Battery pack and device including same

Abstract

A battery pack according to one embodiment of the present invention comprises: a first case in which a first cell module assembly is accommodated; and a second case in which a second cell module assembly stacked on the first cell module assembly is accommodated, and which can be coupled to and separated from the first case, wherein a lower coupling part that can be moved is formed on the inner surface of the second case, and an upper coupling part that is to be coupled to at least a portion of the lower coupling part can be formed at the upper part of the first case.

Description

Battery pack and device including the same

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

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2025-0013757 filed February 4, 2025, and all contents disclosed in the document of said Korean patent application are incorporated herein as part of this specification.

[0003] The present invention relates to a battery pack and a device including the same, and more specifically, to a battery pack including a movable plunger and a push plate and a device including the same.

[0004] In modern society, as the use of portable devices such as mobile phones, laptops, camcorders, and digital cameras, as well as energy storage devices, has become commonplace, the development of technologies in related fields is becoming active. Furthermore, rechargeable secondary batteries are being utilized as power sources for electric vehicles (EVs), hybrid electric vehicles (HEVs), and plug-in hybrid electric vehicles (P-HEVs) as a solution to address air pollution caused by conventional gasoline vehicles using fossil fuels; consequently, the need for the development of secondary batteries is increasing.

[0005] Currently commercialized rechargeable batteries include nickel-cadmium, nickel-hydrogen, nickel-zinc, and lithium-ion batteries. Among these, lithium-ion 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 lithium secondary batteries primarily use lithium-based oxides and carbon materials as the positive and negative active materials, respectively. The lithium secondary battery comprises an electrode assembly in which a positive plate and a negative plate, each coated with the positive and negative active materials, are arranged with a separator in between, and an outer casing, namely a battery case, that seals and houses the electrode assembly together with an electrolyte.

[0007] Generally, lithium secondary batteries can be classified according to the shape of the casing into cylindrical secondary batteries, in which the electrode assembly is embedded in a cylindrical metal can, and pouch-type secondary batteries, in which the electrode assembly is embedded in a pouch of aluminum laminate sheet.

[0008] These secondary batteries are widely used in the form of battery packs not only in small devices such as portable electronic devices but also in medium-to-large devices such as electric vehicles and Energy Storage Systems (ESS). Battery packs used in medium-to-large devices can be configured such that multiple battery cells are stacked to form a battery module, and multiple such battery modules are housed in a pack case. Additionally, a battery pack can be configured such that a stack of multiple battery cells is wrapped in a frame to form a Cell Module Assembly (CMA), and multiple such Cell Module Assemblies are directly stacked.

[0009] In the case of a structure where multiple cell module assemblies are directly stacked, each cell module assembly is housed in a separate enclosure, and the enclosures may be stacked vertically. In this case, a structure is required that facilitates connection and separation while maintaining a certain level of bonding force between the enclosures. Additionally, it is necessary to prevent the bonding structure between the enclosures from being exposed to the outside, thereby preventing the bonding structure from being damaged by the external environment.

[0010] The present invention aims to facilitate the joining and separating of cases containing cell module assemblies by using a plunger and a push plate formed on the inner surface of a case, while preventing damage caused by the external environment by ensuring that the joining structure is not exposed to the outside.

[0011] However, the problems that the embodiments of the present invention aim to solve 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 first case in which a first cell module assembly is housed; a second case in which a second cell module assembly stacked on the first cell module assembly is housed and which is coupled and separable from the first case, wherein a lower coupling portion configured to be movable is formed on the inner surface of the second case, and an upper coupling portion formed on the upper surface of the first case that is coupled with at least a part of the lower coupling portion may be formed.

[0013] The lower coupling portion includes a plunger in which at least a portion is movable, and the upper coupling portion may have a fastening hole formed therein into which at least a portion of the plunger is inserted.

[0014] The above plunger comprises a fastening member configured to be movable and inserted into the fastening hole of the first case; and an elastic member that moves the fastening member using elastic force, and as the second case moves downward, the fastening member is pushed backward by the upper coupling part and then advanced to an initial position by the elastic member and inserted into the fastening hole, thereby allowing the first case and the second case to be coupled.

[0015] The lower coupling portion further includes a push plate formed below the fastening member on the inner surface of the second case, and when the first case and the second case are coupled, the push plate moves upward to push the fastening member backward, thereby causing the fastening member to detach from the fastening hole and the first case and the second case can be separated.

