A lithium battery pack for electric bicycles with a waterproof structure

Abstract

This utility model provides a lithium battery pack for electric bicycles with a waterproof structure, including a shell and a top cover. The upper end of the shell is provided with an inner ring baffle, an outer ring baffle, and a frame from the inside out. A sealing groove is provided at the interval between the inner and outer ring baffles. The top cover is provided with a plug-in ring and a rim from the inside out. The plug-in ring engages with the sealing groove. The rim is fitted around the outer circumference of the outer ring baffle and abuts against the frame. Several rubber rings are provided vertically on the outer side of the outer ring baffle, and several annular grooves are provided vertically on the inner side of the rim. These annular grooves are used to engage with the rubber rings. The inner ring baffle, outer ring baffle, sealing grooves, plug-in ring, and rim together form a multi-layered sealing structure. The sealing performance is further improved by the interaction of the rubber rings on the outer ring baffle and the annular grooves on the inner side of the rim, resulting in a good waterproof structure and effectively improving the waterproof performance of the battery pack.

Description

Technical Field

[0001] This utility model relates to the field of battery pack technology, specifically to a lithium battery pack for electric bicycles with a waterproof structure. Background Technology

[0002] With the popularization of green travel concepts and policy support, the global demand for electric bicycles as a short-distance transportation tool is growing rapidly. Lithium-ion batteries, due to their high energy density and long cycle life, are gradually replacing lead-acid batteries as the mainstream power solution. Existing top covers are typically fitted onto a rectangular baffle on the upper part of the battery pack shell using a sleeve method. Then, one or more fixing methods, such as adhesive, screws, and ultrasonic welding, are used to fix the top cover to the battery pack shell. Conventionally, the inner side of the top cover and the outer side of the rectangular baffle are bonded together to form a single-layer sealed structure. However, during adhesive, screw, and ultrasonic welding fixation, gaps inevitably exist between the top cover and the shell. Furthermore, this single-layer sealed structure does not achieve good waterproofing, and its waterproof performance still needs improvement. Therefore, there is an urgent need for a lithium-ion battery pack with a good waterproof structure. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing a lithium battery pack for electric bicycles with a waterproof structure, thereby solving the problems described above.

[0004] This utility model provides a lithium battery pack for electric bicycles with a waterproof structure, including a shell and a top cover. The upper end of the shell is provided with an inner ring baffle, an outer ring baffle, and a frame from the inside to the outside. A sealing groove is formed at the interval between the inner ring baffle and the outer ring baffle. The top cover is provided with an insertion ring and a rim from the inside to the outside. The insertion ring is inserted into the sealing groove. The rim is sleeved on the outer periphery of the outer ring baffle and abuts against the frame. A plurality of rubber rings are provided on the outer side of the outer ring baffle along the vertical direction. A plurality of annular grooves are provided on the inner side of the rim along the vertical direction. The plurality of annular grooves are respectively sleeved with the plurality of rubber rings.

[0005] Preferably, the top cover and the housing are both rectangular structures, and the inner ring baffle, the outer ring baffle, the frame, the insertion ring, the edging, the plurality of annular grooves and the plurality of rubber rings are all rectangular ring structures.

[0006] Preferably, the bottom of the edging is provided with a fastening part, the outer ring baffle is provided with a protrusion that engages with the fastening part, and the edging is provided with a limiting groove for the protrusion to move into, the limiting groove being located at the upper end of the fastening part.

[0007] Preferably, the upper end of the protrusion is provided with a guide slope for the fastening part to abut against.

[0008] Preferably, the inner cavity of the housing is provided with an abutment platform, the abutment platform is provided with a partition, the partition is provided with a plurality of holes for wires to pass through, and the partition and the abutment platform, as well as the holes of the partition, are coated with sealant.

[0009] Preferably, the bottom end of the insertion ring is provided with a guide portion, which is a pointed structure with beveled surfaces on both the inner and outer sides.

[0010] Preferably, the sealing groove is coated with a sealant.

[0011] Preferably, a sealant is applied to the gap between the bottom of the edging and the frame.

[0012] Preferably, the top cover is connected to the top of the housing by ultrasonic welding.

[0013] Compared with the prior art, the present invention has the following advantages:

[0014] After the top cover is installed on the housing, the insertion ring on the top cover is inserted into the sealing groove at the upper end of the housing. The edging on the top cover is fitted onto the outer side of the outer ring baffle at the upper end of the housing. Thus, a multi-layer sealing structure is formed by the cooperation of the inner ring baffle, outer ring baffle, sealing groove, insertion ring, and edging. The sealing performance is further improved by the cooperation of several rubber rings on the outer ring baffle and several annular grooves on the inner side of the edging. It has a good waterproof structure and effectively improves the waterproof performance of the battery pack. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model;

[0017] Figure 2 This is a cross-sectional view of one embodiment of the present invention;

[0018] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0019] Figure 4 This is a schematic diagram of the shell structure in one embodiment of the present invention.

