Box body, battery pack and vehicle

Abstract

The utility model relates to the technical field of batteries, in particular to a box body, a battery pack and a vehicle, the box body comprises an edge beam and a frame, the frame defines a battery containing space, the edge beam is connected to the outer side of the frame, and the edge beam comprises a first beam body and a second beam body; wherein the first beam body is a rolling part made of a first plate, the second beam body is a rolling part made of a second plate, the second beam body is arranged in the first beam body, part of the outer wall of the second beam body is not attached to the inner wall of the first beam body, and an energy absorption cavity is formed. According to the battery box disclosed by the utility model, the strength is enhanced due to the double layers of the rolling edge beams and the design of the energy absorption cavities, and the battery pack has an enough collision protection function.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and specifically provides a battery pack housing, a battery pack, and a vehicle. Background Art

[0002] With the continuous increase in the promotion of new energy vehicles in China, as one of the core components of new energy vehicles, the side beams of the battery pack housing are important load-bearing and strength structural members. In the prior art, the side beam structure of the battery pack is complex in design and high in manufacturing cost;

[0003] In addition, in the design of the side beam structure of the existing battery pack tray, in order to enhance the strength of the beam body, multiple chambers separated by reinforcing ribs are usually arranged in the beam body. The design of multiple chambers can effectively collapse and absorb energy when the vehicle encounters a collision to effectively cope with the impact, but the structure of multiple chambers is complex, especially when it is manufactured by the rolling process, which is not conducive to the design of the rolling scheme.

[0004] In view of this, it is urgent to propose a technical solution to solve the above technical problems. Summary of the Utility Model

[0005] The present application aims to solve the above technical problems, that is, the problem of the lack of design strength and reliability of the conventional rolled side beam.

[0006] In a first aspect, the present application provides a battery pack housing, including side beams and a frame. The frame encloses a receiving space for the battery. The side beams are connected to the outside of the frame. The side beams include a first beam body and a second beam body. Among them, the first beam body is a rolled part made of a first plate, and the second beam body is a rolled part made of a second plate. The second beam body is arranged inside the first beam body, and a part of the outer wall of the second beam body does not fit against the inner wall of the first beam body, forming an energy absorption chamber.

[0007] In an optional technology of the present utility model, the size of the energy absorption chamber on the side close to the first beam body is larger than the size of the energy absorption chamber on the side close to the second beam body.

[0008] In an optional technology of the present utility model, the bottom of the first beam body is riveted to the bottom of the second beam body.

[0009] In an optional technology of the present utility model, the first beam body includes a first wall, a third wall, a second wall, a fourth wall, and a first flanging connected in sequence. The first wall is connected to the frame, and the second wall is opposite to the first wall. The first flanging bends outward from the end of the fourth wall and is connected to the first wall.

[0010] In an alternative technology of the present utility model, the energy absorption cavity includes a first energy absorption cavity; a part of the outer wall of the second beam body does not fit with the inner walls of the first wall and the second wall, forming the first energy absorption cavity, and the size of the non-fitting inner wall accounts for 50%-65% of the first wall or the second wall.

[0011] In an alternative technology of the present utility model, the energy absorption cavity further includes a second energy absorption cavity. A part of the outer wall of the second beam body does not fit with the inner walls of the third wall and the fourth wall, forming the second energy absorption cavity.

[0012] In an alternative technology of the present utility model, the first beam body includes connecting sections located at both ends of the first beam body and a reinforcing section located in the middle of the first beam body; the second beam body is arranged in the reinforcing section, the second wall is not provided on the connecting section, and a connecting hole is provided on the first wall for connecting the side beam to the frame through a connecting piece.

[0013] In an alternative technology of the present utility model, the first plate and the second plate are steel plates with a thickness of 0.8 mm to 1.5 mm.

[0014] In a second aspect, the present application provides a battery pack including the box body according to any one of the above technologies.

[0015] In a third aspect, the present application provides a vehicle including the above battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings:

[0017] Figure 1 is a schematic structural diagram of a box body of the present utility model application;

[0018] Figure 2 is a schematic cross-sectional view of an embodiment of a side beam of the present utility model application;

[0019] Figure 3 is a schematic cross-sectional view of another embodiment of the side beam of the present utility model application;

[0020] Figure 4 is a schematic structural diagram of a side beam of a box body of the present utility model application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present application and are not intended to limit the protection scope of the present application. Those skilled in the art can adjust them as needed to adapt to specific application scenarios.

