Portable battery pack for electric two-wheeled vehicle

Abstract

The utility model discloses a battery pack for a portable electric two-wheeled vehicle, and belongs to the field of electric two-wheeled vehicles. The battery pack comprises battery cells, positive electrode tabs, negative electrode tabs, connecting pieces and a battery management module, the battery cells are arranged in parallel in an even number, the positive electrode tabs and the negative electrode tabs are arranged at the two ends of the battery cells respectively, the positive electrode tabs and the negative electrode tabs of the even number of battery cells are sequentially connected through the connecting pieces, the battery cells are connected in series to form a battery cell module, and the battery management module is connected with the battery cell module. And the positive pole lug of the first odd-numbered battery cell and the negative pole lug of the last even-numbered battery cell are positioned on the same side of the battery cell module and are connected with the battery management module. The battery pack for the portable electric two-wheeled vehicle avoids bridging of power wire harnesses, reduces internal resistance and space requirements, is not easy to generate electromagnetic interference during large-current charging / discharging, and solves the problem that the battery pack for the portable electric two-wheeled vehicle in the prior art cannot meet large-rate charging / discharging requirements.

Description

Technical Field

[0001] This utility model belongs to the field of electric two-wheeled vehicles, specifically a lightweight battery pack for electric two-wheeled vehicles. Background Technology

[0002] In the current technology, batteries for lightweight electric two-wheelers mainly use multiple cylindrical or single-sided tab soft-pack small-capacity cells to form a pack. The packing process has problems such as increased internal resistance due to power harness bridging, increased space requirements, and easy electromagnetic interference during high-current charging / discharging, which cannot meet the requirements of high-rate charging / discharging. Utility Model Content

[0003] The purpose of this utility model is to provide a lightweight battery pack for electric two-wheelers, which connects an even number of parallel-arranged battery cells via connectors, thus solving the problem that existing lightweight battery packs for electric two-wheelers cannot meet the requirements for high-rate charging / discharging.

[0004] The technical solution of this utility model is as follows: A lightweight electric two-wheeler battery pack includes: a battery cell, a positive electrode tab, a negative electrode tab, a connector, and a battery management module.

[0005] The battery cells are arranged in an even number in parallel.

[0006] The positive and negative electrodes are respectively disposed at both ends of the battery cell. The positive and negative electrodes of an even number of battery cells are connected in sequence through connectors to form a battery cell module.

[0007] The positive electrode tab of the first odd-numbered cell and the negative electrode tab of the last even-numbered cell are located on the same side of the cell module and are connected to the battery management module.

[0008] In a further embodiment, the battery pack also includes an upper cover, a lower cover, and a housing.

[0009] The upper cover, lower cover, and outer shell are connected to form a housing. The battery cell, positive electrode tab, negative electrode tab, connector, and battery management module are disposed inside the housing, which can provide physical protection for the battery cell module and battery management module.

[0010] In a further embodiment, the odd-numbered positive electrode tabs of the battery cells and the even-numbered negative electrode tabs of the battery cells are disposed on the same side.

[0011] The odd-numbered negative electrode tabs of the battery cells and the even-numbered positive electrode tabs of the battery cells are located on the same side.

[0012] The first odd-numbered positive electrode tab of the battery cell and the last even-numbered negative electrode tab of the battery cell are located on the same side.

[0013] In a further embodiment, the positive electrode tab and the negative electrode tab are sheet-like structures.

[0014] The connector includes a first connecting piece, a second connecting piece, and an insulating block. The first connecting piece is mounted on the insulating block. The electrode tab is connected to the first connecting piece. The insulating component is used to set adjacent first connecting pieces at a predetermined distance.

[0015] The two adjacent first connecting pieces are connected by the second connecting piece. The predetermined spacing between the adjacent first connecting pieces can reduce the risk of short circuit caused by poor welding and accidental contact between positive and negative electrodes when the tabs are directly connected, thereby improving the grouping efficiency.

[0016] In a further embodiment, the thickness of the end of the insulating block is greater than the sum of the thicknesses of the tab and the first connecting piece.

[0017] The insulating block is provided with a mounting groove, and the first connecting piece and the electrode are disposed in the mounting groove.

[0018] In a further embodiment, the first connecting piece is a "T"-shaped metal piece or an "L"-shaped metal piece.

[0019] In a further embodiment, the positive and negative electrode tabs are disposed at both ends along the length of the battery cell.

[0020] In a further embodiment, the ratio of the electrode tab to the cell width is ≥50%, which increases the spacing and width of the two electrodes, making the current field and temperature field distribution more reasonable during cell rate charging / discharging.

[0021] In a further embodiment, the number of battery cells is 10, 12, 14, 20, 24, or 28.

[0022] In a further embodiment, the thickness of the battery cell is between 5 and 12 mm.

[0023] The length of the battery cell is between 260 and 380 mm.

