An assembled lithium battery pack for electric bicycles

Abstract

The utility model provides a kind of assembled lithium battery pack for electric bicycle, including shell, top cover and electric core group, it is characterized in that, electric core group includes several electric cores and two support groups respectively arranged in the two sides of several electric cores, each support group is by several first unit frame and several second unit frame interlaced splicing along vertical direction, the upper and lower sides of first unit frame are equipped with several insertion posts, the upper and lower sides of second unit element are equipped with several insertion slots matched with insertion post, the first unit frame and second unit frame are equipped with several mounting blocks for the insertion of electric core, by the above structure, according to the quantity requirement of electric core and the size requirement of electric core group, specified specification first unit frame and second unit frame are selected to splicing to form two support groups of specified shape specification, and electric core is installed on the two support groups to form electric core group, suitable for the use of battery pack of multiple specifications, with the advantages of flexible adjustment, strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery pack technology, specifically to an assembled lithium battery pack for electric bicycles. Background Technology

[0002] Lithium-ion batteries weigh only 1 / 3 to 1 / 5 of lead-acid batteries, significantly reducing the overall load on the vehicle and better meeting the new national standard's weight limit of ≤55kg for electric bicycles. Furthermore, their energy density is 6-7 times that of lead-acid batteries (approximately 460-600Wh / kg), providing a longer driving range for the same volume or weight. Currently, the application of lithium-ion batteries in the electric bicycle field has become a mainstream trend, with its core advantages significantly different from traditional lead-acid batteries. The cell assembly in a lithium-ion battery pack is typically composed of multiple cells assembled with brackets. Traditional cell brackets are mostly integrally injection molded, usually consisting of upper and lower brackets. These two brackets are installed at the two poles of multiple cells, and each bracket has several mounting slots for cell insertion. This integral bracket structure is difficult to meet the cell quantity requirements of different cell modules, making it impossible to increase the number of cells. Often, it is necessary to reproduce various quantities and specifications of brackets according to the cell quantity requirements, which is time-consuming, labor-intensive, and costly. Utility Model Content

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

[0004] This utility model provides an assembled lithium battery pack for electric bicycles, including a shell, a top cover, and a cell assembly. The cell assembly includes a plurality of cells and two support groups respectively disposed on both sides of the plurality of cells. Each support group is composed of a plurality of first unit frames and a plurality of second unit frames staggered in the vertical direction. The first unit frames are provided with a plurality of insertion posts on their upper and lower sides, and the second unit frames are provided with a plurality of slots on their upper and lower sides for insertion into the insertion posts. The first unit frames and the second unit frames are each provided with a plurality of mounting blocks for insertion into the cells.

[0005] Preferably, each of the mounting blocks is provided with a mounting slot for inserting the battery cell, and the bottom of the mounting slot is provided with a connection port.

[0006] Preferably, the top of the mounting groove is provided with an annular inner conical surface structure.

[0007] Preferably, the bottom of the mounting groove is provided with a plurality of limiting parts for abutting against the end of the battery cell.

[0008] Preferably, the mounting block has a hexagonal prism structure, and the first unit frame and the second unit frame are respectively composed of a number of mounting blocks connected to form a long strip structure, with the mounting blocks on the first unit frame and the mounting blocks on the second unit frame arranged alternately.

[0009] Preferably, a connecting portion is provided at the interval between any two adjacent mounting blocks on the same first unit frame, and the upper and lower ends of the connecting portion are provided with the insertion post. The upper and lower ends of any mounting block on the same second unit frame are provided with the slot.

[0010] Preferably, the insert is a triangular prism, and the slot is a triangular prism groove that is inserted into and mates with the triangular prism.

[0011] Preferably, the number of mounting blocks on both the first unit frame and the second unit frame is six.

[0012] Preferably, the number of mounting blocks on both the first unit frame and the second unit frame is four.

[0013] Preferably, the upper portion of the insertion posts of the same first unit frame faces opposite directions to the lower portion of the first unit frame, and the upper portion of the slots of the same second unit frame faces opposite directions to the lower portion of the second unit frame.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] According to the quantity requirements of the battery cells and the size requirements of the battery cell assembly, the first unit frame and the second unit frame of a specified quantity and specifications can be selected and spliced ​​to form two support groups of a specified shape and specifications. The battery cells are then installed on the two support groups to form the battery cell assembly. It is suitable for use in battery packs of various specifications and has the advantages of flexible adjustment and strong adaptability. Attached Figure Description

[0016] 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.

[0017] Figure 1 This is a schematic diagram of the structure of the outer shell and top cover in one embodiment of the present invention;

[0018] Figure 2This is a schematic diagram of a battery cell assembly structure in one embodiment of the present invention, consisting of three first unit frames and three second unit frames, each with six mounting blocks.

