Battery pack and energy storage system

Abstract

A battery pack according to an embodiment of the present invention comprises: a cell module assembly including a plurality of battery cells; and a pack case for accommodating the cell module assembly therein, wherein the pack case includes a drain hole, and a filter unit is mounted in the drain hole.

Description

Battery packs and energy storage devices

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

[0002] This application claims the benefit of priority to Korean Patent Application No. 10-2023-0101239, filed August 2, 2023, and Korean Patent Application No. 10-2024-0095854, filed July 19, 2024, the entire contents of which are incorporated herein by reference.

[0003] The present invention relates to a battery pack and an energy storage device, and more particularly, to a battery pack and an energy storage device having drainage, waterproof, and dustproof performance.

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

[0005] Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among these, lithium secondary batteries are receiving the most attention due to their advantages of free charging and discharging, low self-discharge rate, and high energy density.

[0006] These secondary batteries are widely used not only in small devices like portable electronic devices, but also in medium- to large-scale devices like electric vehicles and energy storage systems (ESS), and their use is rapidly increasing. Furthermore, the use of residential battery packs for power storage has been on the rise recently.

[0007] Figure 1 illustrates an exploded perspective view of a battery pack according to the prior art.

[0008] The battery pack according to Fig. 1 includes a case in which a plurality of cell module assemblies (20) are stacked inside a case in which an upper plate (11) and a lower plate (12) are combined, and additionally includes insulating plates (13, 14) between the cell module assemblies (20) and the upper plate (11) and the lower plate (12), respectively. An insulating plate (14) is placed on the lower plate (12), and a plurality of cell module assemblies (20) are stacked thereon. An insulating plate (13) is placed thereon, and a plurality of cell module assemblies (20) are covered thereon with an upper plate (11).

[0009] Meanwhile, when a battery pack is implemented as an energy storage device (ESS) and placed outdoors in a house, it is important to prevent moisture or dust from entering the case of the battery pack or moisture from being generated due to condensation, etc., from affecting the performance of the battery cell.

[0010] The purpose of the present invention is to provide a battery pack and energy storage device having waterproof and dustproof performance.

[0011] However, the problems to be solved by the embodiments of the present invention are not limited to the problems described above and can be expanded in various ways within the scope of the technical ideas included in the present invention.

[0012] A battery pack according to one embodiment of the present invention comprises: a cell module assembly including a plurality of battery cells; and a pack case storing the cell module assembly therein, wherein the pack case includes a drain port, and a filter unit can be mounted in the drain port.

[0013] The above filter unit includes a filter body and a filter cover covering the filter body, the drain port includes a plurality of slit-shaped openings, and the filter cover can include a plurality of slit-shaped openings.

[0014] The longitudinal direction of the slit of the above drain and the longitudinal direction of the slit of the above filter cover may intersect each other.

[0015] The filter body may be mounted on the plurality of slits of the drain port so as to be interposed between the drain port and the filter cover.

[0016] The above filter body filters external moisture, water, and dust entering through the drain, but can discharge moisture inside the battery pack to the outside.

[0017] The above filter body and the above filter cover may be detachable from the drain port.

[0018] The above filter cover can be hook-connected to the drain port.

[0019] The above pack case may include a case body and a lower plate disposed at the lower portion of the case body.

[0020] The upper surface of the lower plate has a slope that gradually decreases in height toward the drain, and the height of the upper surface of the filter cover mounted on the drain may be equal to or lower than the height of the upper surface of the lower plate.

[0021] The case body includes an open end at the bottom, and the lower plate can be coupled to the open end to cover the open end.

[0022] It may further include a sealing member provided on the joining surface of the case body and the lower plate.

[0023] The pack case includes a connector electrically connected between an external wire and a power unit provided inside the battery pack, and the connector can be coupled to the pack case such that one end of the connector facing the outside of the pack case faces downward rather than in a horizontal direction.