[0016] A curved surface may be formed on the upper connecting portion of the above-mentioned fastening member or on the portion in contact with the push plate.

[0017] The above fastening member can move in a direction perpendicular to the direction in which the first cell module assembly and the second cell module assembly are stacked.

[0018] The plunger further includes a fixing member fixed to the second case, and the elastic member may have one side connected to the fastening member and the other side connected to the fixing member.

[0019] The above push plate may be formed to extend long along the perimeter of the inner surface of the second case.

[0020] The above push plate can move along the direction in which the first cell module assembly and the second cell module assembly are stacked.

[0021] The second cell module assembly may include a battery cell stack; and an assembly frame in which the battery cell stack is housed.

[0022] In the assembly frame, a protrusion is formed extending from the corner of the lower surface of the assembly frame in a direction parallel to the extension direction of the lower surface of the assembly frame, and the push plate can be seated on the protrusion of the assembly frame.

[0023] The above protrusion may be formed by extending from the vertex of the lower surface of the assembly frame.

[0024] A locking projection is formed on the above protrusion, protruding upward from the above protrusion, and a locking portion is formed on the above push plate, recessed inward from the inner surface of the second case toward the internal space in which the second cell module assembly is housed, and the above push plate can be seated on the protrusion of the assembly frame while the above locking portion is engaged with the locking projection.

[0025] The second case above has an open top and bottom, and one or more handles may be provided on the upper surface of the second cell module assembly.

[0026] A device according to one embodiment of the present invention may include the battery pack.

[0027] According to embodiments of the present invention, a plurality of cases are joined and separated through a plunger and a push plate formed on an inner surface, thereby facilitating joining and separating, and preventing damage caused by the external environment by ensuring that the joining structure is not exposed to the outside.

[0028] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by those skilled in the art from the description in the claims.

[0029] FIG. 1 is a perspective view of a battery pack according to one embodiment of the present invention.

[0030] Figure 2 is an exploded perspective view of the battery pack shown in Figure 1.

[0031] FIG. 3 is a cross-sectional view taken along III-III' of FIG. 1, showing two cell module assemblies and a case stacked vertically.

[0032] FIG. 4 is a diagram showing the configuration of a plunger according to one embodiment of the present invention.

[0033] Figure 5 is an enlarged view of section A of Figure 3.

[0034] Figure 6 is an enlarged view of section B of Figure 2.

[0035] Figure 7 is an enlarged view of section C of Figure 2.

[0036] FIGS. 8 and 9 are drawings for explaining the principle of combining a first case and a second case according to an embodiment of the present invention.

[0037] FIGS. 10 to 12 are drawings for explaining the principle of separating a first case and a second case according to an embodiment of the present invention.

[0038] 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 present invention. The present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0039] To clearly explain the present invention, parts unrelated to the explanation have been omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0040] Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present invention is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, for convenience of explanation, the thickness of some layers and regions has been exaggerated in the drawings.

[0041] Furthermore, when a part such as a layer, membrane, region, or plate is said to be "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when a part is said to be "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" facing the opposite direction of gravity.

[0042] Meanwhile, although terms indicating directions such as up, down, left, right, front, and back may be used in this specification, these terms are used merely for convenience of explanation and may vary depending on the location of the object or the position of the observer, as is obvious to those skilled in the art of this invention.

[0043] Furthermore, throughout the specification, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0044] Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side.

[0045] FIG. 1 is a perspective view of a battery pack according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the battery pack shown in FIG. 1. FIG. 3 is a cross-sectional view taken along III-III' of FIG. 1, showing two cell module assemblies and a case stacked vertically. FIG. 4 is a diagram showing the configuration of a plunger according to an embodiment of the present invention. FIG. 5 is an enlarged view of section A of FIG. 3. FIG. 6 is an enlarged view of section B of FIG. 2. FIG. 7 is an enlarged view of section C of FIG. 2.

[0046] Referring to FIGS. 1 to 7, a battery pack (100) according to one embodiment of the present invention may include a plurality of cell module assemblies (200), a plurality of cases (300) in which each of the cell module assemblies (200) is housed, a base part (400) that supports the lower part of the cell module assembly (200) placed at the bottom and the case (300), and a protection part (500) that covers the open upper surface of the cell module assembly (200) placed at the top.

