Battery pack assembly using a rotating handle

Abstract

The present invention relates to a battery pack assembly using a rotating handle and an elastic member, and provides a battery pack assembly including: a battery pack having a cover on an upper portion; a rod-shaped handle rotatably installed on an upper surface of the battery pack cover, which rotates between an unlocked position where both end portions are located within the upper surface range of the battery pack cover and a locked position where both end portions protrude outside the upper surface range of the battery pack cover; a seat having an internal space for accommodating a battery pack and having grooves formed on the upper portion of the internal side so that both end portions of the handle are inserted and fixed at the locked position; and an elastic member installed between the internal bottom surface of the seat and the lower surface of the battery pack.

Description

[Technical Field]

[0001] The present invention relates to a battery pack assembly, and more particularly to a battery pack assembly having a rotating handle and a fixing groove set using an elastic member.

[0002] This application claims the benefit of priority based on Korean Patent Application No. 10-2022-0000842 dated January 4, 2022, and all contents disclosed in the documents of that Korean patent application are incorporated herein by reference. [Background technology]

[0003] Electric vehicles are powered by batteries, and among them, light electric vehicles (LEVs) include two-wheeled vehicles such as electric bicycles and electric scooters. The battery pack of a light electric vehicle can be a replaceable or swappable pack.

[0004] 1 and 2 show a conventional battery pack assembly, with FIG. 1 showing the seat cover in an open state and FIG. 2 showing the seat cover in a closed state.

[0005] Referring to Figures 1 and 2, a seat (LEV seat) 1 is installed in a light electric vehicle, a battery pack 2 is installed in the seat 1, a seat cover 3 is installed on the top of the seat 1, foam 4 is attached to the underside of the seat cover 3, and a connector 5 is installed on the bottom of the battery pack 2.

[0006] Referring to Figure 2, the conventional pack fixing structure is a pack fixing method that uses the compressive force of foam 4 attached to seat cover 3, and when seat cover 3 is closed, foam 4 attached to seat cover 3 compresses battery pack 2 from above to fix it. However, with long-term repeated use, the compressive force can cause permanent deformation of foam 4, reducing or weakening the compressive force fixing battery pack 2. If the foam is compressed and the force fixing the pack (compressive force) is reduced or weakened, the contact points of connector 5 can weaken or cause contact failure of connector 5, and vibration and impact can damage or break battery pack 2. Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a battery pack assembly that can maintain the fixing force of the battery pack even after repeated use for a long period of time. [Means for solving the problem]

[0008] According to one aspect of the present invention, there is provided a battery pack assembly including: a battery pack having a battery pack cover; a handle rotatably mounted on the battery pack cover and rotatable between an unlocked position where both side ends are located inside the battery pack cover and a locked position where both side ends protrude outside the battery pack cover; a seat having an internal space for accommodating the battery pack, arranged so that both side ends of the handle can be inserted in the locked position and having grooves into which the both side ends of the handle are inserted in the locked position; and an elastic member provided in the internal space of the seat and arranged so that the battery pack is compressed when inserted into the internal space.

[0009] Specifically, a battery pack assembly related to one embodiment of the present invention may include a battery pack having a cover on top, a rod-shaped handle rotatably installed on the top surface of the battery pack cover, and rotating between an unlocked position where both ends are located within the top surface of the battery pack cover and a locked position where both ends protrude beyond the top surface of the battery pack cover, a seat having an internal space for accommodating the battery pack and having grooves formed on the upper part of the internal side so that both ends of the handle can be inserted and fixed in the locked position, and an elastic member (spring) installed between the internal bottom surface of the seat and the bottom surface of the battery pack.

[0010] In the present invention, when the handle is pushed down while it is in the unlocked position, the elastic member is compressed as the battery pack descends, causing the handle to descend. When the handle is rotated to the locked position after it has descended to the position of the groove in the seat, both ends of the handle are inserted into the groove in the seat, and the battery pack can be fixed to the seat.

[0011] In the present invention, when the handle is rotated to the unlock position with both ends of the handle inserted into the grooves of the seat, the both ends of the handle come out of the grooves of the seat, and the battery pack rises due to the restoring force of the elastic member, allowing it to be separated from the seat.

[0012] In the present invention, the groove position of the sheet and the elastic modulus and deformation amount of the elastic member can be set so that the elastic member can be compressed and expanded only within the elastic region.

[0013] In the present invention, the battery pack cover may be formed with a locking step that limits the rotation range of the handle at each of the unlocked and locked positions of the handle.