[0020] In the figure, 1-shell; 11-abutment platform; 12-partition; 121-hole; 2-top cover; 3-inner ring baffle; 4-outer ring baffle; 41-rubber ring; 42-protrusion; 421-guide slope; 5-frame; 6-sealing groove; 7-insertion ring; 71-guide part; 8-edge; 81-annular groove; 82-fastening part; 83-limiting groove. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0022] Example 1:

[0023] Reference Figures 1 to 4 This utility model provides a lithium battery pack for electric bicycles with a waterproof structure, including a shell 1 and a top cover 2. The upper end of the shell 1 is provided with an inner ring baffle 3, an outer ring baffle 4 and a frame 5 from the inside to the outside. A sealing groove 6 is formed at the interval between the inner ring baffle 3 and the outer ring baffle 4. The top cover 2 is provided with an insertion ring 7 and a rim 8 from the inside to the outside. The insertion ring 7 is inserted into the sealing groove 6. The rim 8 is sleeved on the outer periphery of the outer ring baffle 4 and abuts against the frame 5. A plurality of rubber rings 41 are provided on the outer side of the outer ring baffle 4 in the vertical direction. A plurality of annular grooves 81 are provided on the inner side of the rim 8 in the vertical direction. The plurality of annular grooves 81 are respectively sleeved with the plurality of rubber rings 41.

[0024] After the top cover 2 is installed on the housing 1, the insertion ring 7 on the top cover 2 is inserted into the sealing groove 6 at the upper end of the housing 1. The edging 8 on the top cover 2 is sleeved on the outside of the outer ring baffle 4 at the upper end of the housing 1. That is, the inner ring baffle 3, the outer ring baffle 4, the sealing groove 6, the insertion ring 7 and the edging 8 cooperate to form a multi-layer sealing structure. The sealing performance is further improved by the cooperation of several rubber rings 41 on the outer ring baffle 4 and several annular grooves 81 on the inner side of the edging 8. It has a good waterproof structure and effectively improves the waterproof performance of the battery pack.

[0025] Specifically, the top cover 2 and the shell 1 are both rectangular structures, and the inner ring baffle 3, outer ring baffle 4, frame 5, plug ring 7, edge band 8, several annular grooves 81 and several rubber rings 41 are all rectangular ring structures.

[0026] Example 2:

[0027] Reference Figures 1 to 4In conjunction with the technical solution of Embodiment 1, in this embodiment, the bottom of the edging 8 is provided with a fastening part 82, and the outer ring baffle 4 is provided with a protrusion 42 that engages with the fastening part 82. The edging 8 is provided with a limiting groove 83 for the protrusion 42 to move into, and the limiting groove 83 is located at the upper end of the fastening part 82. The top cover 2 is made of a plastic material with a certain degree of elasticity, so that during the movement of the fastening part 82 relative to the protrusion 42, the edging 8 can expand outwards and, under its own elasticity, reset and fasten to the bottom end of the protrusion 42.

[0028] The snap-fitting part 82 and the protrusion 42 are used to achieve the snap-fitting fit between the top cover 2 and the housing 1. The gap fit between the limiting groove 83 and the protrusion 42 increases the sealing contact area between the top cover 2 and the housing 1, further improving its sealing performance. This snap-fitting fit also helps to stabilize the connection between the top cover 2 and the housing 1.

[0029] Furthermore, the upper end of the protrusion 42 is provided with a guide slope 421 for the fastening part 82 to abut against.

[0030] By setting the guide slope 421, the fastening part 82 can be effectively guided to move along the guide slope 421 and smoothly move along the periphery of the protrusion 42 to the lower end of the protrusion 42, which is conducive to the smooth progress of the fastening work.

[0031] Example 3:

[0032] Reference Figures 1 to 4 In conjunction with the technical solutions of Embodiment 1 and Embodiment 2, in this embodiment, the inner cavity of the housing 1 is provided with an abutment platform 11, the abutment platform 11 is provided with a partition 12, the partition 12 is provided with a plurality of holes 121 for wires to pass through, and sealant is applied between the partition 12 and the abutment platform 11 and at the holes 121 of the partition 12.

[0033] When installing the partition 12, the wires inside the housing 1 are first extended through the holes 121 on the partition 12. Then, the connection between the partition 12 and the abutment platform 11, as well as each hole 121, are sealed with adhesive. This effectively seals the inside of the housing 1 and further improves its overall waterproof performance.

