Composite busbar assembly and power battery

Abstract

The utility model provides a composite busbar assembly and a power battery, the composite busbar assembly comprises a series connection bus aluminum bar and a series connection bus copper bar, a deformation part is located between a first flat plate part and a second flat plate part, the deformation part is connected with the first flat plate part and the second flat plate part, and the first flat plate part and the second flat plate part are allowed to move and deform; on the basis that the deformation part deals with the movement deformation of the first flat plate part and the second flat plate part and adapts to the expansion of the first battery cell or the second battery cell, the series-connection bus copper bars are stacked on the series-connection bus aluminum bar in the vertical direction; under the same thickness of the composite busbar assembly, the series bus copper bars are welded to the series bus aluminum bars, and the series bus copper bars are copper pieces; the conductivity coefficient of the series bus copper bars is larger than that of the series bus aluminum bars, and based on the conductivity of the series bus copper bars, the conductive effect of the composite bus bar assembly is improved by arranging the series bus copper bars, and the overcurrent requirement is met.

Description

Technical Field

[0001] The utility model relates to the technical field of composite busbar components, in particular to a composite busbar component and a power battery. Background Art

[0002] With the development of science and technology, power batteries are the power sources that provide power for tools, mostly referring to batteries that provide power for electric vehicles, electric trains, electric bicycles, and golf carts.

[0003] In the prior art, the existing power battery includes a series busbar, a series busbar

[0004] It includes a first flat plate portion, a second flat plate portion and a deformation portion; the first flat plate portion is used for laser welding to the positive electrode of the first battery cell; the second flat plate portion is used for laser welding to the negative electrode of the second battery cell, and the deformation portion connects the first flat plate portion and the second flat plate portion respectively. At this time, the series bus aluminum bus is an integral aluminum part, and only relies on the series bus aluminum bus for conduction, resulting in poor conductivity of the existing composite bus. It is necessary to improve the conductivity and increase the thickness of the composite bus. Utility Model Content

[0005] The purpose of the utility model is to provide a composite busbar assembly and a power battery. Under the same thickness of the composite busbar assembly, the series busbar copper busbar is welded to the series busbar aluminum busbar; the series busbar copper busbar is a copper piece; the conductivity coefficient of the series busbar copper busbar is greater than the conductivity coefficient of the series busbar aluminum busbar, based on the conductivity of the series busbar copper busbar, so as to increase the conductivity effect of the composite busbar assembly by arranging the series busbar copper busbar to meet the overcurrent requirements.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A composite busbar assembly is applied to a power battery, and the composite busbar assembly comprises:

[0008] A series busbar, comprising a first flat plate portion, a second flat plate portion and a deforming portion; the first flat plate portion is used for laser welding to the positive electrode of the first battery cell; the second flat plate portion is used for laser welding to the negative electrode of the second battery cell; the movement of the first flat plate portion and the second flat plate portion is affected as the first battery cell or the second battery cell expands; the deforming portion is between the first flat plate portion and the second flat plate portion, the deforming portion connects the first flat plate portion and the second flat plate portion, and allows the movement and deformation of the first flat plate portion and the second flat plate portion;

[0009] The series bus copper bar is stacked on the series bus aluminum bar in the up-down direction; the series bus copper bar is welded to the series bus aluminum bar; the series bus copper bar is a copper piece; the conductivity of the series bus copper bar is greater than the conductivity of the series bus aluminum bar.

[0010] Optionally, the lower side wall of the series busbar aluminum bar is welded to the positive electrode of the first battery cell and the negative electrode of the second battery cell;

[0011] The series bus copper bar is located on the upper side of the series bus aluminum bar and is welded to the series bus aluminum bar by polymer diffusion welding.

[0012] Optionally, the series bus copper bar is flush with the series bus aluminum bar in the up-down direction;

[0013] The thickness of the series bus copper bar is equal to or unequal to the thickness of the series bus aluminum bar.

[0014] Optionally, the series bus copper bar is provided with an avoidance hole, and the avoidance hole is arranged relative to a welding position between the series bus aluminum bar and the first battery cell or the second battery cell.

[0015] Optionally, the avoidance hole is a circular hole, a square hole or a special-shaped hole.

[0016] Optionally, the flatness of the first flat plate portion and the flatness of the second flat plate portion are both less than or equal to 0.1 mm.

[0017] Optionally, the deformation portion is arranged in an arch shape or a serpentine shape.

[0018] Optionally, when the deformation portion is arranged in an arch shape, the deformation portion protrudes in an arch shape toward a side of the series busbar aluminum busbar that is away from the series busbar copper busbar; the deformation portion is provided with an arched groove;

[0019] The series busbar is provided with a first arched portion, and the first arched portion is adapted to the arched groove.