[0014] In the present invention, the groove of the seat can be formed continuously in the circumferential direction of the seat along the direction of rotation of the steering wheel, at least over the rotation range of the steering wheel.

[0015] The battery pack assembly according to one embodiment of the present invention may further include a cap installed at the rotation center of the handle to prevent the handle from rotating, and a second elastic member installed between the handle and the cap.

[0016] In the present invention, the cap may include an upper member, a rim member extending downward from an edge portion of the upper member, a pair of leg members extending downward from the upper member inside the rim member, and a protruding member extending laterally outward from the lower portion of the leg members.

[0017] In the present invention, the handle may include a second groove into which the edge member of the cap is inserted, a hole into which the leg member of the cap is inserted, a vertical member inserted between the pair of leg members of the cap, a support member extending laterally outward from the lower part of the vertical member, and a third groove formed in the support member into which the protruding member of the cap is inserted.

[0018] In the present invention, the battery pack cover includes a handle mounting member installed at the rotation center of the handle, and the handle mounting member includes a first housing portion that houses the support member of the handle, a second housing portion that houses the vertical member of the handle and the leg member of the cap, and a second locking portion that is installed in the second housing portion and limits the rotation of the protruding member of the cap.

[0019] In the present invention, when the handle is in the unlocked position, the protruding member of the cap can be locked in the second locking step to prevent the handle from rotating.

[0020] In the present invention, when the cap is pushed down while the handle is in the unlocked position, the second elastic member is compressed, causing the protruding member of the cap to escape from the second locking step and be inserted into the third groove of the handle, thereby allowing the handle to rotate. [Effects of the Invention]

[0021] According to one aspect of the present invention, a battery pack assembly uses the compressive force of an elastic member to secure the pack, thereby maintaining the securing force of the battery pack even during repeated use over a long period of time.

[0022] In addition, the battery pack is fixed using the rotating handle and the compressive force of the elastic material inside the seat, eliminating the need for additional parts.

[0023] Furthermore, by applying a cap structure to the handle, the handle can be prevented from rotating when the battery pack is separated from the seat. [Brief explanation of the drawings]

[0024] [Figure 1] 1 shows a conventional battery pack assembly with the seat cover open. [Figure 2] A conventional battery pack assembly is shown with the seat cover closed. [Figure 3] 1 illustrates a battery pack assembly according to an embodiment of the present invention, shown in an unlocked state. [Figure 4] 1 illustrates a battery pack assembly according to an embodiment of the present invention, in a locked state. [Figure 5] The third drawing (FIG. 5(c)) shows a battery pack, handle, and cap in an unlocked state according to one embodiment of the present invention, and is a cross-sectional view taken along line AA of the second drawing (FIG. 5(b)). [Figure 6] The third drawing (FIG. 6(c)) shows a battery pack, handle, and cap in a locked state according to one embodiment of the present invention, and is a cross-sectional view taken along line BB of the second drawing (FIG. 6(b)). [Figure 7] 1 shows a rotation prevention structure based on interference between a cap and a cover according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will now be described in detail with reference to the accompanying drawings.

[0026] 3A and 3B show a battery pack assembly according to an embodiment of the present invention in an unlocked state, in which FIG. 3A is a perspective view of the battery pack assembly, and FIG. 3B is a cross-sectional view of the battery pack assembly.

[0027] 4A and 4B show a battery pack assembly according to an embodiment of the present invention in a locked state, in which (a) is a perspective view of the battery pack assembly and (b) is a cross-sectional view of the battery pack assembly.

[0028] Figure 5 shows a battery pack, handle, and cap in an unlocked state according to one embodiment of the present invention, where (a) in Figure 5 is a perspective view of the battery pack assembly, (b) in Figure 5 is a plan view of the battery pack assembly, and (c) in Figure 5 is a cross-sectional view taken along line AA in (b) in Figure 5.

[0029] 6 shows a battery pack, a handle, and a cap in a locked state according to one embodiment of the present invention, where (a) in FIG. 6 is a perspective view of the battery pack assembly, (b) in FIG. 6 is a plan view of the battery pack assembly, and (c) in FIG. 6 is a cross-sectional view taken along line BB in (b) in FIG.

[0030] FIG. 7 shows a rotation prevention structure based on interference between a cap and a cover according to one embodiment of the present invention.

