Battery pack structure for electric trolley and electric trolley

Abstract

The utility model discloses a battery pack structure for an electric trolley and the electric trolley, and the battery pack structure comprises a shell, at least one fixed connecting piece and at least one movable connecting piece, the fixed connecting piece and the movable connecting piece respectively comprise a shell connecting end connected with the shell and a frame connecting end connected with a frame of the electric trolley, the shell connecting end of the fixed connecting piece is fixedly connected with the shell, and the shell connecting end of the movable connecting piece is movably connected with the shell; the movable connecting piece can slide on the shell to be close to or far away from the fixed connecting piece so as to adapt to the distance between mounting point positions under different folding degrees of the frame, so that when the battery pack structure is arranged on the frame, the fixed connecting piece and the movable connecting piece cannot prevent the frame from being folded together, the occupied space after the electric trolley is folded is further reduced, and the electric trolley is more convenient to use. The storage is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of electric trolleys, and in particular to a battery pack structure for an electric trolley and an electric trolley. Background Art

[0002] A trolley is a transport tool that is pushed and pulled by manpower. It is widely used in various places in life because of its low cost, simple maintenance, easy operation, light weight, and ability to work in places where motor vehicles are inconvenient to use, to transport items within a short distance. As people's needs further increase, some trolleys are equipped with battery packs and drive motors as power sources, which leads to the development of electric trolleys. When using an electric trolley for transportation, users can use the drive motor to drive the trolley, which provides users with a certain amount of assistance and reduces physical exertion during transportation.

[0003] In order to facilitate storage and reduce floor space, the frames of existing trolleys are basically foldable. According to different folding methods, they can be divided into opposite folding frames and four-way gathering frames. When the opposite folding frame is folded, only the side wall assembly of the frame is folded. When the four-way gathering frame is folded, the front wall assembly, rear wall assembly and side wall assembly of the frame are all folded. Therefore, the four-way gathering frame has a larger folding range than the opposite folding frame and occupies a smaller floor space after folding. The battery pack structure of the existing electric trolley is arranged on the front wall assembly or the rear wall assembly, so that the front wall assembly or the rear wall assembly cannot be folded, which results in that the existing electric trolley can only use the opposite folding frame, and cannot use the four-way gathering frame. After the electric trolley is folded and stored, the volume is still large and needs to occupy a large space. Summary of the invention

[0004] One object of the present application is to provide a battery pack structure for an electric trolley, so that after the battery pack structure is installed on the frame, it will not restrict the gathering and folding of the frame, thereby further reducing the space occupied by the electric trolley after being stored and folded.

[0005] Another object of the present application is to provide an electric trolley.

[0006] To achieve the above objectives, the technical solution adopted in the present application is: a battery pack structure for an electric trolley, comprising a shell, at least one fixed connector and at least one movable connector, the fixed connector and the movable connector each comprising a shell connecting end connected to the shell and a frame connecting end connected to the frame of the electric trolley, the shell connecting end of the fixed connector is fixedly connected to the shell, and the shell connecting end of the movable connector is movably connected to the shell.

[0007] Preferably, a fixed connecting member and a movable connecting member are arranged on the connecting end surface of the shell, and a sliding guide groove is arranged on the connecting end surface of the shell, the shell connecting end of the fixed connecting member is fixedly arranged on the connecting end surface of the shell, and the shell connecting end of the movable connecting member is slidably arranged in the sliding guide groove, so that the movable connecting member can slide along the sliding guide groove towards or away from the fixed connecting member.

[0008] As another preference, the fixed connector and the sliding guide groove are arranged along the same axis, and the distance between the fixed connector and the end of one side of the sliding guide groove close to the fixed connector is between 20 mm and 30 mm.

[0009] Further preferably, the length of the sliding guide groove is between 100 mm and 140 mm.

[0010] Furthermore, at least one side end portion of the sliding guide groove is provided with an opening for the movable connecting member to slide in or out.

[0011] Furthermore, the sliding guide groove is a T-shaped groove, and the sliding guide groove includes a transverse channel and a vertical channel. The vertical channel is connected to the middle of the transverse channel. The transverse channel is arranged parallel to the connecting end surface of the shell, and the vertical channel is arranged perpendicular to the connecting end surface of the shell. The shell connecting end of the movable connecting member can be slidably arranged in the transverse channel.

