Battery box body

Abstract

The utility model relates to the technical field of batteries, and discloses a battery box body which comprises an outer beam and an inner beam, the outer beams and the inner beams are collectively called box body beams; the box body beam is defined by wall plates, a cavity is formed by the wall plates in the defined area, the reinforcing beam is arranged in the cavity, and at least part of the area of the reinforcing beam abuts against the inner wall faces of the wall plates. According to the battery box body provided by the utility model, the box body beam is formed by enclosing the wall plates, the wall plates form the cavity in the enclosed area, the reinforcing beam is further arranged in the cavity of the box body beam, and at least part of the area of the reinforcing beam is propped against the inner wall surface of the wall plate, so that the effect of reinforcing the structure can be achieved to meet the high-standard requirement; therefore, when the battery box body is seriously impacted corresponding to the high standard requirement, the deformation can be effectively resisted, and the battery cells in the battery pack are protected. Meanwhile, the stiffening beams are arranged on the inner sides of the box body beams, so that the outer contour boundary of the whole package can be kept, and the airtightness of the whole package is not influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery box. Background Art

[0002] When the battery pack is squeezed by external force, the battery case needs to absorb the energy of the squeeze, reduce the impact on the battery cells inside the battery pack, and better protect the battery cells.

[0003] In the related art, when subjected to a severe impact, the box beam itself will undergo a significant deformation under high extrusion conditions and will be unable to protect the battery cells inside the battery pack. Utility Model Content

[0004] In view of this, the utility model provides a battery box to solve the problem that when subjected to a severe impact, the box beam is greatly deformed and cannot effectively protect the battery cell.

[0005] The utility model provides a battery box, comprising:

[0006] External beams, including a frame enclosing and forming a box body;

[0007] An inner beam is arranged inside the box body;

[0008] Definition: External beams and internal beams are collectively referred to as box beams;

[0009] The box beam is enclosed by wall panels, and the wall panels form a cavity in the enclosed area, and the thickness S of the wall panels satisfies S≤2mm;

[0010] The battery box also includes: a reinforcing beam, which is arranged in the cavity, and at least a part of the reinforcing beam abuts against the inner wall surface of the wall plate.

[0011] Beneficial effect: The battery box provided by the embodiment of the utility model has a box beam enclosed by wall panels, and the wall panels form a cavity in the enclosed area. By further arranging a reinforcing beam inside the cavity of the box beam, and at least part of the reinforcing beam abutting against the inner wall surface of the wall panel, the structure can be reinforced to meet high standards, so that when the battery box is subjected to a severe impact corresponding to the high standards, it can effectively resist deformation and protect the battery cells inside the battery pack. At the same time, because the reinforcing beam is arranged on the inner side of the box beam, it can maintain the outer contour boundary of the whole package without affecting the airtightness of the whole package. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the specific implementation methods of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a top view of the battery box of the utility model;

[0014] Figure 2 for Figure 1 Partial schematic diagram of the AA section;

[0015] Figure 3 It is a schematic diagram of the inner beam and the reinforcing beam;

[0016] Figure 4 for Figure 1 A partial schematic diagram of the middle BB section;

[0017] Figure 5 It is a partial exploded schematic diagram of the battery box of the utility model;

[0018] Figure 6 for Figure 5 Enlarged view of point C.

[0019] Description of reference numerals:

[0020] 100. Box body; 1. External beam; 11. Frame; 12. Mounting beam; 2. Internal beam; 3. Reinforcement beam; 4. Connector; 5. Welding mark; 6. Cavity; 7. Clearance hole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] When the battery pack is squeezed by external force, the battery box needs to absorb the squeezed energy, reduce the impact on the internal cells of the battery pack, and better protect the cells. The conventional battery box designed according to the national standard requirements can meet the national standard requirements and can also absorb the squeezed energy of the battery pack, reduce the impact on the internal cells of the battery pack, and protect the cells.

[0026] However, for battery cases with higher standards, such as battery cases that are twice as high as the national standard, battery cases with conventional structures cannot meet these high standards. When the battery case is subjected to a severe impact corresponding to the high standards, the beam structure of the battery case will deform significantly under higher extrusion conditions and will be unable to protect the battery cells inside the battery pack.