[0031] 3 to 7, a battery pack assembly according to one embodiment of the present invention may include a seat 10, first grooves 11 and 12, a seat internal space 13, a battery pack 20, a connector 21, a battery pack cover 22, first locking steps 23, 24, 25, and 26, a handle mounting member 27, a first accommodating portion 28, a second accommodating portion 29, second locking steps 29a and 29b, a first elastic member 30, a second elastic member 31, a handle 40, a handle body 40a, a second groove 41, a hole 42, a vertical member 43, a support member 44, a third groove 45, a cap 50, an upper member 51, an edge member 52, a leg member 53, and a protruding member 54.

[0032] The seat 10 can be mounted on an electric vehicle, such as a light electric vehicle (LEV). The seat 10 has an interior space 13 for accommodating a battery pack 20. The interior space 13 can have a shape, such as a hexahedron, corresponding to the battery pack 20 and a size (volume) corresponding to the battery pack 20.

[0033] First grooves 11, 12 are formed in the upper part of the inner side surface of the sheet 10, into which both side ends of the handle 40 can be inserted and fixed in a locked position, and the first grooves 11, 12 can have a thickness corresponding to that of the handle 40. A total of two first grooves 11, 12 can be formed, one on each of the opposing inner side surfaces of the sheet 10, and can be formed to extend laterally outward from the inner side surface. The positions of the first grooves 11, 12, particularly their positions in the height direction, can be appropriately set so that the first elastic member 30 can compress and expand (restore) only within the elastic region.

[0034] The first grooves 11, 12 may be formed continuously in the circumferential direction of the seat 10 along the rotational direction of the handle 40 over at least the rotation range of the handle 40 (from the unlocked position to the locked position). Specifically, the first grooves 11, 12 are formed starting just past the unlocked position of the handle 40 and extending to the locked position of the handle 40, but the width (lateral direction) of the first grooves 11, 12 may gradually increase along the circumferential direction of the seat 10, reaching a maximum width when the handle 40 is in the locked position.

[0035] The battery pack 20 may have a shape such as a polyhedron such as the hexahedron illustrated in the drawings or an elliptical cylinder, and may have a number of batteries built in therein. A connector 21 may be installed at the bottom of the battery pack 20, and a battery pack cover 22 may be provided at the top.

[0036] The handle 40 may be rotatably installed on the top surface of the battery pack cover 22. Here, the top surface may be interpreted as including all surfaces visible when the battery pack cover 22 is viewed from above. Specifically, it may be interpreted as including all of the top surfaces of the protruding portions that form the first locking steps 23, 24, 25, and 26, the top surface of the rotation area that contacts the handle 40, and the top surface of the circular groove that is recessed at a certain radius from the center of the battery pack cover 22.

[0037] The top surface of the battery pack cover 22 may be preferably formed in a quadrilateral shape (such as a regular square, rectangle, or diamond) as shown in the figure when viewed from above, but the shape of the top surface of the battery pack cover 22 is not particularly limited as long as both side ends of the handle 40 are positioned within the top surface range of the battery pack cover 22 in the unlocked position and both side ends of the handle 40 can protrude beyond the top surface range of the battery pack cover 22 in the locked position, and for example, a polygonal or elliptical shape is also possible, although a circular shape cannot be adopted because both side ends of the handle 40 cannot protrude beyond the top surface range.

[0038] In this specification, the upper surface area of ​​the battery pack cover 22 refers to the inside of the battery pack cover 22 when viewed from above. That is, when both ends of the handle 40 are located within the upper surface area of ​​the battery pack cover 22 in the unlocked position, this means that both ends of the handle 40 are located inside the battery pack cover 22 when viewed from above in the unlocked position. Furthermore, when both ends of the handle 40 protrude outside the upper surface area of ​​the battery pack cover 22 in the locked position, this means that both ends of the handle 40 are located outside the battery pack cover 22 when viewed from above in the locked position.

[0039] A plurality of first locking steps 23, 24, 25, 26 may be formed on the top surface of the battery pack cover 22 to restrict the rotation range of the handle 40 in the unlocked position and the locked position of the handle 40. One pair of the locking steps 23, 24 can restrain the handle 40 in the locked position, and the other pair of the locking steps 25, 26 can restrain the handle 40 in the unlocked position.

[0040] The first locking steps 23, 24, 25, and 26 may be formed by forming protruding portions by protruding upward from portions of the top surface of the battery pack cover 22. As illustrated in the drawings, the protruding portions may be formed in two pieces over a wide area on both opposing corners, or in four pieces over a narrow area.