[0012] Furthermore, the fixed connecting member includes a first bolt and a first nut, a through hole is provided on the connecting end surface of the shell, the head of the first bolt is provided inside the shell, the screw rod of the first bolt extends through the through hole to the outside of the shell and is connected to the frame, and then the hinge connection between the battery pack structure and the frame is realized through the cooperation of the first bolt and the first nut.

[0013] Furthermore, the movable connecting part includes a second bolt and a second nut, the head of the second bolt can be slidably arranged in the transverse channel, and the screw rod of the second bolt extends through the vertical channel to the outside of the sliding guide groove and is connected to the frame, and then the hinge connection between the battery pack structure and the electric vehicle frame is realized through the cooperation of the second bolt and the second nut.

[0014] Furthermore, anti-wear washers are arranged between the first bolt, the second bolt and the electric trolley frame.

[0015] An electric trolley comprises a frame and the above-mentioned battery pack structure.

[0016] Compared with the prior art, the beneficial effects of this application are:

[0017] (1) The present application relates to a battery pack structure for an electric trolley, comprising a fixed connector and a movable connector for connecting to a frame of the electric trolley, wherein the movable connector can slide on a housing to move closer to or away from the fixed connector to adapt to the spacing of mounting points at different folding degrees of the frame, so that when the battery pack structure is set on the frame, the fixed connector and the movable connector will not hinder the frame from being folded or unfolded;

[0018] (2) The battery pack structure is connected to the vehicle frame through fixed connectors and movable connectors. There are two connection points between the battery pack structure and the vehicle frame. The two connection points are arranged up and down to improve the stability of the battery pack structure connection, limit the swing of the battery pack, and prevent the battery pack structure from falling off the vehicle frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the battery pack in this application;

[0020] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0021] Figure 3 It is a schematic diagram of the structure of the electric trolley in this application;

[0022] Figure 4 It is a structural schematic diagram of the rear wall assembly in this application.

[0023] In the figure: 100, frame; 110, front bracket; 111, driven wheel; 120, rear bracket; 121, driving wheel; 130, front wall assembly; 140, rear wall assembly; 150, side wall assembly; 160, folding component; 161, first frame tube; 162, second frame tube; 170, first hinge hole; 180, second hinge hole; 200, battery pack structure; 300, shell; 310, sliding guide groove; 311, transverse channel; 312, vertical channel; 320, opening; 400, fixed connector; 410, first bolt; 420, first nut; 500, movable connector; 510, second bolt; 520, second nut; 600, anti-wear washer. DETAILED DESCRIPTION

[0024] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0025] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0026] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0027] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0028] like Figure 1-2As shown, the present application provides a battery pack structure 200 for an electric trolley, which is suitable for being arranged on the frame 100 of the electric trolley to supply power to the driving wheel 121 of the electric trolley, thereby providing assistance to the user and reducing physical exertion. The battery pack structure 200 includes a shell 300, a fixed connector 400 and a movable connector 500. The fixed connector 400 and the movable connector 500 each include a shell connecting end connected to the shell 300 and a frame connecting end connected to the frame 100 of the electric trolley. The shell connecting end of the fixed connector 400 is fixedly disposed on the connecting end surface of the shell 300. The frame connecting end of the fixed connector 400 is connected to a first mounting point on the frame 100. The shell connecting end of the movable connector 500 is movably disposed on the connecting end surface of the shell 300. The movable connector The frame connection end of 500 is connected to the second mounting point on the frame 100, and then the movable connecting member 500 can slide on the shell 300 according to the folding state of the frame 100 to adjust the relative position of the fixed connecting member 400 and the movable connecting member 500, so as to adapt to the relative position of the first mounting point and the second mounting point of the frame 100 in different folding states. That is, when the frame 100 is folded and the position of the second mounting point changes, the movable connecting member 500 can move with the second mounting point, and will not limit the movement of the second mounting point and cause the frame 100 to be unable to fold. The battery pack structure 200 is usually arranged on the rear wall assembly 140 or the front wall assembly 130 of the frame 100, and then the battery pack structure 200 provided in the present application enables the rear wall assembly 140 or the front wall assembly 130 of the frame 100 to also adopt a folding structure, that is, the electric trolley can adopt a four-way gathering frame, so that the folded frame 100 is smaller in size and occupies less space.

