Battery waterproof structure, power battery and electric bicycle

Abstract

The utility model relates to a battery waterproof structure, a power battery and an electric bicycle. Relates to the technical field of new energy batteries. The box body is internally provided with a cavity, the box cover covers the box body, the sealing piece is arranged between the box cover and the box body, and the box cover and the box body are connected through the connecting piece. The top of the cavity is open and is used for loading a battery module, the box cover is used for sealing the top opening of the cavity, the sealing element is used for sealing the box body and the box cover, and the connecting element is used for fixedly connecting the box cover and the box body in the vertical direction. According to the battery waterproof structure, the box cover and the box body are fixedly connected along the vertical direction by the connecting piece, and the gap between the box cover and the box body is sealed by the sealing piece, so that the battery waterproof structure is simple in structure and easy to implement, the waterproof performance of the power battery can be improved, the volume energy density of the power battery can be improved, and the service life of the battery is prolonged. And the cruising ability of the electric bicycle is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy batteries, in particular to a battery waterproof structure, a power battery and an electric bicycle. Background Art

[0002] With the increasing awareness of environmental protection, electric bicycles, as a zero-emission means of transportation, are becoming increasingly popular. The main power source of electric bicycles is the battery, and the performance of the battery directly affects the endurance and service life of the electric bicycle. Currently, electric bicycle batteries are usually placed under the seat or in the bottom pedal for easy replacement and maintenance. However, when the road is flooded or it rains, the battery is easily splashed or immersed in the accumulated water, which may cause the internal circuit of the battery to short-circuit and fail. In severe cases, it may even cause the battery cell to short-circuit or even catch fire, resulting in personal safety accidents. In the prior art, the sealing structure of electric bicycle batteries is relatively complex and occupies a large amount of space in the box, resulting in a low volume energy density of the battery, which affects the endurance of the electric bicycle.

[0003] Chinese patent CN115172963A, published on October 11, 2022, discloses a battery waterproof structure and an electric vehicle power battery. The battery waterproof structure includes a box body, a sealing connector, and a box cover. The box body has an opening. The sealing connector includes a frame portion, a threaded blind hole, and a flange portion. The sealing connector cooperates with the open inner side wall of the box body through the frame portion, and a sealant is provided between the frame portion and the open inner side wall. The threaded blind holes are located around the frame portion, and the flange portion is bent inward along the outer end of the frame portion. The box cover cooperates with the open outer side wall of the box body through the cover edge. The box cover passes through the cover edge, the open side wall, and the threaded blind hole to be threaded and locked. A sealing ring is installed between the box cover and the flange portion of the sealing connector. This battery waterproof structure can provide good waterproof protection for the battery. However, this battery waterproof structure is achieved by welding blind hole nuts inside the box body and then screwing them in from the side. Since the blind hole nuts occupy a lot of space inside the box, the volume energy density of the battery is low, which affects the endurance of the electric bicycle. Utility Model Content

[0004] The purpose of the present utility model is to address the deficiencies of the above-mentioned prior art and to provide a battery waterproof structure, a power battery and an electric bicycle, which have a simple structure and are easy to implement. They can not only improve the waterproof performance of the power battery, but also increase the volume energy density of the power battery, thereby extending the endurance of the electric bicycle.

[0005] The utility model proposes a battery waterproof structure, comprising a box body with a cavity therein, a box cover covering the box body, a sealing member provided between the box cover and the box body, and a connecting member connecting the box cover and the box body; the top opening of the cavity is used to load a battery module, the box cover is used to close the top opening of the cavity, the sealing member is used to seal the box body and the box cover, and the connecting member fixedly connects the box cover and the box body in a vertical direction.

[0006] Furthermore, the box body is provided with a first sealing surface, and the box cover is provided with a second sealing surface. When the connecting piece fixedly connects the box cover to the box body, the second sealing surface fits the first sealing surface.

[0007] Furthermore, a first sealing groove is provided on the first sealing surface, a second sealing groove is provided on the second sealing surface, and the sealing member is a sealing ring embedded in the first sealing groove and the second sealing groove.

[0008] Furthermore, the first sealing surface is provided with a threaded hole along the vertical direction, and the threaded hole is distributed on the inner side of the first sealing groove; the second sealing surface is provided with a through hole along the vertical direction, and the through hole is distributed on the inner side of the second sealing groove; the connecting member is a bolt with one end passing through the through hole and then being screwed to the threaded hole.

