Expansion cross beam, battery box body, battery and vehicle

Abstract

The utility model relates to the technical field of vehicles, in particular to an expansion cross beam, a battery box, a battery and a vehicle, the expansion cross beam comprises a first beam body and a second beam body, the first beam body comprises a main beam body and a reinforcing rib plate, the main beam body and the second beam body extend in the first direction and are of a hollow structure, and the main beam body is connected to the second beam body; a reinforcing rib plate is arranged in the cavity of the main beam body and connected between the two side walls of the main beam body in the second direction, and the first direction is perpendicular to the second direction. After the expansion cross beam is installed in a box body of the battery, the second beam body is close to a bottom plate of the box body relative to the first beam body. The main beam body and the second beam body are arranged to be of a hollow structure, the expansion force of the battery cell is absorbed and transmitted through deformation, the structural strength of the first beam body is improved through the reinforcing rib plates, and therefore the risk that the connecting bar pieces at the top of the battery cell are pulled and fail due to inclined deformation of the expansion cross beam is reduced. And the reinforcing rib plates are only arranged in the main beam body, so that the weight of the expansion cross beam can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicles, and particularly to an expansion crossbeam, a battery box, a battery and a vehicle. Background Art

[0002] During the charge and discharge cycle of the battery cell, due to factors such as internal gas generation and electrode expansion, the battery cell will expand. Therefore, an expansion crossbeam is usually provided on the battery cell box to withstand the expansion force of the battery cell.

[0003] As the main energy absorption component of the battery, the expansion crossbeam is crucial for the stable and reliable operation of the battery, and its structure directly affects the reliability of the battery. At present, the expansion crossbeam is generally formed by roll-pressing steel plates and welding them together, and a plurality of reinforcing ribs are arranged at equal intervals in the height direction inside to better withstand the expansion force of the battery cell. However, this setting makes the overall weight of the expansion crossbeam relatively heavy, resulting in a lower energy density of the battery. Summary of the Utility Model

[0004] In order to solve the above technical problems, the present disclosure provides an expansion crossbeam, a battery box, a battery and a vehicle.

[0005] In a first aspect, the present disclosure provides an expansion crossbeam, including a first beam body and a second beam body. The first beam body includes a main beam body and a reinforcing rib plate. The main beam body and the second beam body both extend along a first direction and are hollow structures. The main beam body is connected to the second beam body. The reinforcing rib plate is disposed in the cavity of the main beam body and is connected between the two side walls of the main beam body in a second direction perpendicular to the first direction.

[0006] After the expansion crossbeam is installed in the box body of the battery, the second beam body is closer to the bottom plate of the box body relative to the main beam body.

[0007] Optionally, the material of the first beam body is steel, and the material of the second beam body is any one of aluminum, aluminum alloy and polymer materials.

[0008] Optionally, in a third direction perpendicular to both the first direction and the second direction, the height of the main beam body is H1, and the height of the second beam body is H2, where 1 / 2 ≤ H1 / (H1 + H2) ≤ 2 / 3.

[0009] Optionally, the main beam body includes two U-shaped split beams, and the two split beams are connected to form the cavity. One side of the reinforcing rib plate in the second direction is connected to one of the split beams, and the other side is connected to the other split beam.

[0010] Optionally, a preset angle is formed between the reinforcing rib plate and the side of each split beam, and the preset angle is greater than or equal to 45° and less than or equal to 135°.

[0011] Optionally, the split beam includes a first beam plate, a second beam plate, and a third beam plate that are integrally formed. The first beam plate and the third beam plate are disposed opposite to each other. In the depth direction of the U-shaped cavity of the split beam, the height of the first beam plate is greater than the height of the third beam plate. The first beam plate of each split beam is connected to the third beam plate of another split beam.

[0012] Optionally, the first beam plate of each split beam is welded to the third beam plate of another split beam, and the reinforcing rib plate is welded to the first beam plate of each split beam. In the depth direction of the U-shaped cavity of the split beam, the weld between the first beam plate and the third beam plate is spaced from the weld between the first beam plate and the reinforcing rib plate on the same side by a preset distance.