[0029] The battery pack structure 200 may be provided with different numbers of fixed connectors 400 and movable connectors 500 according to different structures of the vehicle frame 100 .

[0030] Furthermore, a sliding guide groove 310 is provided on the connecting end face of the shell 300, and an opening 320 for the movable connecting member 500 to slide in or out is provided on at least one side end of the sliding guide groove 310. The shell connecting end of the movable connecting member 500 is slidably arranged in the sliding guide groove 310, and the shell connecting end of the movable connecting member 500 can slide along the sliding guide groove 310 to realize the sliding connection between the movable connecting member 500 and the connecting end face of the shell 300.

[0031] In some preferred embodiments, the sliding guide groove 310 is a T-shaped groove, and the sliding guide groove 310 includes a transverse channel 311 and a vertical channel 312. The vertical channel 312 is connected to the middle of the transverse channel 311. The transverse channel 311 is arranged parallel to the connecting end surface of the shell 300, and the vertical channel 312 is arranged perpendicular to the connecting end surface of the shell 300. The fixed connector 400 includes a first bolt 410 and a first nut 420, and the movable connector 500 includes a second bolt 510 and a second nut 520. A through hole is provided on the connecting end surface of the shell 300. The head of the first bolt 410 is provided inside the shell 300, and the screw rod of the first bolt 410 extends through the through hole to the outside of the shell 300 to be connected to the frame 100, and the connection between the fixed connector 400 and the frame 100 is realized by the cooperation between the first bolt 410 and the first nut 420; the head of the second bolt 510 is slidably provided in the transverse channel 311, and the screw rod of the second bolt 510 extends through the vertical channel 312 to the outside of the sliding guide groove 310 to be connected to the frame 100, and the connection between the movable connector 500 and the frame 100 is realized by the cooperation between the second bolt 510 and the second nut 520, so that the articulation of the battery pack structure 200 and the frame 100 is realized through the fixed connector 400 and the movable connector 500.

[0032] The battery pack structure 200 is connected to the frame 100 through the fixed connector 400 and the movable connector 500, so that there are two connection points between the battery pack structure 200 and the frame 100. The two connection points are arranged up and down to improve the stability of the connection of the battery pack structure 200 and limit the swing of the battery pack structure 200. In addition, since the first installation point and the second installation point of the frame 100 may not always be arranged vertically when they are close to or away from each other during the folding process, the battery pack structure 200 is hinged to the frame 100 through the fixed connector 400 and the movable connector 500 to accommodate the deviation of the first installation point and the second installation point during the folding of the frame 100, and avoid the phenomenon of jamming during the folding of the frame 100. Preferably, the size of the transverse channel 311 is compatible with the size of the head of the second bolt 510, and the size of the vertical channel 312 is compatible with the size of the screw of the second bolt 510, so that the second bolt 510 will not have unnecessary shaking when sliding in the sliding guide groove 310, thereby improving the stability of the connection of the battery pack structure 200.

[0033] Furthermore, the fixed connector 400 and the sliding guide groove 310 are arranged along the same axis, the distance from the end of the sliding guide groove 310 close to the fixed connector 400 to the fixed connector 400 is between 20mm-30mm, the distance from the end of the sliding guide groove 310 far from the fixed connector 400 to the fixed connector 400 is between 120mm-170mm, and the length of the sliding guide groove 310 is between 100mm-140mm. Since the end of the sliding guide groove 310 is provided with an opening 320 for the movable connector 500 to slide in and out, if the distance from the two ends of the sliding guide groove 310 to the fixed connector 400 is too close or too far, the movable connector 500 will slide out of the opening 320 at the end of the sliding guide groove 310 when the frame 100 of the electric trolley is folded, and the distance between the fixed connector 400 and the two ends of the sliding guide groove 310 needs to be determined according to the specific structural dimensions of the frame 100.