[0041] Also, as illustrated in the drawings, a circular groove recessed at a certain radius from the center of the battery pack cover 22 may be formed on the upper surface of the battery pack cover 22. The circular groove may facilitate operation of the handle 40 and allow the handle 40 to rotate smoothly.

[0042] The area other than the protruding portion and the circular groove may be a rotation area where the handle 40 rotates while contacting the battery pack cover 22. In terms of height, the protruding portion is at the highest position, the rotation area is at an intermediate height, and the circular groove is at the lowest position. However, the configuration of the protruding portion, the circular groove, and the rotation area is not limited thereto and can be appropriately changed as needed.

[0043] The first elastic member 30 may be installed between the inner bottom surface of the seat 10 and the underside of the battery pack 20, and may be fixed to at least one or both of the seat 10 and the battery pack 20, or may be installed without being fixed. In one embodiment of the present invention, a pack fixing method is adopted that utilizes the compressive force of the first elastic member 30. The elastic modulus and deformation amount of the first elastic member 30 may be appropriately set so that the first elastic member 30 can be compressed and expanded (restored) only within its elastic region.

[0044] The handle 40 is rotatably installed on the upper surface of the battery pack cover 22 and may be rod-shaped (circular, oval, polygonal, etc. in cross section) and can rotate between an unlocked position where both ends are positioned within the upper surface range of the battery pack cover 22 and a locked position where both ends protrude (pop out) beyond the upper surface range of the battery pack cover 22.

[0045] The rotation angle of handle 40 may be, for example, 10 to 90 degrees, preferably 20 to 70 degrees, more preferably 30 to 60 degrees, and most preferably 45±5 degrees. The length of the protruding portion of handle 40 that extends beyond the upper surface of battery pack cover 22 may be, for example, 5 to 40%, preferably 10 to 30%, and more preferably 15 to 25% of the overall length of handle 40.

[0046] The rotation center of the handle 40 may be the center of the battery pack cover 22. As illustrated in the drawings, if the battery pack cover 22 is rectangular, the unlocked position of the handle 40 may be located on a diagonal of the rectangle, and the locked position of the handle 40 may be located on the perpendicular bisector of two opposing sides of the rectangle.

[0047] Looking at the process of fixing (locking) the battery pack 20 in detail, when the handle 40 is pushed down while it is in the unlocked position, the first elastic member 30 is compressed as the battery pack 20 descends, causing the handle 40 to descend. When the handle 40 is rotated to the locked position after it has descended to the position of the first grooves 11 and 12 of the seat 10, both ends of the handle 40 are inserted into the first grooves 11 and 12 of the seat 10, and the battery pack 20 can be fixed to the seat 10.

[0048] Looking in detail at the process of releasing (unlocking, opening, loosening) the battery pack 20, when both ends of the handle 40 are inserted into the first grooves 11 and 12 of the seat 10 and the handle 40 is rotated to the unlock position, the both ends of the handle 40 come out of the first grooves 11 and 12 of the seat 10, and the battery pack 20 rises due to the restoring force of the first elastic member 30, allowing it to be separated from the seat 10.

[0049] 5 and 6, a battery pack assembly according to one embodiment of the present invention may further include a cap 50 installed at the rotation center of the handle 40 to prevent rotation of the handle 40, and a second elastic member 31 installed between the handle 40 and the cap 50.

[0050] The second elastic member 31 may be disposed between the handle 40 and the cap 50, and may be fixed to at least one or both of the handle 40 and the cap 50, or may be disposed without being fixed thereto.

[0051] Cap 50 is an abbreviation for the whole

[0052]

number

[0053] Specifically, it can include an upper member 51, an edge member 52 extending downward from an edge portion of the upper member 51, a pair of leg members 53 extending downward from the upper member 51 inside the edge member 52, and a protruding member 54 extending laterally outward from a lower portion of the leg member 53.

[0054] The upper member 51 may be formed of a disk or the like. The edge members 52 may be formed on the entire edge portion of the upper member 51 or only a portion thereof, and may extend downward relatively shorter than the leg members 53. The leg members 53 may extend downward relatively longer than the edge members 52, and may be formed in pairs symmetrically with respect to the center of rotation and spaced a certain distance apart from the center of rotation. The protruding members 54 may extend short distances from the lower portions of the leg members 53 laterally outward.

[0055] Referring to Figure 7, in order to prevent rotation of the handle 40, the movement of at least the protruding member 54 must be interfered with by the handle mounting member 27 of the battery pack cover 22, and for this reason, the leg member 53 and the protruding member 54 must be formed only partially along the circumferential direction of the cap 50 in the direction of rotation of the handle 40.

