Busbar, battery unit, battery pack and new energy automobile

Abstract

The embodiment of the utility model provides a busbar, a battery unit, a battery pack and a new energy automobile, and relates to the technical field of power batteries. The busbar comprises an aluminum sheet and a copper sheet, the copper sheet is arranged on the aluminum sheet, and a welding avoiding hole is formed in the copper sheet, so that a part of the aluminum sheet is exposed, and the part of the aluminum sheet is welded with a pole of the battery cell through the welding avoiding hole. According to the busbar, the thickness and the welding difficulty can be reduced, welding is facilitated, and the production and manufacturing cost can also be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a bus bar, a battery unit, a battery pack and a new energy vehicle. Background Art

[0002] With the rapid development of new energy vehicles, the development of power batteries, which are the power source of new energy vehicles, is also getting faster and faster, and the requirements for fast charging current of new energy battery packs are also getting higher and higher. At present, the way to increase the fast charging current is usually to increase the thickness of the module busbar, or change the busbar material to copper or nickel metal with better conductivity.

[0003] However, increasing the busbar thickness will make welding difficult, and changing the material will not only increase the difficulty of welding, but also significantly increase the cost. Utility Model Content

[0004] The purpose of the utility model is to provide a busbar, a battery unit, a battery pack and a new energy vehicle, which can reduce the thickness and welding difficulty of the busbar, facilitate welding, and reduce the cost of production.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In a first aspect, the utility model provides a bus bar, comprising:

[0007] Aluminum sheets; and

[0008] The copper sheet is arranged on the aluminum sheet, and a welding avoidance hole is opened on the copper sheet to expose a part of the aluminum sheet and is used to weld a part of the aluminum sheet to the pole of the battery cell through the welding avoidance hole.

[0009] In an optional embodiment, the number of the welding avoidance holes is two, and the two welding avoidance holes are arranged at intervals; the aluminum sheet has a first welding portion and a second welding portion, the first welding portion and the second welding portion are respectively arranged in the two welding avoidance holes, and the first welding portion and the second welding portion are used to respectively weld to the poles of two adjacent battery cells.

[0010] In an optional embodiment, a portion of the aluminum sheet extends toward the copper sheet to form a first bent portion, and the first bent portion is located between the first welding portion and the second welding portion;

[0011] A portion of the copper sheet extends in a direction away from the aluminum sheet to form a second bent portion, the second bent portion is located between the two welding avoidance holes, the second bent portion is arranged corresponding to the first bent portion, and is welded to the first bent portion.

[0012] In an optional embodiment, the aluminum sheet includes a plurality of aluminum sheets, the copper sheet includes a plurality of copper sheets, and the plurality of copper sheets and the plurality of aluminum sheets are stacked and welded in sequence along a thickness direction of the busbar.

[0013] In an optional implementation, the thickness of the aluminum sheet ranges from 0.1 mm to 0.5 mm, and the thickness of the copper sheet ranges from 0.1 mm to 0.5 mm.

[0014] In an optional embodiment, the thickness of the copper sheet is greater than the thickness of the aluminum sheet.

[0015] In an optional embodiment, the aluminum sheet is provided with a positioning hole, and the positioning hole is connected to the welding avoidance hole.

[0016] In a second aspect, the utility model provides a battery unit, comprising a battery cell and the busbar described in any one of the aforementioned embodiments, wherein the pole of the battery cell is welded to the aluminum sheet.

[0017] In a third aspect, the utility model provides a battery pack, comprising a battery shell and the battery unit described in the aforementioned embodiment, wherein the battery unit is disposed in the battery shell.

[0018] In a fourth aspect, the utility model provides a new energy vehicle, comprising the battery pack described in the aforementioned embodiment.