[0034] An anti-wear washer 600 is also provided between the battery pack structure 200 and the frame 100. The anti-wear washer 600 is suitable for preventing the housing 300 of the battery pack structure 200 from contacting the frame 100, thereby preventing the housing 300 of the battery pack structure 200 and the frame 100 from being worn after being folded or unfolded for a long time. Specifically, the anti-wear washer 600 is provided on the screws of the first bolt 410 and the second bolt 510. When the battery pack structure 200 is installed on the frame 100 through the first bolt 410 and the second bolt 510, the anti-wear washer 600 is located between the frame steel pipe and the housing 300 of the battery pack structure 200, which can effectively prevent wear.

[0035] like Figure 3-4 As shown, the present application further provides an electric trolley, comprising a frame 100 and a battery pack structure 200 disposed on the frame 100 .

[0036] The frame 100 of the electric trolley specifically includes two front brackets 110, two rear brackets 120, a front wall assembly 130 arranged between the two front brackets 110, a rear wall assembly 140 arranged between the two rear brackets 120, and two side wall assemblies 150 arranged between the front brackets 110 and the rear brackets 120. Driven wheels 111 are arranged at the bottom of the two front brackets 110, and driving wheels 121 are arranged at the bottom of the two rear brackets 120. The battery pack structure 200 is arranged on the rear wall assembly 140 of the frame 100. When the user pushes or pulls the electric trolley through the pull rod, the battery pack structure 200 can supply power to the driving wheel 121, so that the driving wheel 121 works to provide assistance to the user, thereby reducing the user's physical exertion.

[0037] The front wall assembly 130, the rear wall assembly 140 and the two side wall assemblies 150 can all be folded, so that after the frame 100 is folded, the two front brackets 110 and the two rear brackets 120 are gathered together. In other words, the frame 100 of the electric trolley is a four-way gathering frame.

[0038] Among them, the rear wall assembly 140 is a folding linkage mechanism, which includes two mutually hinged folding components 160. The folding component 160 is an X-shaped structure formed by cross-riveting a first frame tube 161 and a second frame tube 162. One end of the first frame tube 161 in the folding component 160 is hinged to one end of the second frame tube 162 in another adjacent folding component 160, and the other end of the first frame tube 161 is hinged to the rear bracket 120. One end of the second frame tube 162 in the folding component 160 is hinged to one end of the first frame tube 161 in another adjacent folding component 160, and the other end of the second frame tube 162 is hinged to the rear bracket 120. Then, the two folding components 160 are hinged to each other to form a first hinge hole 170 and a second hinge hole 180. The first hinge hole 170 and the second hinge hole 180 are used to connect with the battery pack structure 200.

[0039] The front wall assembly 130 and the side wall assembly 150 are also folding linkage mechanisms. The front wall assembly 130 includes two mutually hinged folding assemblies 160, and the side wall assembly 150 includes three mutually hinged folding assemblies 160. The front wall assembly 130, the rear wall assembly 140 and the two side wall assemblies 150 form a rectangular frame structure connected end to end through two front brackets 110 and two rear brackets 120. A loading space for placing transported items is formed in the rectangular frame structure. It is worth mentioning that the number of folding assemblies 160 included in the front wall assembly 130, the rear wall assembly 140 and the side wall assembly 150 is not fixed, and the number of folding assemblies 160 can be changed according to the capacity to be achieved by the loading space of the electric trolley.

[0040] The frame connection end of the fixed connector 400 is hinged to the first hinge hole 170, and the frame connection end of the movable connector 500 is hinged to the second hinge hole 180. Since the movable connector 500 can move on the shell 300 of the battery pack structure 200, the fixed connector 400 and the movable connector 500 will not restrict the rotation of the first frame tube 161 and the second frame tube 162 on the rear wall assembly 140 to hinder the folding component 160 from folding or unfolding. That is, when the battery pack structure 200 is installed on the rear wall assembly 140, the rear wall assembly 140 can still be folded for storage or unfolded for use.

