Battery pack and device including the same

Abstract

A battery pack according to one embodiment of the present disclosure comprises: at least one battery module comprising a plurality of battery cell stacks; a pack frame accommodating the battery modules therein; an exhaust flow path through which a gas containing dust generated from the battery module moves; and a final filter that filters the dust before the gas containing the dust is discharged to the outside of the battery pack, in which the battery pack further includes a primary filter that is provided at a position where the direction of the exhaust flow path is changed and that primarily filters the dust before the final filter.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Korean Patent Application No. 10-2022-0084941 filed on Jul. 11, 2022 and Korean Patent Application No. 10-2023-0089362 filed on Jul. 10, 2023, the contents of each of the foregoing Korean Patent Applications are incorporated herein by reference in their entirety. Technical Field

[0003] The present disclosure relates to a battery pack and a device including the same, and more particularly, to a battery pack that can prevent an external fire phenomenon and blockage of an exhaust flow path and a device including the same. Background Art

[0004] In modern society, with the daily use of portable devices such as mobile phones, laptops, video cameras and digital cameras, the development of technology in the field related to mobile devices as described above has been initiated. In addition, rechargeable / dischargeable secondary batteries are used as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), etc., in an attempt to solve the problems of air pollution caused by existing gasoline vehicles using fossil fuels. Therefore, the demand for the development of secondary batteries is growing.

[0005] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-metal hydride batteries, nickel-zinc batteries, lithium secondary batteries, etc. Among them, lithium secondary batteries have attracted attention due to their advantages such as free charge and discharge, very low self-discharge rate, and high energy density.

[0006] On the other hand, in the case of secondary batteries for small devices, two to three battery cells are used, but in the case of secondary batteries for medium and large devices such as automobiles, medium or large battery modules electrically connecting a large number of battery cells are used.

[0007] Figure 1 are diagrams showing states before and after a fire phenomenon of a mesh formed in a conventional battery pack.

[0008] During the charge and discharge process, the battery cells installed on the battery module or battery pack can generate a large amount of heat, and if the temperature is higher than normal due to reasons such as overheating, the performance may deteriorate, and the excessive temperature rise may cause an explosion or fire. When the battery cell catches fire, the internal materials of the battery cell may be blown out to the outside of the battery module or battery pack together with the high-temperature combustible gas. Such internal materials are mainly materials such as C, Cu, Al, Ni, Co, Mg and Li, and are blown out in the form of high-temperature dust (i.e., sparks).

[0009] On the other hand, such sparks not only promote cascading thermal runaway phenomena within the battery module or battery pack, but also have the problem of contacting with combustible gas or external oxygen when discharged to the outside, causing external fire phenomena. Therefore, in recent years, attempts have been made to form a mesh on the frame of the battery module or battery pack to minimize the release of dust.

[0010] However, even if a mesh is formed on the frame, if Figure 1 The dust blocks the opening of the mesh, and the release of the internal gas is restricted, thereby rapidly increasing the internal pressure of the battery module or battery pack, which may cause explosion and frame damage. Therefore, an effective frame structure is required to restrict the release of sparks to the outside of the frame. Summary of the invention

[0011] Technical issues

[0012] An object of the present disclosure is to provide a battery pack having improved durability and safety by preventing an external ignition phenomenon caused by sparks and a device including the battery pack.

[0013] However, the technical problems to be solved by the embodiments of the present disclosure are not limited to the above-mentioned technical problems, and various extensions can be made within the scope of the technical concept included in the present disclosure.

[0014] Technical Solution

[0015] According to an embodiment of the present disclosure, a battery pack can be provided, comprising: at least one battery module, the at least one battery module comprising a plurality of battery cell stacks; a battery pack frame, the battery pack frame accommodating the battery modules; an exhaust flow path, through which gas containing dust generated from the battery modules moves; and a final filter, which filters dust before the dust-containing gas is discharged to the outside of the battery pack, wherein the battery pack also includes a primary filter, which is disposed at a location where the direction of the exhaust flow path is changed and which primarily filters dust before the final filter.

[0016] The primary filter may be arranged to be spaced apart from an inner surface of the exhaust flow path.

[0017] A first surface of the primary filter may face a first flow path through which gas flows into the primary filter, and a second surface of the primary filter may face a second flow path through which gas flows out of the primary filter.

[0018] The orientation of the first surface of the primary filter may be parallel to a first flow path through which gas flows into the primary filter, and the orientation of the second surface of the primary filter may be parallel to a second flow path through which gas flows out of the primary filter.

