Battery aluminum bar, battery module and energy storage battery box

Abstract

The utility model relates to the technical field of batteries, in particular to a battery aluminum bar, a battery module and an energy storage battery box, the battery aluminum bar comprises a deformation section and connecting sections located at the two ends of the deformation section, and the deformation section and the connecting sections are of an integrally formed structure; wherein the deformation section is of a flexible structure, and the connecting section is of a rigid structure. The utility model mainly aims to provide a battery aluminum bar which is used for buffering the expansion distance when a battery module is charged by additionally arranging a deformation section.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery aluminum bar, a battery module and an energy storage battery box. Background Art

[0002] In related technologies, air-cooled energy storage battery boxes generally achieve heat dissipation by installing fans on the battery box shell, installing heat dissipation air plates between batteries, and installing refrigeration equipment and air ducts on the battery system. During the operation of the battery module, the fan can only take away the heat from the contact part between the heat dissipation air plate and the battery cell, and the remaining heat is dissipated through the rest of the battery surface and the aluminum bar.

[0003] As the air-cooled energy storage battery box's charge and discharge cycle life is improved from the original 8,000 times to 12,000 times, the corresponding expansion coefficient of the battery itself also increases. During each charge and discharge process, the battery will generate expansion force due to chemical reactions. This expansion force will cause the distance between two adjacent battery cells to change, thereby affecting the welding stability between the aluminum bar and the battery tab. Among them, as the number of charge and discharge times increases, under the influence of this expansion force, the aluminum bar is constantly pulled and deformed, which can easily lead to disconnection between the aluminum bar and the battery tab, reducing the heat dissipation performance of the air-cooled energy storage battery box, and even causing failure of the energy storage battery module. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery aluminum bar, which aims to buffer the expansion distance of the battery module during charging by adding a deformation section.

[0005] To achieve the above-mentioned purpose, the battery aluminum bar proposed in the present invention includes a deformation section and connecting sections located at both ends of the deformation section, wherein the deformation section and the connecting section are an integrally formed structure;

[0006] Wherein, the deformation section is a flexible structure, and the connecting section is a rigid structure.

[0007] In an embodiment of the present invention, the deformation section is extended along a direction from one connecting section to another connecting section.

[0008] In one embodiment of the present invention, the deformation section includes a plurality of undulating portions connected in sequence, and a first rounded corner portion is provided on the top of each undulating portion.

[0009] In one embodiment of the present invention, a second rounded corner portion is provided between any two adjacent undulating portions.

[0010] In one embodiment of the present invention, the deformation section is wavy in shape.

[0011] In one embodiment of the present invention, the lowest end of the deformation section is higher than or level with the connection surface of the connection section;

[0012] Wherein, the connecting surface of the connecting segment is used to connect the battery cell tab.

[0013] In one embodiment of the present invention, each of the connecting sections is provided with a positioning hole, and the positioning hole is used to align the battery cell tab.

[0014] In an embodiment of the present invention, each of the connecting segments is provided with a rounded arc edge, and each of the rounded arc edge is located at an end of the connecting segment away from the deformation segment.

[0015] The present invention proposes a battery module, which includes a plurality of battery cells and a plurality of battery aluminum bars. An expansion gap is provided between any two adjacent battery cells. The deformation section is arranged to correspond to the expansion gap, and the connecting section connects and shields the tabs of the battery cells.

[0016] The present invention provides an energy storage battery box, which includes a casing and the battery module, wherein the battery module is fixed to the casing.

[0017] In the present technical solution, the battery aluminum bar is used to connect the battery module. The connecting section of the battery aluminum bar is a rigid structure, which connects the battery cell tabs in the battery module. In this way, when the battery cells of the battery module expand, the deformation section of the flexible structure undergoes corresponding deformation, stretching or shortening, and adapts to the expansion and contraction between the two battery cells. At the same time, the connecting section of the rigid structure will not deform, thereby not affecting the welding stability between the battery aluminum bar and the battery module. In this way, while ensuring the heat dissipation performance, the expansion distance of the battery module during charging can be buffered by the deformation section, avoiding disconnection and instability between the battery aluminum bar and the battery tabs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a three-dimensional schematic diagram of an embodiment of the battery aluminum bar proposed by the present invention;

[0020] Figure 2 This is a front view of an embodiment of the battery aluminum bar proposed by the present invention;

[0021] Figure 3This is a structural schematic diagram of another perspective of an embodiment of the battery aluminum bar proposed by the present invention;

[0022] Figure 4 This is a three-dimensional structural diagram of an embodiment of the battery module proposed by the present invention.

[0023] Description of Figure Numbers:

[0024] 10. Deformation section; 100. Undulating portion; 101. First rounded corner portion; 102. Second rounded corner portion; 20. Connecting section; 20a. Connecting surface; 20b. Positioning hole; 20c. Rounded arc edge; 30. Battery cell.