[0013] Optionally, the expansion cross beam further includes a plurality of third beam bodies that extend along the first direction and are U-shaped. The third beam bodies are connected to the second beam body and form a cavity between the third beam bodies and the second beam body.

[0014] Optionally, the second beam body and the plurality of third beam bodies are integrally formed.

[0015] In a second aspect, the present disclosure provides a battery box, including a box body and the expansion cross beam provided in the first aspect. The box body includes a bottom plate and a plurality of side beams connected to the bottom plate. The bottom plate and the plurality of side beams enclose a containing cavity for containing battery cells. The expansion cross beam is disposed in the containing cavity. Both ends of the main beam body in the first direction are connected to the side beams, both ends of the second beam body in the first direction are connected to the side beams, and the second beam body is connected to the bottom plate.

[0016] Optionally, the battery box further includes a connecting member that is connected between the second beam body and the side beam.

[0017] Optionally, the expansion cross beam further includes a plurality of third beam bodies that extend along the first direction and are U-shaped. The third beam bodies are connected to the second beam body and form a cavity between the third beam bodies and the second beam body;

[0018] The battery box further includes a busbar support member, a BMS support member, and a wire harness support member. The busbar support member, the BMS support member, and the wire harness support member are all connected to the third beam body.

[0019] In a third aspect, the present disclosure provides a battery, including the battery box provided in the third aspect.

[0020] In a fourth aspect, the present disclosure provides a vehicle, including the battery provided in the third aspect.

[0021] The technical solutions provided by the embodiments of the present disclosure have the following advantages compared with the prior art:

[0022] By setting the main beam body and the second beam body as hollow structures, it is possible to utilize deformation to absorb and transfer the expansion force of the battery cells, reduce the probability of the battery cells deforming due to the expansion force, and at the same time use the reinforcing rib plates to connect both sides of the main beam body in the second direction, and the reinforcing rib plates are located in the cavity of the main beam body, which can increase the structural strength of the first beam body. After the expansion cross beam is installed on the battery box, it can enhance the ability of the first beam body to resist the expansion force of the battery cells, thereby reducing the risk that the connecting tabs at the top of the battery cells are pulled and fail due to the inclined deformation of the expansion force. Moreover, only the reinforcing rib plates are provided in the main beam body, while the second beam body is set as a hollow structure, which can reduce the weight of the expansion cross beam while enhancing the ability of the expansion cross beam to resist the expansion force, thereby reducing the overall weight of the battery and improving the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present disclosure and used together with the specification to explain the principles of the present disclosure.

[0024] To more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the accompanying drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 Partial structural schematic diagram of the battery box of the expansion battery according to the embodiment of the present disclosure;

[0026] Figure 2 Structural schematic of the expansion cross beam according to the embodiment of the present disclosure Figure 1 ;

[0027] Figure 3 Structural schematic of the expansion cross beam according to the embodiment of the present disclosure Figure 2 ;

[0028] Figure 4 Structural schematic diagram of the split beam according to the embodiment of the present disclosure;

[0029] Figure 5 Structural schematic diagram of the second beam body and the third beam body according to the embodiment of the present disclosure;

[0030] Figure 6 For Figure 5 Partial enlarged schematic diagram.

[0031] Among them, 10 is the expansion crossbeam; 20 is the bottom plate; 30 is the side beam; 40 is the connecting piece;

[0032] 1 is the first beam body; 11 is the main beam body; 111 is the split beam; 1111 is the first beam plate; 1112 is the second beam plate; 1113 is the third beam plate; 12 is the reinforcing rib plate;

[0033] 2 is the second beam body;

[0034] 3 is the third beam body. Specific implementation manner

[0035] In order to more clearly understand the above-mentioned objects, features and advantages of the present disclosure, the solutions of the present disclosure will be further described below. It should be noted that, without conflict, the embodiments of the present disclosure and the features in the embodiments can be combined with each other.

