Connecting aluminum bar and battery pack

Abstract

This application provides a connecting aluminum bus and a battery pack, belonging to the field of battery pack technology. The connecting aluminum bus includes: an aluminum bus body; the aluminum bus body is provided with a first welding area, a second welding area, a rigid area, and at least one deformable area; the first welding area and the second welding area are respectively located at both ends of the aluminum bus body, the rigid area is located in the middle of the aluminum bus body, and at least one deformable area is provided between the rigid area and the first welding area, and between the rigid area and the second welding area. In this application, the deformation of the connecting aluminum bus occurs within the plane of the aluminum bus body and does not affect the structures stacked or close to it within the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, and in particular to a connecting aluminum bar and battery pack. Background Technology

[0002] A battery pack is a battery system that combines multiple battery cells in a specific configuration and connection method. This combination can provide higher voltage, capacity, or power output to meet the needs of specific applications. They are widely used in various electronic devices and electric vehicles to ensure the stable and safe operation of these devices.

[0003] Aluminum electrodes are aluminum conductive components used in battery modules to connect series and parallel battery cells. They are mainly used to realize the series and parallel connection of battery cells, current transmission and structural fixation, and are one of the key components of lithium-ion battery modules / packs.

[0004] However, due to the effects of cell expansion force and vibration impact, the aluminum bar will be subjected to tensile and compressive forces, causing the aluminum bar to deform. How to prevent excessive deformation of the aluminum bar from affecting other components is a technical problem that needs to be solved in this field. Utility Model Content

[0005] This application provides a connection between the aluminum bus and the battery pack, which can prevent excessive deformation of the aluminum bus from affecting other components.

[0006] The technical solution is as follows:

[0007] On one hand, a connecting aluminum bar is provided, the connecting aluminum bar comprising: an aluminum bar body;

[0008] The aluminum bar body is provided with a first welding zone, a second welding zone, a rigid zone and at least one deformation zone;

[0009] The first welding area and the second welding area are respectively located at both ends of the aluminum bar body, the rigid area is located in the middle of the aluminum bar body, and the deformation area is provided at at least one position between the rigid area and the first welding area, and between the rigid area and the second welding area.

[0010] In some embodiments, the number of deformation zones is two, with one deformation zone located between the rigid zone and the first welding zone, and another located between the rigid zone and the second welding zone.

[0011] In some embodiments, the first welding area and the second welding area are arranged parallel to and spaced apart from the rigid area.

[0012] In some embodiments, the deformation zone includes a first deformation zone located between the first welding zone and the rigid zone;

[0013] The first deformation zone is connected to the first welding zone and the rigid zone at an angle to each other;

[0014] And / or,

[0015] The deformation zone includes a second deformation zone located between the second welding zone and the rigid zone;

[0016] The second deformation zone is connected at an angle to the second welding zone and the rigid zone, respectively.

[0017] In some embodiments, when the deformation zone includes a first deformation zone, the included angle between the first deformation zone and the first welding zone and the rigid zone ranges from 60 to 90 degrees.

[0018] When the deformation zone includes a second deformation zone, the included angle between the second deformation zone, the second welding zone, and the rigid zone ranges from 60 to 90 degrees.

[0019] In some embodiments, the thickness of the aluminum bar body is T, the dimension of the deformation zone along the thickness direction of the aluminum bar body is H, and the dimension of the rigid zone along the spacing direction between the first welding zone and the second welding zone is L;

[0020] Among them, 0.8≤2H / (LT)≤1.5.

[0021] In some embodiments, the thickness of the aluminum bar body is T, and the dimension of the deformation zone along the thickness direction of the aluminum bar body is H; wherein, 3T≤H≤6T;

[0022] And / or,

[0023] The thickness of the aluminum bar body is T, and the dimension of the rigid zone along the interval between the first welding zone and the second welding zone is L; wherein, 5T≤L≤8T.

[0024] In some embodiments, the rigid region is provided with at least one concave-convex structure, which protrudes toward the side where the first welding area or the second welding area is located, or protrudes away from the side where the first welding area or the second welding area is located.

[0025] In some embodiments, the first welding area and the second welding area are respectively provided with welding positioning holes, which are used to determine the relative position of the aluminum bar body and the battery cell electrode post.

