Connecting structure, battery frame structure, battery pack and energy storage device

Abstract

The utility model relates to the technical field of batteries, in particular to a connecting structure, a battery frame structure, a battery pack and an energy storage device, the connecting structure is used for connecting an edge beam and a cross beam, the connecting structure comprises a first connecting piece, a second connecting piece and a fixing piece, and the first connecting piece is provided with a first plane and a second plane which are oppositely arranged; the first plane is used for being connected with the outer wall face of the edge beam. The second connecting piece is provided with a third plane used for being connected with the second plane. The fixing piece enables the cross beam to be connected with the edge beam by connecting the second connecting piece and the cross beam. The first plane is connected with the outer wall face of the edge beam, the third plane is connected with the second plane, the contact area of the connecting position can be increased, stress of the connecting position is evenly dispersed, and therefore the stress concentration phenomenon of the connecting position is relieved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a connection structure, a battery frame structure, a battery pack and an energy storage device. Background Art

[0002] In the field of new energy, the middle crossbeam of the battery pack can improve the whole pack mode and increase the stiffness of the whole pack. Therefore, the design of the middle crossbeam and its connection is very important, and it is necessary to consider many factors such as material selection, structural optimization and process refinement. Especially in the manufacturing process, production and testing must be carried out in strict accordance with quality standards to avoid quality problems and ensure product reliability and safety.

[0003] The connection design of the crossbeam and the side beams needs to consider the following aspects: First, structural strength: the middle crossbeam and its connection structure with the side beams need to have sufficient strength to withstand the vibration and impact that the battery pack may encounter during vehicle driving. Insufficient strength may cause the battery pack structure to loosen or break, thus affecting the safety of the battery pack; Second, process feasibility: the middle crossbeam and its connection design also need to consider process feasibility, and too much welding will affect the battery pack production yield. In summary, the middle crossbeam of the battery pack and its connection design play an important role in the design of the new energy battery pack, which affects the structural strength, sealing performance and stability of the battery pack. These factors need to be considered comprehensively during the design process to ensure the performance of the battery pack.

[0004] At present, the middle cross beam and the side beam are connected by thin-wall welding. However, thin-wall welding can only connect the outer thin plate of the battery pack cross beam. When the battery pack is subjected to vibration and impact tests, the amplitude causes the root mean square stress generated in the weld at the connection between the middle cross beam and the side beam to be large, and even exceeds the strength of the material itself, causing the risk of rupture, and ultimately causing failure of the battery pack structure. Utility Model Content

[0005] The present application provides a connection structure, a battery frame structure, a battery pack and an energy storage device, which are used to solve the problem in the prior art that the cross beam and the side beam of the battery pack are connected by thin-wall welding, and the root mean square stress at the weld is large and easily causes the weld to crack.

[0006] On the one hand, the present application provides a connection structure, which is used to connect a side beam and a cross beam, and the connection structure includes:

[0007] A first connecting member has a first plane and a second plane that are arranged opposite to each other, wherein the first plane is used to connect with the outer wall surface of the edge beam;

[0008] A second connecting member having a third plane, wherein the third plane is used to connect with the second plane;

[0009] The fixing member connects the cross beam to the side beam by connecting the second connecting member to the cross beam.

[0010] In one possible design, the second connecting member includes:

[0011] A stress dispersion plate, wherein a side of the stress dispersion plate close to the first connecting member forms a third plane;

[0012] The support plate is vertically connected to the stress dispersion plate, and a mounting hole is provided on the support plate.

[0013] In a possible design, the second connecting member further includes a reinforcing plate, which is in the shape of a right-angled triangle, wherein one right-angled side of the reinforcing plate is vertically connected to the stress dispersion plate, and the other right-angled side of the reinforcing plate is vertically connected to the support plate.

[0014] In a possible design, the first connecting member is plate-shaped, a first plane is formed on a side of the first connecting member close to the side beam, the first plane is in contact with the outer wall surface of the side beam, and the edge of the first plane is welded and fixed to the outer wall surface of the side beam;

[0015] And / or, the first connecting member is in a plate shape, a side of the first connecting member away from the side beam forms a second plane, the third plane fits the second plane, and an edge of the third plane is welded and fixed to the second plane.

[0016] In a possible design, a convex portion is provided on the second plane, and an avoidance hole for allowing the convex portion to pass through is opened on the stress dispersion plate.

[0017] In a possible design, a groove is opened on the second plane, the stress dispersion plate is arranged in the groove, the outer surface of the stress dispersion plate is in contact with the inner wall of the groove, and the edge of the stress dispersion plate is welded and fixed to the inner wall of the groove.

[0018] In a possible design, the fixing member includes a fixing bolt, and the fixing bolt is inserted into the mounting hole.