[0027] The battery box provided in the embodiment of the utility model can play a role in structural reinforcement to meet high standards; at the same time, since the welding position of the reinforcement beam in the frame is on the inside, it can maintain the outer contour boundary of the whole package without affecting the airtightness of the whole package.

[0028] Combine the following Figures 1 to 6 , describing an embodiment of the utility model.

[0029] According to an embodiment of the utility model, a battery box is provided, comprising:

[0030] An external beam 1, the external beam 1 includes a frame 11 enclosing and forming a box body 100;

[0031] The inner beam 2 is arranged inside the box body 100;

[0032] Define that the outer beam 1 and the inner beam 2 are collectively referred to as the box beam;

[0033] The box beam is enclosed by wall panels, and the wall panels form a cavity 6 in the enclosed area, and the thickness S of the wall panels satisfies S≤2mm;

[0034] The battery box further includes: a reinforcing beam 3, which is disposed in the cavity 6, and at least a portion of the reinforcing beam 3 abuts against the inner wall surface of the wall panel.

[0035] The external beam 1 may further include a mounting beam 12 disposed on the outer periphery of the box body 100 . In this embodiment, the mounting beam 12 may also be provided with a reinforcing beam 3 .

[0036] The box body 100 is formed by a plurality of frames 11 connected end to end to enclose each other, and a receiving cavity suitable for receiving batteries is formed inside the box body 100.

[0037] By providing the inner beam 2 inside the box body 100, the structural strength of the box body 100 can be improved, the torsional deformation can be reduced, and the box body 100 can be divided into multiple areas to facilitate the arrangement of battery packs and electrical components.

[0038] After the battery box of this embodiment contains the battery pack to form a power supply unit, the battery box is connected to the power-consuming equipment to supply power to the power-consuming equipment, which may include electric vehicles, motorcycles, trucks, engineering vehicles, ships, airplanes, etc.

[0039] This embodiment takes an electric vehicle as an example. To facilitate the installation of the battery box on the electric vehicle, a mounting beam 12 is provided on the outer periphery of the box body 100, and the mounting beam 12 is fixed to the frame of the electric vehicle through a mounting connector, thereby realizing the assembly of the battery box. Since the mounting beam 12 bears the load, the structural strength of the mounting beam 12 needs to be ensured.

[0040] The box beam includes an outer beam 1 and an inner beam 2 , and the outer beam 1 further includes a frame 11 and a mounting beam 12 .

[0041] Combination Figure 2 As shown, the box beam is enclosed by wall panels, and the wall panels form a cavity 6 in the enclosed area. In the actual production process, the box beam is formed by roll forming; roll forming relies on the plastic movement characteristics of the material and adopts the principle of rolling extrusion to form the product. It not only has high production efficiency and saves materials, but also has high product strength and stable quality.

[0042] By further arranging the reinforcing beam 3 inside the cavity 6 of the box beam, and at least a part of the reinforcing beam 3 abutting against the inner wall surface of the wall panel, when facing collision or extrusion deformation, the presence of the reinforcing beam 3 can further improve the structural strength of the whole formed by the box beam and the reinforcing beam 3, and effectively resist deformation.

[0043] The battery box provided by the embodiment of the utility model has a box beam enclosed by wall panels, and the wall panels form a cavity 6 in the enclosed area. By further arranging a reinforcing beam 3 inside the cavity 6 of the box beam, and at least a part of the reinforcing beam 3 abutting against the inner wall surface of the wall panel, the structure can be reinforced to meet the high standard requirements, so that the battery box can effectively resist deformation when subjected to a severe impact corresponding to the high standard requirements, and protect the battery cells inside the battery pack. At the same time, because the reinforcing beam 3 is arranged on the inner side of the box beam, the outer contour boundary of the whole package can be maintained without affecting the airtightness of the whole package.

[0044] In some embodiments, the box beam is formed by roll forming; the reinforcing beam 3 is formed by profile extrusion.

[0045] Roll forming relies on the plastic movement characteristics of materials and uses the principle of rolling extrusion to form parts. It not only has high production efficiency and saves materials, but also has high product strength and stable quality.