[0009] Furthermore, the battery waterproof structure also includes a connector seat provided on the box cover, and a sealing cover movably connected to the connector seat, the connector seat is provided with a charge and discharge interface for charging and discharging the battery module, and the sealing cover is used to open or close the charge and discharge interface.

[0010] Furthermore, the connector seat is provided with a plug-in slot, which is arranged on the outer periphery of the charge and discharge interface. The sealing cover is provided with a plug-in portion that plugs into the plug-in slot, and a flexible connecting belt connected to the connector seat.

[0011] Furthermore, the battery waterproof structure also includes a mounting bracket provided in the cavity, and the mounting bracket is used to fix the battery module.

[0012] Furthermore, the mounting bracket includes a top bracket for fixing the top of the battery module, and a bottom bracket for fixing the bottom of the battery module. Both the top bracket and the bottom bracket are provided with limiting grooves adapted to the outer contour of the battery module.

[0013] The present invention also provides a power battery, comprising the above-mentioned battery waterproof structure, and also comprising a plurality of battery modules installed in the cavity.

[0014] The present utility model also provides an electric bicycle, comprising the above-mentioned power battery and a vehicle body, wherein the power battery is arranged on the vehicle body.

[0015] The battery waterproof structure, power battery and electric bicycle proposed in this utility model have the following beneficial effects:

[0016] (1) The connector of the battery waterproof structure vertically connects the box cover and the box body, and the sealing member seals the gap between the box cover and the box body, thereby making the battery waterproof structure simple and easy to implement, which can not only improve the waterproof performance of the power battery, but also increase the volume energy density of the power battery, thereby extending the endurance of the electric bicycle;

[0017] (2) The first sealing surface of the battery waterproof structure is set at the top of the box body, and the second sealing surface is set at the bottom of the box cover. When the connecting piece fixes the box cover to the box body in the vertical direction, the second sealing surface at the bottom of the box cover fits with the first sealing surface at the top of the box body, so that when the box cover is closed on the box body, it forms a closed structure with the box body, thereby enhancing the sealing effect of the battery module in the cavity and improving the waterproof performance of the power battery;

[0018] (3) The connector of the battery waterproof structure vertically connects the box cover to the box body, so that when the box cover is closed on the box body, the sealing ring is simultaneously embedded in the first sealing groove and the second sealing groove. The sealing ring is limited by the first sealing groove and the second sealing groove, so that the sealing ring seals the gap between the first sealing surface and the second sealing surface, further enhancing the sealing effect of the battery module in the cavity and improving the waterproof performance of the power battery;

[0019] (4) The through holes and threaded holes of the battery waterproof structure are both arranged in the vertical direction. Therefore, after one end of the bolt passes through the through hole in the vertical direction and is screwed into the threaded hole, the space occupied by the bolt in the box can be reduced, thereby increasing the volume energy density of the power battery and extending the endurance of the electric bicycle.

[0020] (5) The threaded hole of the battery waterproof structure is arranged on the inner side of the first sealing groove, and the through hole is arranged on the inner side of the second sealing groove. Thus, after one end of the bolt passes through the through hole in the vertical direction and is screwed into the threaded hole, the sealing ring also produces a sealing effect on the bolt, thereby preventing the bolt from contacting with water, causing corrosion of the bolt, and affecting the stability of the battery waterproof structure;

[0021] (6) The battery waterproof structure also includes a connector seat provided on the box cover, and a sealing cover movably connected to the connector seat. The connector seat is provided with a charge and discharge interface for charging and discharging the battery module. The charge and discharge interface on the connector seat is closed by the sealing cover, which can prevent water or other debris from entering the cavity of the box through the charge and discharge interface, thereby further improving the waterproof performance of the power battery;

[0022] (7) The battery waterproof structure also includes a mounting bracket, which is arranged in the cavity of the box body. When the battery module is loaded in the cavity, the mounting bracket fixes the battery module, thereby preventing the battery module from shaking in the cavity of the box body, ensuring the stability of the power battery structure, and thus ensuring the service life of the power battery;

[0023] (8) The number of limit slots provided on the top bracket and the bottom bracket of the battery waterproof structure is greater than or equal to the number of battery modules in the power battery, so that the battery modules in the power battery can be increased or decreased according to actual needs, thereby increasing the scope of application of the power battery and enhancing the practicality of the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present utility model and, together with the description, serve to explain the principles of the present utility model. In the accompanying drawings, like reference numerals are used to represent like elements.

