a battery pack according to a third embodiment of the present invention. [Figure 14] 10 is a diagram schematically illustrating an operating state of a battery pack according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0033] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Prior to this, the terms and phrases used in the specification and claims should not be construed as being limited to their ordinary or dictionary meanings, but should be interpreted in a way that is consistent with the technical concept of the present invention, based on the principle that the inventor can appropriately define the concepts of terms to best describe his or her invention. Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are merely some of the most preferred embodiments of the present invention and do not fully represent the technical concept of the present invention. Therefore, it should be understood that various equivalents and modifications may exist as of the time of filing this application. Furthermore, when used in this specification, the words "comprise," "include," and / or "comprising," "including," specify the presence of a stated shape, number, step, operation, member, element, and / or group thereof, but do not exclude the presence or addition of one or more other shapes, numbers, operations, members, elements, and / or groups. Furthermore, when describing an embodiment of the present invention, the words "may" and "may" can include "one or more embodiments of the present invention."

[0034] In addition, to facilitate understanding of the invention, the accompanying drawings may not be drawn to scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be used to refer to the same components in different embodiments.

[0035] A statement that two comparison objects are "identical" means that they are "substantially identical." Therefore, "substantially identical" can include cases where there is a deviation that is considered low in the art, for example, a deviation of 5% or less. Furthermore, "uniformity of a parameter in a given range" can mean uniformity on average.

[0036] For example, although terms such as "first," "second," etc. are used to describe various components, it is understood that these components are not limited by these terms. These terms are used merely to distinguish one component from another, and it is understood that a first component may also be a second component unless otherwise specified.

[0037] Throughout the specification, unless specifically stated to the contrary, each element may be singular or plural.

[0038] When any structure is placed "on (or under)" a component or "on (or under)" a component, it can mean not only that the structure is placed in contact with the upper surface (or lower surface) of the component, but also that other structures may be interposed between the component and any structure placed on (or under) the component.

[0039] Furthermore, when a component is described as being "coupled," "coupled," or "connected" to another component, it should be understood that the components may be directly coupled or connected to each other, or that other components may be "interposed" between the components, or that each component may be "coupled," "coupled," or "connected" through other components. Furthermore, when a part is said to be electrically coupled to another part, this includes not only direct coupling, but also coupling via an intermediate element.

[0040] Throughout the specification, when "A and / or B" is used, this means A only, B only, or A and B, unless specifically stated to the contrary. That is, "and / or" includes all or any combination of the listed items. When "C through D" is used, this means at least C and at most D, unless specifically stated to the contrary.

[0041] When syntax such as "at least one of A, B and C," "at least one of A, B or C," "at least one selected from the group A, B and C," or "at least one selected from A, B and C" is used to specify a list of elements A, B and C, the syntax can refer to any and all compatible combinations.

[0042] The term "use" may be considered synonymous with the term "utilize." As used herein, the terms "substantially," "about," and similar terms are used as terms of approximation, rather than terms of degree, and are intended to account for inherent variations in measured or calculated values ​​that one of ordinary skill in the art would recognize.

[0043] In this specification, terms such as first, second, and third may be used to describe various elements, components, regions, layers, and / or sections, but these elements, components, regions, layers, and / or sections should not be limited by these terms. These terms are used to distinguish one element, component, region, drawing layer, or cross section from another element, component, region, drawing layer, or cross section. Thus, a first element, component, region, layer, or section discussed below could be named a second element, component, region, layer, or section without departing from the teachings of the exemplary embodiments.

[0044] For ease of description, spatially relative terms such as "beneath," "below," "lower," "above," "upper," etc. may be used herein to describe the relationship of one element or feature to other element(s) or feature(s) as illustrated in the drawings. Spatially relative positions will be understood to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the drawings is turned over, elements described as "beneath" or "below" other elements would be understood as "above" or "upper" of the other elements. Thus, the term "below" can encompass both an orientation of above and below.

[0045] The terminology used herein is for the purpose of describing embodiments of the present disclosure and is not intended to limit the present disclosure.

[0046] In the following description of the present invention using multiple embodiments, the same or corresponding components will not be described repeatedly across multiple embodiments. For example, if a component that is the same or corresponding to a component disclosed in one embodiment is disclosed in another embodiment, the corresponding component will be omitted from the description of the other embodiment, and the components that are different from the first embodiment will be mainly described.

[0047] FIG. 1 is an exploded perspective view schematically showing the configuration of a battery pack according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view schematically showing the configuration of a battery pack according to the first embodiment of the present invention.

[0048] 1 and 2, the battery pack according to this embodiment includes a housing 100, a battery cell 200, a first holder 300, a first connecting member 400, and a guide member 500.

[0049] The housing 100 forms the general appearance of the battery pack and can provide a space in which the battery cells 200 can be housed.

[0050] The housing 100 may include a housing body 110 and a cover 120 .

[0051] The housing body 110 may be formed in the shape of a box with an open interior and one side open. The open side of the housing body 110 may be disposed facing upward. The cross-sectional shape of the housing body 110 is not limited to the square shown in FIG. 1, but may be modified to various shapes such as a polygon, a circle, an ellipse, etc.

[0052] The cover 120 may be coupled to the housing body 110 to close the interior space of the housing body 110. For example, the cover 120 may be formed to have a generally plate shape and disposed to face the open side of the housing body 110, i.e., the upper side of the housing body 110. The cover 120 may be fixed to the housing body 110 by various coupling methods such as bolting, welding, or fitting. The thickness of the cover 120 may be the same as that of the housing body 110.