[0024] The above connector may be coupled to the pack case so as to slope downward from the inside to the outside of the pack case.

[0025] The pack case includes a connector receiving portion that is concavely formed inward from an outer surface of the pack case, and the connector can be coupled to the connector receiving portion.

[0026] The above connector may be a waterproof connector.

[0027] An energy storage device including a battery pack according to the embodiments described above can be provided.

[0028] According to the present invention, moisture generated within a battery pack or energy storage device can be easily discharged, and waterproof, dustproof, or flame-retardant performance can be maximized. Accordingly, the quality of the battery pack or energy storage device can be improved.

[0029] The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

[0030] Figure 1 illustrates an exploded perspective view of a battery pack according to the prior art.

[0031] Figure 2 is a perspective view of a battery pack according to one embodiment of the present invention.

[0032] Figure 3 is an exploded perspective view of the battery pack of Figure 2.

[0033] FIG. 4 illustrates a case where at least one cell module assembly is housed in the battery pack of FIG. 2.

[0034] Figure 5 is an enlarged view of the lower plate of Figure 2.

[0035] Figure 6 is an exploded perspective view of the lower plate of Figure 5.

[0036] Figure 7 is a top view of the lower plate of Figure 5.

[0037] Figure 8 shows a cross-sectional view of the inclined surface of the lower plate of Figure 5.

[0038] Figure 9 is an enlarged view of the drain and filter unit of the lower plate of Figure 5.

[0039] Figure 10 is an exploded perspective view of Figure 9.

[0040] Figure 11 shows an example of a filter unit being coupled to a drain hole of a lower plate.

[0041] Figure 12 illustrates a cross-sectional view of a connector that can be provided in the pack case of the battery pack of Figure 2.

[0042] Figure 13 is a perspective view of a battery pack according to another embodiment of the present invention.

[0043] Figure 14 is an exploded perspective view of the pack case of Figure 13.

[0044] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0045] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0046] Furthermore, the sizes and thicknesses of each component shown in the drawings are arbitrarily indicated for convenience of explanation, and thus the present invention is not necessarily limited to the illustrated components. In the drawings, the thicknesses are enlarged to clearly represent various layers and regions. Furthermore, in the drawings, the thicknesses of some layers and regions are exaggerated for convenience of explanation.

[0047] Furthermore, when we say that a layer, membrane, region, plate, or other part is "on" or "over" another part, this includes not only cases where it is "directly on" the other part, but also cases where there are other parts in between. Conversely, when we say that a part is "directly on" another part, it means that there are no other parts in between. Furthermore, saying that a part is "on" or "over" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "above" or "over" the direction opposite to gravity.

[0048] Additionally, throughout the specification, whenever a part is said to "include" a component, this does not mean that it excludes other components, but rather that it may include other components, unless otherwise specifically stated.

[0049] Additionally, throughout the specification, when we say "in plan", we mean when the target portion is viewed from above, and when we say "in cross section", we mean when the target portion is viewed from the side in a cross-section cut vertically.

[0050] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0051] Fig. 2 is a perspective view of a battery pack according to one embodiment of the present invention. Fig. 3 is an exploded perspective view of the battery pack of Fig. 2. Fig. 4 illustrates a case where at least one cell module assembly is housed in the battery pack of Fig. 2.

[0052] A battery pack (100) according to one embodiment of the present invention largely includes a pack case (10) and at least one cell module assembly (20, see FIG. 4) housed within the pack case (10). The cell module assembly (20) includes a plurality of stacked battery cells. It may include a case body (110), an upper plate (120), and a lower plate (130). The case body (110) may be formed of a storage portion (110a) in which the cell module assembly (20) is housed, and a rear plate (110b) covering the rear surface of the storage portion (110a). Meanwhile, the present invention is not limited to that shown in the exploded perspective view of FIG. 3, and various modifications and changes are possible, such as the upper plate (120) or the lower plate (130) being formed integrally with the case body (110).