[0019] The primary filter includes at least one plate filter, wherein a flat surface of the plate filter may face a first flow path through which gas flows into the primary filter, and an edge portion of the plate filter may face a second flow path through which gas flows out of the primary filter.

[0020] The primary filter may include a plurality of plate filters arranged in parallel.

[0021] The first filter arranged closest to the first flow path may be in a loosest, non-tight state, and the plurality of plate filters may be formed of a plurality of filters that gradually become tight in the order in which they are arranged.

[0022] The primary filter may include "n" filters arranged in parallel, and a first filter closest to the first flow path may be the loosest, and a kth filter may be tighter than a k-1th filter, wherein k is a natural number from 1 to n.

[0023] The plurality of plate-shaped filters each include an opening portion, and the opening portions of the primary filters adjacent to each other may be arranged to be staggered with each other.

[0024] The primary filter may be formed of a mesh structure.

[0025] The primary filter may be formed of a corrugated mesh structure, and dust may be filtered at curved portions of the corrugations.

[0026] The primary filter may be a resin filter having a porous structure.

[0027] The exhaust flow path can be integrated into the interior of the battery pack frame.

[0028] The primary filter may be disposed at a corner portion of the pack frame.

[0029] The primary filter may have a recessed structure between both ends protruding toward a first flow path through which gas flows into the primary filter, and may have an open structure when viewed from a second flow path through which gas flows out of the primary filter.

[0030] When viewed from the second flow path, the primary filter has a U-shaped or V-shaped cross section.

[0031] The primary filter may be provided in plural in a direction perpendicular to each of the first flow path and the second flow path.

[0032] The battery pack may further include a first support member protruding toward the first flow path to support at least both ends of the primary filter.

[0033] The battery pack may further include a second supporting member connecting the first supporting members provided in at least both ends of the primary filter.

[0034] According to another embodiment of the present disclosure, a device including at least one battery pack as described above is provided.

[0035] Beneficial Effects

[0036] According to the embodiment, the battery pack of the present disclosure is provided with a primary filter, which can more effectively prevent dust from being released to the outside of the battery pack and can also prevent clogging of the exhaust flow path.

[0037] The effects of the present disclosure are not limited to the above-described effects, and additional other effects not described above will be clearly understood from the description of the claims by those skilled in the art. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 are diagrams showing states before and after a fire phenomenon of a mesh formed in a conventional battery pack.

[0039] Figure 2 is a perspective view of a battery pack according to an embodiment of the present disclosure.

[0040] Figure 3 is based on Figure 2 A perspective view of a battery module included in a battery pack.

[0041] Figure 4 is based on Figure 2 A top view of the battery pack.

[0042] Figure 5 An embodiment of the present disclosure is shown, and is an enlarged view showing the primary filter being set in Figure 4 A partial cross-sectional view of a portion of a battery pack shown in FIG.

[0043] Figure 6 Show Figure 5 Another embodiment of the present disclosure of a primary filter variation.

[0044] Figure 7 yes Figure 6A perspective view of one embodiment of a primary filter.

[0045] Figure 8 yes Figure 7 A partial enlarged view of the primary filter, showing the dust being filtered out at the bend.

[0046] Fig. 9 yes Figure 6 A perspective view of another embodiment of a primary filter.

[0047] Fig.10 is enlarged and shows the arrangement of Figure 6 A perspective view of a portion of a primary filter where the direction of the exhaust gas flow path is changed.

[0048] Fig.11 Another embodiment of a primary filter is shown.

[0049] Fig.12 yes Fig.11 an enlarged perspective view of the primary filter; and

[0050] Fig.13 Observed from different directions Fig.11 An enlarged perspective view of the primary filter. DETAILED DESCRIPTION

[0051] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the embodiments. The present disclosure can be modified in various different ways and is not limited to the embodiments set forth herein.

[0052] In order to clearly describe the present disclosure, parts not related to the description will be omitted, and the same reference numerals represent the same elements throughout the description. In addition, since the sizes and thicknesses of the various elements shown in the drawings are arbitrarily shown for the convenience of description, it is clear that the present disclosure is not necessarily limited to those elements shown in the drawings. In the drawings, the thickness is enlarged to clearly represent multiple layers and regions. In the drawings, the thickness of some layers and regions is enlarged for the convenience of description.