[0046] Profile extrusion is a process that shapes metal billets into various shapes and sizes by applying pressure. The formed profiles have the characteristics of high strength, light weight and corrosion resistance.

[0047] As a variation, the internal reinforcing beam 3 may also be roll-formed, so that the reinforcing beam 3 forms a C-shaped structure, and a notch is formed at the opening of the C-shape to facilitate assembly.

[0048] In some embodiments, the wall thickness of the reinforcing beam 3 is defined as R, which satisfies: 1 mm ≤ R ≤ 3 mm.

[0049] As an optional embodiment, the wall thickness R of the reinforcing beam 3 may be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, etc.

[0050] Furthermore, the ratio of the wall thickness R of the reinforcing beam 3 to the thickness S of the wall plate of the box beam satisfies: 0.83≤R / S≤2.5.

[0051] In some embodiments, in combination Figure 2 As shown, the extension direction of the reinforcing beam 3 is parallel to the extension direction of the box beam;

[0052] At least two end surfaces of the outer periphery of the reinforcing beam 3 are respectively in contact with the inner wall surface of the box beam.

[0053] In some embodiments, the cross-sectional profile of the reinforcing beam 3 perpendicular to the extension direction may be a rectangular, hexagonal, irregular, etc. Here, the cross-sectional profile of the reinforcing beam 3 perpendicular to the extension direction is a rectangular as an example.

[0054] By making at least two end faces of the outer periphery of the reinforcing beam 3 abut against the inner wall surface of the box beam respectively, the contact area between the reinforcing beam 3 and the box beam can be ensured, and further combined Figure 2 As shown, the two opposite end faces of the reinforcing beam 3 are in contact with the inner wall surface of the box beam, so that the reinforcing beam 3 supports the inner wall surfaces on both sides of the box beam, the force is more reasonable, the supporting effect is better, and the box beam is prevented from intruding too much after the collision. In addition, after at least two end faces of the outer periphery of the reinforcing beam 3 are respectively in contact with the inner wall surface of the box beam, the intruding water vapor can be prevented from spreading to the cavity 6 in the entire box beam, thereby playing an anti-corrosion role and improving safety performance.

[0055] In some embodiments, in combination Figure 2 , Figure 3 As shown, at least two reinforcing beams 3 are arranged in the cavity 6 enclosed by the same box beam.

[0056] By arranging at least two reinforcing beams 3 in the cavity 6 formed by the same box beam, the cavity 6 has a plurality of dispersed reinforcing beams, which can better fit the space in the box beam while strengthening the structural strength, and conveniently avoid other parts in the cavity, such as lifting holes, bolts, etc., to facilitate assembly.

[0057] As a variation, combined Figure 4 As shown, only one reinforcing beam 3 is provided in the mounting beam 12, and along the force direction of the mounting beam 12, that is, the Z direction, both sides of the reinforcing beam 3 along the Z direction are in contact with the inner wall surface of the mounting beam 12. Thus, the mounting beam 12 is well supported and the structural strength of the mounting beam 12 is ensured.

[0058] In some embodiments, the height of the box beam along the Z direction is defined as H, and the minimum spacing between two adjacent reinforcing beams 3 is defined as T, satisfying: 0≤T / H≤0.9.

[0059] In some embodiments, in combination Figure 3 , Figure 4 As shown, when only one reinforcing beam 3 is arranged in the cavity 6 enclosed by the same box beam, the height of the box beam along the Z direction is defined as H, and the height of the end surface where the reinforcing beam 3 and the box beam abut against each other along the Z direction is defined as D, satisfying: 0.1≤D / H≤1;

[0060] And / or, when at least two reinforcing beams 3 are arranged in the cavity 6 enclosed by the same box beam, the at least two reinforcing beams 3 are arranged along the Z direction, the height of the box beam along the Z direction is defined as H, and the sum of the heights of the end faces where the at least two reinforcing beams 3 and the box beam abut against each other along the Z direction is defined as D0, satisfying: 0.1≤D0 / H≤1.