[0053] At least one cell module assembly (20) is placed inside the case body (110), and then an upper plate (120) and a lower plate (130) can be coupled to each of the open ends (112) (open ends, for example, upper and lower ends) of the case body (110). The open ends (112) of the case body (110) include a rim portion (111) to support the upper plate (120) and the lower plate (130) and to enable the upper plate (120) and the lower plate (130) to be coupled thereto. The rim portion (111) protrudes from the case body (110) toward the opening of the open ends (112) (for example, perpendicularly) at each of the open ends (112) of the case body (110). The rim portion (111) can be formed entirely or partially along the periphery of each of the open ends (112) of the case body (110). The upper plate (120) and the lower plate (130) are connected to each of the frame portions (111) and are fastened. The structure and shape of the frame portion (111) are sufficient as long as they support the upper plate (120) and the lower plate (130) and allow the upper plate (120) and the lower plate (130) to be joined, and there are no special limitations.

[0054] In addition, the cell module assembly (20) includes a plurality of stacked battery cells, and the battery cells may be pouch-shaped battery cells, but the present invention is not limited to what is illustrated, and can be applied with various modifications and changes even when square battery cells or cylindrical battery cells are stacked. In addition, the cell module assembly (20) may be provided in a plurality of units as illustrated in FIG. 4 and mounted on the case body (110), but the present invention is not limited to what is illustrated, and can be applied even when one cell module assembly (20) is mounted inside the case body (110) to constitute a battery pack (100), and various modifications and changes are possible.

[0055]

[0056] Fig. 5 is an enlarged view of the lower plate of Fig. 2. Fig. 6 is an exploded perspective view of the lower plate of Fig. 5. Fig. 7 is a top view of the lower plate of Fig. 5. Fig. 8 is a cross-sectional view of the inclined surface of the lower plate of Fig. 5.

[0057] First, referring to FIG. 5, the lower plate (130) includes a lower plate body (140), a sealing member (150), and a filter unit (160).

[0058] A sealing member (150) may be additionally provided on the joint surface between the case body (110) and the lower plate (130) to prevent water or dust from entering the inside of the battery pack (100). The sealing member (150) may be mounted along the edge (border) of the lower plate (130) within the lower plate (130).

[0059] The sealing member (150) is not limited in type as long as it can resolve the joint tolerance when joining the case body (110) and the lower plate (130) and has waterproof properties. Additionally, it may have fire resistance and insulation properties. In this case, even if a flame or spark occurs in a battery cell inside the battery pack (100), the flame or spark can be prevented from being released to the outside of the battery pack (100) through the gap between the case body (110) and the lower plate (130). For example, the sealing member (150) may be made of rubber or silicone. The sealing member (150) may additionally include a hole in a portion corresponding to the joining portion (143) of the lower plate (130). The sealing member (150) may also be applied to the joining between the case body (110) and the upper plate (120).

[0060] Meanwhile, a filter unit (160) can be mounted on the drain hole (142) of the lower plate body (140) of the pack case (10), which will be described in detail later with reference to FIGS. 9 to 11.

[0061]

[0062] Referring to FIG. 6, the lower plate body (140) of the pack case (10) includes a bottom surface (141), a drain hole (142), a joint (143), and a guide member (144). Moisture present inside the battery pack (100) falls to the bottom surface (141) of the lower plate body (140). In order to discharge moisture or water that has condensed inside the battery pack (100) or has unintentionally entered the battery pack (100) to the outside of the battery pack (100), a drain hole (142) is included in the lower plate body (140).

[0063] The drain port (142) includes an opening formed by a plurality of slits (142a). A filter unit (160) can be mounted on the plurality of slits (142a) of the drain port (142). The height of the upper surface of the drain port (142) is lower than the height of the bottom surface (141) of the lower plate body (140). The height of the upper surface of the filter unit (160) mounted on the drain port (142) is equal to or lower than the height of the bottom surface (141) of the lower plate body (140). Accordingly, even if the filter unit (160) is mounted on the upper surface of the drain port (142), water can be smoothly discharged to the outside.