[0022] It should be noted that in the description of the present application, the terms indicating the direction or positional relationship such as "upper", "lower", "left", "right", etc. are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0023] In addition, it should also be noted that in the description of the present application, unless otherwise clearly specified and limited, the terms "connected", "connected to", "communicated with" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0024] As Figure 1 and Figure 2 shown, this embodiment discloses a battery pack box body, including a side beam 1. The side beam 1 includes: a first beam body 11 and a second beam body 12; wherein, both the first beam body 11 and the second beam body 12 are roll-formed parts made of independent whole sheets of plate; and the second beam body 12 is arranged inside the first beam body 11. The second beam body 12 is provided with a recess recessed into itself. At the position of the recess, the outer wall of the second beam body 12 does not fit against the inner wall of the first beam body 11, forming an energy absorption cavity 13 to absorb the energy when the side beam 1 encounters an impact.

[0025] Specifically, from the overall view of the side beam 1, that is, a part of the outer wall of the second beam body 12 does not fit against the inner wall of the first beam body 11, forming the above-mentioned energy absorption cavity 13.

[0026] The side beam 1 in the present utility model is applied to be installed on the outside of the frame 2 of the battery pack box body for installing the battery pack to a vehicle, and is generally symmetrically arranged on both sides of the battery pack. The frame 2 encloses a battery pack accommodation cavity.

[0027] As an alternative solution, as Figure 2 shown, the size of the side of the energy absorption cavity 13 close to the first beam body 11 is larger than the size of the side of the energy absorption cavity 13 close to the second beam body 12, that is, the cavity of the energy absorption cavity 13 gradually becomes smaller from the wall surface of the first beam body 11 towards its interior.

[0028] As Figure 2As shown, the first beam body 11 has a first wall 111 adjacent to the frame 2, and a second wall 112 opposite to the first wall 111; a third wall 113 is located above, and a fourth wall 114 is located below. At the same time, for the second beam body 12, a fifth wall 121 corresponds to the first wall 111, a sixth wall 122 corresponds to the second wall 112; a seventh wall 123 corresponds to the third wall 113, and an eighth wall 124 corresponds to the fourth wall 114.

[0029] Of course, due to the roll-forming process, the transitions between the adjacent walls of the present utility model all have an arc structure.

[0030] As an optional solution, the dimensions of the third wall 113 and the fourth wall 114 in the illustrated cross-section are larger than the dimensions of the first wall 111 and the second wall 112 in the cross-section. Correspondingly, the dimensions of the seventh wall 123 and the eighth wall 124 in the illustrated cross-section are also larger than the dimensions of the fifth wall 121 and the sixth wall 122 in the cross-section. This design enables better buffer space and structural strength in the installation direction of the side beam when dealing with impacts.

[0031] As an optional solution, since the first wall 111 is adjacent to the frame 2 of the battery pack, the first beam body 11 further includes a first flanging 115. Taking the first wall 111 as the starting section of the first plate, the first flanging 115 can be regarded as the end of the first plate, which is connected to the fourth wall 114 and is formed by bending the first plate outward from the end of the fourth wall 114.

[0032] The design of the longer first wall 111 and the first flanging 115 can make the connection between the first wall 111 and the frame 2 more stable. Especially when being impacted from the side, it can resist the overall downward bending of the side beam 1.

[0033] At the same time, for the roll-forming process, the design of the first beam connected to the first flanging 115 is easier to implement than the closed connection method of the first beam body 11 at any wall, and it is easier to maintain the shape stability after production.

[0034] Optionally, the edge of the first flanging 115 is flush with the edge of the first wall 111. It can be considered that the first wall 111, and the vertical dimension of the first wall 111 is equal to the vertical dimension of the second wall 112 plus the vertical dimension of the first flanging 115. In this way, the first beam body 11 corresponds to the first and last at this position, and the structure is more flat.