[0053] In addition, it will be understood that when an element such as a layer, film, region or plate is referred to as being formed or disposed "on" or "above" another element, it should be understood to include not only the case where the element such as a layer, film, region or plate is directly located on another element, but also the case where there are intermediate elements. Conversely, when an element such as a layer, film, region or plate is referred to as being "directly" formed or disposed "on" another element, this may mean that there are no other intermediate elements. In addition, the term "on" or "above" means disposed on or below a reference portion, and does not necessarily mean disposed at the upper end of the reference portion in the opposite direction of gravity. At the same time, similar to the case where it is described as being formed or disposed "on" or "above" another portion, the case where it is described as being formed or disposed "under" or "below" another portion will also be understood with reference to the above content.

[0054] Furthermore, since the upper / lower surface of a specific member may be determined differently depending on a direction used as a reference, throughout the description, “upper surface” or “lower surface” is defined to mean two mutually facing surfaces on the z-axis of the corresponding member.

[0055] Furthermore, throughout the description, when a part is referred to as “including” or “comprising” specific components, it means that the part may also include other components, and other components are not excluded unless otherwise specified.

[0056] Furthermore, throughout the description, when referred to as a “plane”, this means a case where the target portion is viewed from the upper side, and when referred to as a “cross section”, this means a case where the target portion is viewed from the side of a cross section cut vertically.

[0057] Now, a battery pack according to an embodiment of the present disclosure will be described.

[0058] Figure 2 is a perspective view of a battery pack according to an embodiment of the present disclosure. Figure 3 is based on Figure 2 A perspective view of a battery module included in a battery pack. Figure 4 is based on Figure 2 A top view of the battery pack. Figure 5 is based on Figure 2 A partial cross-sectional view of a battery pack. Figure 5 It can be a cross-section of a portion of the battery pack taken along the yz plane.

[0059] Reference Figures 2 to 5 , a battery pack 1000 according to an embodiment of the present disclosure may include: at least one battery module 100 ; a pack frame 200 accommodating the at least one battery module 100 ; and an exhaust flow path 300 formed between the battery module 100 and the pack frame 200 .

[0060] The battery module 100 according to an embodiment of the present disclosure may include: a battery cell stack constituted by stacking a plurality of battery cells; a module frame 120 accommodating the battery cell stack; a bus bar frame located on the front surface and / or rear surface of the battery cell stack; a bus bar and / or a sensing unit mounted on the bus bar frame, etc. However, the components included in the battery module 100 are not limited thereto, and according to the design, the battery module 100 may be provided in a state where a part of the above components is omitted, or the battery module 100 may be provided in a state where other components not proposed are added. The type of battery cells retained in the battery module 100 is not particularly limited, and a soft-pack type battery cell, a square battery cell, or a wound cylindrical battery cell may be applied.

[0061] The module frame 120 may include a metal having high thermal conductivity. Examples of the metal may be aluminum, gold, silver, copper, platinum, or alloys containing these metals. The higher the thermal conductivity of the metal, the higher the heat dissipation effect based on the module frame, so that the specific range of the thermal conductivity value is not set.

[0062] On the other hand, the opening portion 130 may be located on one surface of the module frame 120. When the battery module 100 catches fire, the opening portion 130 may be used to discharge gas, sparks, flames, etc. within the module frame 120. One surface of the module frame 120 where the opening portion 130 is formed may be a surface facing an electrode lead, a bus bar frame, or a bus bar of a battery cell stack.

[0063] The shape of the opening 130 may vary, and as an example, it may have an open shape. As another example, the opening 130 may be in the form of a plate that ruptures above a predetermined pressure, such as a rupture disk. As yet another example, it may be in the form of a valve that can open above a predetermined pressure, such as a safety valve.

[0064] like Figure 2 and Figure 4 As shown, a plurality of battery modules 100 may be provided in a battery pack 1000. The plurality of battery modules 100 may be arranged in rows and columns within a battery pack frame 200. Figure 2 and Figure 4 The plurality of battery modules 100 are shown in the lateral direction ( Figure 4 In the case where the plurality of battery modules 100 are stacked in two rows, the present disclosure is not limited to those arrangements described above and may be stacked in various arrangements.

[0065] The battery pack frame 200 according to the present embodiment can be used to protect the battery module 100 and the electrical components connected thereto from external impacts. The battery pack frame 200 may include a lower frame including a lower surface (bottom surface) and a side surface. The battery module 100 is arranged in the inner space of the lower frame formed by the lower surface and the side surface, and then the upper plate or upper frame is combined with the edge of the lower frame, so that the battery pack frame 200 can be sealed. Here, the upper plate or upper frame may be interpreted as being included in the battery pack frame 200, but this is not necessarily the case.