[0025] Figure 1 This is an exploded view of the installation of a battery waterproof structure, a power battery, and an electric bicycle according to an embodiment of the utility model;

[0026] Figure 2 This is a schematic structural diagram of a battery waterproof structure, a power battery, and an electric bicycle according to an embodiment of the present utility model;

[0027] Figure 3 This is a cross-sectional schematic diagram of a battery waterproof structure, a power battery, and an electric bicycle according to an embodiment of the present utility model;

[0028] Figure 4 for Figure 3 A magnified schematic diagram of point A in the middle;

[0029] Figure 5 This is a partial structural diagram of a battery waterproof structure, a power battery, and a box of an electric bicycle according to an embodiment of the present utility model;

[0030] Figure 6 This is a schematic structural diagram of a battery waterproof structure, a power battery, and a box cover of an electric bicycle according to an embodiment of the present utility model;

[0031] Figure 7 This is a structural schematic diagram of a battery waterproof structure, a power battery, and a top bracket and a bottom bracket of an electric bicycle according to an embodiment of the present utility model.

[0032] In the figure: 1. Box body; 11. Cavity; 12. First sealing surface; 13. First sealing groove; 14. Threaded hole; 2. Box cover; 21. Second sealing surface; 22. Second sealing groove; 23. Through hole; 3. Sealing ring; 4. Bolt; 5. Connector seat; 51. Charge and discharge interface; 52. Plug-in slot; 6. Sealing cover; 61. Plug-in part; 62. Flexible connecting belt; 7. Mounting bracket; 71. Top bracket; 711. Limiting groove; 72. Bottom bracket; 8. Battery module. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 7 A battery waterproof structure of an embodiment of the present invention includes a box body 1 with a cavity 11 therein, a box cover 2 covering the box body 1, a sealing member provided between the box cover 2 and the box body 1, and a connecting member connecting the box cover 2 and the box body 1; the top of the cavity 11 is open for loading the battery module 8, the box cover 2 is used to close the top opening of the cavity 11, the sealing member is used to seal the box body 1 and the box cover 2, and the connecting member fixedly connects the box cover 2 to the box body 1 in the vertical direction.

[0035] In this patent, the battery waterproof structure includes a box body 1, a box cover 2, a seal and a connector. A cavity 11 is provided in the box body 1, and the top of the cavity 11 is open, so that the battery module 8 can be loaded into the box body 1 through the opening at the top of the cavity 11. The box cover 2 and the box body 1 are connected by the connector so that the box cover 2 covers the box body 1, sealing the top opening of the cavity 11 of the box body 1, thereby forming a closed structure and sealing the battery module 8 located in the cavity 11.

[0036] Since in this patent, when the connecting member fixes the box cover 2 and the box body 1, the sealing member is located between the box cover 2 and the box body 1, and thus the gap between the box cover 2 and the box body 1 is sealed by the sealing member, the waterproof performance of the power battery can be improved; and since in this patent, when the connecting member connects the box cover 2 and the box body 1, the box cover 2 and the box body 1 are fixedly connected in the vertical direction, the connection structure of the battery waterproof structure is simpler and easier to implement, and the space occupied in the box body 1 can be reduced, thereby improving the volume energy density of the power battery and extending the endurance of the electric bicycle.

[0037] Furthermore, in this embodiment, the box body 1 and the box cover 2 can be integrally formed by injection molding, so that the closed structure formed by the box body 1 and the box cover 2 has better waterproof performance and lighter weight, thereby improving the waterproof performance of the power battery, and increasing the weight energy density of the power battery, thereby extending the endurance of the electric bicycle.

[0038] In this embodiment, a first sealing surface 12 is provided on the box body 1, and a second sealing surface 21 is provided on the box cover 2. When the connecting member fixes the box cover 2 to the box body 1, the second sealing surface 21 is in contact with the first sealing surface 12. In this patent, the first sealing surface 12 is provided at the top of the box body 1, and the second sealing surface 21 is provided at the bottom of the box cover 2. When the connecting member fixes the box cover 2 to the box body 1 in the vertical direction, the second sealing surface 21 at the bottom of the box cover 2 is in contact with the first sealing surface 12 at the top of the box body 1, so that when the box cover 2 is closed on the box body 1, a sealed structure is formed with the box body 1, thereby enhancing the sealing effect of the battery module 8 in the cavity 11 and improving the waterproof performance of the power battery.