[0019] On the other hand, the present application also provides a battery frame structure, including the connection structure as described above.

[0020] On the other hand, the present application also provides a battery pack, including the battery frame structure as described above.

[0021] On the other hand, the present application also provides an energy storage device, including the battery pack as described above.

[0022] The beneficial effects of this application are as follows:

[0023] The connection structure of the present application is provided with a first connection member, a second connection member and a fixing member, wherein the first connection member is connected to the side beam, the second connection member is connected to the first connection member, and the fixing member connects the cross beam to the side beam by connecting the second connection member to the cross beam. Compared with the prior art in which the cross beam and the side beam are directly welded, the addition of the first connection member and the second connection member can effectively weaken the root mean square stress at the connection between the cross beam and the side beam. Specifically: the first connection member has a first plane and a second plane that are relatively arranged, and the second connection member has a third plane. By connecting the first plane to the outer wall surface of the side beam and connecting the third plane to the second plane, the contact area at the connection can be increased, and the stress at the connection can be evenly dispersed, thereby alleviating the stress concentration phenomenon at the connection.

[0024] The battery frame structure provided in the present application includes the connection structure in the present application, and thus also includes all the above-mentioned advantages of the connection structure.

[0025] The battery pack provided in the present application includes the battery frame structure in the present application, and therefore also includes all the above-mentioned advantages of the battery frame structure.

[0026] The energy storage device provided in the present application includes the battery pack in the present application, and therefore also includes all the above-mentioned advantages of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the connection between the side beam and the cross beam in the prior art;

[0029] Figure 2 for Figure 1 A magnified view of the structure at center A;

[0030] Figure 3 A schematic diagram of the connection structure provided in the embodiment of the present application;

[0031] Figure 4 A front view of the connection structure provided in an embodiment of the present application;

[0032] Figure 5 for Figure 4 Cross-sectional view of the middle BB;

[0033] Figure 6 for Figure 4 Cross-sectional view of the middle DD;

[0034] Figure 7 A side view of a connection structure provided in an embodiment of the present application;

[0035] Figure 8 for Figure 7 Cross-sectional view of CC;

[0036] Reference numerals:

[0037] 100, side beam; 200, cross beam; 300, first connecting member; 310, first plane; 320, second plane; 400, second connecting member; 410, stress dispersion plate; 411, third plane; 420, support plate; 430, reinforcement plate; 500, fixing member. DETAILED DESCRIPTION

[0038] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0039] Reference Figure 1 , Figure 2 As shown, in the prior art, the middle cross beam and the side beam are connected by thin-wall welding, and the thin-wall welding can only connect the outer thin plate of the battery pack cross beam. When the battery pack is subjected to vibration and impact tests, the amplitude causes the root mean square stress generated in the weld at the connection between the middle cross beam and the side beam to be relatively large, and even exceeds the strength of the material itself, causing the risk of rupture, and ultimately causing failure of the battery pack structure.

[0040] Combine the following Figure 3-Figure 8 , describes the connection structure provided in the embodiment of the present application, the connection structure is used to connect the side beam 100 and the cross beam 200, the connection structure includes a first connection member 300, a second connection member 400 and a fixing member 500, the first connection member 300 has a first plane 310 and a second plane 320 arranged opposite to each other, the first plane 310 is used to connect with the outer wall surface of the side beam 100; the second connection member 400 has a third plane 411, the third plane 411 is used to connect with the second plane 320; the fixing member 500 connects the cross beam 200 with the side beam 100 by connecting the second connection member 400 with the cross beam 200. Specifically, the area of ​​the first plane 310 is greater than the area of ​​the third plane 411 is greater than the cross-sectional area of ​​the cross beam 200. By connecting the first plane 310 with the outer wall surface of the side beam 100 and connecting the third plane 411 with the second plane 320, the contact area of ​​the connection can be increased, the stress at the connection can be evenly dispersed, and the stress concentration phenomenon at the connection can be alleviated.

[0041] By utilizing the technical solution in the above-mentioned embodiment, by setting a first connecting member 300, a second connecting member 400 and a fixing member 500, the first connecting member 300 is connected to the side beam 100, the second connecting member 400 is connected to the first connecting member 300, and the fixing member 500 connects the crossbeam 200 to the side beam 100 by connecting the second connecting member 400 to the crossbeam 200. Compared with the prior art in which the crossbeam 200 and the side beam 100 are directly welded, after adding the first connecting member 300 and the second connecting member 400, the root mean square stress at the connection between the crossbeam 200 and the side beam 100 can be effectively weakened, the overall structural strength after the connection between the crossbeam 200 and the side beam 100 is improved, and the risk of battery frame rupture is reduced, thereby improving the safety performance of the battery pack.