[0066] The battery pack frame 200 may include a portion having high thermal conductivity to quickly dissipate the heat generated in the internal space to the outside. For example, at least a portion of the battery pack frame 200 may be made of a metal having high thermal conductivity, and examples thereof may be aluminum, gold, silver, copper, platinum, alloys containing these metals, and the like. In addition, the battery pack frame 200 may partially have electrical insulation, and an insulating film may be provided at a location where insulation is required, or an insulating coating may be applied. The portion of the battery pack frame 200 to which the insulating film or insulating coating is applied may be referred to as an insulating portion.

[0067] The exhaust flow path 300 may be used to discharge the gas generated from the battery module 100 to the outside of the battery pack 1000. The exhaust flow path 300 may be integrated into the interior of the battery pack frame 200. In this case, the exhaust flow path 300 may be formed in a separation space between the battery module 100 and the battery pack frame 200. However, the present disclosure is not limited to the above structure, and may be applied even when the exhaust flow path 300 is separately provided outside the battery pack frame 200, for example, the exhaust flow path 300 has a structure and shape that allows the high-temperature gas, etc., discharged from the battery module 100 to be discharged to the outside to meet the requirements.

[0068] Flames, gases, etc. discharged from each battery module 100 to the exhaust flow path 300 can move along the exhaust flow path 300 and be discharged to the outside through the outlet port 210 provided at the position where the exhaust flow path 300 ends. The shape of the outlet port 210 can vary. As an example, it can be in the form of an opening provided in the battery pack frame 200. As another example, the outlet port 210 can be in the form of a valve capable of opening above a predetermined pressure, for example, a safety valve. Preferably, the exhaust flow path 300 can be formed to correspond to all battery modules 100 in the battery pack 1000. For example, as Figure 4 As shown, when the battery modules 100 are arranged in two rows and four columns, the exhaust flow path 300 may be formed between the battery modules 100 arranged in each row and the battery pack frame 200. Flames, gases, etc. exhausted from the battery modules 100 may move along the dotted arrows through the exhaust flow path 300 and be exhausted to the outlet port.

[0069] The opening portion 130 may be located on one surface of the battery module 100 that contacts the exhaust flow path 300. The opening portion 130 of the battery module 100 may be arranged toward the exhaust flow path 300. The battery module 100 may be arranged so that one surface on which the opening portion 130 is formed faces the exhaust flow path 300. Figure 4 As shown, when the exhaust flow path 300 is formed along the edge of the battery pack frame 200, the battery module 100 may be arranged so that the opening portion 130 is disposed toward the battery pack frame 200. The exhaust flow path 300 may be formed to extend along one surface of the battery pack frame 200 corresponding to the opening portion 130. Gas, flame, etc. exhausted through the opening portion 130 may be exhausted into the hollow space and then move to the exhaust flow path 300 located at the upper side of the hollow space.

[0070] On the other hand, refer to Figure 6 , the exhaust flow path 300 is provided with a final filter 400. As an example, the final filter 400 may be provided at a position where the exhaust flow path terminates, that is, at the front end of the outlet port 210. The high-temperature gas, dust, etc. discharged from the battery module 100 pass through the final filter 400 before passing through the exhaust flow path 300, and are then discharged to the outside via the outlet port 210 provided in the battery pack frame 200. The final filter 400 may be a filter having a mesh structure, or may also be a resin filter, as described in detail below.

[0071] The gas exhausted from the battery module 100 passes through the final filter 400 and is exhausted to the outside of the battery pack frame 200, and the high-temperature dust (i.e., sparks) may be filtered by the final filter 400 and not exhausted to the outside. If the release of the high-temperature dust (i.e., sparks) is limited by the final filter 400, the possibility of the sparks contacting with external oxygen is reduced, thereby preventing additional fires from occurring in components adjacent to the battery pack frame 200.

[0072] In addition, a primary filter 500 is further provided between a portion of the exhaust flow path 300, that is, the opening portion 130 of the module frame 120 corresponding to the starting point of the exhaust flow path 300 and the final filter 400. That is, the gas and dust discharged from the battery module 100 may first pass through the primary filter 500 before passing through the final filter 400. Therefore, since the high-temperature dust discharged from the battery module 100 is primarily filtered in the primary filter 500 and is finally filtered again by the final filter 400, the risk of high-temperature dust being discharged to the outside of the battery pack frame 200 can be more effectively prevented. In addition, clogging of the final filter 400 due to dust can also be prevented.