[0035] Such as Figure 2As shown, when viewed from a cross-section perpendicular to the third direction, the fifth wall 121 and the sixth wall 122 are concave towards the second beam body 12, so that the inner walls of the first wall (111) and the second wall (112) do not fit with part of the outer walls of the upper fifth wall 121 and the sixth wall 122, forming a first energy absorption cavity 131. The first energy absorption cavity 131 extends along the side beam 1. The cross-sectional shape of the first energy absorption cavity 131 is recognized as a "trapezoid": having a longer first base, a shorter second base, and a waist transitioning from the first base to the second base, with the first base and the second base being parallel; the first base is the line segment corresponding to the inner wall of the first beam body 11 in this cross-section, the second base is the line segment corresponding to the outer wall of the first energy absorption cavity 131 of the second beam body 12 that is parallel to the inner wall of the first beam body 11 in this cross-section, and the waist is the line segment corresponding to the outer wall of the first energy absorption cavity 131 during the inward concave transition stage of the first energy absorption cavity 131 in this cross-section.

[0036] Of course, due to the roll-forming process, the wall surfaces on the second beam body 12 belong to the transition between the waist and the second base of the first energy absorption cavity 131 and all have an arc-shaped structure.

[0037] As an alternative embodiment of the present invention, the "trapezoid" is an "isosceles trapezoid", that is, the energy absorption cavity is a symmetric structure. That is to say, the concave shape of the first energy absorption cavity 131 on the second beam body 12 is symmetric.

[0038] Of course, the cross-section of the above first energy absorption cavity 131 as Figure 2 shown is approximately trapezoidal in its own embodiment, but this cross-section can also be a semi-circle, or a shape including a conic curve, as long as the first energy absorption cavity 131 gradually becomes smaller from the first beam body towards its interior, it should be considered to conform to the design in the present invention.

[0039] For the roll-forming processing method, a "trapezoid" with more straight line segments is more convenient for processing: only need to perform roll-forming and bending at the corner positions, while curves require continuous roll-forming and bending.

[0040] As an alternative scheme, the size of the first energy absorption cavity 131 on the side close to the second beam body 12 is 30% - 80% of the size of the first energy absorption cavity 131 on the side close to the first beam body 11. From Figure 2 the cross-sectional view shown, that is, the length of the second base is 30% - 80% of the length of the first base.

[0041] As an alternative scheme, the first wall 111 or the second wall 112 enclosing the energy absorption cavity does not fit with part of the outer wall of the second beam body, and the inner wall without the fitting relationship only accounts for 50% - 65% of the first wall 111 or the second wall 112 where it is located. Specifically, as an example, from Figure 2 the cross-sectional view shown, that is, the length of the first base accounts for 50% - 65% of the first wall 111 or the second wall 112 where it is located

[0042] As an alternative, as Figure 2 shown, the bottom of the first beam body 11 is riveted to the bottom of the second beam body 12, that is, the fourth wall 114 of the first beam body 11 and the eighth wall 124 of the second beam body 12 are riveted by rivets to realize the fixed connection between the first beam body 11 and the second beam body 12.

[0043] As Figure 3 shown, in addition, similar to the first energy absorption cavity 131, the seventh wall 123 and the eighth wall 124 on the second beam body 12 are recessed inward so that the inner walls of the third wall 113 and the fourth wall 114 do not fit with the partial outer walls of the corresponding seventh wall 123 and eighth wall 124, forming a second energy absorption cavity 132. The second energy absorption cavity 132 is located on both sides of the second beam body 12 in the vertical direction. Since the horizontal dimension of the side beam 1 is larger than the vertical dimension, and at the same time the second energy absorption cavity 132 should not conflict with the first energy absorption cavity 131, the size of the second energy absorption cavity 132 is significantly smaller than that of the first energy absorption cavity 131 to play an auxiliary energy absorption role when being impacted.

[0044] As an alternative, the first beam body 11 includes a connection section 117 and a reinforcement section 116; the second beam body 12 is located inside the reinforcement section 116, and the connection section 117 is located at both ends of the reinforcement section 116 in the third direction, that is, the length of the first beam body 11 in the extending direction is greater than that of the second beam body 1. The second beam body 12 is located in the middle part of the first beam body 11 in the third direction to enhance the side beam 1 to cope with the collapse during impact. A connection hole is provided on the first wall 111 of the connection section 117 for installing the side beam 1 to the frame 2 of the battery pack through a connecting piece; the connecting piece can be a rivet or a bolt optionally. By providing the connection section 117, the installation hole only exists on the first wall 111 of the first beam body 11, and the fifth wall 121 of the second beam body 12 does not need to be provided with a connection hole, and the structural strength of the second beam body 12 is better guaranteed.

[0045] As an alternative, the connection section 117 of the first beam body 11 is not a completely closed structure, which is equivalent to not providing the second wall 112 for the connection section 117. In this way, the inner wall surface of the first wall 111 of the connection section 117 is directly exposed to the outside, and the connecting piece can be installed more conveniently.