[0019] Figure 3 This is a structural schematic diagram of the first unit frame in a certain embodiment of the present invention;

[0020] Figure 4 This is a structural schematic diagram of the second unit frame in a certain embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the splicing structure of the first unit frame and the second unit frame in a certain embodiment of the present invention;

[0022] Figure 6 This is a cross-sectional view of the first unit frame and the second unit frame splicing and fitting together in a certain embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of a battery cell assembly structure in one embodiment of the present invention, which consists of two first unit frames and two second unit frames with four mounting blocks.

[0024] In the diagram, 1-outer shell; 2-top cover; 3-cell assembly; 4-cell; 5-bracket assembly; 6-first unit frame; 61-insertion post; 62-connection part; 7-second unit frame; 71-slot; 8-mounting block; 81-mounting groove; 82-connection port; 83-inner conical surface; 84-limiting part. Detailed Implementation

[0025] 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.

[0026] Example 1:

[0027] Reference Figures 1 to 7 This utility model provides an assembled lithium battery pack for electric bicycles, including a shell 1, a top cover 2, and battery cells 43. The battery cells 43 include a plurality of battery cells 4 and two support groups 5 respectively disposed on both sides of the plurality of battery cells 4. Each support group 5 is composed of a plurality of first unit frames 6 and a plurality of second unit frames 7 staggered in the vertical direction. The first unit frames 6 are provided with a plurality of insertion posts 61 on both the upper and lower sides. The second unit frames 6 are provided with a plurality of slots 71 that are inserted and cooperate with the insertion posts 61 on both the upper and lower sides. The first unit frames 6 and the second unit frames 7 are provided with a plurality of mounting blocks 8 for inserting the battery cells 4.

[0028] Based on the required number of battery cells 4 and the size requirements of the constituent battery cells 43, a specified number and specification of first unit frames 6 and second unit frames 7 can be selected and spliced ​​together to form two support groups 5 with specified shapes and specifications. Battery cells 4 are then installed on these two support groups 5 to form battery cells 43. This method is suitable for use in various battery packs and offers advantages such as flexible adjustment and strong adaptability. It facilitates the assembly of various lithium battery pack specifications, including 48V, 60V, 72V, 84V, and 96V, according to usage requirements.

[0029] Specifically, each mounting block 8 is provided with a mounting slot 81 for inserting the power supply core 4, and a connection port 82 is provided at the bottom of the mounting slot 81.

[0030] After the battery cells 4 are installed on the two bracket groups 5, conductive connecting pieces are used to weld the positive and negative terminals of each battery cell 4 through the connection ports 82 on the mounting slots 81, thus completing the assembly of the entire battery cell 43. The welding connection between the conductive connecting pieces and the electrodes of the battery cell 4 further fixes the battery cell 4 to the bracket group 5, making it difficult for the battery cell 4 to detach from the bracket group 5. Welding the electrodes of each battery cell to the conductive connecting pieces (usually using spot welding) is a common technique in the field of battery pack assembly. The conductive connecting pieces are usually made of nickel, copper, or aluminum, which have good conductivity.

[0031] After the battery cell 43 is assembled, the entire battery cell 43 can be placed into the outer casing 1, the corresponding circuits can be connected, and the top cover 2 can be put on and sealed with bolts or glue to complete the assembly of the entire battery pack.

[0032] Example 2:

[0033] Reference Figures 3 to 6 In conjunction with the technical solution of Embodiment 1, in this embodiment, the top of the mounting groove 81 is provided with an annular inner conical surface 83 structure. By providing this inner conical surface 83 structure, it is beneficial to guide the battery cell 4 to slide along the inner conical surface 83 to align with the mounting groove 81 and insert it into the mounting groove 81 during the insertion process of the battery cell 4 into the mounting groove 81, thus facilitating the installation operation of the battery cell 4.

[0034] Specifically, the bottom of the mounting slot 81 is provided with several limiting parts 84 for contacting the ends of the battery cell 4.

[0035] By setting the limiting part 84, the end of the battery cell 4 can be limited to prevent the end of the battery cell 4 from going out of the mounting groove 81.

[0036] Example 3:

[0037] Reference Figures 2 to 7In conjunction with the technical solutions of Embodiment 1 and Embodiment 2, in this embodiment, the mounting block 8 has a hexagonal prism structure, and the first unit frame 6 and the second unit frame 7 are respectively composed of a number of mounting blocks 8 connected to form a long strip structure. The mounting blocks 8 on the first unit frame 6 and the mounting blocks 8 on the second unit frame 7 are arranged alternately.

[0038] Specifically, a connecting part 62 is provided at the interval between any two adjacent mounting blocks 8 on the same first unit frame 6, and a plug post 61 is provided at both the upper and lower ends of the connecting part 62. A slot 71 is provided at both the upper and lower ends of any mounting block 8 on the same second unit frame 7.