[0073] According to the present disclosure, the primary filter 500 is located at a portion where the direction of the exhaust flow path 300 is changed. The exhaust flow path 300 includes a first flow path portion 300a and a second flow path portion 300b. The first flow path portion 300a refers to a flow path through which gas and dust exhausted from the battery module 100 flow into the primary filter 500, and the second flow path portion 300b refers to a flow path through which gas and dust primarily filtered by the primary filter 500 flow out of the primary filter 500.

[0074] Figure 5 The first flow path portion 300a is shown to be arranged in the lateral direction ( Figure 4 ), and the second flow path portion 300b is arranged in the longitudinal direction ( Figure 4 In the y-axis direction). Figure 5 In this embodiment, Figure 4 In the four corners of the battery pack frame 200, they can be arranged at the upper corner and the lower corner on the side where the outlet port 210 is located (see Figure 4 dotted circle in the figure).

[0075] On the other hand, according to the stacking direction of the battery module 100, the structure and shape of the exhaust flow path 300, the position change of the outlet port 210, etc., the position of the flow path change of the exhaust flow path 300 can be changed or modified. Therefore, the arrangement of the primary filter 500 at the position where the flow path of the exhaust flow path 300 is changed is sufficient to meet the requirements, and the present disclosure is not limited to the above structure.

[0076] In addition, according to the present disclosure, in order to prevent the blockage of the exhaust flow path 300, when viewed from a cross section perpendicular to the moving direction of the gas and dust in the exhaust flow path 300, the primary filter 500 is arranged only in a part of the cross section. That is, even if the primary filter 500 is positioned, the exhaust flow path 300 has an open structure in the cross-sectional view. In other words, the primary filter 500 is arranged to be spaced apart from the inner surface of the exhaust flow path 300. To this end, the primary filter 500 can be arranged separately by a support member (not shown) mounted on the inner surface of the exhaust flow path 300. The support member can be a frame or a rod shape. For example, more than one straight rod can be provided, or it can be set to a U shape. For example, the support member is manufactured by folding or bending a single straight rod or a frame, by joining a plurality of straight rods or frames, or by die casting (die casting) molding, etc. The support member supports the primary filter 500 to be spaced apart from the inner surface of the exhaust flow path 300, and it does not block the exhaust flow path 300, which is sufficient to meet the requirements, and the shape or structure of the support member is not limited.

[0077] Even if the primary filter 500 is clogged by accumulated dust in the primary filter 500, the cross-section of the exhaust flow path 300 where the primary filter 500 is located still has an open structure, that is, the exhaust flow path 300 is not clogged, thereby preventing the risk of explosion of the battery pack frame 200, for example.

[0078] In addition, according to the present disclosure, the outer surface of the primary filter 500 includes a first surface 500a facing the first flow path portion 300a and a second surface 500b facing the second flow path portion 300b. At this time, the orientation of the first surface 500a of the primary filter 500 can be parallel to the direction in which the gas and dust discharged from the battery module 100 flow into the primary filter 500. On the other hand, the outer surface of the primary filter 500 faces the second flow path portion 300b. That is, the orientation of the other surface of the primary filter 500 can be parallel to the direction in which the gas and dust discharged from the battery module 100 flow into the primary filter 500.

[0079] Figure 6 A primary filter 500' according to another embodiment of the present disclosure is shown. Figure 6 and Figure 7 In the embodiment of the present invention, the primary filter 500' may be provided with at least one plate filter 500-1, 500-2, 500-k, ..., 500-n (where k is a natural number from 1 to n). That is, the primary filter 500' may be composed of a single plate filter 500-1, or may be composed of a plurality of plate filters 500-1, 500-2, 500-k, ..., 500-n. The plurality of plate filters 500-1, 500-2, 500-k, ..., 500-n may be arranged in parallel with each other.