[0053] The battery cell 200 can function as a unit structure that stores and supplies power in a battery pack.

[0054] In the following description, the battery cell 200 will be described as a cylindrical lithium-ion secondary battery, but the present invention is not limited thereto, and the battery cell 200 may be a lithium polymer battery or a prismatic battery.

[0055] FIG. 3 is a perspective view schematically showing the configuration of a battery cell according to a first embodiment of the present invention, and FIG. 4 is a cross-sectional view schematically showing the configuration of a battery cell according to the first embodiment of the present invention.

[0056] Referring to FIGS. 3 and 4 , the battery cell 200 may include a cell casing 210 , an electrode assembly 220 , and a cap assembly 230 .

[0057] Cell casing 210 may include a generally circular bottom 211 and a sidewall 212 extending a certain length upward from bottom 211. Cell casing 210 may be made of steel, a steel alloy, nickel-plated steel, a nickel-plated steel alloy, aluminum, or an aluminum alloy.

[0058] During the manufacturing process of the battery cell 200, the top of the cell casing 210 may be opened. Therefore, during the assembly process of the battery cell 200, the electrode assembly 220 may be integrated into a single structure and inserted into the cell casing 210. Thereafter, an electrolyte may be additionally injected into the cell casing 210.

[0059] A beading part 213 recessed in the central axis direction of the cap assembly 230 may be formed on the upper side of the cell casing 210 to prevent the cap assembly 230 from coming off to the outside. The beading part 213 may be disposed at the bottom of the cap assembly 230. A crimping part 214 bent to surround the edge of the cap assembly 230 may be formed on the top of the beading part 213.

[0060] The electrode assembly 220 may be housed inside the cell casing 210. The electrode assembly 220 may include or be referred to as an electrode, an electrode group, or a jelly roll. The electrode assembly 220 may include a negative electrode plate 221 coated with a negative electrode active material (e.g., graphite, carbon, etc.), a positive electrode plate 222 coated with a positive electrode active material (e.g., a transition metal oxide (LiCoO2, LiNiO2, LiMn2O4, etc.)), and a separator 223 positioned between the negative electrode plate 221 and the positive electrode plate 222 to prevent short circuits and allow only the movement of lithium ions. The negative electrode plate 221, the positive electrode plate 222, and the separator 223 may be wound into a generally cylindrical shape. In some examples, the negative electrode plate 221 may be copper (Cu) foil, the positive electrode plate 222 may be aluminum (Al) foil, and the separator 223 may be polyethylene (PE) or polypropylene (PP).

[0061] A negative electrode tab 224 may be welded to the negative electrode plate 221. The negative electrode tab 224 may extend to protrude a certain length from the bottom of the electrode assembly 220. A positive electrode tab 225 may be welded to the positive electrode plate 222. The positive electrode tab 225 may extend to protrude a certain length from the top of the electrode assembly 220. The negative electrode tab 224 may be made of copper (Cu) or nickel (Ni), and the positive electrode tab 225 may be made of aluminum (Al).

[0062] The negative electrode tab 224 may be welded to the bottom 211 of the cell casing 210. Thus, the cell casing 210 may operate as a negative electrode. In some examples, the negative electrode tab 224 may be ultrasonically or laser welded to the bottom 211 of the cell casing 210. Of course, the opposite may also be true, with the positive electrode tab 225 welded to the bottom 211 of the cell casing 210, in which case the cell casing 210 may operate as a positive electrode.

[0063] The electrode assembly 220 may further include a center pin 240. The center pin 240 may be in the form of a hollow circular pipe and may be attached to approximately the center of the electrode assembly 220. The center pin 240 may be made of steel, stainless steel, aluminum, an aluminum alloy, or polybutylene terepthalate, but the material is not limited thereto. The center pin 240 may suppress deformation of the electrode assembly 220 during charging and discharging of the secondary battery. The center pin 240 may function as a passage for gas generated inside the secondary battery. In some cases, the center pin 240 may be omitted.

[0064] The cap assembly 230 can seal the opening of the cell casing 210 and protect the electrode assembly 220 from the external environment. If the internal pressure of the cell casing 210 rises above the reference pressure due to thermal runaway or ignition of the battery cell 200, the cap assembly 230 can rupture and release the internal gas of the cell casing 210 to the outside. In some examples, the cap assembly 230 may serve as a positive electrode terminal.

[0065] The cap assembly 230 may include a cap up 231 , a vent plate 232 , and a cap down 233 .

[0066] The cap 231 can serve as a terminal for electrically connecting to an external device, and in some examples, the cap 231 can serve as a positive terminal.

[0067] A vent hole V may be formed in the cap up 231. The vent hole V may serve to release internal gas to the outside when abnormal internal pressure occurs due to overcharging or the like inside the cell casing 210. The cap up 231 may be made of aluminum or an aluminum alloy.

[0068] As an example, the cap-up 231 can include an inner body 231a, an outer body 231b, and a bridge 231c.

[0069] The inner body 231a may form the exterior of the central portion of the cap up 231. As an example, the inner body 231a may be formed to have a substantially circular plate shape. The inner body 231a may be disposed so that its central axis coincides with the central axis C of the cell casing 210.