[0056] The handle 40 may include a second groove 41 into which the edge member 52 of the cap 50 is inserted, a hole 42 into which the leg member 53 of the cap 50 is inserted, a vertical member 43 inserted between the pair of leg members 53 of the cap 50, a support member 44 extending laterally outward from the lower part of the vertical member 43, and a third groove 45 formed in the support member 44 into which the protruding member 54 of the cap 50 is inserted.

[0057] The second groove 41 may be formed vertically downward from the upper side of the handle body 40a, and may have a position, shape, and size corresponding to the edge member 52, and may be formed longer than the edge member 52.

[0058] The hole 42 may be formed inside the second groove 41, penetrating the handle body 40a vertically from top to bottom, so that the leg member 53 and the protruding member 54 can penetrate and reach the support member 44. The hole 42 may have a position, shape, and size corresponding to the leg member 53 and the protruding member 54.

[0059] The vertical member 43 connects the handle body 40a and the support member 44, and serves to fix the leg members 53, and also serves as a rotation axis. The vertical member 43 has the same width as the distance between the pair of leg members 53, so that the pair of leg members 53 can be inserted snugly into the vertical member 43.

[0060] The support member 44 mounts the handle 40 to the handle mounting member 27 of the battery pack cover 22, and serves to support substantially the entire handle 40 and also serves as a rotation axis. The support member 44 may have a width wider than the vertical member 43 within the width range of the handle mounting member 27.

[0061] The third groove 45 may be formed on the upper side of the support member 44 and may have a position, shape, and size corresponding to the pair of protruding members 54 .

[0062] The battery pack cover 22 may include a handle mounting member 27 that is installed at the rotation center of the handle 40. The handle mounting member 27 may include a first receiving portion 28 that receives the support member 44 of the handle 40, a second receiving portion 29 that receives the vertical member 43 of the handle 40 and the leg member 53 of the cap 50, and second locking steps 29a and 29b that are installed in the second receiving portion 29 and limit the rotation of the protruding member 54 of the cap 50.

[0063] The handle mounting member 27 serves to rotatably support the handle 40, and may be formed to protrude from the upper surface of the battery pack cover 22 at the rotation center of the handle 40, and may be formed in a cylindrical shape.

[0064] The first receiving portion 28 is a space of a relatively large volume that receives the support member 44 of the handle 40. The second receiving portion 29 is a space of a relatively large volume that is open upward and receives the vertical member 43 of the handle 40 and the leg members 53 and protruding members 54 of the cap 50, and has a width smaller than that of the first receiving portion 28. The second receiving portion 29 may be formed continuously in the circumferential direction of the handle mounting member 27 along the rotational direction of the handle 40, at least over the rotational range of the handle 40.

[0065] The second locking steps 29a, 29b may be installed in the second receiving portion 29, for example, directly above the third groove 45 of the handle 40, and may be configured with a total of two pairs, one pair for each protruding member 54, as illustrated in Fig. 7. However, the positions, number, shape, size, etc. of the second locking steps 29a, 29b may be appropriately changed as needed.

[0066] 5 and 7 show the structure for preventing rotation by interference between cap 50 and battery pack cover 22. When handle 40 is in the unlocked position, protruding member 54 of cap 50 is locked into second locking steps 29a, 29b of handle mounting member 27 of battery pack cover 22, preventing rotation of handle 40. When cap 50 is not pressed, it is always in this interference state.

[0067] Referring to Figure 6, when the handle 40 is in the unlocked position and the cap 50 is pushed down, the second elastic member 31 is compressed and the protruding member 54 of the cap 50 moves downward, disengaging from the second locking steps 29a, 29b and being inserted into the third groove 45 of the handle 40, thereby allowing the handle 40 to rotate.

[0068] In this way, when the cap 50 is pressed, the handle 40 can be rotated. Specifically, when the cap 50 is pressed, the battery pack 20 is also pressed, and the handle 40 can be rotated at the same time.

[0069] After the battery pack 20 is fixed in the first grooves 11 and 12 of the sheet 10, if the pressed cap 50 is released, the cap 50 will rise due to the restoring force of the second elastic member 31 and return to the state shown in FIG. 5.

[0070] As described above, the fixing structure according to one embodiment of the present invention has as essential components the rotating handle, the elastic member on the bottom of the seat, and the groove inside the seat into which the rotating handle can be inserted, and optionally a cap structure can be applied to prevent the handle from rotating when the battery pack is detached.