[0080] Plate filter 500-k also has Figure 5 For the definition of the first surface 500a and the second surface 500b, refer to Figure 5The above contents. At this time, the wide flat portion of the plate filter 500-k is the first surface 500a, and the edge portion of the plate filter 500-k is the second surface 500b. Since the wide flat portion of the plate filter 500-k faces the first flow path portion 300a, the dust discharged from the battery module 100 is filtered. On the other hand, when the primary filter 500' is observed from the second flow path portion 300b, the edge portion of the plate filter 500-k is observed, and therefore, the primary filter 500' has an opening structure. Therefore, even if the filtering function is lost as the primary filter 500' performs a certain degree of filtration, due to this opening structure, the exhaust flow path 300 will not be blocked, and the gas and dust discharged from the battery module 100 can flow to the outlet port 210. On the other hand, the plurality of plate filters 500-1, 500-2, 500-k, ..., 500-n are arranged in order from the filter closest to the first flow path portion 300a, that is, the first filter 500-1 to the nth filter 500-n, the first filter 500-1 may be the loosest non-tight filter, and the last nth filter 500-n may be the densest filter. The gas and dust exhausted from the battery module 100 first pass through the first filter 500-1 to form the loosest non-tight state, and the subsequent filters 500-2, 500-k, ..., 500-n become tight in order, so that the risk of filtered dust blocking the exhaust flow path 300 can be prevented.

[0081] In summary, the gas and dust flowing in from the battery module 100 move along the first flow path portion 300a and pass through the primary filter 500 located at the point where the first flow path portion 300a terminates. At this time, due to the linear properties (inertia) of gas and dust, the dust is filtered by the primary filter 500' while passing through the first filter 500-1 in the loosest non-tight state, and passing through the subsequent filters 500-2, 500-k, ..., 500-n that gradually become tight in sequence. On the other hand, since the primary filter 500' is located at the point where the flow path changes, the gas moves to the changed flow path, that is, the second flow path portion 300b. At this time, since the primary filter 500' has an open structure when viewed from the second flow path portion 300b, the gas moves smoothly along the second flow path portion 300b, and the dust is finally filtered by the final filter 400 at the front end of the outlet port 210, and then discharged to the outside via the outlet port 210 provided in the battery pack frame 200.

[0082] The primary filter 500 may be a filter having a mesh structure. Figure 7 As shown, the mesh structure may be a wavy mesh structure arranged in multiple rows. Alternatively, mesh structures of various shapes may be used, for example, a structure woven into a square mesh. In the case of a wavy mesh structure, at the bend 510 (see Figure 8 ) to filter dust, and the portion other than the bent portion is open, so that the gas can move smoothly to the second flow path portion 300b without the filter being clogged by dust.

[0083] The filter having a mesh structure may be made of a metal material. Alternatively, a raw fabric obtained by weaving multifilament fibers such as polyester, nylon, polypropylene, etc. may be coated with a flame retardant vinyl chloride-based paste resin composition and then processed into a mesh shape by heat treatment.

[0084] In addition, the primary filter 500 may have a structure including a plurality of adsorption holes therein. In this case, the primary filter 500 may be a resin filter having a porous structure capable of filtering out foreign matter of fine size. The resin used to manufacture the resin filter includes materials having excellent heat resistance, for example, fluororesins, polyurethane resins, and epoxy resins.

[0085] On the other hand, Fig. 9 As shown, the primary filter 500' may include an opening 520. When the primary filter is viewed from the first flow path portion 300a, the positions of the openings 520-k (where k is a natural number from 1 to n) of the plurality of primary filters 500-k may be arranged such that adjacent primary filters are staggered with each other. Fig. 9 (a) is a perspective view, and Fig. 9 (b) shows a state where a plurality of primary filters are arranged in a row for convenience of explanation.

[0086] In addition, the primary filter 500' is a modification of the primary filter 500, and may adopt a filter having a mesh structure as described above for the primary filter 500, or may have a structure made of a flame retardant material, which will be described later. That is, as described above, the primary filter 500' has a structure in which an opening portion 520 is further added to the primary filter 500.

[0087] On the other hand, the primary filter 500 may be made of a flame retardant material that is almost inflammable, such as chlorine-containing vinyl chloride resin, chlorinated paraffin, decabromodiphenyl ether, antimony trioxide, and the like.

[0088] Fig.10 is enlarged and shows the arrangement of Figure 6 A perspective view of a portion of the primary filter where the direction of the exhaust gas flow path is changed. Figure 6 and Fig.10 As shown, the primary filter 500' is arranged to be spaced apart from the inner wall of the exhaust flow path 300 so as not to block the exhaust flow path 300, and is particularly arranged to have an open structure with respect to the second flow path portion 300b through which the exhaust gas escapes.

[0089] Figures 11 to 13 Another embodiment of a primary filter is shown. Fig.11 The case where the primary filter 500 is located at a portion where the direction of the exhaust flow path 300 changes is exemplified. Fig.12 yes Fig.11 An enlarged perspective view of the primary filter 500 is shown. Fig.13 Observed from different directions Fig.11 An enlarged perspective view of the primary filter 500. Fig.12 and Fig.13 In the figure, for easy understanding, illustration of the frame 200 forming the first flow path portion 300a and the second flow path portion 300b is omitted.