[0047] The cell module assembly (200) may include a battery cell stack (120) in which a plurality of battery cells (110) are stacked. The battery cell stack (120) may be formed by stacking a plurality of battery cells (110) in one direction. The battery cells (110) may be pouch-type battery cells. The battery cells (110) may be manufactured by housing an electrode assembly in a pouch case made of a laminate sheet including a resin layer and a metal layer, and then heat-sealing the sealing portion of the pouch case. There may be a plurality of such battery cells (110), and a battery cell stack (120) may be formed in which the plurality of battery cells (110) are stacked so that they can be electrically connected to each other.

[0048] The cell module assembly (200) may include an assembly frame (130) in which a battery cell stack (120) is housed. The assembly frame (130) may cover at least a portion of the battery cell stack (120). The assembly frame (130) may cover the upper and lower surfaces and the sides of the battery cell stack (120). The assembly frame (130) in which the battery cell stack (120) is housed may be placed in the internal space of a case (300).

[0049] One or more handles (133) may be provided on the upper surface of the assembly frame (130). A worker assembling the battery pack (100) can use the handles (133) to lift and move the cell module assembly (200).

[0050] A protrusion (131) may be formed on the lower corner of the assembly frame (130). The protrusion (131) may be formed by extending from the corner of the lower surface of the assembly frame (130) in a direction parallel to the expansion direction of the lower surface of the assembly frame (130). The protrusion (131) may be formed by extending from the vertex of the lower surface of the assembly frame (130) in a direction parallel to the expansion direction of the lower surface of the assembly frame (130). When the cell module assembly (200) is housed in the case (300), the push plate (332), which will be described later, may be seated on the protrusion (131) of the assembly frame (130).

[0051] A locking projection (132) may be formed on the protrusion (131). The locking projection (132) may be formed to protrude upward from the protrusion (131). When the cell module assembly (200) is housed in the case (300), the push plate (332) may be seated on the protrusion (131) with the locking portion (3321) of the push plate (332) caught on the locking projection (132) of the assembly frame (130).

[0052] At least a portion of the cell module assembly (200) may be covered by a case (300). The side of the cell module assembly (200) may be covered by the case (300). At this time, the open upper and lower surfaces of the cell module assembly (200) may be covered by another cell module assembly (200), a base part (400), or a protective part (500) stacked on the upper and lower parts. Thus, the battery pack (100) according to one embodiment of the present invention may have a structure in which a plurality of cell module assemblies (200) and a plurality of cases (300) are stacked, and specific details regarding this will be described later.

[0053] The case (300) may be formed to cover at least a portion of the cell module assembly (200). An internal space may be formed in the case (300), and the cell module assembly (200) may be placed in this internal space. The case (300) may be composed of a plurality of side walls (310) and may have an open top and bottom. Accordingly, with the cell module assembly (200) placed in the internal space of the case (300), the side of the cell module assembly (200) may be covered by the side walls (310) of the case (300). As described above, the battery pack (100) according to one embodiment of the present invention may have a structure in which a plurality of cell module assemblies (200) are stacked vertically. Accordingly, the case (300) may also be a plurality of cases to cover each cell module assembly (200).

[0054] The case (300) may include an upper connecting part (320) and a lower connecting part (330).

[0055] The lower connecting portion (330) may be formed on the inner surface of the case (300). The lower connecting portion (330) may be formed on the lower part of the inner surface of the case (300). The lower connecting portion (330) may be formed on the lower side of the inner surface of the case (300). In other words, based on the vertical direction (the z-axis direction in the drawing), the lower connecting portion (330) may be formed below the midpoint on the inner surface of the case (300). The lower connecting portion (330) may be configured so that at least a part of it is movable. The lower connecting portion (330) may include a movable plunger (331) and a push plate (332).

[0056] The plunger (331) may be configured so that at least a portion thereof is movable. The movable portion of the plunger (331) may be inserted into a fastening hole (321) formed in the upper coupling portion (320) of another case (300) positioned below. Accordingly, the cases (300) stacked vertically may be joined.

[0057] The plunger (331) may include a fastening member (3311), an elastic member (3312), and a fixing member (3313).