[0020] Optionally, when the deformation portion is arranged in a serpentine shape, the deformation portion protrudes in an arch shape toward a side of the series busbar aluminum busbar that is away from the series busbar copper busbar; the deformation portion is provided with a first arc groove;

[0021] The series bus copper bar is provided with a first arc portion, and the first arc portion is adapted to the arc groove.

[0022] A power battery comprises the composite busbar assembly, a first battery cell and a second battery cell; the composite busbar assembly connects the first battery cell and the second battery cell.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The utility model provides a composite busbar assembly and a power battery, wherein the series busbar aluminum busbar comprises a first flat plate portion, a second flat plate portion and a deformation portion; the first flat plate portion is used for laser welding to the positive electrode of the first battery cell; the second flat plate portion is used for laser welding to the negative electrode of the second battery cell; the movement of the first flat plate portion and the second flat plate portion is affected as the first battery cell or the second battery cell expands; the deformation portion is between the first flat plate portion and the second flat plate portion, the deformation portion connects the first flat plate portion and the second flat plate portion, and allows the first flat plate portion and the second flat plate portion to move and deform; based on the deformation portion responding to the movement and deformation of the first flat plate portion and the second flat plate portion, and adapting to the expansion of the first battery cell or the second battery cell, the series busbar copper busbar is stacked on the series busbar aluminum busbar in the up and down directions; under the same thickness of the composite busbar assembly, the series busbar copper busbar is welded to the series busbar aluminum busbar, and the series busbar copper busbar is a copper piece; the conductivity coefficient of the series busbar copper busbar is greater than the conductivity coefficient of the series busbar aluminum busbar, based on the conductivity of the series busbar copper busbar, so as to increase the conductivity effect of the composite busbar assembly by arranging the series busbar copper busbar to meet the overcurrent requirement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solution in the embodiment of the present application, the following description will be made in conjunction with the accompanying drawings. In the following description, the same figure numbers represent the same parts.

[0026] Figure 1 A schematic diagram of a composite busbar assembly according to a first embodiment of the present application is shown.

[0027] Figure 2 A front view of a composite busbar assembly according to a first embodiment of the present application is shown.

[0028] Figure 3 A schematic diagram of series-connected aluminum busbars of a composite busbar assembly according to the first embodiment of the present application is shown.

[0029] Figure 4 A schematic diagram of a series busbar of a composite busbar assembly according to a first embodiment of the present application is shown.

[0030] Figure 5 A schematic diagram of a composite busbar assembly according to a second embodiment of the present application is shown.

[0031] Reference numerals

[0032] 100. Composite busbar assembly;

[0033] 10. Aluminum busbar connected in series; 11. First flat plate portion; 12. Second flat plate portion; 13. Deformed portion; 13a. Arched groove; 13b. First arc groove;

[0034] 20. Series busbar; 20a. Avoidance hole; 21. First arched portion; 22. First arc portion. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0036] Please refer to the attached Figures 1 to 5 An embodiment of the present application provides a composite bus assembly 100, which is applied to a power battery. The composite bus assembly 100 includes a series bus aluminum bus 10 and a series bus copper bus 20, and the series bus copper bus 20 is arranged on the upper side of the series bus aluminum bus 10.

[0037] In the embodiment of the present application, the series bus aluminum bar 10 includes a first flat portion 11, a second flat portion 12 and a deformation portion 13; the first flat portion 11 is used for laser welding to the positive electrode of the first battery cell; the second flat portion 12 is used for laser welding to the negative electrode of the second battery cell; as the first battery cell or the second battery cell expands, the movement of the first flat portion 11 and the second flat portion 12 is affected; the deformation portion 13 is between the first flat portion 11 and the second flat portion 12, the deformation portion 13 connects the first flat portion 11 and the second flat portion 12, and allows the first flat portion 11 and the second flat portion 12 to move and deform.

[0038] At this time, the series bus aluminum bar 10 is composed of a first flat portion 11, a second flat portion 12 and a deformable portion 13. The first flat portion 11 is used for laser welding to the positive electrode of the first battery cell, so that the positive electrode of the first battery cell is fixed to the first flat portion 11, thereby facilitating the positive electrode of the first battery cell and the first flat portion 11 to be energized. The second flat portion 12 is used for laser welding to the negative electrode of the second battery cell, so that the negative electrode of the second battery cell is fixed to the second flat portion 12, thereby facilitating the negative electrode of the second battery cell and the second flat portion 12 to be energized.