[0070] The outer body 231b can form the outer appearance of the edge of the cap up 231. As an example, the outer body 231b can be formed to have a substantially hollow ring shape. The diameter of the outer body 231b can be formed to be larger than the diameter of the inner body 231a. The outer body 231b can be arranged coaxially with the inner body 231a. That is, the central axis of the outer body 231b can be arranged to coincide with the central axis C of the inner body 231a and the cell casing 210.

[0071] The inner body 231a and the outer body 231b may be arranged to be spaced apart from each other vertically. For example, the outer body 231b may be arranged below the inner body 231a. Alternatively, the inner body 231a and the outer body 231b may be arranged on the same plane.

[0072] The bridge 231c is disposed between the inner body 231a and the outer body 231b and can support the inner body 231a relative to the outer body 231b. The bridge 231c can be formed in a rod shape with both ends connected to the outer peripheral surface of the inner body 231a and the inner peripheral surface of the outer body 231b, respectively. A plurality of bridges 231c can be provided. The plurality of bridges 231c can be arranged at set intervals along a circumference centered on the central axis C of the cell casing 210. The intervals between adjacent bridges 231c can be the same.

[0073] The vent holes V may be formed in the form of holes penetrating the cap 231. For example, the vent holes V may be formed in the form of holes penetrating the region between the inner body 231a and the outer body 231b. A plurality of vent holes V may be provided. The plurality of vent holes V may be individually disposed between adjacent bridges 231c. For example, the number of vent holes V is not limited to that shown in FIG. 3 and may be variously varied.

[0074] The vent plate 232 may be positioned at the bottom of the cap up 231. The vent plate 232 may be in close contact with, bonded to, or connected to the bottom of the cap up 231. For example, the vent plate 232 may be in close contact with, bonded to, or connected to the edge of the cap up 231, i.e., the outer body 231b, excluding the center portion protruding upward from the cap up 231, i.e., the inner body 231a. The end of the vent plate 232 may be curved and extended to surround the end of the outer body 231b. The vent plate 232 may be made of aluminum or an aluminum alloy.

[0075] The vent plate 232 may include a notch 232a. The notch 232a may be recessed to a certain depth from the outer surface of the vent plate 232.

[0076] When the internal pressure of the battery cell 200 rises above a reference pressure (or the rupture pressure of the vent plate 232) due to thermal runaway or ignition of the battery cell 200, the notch 232a is ruptured, and emissions generated inside the cell casing 210 may be discharged to the outside by sequentially passing through the notch 232a and the vent hole V. Here, the emissions discharged from the vent hole V may include at least one of flame, gas, and smoke.

[0077] The cap down 233 may be disposed below the vent plate 232. The cap down 233 may be in close contact with, connected to, or bonded to the vent plate 232. The cap down 233 may be electrically connected to the electrode assembly 220 through the positive electrode tab 225. The cap down 233 may be electrically connected to the vent plate 232 and the cap up 231. The positive electrode tab 225 of the electrode assembly 220 may be welded to the lower surface of the cap down 233. In some examples, the lower surface of the cap down 233 may be ultrasonically and / or laser welded to the positive electrode tab 225. In some examples, the cap down 233 may be made of aluminum or an aluminum alloy.

[0078] In some examples, in the event of thermal runaway or fire of the battery cell 200, the vent plate 232 may be deformed by the internal pressure of the cell casing 210, and the cap down 233 and the vent plate 232 may be electrically isolated.

[0079] A first insulating member 234 may be installed between the vent plate 232 and the cap down 233. The first insulating member 234 may be located between an edge of the vent plate 232 and an edge of the cap down 233. The first insulating member 234 may serve to insulate between the cap down 233 and the vent plate 232 when the vent plate 232 is deformed by the internal gas. In some examples, the first insulating member 234 may be formed of a resin material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc., but the material is not limited thereto.

[0080] A second insulating member 235 may be installed on the upper side of the cell casing 210. The second insulating member 235 may be located between the cell casing 210 and an end of the vent plate 232 surrounding the outer body 231b of the cap assembly 231. Both sides of the second insulating member 235 may be closely attached to the end of the vent plate 232 and the inner surfaces of the crimping portion 214 and the beading portion 213, respectively. The second insulating member 235 may serve to provide insulation between the cell casing 210 and the cap assembly 230. The second insulating member 235 may be made of a resin material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc., but the material is not limited thereto.

[0081] The battery cell 200 may be disposed inside the housing 100. As an example, the battery cell 200 may be disposed in the interior space of the housing body 110. The battery cell 200 may be disposed such that the bottom 211 faces the bottom surface of the housing body 110 and the vent hole V faces the cover 120. However, the battery cell 200 is not limited thereto, and may also be disposed such that the bottom 211 faces the cover 120 and the vent hole V faces the bottom surface of the housing body 110.

[0082] A plurality of battery cells 200 may be provided. The plurality of battery cells 200 may be arranged side by side inside the housing 100. The plurality of battery cells 200 may be arranged in various patterns inside the housing 100, such as a grid pattern or a zigzag pattern. The number of battery cells 200 may be variously designed depending on the size of the housing 100, etc.

[0083] The first holder 300 is disposed inside the housing 100 and can support one side of the plurality of battery cells 200. The first holder 300 can function as a component that maintains a constant distance between the plurality of battery cells 200.

[0084] The first holder 300 may include a first holder body 310 , a first insertion hole 320 , and a transmission hole 330 .