[0058] The fastening member (3311) may be configured to be movable. The fastening member (3311) may move in the vertical direction and perpendicular direction. Here, the vertical direction refers to the direction in which a plurality of cell module assemblies (200) and a plurality of cases (300) are stacked (the z-axis direction in the drawing). The fastening member (3311) may be pushed backward by the push plate (332) or the upper coupling part (320) of another case (300) positioned below. The fastening member (3311) may be advanced to an initial position by the elastic member (3312). A curved surface may be formed on at least a portion of the fastening member (3311). The fastening member (3311) may be pushed and moved by the uppermost part of the push plate (332) or the upper coupling part (320) of another case (300). At this time, a curved surface may be formed on the portion of the fastening member (3311) that contacts the uppermost part of the upper coupling portion (320) of the push plate (332) or another case (300). This curved surface may be formed on the lower part of the fastening member (3311). The fastening member (3311) may be inserted into a fastening hole (321) formed in the upper coupling portion (320) of the other case (300) positioned below.

[0059] The elastic member (3312) can be connected to the fastening member (3311) and the fixing member (3313). One side of the elastic member (3312) may be connected to the fastening member (3311), and the other side may be connected to the fixing member (3313). The elastic member (3312) can move the fastening member (3311) using elastic force. More specifically, the elastic member (3312) can advance the fastening member (3311), which is in a retracted state by the push plate (332) or the upper coupling part (320) of another case (300) placed below, to its initial position using elastic force. The elastic member (3312) may be a spring. However, the elastic member (3312) is not necessarily limited to a spring, and may be composed of various materials and shapes capable of moving the fastening member (3311) using elastic force.

[0060] The fixed member (3313) can be connected to the elastic member (3312). The fixed member (3313) can be connected to the other side of the elastic member (3312). The fixed member (3313) can be fixed to the side wall (310) of the case (300). The fixed member (3313) can be fixed to the side wall (310) of the case (300) through a bolt fastening method, etc.

[0061] A push plate (332) may be formed on the inner surface of the case (300). The push plate (332) may be formed extending along the perimeter of the inner surface of the case (300). The push plate (332) may be located below the plunger (331). The push plate (332) may be located below the fastening member (3311) of the plunger (331) on the inner surface of the case (300). The push plate (332) may be configured to be movable. The push plate (332) may move along the up and down direction. A locking portion (3321) may be formed on at least a portion of the push plate (332), which is indented in the direction from the inner surface of the case (300) toward the internal space. With the cell module assembly (200) housed in the case (300), the push plate (332) can be seated on the protrusion (131) of the assembly frame (130) with the locking portion (3321) of the push plate (332) caught on the locking projection (132) of the assembly frame (130).

[0062] The upper connecting portion (320) may be formed on the upper part of the case (300). The upper connecting portion (320) may be formed on the top of the case (300). The upper connecting portion (320) may be a wall shape extending upward from the top of the side wall (310) of the case (300). The upper connecting portion (320) may be connected to at least a portion of the lower connecting portion (330) of another case (300) stacked on top. A fastening hole (321) may be formed in the upper connecting portion (320). At least a portion of the plunger (331) of the lower connecting portion (330) of the other case (300) may be inserted into the fastening hole (321). A fastening member (3311) of the lower connecting portion (330) of the other case (300) may be inserted into the fastening hole (321). Accordingly, cases (300) stacked vertically can be combined.

[0063] FIGS. 8 and 9 are drawings for explaining the principle of combining a first case (300a) and a second case (300b) according to an embodiment of the present invention. Specifically, FIG. 8 is a drawing showing the second case (300b) moving downward while the second cell module assembly (220) is stacked on the first cell module assembly housed in the first case (300a). FIG. 9 is a drawing for explaining the principle of inserting a fastening member (3311) of the second case (300b) into a fastening hole (321) formed in the upper coupling part (320) of the first case (300a).

[0064] FIGS. 10 to 12 are drawings for explaining the principle of separation of a first case (300a) and a second case (300b) according to an embodiment of the present invention. Specifically, FIG. 10 is a drawing showing the first case (300a) and the second case (300b) combined. FIG. 11 is a drawing showing the push plate (332) seated on the protrusion (131) of the assembly frame (130). FIG. 12 is a drawing for explaining the principle of detachment of the fastening member (3311) of the second case (300b) from the fastening hole (321) of the first case (300a).

[0065] Referring to FIGS. 8 to 12, the principle of combining and separating a plurality of cases (300) housing a cell module assembly (200) according to one embodiment of the present invention will be explained in detail.