[0036] Many specific details are set forth in the following description in order to fully understand the present disclosure, but the present disclosure can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present disclosure, rather than all the embodiments.

[0037] As Figures 1 to 6 shown, the present disclosure provides an expansion crossbeam 10, which includes a first beam body 1 and a second beam body 2. Among them, the first beam body 1 includes a main beam body 11 and a reinforcing rib plate 12. Both the main beam body 11 and the second beam body 2 are hollow structures along the first direction, and the main beam body 11 is connected to the second beam body 2. A reinforcing rib plate 12 is arranged in the cavity of the main beam body 11, and the reinforcing rib plate 12 is connected between the two side walls of the main beam body 11 in the second direction. The first direction is perpendicular to the second direction. After the expansion crossbeam 10 is installed on the battery box body, the second beam body 2 is closer to the bottom plate 20 of the box body relative to the main beam body 11. The above-mentioned first direction is as Figure 2 shown in the X direction, and the second direction is as Figure 2 shown in the Y direction.

[0038] Understandably, by setting the main beam body 11 and the second beam body 2 as hollow structures, it is possible to utilize deformation to absorb and transfer the expansion force of the battery cell, reduce the probability of the battery cell deforming due to the expansion force, and at the same time use the reinforcing rib plate 12 to connect both sides of the main beam body 11 in the second direction, and the reinforcing rib plate 12 is located inside the cavity of the main beam body 11, which can increase the structural strength of the first beam body 1. After the expansion cross beam 10 is installed on the battery box, the ability of the first beam body 1 to resist the expansion force of the battery cell can be enhanced, thereby reducing the risk that the connecting tab at the top of the battery cell is pulled and fails due to the inclined deformation caused by the expansion force. Moreover, only the reinforcing rib plate 12 is arranged inside the main beam body 11, and the second beam body 2 is set as a hollow structure, which can reduce the weight of the expansion cross beam 10 while enhancing the ability of the expansion cross beam 10 to resist the expansion force, thereby reducing the overall weight of the battery and increasing the energy density of the battery.

[0039] It should be noted that after the expansion cross beam 10 is installed on the battery box, the end of the battery cell with the pole is far from the bottom plate 20 of the box and close to the first beam body 1. Thus, during the expansion period of the battery cell, the expansion cross beam 10 is prone to inclined deformation under the expansion force of the battery cell, so that the battery cell also generates inclined deformation and pulls the connecting tab connected to the pole, and then it is easy for the connecting tab or the pole to be damaged. Therefore, by arranging the reinforcing rib plate 12 inside the main beam body 11 and setting the second beam body 2 as a hollow structure, the ability of the main beam body 11 to resist the expansion force of the battery cell in the second direction can be enhanced, and at the same time, the overall weight of the expansion cross beam can be reduced.

[0040] In some embodiments, the material of the above-mentioned first beam body 1 is steel, and the material of the second beam body 2 is any one of aluminum, aluminum alloy or polymer materials.

[0041] Understandably, the first beam body 1 is made of steel, and the second beam body 2 is made of aluminum, aluminum alloy or polymer materials. Compared with the expansion cross beam made entirely of steel, it can further enhance the structural strength of the first beam body 1 and reduce the overall weight of the expansion cross beam 10.

[0042] It should be noted that the above-mentioned polymer materials can be selected as PA nylon materials, PA nylon + glass fiber materials, etc., and no specific limitations are made here.

[0043] In some embodiments, in the third direction, the height of the main beam body 11 is H1, and the height of the second beam body 2 is H2, where 1 / 2 ≤ H1 / (H1 + H2) ≤ 2 / 3, and the third direction, the second direction and the first direction are perpendicular to each other in pairs. The above-mentioned third direction is as Figure 2 the Z direction shown in the figure.

