Battery cell connecting piece and battery pack

Abstract

The utility model relates to a battery cell connecting piece and a battery pack, the battery cell connecting piece is in a parallelogram shape, and the battery cell connecting piece comprises at least four connecting holes used for being connected with a battery cell. The parallelogram-shaped battery cell connecting sheets respectively connected with the four battery cells are more stable in structure, the battery cells are fixed at the output ends of the battery cells, and the overall structure of the battery pack is enhanced. And moreover, the battery cell connecting piece is low in manufacturing difficulty, simple in production process, low in aluminum material cost and easy to popularize. The corresponding battery pack has the advantages of being low in cost and not prone to damage, and the safety and endurance requirements of the combined battery pack can be better met.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell connecting sheet and a battery pack. Background Art

[0002] With the widespread popularity of lithium battery products, garden power tools have also entered the users' field of vision, and battery packs for garden tools have gradually shifted from low-voltage platforms to high-voltage platforms.

[0003] At present, the specifications of electric hand-held tools and electric riding equipment are getting larger and larger, while the battery packs on the market have low battery life. A single battery pack can basically not meet the battery life needs of users, and the safety of multiple battery packs combined is poor and the cost is high. The battery cell connector in the battery pack is used to connect the battery cells. The existing battery cell connector has poor connection stability and high cost, especially when used in the combined battery pack, it is difficult to meet the working requirements of riding garden tools and hand-held garden tools.

[0004] In view of this, it is indeed necessary to provide an improved battery cell connector and battery pack to overcome the defects of the prior art. Utility Model Content

[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a battery cell connecting sheet and a battery pack with strong structural stability and low cost.

[0006] The present application provides a battery cell connecting sheet, which is in the shape of a parallelogram and includes at least four connecting holes for connecting with the battery cells.

[0007] A further improvement is that the cell connection sheet includes four cell connection areas respectively located at four corners, the outer peripheral shape of the cell connection area corresponds to the outer peripheral shape of the end of the cell, and the connection hole is arranged in the center of the cell connection area.

[0008] A further improvement is that the four corners of the battery cell connecting piece have arc-shaped chamfers.

[0009] A further improvement is that the outer periphery of the battery cell connection area is circular.

[0010] A further improvement is that the battery cell connecting piece is integrally formed.

[0011] A further improvement is that the thickness of the battery cell connecting sheet is greater than or equal to 0.35 mm.

[0012] A further improvement is that the battery cell connecting piece is an aluminum part.

[0013] A battery pack, comprising a plurality of the battery cell connecting sheets, and further comprising:

[0014] Support frame;

[0015] A plurality of battery cells are fixed to the support frame;

[0016] Wherein, the battery cell connecting sheet is connected to the output end of the battery cell.

[0017] A further improved solution is: there are multiple battery cell connecting sheets, and the multiple battery cell connecting sheets are arranged at intervals at the upper and lower ends of the battery cell;

[0018] A single battery cell connecting sheet is connected to the output ends of at most four battery cells at the same time.

[0019] A further improvement is that the nominal voltage of the battery cell is greater than or equal to 3.2V, and the nominal capacity is greater than or equal to 15AH.

[0020] Compared with the prior art, the utility model has the following beneficial effects: the battery cell connection sheet is in the shape of a parallelogram, and includes at least four connection holes for connecting to the battery cells. The parallelogram-shaped battery cell connection sheet, which is respectively connected to four battery cells, has a more stable structure, fixes the battery cells at the output ends of the battery cells, and provides reinforcement for the overall structure of the battery pack. Moreover, the manufacturing difficulty of the above-mentioned battery cell connection sheet is low, the production process is simple, the aluminum material cost is low, and it is easy to promote. The specific advantages of the corresponding battery pack are low cost and not easy to damage, which is more conducive to meeting the safety and endurance requirements of the assembled battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of a battery core connecting piece of a preferred embodiment of the utility model;

[0022] Figure 2 for Figure 1 A top view of the battery cell connecting piece shown;

[0023] Figure 3 A three-dimensional diagram of a battery pack provided for a preferred embodiment of the utility model;

[0024] Figure 4 for Figure 3 A top view of the battery pack shown;

[0025] Figure 5 for Figure 3 Bottom view of the battery pack shown.