[0064] As illustrated in FIG. 7, water inside the battery pack (100) flows along the arrow direction of the bottom surface (141) and is discharged to the outside of the battery pack (100) through the drain port (142). At this time, as illustrated in FIG. 8, the bottom surface (141) has a slope so that the water can flow well toward the drain port (142). At this time, the bottom surface (141) becomes lower in height as it goes toward the drain port (142). The drain port (142) may be arranged at the center of the lower plate body (140), but the present invention is not limited thereto, and it is sufficient if it is provided in the lower plate body (140). When the drain port (142) is provided at or near the center of the lower plate body (140), the upper surface of the bottom surface (141) becomes lower in height as it goes from the edge toward the drain port (142).

[0065]

[0066] Referring again to FIG. 6, the lower plate (130) is formed with a plurality of connecting portions (143). The connecting portions (143) of the lower plate (130) may be provided in the form of through holes or concave portions. The connecting portions (143) of the lower plate (130) may be formed, for example, along the perimeter of the lower plate (130). A plurality of connecting portions (113, see FIG. 3) are also formed on the edge portion (111) of the case body (110). The connecting portions (113) of the case body (110) may be provided in the form of through holes or concave portions. The connecting portions (113) of the case body (110) may be formed along the edge portion (111) at predetermined intervals.

[0067] The connecting portion (143) of the lower plate (130) and the connecting portion (113) provided in multiple numbers on the edge portion (111) of the case body (110) are provided at positions corresponding to each other in a one-to-one manner. The connecting portion (143) of the lower plate (130) and the connecting portion (113) of the case body (110) are arranged to be aligned with each other. Accordingly, when the case body (110) and the lower plate (130) are connected, the connecting portion (113) of the case body (110) and the connecting portion (143) of the lower plate (130) are arranged at the same position and can be connected by a connecting member (not shown). The connecting member may be a bolt-nut, and in some cases, a female screw thread may be provided on the connecting portion (113) of the case body (110) and the connecting portion (143) of the lower plate (130) so that a male screw bolt may be connected, and the connecting member may be connected in various ways. In addition, the number, arrangement, and spacing of the connecting portion (113) of the case body (110) and the connecting portion (143) of the lower plate (130) are not limited to those shown in FIGS. 6 and 7, and are sufficient as long as the case body (110) and the lower plate (130) can be connected, and various modifications and changes are possible.

[0068] A battery pack (100) according to one embodiment of the present invention additionally includes a guide member (144). The guide member (144) allows components (members) to be temporarily assembled (temporarily joined) before being fastened together. For example, as in the example of FIG. 7, before fastening the case body (110) and the lower plate (130) with the fastening member, the guide member (144) allows the case body (110) and the lower plate (130) to be temporarily assembled together. The guide member (144) is disposed at a portion of the coupling portion (113) of the case body (110) or a portion of the coupling portion (143) of the lower plate (130) so that the case body (110) and the lower plate (130) can be temporarily assembled together. Meanwhile, the shape and structure of the guide member (144) of the present invention are not limited to those described above, and any one that can be used for pre-assembly is sufficient, and can be applied by being modified and changed in various ways.

[0069]

[0070] Fig. 9 is an enlarged view of the drain and filter unit of the lower plate of Fig. 5. Fig. 10 is an exploded perspective view of Fig. 9. Fig. 11 illustrates an example of a filter unit being coupled to the drain of the lower plate.

[0071] First, referring back to FIG. 6, the filter unit (160) includes a filter body (161) and a filter cover (162) for fixing the filter body (161). This filter unit (160) is mounted on an open drain port (142). The drain port (142) includes a plurality of openings in the shape of slits (142a), thereby preventing the inflow of foreign substances from the outside, and the filter unit (160) can be mounted thereon.