[0085] The first holder body 310 may be formed to have a substantially plate shape. For example, the first holder body 310 may be placed on the upper surface of the battery cell 200 in which the vent hole V is formed.

[0086] The first insertion hole 320 may provide a space into which one side of the battery cell 200 is inserted inside the first holder body 310. For example, the first insertion hole 320 may be recessed upward from the lower surface of the first holder body 310. The cross-sectional area of ​​the first insertion hole 320 may be larger than the cross-sectional area of ​​the battery cell 200. The upper end of the battery cell 200 on which the cap assembly 230 is formed may be inserted into the first insertion hole 320.

[0087] A plurality of first insertion holes 320 may be provided. The plurality of first insertion holes 320 may be arranged to be spaced apart from each other inside the first holder body 310. The upper ends of the plurality of battery cells 200 may be individually inserted into different first insertion holes 320.

[0088] The transmission hole 330 may function as a component for transmitting waste discharged from the vent hole V in the first holder body 310 to the internal space of the housing 100. The transmission hole 330 may be recessed downward from the upper surface of the first holder body 310. The lower surface of the transmission hole 330 may be connected to the upper surface of the first insertion hole 320. Accordingly, the first insertion hole 320 and the transmission hole 330 may have a shape that continuously penetrates the first holder body 310 in the up-down direction.

[0089] The transmission hole 330 may be disposed to face the vent hole V of the battery cell 200 inserted into the first insertion hole 320. Accordingly, waste discharged from the vent hole V may be transmitted to the external space of the housing 100 through the transmission hole 330.

[0090] The cross-sectional area of ​​the transmission hole 330 may be smaller than the cross-sectional area of ​​the first insertion hole 320. Accordingly, the upper end of the battery cell 200 inserted into the first insertion hole 320 may not protrude upward from the first holder body 310 through the transmission hole 330. The diameter of the transmission hole 330 may be 13 mm.

[0091] A plurality of the communication holes 330 may be provided, and the plurality of communication holes 330 may be disposed at positions facing the first insertion holes 320 and the vent holes V, respectively.

[0092] The first holder body 310 may include a first partition 311 and a second partition 312 .

[0093] The first partition 311 may form the exterior of one side of the first holder body 310 and may be disposed to surround the first insertion hole 320. That is, the first partition 311 may refer to a lower region of the first holder body 310 that surrounds the first insertion hole 320 among the entire region of the first holder body 310. The first partition 311 may be inserted into a space between adjacent battery cells 200. Accordingly, the first partition 311 may maintain a constant distance between adjacent battery cells 200.

[0094] The second partition 312 may form the exterior of the other side of the first holder body 310 and may be disposed to surround the transmission hole 330. That is, the second partition 312 may refer to the upper region of the first holder body 310 that surrounds the transmission hole 330 among the entire region of the first holder body 310.

[0095] The second partition wall 312 may protrude outward from the battery cell 200. That is, the second partition wall 312 may be disposed at a position higher than the vent hole V. The cross-sectional area of ​​the transfer hole 330 may be smaller than the cross-sectional area of ​​the first insertion hole 320, so that the second partition wall 312 may be disposed on the upper surface of the battery cell 200. The second partition wall 312 may function as a blocking wall that blocks a path from which waste discharged from the vent hole V of one battery cell 200 flows into the vent hole V of an adjacent battery cell 200. Accordingly, the second partition wall 312 may prevent a chain reaction of fires among the battery cells 200.

[0096] The first connecting member 400 may be disposed opposite the first holder 300 and may be electrically connected to the battery cell 200. The first connecting member 400 may function as a component that connects the plurality of battery cells 200 disposed inside the housing 100 to each other in series or parallel.

[0097] Figure 5 is a perspective view schematically showing the configuration of the first connecting member and guide member according to the first embodiment of the present invention, Figure 6 is a plan view schematically showing the configuration of the first connecting member and guide member according to the first embodiment of the present invention, Figure 7 is a front view schematically showing the configuration of the first connecting member and guide member according to the first embodiment of the present invention, and Figure 8 is a side view schematically showing the configuration of the first connecting member and guide member according to the first embodiment of the present invention.

[0098] Referring to FIGS. 1-8, the first connecting member 400 may include a tab body 410 and a connecting tab 420 .

[0099] The tab body 410 may be mounted on the first holder body 310 and support the connection tab 420. The tab body 410 may be formed to have a generally plate shape and may be mounted on the upper surface of the first holder body 310. The tab body 410 may be fixed to the upper surface of the first holder body 310 by various types of coupling methods such as welding, adhesive bonding, bolting, and fitting. The tab body 410 may have a shape that does not directly face the transmission hole 330 formed through the first holder body 310.

[0100] The tab body 410 may be formed of an electrically conductive material such as copper, nickel, aluminum, etc. The tab body 410 may be electrically connected to an external terminal of the battery pack. The tab body 410 may function as a component that collects power transmitted from a connecting tab 420 (described later) and transmits the power to the external terminal of the battery pack, and distributes the power transmitted from the external terminal of the battery pack to the connecting tab 420.

[0101] The tab body 410 may be formed in a plurality of pieces, or alternatively, may be formed as a single piece. When the tab body 410 is formed in a plurality of pieces, the plurality of tab bodies 410 may be electrically connected to each other.