[0044] By setting the height of the main beam body 11 as H1 and the height of the second beam body 2 as H2, considering the balance of structural strength, weight and space, H1 and H2 are set to satisfy 1 / 2 ≤ H1 / (H1 + H2) ≤ 2 / 3, which can enhance the structural strength of the expansion cross beam 10 while achieving the effect of weight reduction.

[0045] It should be noted that through the settings of the first beam body 1 and the second beam body 2 in terms of structure, material and the height ratio in the third direction, a reasonable distribution of the weight of the expansion cross beam 10 is achieved, and the weight is applied to the position that needs to resist a larger expansion force of the battery cell (that is, the first beam body 1), thereby reducing the overall weight of the expansion cross beam 10 and improving the energy density of the battery. The energy density of the battery herein refers to the weight energy density.

[0046] As Figures 2 to 4 shown, the main beam body 11 includes two U-shaped split beams 111. The two split beams 111 are connected to form a cavity. The stiffening rib plate 12 is connected to one of the split beams 111 on one side in the second direction and to the other split beam 111 on the other side.

[0047] It can be understood that the above main beam body 11 is composed of two split beams 111 with the same structure. In this way, only one set of molds is required for molding, which can reduce the number of molds and lower the cost. Moreover, the structures of the split beams are the same, which is convenient for assembly.

[0048] Referring to Figure 4 , in some embodiments, the split beam 111 includes integrally formed first beam plates 1111, second beam plates 1112 and third beam plates 1113. The first beam plates 1111 and the third beam plates 1113 are oppositely arranged. In the depth direction of the U-shaped cavity of the split beam 111, the height of the first beam plates 1111 is greater than the height of the third beam plates 1113. The first beam plates 1111 of each split beam 111 are connected to the third beam plates 1113 of the other split beam 111.

[0049] It can be understood that by setting the height of the first beam plates 1111 of the split beam 111 to be greater than the height of the third beam plates 1113, when the two split beams 111 are connected by welding, the welds formed by the two split beams 111 can be staggered from each other in the depth direction of the U-shaped cavity of the split beam 111, thereby improving the connection strength of the two split beams 111.

[0050] Furthermore, the first beam plates 1111 of each split beam 111 are welded to the third beam plates 1113 of the other split beam 111, and the stiffening rib plate 12 is welded to the first beam plates 1111 of each split beam 111. In the depth direction of the U-shaped cavity of the split beam 111, the weld between the first beam plates 1111 and the third beam plates 1113 is spaced apart from the weld between the first beam plates 1111 and the stiffening rib plate 12 on the same side by a preset distance.

[0051] Understandably, the weld seams of the first beam plate 1111 and the third beam plate 1113 are staggered in the depth direction of the U-shaped cavity from the weld seams of the first beam plate 1111 and the stiffening rib plate 12, so as to avoid the overlap of stress concentration areas and improve the welding strength.

[0052] Furthermore, for the convenience of welding the two split beams 111, a flange extending in the direction close to the third beam plate 1113 is formed by bending the first beam plate 1111 of the split beam 111, and a flange extending in the direction close to the first beam plate 1111 is formed by bending the third beam plate 1113. The flange of the third beam plate 1113 of one split beam 111 is welded to the flange of the first beam plate 1111 of the other split beam 111. By providing the flanges, the connection area of the two split beams 111 can be enhanced, the welding area can be increased, and thus the connection strength of the two split beams 111 can be improved.

[0053] It should be noted that the above split beam 111 is roll-formed, that is, the first beam plate 1111, the second beam plate 1112 and the third beam plate 1113 of the split beam 111 are integrally formed, which can reduce the number of parts and the assembly difficulty.

[0054] It should be noted that the above main beam body 11 is connected to the second beam body 2. Specifically, the second beam plate 1112 of the main beam body 11 is connected to the second beam body 2. Since the materials of the main beam body 11 and the second beam body 2 are different, the connection method can be selected as a combination of riveting and bonding, or a combination of screwing and bonding.