[0072] The filter unit (160) can be mounted in a detachable manner. Therefore, if necessary, the filter body (161) or the filter cover (162) can be replaced. While filtering external moisture, water, dust, etc. entering through the drain hole (142) in the filter body (161), moisture inside the battery pack (100) can be discharged to the outside by gravity. In addition, the filter body (161) can prevent external moisture or small water droplets splashing from the floor surface (ground, etc.) on which the battery pack (100) is mounted from entering the battery pack (100), while moisture inside the battery pack (100) condenses into a liquid and collects in the drain hole (142) along the floor surface (141) of the lower plate (140), so that it can pass through the filter body (161) and be discharged to the outside.

[0073] Additionally, in the event of a flame or the like occurring inside the battery pack (100), the flame or spark can be blocked in the filter body (161) to prevent it from being exposed to the outside. The filter body (161) applied to the present invention may be, for example, a porous filter, and it is sufficient if it has dustproof, waterproof, and flame-retardant performance, and filter bodies (161) of various structures and materials can be employed. Alternatively, although not illustrated in the present invention, the filter body (161) may be formed of a plurality of layers, each of which may be at least one of a dustproof filter, a waterproof filter, and a flame-retardant filter. In this case, a mesh filter may be included.

[0074] Referring to FIGS. 9 and 10, the filter cover (162) covers the filter body (161, see FIG. 6) so that the filter body (161) can be fixed to the drain port (142). In FIGS. 9 and 10, the filter body (161) is omitted for convenience of understanding. The filter cover (162) can be connected to the drain port (142) by a hook connection as described below.

[0075] In addition, the filter cover (162) includes openings in the shape of multiple slits (162a). Accordingly, foreign substances such as external insects or stones can be blocked, preventing them from entering the battery pack (100). In addition, the drain hole (142) also includes openings in the shape of multiple slits (142a).

[0076] The direction of the plurality of slits (142a) of the drain port (142) (the longitudinal direction of each slit) and the direction of the plurality of slits (162a) of the filter cover (162) (the longitudinal direction of each slit) intersect each other. Accordingly, the plurality of slits (142a) of the drain port (142) and the plurality of slits (162a) of the filter cover (162) are combined with each other to have a single mesh shape. For example, as illustrated in FIGS. 9 and 10, the direction of the plurality of slits (142a) of the drain port (142) and the direction of the plurality of slits (162a) of the filter cover (162) may be orthogonal to each other. Meanwhile, the direction of the plurality of slits (142a) of the drain port (142) and the direction of the plurality of slits (162a) of the filter cover (162) are not limited to those illustrated in the present invention, and various modifications and changes are possible.

[0077] In addition, a hook (142b) is included at the edge of the drain port (142), and a hook ring (162b) is also included at the edge of the filter cover (162). In addition, the hook (142b) of the drain port (142) and the hook ring (162b) of the filter cover (162) are provided at positions corresponding to each other. Accordingly, the drain port (142) and the filter cover (162) can be detachably coupled. Fig. 11 is an enlarged illustration of a case where the hook (142b) of the drain port (142) is coupled to the hook ring (162b) of the filter cover (162). A set of the hook (142b) of the drain port (142) and the hook ring (162b) of the filter cover (162) may be provided in multiple pieces, and further, the hooks and the hook rings may be arranged in opposite directions, and the number and arrangement of the hook combinations are not limited to those illustrated in the present invention, and various modifications and changes are possible. In addition, in addition to the hook connection, various connection methods can be applied as long as the filter cover (162) can be detachably provided on the drain (142).

[0078] According to the embodiments of the present invention described above, it is possible to facilitate the discharge of moisture generated within the battery pack and energy storage device, and to maximize waterproof, dustproof, and flame-retardant performance. Accordingly, the quality of the battery pack and energy storage device can be improved.

