Edge beam, lower box body assembly with edge beam and battery pack

Abstract

The utility model discloses an edge beam, a lower box body assembly with the edge beam and a battery pack, the edge beam is a bending piece and comprises a first bending section, the first bending section extends along a first direction and comprises a first plate section and a second plate section, and one end of the first plate section is connected with one end of the second plate section; the two ends of the second bending section are connected with the two ends, in the first direction, of the first plate section correspondingly, and the second bending section and the first plate section are matched to define a first cavity with the rectangular section; the third bending section is matched with the second bending section and the second plate section to define a second cavity, and the second plate section obliquely extends away from the third bending section in the direction from one end of the second plate section to the other end of the second plate section. The boundary beam disclosed by the utility model is simple in structure and convenient to process and manufacture, so that the boundary beam has good structural strength, and the operation stability and the safety performance of the battery pack are better.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a kind of side beam and the lower box assembly and battery pack with it. BACKGROUND

[0002] The side beam in battery pack provides fixed position for the assembly and fixation of battery pack in whole vehicle, and its structural strength has important influence on the running stability of battery pack in vehicle, currently, battery pack side beam structure is mostly adopted aluminum alloy profile tailor-welding, aluminum alloy casting etc. scheme to well meet the lightweight demand of battery pack, but structural strength is lower, and processing difficulty is big, so that the safety performance and running stability of battery pack are not good. SUMMARY

[0003] The utility model at least solves one of the technical problems existing in the prior art. To this end, the utility model provides a kind of side beam, the side beam can well reduce processing difficulty and have good structural strength, so that battery pack can have better safety performance and running stability is better.

[0004] The utility model further provides a kind of lower box assembly with the above-mentioned side beam.

[0005] The utility model further provides a kind of battery pack with the above-mentioned lower box assembly.

[0006] According to the side beam of the first aspect of the utility model, the lower box for battery pack, the side beam is bent piece and includes: first bent section, the first bent section extends along first direction and includes first plate section and second plate section, one end of the first plate section is connected with one end of the second plate section;Second bent section, both ends of the second bent section are connected with both ends of the first plate section along the first direction respectively, the second bent section cooperates with the first plate section to define the first cavity with rectangular cross section;Third bent section, the third bent section cooperates with the second bent section and the second plate section to define second cavity, wherein, in the direction from one end of the second plate section towards the other end of the second plate section, the second plate section extends obliquely away from the third bent section.

[0007] According to the side beam of the utility model, by being set as bent piece and including first bent section, second bent section and third bent section, the first plate of first bent section cooperates with second bent part to define the first cavity with rectangular cross section, third bent section cooperates with second plate and second bent section to define second cavity, simple structure, processing and manufacturing are convenient, so that the side beam has good structural strength, so that the running stability and safety performance of battery pack are better.

[0008] In some embodiments of the utility model, the second bending section includes: third plate section, the third plate section extends along the second direction and is perpendicular to the first plate section, one end of the third plate section is connected with the other end of the first plate section, first reinforcing plate section, the first reinforcing plate section extends along the second direction and is perpendicular to the first plate section, one end of the first reinforcing plate section is connected with one end of the first plate section, fourth plate section, the fourth plate section extends along the first direction and two ends are connected with the other end of the third plate section and the other end of the first reinforcing plate section respectively, the first plate section, the third plate section, the fourth plate section and the first reinforcing plate section cooperate to define the first cavity, the second direction is perpendicular to the first direction.

[0009] In an embodiment of the utility model, the third bending section includes: fifth plate section and sixth plate section, the fifth plate section extends along the second direction, two ends of the fifth plate section are connected with the other end of the second plate section and one end of the sixth plate section respectively, the sixth plate section extends along the first direction and the other end is connected with the first reinforcing plate section, the second plate section, the fifth plate section, the sixth plate section and the first reinforcing plate section cooperate to define the second cavity, in the second direction, the ratio of the length dimension of the fifth plate section and the length dimension of the third plate section is greater than or equal to 1.5.

[0010] In some examples of the utility model, the other end of the sixth plate section is formed with a first flange, the first flange extends along the second direction, the first flange is fixedly connected with the first reinforcing plate section, the length dimension of the first flange along the second direction is greater than or equal to 5mm, and one end of the first reinforcing plate section is formed with a second flange, the second flange extends along the first direction, the second flange is fixedly connected with the first plate section, the length dimension of the second flange along the first direction is greater than or equal to 5mm.

[0011] In some examples of the utility model, the other end of the sixth plate section is formed with a first connecting edge, the first connecting edge extends along the second direction and is fixedly connected with the first reinforcing plate section, the edge beam further includes second reinforcing plate section, the second reinforcing plate section extends along the first direction and two ends are connected with the first connecting edge and the fifth plate section respectively, the second reinforcing plate section is arranged in the second cavity, and the length dimension of the first connecting edge along the second direction is greater than or equal to 5mm.