[0025] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0029] The battery aluminum bar proposed in this utility model can be found in Figure 1, which includes a deformation section 10 and connecting sections 20 located at both ends of the deformation section 10, and the deformation section 10 and the connecting section 20 are an integrally formed structure;

[0030] The deformation section 10 is a flexible structure, and the connection section 20 is a rigid structure.

[0031] In the present technical solution, the battery aluminum bar is used to connect the battery module. The connecting section 20 of the battery aluminum bar is a rigid structure, which connects the battery cells 30 in the battery module. In this way, when the battery cells 30 of the battery module expand, the deformation section 10 of the flexible structure undergoes corresponding deformation, stretching or shortening, and adapts to the expansion and contraction between the two battery cells 30. At the same time, the connecting section 20 of the rigid structure will not deform, thereby not affecting the welding stability between the battery aluminum bar and the battery module. In this way, while ensuring the heat dissipation performance, the expansion distance of the battery module during charging can be buffered by the deformation section 10 to avoid disconnection and instability between the battery aluminum bar and the battery tab.

[0032] The battery aluminum bar is used to connect the tabs of the battery cells 30 to achieve a series-parallel arrangement between the battery cells 30, wherein the connecting section 20 of the battery aluminum bar is fixedly connected to the tabs of the battery cells 30 by a welding process, and the deformable section 10 of the battery aluminum bar has multiple corners. In one embodiment, the deformable section 10 includes a plurality of conical undulations 100 connected in sequence, thereby forming a folded corner that can be stretched and shortened. In another embodiment, the deformable section 10 includes a plurality of corrugated undulations 100 connected in sequence, thereby forming a bent corner that can be stretched and shortened. Of course, it is not limited that the deformable section 10 may also include conical undulations 100 and corrugated undulations 100 connected in sequence. In this way, when the battery module using the battery aluminum bar is in a charging and discharging state, the battery aluminum bar that can be stretched and shortened can adapt to the expansion distance generated between any two adjacent batteries, thereby preventing the problem of welding disconnection between the connecting section 20 and the battery tab. In this way, the deformation of the battery aluminum bar It only appears in the deformation section 10, and there will be no deformation between the connecting section 20 and the battery tab, which will cause disconnection between the connecting section 20 and the battery tab. Specifically, the connecting section 20 is composed of a composite of aluminum and copper elements, and is hardened by heat treatment to improve its mechanical hardness. Among them, the connecting surface part of the connecting section 20 used for welding to the tab is only composed of aluminum elements, thereby avoiding chemical reactions caused by the copper-aluminum welding contact during the process of welding the connecting section 20 to the tab. The deformation section 10 is also composed of a composite of aluminum and copper elements, and is heated and slowly cooled to make the deformation section 10 have good ductility and formability. It can be further concluded that the battery aluminum bar has more heat dissipation area under the same total length by setting the deformation section 10. With the improvement of heat dissipation performance, the current-carrying area of ​​the battery aluminum bar can be reduced, that is, the thickness (height) or width of the battery aluminum bar can be reduced, thereby reducing material costs. Furthermore, when the thickness of the battery aluminum bar is reduced, the power of the aluminum bar laser welding equipment can be reduced, thereby improving production efficiency and reducing processing costs.

[0033] In one embodiment of the present invention, please refer to Figure 1 The deformation section 10 is extended from one connecting section 20 to another connecting section 20, so that the stretching and shortening direction of the deformation section 10 is consistent with the expansion and contraction direction of the two battery cells 30, thereby enhancing the battery aluminum bar's resistance to expansion problems between the battery cells 30.

[0034] In one embodiment of the present invention, please refer to Figure 2 The deformation section 10 includes a plurality of undulating portions 100 connected in sequence. A first rounded corner portion 101 is provided on the top of each undulating portion 100. In this way, the first rounded corner portion 101 can reduce stress concentration and extend the service life of the battery aluminum bar. At the same time, the first rounded corner portion 101 has a larger surface area, which can improve the heat dissipation area and mechanical strength.

[0035] In one embodiment of the present invention, please refer to Figure 2 A second rounded corner portion 102 is provided between any two adjacent undulating portions 100. The provision of the second rounded corner portion 102 further reduces the stress concentration at the intersection of the two undulating portions 100. At the same time, it can improve the heat conduction path so that the heat can be distributed more evenly, thereby improving the heat dissipation efficiency.

[0036] In one embodiment of the present invention, please refer to Figure 2 The deformation section 10 is wavy in shape. In this way, the wavy design can increase the contact area of ​​the deformation section 10, thereby improving the bearing capacity, so that it can withstand greater force or weight; further, the wavy deformation section 10 can provide better mechanical properties, such as bending strength and torsional strength, making the battery aluminum more robust when subjected to lateral force or torque.