[0019] The beneficial effects of the embodiments of the utility model include:

[0020] The busbar includes an aluminum sheet and a copper sheet. The copper sheet is arranged on the aluminum sheet, and a welding avoidance hole is opened on the copper sheet to expose a part of the aluminum sheet, and is used to weld a part of the aluminum sheet to the pole of the battery cell through the welding avoidance hole. Since copper has better thermal conductivity than aluminum, but copper is not easy to weld with the aluminum pole of the battery cell, the aluminum sheet located under the copper sheet is welded with the pole of the battery cell, making welding more convenient and quick, thereby compatibility with the overcurrent capacity and welding capacity; at the same time, by opening the welding avoidance hole, part of the copper layer can be cut, so that the aluminum sheet can be welded with the pole of the battery cell through the welding avoidance hole, which reduces the overall thickness of the busbar to a certain extent, and avoids the copper layer that is difficult to weld, and only welds the aluminum layer, thereby greatly reducing the welding difficulty without reducing the current carrying capacity; in addition, the busbar made of aluminum and copper materials also reduces the cost compared to the metals made of precious materials such as nickel. Therefore, the busbar can reduce the thickness and welding difficulty, facilitate welding, and reduce the cost of production.

[0021] The battery unit comprises a battery cell and a busbar, wherein the pole of the battery cell is welded to the aluminum sheet, and the battery unit has all the beneficial effects of the busbar.

[0022] The battery pack comprises a battery case and a battery cell, wherein the battery cell is arranged in the battery case, and the battery pack has all the beneficial effects of the battery cell.

[0023] The new energy vehicle includes the battery pack and has all the beneficial effects of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of the structure of a new energy vehicle provided by an embodiment of the utility model;

[0026] Figure 2 A schematic structural diagram of a battery unit provided by an embodiment of the utility model from a first perspective;

[0027] Figure 3 A schematic structural diagram of a busbar provided by an embodiment of the utility model from a first perspective;

[0028] Figure 4 A schematic structural diagram of a battery unit from a second viewing angle provided by an embodiment of the utility model;

[0029] Figure 5 A schematic structural diagram of a busbar provided by an embodiment of the utility model from a second viewing angle;

[0030] Figure 6 A partial structural schematic diagram of a bus provided in an embodiment of the utility model.

[0031] Icon: 1000-new energy vehicle; 1100-battery pack; 110-battery unit; 100-bus; 10-aluminum sheet; 11-first welding part; 12-second welding part; 13-first bending part; 14-aluminum sheet; 15-positioning hole; 20-copper sheet; 21-welding avoidance hole; 22-second bending part; 23-copper sheet; 200-battery cell; 210-pole; 1200-vehicle body. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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.

[0038] As described in the background technology, with the rapid development of new energy vehicles, the development of power batteries as the power source of new energy vehicles is also getting faster and faster, and the requirements for fast charging current of new energy battery packs are also getting higher and higher. At present, the way to increase the fast charging current is usually to increase the thickness of the module bus, or to change the bus material to copper or nickel metal with better conductivity. However, the increase in bus thickness will cause welding difficulties, and changing the material will not only increase the difficulty of welding, but also greatly increase the cost.

[0039] Based on this, please refer to Figure 1-Figure 6 The embodiment of the utility model provides a busbar 100, a battery cell 110, a battery pack 1100 and a new energy vehicle 1000, which can effectively improve the above-mentioned technical problems, that is, it can reduce the thickness and welding difficulty of the busbar 100, facilitate welding, and also reduce the cost of production. The busbar 100, the battery cell 110, the battery pack 1100 and the new energy vehicle 1000 will be described in detail below.

[0040] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the new energy vehicle 1000 provided in this embodiment is combined with Figure 1 The new energy vehicle 1000 includes a battery pack 1100 and a vehicle body 1200 . The battery pack 1100 is installed on the vehicle body 1200 , thereby providing electric energy for the vehicle body 1200 to realize various functions of the vehicle body 1200 .

[0041] Specifically, the battery pack 1100 includes a battery shell (not shown) and a battery cell 110. The battery cell 110 is disposed in the battery shell. The battery cell 110 serves as a power source for the battery pack 1100, thereby providing electrical energy to the vehicle body 1200 to realize various functions.

[0042] It is easy for those skilled in the art to know that the battery pack 1100 also includes other components such as a battery management system, various battery fixing structures and wiring harnesses, which are not described in detail in this embodiment.