[0055] In some embodiments, a preset angle is formed between the stiffening rib plate 12 and the side of each split beam 111. The preset angle is greater than or equal to 45° and less than or equal to 135°. Understandably, the above stiffening rib plate 12 is inclined in the second direction, which can enhance the structural strength and force transmission effect of the first beam body 1.

[0056] It should be noted that the preset angles between the stiffening rib plate 12 and the two split beams 111 are different. The sum of the preset angle between the stiffening rib plate 12 and the side of one split beam 111 and the preset angle between the stiffening rib plate 12 and the side of the other split beam 111 is equal to 180°, but the preset angles are all within the range of 45° - 135°.

[0057] As Figure 3 and Figure 5 shown, in some embodiments, the expansion cross beam 10 further includes a plurality of third beam bodies 3 extending in the first direction and having a U shape. The third beam bodies 3 are connected to the second beam body 2 and form a cavity with the second beam body 2.

[0058] By providing the third beam body 3, a support structure can be provided for the BMS, busbar, and wiring harness, that is, the BMS, busbar, wiring harness, etc. can all be fixed on the third beam body 3.

[0059] Furthermore, the third beam body 3 and the second beam body 2 are integrally formed, that is, the third beam body 3 and the second beam body 2 are integrally processed and formed. The material of the third beam body 3 is the same as that of the second beam body 2, and it is formed by extrusion. In this way, the third beam body 3 can be formed by using a set of molds, which can reduce the number of molds and lower the cost.

[0060] As Figure 6 shown, this embodiment also provides a battery box, which includes a box body and the above-mentioned expansion crossbeam 10. The box body includes a bottom plate 20 and side beams 30 of multiple connecting plates at the bottom plate 20. The bottom plate 20 and multiple side beams 30 enclose a cavity for accommodating battery cells. The expansion crossbeam 10 is arranged in the cavity. Both ends of the main beam body 11 in the first direction are connected to the side beams 30. Both ends of the second beam body 2 in the first direction are connected to the side beams 30, and the second beam body 2 is connected to the bottom plate 20.

[0061] It should be noted that the bottom plate 20 of the box body can be a liquid cooling plate or a support plate that plays a role in supporting the battery cells.

[0062] Furthermore, in some embodiments, the above-mentioned first beam body 1 is connected to the side beam 30 by welding, with high connection strength and strong stability. Of course, in other embodiments, the first beam body 1 can also be connected to the side beam 30 through other structures.

[0063] Furthermore, the above-mentioned battery box further includes a connecting member 40, and the connecting member 40 is connected between the second beam body 2 and the side beam 30. Specifically, referring to Figure 6 , the above-mentioned connecting member 40 has a first connecting plate and a second connecting plate, wherein the first connecting plate is connected to the second beam body 2, and the second connecting plate is connected to the side beam 30.

[0064] Optionally, in some embodiments, the above-mentioned first connecting plate is connected to the second beam body 2 by riveting, and the second connecting plate is connected to the side beam 30 by riveting.

[0065] Optionally, in some embodiments, the above-mentioned connecting member 40 is a steel stamping part, with high structural strength, which improves the connection stability between the second beam body 2 and the side beam 30.

[0066] Furthermore, the above-mentioned battery box further includes a busbar support member (not shown in the figure), a BMS support member (not shown in the figure), and a wiring harness support member (not shown in the figure). The busbar support member, BMS support member, and wiring harness support member are all connected to the third beam body 3.

[0067] Understandably, at this time, the third beam body 3 functions to install the busbar support, the BMS support, and the wire harness support. Therefore, the requirement for its structural strength can be reduced. Thus, the third beam body 3 and the second beam body 2 are made of the same material.

[0068] This embodiment also provides a battery, including the above battery box. This battery has the technical effects of the expansion crossbeam in the above battery box embodiment, which will not be elaborated here.

[0069] This disclosure embodiment also provides a vehicle, including the above battery. This vehicle has the technical effects of the above battery embodiment, which will not be elaborated here.