[0090] Reference Fig.11 , the primary filter 500 is arranged between the first flow path portion 300a and the second flow path portion 300b where the direction of the flow path is changed. The primary filter 500 is installed on the support unit 530. The support unit 530 includes a first support member 531 that supports at least two ends of the primary filter 500. Here, the two ends of the primary filter 500 refer to two ends in directions perpendicular to the extension direction of the first flow path portion 300a and the extension direction of the second flow path portion 300b, respectively. Fig.11 In the illustration, it indicates the end portion in the height direction of the flow path 300.

[0091] The first support member 531 protrudes toward the first flow path portion 300a into which the exhaust gas flows. The second support member 532 is connected between the first support members 531 respectively arranged at the two ends of the primary filter 500. For example, the second support member 532 may extend in the height direction of the flow path 300, and the second support member 532 supports the primary filter 500, for example, in the height direction. The first support member 531 may extend vertically from the second support member 532. In addition, the first support member 531 protrudes from the two ends (upper end and lower end) of the second support member 532, respectively, and supports the two ends (upper end and lower end) of the primary filter 500. On the other hand, the present disclosure is not limited to the structure shown, and various modifications and changes may be made, for example, a structure having a first support member 531 protruding from the inner wall of the flow path 300 without a second support member 532.

[0092] The primary filter 500 can be manufactured in a sheet shape, for example, and can be manufactured to be longer than the height between the first support members 531 supporting the two ends (upper and lower ends) of the primary filter 500. The primary filter 500 can have a structure and shape that is recessed toward the first flow path portion 300a. More specifically, both ends of the primary filter 500 protrude toward the first flow path portion 300a, and a recessed structure can be formed between the two ends. At this time, when observed from the second flow path portion 300b through which the exhaust gas flows out, it has an open shape. For example, the cross section observed from the second flow path portion 300b can have a U-shape or a V-shape. Therefore, when observed from the first flow path portion 300a into which the exhaust gas flows, the primary filter 500 is formed to span the first flow path portion 300a, and when observed from the second flow path portion 300b, the primary filter 500 becomes an open structure that is not blocked.

[0093] Therefore, the exhaust gas containing dust and the like abuts against the entire area of ​​the primary filter 500 from the first flow path portion 300a, the dust and the like are filtered, and the exhaust gas moves to the second flow path portion 300b which is the direction of the opening of the primary filter 500. At this time, even if the primary filter 500 is clogged due to continuous filtration in the primary filter 500 (even if the filtering function is almost lost), due to the structure of the primary filter 500, the second flow path portion 300b has an opening, so that the situation where the primary filter 500 clogged with dust blocks the flow path 300 can be avoided.

[0094] Fig.11 The case where the primary filter 500 has a U-shaped cross section is exemplarily shown. In some cases, a portion of the primary filter 500 other than the upper end and the lower end may be engaged with the second supporting member 532 .

[0095] also, Fig.11 The case where a plurality of primary filters 500 each having a U-shaped cross section are arranged in the up-down direction is shown. That is, the plurality of primary filters 500-1 and 500-2 may be arranged in a direction perpendicular to each of the extension direction of the first flow path portion 300a and the extension direction of the second flow path portion 300b. At this time, both ends of each of the plurality of primary filters 500-1 and 500-2 may be connected to each other.

[0096] For example, not only the upper and lower ends of the primary filter 500 can be supported by the first support member 531, but also the center portion can be supported by the first support member 531. Therefore, a plurality of U-shaped primary filters 500 are arranged in the extension direction (e.g., the up and down direction) of the second support member 532, and the primary filter 500 is exemplarily shown as a "3" shape as a whole. On the other hand, the present disclosure is not limited to the structure shown, and various modifications and changes may be made, for example, more than three primary filters 500 having a U-shaped or V-shaped concave shape are provided. On the other hand, although not specifically mentioned above, the battery pack according to an embodiment of the present disclosure may further include a battery management system (BMS) and / or a cooling device that controls and manages the temperature, voltage, etc. of the battery.

[0097] The battery pack according to one embodiment of the present disclosure can be applied to various devices. For example, the device to which the battery pack is applied can be a vehicle device such as an electric bicycle, an electric vehicle, or a hybrid vehicle, but the above-mentioned device is not limited thereto, and the battery pack according to this embodiment can be used for various devices other than the above description, which also falls within the scope of the present disclosure.