[0024] The width of the battery cell is between 53 and 63 mm. By coordinating the size and number of the battery cells, the number of battery cells can be reduced while meeting voltage and capacity requirements, thus reducing the number of electrical connections, lowering the probability of failure, and improving production efficiency. The length and width dimensions can be designed to reduce the thickness of the battery cell while ensuring its structural strength. This allows the temperature at the center of the battery cell to diffuse outward rapidly, enhancing the safety performance of the battery cell and enabling the battery cells of lightweight electric two-wheelers to pass the nail penetration test.

[0025] The beneficial effects of this utility model are as follows: This application connects the positive and negative electrodes of an even number of battery cells sequentially through connectors to form a battery cell module. The positive electrode of the first odd-numbered battery cell and the negative electrode of the last even-numbered battery cell are located on the same side of the battery cell module and connected to the battery management module. This avoids the cross-connection of the power harness, reduces internal resistance and space requirements, and is less prone to electromagnetic interference during high-current charging / discharging. This solves the problem that existing lightweight electric two-wheeled vehicle battery packs cannot meet the high-rate charging / discharging requirements. Attached Figure Description

[0026] Figure 1 This is an exploded schematic diagram of this utility model.

[0027] Figure 2 This is an exploded view of another embodiment of the present invention.

[0028] The attached figures are labeled as follows: 1. Outer shell; 2. Top cover; 3. Battery management module; 4. Connector; 41. First connecting piece; 42. Second connecting piece; 43. Insulator; 5. Positive electrode tab; 6. Battery cell; 7. Negative electrode tab; 8. Bottom cover. Detailed Implementation

[0029] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid obscuring the invention.

[0030] This application discloses a lightweight battery pack for electric two-wheelers, which connects an even number of parallel-arranged battery cells via connectors, solving the problem that existing lightweight battery packs for electric two-wheelers cannot meet the high-rate charging / discharging requirements.

[0031] First embodiment, such as Figure 1 The lightweight electric two-wheeler battery pack shown includes: a battery cell 6, a positive electrode tab 5, a negative electrode tab 7, a connector 4, a battery management module 3, an upper cover 2, a lower cover 8, and an outer casing 1.

[0032] The battery cells are arranged in an even number in parallel, such as... Figure 1 The battery cells 6 shown are arranged along the thickness direction.

[0033] Positive electrode tab 5 and negative electrode tab 7 are respectively disposed at both ends of the battery cell 6. The positive electrode tab 5 and negative electrode tab 7 of an even number of battery cells 6 are connected in sequence through connector 4, so that the battery cells 6 are connected in series to form a battery cell module. The positive electrode tab 5 and negative electrode tab 7 are respectively disposed at both ends of the battery cell 6, which can satisfy the rationality of the current field distribution when the battery cell 6 is charged / discharged at a certain rate.

[0034] The positive electrode 5 of the first odd-numbered cell 6 and the negative electrode 7 of the last even-numbered cell 6 are located on the same side of the cell module and are connected to the battery management module 3. The battery management module 3 is a circuit board used to monitor, evaluate and manage the charging and discharging of the cell 6.

[0035] The upper cover 2, the lower cover 8 and the outer shell 1 are connected to form a housing. The battery cell 6, the positive electrode tab 5, the negative electrode tab 7, the connector 4 and the battery management module 3 are connected in the manner described above and placed inside the housing. The upper cover 2, the lower cover 8 and the outer shell 1 are sealed together by welding or gluing.

[0036] like Figure 1 The odd-numbered positive electrode tabs 5 of the battery cells 6 and the even-numbered negative electrode tabs 7 of the battery cells 6 are located on the same side.

[0037] The negative electrode tab 7 of the odd-numbered battery cell 6 and the positive electrode tab 5 of the even-numbered battery cell 6 are located on the same side.

[0038] Position the positive electrode 5 of the first odd-numbered cell 6 and the negative electrode 7 of the last even-numbered cell 6 on the same side.

[0039] The positive and negative tabs 5 and 7 at the beginning and end of adjacent cells 6 are connected in sequence through connectors 4 to form a cell module with an "S" shaped structure by connecting the cells 6 in series.

[0040] Regarding the tabs and connecting pieces, such as Figure 1 The positive electrode tab 5, negative electrode tab 7, and connector 4 shown are sheet-like structures.

[0041] Positive electrode tab 5 and negative electrode tab 7 are located at both ends of the length of the cell 6.

[0042] The width ratio of the electrode tab to the battery cell is ≥50%.

[0043] like Figure 1 The width of each electrode shown is ≥50% of the width of the outer shell 1, and the widths of the positive electrode tab 5, negative electrode tab 7 and connector 4 are equal.

[0044] Regarding cell 6, the material and structure of cell 6 can be the same as the outer casing 1 of the soft-pack cell 6, or the same as the outer casing 1 of the square hard-shell cell 6. The number of cells 6 can be 10, 12, 14, 20, 24, or 28. Figure 1 The number of cells 6 shown is 10.

[0045] Among them, the thickness of cell 6 is between 5 and 12 mm. The thinner thickness facilitates the rapid outward diffusion of the center temperature of cell 6, thereby enhancing the safety performance of cell 6.