[0039] In this embodiment, a first sealing groove 13 is provided on the first sealing surface 12, a second sealing groove 22 is provided on the second sealing surface 21, and the sealing member is a sealing ring 3 embedded in the first sealing groove 13 and the second sealing groove 22. In this patent, a first sealing groove 13 is provided on the first sealing surface 12 at the top of the box body 1, a second sealing groove 22 is provided on the second sealing surface 21 at the bottom of the box cover 2, and the sealing member is a sealing ring 3.

[0040] When the connector fixes the box cover 2 to the box body 1 in the vertical direction so that the box cover 2 is covered on the box body 1, the sealing ring 3 is simultaneously embedded in the first sealing groove 13 and the second sealing groove 22. The sealing ring 3 is limited by the first sealing groove 13 and the second sealing groove 22, so that the sealing ring 3 seals the gap between the first sealing surface 12 and the second sealing surface 21, further enhancing the sealing effect of the battery module 8 in the cavity 11 and improving the waterproof performance of the power battery.

[0041] In this patent, the first sealing groove 13 and the second sealing groove 22 can be closed-loop grooves in square, circular or other shapes, and the sealing ring 3 is a closed-loop sealing ring 3 that is adapted to the contours of the first sealing groove 13 and the second sealing groove 22, so that the sealing ring 3 seals the gap between the first sealing surface 12 and the second sealing surface 21 on all sides, further enhancing the sealing effect of the battery module 8 in the cavity 11 and improving the waterproof performance of the power battery.

[0042] Specifically, in actual implementation, the sealing ring 3 can be made of elastic materials such as rubber and silicone. When the connecting piece fixes the box cover 2 and the box body 1 in the vertical direction, the sealing ring 3 is squeezed, which makes the connection between the box cover 2 and the box body 1 tighter and enables the sealing ring 3 to better seal the gap between the first sealing surface 12 and the second sealing surface 21, thereby further improving the waterproof performance of the power battery.

[0043] In this embodiment, the first sealing surface 12 is provided with a threaded hole 14 along the vertical direction, which is distributed inside the first sealing groove 13. The second sealing surface 21 is provided with a through hole 23 along the vertical direction, which is distributed inside the second sealing groove 22. The connecting member is a bolt 4, one end of which passes through the through hole 23 and is screwed to the threaded hole 14. In this patent, the threaded hole 14 is provided on the first sealing surface 12, extending vertically on the box body 1 and located inside the first sealing groove 13. The through hole 23 is provided on the second sealing surface 21, which passes vertically through the box cover 2 and is located inside the second sealing groove 22.

[0044] The connecting member is a bolt 4, which is inserted through the through-hole 23 at one end above the box cover 2 and then screwed into the threaded hole 14, thereby fixing the box cover 2 to the box body 1. In this patent, since the through-hole 23 and the threaded hole 14 are both arranged in the vertical direction, when the bolt 4 is inserted through the through-hole 23 at one end in the vertical direction and then screwed into the threaded hole 14, the space occupied by the bolt 4 in the box body 1 can be reduced, thereby improving the volume energy density of the power battery and extending the endurance of the electric bicycle.

[0045] In this patent, the threaded hole 14 is arranged on the inner side of the first sealing groove 13 and the through hole 23 is arranged on the inner side of the second sealing groove 22, so that after one end of the bolt 4 passes through the through hole 23 in the vertical direction and is screwed to the threaded hole 14, the sealing ring 3 is on the outside of the bolt 4 to seal the gap between the first sealing surface 12 and the second sealing surface 21. At this time, the sealing ring 3 also has a sealing effect on the bolt 4, thereby preventing the bolt 4 from contacting with water, causing corrosion of the bolt 4, and affecting the stability of the waterproof structure of the battery.

[0046] In this embodiment, the battery waterproof structure also includes a connector seat 5 provided on the box cover 2, and a sealing cover 6 movably connected to the connector seat 5. The connector seat 5 is provided with a charge and discharge interface 51 for charging and discharging the battery module 8, and the sealing cover 6 is used to open or close the charge and discharge interface 51. In this patent, the battery waterproof structure also includes a connector and a sealing cover 6. The connector seat 5 is provided on the box cover 2, and the charge and discharge interface 51 is provided on the connector seat 5. The sealing cover 6 is movably connected to the connector seat 5, so that the sealing cover 6 can open or close the charge and discharge interface 51.