[0012] In an example of the utility model, one end of the second reinforcing plate section away from the first reinforcing plate section is formed with a third flange, the third flange extends along the second direction, the third flange is fixedly connected with the fifth plate section, and the length dimension of the third flange along the second direction is greater than or equal to 5mm.

[0013] In one example of the present invention, the sixth plate segment includes: a first segment and a second segment, the first segment extends along the first direction and is connected to the fifth plate segment, the second segment is connected between the first connecting edge and the first segment, and the second segment extends obliquely away from the first segment in the second direction. In the first direction, the length dimension of the first segment is a first dimension, and the distance between the side surface of the fifth plate segment facing away from the second cavity and the side surface of the first reinforcing plate segment facing the second cavity is a second dimension, and the ratio of the first dimension to the second dimension is greater than or equal to 0.5.

[0014] In some examples of the present invention, in the first direction, the distance between the side surface of the fifth plate segment facing away from the second cavity and the side surface of the first reinforcing plate segment facing the second cavity is a second size, the distance between the side surface of the third plate segment facing away from the second cavity and the side surface of the first reinforcing plate segment facing the second cavity is a third size, and the ratio of the third size to the second size is greater than or equal to 1.2.

[0015] The lower box assembly according to the second aspect of the present invention includes a lower box, and the lower box is provided with the side beam according to the first aspect of the present invention.

[0016] According to the lower box assembly of the present invention, by setting the side beam of the first aspect mentioned above, the side beam is set as a bending part and includes a first bending section, a second bending section and a third bending section. The first plate portion of the first bending section cooperates with the second bending portion to define a first cavity with a rectangular cross-section, and the third bending section cooperates with the second plate portion and the second bending section to define a second cavity. The structure is simple and the processing and manufacturing are convenient, so that the side beam has good structural strength, thereby improving the operating stability and safety performance of the battery pack.

[0017] The battery pack according to the third aspect of the present invention includes the lower box assembly according to the second aspect of the present invention.

[0018] According to the battery pack of the present invention, by setting the lower box assembly of the second aspect mentioned above, the side beam is set as a bending part and includes a first bending section, a second bending section and a third bending section. The first plate portion of the first bending section cooperates with the second bending portion to define a first cavity with a rectangular cross-section, and the third bending section cooperates with the second plate portion and the second bending section to define a second cavity. The structure is simple and the processing and manufacturing are convenient, so that the side beam has good structural strength, thereby improving the operating stability and safety performance of the battery pack.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic view of a cross section of a side beam according to a first embodiment of the present application;

[0021] Figure 2 is a schematic view of a cross section of a side beam according to a second embodiment of the present application;

[0022] Figure 3 is a schematic view of a cross section of a side beam according to a third embodiment of the present application.

[0023] Reference signs:

[0024] 10, first bending section;

[0025] 11, first plate section; 12, second plate section;

[0026] 20, second bending section;

[0027] 21, third plate section; 22, fourth plate section; 23, first reinforcing plate section; 231, second flange;

[0028] 30, third bending section;

[0029] 31, fifth plate section; 32, sixth plate section; 321, first section; 322, second section; 3201, first flange;

[0030] 40, first connecting edge; 50, second reinforcing plate section; 51, third flange;

[0031] 100, side beam. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0033] Firstly, reference is made to Figures 1-3 The battery pack according to the third aspect of the present application is briefly described, the battery pack according to the embodiments of the present application comprises a lower box assembly, the lower box assembly comprises a lower box, the lower box is provided with a side beam 100, the side beam 100 is a component part of the lower box, for example, the side beam 100 can cooperate with the bottom plate structure of the lower box to form a containing cavity for containing a battery module or a plurality of battery monomers, and the side beam 100 can provide a fixing point with the whole vehicle for the installation of the battery pack.

[0034] Reference is made below to Figures 1-3The side beam 100 according to the first embodiment of the present invention is described.

[0035] like Figures 1-3 As shown, the side beam 100 according to the embodiment of the first aspect of the present invention is used for the lower box body of the battery pack. The side beam 100 is a bent part and includes: a first bending section 10, a second bending section 20 and a third bending section 30.

[0036] Specifically, the first bending section 10 is along the first direction (eg Figure 1 The left and right directions shown in the figure) extend and include a first plate segment 11 and a second plate segment 12, one end of the first plate segment 11 is connected to one end of the second plate segment 12; the two ends of the second bending segment 20 are respectively connected to the two ends of the first plate segment 11 along the first direction, and the second bending segment 20 cooperates with the first plate segment 11 to define a first cavity with a rectangular cross-section; the third bending segment 30 cooperates with the second bending segment 20 and the second plate segment 12 to define a second cavity, wherein, in the direction from one end of the second plate segment 12 toward the other end of the second plate segment 12, the second plate segment 12 extends obliquely away from the third bending segment 30.