[0046] Optionally, as Figure 4As shown, the length of the first beam body in the third direction is greater than that of the second beam body. The second beam body is arranged in the middle of the first beam body in the third direction. The part of the first beam body that contains the second beam body inside is the strengthening section 116, and the parts at both ends that do not contain the second beam body are the connecting sections 117. By machining, a straight cut is made from the end of the second wall 112 of the strengthening section 116 to the end of the first wall 111 of the connecting section 117. In this way, the third wall 113 and the fourth wall 114 of the first beam body 11 are trapezoidal as a whole. In this way, the inner wall surface of the first wall 111 of the connecting section 117 is directly exposed to the outside, and the side beam 1 can be installed from this side using the connecting holes.

[0047] As an optional solution of the present utility model, both the first plate and the second plate are steel plates with a thickness of 0.8 mm to 1.5 mm. The optional yield strength of the steel plate is above 1370 MPa, and the tensile strength is high-strength steel of 1620 MPa. The steel plate with this thickness can well realize the rolling process and also ensure that the manufactured side beam has good strength.

[0048] The present utility model also provides a battery pack having the above box body and a vehicle using the battery pack. The beneficial effects of the battery pack and the vehicle are the same as the advantages of the battery in this embodiment compared with the prior art, and will not be elaborated here.

[0049] So far, the technical solutions of the present application have been described in combination with the preferred embodiments shown in the drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present application is obviously not limited to these specific embodiments. Without departing from the principle of the present application, those skilled in the art can make equivalent changes or replacements to the relevant technical features, and the technical solutions after these changes or replacements will all fall within the protection scope of the present application.

Claims

1. A box for a battery pack, characterized in that: The box body comprises a side beam (1) and a frame (2), wherein the frame (2) encloses a battery storage space, the side beam (1) is connected to the outside of the frame, and the side beam (1) comprises a first beam body (11) and a second beam body (12); wherein: The first beam body (11) is a rolled part made of a first plate material, the second beam body (12) is a rolled part made of a second plate material, the second beam body (12) is arranged inside the first beam body (11), and part of the outer wall of the second beam body (12) does not fit the inner wall of the first beam body (11), so as to form an energy absorption cavity (13).

2. The box according to claim 1, characterized in that: The size of the energy absorbing cavity on a side close to the first beam body is greater than the size of the energy absorbing cavity on a side close to the second beam body.

3. The box according to claim 1, characterized in that: The bottom of the first beam body (11) is riveted to the bottom of the second beam body (12).

4. The box according to claim 1, characterized in that: The first beam body (11) comprises a first wall (111), a third wall (113), a second wall (112), a fourth wall (114) and a first flange (115) which are connected in sequence; The first wall (111) is connected to the frame (2); the second wall (112) is opposite to the first wall (111); the first flange (115) is bent outward from the end of the fourth wall (114) and connected to the first wall (111).

5. The box according to claim 4, characterized in that: The energy absorbing cavity (13) comprises a first energy absorbing cavity (131); a portion of the outer wall of the second beam body (12) is not in contact with the inner walls of the first wall (111) and the second wall (112), thereby forming the first energy absorbing cavity (131), and the size of the non-conforming inner wall accounts for 50%-65% of the first wall (111) or the second wall (112).

6. The box according to claim 5, characterized in that: The energy absorption cavity (13) further comprises a second energy absorption cavity (132), and part of the outer wall of the second beam body (12) is not in contact with the inner walls of the third wall (113) and the fourth wall (114), thereby forming the second energy absorption cavity (132).

7. The box according to claim 4, characterized in that: The first beam body (11) comprises connecting sections (117) located at both ends of the first beam body (11), and a reinforcing section (116) located in the middle of the first beam body (11); The second beam body (12) is arranged in the reinforcement section (116), the connecting section (117) is not provided with the second wall (112), and the first wall (111) is provided with a connecting hole for connecting the side beam (1) to the frame (2) through a connecting piece.

8. The box according to any one of claims 1 to 7, characterized in that: The first plate and the second plate are steel plates with a thickness of 0.8 mm to 1.5 mm.

9. A battery pack, characterized in that: A box comprising the box according to any one of claims 1 to 8.

10. A vehicle, characterized in that: Comprising the battery pack as claimed in claim 9.

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