[0047] When the battery module 8 is loaded in the cavity 11 of the box body 1 and the box cover 2 is closed on the box body 1, the charge and discharge interface 51 on the connector seat 5 can be opened through the sealing cover 6, so that the charge and discharge interface 51 can be used to charge and discharge the battery module 8, thereby ensuring the normal use of the power battery; when the battery module 8 does not need to be charged and discharged, the charge and discharge interface 51 on the connector seat 5 can be closed through the sealing cover 6, thereby preventing water or other debris from entering the cavity 11 of the box body 1 through the charge and discharge interface 51, further improving the waterproof performance of the power battery.

[0048] In this embodiment, the connector base 5 is provided with an insertion groove 52, which is provided on the outer periphery of the charge and discharge interface 51. The sealing cover 6 is provided with an insertion portion 61 that plugs into the insertion groove 52, and a flexible connecting belt 62 connected to the connector base 5. In this patent, the sealing cover 6 is provided with a flexible connecting belt 62, which is connected to the connector base 5. The flexible connecting belt 62 is deformable to achieve a movable connection between the sealing cover 6 and the connector base 5.

[0049] When the battery module 8 does not need to be charged or discharged, the sealing cover 6 is movably connected to the connector base 5 via the flexible connecting strip 62, so that the plug-in portion 61 on the sealing cover 6 is plugged into and engaged with the plug-in slot 52 on the connector base 5. Since the plug-in slot 52 is located on the periphery of the charge and discharge interface 51, the plug-in portion 61 can be plugged into and engaged with the plug-in slot 52 to seal the charge and discharge interface 51, thereby preventing water or other debris from entering the cavity 11 of the box body 1 through the charge and discharge interface 51, further improving the waterproof performance of the power battery.

[0050] When the battery module 8 needs to be charged and discharged, the sealing cover 6 and the connector seat 5 are movably connected through the flexible connecting belt 62, so that the plug-in portion 61 on the sealing cover 6 can be disengaged from the plug-in slot 52 on the connector seat 5, thereby opening the charge and discharge interface 51 on the connector seat 5, making it convenient for external charging and discharging equipment to charge and discharge the battery module 8 through the charge and discharge interface 51, thereby ensuring the normal use of the power battery.

[0051] In this embodiment, the battery waterproof structure further includes a mounting bracket 7 disposed in the cavity 11, which is used to secure the battery module 8. In this patent, the battery waterproof structure further includes a mounting bracket 7, which is disposed in the cavity 11 of the case 1. When the battery module 8 is loaded in the cavity 11, the mounting bracket 7 secures the battery module 8, thereby preventing the battery module 8 from shaking in the cavity 11 of the case 1, thereby ensuring the stability of the power battery structure and thereby protecting the service life of the power battery.

[0052] In this embodiment, the mounting bracket 7 includes a top bracket 71 for fixing the top of the battery module 8, and a bottom bracket 72 for fixing the bottom of the battery module 8. The top bracket 71 and the bottom bracket 72 are both provided with a limiting groove 711 that is adapted to the outer contour of the battery module 8. In this patent, the mounting bracket 7 includes a top bracket 71 and a bottom bracket 72. The limiting groove 711 is provided on the top bracket 71 and the bottom bracket 72, and the size of the limiting groove 711 is adapted to the outer contour size of the battery module 8.

[0053] When the battery module 8 is loaded in the cavity 11 of the box body 1, the top of the battery module 8 is inserted into the limiting groove 711 of the top bracket 71, and the bottom of the battery module 8 is inserted into the limiting groove 711 of the bottom bracket 72, so that the top bracket 71 fixes the top of the battery module 8 and the bottom bracket 72 fixes the bottom of the battery module 8, further preventing the battery module 8 from shaking in the cavity 11 of the box body 1, ensuring the stability of the power battery structure, and thus ensuring the service life of the power battery.

[0054] An embodiment of the present invention further provides a power battery, comprising the above-mentioned battery waterproof structure, and further comprising a plurality of battery modules 8 installed in the cavity 11 .