[0061] When only one reinforcing beam 3 is arranged in the cavity 6 enclosed by the same box beam, by limiting the lower limit of the ratio of the height D of the end face where the reinforcing beam 3 and the box beam are in contact along the Z direction to the height H of the box beam along the Z direction, it is possible to avoid insufficient structural strength due to the reinforcing beam 3 being too small. At the same time, limiting the upper limit can avoid the situation where the reinforcing beam 3 is too large and not conducive to weight reduction, and that the reinforcing beam 3 is too large to be conducive to efficient assembly with the box beam.

[0062] When at least two reinforcing beams 3 are arranged in the cavity 6 enclosed by the same box beam, Figure 3 As shown, taking the number of reinforcing beams 3 as an example, the height of the end face where one reinforcing beam 3 abuts the box beam along the Z direction is D1, and the height of the end face where the other reinforcing beam 3 abuts the box beam along the Z direction is D2, then the sum of the heights of the end faces where at least two reinforcing beams 3 abut the box beam along the Z direction D0=D1+D2.

[0063] By limiting the lower limit of the ratio of the sum of the heights D0 of the end faces of at least two reinforcing beams 3 abutting the box beam along the Z direction to the height H of the box beam along the Z direction, it is possible to avoid insufficient structural strength due to the reinforcing beam 3 being too small. At the same time, limiting the upper limit can avoid the situation where the reinforcing beam 3 is too large and not conducive to weight reduction, and the reinforcing beam 3 is too large to be conducive to efficient assembly with the box beam.

[0064] In some embodiments, the material hardness of the reinforcing beam 3 is greater than the material hardness of the box beam.

[0065] In some embodiments, the material of the box beam includes: steel or aluminum or aluminum alloy;

[0066] The material of the reinforcing beam 3 includes: carbon steel or alloy steel.

[0067] In some embodiments, the reinforcing beam 3 is a solid structure; or, the reinforcing beam 3 includes an outer peripheral wall and a hollow area formed inside the outer peripheral wall.

[0068] In this embodiment, the reinforcing beam 3 preferably adopts a peripheral wall structure with a hollow area, so as to better reduce the weight of the battery box and ensure the energy density while ensuring the structural strength.

[0069] In some embodiments, the box beam is formed with a through hole, and the reinforcing beam 3 is provided with a mounting hole;

[0070] The battery box also includes a connector 4 , which passes through the through hole and the mounting hole in sequence to connect the box beam and the reinforcing beam 3 .

[0071] By aligning the through hole of the box beam with the mounting hole of the reinforcing beam 3 and passing the connecting member 4 through the through hole and the mounting hole in sequence, the corresponding positions of the box beam and the reinforcing beam 3 can be fixed, which facilitates subsequent welding operations.

[0072] As a variation, a positioning portion is formed on the box beam, and a positioning hole is correspondingly opened on the reinforcement beam, wherein the positioning portion can be a positioning rod or a positioning protrusion, and the positioning portion cooperates with the positioning hole to position the reinforcement beam for subsequent welding operations. In the specific operation process, since the outer contour size of the reinforcement beam is smaller than the cavity size of the box beam, the reinforcement beam can be first inserted at a position that does not interfere with the box beam, and then the reinforcement beam can be gradually sent into the box beam to move the reinforcement beam to the position of the positioning portion.

[0073] In some embodiments, in combination Figure 5 , Figure 6 As shown, the box beam is provided with a clearance hole 7, and the projection of the clearance hole 7 toward the reinforcing beam 3 overlaps with the reinforcing beam 3;

[0074] The box beam is connected to the reinforcing beam 3 by welding, and a welding mark 5 is formed at the clearance hole 7.

[0075] By opening a clearance hole 7 in the box beam, and the projection of the clearance hole 7 toward the reinforcing beam 3 overlaps with the reinforcing beam 3, after the box beam and the reinforcing beam 3 are assembled, welding is performed at the clearance hole 7 to form a weld mark 5, so that the box beam and the reinforcing beam 3 are welded and fixed to ensure that the two connections are firm.

[0076] In some embodiments, in combination Figure 5 , Figure 6 As shown, the clearance hole 7 comprises an elongated hole, and the extending direction of the elongated hole is parallel to the extending direction of the box beam or is arranged at an acute angle.

[0077] In this embodiment, the extending direction of the elongated hole is parallel to the extending direction of the box beam.