[0066] Before describing, a battery pack (100) according to one embodiment of the present invention may include a plurality of cell module assemblies (200) and a plurality of cases (300). The cell module assembly (200) may include a first cell module assembly (not shown) and a second cell module assembly (220). The case (300) may include a first case (300a) and a second case (300b). The first cell module assembly and the second cell module assembly (220), respectively, may be housed in the internal space of the first case (300a) and the second case (300b). The second cell module assembly (220) may be stacked on the first cell module assembly. The first case (300a) and the second case (300b) may be configured to be connectable and separable. The first case (300a) may include an upper coupling portion (320), and a fastening hole (321) may be formed in the upper coupling portion (320) of the first case (300a). The second case (300b) may include a lower coupling portion (330). The lower coupling portion (330) of the second case (300b) may include a plunger (331) and a push plate (332). The plunger (331) may include a fastening member (3311), an elastic member (3312), and a fixing member (3313).

[0067] First, referring to FIGS. 8 and 9, for the combination of the first case (300a) and the second case (300b), the second case (300b), which is positioned on the upper part of the first case (300a), can move downward toward the first case (300a). As the second case (300b) moves downward, the fastening member (3311) of the plunger (331) of the second case (300b) is pushed backward by the uppermost part of the upper coupling portion (320) of the first case (300a), and then advances to an initial position by the elastic member (3312) and can be inserted into the fastening hole (321) of the first case (300a). Accordingly, the first case (300a) and the second case (300b) can be combined.

[0068] More specifically, as the second case (300b) moves downward toward the first case (300a), the lower part of the fastening member (3311) of the plunger (331) of the second case (300b) may come into contact with the uppermost part of the upper coupling portion (320) of the first case (300a). In this state, if additional downward force is applied to the second case (300b), the fastening member (3311) of the second case (300b) may be pushed backward by the uppermost part of the upper coupling portion (320) of the first case (300a). At this time, the direction of the force applied to the fastening member (3311) of the second case (300b) by the uppermost part of the upper coupling portion (320) of the first case (300a) is upward, and the direction in which the fastening member (3311) moves backward may be perpendicular to the direction in which the force is applied. As described above, since a curved surface may be formed at the portion where the fastening member (3311) of the second case (300b) contacts the uppermost part of the upper coupling portion (320) of the first case (300a), the fastening member (3311) may move in a direction different from the direction of the force applied to the fastening member (3311). When the fastening member (3311) of the second case (300b) moves further downward while in a retracted state, the fastening member (3311) may reach the fastening hole (321) formed in the upper coupling portion (320) of the first case (300a). At this time, the fastening member (3311) may advance to an initial position by the elastic force of the elastic member (3312) connected to the fastening member (3311), and the fastening member (3311) may be inserted into the fastening hole (321). Accordingly, the first case (300a) and the second case (300b), which are stacked vertically, can be combined. In this way, according to the present invention, the first case (300a) and the second case (300b) can be easily combined simply by pressing the second case (300b), which is stacked on top of the first case (300a), downward.

[0069] Referring to FIGS. 10 and 12, when the first case (300a) and the second case (300b) are combined, the push plate (332) of the second case (300b) can move upward to push the fastening member (3311) of the second case (300b) backward. Accordingly, the fastening member (3311) can be disengaged from the fastening hole (321) of the first case (300a), and the first case (300a) and the second case (300b) can be separated.

[0070] More specifically, when the first case (300a) and the second case (300b) are combined, the upper surface of the second case (300b) is open, so the second cell module assembly (220) can be moved upward using a handle (133) placed on the upper surface of the second cell module assembly (220). At this time, the push plate (332) formed on the inner surface of the second case (300b) may be seated on the protrusion (131) with the locking part (3321) caught on the locking projection (132) of the assembly frame (130). Additionally, the push plate (332) may be located below the fastening member (3311). Therefore, when the second cell module assembly (220) is lifted using the handle (133), the second cell module assembly (220) and the push plate (332) seated thereon can move upward together. The push plate (332) moving upward can push and retract the fastening member (3311) positioned on the upper side. Accordingly, the fastening member (3311) of the second case (300b) can be disengaged from the fastening hole (321) of the first case (300a), thereby separating the first case (300a) and the second case (300b). Thus, according to one embodiment of the present invention, the first case (300a) and the second case (300b) can be easily separated simply by lifting the second cell module assembly (220) stacked on the upper side.

