Battery bus piece structure, battery module and battery pack

Abstract

The utility model discloses a battery bus piece structure, a battery module and a battery pack, and belongs to the technical field of lithium batteries. The battery bus bar structure comprises a parallel connection part, a series connection part and a protection part, the parallel connection part comprises a positive electrode connection part and a negative electrode connection part, the positive electrode connection part is used for being connected with a positive electrode end of a battery cell, and the negative electrode connection part is used for being connected with a negative electrode end of the battery cell; the series connection part is used for connecting the positive electrode connection part and the negative electrode connection part in the parallel connection part; the protection part and the series connection part are integrally arranged or are connected through a connecting piece. And when the battery module has an overcurrent phenomenon, the protection part is subjected to overcurrent fusing, and the circuit is cut off, so that short-circuit protection is carried out on the battery module, and the safety performance of the battery module is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and more specifically, to a battery busbar structure, a battery module and a battery pack. Background Art

[0002] With the popularity of new energy electric vehicles, the safety of electric vehicles has attracted more and more attention from consumers. The source of spontaneous combustion of electric vehicles mostly occurs in the power battery. Inside the power battery, the single battery generally adopts the passive design of explosion-proof valve for safety protection. The battery pack generally has a short-circuit mechanism in the whole pack to ensure the safety of the whole pack, but there is a lack of corresponding external short-circuit protection mechanism in the battery module unit. If the insulation skin of the battery cell is damaged, it is easy to overlap with the surrounding battery cells through the welded busbars to form a loop and short circuit, causing the whole pack to lose control. Utility Model Content

[0003] The utility model provides a battery busbar structure, a battery module and a battery pack, which solve the problem that the existing battery module lacks a corresponding short-circuit protection structure.

[0004] In order to achieve the above-mentioned purpose, the technical solution provided by the utility model is:

[0005] A battery busbar structure, comprising

[0006] The parallel connection part includes a positive electrode connection part and a negative electrode connection part, wherein the positive electrode connection part is used to connect to the positive terminal of the battery cell, and the negative electrode connection part is used to connect to the negative terminal of the battery cell;

[0007] A series connection part, used to connect the positive electrode connection part and the negative electrode connection part in the parallel connection part;

[0008] The protection part is integrated with the series part or connected with the series part through a connecting piece.

[0009] Furthermore, when the protection portion and the series connection portion are integrally arranged, a notch is formed on one side of the series connection portion to form the protection portion.

[0010] Furthermore, when the protection portion and the series connection portion are integrally arranged, the protection portion is formed by opening notches on both sides of the series connection portion.

[0011] Further, when the protection part is connected to the series connection part through a connecting member,

[0012] The series connection part includes a first series connection part and a second series connection part, and both ends of the protection part are connected to the first series connection part and the second series connection part through connecting members, respectively.

[0013] Furthermore, the connecting member is a bolt or a screw.

[0014] Furthermore, the connecting piece is a welding connection point.

[0015] Furthermore, the positive electrode connecting portion and the negative electrode connecting portion are centrally symmetrical or axisymmetrically arranged relative to the center of the series connection portion.

[0016] Further, the positive electrode connecting portion includes a first parallel portion and a second parallel portion connected together, and the first parallel portion and the second parallel portion are distributed in a comb-teeth shape;

[0017] The structure of the negative electrode connection part is consistent with the structure of the positive electrode connection part.

[0018] The utility model also provides a battery module, comprising a plurality of battery cells and the battery busbar structure, wherein at least two battery cells are connected in parallel on each of the first parallel parts or the second parallel parts.

[0019] The utility model also provides a battery pack, comprising the battery module.

[0020] Compared with the prior art, the technical solution provided by the utility model has the following beneficial effects:

[0021] (1) The battery busbar structure of the utility model includes a series part, a parallel part and a protection part. The parallel part is connected to the series part, and the protection part is arranged at the series part. When an overcurrent occurs in the battery module, the protection part is blown by the overcurrent fuse and the circuit is cut off, thereby short-circuiting the battery module and improving the safety performance of the battery module.

[0022] (2) In the battery busbar structure of the present invention, the protection part is formed by opening a notch on the series connection part, so that the protection part and the series connection part are integrated together, which simplifies the protection part setting method and improves the protection part setting efficiency.

[0023] (3) The battery bus structure of the utility model comprises a series connection portion including a first series connection portion and a second series connection portion, and both ends of the protection portion are respectively connected to the first series connection portion and the second series connection portion. After the protection portion is blown, only the protection portion needs to be replaced without replacing the entire battery bus, which facilitates the maintenance of the battery module and reduces the cost of reworking the battery module.

[0024] The battery module includes a battery busbar structure and has all the beneficial effects of the battery busbar structure.

[0025] The battery pack includes a battery module and has all the beneficial effects of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the battery busbar structure in Example 1;

[0027] Figure 2 This is a schematic diagram of the battery busbar structure in the second embodiment.

[0028] Description of labels:

[0029] 1. Series part; 11. First series part; 12. Second series part; 2. Parallel part; 21. First parallel part; 22. Second parallel part; 3. Protection part; 31. Notch. DETAILED DESCRIPTION

[0030] In order to further understand the content of the utility model, the utility model is described in detail in conjunction with the drawings and embodiments.

[0031] Embodiment 1

[0032] like Figure 1 As shown, the battery busbar structure provided in this embodiment includes a series connection portion 1 , a parallel connection portion 2 and a protection portion 3 .