[0026] In some embodiments, the first welding area and the second welding area are respectively provided with mounting positioning holes, which are used for mounting and positioning the aluminum bar body;

[0027] And / or,

[0028] At least one corner of the aluminum bar body is provided with a foolproof notch.

[0029] On the other hand, a battery pack is provided that employs the connecting aluminum bar described in this application.

[0030] The beneficial effects of the technical solution provided in this application include at least the following:

[0031] The connecting aluminum bar of this application is used for series and parallel connection of cells inside the battery pack. It is welded to the terminals of two adjacent cells using the first welding area and the second welding area. Under the action of the cell expansion and extrusion force, it can deform and collapse in the deformation area. The rigid area provides support. The deformation occurs in the plane where the aluminum bar body is located and will not bulge in the direction perpendicular to the plane where the aluminum bar body is located. It will not affect the structures stacked or close to it in the battery pack (such as crossbeams, box covers, etc.) and has virtually no impact on other components of the system, which is beneficial to improving the safety performance of the battery pack. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the connecting aluminum bar provided in an embodiment of this application;

[0034] Figure 2 This is a side view of the connecting aluminum bar structure provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the connection structure between the aluminum battery and the battery cell provided in an embodiment of this application;

[0036] Figure 4 This is a finite element analysis diagram of the connecting aluminum bar provided in the embodiment of this application.

[0037] The reference numerals in the figure are respectively:

[0038] 100. Battery cells;

[0039] 1. Aluminum bar body;

[0040] 11. First welding zone; 111. Welding positioning hole; 112. Mounting positioning hole; 12. Second welding zone; 13. Rigid zone; 131. Concave-convex structure; 14. Deformation zone; 141. First deformation zone; 142. Second deformation zone; 15. Foolproof notch;

[0041] 2. Pole post. Detailed Implementation

[0042] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0043] In the description of this application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] It should be understood that in this application, "electrical connection" can be understood as physical contact and electrical conduction between components; it can also be understood as the form in which different components in a circuit structure are connected through physical lines that can transmit electrical signals, such as copper foil or wires on a printed circuit board (PCB). "Connection" and "connected" can both refer to a mechanical or physical connection relationship. That is, A and B being connected or A and B being connected can mean that there are fastening components (such as screws, bolts, rivets, etc.) between A and B, or that A and B are in contact with each other and are difficult to separate.

[0045] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0047] On the one hand, combined with Figure 1 and Figure 2 As shown, this embodiment provides a connecting aluminum bar, which includes: an aluminum bar body 1, on which a first welding area 11, a second welding area 12, a rigid area 13 and at least one deformable area 14 are provided.

[0048] The first welding area 11 and the second welding area 12 are located at both ends of the aluminum bar body 1, the rigid area 13 is located in the middle of the aluminum bar body 1, and the deformation area 14 is provided at least one position between the rigid area 13 and the first welding area 11, and between the rigid area 13 and the second welding area 12.

[0049] The connecting aluminum bar in this embodiment is used for the series-parallel connection of the battery cells 100 inside the battery pack. It is welded to the pole post 2 of two adjacent battery cells 100 using the first welding area 11 and the second welding area 12. Under the action of the expansion and extrusion force of the battery cells 100, it can deform and collapse in the deformation area 14. The rigid area 13 provides support. The deformation occurs in the plane where the aluminum bar body 1 is located and will not protrude in the direction perpendicular to the plane where the aluminum bar body 1 is located. It will not affect the structures stacked and close to it in the battery pack (such as crossbeams, box covers, etc.) and has virtually no impact on other components of the system, which is beneficial to improving the safety performance of the battery pack.

[0050] In some possible implementations, the aluminum bar body 1 is made of a metal with good electrical conductivity, such as aluminum or copper.

[0051] Combination Figure 1 and Figure 2 As shown, in some embodiments, there are two deformation zones 14, one between the rigid zone 13 and the first welding zone 11, and another between the rigid zone 13 and the second welding zone 12.

[0052] With the above arrangement, the aluminum bar body 1 can absorb the expansion and extrusion pressure of the battery cell 100 using two deformation zones 14. The two deformation zones 14 can evenly distribute the deformation amount and prevent excessive deformation from occurring in a single deformation zone 14.

[0053] Combination Figure 1 and Figure 2 As shown, in some embodiments, the first welding area 11 and the second welding area 12 are arranged parallel to and spaced apart from the rigid area 13.