[0102] The connection tab 420 may extend from the tab body 410 and be connected to the cap up 231 of the battery cell 200. A plurality of connection tabs 420 may be provided. The plurality of connection tabs 420 may extend from the tab body 410 toward different battery cells 200 and be individually connected to the cap up 231 of the different battery cells 200. As the cap up 231 serves as a positive electrode terminal, the first connection member 400 may function as a component that electrically connects the positive electrodes of the battery cells 200 to each other.

[0103] The connection tab 420 may include a first extension 421 , a second extension 422 , and a third extension 423 .

[0104] The first extension 421 extends from the tab body 410 and can fully support the second extension 422 and the third extension 423, which will be described later. The end of the first extension 421 can be arranged to face the transmission hole 330 from above and below. The longitudinal direction of the first extension 421 can be arranged parallel to the tab body 410.

[0105] The second extension portion 422 may extend from the first extension portion 421 toward the transmission hole 330. As an example, the second extension portion 422 may extend downward from an end of the first extension portion 421 and be inserted into the transmission hole 330. The longitudinal direction of the second extension portion 422 may be disposed so as to intersect with the longitudinal direction of the first extension portion 421. As an example, the longitudinal direction of the second extension portion 422 may be disposed perpendicular to the first extension portion 421.

[0106] The third extension 423 may extend from the second extension 422 and contact the cap up 231. For example, the third extension 423 may extend from an end of the second extension 422 in a direction parallel to the longitudinal direction of the first extension 421. A lower surface of the third extension 423 may contact an upper surface of the inner body 231a of the cap up 231. The third extension 423 may be fixed to the inner body 231a by various joining methods such as welding, fitting, bolting, etc.

[0107] The first extension portion 421, the second extension portion 422, and the third extension portion 423 may have a structure that can minimize the area facing the vent hole V so that waste can be smoothly discharged from the vent hole V.

[0108] For example, the distance L1 between the first holder body 310 and the second extension portion 422 may be greater than the distance L2 between the first holder body 310 and the inner body 231a. Here, the distance L1 between the first holder body 310 and the second extension portion 422 may refer to the distance between the first partition wall 311 and the inner surface of the second extension portion 422, and the distance L2 between the first holder body 310 and the inner body 231a may refer to the distance between the first partition wall 311 and the outer circumferential surface of the inner body 231a. Accordingly, the lower end of the second extension portion 422 is positioned so as not to directly face the vent hole V, thereby preventing interference with waste discharged from the vent hole V.

[0109] The length L of the second extension 422 a The length L of the second extension 422 can be 1 mm or more and 3 mm or less. a If the length L of the second extension 422 is less than 1 mm, the installation space of the guide member 500 described later may become excessively narrow. a If the thickness is greater than 3 mm, the thickness of the first holder body 310 or the tub body 410 may increase excessively, reducing the overall energy density.

[0110] The width W1 of the third extension 423 may be smaller than the diameter W2 of the inner body 231a. The end of the third extension 423 may be disposed on the inner body 231a. Accordingly, the third extension 423 does not protrude outside the inner body 231a, and therefore does not directly face the vent hole V disposed outside the inner body 231a.

[0111] The guide member 500 is provided on the first connecting member 400 and can guide the flow of waste discharged from the vent hole V. That is, the guide member 500 can function as a component that provides a path through which waste discharged from the vent hole V can be smoothly discharged to the outside of the transfer hole 330 without interfering with the first connecting member 400.

[0112] The guide member 500 may include a chamber 510 and a slit 520 .

[0113] The chamber 510 may be disposed between the first holder body 310 and the connecting tab 420. As an example, the chamber 510 may refer to a space surrounded by the second partition wall 312, the first extension portion 421, and the second extension portion 422 within the internal space of the first holder body 310 facing the vent hole V. A lower surface of the chamber 510 may face the vent hole V and be connected to the vent hole V. Accordingly, the flow of waste discharged from the vent hole V may flow into the chamber 510 without being blocked by the connecting tab 420.

[0114] Both sides of the chamber 510 spaced apart in the width direction of the connecting tab 420 may be open. The chamber 510 may be connected to the transfer hole 330 through both open sides. Accordingly, the waste flowing into the chamber 510 may be transferred to the transfer hole 330 through both sides of the chamber 510.

[0115] The slit 520 may be formed through the connection tab 420. The slit 520 may function as a component that provides a path for the waste material flowing into the chamber 510 in the connection tab 420 to be transferred to the transfer hole 330. Accordingly, the waste material flowing into the chamber 510 may be smoothly transferred to the transfer hole 330 through both sides of the chamber 510 and the slit 520.

[0116] The longitudinal direction of the slit 520 may be aligned with the longitudinal direction of the connecting tab 420. Here, the longitudinal direction of the connecting tab 420 does not refer to any one direction, but may refer to a direction aligned with the direction of continuous extension from the first extension 421 to the second extension 422 and the third extension 423. In other words, the slit 520 may have different sections that penetrate the first extension 421, the second extension 422, and the third extension 423, and each section of the slit 520 may be aligned with the extension direction of the first extension 421, the second extension 422, and the third extension 423.

[0117] As an example, the slits 520 may include a first slit 521 , a second slit 522 , and a third slit 523 .