[0043] Please refer to Figure 2 , Figure 2 A schematic diagram of the structure of the battery unit 110 provided in the present embodiment from a first perspective, combined with Figure 2 The battery unit 110 includes a battery cell 200 and a bus bar 100 . The poles 210 of the battery cell 200 are welded to the bus bar 100 , thereby realizing series-parallel connection of a plurality of battery cells 200 .

[0044] Please refer to Figure 3 , Figure 3 A schematic diagram of the structure of the bus 100 provided in the present embodiment from a first perspective, combined with Figure 2 and Figure 3 The busbar 100 includes an aluminum sheet 10 and a copper sheet 20. The copper sheet 20 is arranged on the aluminum sheet 10, and a welding avoidance hole 21 is opened on the copper sheet 20 to expose a portion of the aluminum sheet 10 and is used to weld a portion of the aluminum sheet 10 to the pole 210 of the battery cell 200 through the welding avoidance hole 21.

[0045] Since copper has better thermal conductivity than aluminum, but copper is not easy to weld with the aluminum pole of the battery cell, the aluminum sheet 10 located at the lower layer of the copper sheet 20 is welded with the pole 210 of the battery cell 200, making welding more convenient and quick, thereby compatibility with the flow capacity and welding capacity; at the same time, by opening the welding avoidance hole 21, part of the copper layer can be cut, so that the aluminum sheet 10 can be welded with the pole 210 of the battery cell 200 through the welding avoidance hole 21, which reduces the overall thickness of the busbar 100 to a certain extent, and avoids the copper layer that is difficult to weld, and only welds the aluminum layer, thereby greatly reducing the welding difficulty without reducing the current carrying capacity; in addition, the busbar 100 made of aluminum and copper has a lower cost than that made of precious metals such as nickel. Therefore, the busbar 100 can reduce the thickness and welding difficulty, facilitate welding, and reduce the cost of production.

[0046] Furthermore, in order to facilitate the positioning of the aluminum sheet 10 and the pole 210 during the welding process, in this embodiment, the aluminum sheet 10 is provided with a positioning hole 15, and the positioning hole 15 is connected to the welding avoidance hole 21. It is easy to understand that after the positioning hole 15 is positioned and matched with the pole 210 of the battery cell 200, the aluminum sheet 10 and the pole 210 are welded, thereby improving the welding efficiency.

[0047] like Figure 2 As shown, it should be noted that, in this embodiment, the number of the battery cells 200 is two, and the busbar 100 is used to connect the two battery cells 200 in series, that is, the positive electrode column 210 of one battery cell 200 can be connected in series with the negative electrode column 210 of another battery cell 200 through the busbar 100. Figure 3 As shown, specifically, the number of the welding avoidance holes 21 is two, and the two welding avoidance holes 21 are arranged at intervals; the aluminum sheet 10 has a first welding portion 11 and a second welding portion 12, the first welding portion 11 and the second welding portion 12 are respectively arranged in the two welding avoidance holes 21, and the first welding portion 11 and the second welding portion 12 are used to respectively weld with the poles 210 of two adjacent battery cells 200.

[0048] That is to say, in this embodiment, there are a positive and a negative electrode 210 on the same side of the two battery cells 200, the first welding portion 11 is welded to the positive electrode 210 of one battery cell 200 through a welding avoidance hole 21, and the second welding portion 12 is welded to the negative electrode 210 of another adjacent battery cell 200 through another welding avoidance hole 21, thereby realizing the series connection of two adjacent battery cells 200.

[0049] Of course, in other embodiments, if the same side of the two battery cells 200 are both negative poles, then the two battery cells 200 can be connected in parallel by welding the first welding portion 11 and the second welding portion 12 to the two negative poles respectively.

[0050] In addition, it should be noted that in some other embodiments, if the number of battery cells 200 is three or greater than three, the busbar 100 may also correspondingly open three or greater than three welding avoidance holes 21 to achieve parallel connection of multiple battery cells 200 .