[0046] The length of cell 6 is between 260 and 380 mm, which is long enough to meet the capacity requirements of cell 6 for lightweight electric two-wheelers.

[0047] The width of cell 6 is between 53 and 63 mm. The smaller width meets the requirements of the lightweight appearance of electric two-wheelers.

[0048] The second embodiment differs from the first embodiment in that the structure of the connector 4 is different.

[0049] like Figure 2 The positive and negative electrode tabs shown are plate-like structures.

[0050] The connector 4 includes a first connecting piece 41, a second connecting piece 42, and an insulating block. The first connecting piece 41 is mounted on the insulating block. The electrode tab is connected to the first connecting piece 41. The insulating member 43 makes adjacent first connecting pieces 41 spaced apart by a predetermined distance. In a preferred embodiment, the first connecting piece 41 is embedded in the insulating block. The insulating block can be made of plastic or rubber.

[0051] Two adjacent first connecting pieces 41 are connected by a second connecting piece 42. The first connecting piece 41 and the second connecting piece 42 can be fixedly connected by welding or detachable connected by screws.

[0052] The insulating block can be placed directly between adjacent first connecting pieces 41, or as follows: Figure 2 The thickness of the end of the insulating block shown is greater than the sum of the thicknesses of the tab and the first connecting piece 41.

[0053] The insulating block is provided with a mounting groove, and the first connecting piece 41 and the electrode are disposed in the mounting groove, so that the ends of adjacent insulating blocks are connected and the adjacent first connecting pieces 41 are spaced apart by a predetermined distance.

[0054] The first connecting piece 41 is a "T"-shaped metal sheet or Figure 2 The "L"-shaped metal sheet shown, the second connecting piece 42 can be as follows: Figure 2 The metal sheet shown.

[0055] During assembly, the tabs are first welded to the side of the first connecting piece 41 in the thickness direction. When assembled, the side of the first connecting piece 41 away from the battery cell is connected by the second connecting piece 42.

[0056] As described above, although the invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the invention itself. Various changes in form and detail may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A lightweight battery pack for electric two-wheelers, characterized in that, Comprise: Battery cell, positive electrode tab, negative electrode tab, connecting piece and battery management module; The battery cells are arranged in parallel in an even number; The positive electrode tabs and the negative electrode tabs are arranged at both ends of the battery cells, and the positive electrode tabs and the negative electrode tabs of the even number of battery cells are sequentially connected by the connecting pieces to form a battery cell module in series; The positive electrode tab of the first odd number of battery cells and the negative electrode tab of the last even number of battery cells are located on the same side of the battery cell module and connected with the battery management module.

2. The battery pack for a light electric two-wheeled vehicle according to claim 1, characterized by Also include: Upper cover, lower cover and shell; The upper cover, lower cover and shell are connected to form a housing, and the battery cell, positive electrode tab, negative electrode tab, connecting piece and battery management module are arranged in the housing.

3. The battery pack for a light electric two-wheeled vehicle according to claim 1, characterized by The positive electrode tabs of the odd number of battery cells and the negative electrode tabs of the even number of battery cells are arranged on the same side; The negative electrode tabs of the odd number of battery cells and the positive electrode tabs of the even number of battery cells are arranged on the same side; The positive electrode tab of the first odd number of battery cells and the negative electrode tab of the last even number of battery cells are located on the same side.

4. The battery pack for a light electric two-wheeled vehicle according to claim 1, characterized by The positive electrode tab and the negative electrode tab are in a sheet structure; The connecting piece comprises a first connecting piece, a second connecting piece and an insulating block, the first connecting piece is mounted on the insulating block, the tab and the first connecting piece are connected, and the adjacent first connecting pieces are arranged at a predetermined interval by the insulating piece; The adjacent two first connecting pieces are connected by the second connecting piece.

5. The battery pack for a light electric two-wheeled vehicle according to claim 4, characterized by The thickness of the end of the insulating block is greater than the sum of the thicknesses of the tab and the first connecting piece; The insulating block is provided with a mounting groove, and the first connecting piece and the tab are arranged in the mounting groove.

6. The battery pack for a light electric two-wheeled vehicle according to claim 4, characterized by The first connecting piece is a "T" shaped metal sheet or an "L" shaped metal sheet.

7. The battery pack for a light electric two-wheeled vehicle according to claim 1, characterized by The positive electrode tab and the negative electrode tab are arranged at both ends of the length direction of the battery cell.

8. The battery pack for a light electric two-wheeler as claimed in claim 1 wherein, The width ratio of the tab to the battery cell is greater than or equal to 50%.

9. The battery pack for a light electric two-wheeled vehicle according to claim 1, characterized by, The number of battery cells is 10, 12, 14, 20, 24 or 28.

10. The battery pack for a light electric two-wheeled vehicle according to claim 1, characterized by, The thickness of the battery cell is between 5 and 12 mm; The length of the battery cell is between 260 and 380 mm; The width of the battery cell is between 53 and 63 mm.

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