[0034] In this embodiment, the partition 12 is a heat insulation board with heat insulation effect made of composite heat insulation material.

[0035] Example 4:

[0036] Reference Figures 1 to 4 In conjunction with the technical solutions of embodiments 1-3, in this embodiment, the bottom end of the insertion ring 7 is provided with a guide portion 71, which is a pointed structure with inclined surfaces on both the inner and outer sides.

[0037] When the top cover 2 is installed on the housing 1, the inclined surfaces on the inner and outer sides of the guide portion 71 on the plug ring 7 abut against the inner ring baffle 3 and the outer ring baffle 4 respectively, and drive the plug ring 7 to move smoothly into the sealing groove 6. That is, it plays a certain guiding role in the process of the plug ring 7 being inserted into the sealing groove 6, and provides convenience for the installation of the top cover 2.

[0038] Example 5:

[0039] Reference Figures 1 to 4 In conjunction with the technical solutions of embodiments 1-4, in this embodiment, the sealing groove 6 is coated with sealant. When installing the top cover 2, a certain amount of sealant can be injected into the sealing groove 6 first, and then the insertion ring 7 can be inserted into the sealing groove 6. The sealant fills the gap between the insertion ring 7 and the sealing groove 6, further improving its sealing performance.

[0040] Example 6:

[0041] Reference Figures 1 to 4 In conjunction with the technical solutions of embodiments 1-5, in this embodiment, sealant is applied to the gap between the bottom of the edging 8 and the frame 5.

[0042] Based on the original multi-layer sealing structure, adhesive is used to connect and seal the edge 8 and the frame 5, further improving the sealing performance of the battery pack and strengthening the connection between the top cover 2 and the shell 1.

[0043] Specifically, the top cover 2 is connected to the top of the casing 1 by ultrasonic welding. The use of ultrasonic welding for sealing the battery pack is a conventional technique in this field and will not be elaborated upon here.

[0044] The sealant used in this application is a polyurethane sealant, silicone sealant, or epoxy resin sealant, which have good high temperature resistance and corrosion resistance.

[0045] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of this utility model without departing from the scope of the technical solution of this utility model shall fall within the protection scope of this technical solution.

Claims

1. A lithium battery pack for an electric bicycle with a waterproof structure, characterized by, The device includes a housing and a top cover. The upper end of the housing is provided with an inner ring baffle, an outer ring baffle, and a frame from the inside to the outside. A sealing groove is formed at the interval between the inner ring baffle and the outer ring baffle. The top cover is provided with an insertion ring and a edging from the inside to the outside. The insertion ring is inserted into the sealing groove. The edging is sleeved on the outer periphery of the outer ring baffle and abuts against the frame. A plurality of rubber rings are provided on the outer side of the outer ring baffle along the vertical direction. A plurality of annular grooves are provided on the inner side of the edging along the vertical direction. The plurality of annular grooves are respectively sleeved with the plurality of rubber rings.

2. The lithium battery pack for electric bicycles with a waterproof structure according to claim 1, characterized in that, Both the top cover and the housing are rectangular structures, and the inner ring baffle, the outer ring baffle, the frame, the insertion ring, the edging, the several annular grooves and the several rubber rings are all rectangular ring structures.

3. A lithium battery pack for electric bicycles with a waterproof structure according to claim 1, characterized in that, The bottom of the edging is provided with a fastening part, and the outer ring baffle is provided with a protrusion that engages with the fastening part. The edging is provided with a limiting groove for the protrusion to move into, and the limiting groove is located at the upper end of the fastening part.

4. A lithium battery pack for electric bicycles with a waterproof structure according to claim 3, characterized in that, The upper end of the protrusion is provided with a guide slope for the fastening part to abut against.

5. A lithium battery pack for electric bicycles with a waterproof structure according to claim 1, characterized in that, The inner cavity of the housing is provided with a contact platform, a partition is provided on the contact platform, and a plurality of holes are provided on the partition for wires to pass through. The space between the partition and the contact platform, as well as the holes of the partition, are coated with sealant.

6. A lithium battery pack for electric bicycles with a waterproof structure according to claim 1, characterized in that, The bottom end of the plug ring is provided with a guide portion, which is a pointed structure with beveled surfaces on both the inner and outer sides.

7. A lithium battery pack for electric bicycles with a waterproof structure according to claim 1, characterized in that, The sealing groove is coated with sealant.

8. A lithium battery pack for electric bicycles with a waterproof structure according to claim 1, characterized in that, The bottom of the edging is coated with sealant at the gap between it and the frame.

9. A lithium battery pack for electric bicycles with a waterproof structure according to claim 1, characterized in that, The top cover is connected to the top of the housing by ultrasonic welding.

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