[0079] Meanwhile, in the above-described embodiment of the present invention, a case in which the pack case (10) includes a case body (110), an upper plate (120), and a lower plate (130), and the above-described drain port (142) and filter unit (160) are provided on the lower plate (130) has been described as one embodiment. However, the present invention is not limited to the above-described embodiment, and the detailed components of the pack case (10) can be implemented by dividing them in various ways, and for example, it can be implemented in the manner illustrated in FIG. 13. In this case, it is sufficient if the above-described drain port (142) and filter unit (160) are implemented in a manner in which they are provided on the lower surface of the pack case (10).

[0080] Figure 12 illustrates a cross-sectional view of a connector that can be provided in the pack case of the battery pack of Figure 2.

[0081] First, the pack case (10) of the battery pack (100) of FIG. 2 may additionally include an electric unit (30) therein. The electric unit (30) includes various electric components capable of managing or controlling the cell module assembly, and may include, for example, a BMS (Battery Management System) and various cables. The electric unit (30) refers to an electric unit provided in a typical battery pack, and FIG. 12 illustrates some examples of the electric unit (30), and it should be noted that the embodiment according to the present invention is not limited to what is illustrated.

[0082] A connector (170) that electrically connects the electric unit (30) provided inside the battery pack (100) and the external wire (40) outside the battery pack (100) may be provided in the pack case (10). One end of the connector (170) (the end facing the outside of the battery pack) is electrically connected to the external wire (40). Similarly, the other end of the connector (170) (the end facing the inside of the battery pack) is electrically connected to the electric unit.

[0083] One end of the connector (170) (the end facing the outside of the battery pack) is positioned so as to face downward rather than horizontally. The connector (170) may be positioned so as to slope downward as it goes from the inside to the outside of the pack case (10).

[0084] Accordingly, the point having the lowest height of the external wire (40), i.e., the lowest point (P), is formed on the outside of the connector (170). More preferably, the lowest point (P) of the connector (170) is formed on the outside of the battery pack (100). Moisture due to external snow, rain, etc. may flow along the external wire (40), and as illustrated in FIG. 12, the moisture flowing along the external wire (40) is prevented from entering the connector (170). Accordingly, the moisture flowing along the external wire (40) is prevented from affecting the electric unit (30) provided inside the battery pack (100) such as by a short circuit.

[0085] The connector (170) may be a waterproof connector (gland). Although not specifically illustrated in FIG. 2, the connector (170) may be provided on at least one of the four sides of the front, rear, left, and right sides of the pack case (10) of the battery pack of FIG. 2.

[0086] Fig. 13 is a perspective view of a battery pack according to another embodiment of the present invention. Fig. 14 is an exploded perspective view of the pack case of Fig. 13.

[0087] In the embodiment according to Fig. 13, the battery pack (100') is illustrated by modifying the shape and structure of the pack case (10') from the battery pack (100) of Fig. 2. The pack case (10') may be provided with a case body (110') and a door (110a) provided on one surface of the case body (110'). In Fig. 14, the case body (110') and the door (110a) are illustrated in an exploded manner. The door (110a) may be integrally detachable from the case body (110') as illustrated in Fig. 14, and in some cases, one edge of the door (110a) may be hinged to the case body (110').

[0088] The pack case (10') of the door (110a) of Fig. 13 may additionally include a connector receiving portion (180) formed concavely inward from the outer surface provided on one side of the pack case (10'). By mounting the connector (170) in the connector receiving portion (180), the connector receiving portion (180) can serve as an eaves protecting the connector (170), and can prevent the connector (170) from being directly exposed to external snow, rain, wind, etc.

[0089] As can be seen in the enlarged cross-sectional view of the connector (170) and connector receiving portion (180) of Fig. 13, one end of the connector (170) (the end facing the outside of the battery pack) is positioned so as to face downward rather than horizontally. The connector (170) may be positioned so as to slope downward as it goes from the inside to the outside of the pack case (10).