[0055] Since the power battery includes multiple battery modules 8, and the multiple battery modules 8 are installed in the cavity 11 of the box body 1 at the same time, in this patent, multiple limiting grooves 711 are provided on the top bracket 71 and the bottom bracket 72. By inserting the top of each battery module 8 into the corresponding limiting groove 711 of the top bracket 71 and the bottom into the corresponding limiting groove 711 of the bottom bracket 72, the top bracket 71 and the bottom bracket 72 can fix multiple battery modules 8 at the same time, thereby making the structure of the power battery simpler and more stable.

[0056] Since in this patent, each limiting groove 711 on the top bracket 71 and the bottom bracket 72 can fix one battery module 8, in this embodiment, the number of limiting grooves 711 provided on the top bracket 71 and the bottom bracket 72 can be greater than or equal to the number of battery modules 8 in the power battery, so that the battery modules 8 in the power battery can be increased or decreased according to actual needs, thereby increasing the scope of application of the power battery and enhancing the practicality of the power battery.

[0057] An embodiment of the present utility model further provides an electric bicycle, comprising the above-mentioned power battery and a vehicle body, wherein the power battery is arranged on the vehicle body.

[0058] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the scope of protection of the present invention.

[0059] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0060] Finally, it should be noted that the above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art will appreciate that modifications may be made to the technical solutions described in the above embodiments, or that some of the technical features may be replaced with equivalents; and such modifications or replacements do not deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A battery waterproof structure, characterized by: The invention comprises a box body (1) having a cavity (11) therein, a box cover (2) covering the box body (1), a sealing member provided between the box cover (2) and the box body (1), and a connecting member connecting the box cover (2) and the box body (1); the top opening of the cavity (11) is used to load a battery module (8), the box cover (2) is used to close the top opening of the cavity (11), the sealing member is used to seal the box body (1) and the box cover (2), and the connecting member fixes the box cover (2) and the box body (1) in a vertical direction.

2. A battery waterproof structure as claimed in claim 1, characterized in that: The box body (1) is provided with a first sealing surface (12), and the box cover (2) is provided with a second sealing surface (21). When the connecting member fixedly connects the box cover (2) to the box body (1), the second sealing surface (21) is in contact with the first sealing surface (12).

3. A battery waterproof structure as claimed in claim 2, characterized in that: A first sealing groove (13) is provided on the first sealing surface (12), a second sealing groove (22) is provided on the second sealing surface (21), and the sealing member is a sealing ring (3) embedded in the first sealing groove (13) and the second sealing groove (22).

4. A battery waterproof structure as claimed in claim 3, characterized in that: The first sealing surface (12) is provided with a threaded hole (14) along the vertical direction, and the threaded hole (14) is distributed inside the first sealing groove (13). The second sealing surface (21) is provided with a through hole (23) along the vertical direction, and the through hole (23) is distributed inside the second sealing groove (22). The connecting member is a bolt (4) with one end passing through the through hole (23) and then being screwed to the threaded hole (14).

5. A battery waterproof structure as claimed in claim 1, characterized in that: The battery waterproof structure further comprises a connector seat (5) provided on the box cover (2), and a sealing cover (6) movably connected to the connector seat (5); a charge and discharge interface (51) for charging and discharging the battery module (8) is provided on the connector seat (5); and the sealing cover (6) is used to open or close the charge and discharge interface (51).

6. A battery waterproof structure as claimed in claim 5, characterized in that: The connector seat (5) is provided with a plug-in slot (52), and the plug-in slot (52) is provided on the outer periphery of the charge and discharge interface (51). The sealing cover (6) is provided with a plug-in portion (61) pluggable with the plug-in slot (52), and a flexible connecting belt (62) connected to the connector seat (5).

7. A battery waterproof structure as claimed in claim 1, characterized in that: The battery waterproof structure further comprises a mounting bracket (7) provided in the cavity (11), wherein the mounting bracket (7) is used to fix the battery module (8).

8. A battery waterproof structure as claimed in claim 7, characterized in that: The mounting bracket (7) comprises a top bracket (71) for fixing the top of the battery module (8), and a bottom bracket (72) for fixing the bottom of the battery module (8), and both the top bracket (71) and the bottom bracket (72) are provided with a limiting groove (711) adapted to the outer contour of the battery module (8).

9. A power battery, characterized in that: The battery waterproof structure comprises the battery waterproof structure according to any one of claims 1 to 8, and further comprises a plurality of battery modules (8) installed in the cavity (11).

10. An electric bicycle, characterized in that: The invention comprises the power battery as claimed in claim 9, and further comprises a vehicle body, wherein the power battery is arranged on the vehicle body.

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