[0051] Please refer to Figure 4 , Figure 4 A schematic diagram of the structure of the battery unit 110 provided in the present embodiment from a second perspective, combined with Figure 3 and Figure 4 In the actual process of assembling the battery unit 110, it is easy for different battery cells 200 to have inconsistent heights. In this case, there is a gap between the pole 210 of the battery cell 200 and the busbar 100, which leads to the problem of cold welding. Therefore, in order to deal with this situation, in this embodiment, a part of the aluminum sheet 10 extends toward the direction of the copper sheet 20 to form a first bend 13, and the first bend 13 is located between the first welding part 11 and the second welding part 12; a part of the copper sheet 20 extends away from the aluminum sheet 10 to form a second bend 22, and the second bend 22 is located between the two welding avoidance holes 21. The second bend 22 is arranged corresponding to the first bend 13 and is welded to the first bend 13.

[0052] like Figure 4 As shown, it is easy to understand that since the first bend 13 and the second bend 22 have a large flexible area, when multiple battery cells 200 are unevenly stacked, the bus 100 can be easily pressed down and welded to the pole 210 of the battery cell 200 through compensation of the flexible area, thereby realizing welding of the battery cells 200 at different levels and improving welding effect and welding efficiency.

[0053] It should be noted that, in the busbar 100 provided in this embodiment, the main function of the aluminum sheet 10 is to facilitate welding with the pole 210 of the battery cell 200, thereby avoiding the copper sheet 20 which is difficult to weld with the pole 210, and the main function of the copper sheet 20 is to carry current. Therefore, in order to further improve the current carrying capacity of the busbar 100, please refer to Figure 5 , Figure 5 A schematic diagram of the structure of the bus 100 provided in this embodiment from a second perspective, combined with Figure 5 In this embodiment, the thickness B of the copper sheet 20 is greater than the thickness A of the aluminum sheet 10 , so that the thickness B of the copper sheet 20 is increased without changing the original thickness of the busbar 100 as a whole to improve its current carrying capacity.

[0054] Of course, in other embodiments, the thickness B of the copper sheet 20 may also be equal to or less than the thickness A of the aluminum sheet 10 , and the specific thicknesses of the two need to be determined based on the actual design requirements of the bus 100 and the battery pack 1100 .

[0055] In order to further improve the flexibility of the busbar 100 and more easily press the busbar 100 down to weld it with the pole 210 of the battery cell 200, please refer to Figure 6 , Figure 6 A schematic diagram of a portion of the structure of the bus 100 provided in this embodiment, combined with Figure 6 The aluminum sheet 10 includes a plurality of aluminum sheets 14, and the copper sheet 20 includes a plurality of copper sheets 23. The plurality of copper sheets 23 and the plurality of aluminum sheets 14 are stacked and welded in sequence along the thickness direction of the busbar 100. By configuring the plurality of aluminum sheets 14 and the plurality of copper sheets 23, the flexibility can be further improved, while the overall thickness of the busbar 100 can be reduced to a certain extent.

[0056] It should be noted that the multiple copper sheets 23 and the multiple aluminum sheets 14 are stacked in sequence and then welded together, which can be achieved specifically by diffusion welding technology, so that the copper-aluminum sheets 14 are welded into a busbar 100 .

[0057] Further, in this embodiment, the thickness of the aluminum sheet 14 ranges from 0.1 mm to 0.5 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.; the thickness of the copper sheet 23 ranges from 0.1 mm to 0.5 mm, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.; within this range, diffusion welding can better weld them. Of course, in some other embodiments, the thickness of the aluminum sheet 14 and the copper sheet 23 can also be other values, which need to be determined according to the actual design requirements of the busbar 100 or the battery cell 110.