[0071] One embodiment of the present invention employs a pack fixing method that utilizes the compressive force within the elastic region of the elastic member on the bottom of the seat. Specifically, a structure is employed in which a rotatable handle of the battery pack is inserted into a groove at the upper end of the seat to compress the elastic member at the lower end of the seat, thereby fixing the battery pack. By utilizing the compressive force within the elastic region of the elastic member, the battery pack can be fixed at a constant level even when used for long periods of time, and damage to the pack due to poor connector contact and vibration / impact can be prevented.

[0072] In addition, in one embodiment of the present invention, the elastic modulus and deformation amount are taken into consideration so that the elastic member at the lower end of the seat can compress / expand only within the elastic region, so that the compressive force that secures the battery pack can be maintained even during long-term repeated use. [Industrial Applicability]

[0073] The battery pack assembly of the present invention uses a pack fixing method that utilizes the compressive force of an elastic member, and can maintain the fixing force of the battery pack even during repeated use over a long period of time. [Explanation of symbols]

[0074] 10 sheets 20 Battery Pack 22 Battery pack cover 30 First elastic member 40 Handle

Claims

1. a battery pack having a battery pack cover; a handle rotatably installed around the center of the battery pack cover, the handle rotating between an unlocked position where both end portions of the handle are located on the outer periphery of the battery pack cover or closer to the center than the outer periphery, which is the inside of the battery pack cover, and a locked position where both end portions of the handle protrude outward beyond the outer periphery of the battery pack cover; a seat having an internal space for accommodating the battery pack, the seat being configured to receive both side ends of the handle at a lock position, and having grooves into which the both side ends of the handle are inserted at the lock position; an elastic member provided in an internal space of the seat and arranged to be compressed when the battery pack is inserted into the internal space; a battery pack assembly.

2. When the handle is in the unlocked position and the handle is pushed down, the battery pack descends, compressing the elastic member and causing the handle to descend.

2. The battery pack assembly according to claim 1, wherein when the handle is rotated to a lock position with the handle lowered to a groove position in the seat, both end portions of the handle are inserted into the grooves in the seat, and the battery pack is fixed to the seat.

3. 3. The battery pack assembly according to claim 2, wherein when the handle is rotated to an unlocked position with both end portions of the handle inserted into the grooves of the seat, the both end portions of the handle are released from the grooves of the seat, and the battery pack is lifted and separated from the seat by the restoring force of the elastic members.

4. 2. The battery pack assembly according to claim 1, wherein the groove positions of the sheet and the elastic modulus and deformation amount of the elastic member are set so that the elastic member can compress and expand only within an elastic region.

5. The battery pack assembly according to claim 1 , wherein the battery pack cover is formed with a locking step that limits the rotation range of the handle when the handle is in the unlocked position and the locked position.

6. 2. The battery pack assembly according to claim 1, wherein the groove in the seat is formed continuously in the circumferential direction of the seat along the rotation direction of the handle at least over the rotation range of the handle.

7. a cap that is installed at the rotation center of the handle and can prevent the handle from rotating; a second elastic member disposed between the handle and the cap; The battery pack assembly of claim 1 , further comprising:

8. The cap includes an upper member and an edge member extending downward from an edge portion of the upper member; a pair of leg members extending downward from the upper member on the inner side of the edge member; a protruding member extending laterally outward from a lower portion of the leg member; 8. The battery pack assembly of claim 7, comprising:

9. The handle is a second groove into which the edge member of the cap is inserted; a hole into which the leg member of the cap is inserted; a vertical member inserted between the pair of leg members of the cap; a support member extending laterally outward from a lower portion of the vertical member; a third groove formed in the support member and into which the protruding member of the cap is inserted; 9. The battery pack assembly of claim 8, comprising:

10. The battery pack cover includes a handle mounting member installed at a rotation center of the handle, The handle attachment member has a first receiving portion that receives a support member of the handle; a second receiving portion for receiving the vertical member of the handle and the leg member of the cap; a second locking step disposed in the second receiving portion and configured to limit rotation of the protruding member of the cap; 10. The battery pack assembly of claim 9, comprising:

11. 11. The battery pack assembly according to claim 10, wherein when the handle is in the unlocked position, the protruding member of the cap is locked to the second locking step to prevent the handle from rotating.

12. 11. The battery pack assembly of claim 10, wherein when the cap is pushed downward with the handle in the unlocked position, the second elastic member is compressed, causing the protruding member of the cap to escape from the second locking step and be inserted into the third groove of the handle, thereby allowing the handle to rotate.

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