[0026] Meaning of the reference numerals in the figures:

[0027] Battery cell connection sheet 10 Connection hole 11

[0028] Cell connection area 12 Cell 20

[0029] Support frame 30 DETAILED DESCRIPTION

[0030] The utility model is further described in detail below in conjunction with the accompanying drawings and implementation modes.

[0031] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the following words such as "upper", "lower", "front", "back", etc. indicating orientation or positional relationship are based only on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The "including" mentioned in the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. In addition, in the embodiments of the present application, a plurality refers to two or more. In the absence of mutual contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0032] Figure 1 A three-dimensional diagram of a battery core connecting piece of a preferred embodiment of the utility model; Figure 2 for Figure 1 A top view of the battery cell connecting piece shown; Figure 3 A three-dimensional diagram of a battery pack provided for a preferred embodiment of the utility model; Figure 4 for Figure 3 A top view of the battery pack shown; Figure 5 for Figure 3 Bottom view of the battery pack shown.

[0033] Please refer to Figure 1 and Figure 2, the embodiment of the present application provides a cell connection sheet 10 for connecting the cells 20 of the battery pack. In the present embodiment, a plurality of cells 20 are connected in series, in parallel or in series and in parallel to form a cell group, and the cells 20 of the cell group are connected through the above-mentioned cell connection sheet 10. The cell connection sheet 10 has the function of carrying current, and also has the function of heat dissipation and structural connector. The cell connection sheet 10 of the present embodiment is in the shape of a parallelogram, and the cell connection sheet 10 includes at least four connection holes 11 for connecting with the cell 20. By setting the cell connection sheet 10 in a parallelogram shape and connecting with the cell 20 respectively through at least four connection holes 11, the structure is more stable, and the cell 20 is fixed at the output end of the cell 20, which provides reinforcement for the overall structure of the battery pack. Furthermore, the cell connection sheet 10 is integrally formed, and the integrally formed cell connection sheet 10 has a more stable structure and is not easily damaged under the action of external force, resulting in the displacement of the cell 20 or the failure of the connection of the cell 20.

[0034] In one embodiment, the cell connection sheet 10 includes four cell connection areas 12 located at four corners thereof. Correspondingly, the cell 20 is connected to the cell connection sheet 10 through the cell connection areas 12 at the four corners of the cell connection sheet 10. The outer peripheral shape of the cell connection area 12 corresponds to the outer peripheral shape of the end of the above-mentioned cell 20, so as to facilitate the installation and connection of the cell connection sheet 10 and the cell 20. The aforementioned connection hole 11 is provided in the center of the cell connection area 12 for connecting the electrodes of the cell 20.

[0035] In one embodiment, the four corners of the cell connection sheet 10 have arc chamfers, and specifically, the arc boundaries of the chamfers coincide with the outer peripheral boundaries of the cell connection area 12. Further, the outer peripheral shape of the cell connection area 12 is circular. The above design can increase the space utilization of the cell connection sheet 10, while ensuring the connection of multiple cells 20, while reducing the material used for the cell connection sheet 10.

[0036] In another embodiment, the thickness of the cell connection sheet 10 is greater than or equal to 0.35 mm. For example, the thickness of the cell connection sheet 10 is 0.35 mm, 0.40 mm, or 0.45 mm. Furthermore, the cell connection sheet 10 is an aluminum piece. The aluminum cell connection sheet 10 is cheap and has low cost, and has good heat dissipation.

[0037] The cell connection sheet 10 is in the shape of a parallelogram and includes at least four connection holes 11 for connecting to the battery cell 20. The parallelogram-shaped cell connection sheet 10 connected to four battery cells 20 respectively has a more stable structure, fixes the battery cell 20 at the output end of the battery cell, and provides reinforcement for the overall structure of the battery pack. Moreover, the manufacturing difficulty of the above-mentioned cell connection sheet 10 is low, the production process is simple, the aluminum material cost is low, and it is easy to promote. The specific advantages of the corresponding battery pack are low cost and not easy to damage, which is more conducive to meeting the safety and endurance requirements of the assembled battery pack.

[0038] Please refer to Figures 3 to 5 , the embodiment of the present application further provides a battery pack, comprising a plurality of the above-mentioned battery cell connection sheets 10, a support frame 30 and a plurality of battery cells 20. Among them, the battery cell 20 is fixed on the support frame 30, and the battery cell connection sheet 10 is connected to the output end of the battery cell 20. The above-mentioned support frame 30 is made of insulating material and is used to support the battery cell 20. In some embodiments, the battery pack also includes a shell, and the battery cell 20, the battery cell connection sheet 10 and the support frame 30 are accommodated in the shell.