[0039] Among them, as the first battery cell or the second battery cell expands, the movement of the first flat plate portion 11 and the second flat plate portion 12 is affected; the deformation portion 13 is located between the first flat plate portion 11 and the second flat plate portion 12, the deformation portion 13 connects the first flat plate portion 11 and the second flat plate portion 12, and allows the first flat plate portion 11 and the second flat plate portion 12 to move and deform, based on the deformation portion 13 to respond to the movement and deformation of the first flat plate portion 11 and the second flat plate portion 12, and adapt to the expansion of the first battery cell or the second battery cell.

[0040] In the embodiment of the present application, the series bus copper bus 20 is arranged on the upper side of the series bus aluminum bus 10, and the series bus copper bus 20 is stacked on the series bus aluminum bus 10 in the up and down direction; under the same thickness of the composite bus assembly, the series bus copper bus 20 is welded to the series bus aluminum bus 10, so that the series bus copper bus 20 is fixed to the series bus aluminum bus 10; the series bus copper bus 20 is a copper part; the conductivity coefficient of the series bus copper bus 20 is greater than the conductivity coefficient of the series bus aluminum bus 10, based on the conductivity of the series bus copper bus 20, so as to increase the conductivity effect of the composite bus assembly 100 by arranging the series bus copper bus 20 to meet the overcurrent requirements.

[0041] The lower side wall of the series bus aluminum bar 10 is welded to the positive electrode of the first battery cell and the negative electrode of the second battery cell, so that the positive electrode of the first battery cell and the negative electrode of the second battery cell are fixed to the lower side wall of the series bus aluminum bar 10; the series bus copper bar 20 is located on the upper side of the series bus aluminum bar 10, and is welded to the series bus aluminum bar 10 by polymer diffusion welding, so that the series bus copper bar 20 is fixed to the series bus aluminum bar 10.

[0042] In the embodiment of the present application, the series bus copper bus 20 is flush with the series bus aluminum bus 10 in the up and down direction; the thickness of the series bus copper bus 20 is equal to or unequal to the thickness of the series bus aluminum bus 10, so that the series bus copper bus 20 overlaps with the series bus aluminum bus 10, thereby facilitating the series bus copper bus 20 and the series bus aluminum bus 10 to conduct electricity, thereby facilitating the improvement of the conductive effect of the composite bus assembly 100.

[0043] The series bus copper bus 20 is provided with an avoidance hole 20a, and the avoidance hole 20a is arranged relative to the welding position between the series bus aluminum bus 10 and the first battery cell or the second battery cell, so that the first battery cell or the second battery cell can be connected to the series bus copper bus 20 and the series bus aluminum bus 10 through the avoidance hole 20a, thereby facilitating the improvement of the conductive effect of the composite bus assembly 100. Optionally, the avoidance hole 20a is a circular hole, a square hole or a special-shaped hole.

[0044] The flatness of the first flat plate portion 11 and the flatness of the second flat plate portion 12 are both less than or equal to 0.1 mm, thereby improving the stability of the composite busbar assembly 100 .

[0045] In the embodiments of the present application, the deformation portion 13 is arranged in an arch shape or a serpentine shape. In the first embodiment, when the deformation portion 13 is arranged in an arch shape, the deformation portion 13 arches toward the side of the series bus aluminum bus 10 that is away from the series bus copper bus 20, so that the series bus aluminum bus 10 is flush with the side of the series bus copper bus 20; the deformation portion 13 is provided with an arch groove 13a; the series bus copper bus 20 is provided with a first arch portion 21, and the first arch portion 21 is adapted to the arch groove 13a, so that the first arch portion 21 is accommodated in the arch groove 13a, and the outer wall of the first arch portion 21 contacts the inner wall of the arch groove 13a, so that the deformation portion 13 can contact the series bus copper bus 20 through the arch groove 13a and the first arch portion 21.

[0046] In the second embodiment, when the deformation portion 13 is arranged in a serpentine shape, the deformation portion 13 arches toward the side of the series bus aluminum bus 10 that is away from the series bus copper bus 20, so that the series bus aluminum bus 10 is flush with the side of the series bus copper bus 20; the deformation portion 13 is provided with a first circular arc groove 13b; the series bus copper bus 20 is provided with a first circular arc portion 22, and the first circular arc portion 22 is adapted to the circular arc groove, so that the first circular arc portion 22 can be accommodated in the first circular arc groove 13b, and the outer side wall of the first circular arc portion 22 is in contact with the inner side wall of the first circular arc groove 13b, so that the deformation portion 13 can contact the series bus copper bus 20 through the first circular arc groove 13b and the first circular arc portion 22.

[0047] In the third embodiment, a power battery includes a composite bus assembly 100, a first battery cell and a second battery cell; the composite bus assembly 100 connects the first battery cell and the second battery cell so as to increase the conductivity of the power battery through the composite bus assembly 100 to meet the overcurrent requirement.