[0118] The first slit 521 may have the form of a hole penetrating the first extension portion 421. One end of the first slit 521 may be located in a boundary region between the first extension portion 421 and the second extension portion 422. The other end of the first slit 521 may extend from one end of the first slit 521 along the extension direction of the first extension portion 421. Here, the extension direction of the first extension portion 421 may be aligned with the radial direction of the inner body 231a. The other end of the first slit 521 may be disposed to face the upper surface of the outer body 231b. Accordingly, the length of the first slit 521 aligned with the extension direction of the first extension portion 421 may be greater than the length of the vent hole V aligned with the extension direction of the first extension portion 421. The first slit 521 may be disposed to directly face the vent hole V in the vertical direction, or may be disposed offset from the vent hole V.

[0119] The second slit 522 may have the form of a hole penetrating the second extension portion 422. One end of the second slit 522 may be located in a boundary region between the first extension portion 421 and the second extension portion 422 and may be connected to the first slit 521. The other end of the second slit 522 may extend from one end of the second slit 522 along the extension direction of the second extension portion 422. The other end of the second slit 522 may be located in a boundary region between the second extension portion 422 and the third extension portion 423.

[0120] The third slit 523 may have the form of a hole penetrating the third extension portion 423. One end of the third slit 523 may be located in a boundary region between the second extension portion 422 and the third extension portion 423 and may be connected to the second slit 522. The other end of the third slit 523 may extend from one end of the third slit 523 along the extension direction of the third extension portion 423. The other end of the third slit 523 may penetrate an end of the third extension portion 423. Accordingly, the third extension portion 423 may have a form divided into two parts on both sides based on the third slit 523.

[0121] Slit width W of 520 S The width W of the slit 520 can be 0.8 mm or more and 1.2 mm or less. S If the width W of the slit 520 is smaller than 0.8 mm, the discharged matter flowing into the chamber 510 may not be able to pass through the slit 520 smoothly. S If the width W of the connecting tab 420 is smaller than 1.2 mm, the width of the connecting tab 420 may be excessively reduced, and power may not be smoothly transmitted between the tab body 410 and the battery cell 200. The widths of the first slit 521, the second slit 522, and the third slit 523 may all be formed to be the same. For example, the widths of the first slit 521, the second slit 522, and the third slit 523 may be set to be equal to the width W of the slit 520. S It can be formed identically to the above.

[0122] The battery pack according to this embodiment may further include a second holder 600 and a second connecting member 700.

[0123] The second holder 600 is spaced apart from the first holder 300 and can support the other side of the plurality of battery cells 200. The second holder 600, together with the first holder 300, can function as a component that maintains a constant distance between the plurality of battery cells 200.

[0124] The second holder 600 can include a second holder body 610 and a second insertion hole 620 .

[0125] The second holder body 610 may be formed to have a substantially plate shape. The second holder body 610 may be disposed between the bottom surface of the housing body 110 and the bottom portion 211 of the battery cell 200. The upper and lower surfaces of the second holder body 610 may be placed on the bottom portion 211 of the battery cell 200 and the bottom surface of the housing body 110, respectively.

[0126] The second insertion hole 620 may provide a space into which the other side of the battery cell 200 is inserted inside the second holder body 610. For example, the second insertion hole 620 may be recessed downward from an upper surface of the second holder body 610. The cross-sectional area of ​​the second insertion hole 620 may be larger than the cross-sectional area of ​​the battery cell 200. The lower end of the battery cell 200 may be inserted into the second insertion hole 620.

[0127] A plurality of second insertion holes 620 may be provided. The plurality of second insertion holes 620 may be arranged to be spaced apart from each other inside the second holder body 610. The lower ends of the plurality of battery cells 200 may be individually inserted into different second insertion holes 620.

[0128] The second connecting member 700 is disposed to face the second holder 600 and can be electrically connected to the battery cell 200. The second connecting member 700 can function as a component that connects the plurality of battery cells 200 disposed inside the housing 100 to each other in series or in parallel.

[0129] For example, the second connecting member 700 may be placed on the lower surface of the second holder body 610. The second connecting member 700 may be fixed to the lower surface of the second holder body 610 by various types of connection methods such as welding, adhesive bonding, bolting, and fitting. The second connecting member 700 may be made of an electrically conductive material such as copper, nickel, aluminum, etc.

[0130] One side of the second connecting member 700 may be electrically connected to the bottoms 211 of the plurality of cell casings 210. As the cell casings 210 serve as negative electrode terminals, the second connecting member 700 may function as a component that electrically connects the negative electrodes of the battery cells 200 to each other. The other side of the second connecting member 700 may be electrically connected to an external terminal of the battery pack.

[0131] The operation of the battery pack according to this embodiment will be described below.

[0132] 9 and 10 are diagrams schematically illustrating an operation process of the battery pack according to the first embodiment of the present invention.

[0133] 9 and 10, when the battery cell 200 experiences thermal runaway or catches fire, emissions such as flames, gas, and smoke generated inside the battery cell 200 are discharged to the outside of the battery cell 200 through the vent hole V.

[0134] Among the plurality of vent holes (V), the waste discharged from the vent holes (V) that do not directly face the connecting tabs (420) is directly transmitted to the transmission holes (330) and is discharged to the outside of the first holder (300) through the transmission holes (330).

[0135] The air flows into the chamber 510 through the vent hole V that is discharged from the vent hole V facing the connecting tab 420 among the plurality of vent holes V.

[0136] The waste matter flowing into the chamber 510 can be smoothly transferred to the transfer hole 330 through the open sides of the chamber 510 and the slit 520 and then discharged to the outside of the first holder 300 through the transfer hole 330 .