[0042] Reference Figure 3 As shown, in some embodiments of the present application, the second connector 400 includes a stress dispersion plate 410 and a support plate 420, and the side of the stress dispersion plate 410 close to the first connector 300 forms a third plane 411; the support plate 420 is vertically connected to the stress dispersion plate 410, and a mounting hole is provided on the support plate 420. In some specific embodiments, the number of the second connectors 400 is two, and the two second connectors 400 are symmetrically arranged on the left and right sides of the beam 200, so that the two support plates 420 are symmetrically arranged on the left and right sides of the beam 200. Specifically, a through hole is provided at a position corresponding to the mounting hole on the beam 200, and the support plate 420 is fixedly connected to the beam 200 by passing the fixing member 500 through the mounting hole and the through hole in sequence. Specifically, the fixing member 500 is a fixing bolt, and the fixing bolt passes through the mounting hole and the through hole in sequence to fix the support plate 420 to the beam 200. In some specific embodiments, the stress dispersion plate 410 and the support plate 420 are an integrated structure. By setting the stress dispersion plate 410 and connecting the third plane 411 of the stress dispersion plate 410 with the second plane 320 of the first connecting member 300, the root mean square stress at the connection between the cross beam 200 and the side beam 100 can be effectively weakened, thereby improving the overall structural strength of the cross beam 200 and the side beam 100 after connection.

[0043] Reference Figure 3 As shown, in some embodiments of the present application, the second connector 400 further includes a reinforcing plate 430, which is in the shape of a right-angled triangle, one right-angled side of the reinforcing plate 430 is vertically connected to the stress dispersion plate 410, and the other right-angled side of the reinforcing plate 430 is vertically connected to the support plate 420. The reinforcement plate 430 can be provided to increase the connection firmness between the stress dispersion plate 410 and the support plate 420.

[0044] Reference Figure 3As shown, in some embodiments of the present application, the first connecting member 300 is in the shape of a plate, and the first plane 310 is formed on the side of the first connecting member 300 close to the side beam 100. The first plane 310 is in contact with the outer wall of the side beam 100, and the edge of the first plane 310 is welded and fixed to the outer wall of the side beam 100. In some embodiments, the first connecting member 300 is in the shape of a rectangular plate, and a circle of welds is formed between the edge of the first connecting member 300 and the outer wall of the side beam 100, that is, the perimeter of the first connecting member 300 is the length of the weld. In this way, by welding the first plane 310 to the outer wall of the side beam 100, the weld can be extended, and the stress at the weld can be evenly dispersed, thereby alleviating the stress concentration phenomenon at the connection. In addition, by welding the first connecting member 300 to the side beam 100, local reinforcement of the side beam 100 can be achieved, thereby strengthening the structural strength of the side beam 100 itself.

[0045] Reference Figure 3 As shown, in some embodiments of the present application, the first connecting member 300 is in a plate shape, a side of the first connecting member 300 away from the side beam 100 forms a second plane 320, the third plane 411 is in contact with the second plane 320, and the edge of the third plane 411 is welded and fixed to the second plane 320. By welding the third plane 411 to the second plane 320, it is beneficial to increase the length of the weld between the first connecting member 300 and the second connecting member 400, and evenly disperse the stress at the weld, thereby alleviating the stress concentration phenomenon at the connection.

[0046] In some embodiments of the present application, a convex portion is provided on the second plane 320, and an avoidance hole for the convex portion to pass through is provided on the stress dispersion plate 410. In some specific embodiments, the convex portion is a rectangular block or a convex column, and the avoidance hole corresponds to a rectangular hole or a circular hole, and the convex portion can be inserted into the avoidance hole. On the one hand, the convex portion can provide an upward support force to the stress dispersion plate 410, and on the other hand, the avoidance hole and the convex portion cooperate to play a positioning role during installation. In some of the specific embodiments, the edge of the convex portion is fixed to the inner wall of the avoidance hole by welding, so as to further extend the length of the weld, so that the stress at the weld is evenly dispersed, thereby alleviating the stress concentration phenomenon at the connection.

[0047] In some embodiments of the present application, a groove is provided on the second plane 320, and the stress dispersion plate 410 is disposed in the groove, the outer surface of the stress dispersion plate 410 is fitted with the inner wall of the groove, and the edge of the stress dispersion plate 410 is welded and fixed to the inner wall of the groove. Specifically, the groove is a rectangular groove, and the stress dispersion plate 410 is matched with the inner wall gap of the rectangular groove. In this way, on the one hand, the groove can provide an upward support force to the stress dispersion plate 410, and on the other hand, the groove and the stress dispersion plate 410 can play a positioning role during installation. At the same time, by welding the edge of the stress dispersion plate 410 to the inner wall of the groove, the length of the weld can be further extended, and the stress at the weld can be evenly dispersed, thereby alleviating the stress concentration phenomenon at the connection.