[0070] It should be noted that in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0071] The above are only specific embodiments of the present disclosure, enabling those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to these embodiments described herein, but rather to the broadest scope consistent with the principles and novel features disclosed herein.

Claims

1. An expansion beam, characterized in that: The invention comprises a first beam body and a second beam body, wherein the first beam body comprises a main beam body and a reinforcing rib plate, wherein the main beam body and the second beam body both extend along a first direction and are hollow structures, wherein the main beam body is connected to the second beam body, wherein the reinforcing rib plate is arranged in a cavity of the main beam body, and wherein the reinforcing rib plate is connected between two side walls of the main beam body in a second direction, wherein the first direction is perpendicular to the second direction; After the expansion beam is installed in the battery box, the second beam body is close to the bottom plate of the box body relative to the main beam body.

2. The expansion beam according to claim 1, characterized in that: The material of the first beam body is steel, and the material of the second beam body is any one of aluminum, aluminum alloy and polymer materials.

3. The expansion beam according to claim 2, characterized in that: In the third direction, the height of the main beam is H1, and the height of the second beam is H2, wherein 1 / 2≤H1 / (H1+H2)≤2 / 3, and the third direction, the first direction, and the second direction are perpendicular to each other.

4. The expansion beam according to claim 1, characterized in that: The main beam body includes two U-shaped split beams, the two split beams are connected to form the cavity, and the reinforcing rib plate is connected to one of the split beams on one side in the second direction and connected to the other split beam on the other side.

5. The expansion beam according to claim 4, characterized in that: A preset angle is formed between the reinforcing rib plate and the side of each split beam, and the preset angle is greater than or equal to 45° and less than or equal to 135°.

6. The expansion beam according to claim 4, characterized in that: The split beam includes an integrally formed first beam plate, a second beam plate and a third beam plate. The first beam plate and the third beam plate are arranged opposite to each other. In the depth direction of the U-shaped cavity of the split beam, the height of the first beam plate is greater than the height of the third beam plate. The first beam plate of each split beam is connected to the third beam plate of another split beam.

7. The expansion beam according to claim 6, characterized in that: The first beam plate of each split beam is welded to the third beam plate of another split beam, and the reinforcing rib plate is welded to the first beam plate of each split beam. In the depth direction of the U-shaped cavity of the split beam, the weld between the first beam plate and the third beam plate is spaced a preset distance from the weld between the first beam plate and the reinforcing rib plate on the same side.

8. The expansion beam according to claim 1, characterized in that: The expansion beam further includes a plurality of third beam bodies extending along the first direction and in a U shape. The third beam bodies are connected to the second beam bodies and form a cavity between the third beam bodies and the second beam bodies.

9. The expansion beam according to claim 8, characterized in that: The second beam body and the plurality of third beam bodies are integrally formed.

10. A battery box, characterized in that: It comprises a box body and an expansion beam as described in any one of claims 1 to 9, wherein the box body comprises a bottom plate and a plurality of side beams connected to the bottom plate, the bottom plate and the plurality of side beams are arranged to form a receiving cavity for accommodating battery cells, the expansion beam is arranged in the receiving cavity, both ends of the main beam body in the first direction are connected to the side beams, both ends of the second beam body in the first direction are connected to the side beams, and the second beam body is connected to the bottom plate.

11. The battery case according to claim 10, characterized in that: The battery box also includes a connecting member, which is connected between the second beam body and the side beam.

12. The battery case according to claim 10, characterized in that: The expansion beam further includes a plurality of third beam bodies extending along the first direction and in a U shape, wherein the third beam body is connected to the second beam body and a cavity is formed between the third beam body and the second beam body; The battery box further includes a busbar support, a BMS support and a wiring harness support, and the busbar support, the BMS support and the wiring harness support are all connected to the third beam.

13. A battery, characterized in that: Comprising a battery case as described in any one of claims 10-12.

14. A vehicle, characterized in that: Comprising the battery of claim 13.

Images