[0137] During this process, since the second partition wall 312 is positioned higher than the vent hole V, the waste discharged from the vent hole V of any one battery cell 200 can be discharged outside the first holder 300 without flowing into the vent hole V of the adjacent battery cell 200.

[0138] A battery pack according to a second embodiment of the present invention will be described below.

[0139] FIG. 11 is a diagram schematically illustrating the configuration of a battery pack according to a second embodiment of the present invention.

[0140] Referring to FIG. 11, the battery pack according to this embodiment may be configured to further include a protection member 800 in addition to the battery pack according to the first embodiment of the present invention.

[0141] The protective member 800 may be disposed between the first holder 300 and the second holder 600. The protective member 800 may be disposed to surround the battery cells 200, more specifically, the sidewalls 212 of the battery cells 200. That is, the protective member 800 may function as a component that blocks the transmission of exhaust gas between the sidewalls 212 of adjacent battery cells 200 when the battery cells 200 catch fire. Accordingly, the protective member 800 may prevent chain fires of the battery cells 200 due to damage or penetration of the sidewalls 212 of the battery cells 200.

[0142] A plurality of protective members 800 may be provided, and the plurality of protective members 800 may be individually disposed between each pair of adjacent battery cells 200.

[0143] The protective member 800 can include a first protective member 810 and a second protective member 820 .

[0144] The first protective member 810 may extend from the first holder 300 toward the second holder 600. As an example, the first protective member 810 may have the form of a partition extending from the lower end of the first holder body 310, i.e., the lower end of the first partition 311, toward the upper end of the second holder body 610. The first protective member 810 may be formed integrally with the first holder body 310, or alternatively, may be manufactured as a separate member from the first holder body 310 and then inserted between the first holder 300 and the second holder 600.

[0145] The second protective member 820 may extend from the second holder 600 toward the first holder 300. For example, the second protective member 820 may have the form of a partition extending from an upper end of the second holder body 610 toward a lower end of the first holder body 310. The upper end of the second protective member 820 may contact a lower end of the first protective member 810. Accordingly, the first protective member 810 and the second protective member 820 may seal the space between the sidewall portions 212 of adjacent battery cells 200.

[0146] The second protective member 820 may be formed integrally with the second holder body 610, or alternatively, it may be manufactured as a separate item from the second holder body 610 and then inserted between the first holder 300 and the second holder 600.

[0147] The first protective member 810 and the second protective member 820 may include a synthetic resin, a ceramic material, or the like, which has insulating and heat-resistant properties.

[0148] The operation of the battery pack according to this embodiment will be described below.

[0149] FIG. 12 is a diagram schematically illustrating an operating state of a battery pack according to a second embodiment of the present invention.

[0150] Referring to FIG. 12, when the battery cell 200 catches fire, the cell casing 210 may be damaged due to an excessive increase in internal pressure of the cell casing 210 or an external impact.

[0151] For example, if the side wall portion of the cell casing 210 is torn or a through hole is formed in the cell casing 210, emissions such as flames, gas, smoke, etc. may be discharged to the outside of the battery cell 200 through the side wall portion 212 of the battery cell 200 rather than through the vent hole V.

[0152] In this case, the waste discharged from the sidewall 212 of any one battery cell 200 may flow toward the adjacent battery cell 200.

[0153] However, by disposing the first protective member 810 and the second protective member 820 between adjacent battery cells 200, the flow of waste material discharged from the side wall portion 212 of any one battery cell 200 is blocked by the first protective member 810 and the second protective member 820, and can be prevented from being transmitted to the adjacent battery cell 200.

[0154] Accordingly, the temperature rise of the battery cells 200 adjacent to the ignited battery cell 200 is suppressed, and a chain reaction of ignition of the battery cells 200 can be prevented.

[0155] A battery pack according to a third embodiment of the present invention will be described below.

[0156] FIG. 13 is a diagram schematically illustrating the configuration of a battery pack according to a third embodiment of the present invention, and FIG. 14 is a diagram schematically illustrating the operating state of the battery pack according to the third embodiment of the present invention.

[0157] 13 and 14, the battery pack according to this embodiment may be configured to further include a blocking member 900 in addition to the battery pack according to the first or second embodiment of the present invention.

[0158] 13 and 14 illustrate an example of a battery pack according to this embodiment that includes a protective member 800, but the battery pack according to this embodiment can also be configured not to include a protective member 800.

[0159] The blocking member 900 may be disposed to face the battery cell 200 and cover the vent hole V. A plurality of blocking members 900 may be provided. The plurality of blocking members 900 may be disposed to individually cover the vent holes V of different battery cells 200.

[0160] The blocking member 900 can close the vent hole V when the battery cell 200 is operating normally. Accordingly, when one battery cell 200 catches fire, the blocking member 900 can block waste discharged from the corresponding battery cell 200 from flowing into the vent hole V of the adjacent battery cell 200.

[0161] The blocking member 900 may include an insulating, heat-resistant, and fire-resistant material, such as silicon, polystyrene, polyurethane, polyethylene, vinyl chloride, or a ceramic material.

[0162] The blocking member 900 may be fabricated in the form of a sheet and then attached onto the cap assembly 230 of the battery cell 200. Alternatively, the blocking member 900 may be applied in a liquid state onto the cap assembly 230 of the battery cell 200 and then cured.