[0054] With the above arrangement, the first welding area 11, the second welding area 12 and the rigid area 13 have a height difference. On the one hand, this can fit the stacking environment inside the battery pack where the battery cells 100 are arranged adjacently, with the pole post 2 at a higher position and the area between the pole posts 2 at a lower position. On the other hand, the height difference arrangement of the first welding area 11, the second welding area 12 and the rigid area 13 can be folded (or described as Z-shaped) along the height difference position when subjected to the expansion and compression force of the battery cell 100, and will not bulge along the plane where the aluminum bar body 1 is located. This helps to avoid interference between the deformed aluminum bar body 1 and the structure stacked close to it inside the battery pack.

[0055] Combination Figure 1 and Figure 2As shown, in some embodiments, the deformation region 14 includes a first deformation region 141 located between the first welding region 11 and the rigid region 13; the first deformation region 141 is connected to the first welding region 11 and the rigid region 13 at an angle.

[0056] With the above arrangement, when subjected to the expansion and extrusion pressure of the battery cell 100, the first welding area 11 and the rigid area 13 move relative to each other, and the first deformation area 141 can undergo folding (or be described as Z-shaped) deformation to absorb the expansion and extrusion pressure of the battery cell 100 without bulging along the plane where the aluminum bar body 1 is located.

[0057] Combination Figure 1 and Figure 2 As shown, in some embodiments, the deformation region 14 includes a second deformation region 142 located between the second welding region 12 and the rigid region 13; the second deformation region 142 is connected to the second welding region 12 and the rigid region 13 at an angle.

[0058] With the above arrangement, when subjected to the expansion and extrusion pressure of the battery cell 100, the second welding area 12 and the rigid area 13 move relative to each other, and the second deformation area 142 can undergo folding (or be described as Z-shaped) deformation to absorb the expansion and extrusion pressure of the battery cell 100 without bulging along the plane where the aluminum bar body 1 is located.

[0059] In some embodiments, when the deformation region 14 includes a first deformation region 141, the included angle between the first deformation region 141 and the first welding region 11 and the rigid region 13 is in the range of 60-90 degrees; when the deformation region 14 includes a second deformation region 142, the included angle between the second deformation region 142 and the second welding region 12 and the rigid region 13 is in the range of 60-90 degrees.

[0060] When the angles of the first deformation zone 141 and the second deformation zone 142 meet the above-mentioned range, under the action of the expansion and compression force of the battery cell 100, the first deformation zone 141 and the second deformation zone 142 will deform and collapse. The deformation occurs in the plane where the aluminum bar body 1 is located, and will not bulge in a direction perpendicular to the plane where the aluminum bar body 1 is located.

[0061] Combination Figure 2 As shown, in some embodiments, the thickness of the aluminum bar body 1 is T, the dimension of the deformation zone 14 along the thickness direction of the aluminum bar body 1 is H, and the dimension of the rigid zone 13 along the spacing direction between the first welding zone 11 and the second welding zone 12 is L; wherein, 0.8≤2H / (LT)≤1.5.

[0062] When the thickness T of the aluminum bar body 1, the size H of the deformation zone 14 and the size L of the rigid zone 13 meet the above ratio range, the aluminum bar body 1, under the action of the expansion and extrusion force of the battery cell 100, the deformation zone 14 can deform and collapse, the rigid zone 13 can provide support, and the aluminum bar body 1 has good working performance.

[0063] In some possible implementations, the thickness of the aluminum bar body 1 is T, where the value of T ranges from 1 to 3 mm. For example, the values ​​of T are 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.2 mm, 2.4 mm, 2.6 mm, 2.8 mm, and 3 mm.

[0064] Optionally, T can be 2 mm.

[0065] Combination Figure 2 As shown, in some embodiments, the thickness of the aluminum bar body 1 is T, and the dimension of the deformation zone 14 along the thickness direction of the aluminum bar body 1 is H; wherein, 3T≤H≤6T.

[0066] When the thickness T of the aluminum bar body 1 and the size H of the deformation zone 14 meet the above-mentioned ratio range, the aluminum bar body 1, under the action of the expansion and extrusion force of the battery cell 100, the deformation zone 14 can deform and collapse, and the aluminum bar body 1 has good working performance.