[0037] In one embodiment of the present invention, please refer to Figure 2 The lowest end of the deformation segment 10 is higher than or level with the connecting surface 20a of the connecting segment 20, wherein the connecting surface 20a of the connecting segment 20 is used to connect the tab of the battery cell 30. In this way, the lowest point of the deformation segment 10 is higher than the surface of the battery cell 30, avoiding short circuit problems caused by contact between the two; at the same time, when the battery aluminum bar is idle, the connecting segment 20 can contact the supporting surface (the ground or any table, etc.) to achieve surface-to-surface contact, which is convenient for handling and transportation; at the same time, the gap created by the lowest point of the deformation segment 10 being higher than the surface of the battery cell 30 can be visually observed by maintenance personnel, thereby improving maintenance efficiency.

[0038] In one embodiment of the present invention, please refer to Figure 3 Each connecting section 20 is provided with a positioning hole 20b, which is used to align the battery cell 30 tab. The positioning hole 20b can be used to visually observe the position of the battery tab during the installation process of the battery aluminum bar, avoid the problem of misalignment between the connecting section 20 and the battery tab, and improve the assembly yield.

[0039] In one embodiment of the present invention, please refer to Figure 3 Each connecting section 20 is provided with a rounded arc edge 20c, and each rounded arc edge 20c is located at the end of the connecting section 20 away from the deformation section 10. In this way, the material of the battery aluminum bar can be reduced and the production cost can be reduced.

[0040] The present invention proposes a battery module, please refer to Figure 4The battery module includes a plurality of battery cells 30 and a plurality of battery aluminum bars. An expansion gap is provided between any two adjacent battery cells 30, and the deformation section 10 is arranged in alignment with the expansion gap. In this way, the battery aluminum bar's ability to resist the expansion gap between the battery cells 30 can be enhanced. Furthermore, the connecting section 20 connects and shields the tabs of the battery cell 30, which can strengthen the welding strength between the connecting section 20 and the tabs of the battery cell 30. The specific structure of the battery aluminum bar refers to the above embodiment. At the same time, the battery module includes all embodiments of the battery aluminum bar. Since the battery module proposed in the utility model adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0041] The present invention proposes an energy storage battery box, which includes a casing and a battery module. The battery module is fixed to the casing. The energy storage battery box includes all embodiments of the battery module. At the same time, the battery module has all the structures of the battery aluminum bar. The specific structure refers to the above embodiments. Since the energy storage battery box proposed by the present invention adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here.

[0042] The above are merely exemplary embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A battery aluminum bar, characterized in that: The battery aluminum bar comprises a deformation section (10) and connection sections (20) located at both ends of the deformation section (10), wherein the deformation section (10) and the connection section (20) are an integrally formed structure; Wherein, the deformation section (10) is a flexible structure, and the connecting section (20) is a rigid structure.

2. The battery aluminum bar according to claim 1, characterized in that The deformation section (10) is extended along a direction from one connecting section (20) to another connecting section (20).

3. The battery aluminum bar according to claim 1, characterized in that The deformation section (10) comprises a plurality of undulating portions (100) connected in sequence, and a first rounded corner portion (101) is provided at the top of each undulating portion (100).

4. The battery aluminum bar according to claim 3, characterized in that A second rounded corner portion (102) is provided between any two adjacent undulating portions (100).

5. The battery aluminum bar according to any one of claims 3 or 4, characterized in that: The deformation section (10) is in a wave shape.

6. The battery aluminum bar according to claim 1, characterized in that The lowest end of the deformation section (10) is higher than or level with the connection surface (20a) of the connection section (20); The connection surface (20a) of the connection section (20) is used to connect to the tab of the battery cell (30).

7. The battery aluminum bar according to claim 1, characterized in that Each of the connecting sections (20) is provided with a positioning hole (20b), and the positioning hole (20b) is used for aligning the tabs of the battery cell (30).

8. The battery aluminum bar according to claim 1, characterized in that Each of the connecting sections (20) is provided with a rounded arc edge (20c), and each of the rounded arc edge (20c) is located at an end of the connecting section (20) away from the deformation section (10).

9. A battery module, characterized in that: The battery module includes a plurality of battery cells (30) and a plurality of battery aluminum bars as described in any one of claims 1 to 8, an expansion gap is provided between any two adjacent battery cells (30), the deformation section (10) is arranged to correspond to the expansion gap, and the connecting section (20) connects and shields the tabs of the battery cells (30).

10. An energy storage battery box, characterized in that: The energy storage battery box includes a casing and the battery module according to claim 9, and the battery module is fixed to the casing.

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