[0048] Compared with the prior art, the beneficial effects of the utility model are:

[0049] The utility model provides a composite busbar assembly 100 and a power battery. The series busbar aluminum bar 10 includes a first flat plate portion 11, a second flat plate portion 12 and a deformable portion 13; the first flat plate portion 11 is used for laser welding to the positive electrode of the first battery cell; the second flat plate portion 12 is used for laser welding to the negative electrode of the second battery cell; the movement of the first flat plate portion 11 and the second flat plate portion 12 is affected as the first battery cell or the second battery cell expands; the deformable portion 13 is between the first flat plate portion 11 and the second flat plate portion 12, the deformable portion 13 connects the first flat plate portion 11 and the second flat plate portion 12, and allows the first flat plate portion 11 and the second flat plate portion 12 to move. The flat plate portion 12 moves and deforms; based on the deformation portion 13 responding to the movement and deformation of the first flat plate portion 11 and the second flat plate portion 12, and adapting to the expansion of the first battery cell or the second battery cell, the series bus copper bus 20 is stacked on the series bus aluminum bus 10 in the up and down direction; the series bus copper bus 20 is welded to the series bus aluminum bus 10; the series bus copper bus 20 is a copper part; the conductivity coefficient of the series bus copper bus 20 is greater than the conductivity coefficient of the series bus aluminum bus 10, based on the conductivity of the series bus copper bus 20, so as to increase the conductivity effect of the composite bus assembly 100 by arranging the series bus copper bus 20 to meet the overcurrent requirements.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite busbar assembly, characterized in that: Applied to a power battery, the composite busbar assembly comprises: A series busbar, comprising a first flat plate portion, a second flat plate portion and a deforming portion; the first flat plate portion is used for laser welding to the positive electrode of the first battery cell; the second flat plate portion is used for laser welding to the negative electrode of the second battery cell; the movement of the first flat plate portion and the second flat plate portion is affected as the first battery cell or the second battery cell expands; the deforming portion is between the first flat plate portion and the second flat plate portion, the deforming portion connects the first flat plate portion and the second flat plate portion, and allows the movement and deformation of the first flat plate portion and the second flat plate portion; The series bus copper bar is stacked on the series bus aluminum bar in the up-down direction; the series bus copper bar is welded to the series bus aluminum bar; the series bus copper bar is a copper piece; the conductivity of the series bus copper bar is greater than the conductivity of the series bus aluminum bar.

2. The composite busbar assembly according to claim 1, characterized in that: The lower side wall of the series busbar aluminum bar is welded to the positive electrode of the first battery cell and the negative electrode of the second battery cell; The series bus copper bar is located on the upper side of the series bus aluminum bar and is welded to the series bus aluminum bar by polymer diffusion welding.

3. The composite busbar assembly according to claim 2, characterized in that: The series bus copper bar is flush with the series bus aluminum bar in the up-down direction; The thickness of the series bus copper bar is equal to or unequal to the thickness of the series bus aluminum bar.

4. The composite busbar assembly according to claim 3, characterized in that: The series bus copper bar is provided with an avoidance hole, and the avoidance hole is arranged relative to the welding position between the series bus aluminum bar and the first battery cell or the second battery cell.

5. The composite busbar assembly according to claim 4, characterized in that: The avoidance hole is a circular hole, a square hole or a special-shaped hole.

6. The composite busbar assembly according to any one of claims 1 to 5, characterized in that: The flatness of the first flat plate portion and the flatness of the second flat plate portion are both less than or equal to 0.1 mm.

7. The composite busbar assembly according to claim 5, characterized in that: The deformation portion is arranged in an arch shape or a serpentine shape.

8. The composite busbar assembly according to claim 1, characterized in that: When the deformation portion is arranged in an arch shape, the deformation portion protrudes in an arch shape toward the side of the series busbar aluminum busbar facing away from the series busbar copper busbar; the deformation portion is provided with an arch groove; The series busbar is provided with a first arched portion, and the first arched portion is adapted to the arched groove.

9. The composite busbar assembly according to claim 8, characterized in that: When the deformation part is arranged in a serpentine shape, the deformation part protrudes in an arch shape toward the side of the series busbar aluminum busbar facing away from the series busbar copper busbar; the deformation part is provided with a first arc groove; The series bus copper bar is provided with a first arc portion, and the first arc portion is adapted to the arc groove.

10. A power battery, characterized in that: It comprises the composite busbar assembly as claimed in any one of claims 1 to 9, a first battery cell and a second battery cell; the composite busbar assembly connects the first battery cell and the second battery cell.

Images