[0039] By utilizing the hexagonal prism shape of the mounting block 8, the first unit frame 6 and the second unit frame 7 are arranged in a staggered manner. That is, the strip-shaped first unit frame 6 and the second unit frame 7 are spliced ​​together in a "gap-in" manner, reducing the gap between the first unit frame 6 and the second unit frame 7, which can effectively reduce space occupation and improve space utilization.

[0040] The insert 61 is a triangular prism, and the slot 71 is a triangular prism groove that is inserted and mated with the triangular prism.

[0041] Compared to using cylindrical plug-in method, this application uses triangular prism and triangular prism slot plug-in method to form a more stable splice and avoid twisting and loosening at the connection between the first unit frame 6 and the second unit frame 7.

[0042] Example 4:

[0043] Reference Figure 2 For example, in conjunction with the technical solutions of embodiments 1-3, in this embodiment, the number of mounting blocks 8 on both the first unit frame 6 and the second unit frame 7 is six. The illustrated structure is a staggered installation structure of three first unit components and three second unit frames 7.

[0044] Example 5:

[0045] Reference Figure 7 For example, in conjunction with the technical solutions of embodiments 1-3, in this embodiment, the number of mounting blocks 8 on both the first unit frame 6 and the second unit frame 7 is four. The illustrated structure is a staggered mounting structure of two first unit components and two second unit frames 7.

[0046] Example 6:

[0047] Reference Figures 2 to 7In conjunction with the technical solutions of embodiments 1-5, in this embodiment, the upper plurality of insert posts 61 of the same first unit frame 6 face opposite directions to the lower plurality of insert posts 61 of the same first unit frame 6, and the upper plurality of slots 71 of the same second unit frame 7 face opposite directions to the lower plurality of slots 71 of the same second unit frame 7. Compared with the matching of insert posts 61 and slots 71 with the same orientation, using slots 71 and insert posts 61 with opposite orientations eliminates the need for multiple flipping and splicing operations during the assembly of several first unit frames 6 and several second unit frames 7, providing operational convenience.

[0048] To meet market demand, the number of battery cells 4 in this application can be increased to 48, and they can be spliced ​​together with the first unit frame 6 and the second unit frame 7 of corresponding quantity and specifications to form battery cell group 3.

[0049] 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. An assembled lithium battery pack for electric bicycles, comprising a shell, a top cover, and a battery cell assembly, characterized in that, The battery cell assembly includes several battery cells and two support groups respectively disposed on both sides of the several battery cells. Each support group is composed of several first unit frames and several second unit frames staggered in the vertical direction. Several insertion posts are provided on the upper and lower sides of the first unit frames, and several slots that are inserted and mated with the insertion posts are provided on the upper and lower sides of the second unit frames. Several mounting blocks for inserting the battery cells are provided on both the first unit frames and the second unit frames.

2. The assembled lithium battery pack for electric bicycles according to claim 1, characterized in that, Each of the mounting blocks is provided with a mounting slot for inserting the battery cell, and the bottom of the mounting slot is provided with a connection port.

3. The assembled lithium battery pack for electric bicycles according to claim 2, characterized in that, The top of the mounting groove is provided with an annular inner conical surface structure.

4. The assembled lithium battery pack for electric bicycles according to claim 2, characterized in that, The bottom of the mounting groove is provided with several limiting parts for abutting against the end of the battery cell.

5. The assembled lithium battery pack for electric bicycles according to claim 1, characterized in that, The mounting block has a hexagonal prism structure. The first unit frame and the second unit frame are each composed of a number of mounting blocks connected to form a long strip structure. The mounting blocks on the first unit frame and the mounting blocks on the second unit frame are arranged alternately.

6. The assembled lithium battery pack for electric bicycles according to claim 5, characterized in that, A connecting portion is provided at the interval between any two adjacent mounting blocks on the same first unit frame, and the upper and lower ends of the connecting portion are provided with the insertion post. The upper and lower ends of any mounting block on the same second unit frame are provided with the slot.

7. An assembled lithium battery pack for an electric bicycle according to any one of claims 1 or 6, characterized in that, The insert is a triangular prism, and the slot is a triangular prism groove that is inserted into and mates with the triangular prism.

8. The assembled lithium battery pack for electric bicycles according to claim 1, characterized in that, The number of mounting blocks on both the first unit frame and the second unit frame is six.

9. The assembled lithium battery pack for electric bicycles according to claim 1, characterized in that, The number of mounting blocks on both the first unit frame and the second unit frame is four.

10. An assembled lithium battery pack for an electric bicycle according to claim 1, characterized in that, The upper portion of the first unit frame has several insertion posts facing opposite directions to the lower portion of the first unit frame, and the upper portion of the second unit frame has several slots facing opposite directions to the lower portion of the second unit frame.

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