[0163] When the battery cell 200 ignites, the blocking member 900 may be separated from the vent hole V due to the pressure of the waste discharged from the vent hole V, thereby opening the vent hole V. The area of ​​the blocking member 900 may be smaller than the area of ​​the transmission hole 330. Accordingly, when the battery cell 200 ignites, the blocking member 900 may be easily detached to the outside of the transmission hole 330.

[0164] Although the present invention has been described with reference to the embodiments illustrated in the drawings, this is by way of example only, and those skilled in the art will recognize that various modifications and equivalent alternative embodiments are possible.

[0165] Therefore, the technical protection scope of the present invention should be defined by the following claims. [Explanation of symbols]

[0166] 100: Housing 110: Housing body 120:Cover 200: Battery cells 210: Cell case 211: Bottom 212: Side wall 213: Beading section 214: Crimping section 220: Electrode assembly 221: Negative electrode plate 222: Positive electrode plate 223: Separator 224: Negative electrode tab 225: Positive electrode tab 230: Cap assembly 231: Cap Up 231a: Inner Body 231b: Outer body 231c:Bridge 232: Bent plate 232a:Notch 233: Cap Down 234: First insulating member 235: Second insulating member 240: Center pin 300: First holder 310: First holder body 311: First bulkhead 312: Second bulkhead 320: First insertion hole 330: Transmission Hall 400: First connecting member 410: Tab body 420: Connecting tab 421: First extension 422: Second extension 423: Third Extension 500: Guide member 510: Chamber 520: Slit 521: First slit 522: Second slit 523: Third Slit 600: Second holder 610: Second holder body 620: Second insertion hole 700: Second connecting member 800: Protective materials 810: First protective member 820: Second protective member 900: Blocking member C: central axis of cell case 210 L1: the distance between the first holder body 310 and the second extension 422 L2: distance between the first holder body 310 and the inner body 231a L a : Length of the second extension 422 V: Vent hole W1: Width of the third extension 423 W2: diameter of inner body 231a W S :Slit width 520

Claims

1. Housing and a plurality of battery cells disposed inside the housing and having vent holes; a first holder disposed inside the housing and supporting one side of the battery cell; a first connecting member disposed opposite the first holder and electrically connected to the battery cell; a guide member provided on the first connecting member to guide a flow of waste discharged from the vent hole.

2. The first holder includes: a first holder body; a plurality of first insertion holes penetrating the first holder body and into which the battery cells are inserted; The battery pack according to claim 1 , further comprising: a transmission hole that penetrates the first holder body, is connected to the first insertion hole, and is disposed opposite the vent hole.

3. The first holder body includes: a first partition wall disposed to surround the first insertion hole; a second partition wall extending from the first partition wall and disposed to surround the transfer hole; The battery pack according to claim 2 , wherein the second partition wall protrudes to the outside of the battery cell.

4. The battery cell a cell case that houses the electrode assembly; a cap-up coupled to the cell casing and having the vent hole formed therein; The first connecting member includes: a tub body placed on the first holder body; The battery pack according to claim 3 , further comprising: a connecting tab extending from the tab body and connected to the cap.

5. The connecting tab a first extension extending from the tab body and positioned opposite the transmission hole; a second extension extending from the first extension and inserted into the transmission hole; 5. The battery pack according to claim 4, further comprising: a third extension extending from the second extension and contacting the cap.

6. The cap-up is The inner body and an outer body arranged coaxially with the inner body; a plurality of bridges disposed between the inner body and the outer body and supporting the inner body relative to the outer body; The battery pack according to claim 5 , wherein the vent holes are disposed between adjacent ones of the bridges.

7. The battery pack according to claim 6 , wherein a distance between the first holder body and the second extension is greater than a distance between the first holder body and the inner body.

8. The battery pack according to claim 6, wherein the second extension portion has a length of 1 mm to 3 mm.

9. The battery pack according to claim 6 , wherein the width of the third extension is smaller than the diameter of the inner body.

10. The battery pack according to claim 9 , wherein an end of the third extension is disposed on the inner body.

11. The guide member is a chamber disposed between the first holder body and the connecting tab; The battery pack of claim 6, further comprising: a slit formed through the connection tab and connected to the chamber and the transmission hole.

12. The battery pack according to claim 11, wherein both sides of the chamber are open and connected to the transfer hole.

13. The battery pack according to claim 11, wherein the slit is arranged such that a longitudinal direction of the slit is aligned with a longitudinal direction of the connecting tab.

14. The battery pack according to claim 11, wherein the width of the slit is 0.8 mm to 1.2 mm.

15. The slit is a first slit extending through the first extension; a second slit connected to the first slit and passing through the second extension; The battery pack according to claim 11 , further comprising: a third slit connected to the second slit and penetrating the third extension portion.

16. The battery pack according to claim 15, wherein an end of the first slit is disposed to face the outer body.

17. a second holder spaced apart from the first holder and supporting the other side of the battery cell; The battery pack according to claim 1 , further comprising: a protective member disposed between the first holder and the second holder and surrounding the battery cell.

18. The protective member is a first protective member extending from the first holder toward the second holder; 18. The battery pack according to claim 17, further comprising: a second protective member extending from the second holder toward the first holder and in contact with the first protective member.

19. The battery pack according to claim 1 , further comprising a plurality of blocking members disposed to face the respective battery cells and covering the vent holes.

20. The battery pack of claim 19, wherein the blocking member is separated from the vent hole as waste is discharged through the vent hole.

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