[0048] Reference Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 In some specific embodiments, the first connecting member 300 is a rectangular plate with a length of L, a width of W, and a thickness of t2. The distances from the beam 200 to the edge of the first connecting member 300 are m, n, and g, respectively; the thickness of the beam 200 is t; the thickness of the second connecting member 400 is t1, the width is a, the length is b, and the height is H; the thickness of the reinforcing plate 430 is t3, and the distance between the fixing bolt and the first connecting member 300 is c.

[0049] For the first connector 300, the size in the height direction is greatly limited by the battery pack box, so the edge of the first connector 300 reserves the size n≥t2, m≥10mm, g≥1mm; the L and W sizes are determined by the beam 200 and the m and n sizes; the thickness of the second connector 400 is t1≥2*t (the wall thickness of the beam 200 is t, t is 1~1.5mm), the width of the second connector 400 is a≥0.5*the width of the beam 200, H≥1.5 *a, b≥2*a, to ensure the connection strength of the second connecting member 400, the thickness of the reinforcing plate 430 is t3≥3*t (the wall thickness of the beam 200 is t, t is 1~1.5mm); the distance between the mounting hole of the support plate 420 and the first connecting member 300 is: 0.6*H≥c≥0.4*H, to ensure the reliability of the fixed bolt connection; the thickness of the first connecting member 300 is t2≥3*t (the wall thickness of the beam 200 is t, t is 1~1.5mm). The connection between the beam 200 and the side beam 100 in this embodiment has better reliability, which minimizes the risk of failure of the weld of the middle beam 200 of the battery pack during testing and daily use.

[0050] A battery frame structure is also provided in an embodiment of the present application, including the connection structure in the above embodiment.

[0051] It should be noted that the battery frame structure includes the connection structure, which also includes all the advantages of the connection structure mentioned above, which will not be repeated here.

[0052] A battery pack is also provided in an embodiment of the present application, comprising the battery frame structure in the above embodiment.

[0053] It should be noted that the battery pack includes a battery frame structure, which also includes all the advantages of the battery frame structure mentioned above, which will not be repeated here.

[0054] The present application also provides an energy storage device in an embodiment, including the battery pack in the above embodiment. Specifically, the energy storage device can be a vehicle, an operating machine, etc.

[0055] It should be noted that the energy storage device includes a battery pack, which also includes all the advantages of the battery pack mentioned above, which will not be repeated here.

[0056] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0057] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0058] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A connection structure, characterized in that: The connecting structure is used to connect the side beam and the cross beam, and the connecting structure includes: A first connecting member having a first plane and a second plane arranged opposite to each other, wherein the first plane is used to connect with the outer wall surface of the side beam; A second connecting member having a third plane, wherein the third plane is connected to the second plane; A fixing member is used to connect the cross beam and the side beam by connecting the second connecting member and the cross beam.

2. The connection structure according to claim 1, characterized in that: The second connecting member comprises: A stress dispersion plate, wherein a side of the stress dispersion plate close to the first connecting member forms the third plane; The support plate is vertically connected to the stress dispersion plate, and a mounting hole is formed on the support plate.

3. The connection structure according to claim 2, characterized in that: The second connecting member further includes a reinforcing plate, which is in the shape of a right-angled triangle, one right-angled side of the reinforcing plate is vertically connected to the stress dispersion plate, and the other right-angled side of the reinforcing plate is vertically connected to the support plate.

4. The connection structure according to claim 3, characterized in that: The first connecting member is in the shape of a plate, and a side of the first connecting member close to the side beam forms the first plane, the first plane is in contact with the outer wall surface of the side beam, and the edge of the first plane is welded and fixed to the outer wall surface of the side beam; And / or, the first connecting member is in the shape of a plate, a side of the first connecting member away from the side beam forms the second plane, the third plane is in contact with the second plane, and an edge of the third plane is welded and fixed to the second plane.

5. The connection structure according to any one of claims 2 to 4, characterized in that: A convex portion is arranged on the second plane, and an avoidance hole for the convex portion to pass through is opened on the stress dispersion plate.

6. The connection structure according to any one of claims 2 to 4, characterized in that: A groove is provided on the second plane, the stress dispersion plate is arranged in the groove, the outer surface of the stress dispersion plate is in contact with the inner wall of the groove, and the edge of the stress dispersion plate is fixed to the inner wall of the groove by welding.

7. The connection structure according to any one of claims 2 to 4, characterized in that: The fixing member comprises a fixing bolt, and the fixing bolt is passed through the mounting hole.

8. A battery frame structure, characterized in that: The invention comprises the connection structure according to any one of claims 1 to 7.

9. A battery pack, characterized in that: Including the battery frame structure as described in claim 8.

10. An energy storage device, characterized in that: A battery pack comprising the battery pack of claim 9.

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