[0039] In the battery pack of this embodiment, the battery cell 20 is a cylindrical structure. At least a number of single battery cells 20 are arranged in the battery pack, the number of battery cells 20 connected in parallel is greater than or equal to 2, the number of battery cells 20 connected in series is greater than or equal to 14, and the battery cells are first connected in parallel and then in series. A battery cell connection sheet 10 for electrically connecting each battery cell 20 is installed in the battery pack, and the battery cell connection sheet 10 is installed at the electrode of the battery cell 20. The battery cell connection sheet 10 is provided with a connection hole 11 at the electrode of the battery cell 20, and the connection hole 11 is circular in shape.

[0040] The battery cell 20 is cylindrical in shape, and a positive electrode and a negative electrode are disposed at both ends of the battery cell 20, and the positive electrode and the negative electrode are higher than the plane of the battery cell body. In one embodiment, there are multiple battery cell connecting pieces 10, and the multiple battery cell connecting pieces 10 are arranged at intervals at the upper and lower ends of the battery cell 20, while ensuring the connection stability of the positive and negative electrodes of the battery cell 20. In addition, a single battery cell connecting piece 10 is connected to the output ends of at most four battery cells 20 at the same time, so that the connection stability of a single battery cell connecting piece 10 is stronger.

[0041] In one embodiment, the diameter of a single battery cell 20 is greater than or equal to 38 mm, and the length is greater than or equal to 130 mm. The diameter and length are larger than those of a small cylindrical battery cell, and the volume is large, so that more energy can be provided for high-power devices. The ratio of the positive or negative electrode area of ​​the battery cell 20 to the area of ​​the positive or negative end face is greater than or equal to 0.09. A larger ratio of the area of ​​the electrode to the end face means that the discharge capacity and rate performance of the battery are increased, and the cycle stability of the battery can be improved. The cycle life is higher, the cost is lower, and the battery management is relatively simple.

[0042] In one embodiment, the nominal voltage of the battery cell 20 is greater than or equal to 3.2V, the nominal capacity is greater than or equal to 15AH, and the maximum discharge current of a single battery cell 20 is greater than that of a conventional small cylindrical battery cell.

[0043] The utility model is not limited to the above specific embodiments. A person skilled in the art can easily understand that there are many alternatives to the battery cell connector and battery pack of the utility model without departing from the principle and scope of the utility model. The protection scope of the utility model shall be based on the content of the claims.

Claims

1. A battery cell connecting sheet, characterized in that: The battery cell connecting sheet is in the shape of a parallelogram, and includes at least four connecting holes for connecting with the battery cell; The cell connection sheet includes four cell connection areas respectively located at four corners, the outer peripheral shape of the cell connection area corresponds to the outer peripheral shape of the end of the cell, and the connection hole is arranged in the center of the cell connection area.

2. The battery cell connecting sheet according to claim 1, characterized in that: The four corners of the battery core connecting sheet have arc-shaped chamfers.

3. The battery core connecting sheet according to claim 1, characterized in that: The outer periphery of the cell connection area is circular.

4. The battery cell connecting sheet according to claim 1, characterized in that: The battery core connecting piece is integrally formed.

5. The battery cell connecting sheet according to claim 1, characterized in that: The thickness of the battery core connecting sheet is greater than or equal to 0.35 mm.

6. The battery cell connecting sheet according to claim 1, characterized in that: The battery core connecting piece is an aluminum piece.

7. A battery pack, characterized in that: The method comprises a plurality of battery cell connecting sheets according to any one of claims 1 to 6, and further comprises: Support frame; A plurality of battery cells are fixed to the support frame; Wherein, the battery cell connecting sheet is connected to the output end of the battery cell.

8. The battery pack according to claim 7, characterized in that: There are a plurality of the battery cell connecting sheets, and the plurality of the battery cell connecting sheets are arranged at intervals at the upper and lower ends of the battery cell; A single battery cell connecting sheet is connected to the output ends of at most four battery cells at the same time.

9. The battery pack according to claim 7, characterized in that: The nominal voltage of the battery cell is greater than or equal to 3.2V, and the nominal capacity is greater than or equal to 15AH.

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