[0033] Specifically, the parallel part 2 includes a positive electrode connection part and a negative electrode connection part, the positive electrode connection part is used to connect to the positive terminal of the battery cell, and the negative electrode connection part is used to connect to the negative terminal of the battery cell. The series part 1 is used to connect the positive electrode connection part and the negative electrode connection part in the parallel part 2. The protection part 3 is integrated with the series part 1.

[0034] In this embodiment, the protection part 3 is formed after a notch 31 is opened on both sides of the series connection part 1 at a place of the series connection part 1. Specifically, the width of the protection part 3 formed after the notch 31 is opened is smaller than the width of the series connection part 1, so that the protection part 3 can play the role of overcurrent protection. By integrally arranging the protection part 3 on the series connection part 1, the arrangement method of the protection part 3 can be simplified and its arrangement efficiency can be improved.

[0035] In other cases, a notch 31 is formed on one side of the series connection part 1 to form the protection part 3. The formation method of the protection part 3 is not limited, and the protection part 3 and the series connection part 1 are only integrated together.

[0036] In this embodiment, a protection part 3 is provided in the battery busbar to provide short circuit protection for the battery module formed by the cells connected to the battery busbar, thereby improving the safety performance of the battery module.

[0037] Furthermore, the positive electrode connection part and the negative electrode connection part are centrally symmetrical or axially symmetrically arranged relative to the center of the series connection part 1. Moreover, the positive electrode connection part includes a first parallel part 21 and a second parallel part 22 connected together, and the first parallel part 21 and the second parallel part 22 are arranged in a comb-tooth shape. The structure of the negative electrode connection part is consistent with that of the positive electrode connection part.

[0038] Embodiment 2

[0039] like Figure 2As shown, the battery busbar structure provided in this embodiment includes a series connection part 1, a parallel connection part 2 and a protection part 3. The structure and arrangement of the parallel connection part 2 in this embodiment are consistent with those in the first embodiment. However, in this embodiment, the protection part 3 is connected to the series connection part 1 through a connector.

[0040] In this embodiment, the series connection part 1 includes a first series connection part 11 and a second series connection part 12, and both ends of the protection part 3 are respectively connected to the first series connection part 11 and the second series connection part 12 through connectors. The protection part 3 is a replaceable fuse, and when a short circuit occurs, the fuse blows and cuts off the circuit, thereby protecting the battery module from short circuit.

[0041] The protection portion 3 may be connected to the first series portion 11 and the second series portion 12 by bolts or screws; or may be connected to the first series portion 11 and the second series portion 12 by welding.

[0042] The protection part 3 is connected to the series part 1 through a connector, so that after the protection part 3 is blown, only the protection part 3 needs to be replaced without replacing the entire battery busbar, which facilitates the maintenance of the battery module and reduces the cost of reworking the battery module.

[0043] The utility model further provides a battery module, comprising a plurality of battery cells and the battery busbar structure of the first or second embodiment, wherein at most two battery cells are connected in parallel on each first parallel portion 21 or the second parallel portion 22 .

[0044] The utility model also provides a battery pack, comprising the battery module.

[0045] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inside" and "outside" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] The protection scope of the present invention is limited only by the claims. Thanks to the teachings of the present invention, those skilled in the art will easily recognize that alternative structures to the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A battery busbar structure, characterized in that: include, The parallel connection part (2) comprises a positive electrode connection part and a negative electrode connection part, wherein the positive electrode connection part is used to connect to the positive terminal of the battery cell, and the negative electrode connection part is used to connect to the negative terminal of the battery cell; A series connection part (1) used to connect the positive electrode connection part and the negative electrode connection part in the parallel connection part (2); The protection part (3) is integrally arranged with the series connection part (1) or is connected to the series connection part (1) via a connecting piece.

2. The battery busbar structure according to claim 1, characterized in that: When the protection portion (3) and the series connection portion (1) are arranged in an integrated manner, a notch (31) is provided on one side of the series connection portion (1) to form the protection portion (3).

3. The battery busbar structure according to claim 1, characterized in that: When the protection portion (3) and the series connection portion (1) are arranged in an integrated manner, the protection portion (3) is formed by opening notches (31) on both sides of the series connection portion (1).

4. The battery busbar structure according to claim 1, characterized in that: When the protection part (3) is connected to the series connection part (1) via a connecting piece, The series connection part (1) comprises a first series connection part (11) and a second series connection part (12), and two ends of the protection part (3) are respectively connected to the first series connection part (11) and the second series connection part (12) through connecting pieces.

5. The battery busbar structure according to claim 4, characterized in that: The connecting piece is a bolt or a screw.

6. The battery busbar structure according to claim 4, characterized in that: The connecting piece is a welding connection point.

7. The battery busbar structure according to any one of claims 1 to 6, characterized in that: The positive electrode connecting portion and the negative electrode connecting portion are arranged in a centrally symmetrical or axisymmetric manner relative to the center of the series connection portion (1).

8. The battery busbar structure according to claim 7, characterized in that: The positive electrode connecting portion comprises a first parallel portion (21) and a second parallel portion (22) connected together, and the first parallel portion (21) and the second parallel portion (22) are distributed in a comb-teeth shape; The structure of the negative electrode connection part is consistent with the structure of the positive electrode connection part.

9. A battery module, characterized in that: It comprises a plurality of battery cells and the battery busbar structure according to claim 8, wherein at least two battery cells are connected in parallel on each of the first parallel connection parts (21) or the second parallel connection parts (22).

10. A battery pack, characterized in that: Comprising the battery module as claimed in claim 9.

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