[0041] Specifically, when the folding component 160 is folded or unfolded, the first frame tube 161 and the second frame tube 162 will rotate, causing the first hinge hole 170 and the second hinge hole 180 formed by the two folding components 160 being hinged to each other to move relative to each other, causing the distance between the two to increase or decrease, and the movable connecting member 500 hinged to the second hinge hole 180 can move together with the second hinge hole 180, and the movable connecting member 500 slides away from or close to the fixed connecting member 400 in the sliding guide groove 310 to make the distance between the fixed connecting member 400 and the movable connecting member 500 adapt to the distance between the first hinge hole 170 and the second hinge hole 180, that is, while keeping the fixed connecting member 400, the movable connecting member 500 connected to the rear wall assembly 140, the rear wall assembly 140 can be folded or unfolded.

[0042] In addition, in the existing electric trolley, the rear wall assembly 140 or the front wall assembly 130 provided with the battery pack structure 200 is a non-foldable structure, and when the electric trolley is subjected to a lateral external force, it is easy to cause the first frame tube 161 and the second frame tube 162 in the rear wall assembly 140 and the front wall assembly 130 to be bent and damaged, and the hinge between the first frame tube 161 and the second frame tube 162 to be damaged. The front wall assembly 130 and the rear wall assembly 140 in the present application can be folded, and when the electric trolley is subjected to a lateral external force, the front wall assembly 130 and the rear wall assembly 140 can be folded in time to absorb energy, thereby preventing the first frame tube 161 and the second frame tube 162 from being damaged.

[0043] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A battery pack structure for an electric trolley, characterized in that: It includes a shell, at least one fixed connecting member and at least one movable connecting member, wherein the fixed connecting member and the movable connecting member each include a shell connecting end connected to the shell and a frame connecting end connected to the electric trolley frame, the shell connecting end of the fixed connecting member is fixedly connected to the shell, and the shell connecting end of the movable connecting member is movably connected to the shell.

2. The battery pack structure according to claim 1, characterized in that: A fixed connection member and a movable connection member are arranged on the connecting end surface of the shell, and a sliding guide groove is arranged on the connecting end surface of the shell. The shell connecting end of the fixed connection member is fixedly arranged on the connecting end surface of the shell, and the shell connecting end of the movable connection member is slidably arranged in the sliding guide groove, so that the movable connection member can slide along the sliding guide groove towards or away from the fixed connection member.

3. The battery pack structure according to claim 2, characterized in that: The fixed connection piece and the sliding guide groove are arranged along the same axis, and the distance between the fixed connection piece and the end portion of the sliding guide groove close to one side of the fixed connection piece is between 20 mm and 30 mm.

4. The battery pack structure according to claim 3, characterized in that: The length of the sliding guide groove is between 100 mm and 140 mm.

5. The battery pack structure according to claim 2, characterized in that: At least one end portion of the sliding guide groove is provided with an opening for the movable connecting member to slide in or out.

6. The battery pack structure according to any one of claims 2 to 5, characterized in that: The sliding guide groove is a T-shaped groove, and the sliding guide groove includes a transverse channel and a vertical channel. The vertical channel is connected to the middle of the transverse channel. The transverse channel is arranged parallel to the connecting end surface of the shell, and the vertical channel is arranged perpendicular to the connecting end surface of the shell. The shell connecting end of the movable connecting member can be slidably arranged in the transverse channel.

7. The battery pack structure according to claim 6, characterized in that: The fixed connecting member includes a first bolt and a first nut. A through hole is provided on the connecting end surface of the shell. The head of the first bolt is provided inside the shell. The screw rod of the first bolt extends through the through hole to the outside of the shell and is connected to the frame. Then, the hinge connection between the battery pack structure and the frame is realized through the cooperation between the first bolt and the first nut.

8. The battery pack structure according to claim 6, characterized in that: The movable connecting part includes a second bolt and a second nut. The head of the second bolt can be slidably arranged in the transverse channel. The screw rod of the second bolt extends through the vertical channel to the outside of the sliding guide groove and is connected to the frame. Then, through the cooperation of the second bolt and the second nut, the hinge connection between the battery pack structure and the electric vehicle frame is realized.

9. The battery pack structure according to claim 8, characterized in that: Anti-wear washers are arranged between the fixed connecting piece, the movable connecting piece and the electric trolley frame.

10. An electric trolley, characterized in that: It comprises a vehicle frame and a battery pack structure as described in any one of claims 1 to 9.

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