[0071] Consequently, the battery pack (100) according to one embodiment of the present invention can easily connect and disconnect the cases (300) because the plunger (331) and the push plate (332) are configured to be movable while ensuring a certain level of coupling force between the cases (300) through a structure in which the plunger (331) is inserted into the fastening hole (321). In addition, since the coupling structure between the cases (300) is formed on the inner surface of the case (300) and is not exposed to the outside, damage to the coupling structure by the external environment can be prevented.

[0072] The battery module and the battery pack containing the same described above can be applied to various devices. Such devices may be applied to means of transportation such as electric bicycles, electric vehicles, and hybrid vehicles, but the present invention is not limited thereto and can be applied to various devices capable of using the battery module and the battery pack containing the same, and this also falls within the scope of the present invention.

[0073] Although 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 by those skilled in the art using the basic concept of the present invention as defined in the following claims also fall within the scope of the present invention.

[0074] [Explanation of the symbol]

[0075] 100: Battery pack

[0076] 110: Battery cell

[0077] 120: Battery cell laminate

[0078] 130: Assembly Frame

[0079] 131: Protrusion

[0080] 132: Stopping protrusion

[0081] 133: Handle

[0082] 200: Cell Module Assembly

[0083] 300: Case

[0084] 310: Sidewall

[0085] 320: Upper connecting part

[0086] 321: Fastening hole

[0087] 330: Lower connecting part

[0088] 331: Plunger

[0089] 332: Push Plate

[0090] 400: Base section

[0091] 500: Protection Department

Claims

1. A first case in which the first cell module assembly is housed; A second cell module assembly stacked on the first cell module assembly is housed therein, and the second case is coupled and separable from the first case. A lower coupling portion configured to be movable is formed on the inner surface of the second case above, and A battery pack having an upper coupling portion formed on the upper part of the first case that is coupled with at least a part of the lower coupling portion.

2. In Paragraph 1, The above lower coupling part includes a plunger in which at least a portion is movable, and A battery pack having a fastening hole formed in the upper coupling portion into which at least a portion of the plunger is inserted.

3. In Paragraph 2, The above plunger is, A fastening member configured to be movable and inserted into the fastening hole of the first case; and It includes an elastic member that moves the fastening member using elastic force, and A battery pack in which the first case and the second case are combined by the fastening member being pushed backward by the upper coupling part as the second case moves downward, and then advancing to an initial position by the elastic member and being inserted into the fastening hole.

4. In Paragraph 3, The lower coupling portion further includes a push plate formed below the fastening member on the inner surface of the second case, and A battery pack in which, with the first case and the second case combined, the push plate moves upward to push the fastening member backward, thereby causing the fastening member to detach from the fastening hole and the first case and the second case to be separated.

5. In Paragraph 4, A battery pack having a curved surface formed on the upper coupling portion of the above-mentioned fastening member or the portion in contact with the above-mentioned push plate.

6. In Paragraph 5, The above fastening member is a battery pack capable of moving in a direction perpendicular to the direction in which the first cell module assembly and the second cell module assembly are stacked.

7. In Paragraph 4, The above plunger further includes a fixing member fixed to the second case, and The above elastic member is a battery pack in which one side is connected to the fastening member and the other side is connected to the fixing member.

8. In Paragraph 4, The above push plate is formed to extend along the inner circumference of the second case, forming a battery pack.

9. In Paragraph 8, The above push plate is a battery pack movable along the direction in which the first cell module assembly and the second cell module assembly are stacked.

10. In Paragraph 9, The above second cell module assembly is, Battery cell stack; and A battery pack comprising an assembly frame in which the above-mentioned battery cell stack is housed.

11. In Paragraph 10, In the assembly frame, a protrusion is formed extending from the corner of the lower surface of the assembly frame in a direction parallel to the extension direction of the lower surface of the assembly frame. The above push plate is a battery pack that is seated on a protrusion of the assembly frame.

12. In Paragraph 11, The above-mentioned protrusion is a battery pack formed by extending from the vertex of the lower surface of the assembly frame.

13. In Paragraph 11, On the above protrusion, a locking projection is formed that protrudes upward from the above protrusion, and The above push plate has a locking portion formed therein that is recessed from the inner surface of the second case toward the internal space in which the second cell module assembly is housed. A battery pack in which the push plate is seated on the protrusion of the assembly frame while the above-mentioned locking part is engaged with the above-mentioned locking projection.

14. In Paragraph 13, The second case above is in the form of having the top and bottom open, and A battery pack having one or more handles provided on the upper surface of the second cell module assembly.

15. A device comprising the battery pack of claim 1.

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