[0067] Combination Figure 2 As shown, in some embodiments, the thickness of the aluminum bar body 1 is T, and the dimension of the rigid region 13 along the interval direction between the first welding region 11 and the second welding region 12 is L; wherein, 5T≤L≤8T.

[0068] When the thickness T and H of the aluminum bar body 1 and the size L of the rigid zone 13 meet the above ratio range, the rigid zone 13 can provide support under the expansion and extrusion force of the battery cell 100, and the aluminum bar body 1 has good working performance.

[0069] Combination Figure 1 and Figure 2 As shown, in some embodiments, the rigid region 13 is provided with at least one concave-convex structure 131, which protrudes toward the side where the first welding region 11 or the second welding region 12 is located, or protrudes away from the side where the first welding region 11 or the second welding region 12 is located.

[0070] To further improve the rigidity of the rigid region 13, at least one concave-convex structure 131 is arranged in the rigid region 13. By improving the rigidity of the rigid region 13, the rigid support effect of the aluminum bar body 1 is ensured.

[0071] In some possible implementations, the concave-convex structure 131 supports the stamping process, and the shape of the concave-convex structure 131 includes, but is not limited to, semi-circular, trapezoidal, arc, square, wavy, etc.

[0072] For example, the concave-convex structure 131 is a groove structure that penetrates the rigid region 13. The groove structure is located on the central symmetry line of the rigid region 13, and the groove structure protrudes toward the side where the first welding region 11 or the second welding region 12 is located.

[0073] The above arrangement not only ensures that the surface of the rigid area 13 facing away from the first welding area 11 or the second welding area 12 is flat, but also ensures that when the aluminum bar body 1 is subjected to the expansion and extrusion force of the battery cell 100, the concave-convex structure 131 can generate a rigid support force towards the side where the first welding area 11 or the second welding area 12 is located, preventing the rigid structure from bulging out towards the side where the first welding area 11 or the second welding area 12 is located after failure.

[0074] Combination Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the first welding area 11 and the second welding area 12 are respectively provided with welding positioning holes 111, which are used to determine the relative positions of the aluminum bar body 1 and the battery cell 100 pole post 2.

[0075] With the above arrangement, the aluminum bar body 1 can be positioned with the electrode post 2 of the battery cell 100 to be welded using the welding positioning hole 111. The positioning is simple, which helps to improve the installation efficiency of the aluminum bar body 1, and can also ensure the welding accuracy and reliability between the aluminum bar body 1 and the battery cell 100.

[0076] Combination Figure 1 and Figure 2 As shown, in some embodiments, the first welding area 11 and the second welding area 12 are respectively provided with mounting positioning holes 112, which are used for mounting and positioning the aluminum bar body 1.

[0077] With the above arrangement, the aluminum bar body 1 can be positioned using the mounting positioning hole 112, which is simple and helps to improve the installation efficiency of the aluminum bar body 1.

[0078] Combination Figure 1 and Figure 2 As shown, in some embodiments, at least one corner of the aluminum bar body 1 is provided with a foolproof notch 15.

[0079] The aforementioned foolproof notch 15 allows for easy identification of the installation direction of the aluminum bar body 1, reducing identification time and improving the installation efficiency and accuracy of the aluminum bar body 1.

[0080] Figure 4This is a finite element analysis diagram of the connecting aluminum bar provided in this embodiment. It can be seen that the static maximum value of the connecting aluminum bar provided in this embodiment is 1.696. Under the expansive force of the battery cell 100, the deformation zone 14 of the connecting aluminum bar can deform and collapse, and the rigid zone 13 can provide support. The connecting aluminum bar has good anti-extrusion and deformation buffer performance.

[0081] On the other hand, combining Figure 3 As shown in the figure, this application embodiment provides a battery pack, which adopts the connecting aluminum bar of this application.

[0082] The battery pack in this embodiment uses the connecting aluminum bar of this application, and has all the beneficial technical effects of all embodiments of this application.

[0083] Among some possible implementations, refer to Figure 3 As shown, the battery pack also includes at least two cells 100, each of which has a terminal post 2 on its top. Each cell 100 has two terminals 2, corresponding to the positive and negative terminals respectively.