[0078] In some embodiments, the number of the elongated holes is multiple;

[0079] In a plane parallel to the wall surface of the box beam where the clearance holes 7 are opened and perpendicular to the extending direction of the long holes, a plurality of long holes are arranged in parallel and at intervals.

[0080] By providing a plurality of elongated holes, the welding effect can be ensured and the connection strength between the box beam and the reinforcing beam 3 can be improved.

[0081] Obviously, the above embodiments are only examples for clear explanation, and are not intended to limit the implementation methods. Although the embodiments of the present utility model are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present utility model, and such modifications and variations are all within the scope defined by the present utility model.

Claims

1. A battery box, characterized in that: include: An external beam (1), the external beam (1) comprising a frame (11) enclosing and forming a box body (100); An inner beam (2) is arranged inside the box body (100); The outer beam (1) and the inner beam (2) are collectively referred to as a box beam; The box beam is enclosed by wall panels, and the wall panels form a cavity (6) in the enclosed area, and the thickness S of the wall panels satisfies S≤2mm; The battery box further comprises: a reinforcing beam (3) which is arranged in the cavity (6), and at least a part of the reinforcing beam (3) abuts against the inner wall surface of the wall plate.

2. The battery box according to claim 1, characterized in that: The wall thickness of the reinforcing beam (3) is defined as R, which satisfies: 1 mm ≤ R ≤ 3 mm.

3. The battery box according to claim 1, characterized in that: The extension direction of the reinforcing beam (3) is parallel to the extension direction of the box beam; At least two end surfaces of the outer periphery of the reinforcing beam (3) are respectively in contact with the inner wall surface of the box beam.

4. The battery box according to claim 1, characterized in that: At least two reinforcing beams (3) are arranged in the cavity (6) enclosed by the same box beam.

5. The battery box according to claim 4, characterized in that: The height of the box beam along the Z direction is defined as H, and the minimum spacing between two adjacent reinforcing beams (3) is defined as T, satisfying the following: 0≤T / H≤0.

9.

6. The battery box according to claim 1, characterized in that: When only one reinforcing beam (3) is arranged in the cavity (6) enclosed by the same box beam, the height of the box beam along the Z direction is defined as H, and the height of the end surface where the reinforcing beam (3) and the box beam abut against each other along the Z direction is defined as D, satisfying the following: 0.1≤D / H≤1; And / or, when at least two reinforcing beams (3) are arranged in the cavity (6) enclosed by the same box beam, the at least two reinforcing beams (3) are arranged along the Z direction, the height of the box beam along the Z direction is defined as H, and the sum of the heights of the end faces of the at least two reinforcing beams (3) abutting against the box beam along the Z direction is defined as D0, satisfying: 0.1≤D0 / H≤1.

7. The battery case according to any one of claims 1 to 6, characterized in that: The material hardness of the reinforcing beam (3) is greater than the material hardness of the box beam.

8. The battery case according to claim 7, characterized in that: The material of the box beam includes: steel or aluminum or aluminum alloy; The material of the reinforcing beam (3) includes: carbon steel or alloy steel.

9. The battery box according to claim 2, characterized in that: The ratio of the wall thickness R of the reinforcing beam (3) to the thickness S of the wall plate of the box beam satisfies: 0.83≤R / S≤2.

5.

10. The battery case according to any one of claims 1 to 6, characterized in that: The reinforcing beam (3) is a solid structure; or, the reinforcing beam (3) comprises an outer peripheral wall and a hollow area formed inside the outer peripheral wall.

11. The battery case according to any one of claims 1 to 6, characterized in that: The box beam is formed with a through hole, and the reinforcing beam (3) is provided with a mounting hole; The battery box body also includes a connecting piece (4), and the connecting piece (4) passes through the through hole and the mounting hole in sequence to connect the box body beam and the reinforcing beam (3).

12. The battery case according to any one of claims 1 to 6, characterized in that: The box beam is provided with a clearance hole (7), and the projection of the clearance hole (7) toward the reinforcing beam (3) overlaps with the reinforcing beam (3); The box beam is connected to the reinforcing beam (3) by welding, and a welding mark (5) is formed at the clearance hole (7).

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