[0090] A more specific description of the battery pack (100') of FIG. 13 overlaps with that described above with respect to the battery pack (100) of FIGS. 2 to 12, so refer to that described above with respect to FIGS. 2 to 12.

[0091] A battery pack according to one embodiment of the present invention can be applied to various devices. For example, devices to which the battery pack is applied may be means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles. However, the above-described devices are not limited thereto, and the battery pack according to the present embodiment can be used in various devices other than the above-described examples, and this also falls within the scope of the present invention.

[0092] Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements made by those skilled in the art using the basic concept of the present invention defined in the following claims also fall within the scope of the present invention.

[0093] [Explanation of symbols]

[0094] 10, 10': Pack Case

[0095] 20: Cell module assembly

[0096] 30: Battlefield Unit

[0097] 40: External wire

[0098] 100, 100': Battery pack

[0099] 110, 110': Case body

[0100] 111: Border

[0101] 112: Opening

[0102] 113: Joint

[0103] 110a: Door

[0104] 120: Top plate

[0105] 130: Lower plate

[0106] 140: Lower cover body

[0107] 141: Floor surface

[0108] 142: Drain

[0109] 142a: Slit

[0110] 142b: Hook

[0111] 143: Joint

[0112] 144: Absence of guide

[0113] 150: Sealing member

[0114] 160: Filter unit

[0115] 161: Filter body

[0116] 162: Filter cover

[0117] 162a: Slit

[0118] 162b: Hook loop

[0119] 170: Connector

[0120] 180: Connector receptacle

Claims

1. A cell module assembly comprising a plurality of battery cells; and Includes a pack case that houses the cell module assembly inside, A battery pack, wherein the pack case includes a drain port and a filter unit is mounted in the drain port.

2. In paragraph 1, The above filter unit includes a filter body and a filter cover covering the filter body, A battery pack, wherein the drain includes a plurality of slit-shaped openings, and the filter cover includes a plurality of slit-shaped openings.

3. In paragraph 2, A battery pack in which the longitudinal direction of the slit of the above drain and the longitudinal direction of the slit of the above filter cover intersect each other.

4. In paragraph 2, A battery pack, wherein the filter body is mounted on the plurality of slits of the drain port so as to be interposed between the drain port and the filter cover.

5. In paragraph 1, The above filter body is a battery pack that filters external moisture, water, and dust entering through the drain, but discharges moisture inside the battery pack to the outside.

6. In paragraph 1, The above filter body and the above filter cover are detachable from the drain port, and are a battery pack.

7. In paragraph 1, The above filter cover is hook-attached to the drain port, the battery pack.

8. In paragraph 1, A battery pack, wherein the pack case includes a case body and a lower plate disposed at the lower portion of the case body.

9. In paragraph 8, The upper surface of the lower plate has a slope that gradually decreases in height toward the drain, A battery pack, wherein the height of the upper surface of the filter cover mounted on the drain is equal to or lower than the height of the upper surface of the lower plate.

10. In paragraph 8, A battery pack comprising an open end at the lower portion of the case body, and the lower plate is coupled to the open end to cover the open end.

11. In paragraph 10, A battery pack further comprising a sealing member provided on the joining surface of the case body and the lower plate.

12. In paragraph 1, The above pack case includes a connector that is electrically connected between an external wire and a power unit provided inside the battery pack, A battery pack, wherein the connector is coupled to the pack case such that one end of the connector facing the outside of the pack case faces downward rather than in a horizontal direction.

13. In paragraph 12, A battery pack, wherein the connector is coupled to the pack case so that it slopes downward from the inside to the outside of the pack case.

14. In paragraph 12, The above pack case includes a connector receiving portion formed concavely inward from the outer surface of the pack case, A battery pack, wherein the connector is coupled to the connector receptacle.

15. In paragraph 12, The above connector is a waterproof connector, battery pack.

16. An energy storage device comprising a battery pack according to paragraph 1.

Images