[0084] The connecting aluminum bar is located between two adjacent battery cells 100. The first welding area 11 is welded to the terminal post 2 of one of the battery cells 100 (e.g., the terminal post 2 corresponding to the negative electrode), and the second welding area 12 is welded to the terminal post 2 of the other battery cell 100 (e.g., the terminal post 2 corresponding to the negative electrode). The rigid area 13 is located between the two terminal posts 2.

[0085] With the above arrangement, the corresponding negative terminals 2 on two adjacent cells 100 are electrically connected using connecting aluminum bars. It should be noted that the connecting aluminum bars can also be used to electrically connect the corresponding positive terminals 2 on two adjacent cells 100.

[0086] It should be noted that in this article, "several" and "at least one" refer to one or more, while "multiple" and "at least two" refer to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0088] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0089] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this application.

[0090] The above description is merely an embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A connecting aluminum bar, characterized in that, The connecting aluminum bar includes: an aluminum bar body (1); The aluminum body (1) is provided with a first welding area (11), a second welding area (12), a rigid area (13) and at least one deformable area (14); The first welding area (11) and the second welding area (12) are located at both ends of the aluminum bar body (1), the rigid area (13) is located in the middle of the aluminum bar body (1), and the deformation area (14) is provided at at least one position between the rigid area (13) and the first welding area (11), and between the rigid area (13) and the second welding area (12).

2. The connecting aluminum bar according to claim 1, characterized in that, There are two deformation zones (14), one between the rigid zone (13) and the first welding zone (11), and one between the rigid zone (13) and the second welding zone (12).

3. The connecting aluminum bar according to claim 1, characterized in that, The first welding area (11) and the second welding area (12) are arranged parallel to and spaced apart from the rigid area (13).

4. The connecting aluminum bar according to claim 3, characterized in that, The deformation zone (14) includes a first deformation zone (141) located between the first welding zone (11) and the rigid zone (13); the first deformation zone (141) is connected to the first welding zone (11) and the rigid zone (13) at an angle. And / or, The deformation zone (14) includes a second deformation zone (142) located between the second welding zone (12) and the rigid zone (13); the second deformation zone (142) is connected to the second welding zone (12) and the rigid zone (13) at an angle.

5. The connecting aluminum bar according to claim 4, characterized in that, When the deformation zone (14) includes the first deformation zone (141), the included angle between the first deformation zone (141) and the first welding zone (11) and the rigid zone (13) ranges from 60 to 90 degrees. When the deformation zone (14) includes the second deformation zone (142), the included angle between the second deformation zone (142) and the second welding zone (12) and the rigid zone (13) ranges from 60 to 90 degrees.

6. The connecting aluminum bar according to claim 4, characterized in that, The thickness of the aluminum bar body (1) is T, the dimension of the deformation zone (14) along the thickness direction of the aluminum bar body (1) is H, and the dimension of the rigid zone (13) along the spacing direction between the first welding zone (11) and the second welding zone (12) is L. Among them, 0.8≤2H / (LT)≤1.

5.

7. The connecting aluminum bar according to claim 4, characterized in that, The thickness of the aluminum bar body (1) is T, and the dimension of the deformation zone (14) along the thickness direction of the aluminum bar body (1) is H; wherein, 3T≤H≤6T; And / or, The thickness of the aluminum bar body (1) is T, and the dimension of the rigid area (13) along the interval direction between the first welding area (11) and the second welding area (12) is L; wherein, 5T≤L≤8T.

8. The connecting aluminum bar according to any one of claims 1 to 7, characterized in that, The rigid area (13) is provided with at least one concave-convex structure (131), which protrudes toward the side where the first welding area (11) or the second welding area (12) is located, or protrudes away from the side where the first welding area (11) or the second welding area (12) is located.

9. The connecting aluminum bar according to any one of claims 1 to 7, characterized in that, The first welding area (11) and the second welding area (12) are respectively provided with welding positioning holes (111), which are used to determine the relative position of the aluminum bar body (1) and the battery cell (200) electrode post (2).

10. The connecting aluminum bar according to any one of claims 1 to 7, characterized in that, The first welding area (11) and the second welding area (12) are respectively provided with mounting positioning holes (112), which are used for mounting and positioning of the aluminum bar body (1); And / or, At least one corner of the aluminum bar body (1) is provided with a foolproof notch (15).

11. A battery pack, characterized in that, The battery pack uses the connecting aluminum bar as described in any one of claims 1 to 10.

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