[0098] Although the present disclosure has been shown and described in detail with reference to its preferred embodiments, the scope of the present disclosure is not limited thereto, and those skilled in the art may make various modifications and improvements using the basic concepts of the present disclosure defined in the appended claims, which also fall within the scope of the present disclosure.

[0099] [Explanation of Reference Numerals]

[0100] 1000: Battery Pack

[0101] 100: Battery module

[0102] 130: Opening

[0103] 200: Battery Pack Frame

[0104] 210: egress port

[0105] 300: Exhaust flow path

[0106] 300a: First flow path part

[0107] 300b: Second flow path portion

[0108] 400: Final filter

[0109] 500, 500': Primary filter

[0110] 500-1, 500-2, ..., 500-k, ..., 500-n: Primary filter

[0111] 500a: First surface

[0112] 500b: Second surface

[0113] 510: Bend

[0114] 520: Opening

[0115] 530: Support unit

[0116] 531: First supporting member

[0117] 532: Second supporting member

Claims

1. A battery pack comprising: at least one battery module, the at least one battery module comprising a plurality of battery cell stacks; a battery pack frame, the battery pack frame accommodating the battery module; an exhaust flow path through which gas containing dust generated from the battery module moves; and a final filter that filters the dust before the gas containing the dust is discharged to the outside of the battery pack, The battery pack further includes a primary filter, which is provided at a position where the direction of the exhaust flow path changes, and the primary filter primarily filters the dust before the final filter.

2. The battery pack according to claim 1, wherein: The primary filter is arranged to be spaced apart from an inner surface of the exhaust flow path.

3. The battery pack according to claim 1, wherein: A first surface of the primary filter faces a first flow path through which the gas flows into the primary filter, and a second surface of the primary filter faces a second flow path through which the gas flows out of the primary filter.

4. The battery pack according to claim 3, wherein: The first surface of the primary filter is oriented parallel to the direction of the first flow path through which the gas flows into the primary filter, and The second surface of the primary filter is oriented parallel to a direction of the second flow path through which the gas flows out of the primary filter.

5. The battery pack according to claim 1, wherein: The primary filter comprises at least one plate filter, The flat surface of the plate filter faces the first flow path through which the gas flows into the primary filter, and An edge portion of the plate filter faces a second flow path through which the gas flows out of the primary filter.

6. The battery pack according to claim 5, wherein: The primary filter includes a plurality of plate-shaped filters arranged in parallel.

7. The battery pack according to claim 6, wherein: The first filter disposed closest to the first flow path is in a loosest, non-tight state, and the plurality of plate-shaped filters are formed of a plurality of filters that gradually become tighter in the order in which they are disposed.

8. The battery pack according to claim 6, wherein: The primary filter comprises n filters arranged in parallel, and The first filter closest to the first flow path is the loosest, and the kth filter is tighter than the k-1th filter, where k is a natural number from 1 to n.

9. The battery pack according to claim 6, wherein: Each of the plurality of plate-shaped filters includes an opening, and The openings of the primary filters adjacent to each other are arranged to be staggered.

10. The battery pack according to claim 1, wherein: The primary filter is formed of a mesh structure.

11. The battery pack according to claim 10, wherein: The primary filter is formed of a wave-shaped mesh structure, and the dust is filtered at curved portions of the wave shape.

12. The battery pack according to claim 1, wherein: The primary filter is a resin filter with a porous structure.

13. The battery pack according to claim 1, wherein: The exhaust flow path is integrated into the interior of the battery pack frame.

14. The battery pack according to claim 13, wherein: The primary filter is provided at a corner portion of the pack frame.

15. The battery pack according to claim 1, wherein: The primary filter has a recessed structure between both ends, wherein the both ends protrude toward a first flow path through which the gas flows into the primary filter, and The primary filter has an open structure when viewed from a second flow path through which the gas flows out of the primary filter.

16. The battery pack according to claim 15, wherein: When viewed from the second flow path, the primary filter has a U-shaped or V-shaped cross section.

17. The battery pack according to claim 15, wherein: The primary filter is provided in plurality along a direction perpendicular to each of the first flow path and the second flow path.

18. The battery pack according to claim 15, further comprising: A first supporting member protrudes toward the first flow path to support at least both ends of the primary filter.

19. The battery pack according to claim 18, further comprising: A second supporting member connects the first supporting members respectively provided in at least both ends of the primary filter.

20. A device comprising at least one battery pack according to claim 1.

Images