[0058] In summary, an embodiment of the utility model provides a busbar 100, a battery cell 110, a battery pack 1100 and a new energy vehicle 1000. The busbar 100 includes an aluminum sheet 10 and a copper sheet 20. The copper sheet 20 is arranged on the aluminum sheet 10, and a welding avoidance hole 21 is opened on the copper sheet 20 to expose a portion of the aluminum sheet 10, and is used to weld a portion of the aluminum sheet 10 to the pole 210 of the battery cell 200 through the welding avoidance hole 21. Since copper has better thermal conductivity than aluminum, but copper is not easy to weld to the aluminum pole of the battery cell, the aluminum sheet 10 located at the lower layer of the copper sheet 20 is welded to the pole 210 of the battery cell 200, making welding more convenient and quick, thereby compatibility with current carrying capacity and welding capacity; at the same time, by opening a welding avoidance hole 21, part of the copper layer can be cut, so that the aluminum sheet 10 can be welded to the pole 210 of the battery cell 200 through the welding avoidance hole 21, which reduces the overall thickness of the bus 100 to a certain extent, avoids the copper layer that is difficult to weld, and only welds the aluminum layer, thereby greatly reducing the welding difficulty without reducing the current carrying capacity; in addition, the bus 100 made of aluminum and copper also reduces costs compared to metals made of precious materials such as nickel.

[0059] Therefore, the busbar 100 can reduce thickness and welding difficulty, facilitate welding, and also reduce production costs.

[0060] The battery unit 110 includes a battery cell 200 and a busbar 100 . The pole 210 of the battery cell 200 is welded to the aluminum sheet 10 . The battery unit 110 has all the functions and beneficial effects of the busbar 100 .

[0061] The battery pack 1100 includes a battery case and a battery cell 110 . The battery cell 110 is disposed in the battery case. The battery pack 1100 has all the functions and beneficial effects of the battery cell 110 .

[0062] The new energy vehicle 1000 includes the battery pack 1100 , which has all the functions and beneficial effects of the battery pack 1100 .

[0063] The above description is only a specific embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A busbar, characterized in that: include: Aluminum sheet (10); as well as A copper sheet (20), the copper sheet (20) being arranged on the aluminum sheet (10), and a welding avoidance hole (21) being opened on the copper sheet (20) so as to expose a portion of the aluminum sheet (10) and being used for welding a portion of the aluminum sheet (10) to a pole (210) of a battery cell (200) through the welding avoidance hole (21).

2. The busbar according to claim 1, characterized in that: The number of the welding avoidance holes (21) is two, and the two welding avoidance holes (21) are arranged at intervals; the aluminum sheet (10) has a first welding portion (11) and a second welding portion (12), the first welding portion (11) and the second welding portion (12) are respectively arranged in the two welding avoidance holes (21), and the first welding portion (11) and the second welding portion (12) are used to be respectively welded to the poles (210) of two adjacent battery cells (200).

3. The busbar according to claim 2, characterized in that: A portion of the aluminum sheet (10) extends toward the copper sheet (20) to form a first bent portion (13), wherein the first bent portion (13) is located between the first welding portion (11) and the second welding portion (12); A portion of the copper sheet (20) extends in a direction away from the aluminum sheet (10) to form a second bent portion (22), the second bent portion (22) being located between the two welding avoidance holes (21), the second bent portion (22) being arranged corresponding to the first bent portion (13), and being welded to the first bent portion (13).

4. The busbar according to claim 1, characterized in that: The aluminum sheet (10) comprises a plurality of aluminum thin sheets (14), and the copper sheet (20) comprises a plurality of copper thin sheets (23). The plurality of copper thin sheets (23) and the plurality of aluminum thin sheets (14) are stacked and welded in sequence along the thickness direction of the busbar (100).

5. The busbar according to claim 4, characterized in that: The thickness of the aluminum sheet (14) ranges from 0.1 mm to 0.5 mm, and the thickness of the copper sheet (23) ranges from 0.1 mm to 0.5 mm.

6. The busbar according to claim 1, characterized in that: The thickness of the copper sheet (20) is greater than the thickness of the aluminum sheet (10).

7. The busbar according to claim 1, characterized in that: The aluminum sheet (10) is provided with a positioning hole (15), and the positioning hole (15) is communicated with the welding avoidance hole (21).

8. A battery cell, characterized in that: It comprises a battery cell (200) and a busbar (100) as claimed in any one of claims 1 to 7, wherein a pole (210) of the battery cell (200) is welded to the aluminum sheet (10).

9. A battery pack, characterized in that: It comprises a battery case and the battery unit (110) according to claim 8, wherein the battery unit (110) is arranged in the battery case.

10. A new energy vehicle, characterized in that: Includes the battery pack (1100) as claimed in claim 9.

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