[0037] In this embodiment, the side beam 100 is configured as a bending part and includes a first bending section 10, a second bending section 20 and a third bending section 30. The first bending section 10 is formed by bending to form a connected first plate section 11 and a second plate section 12. The two ends of the second bending section 20 are respectively connected to the two ends of the first plate section 11 and cooperate with the first plate section 11 to define a first cavity with a rectangular cross-section. For example, the second bending section 20 can be formed into a U-shaped structure with an opening toward the first plate section 11 by multiple bending, thereby cooperating with the first plate section 11 to form a first cavity with a rectangular cross-section.

[0038] In this embodiment, the third bending section 30 cooperates with the second bending section 20 and the second plate section 12 to define a second cavity. Since one end of the second plate section 12 is connected to one end of the first plate section 11 and both extend along the first direction, the third bending section 30 can be arranged on one side of the first cavity in the first direction, so that the third bending section 30 can cooperate well with the second bending section 20 and the second plate section 12 to form a second cavity.

[0039] When the side beam 100 is processed and manufactured, the first bending section 10, the second bending section 20 and the third bending section 30 of the side beam 100 are bent to form the overall structure of the side beam 100 and form the first cavity and the second cavity, which greatly reduces the difficulty of processing the side beam 100 and makes the side beam 100 more convenient and easy during the processing and manufacturing process.

[0040] The first plate segment 11 and the second bending segment 20 cooperate to form a first cavity with a rectangular cross section in the embodiment, the second plate segment 12 cooperates with the third bending segment 30 and the second bending segment 20 to form a second cavity, so that the first cavity and the second cavity can share part of the structure of the second bending segment 20, thereby making the overall structure of the edge beam 100 more compact, and the first bending segment 10, the second bending segment 20 and the third bending segment 30 have better integrity after bending processing, and the first cavity with a rectangular cross section cooperates with the second cavity to make the structure of the edge beam 100 have good structural stability, and since the edge beam 100 is arranged as a bending piece, the edge beam 100 can be bent by using a high-strength plate piece such as a steel plate, so that the edge beam 100 can have good structural strength.

[0041] In the embodiment, the second plate segment 12 extends obliquely away from the third bending segment 30, so that the first plate segment 11 and the second plate segment 12 form a bending angle, thereby making the edge beam 100 have better structural strength in the first bending segment 10. It can be understood that the edge beam 100 constitutes a side wall of a containing cavity of the lower box in the lower box, and the edge beam 100 is used to resist the lateral force of the external battery pack during operation of the battery pack. In the embodiment, the second plate segment 12 extends obliquely away from the third bending segment 30, so that the third bending segment 30 constitutes a side wall of the containing cavity on the side away from the first cavity in the first direction, the edge beam 100 can conveniently meet the needs of the depth of the containing cavity by adjusting the inclination angle or the extension length of the second plate segment 12, and the side surface of the edge beam 100 constituting the side wall of the containing cavity has a larger size in the second direction when the first direction is the lateral direction of the battery pack, thereby making the edge beam 100 have better structural strength, and the edge beam 100 can better resist the external force, so that the battery pack can be more stable during operation, and the safety performance is higher.

[0042] According to the edge beam 100 in the embodiment of the utility model, the edge beam 100 is arranged as a bending piece and includes the first bending segment 10, the second bending segment 20 and the third bending segment 30, the first plate part of the first bending segment 10 cooperates with the second bending part to define the first cavity with a rectangular cross section, and the third bending segment 30 cooperates with the second plate part and the second bending segment 20 to define the second cavity, so that the edge beam 100 has good structural strength, thereby making the battery pack have better operation stability and safety performance.

[0043] In some embodiments of the utility model, as shown in Figure 1 The second bending segment 20 can include a third plate segment 21, a first reinforcing plate segment 23 and a fourth plate segment 22, the third plate segment 21 extends along the second direction (for example, the Y direction) away from the first plate segment 11, the first reinforcing plate segment 23 is arranged on the third plate segment 21 and away from the first plate segment 11, and the fourth plate segment 22 is arranged on the third plate segment 21 and away from the first plate segment 11. Figure 1The third plate segment 21 extends in the second direction and is connected to the other end of the first plate segment 11, and the fourth plate segment 22 extends in the first direction and is connected to the other end of the third plate segment 21 and the other end of the first reinforcing plate segment 23, respectively. The first plate segment 11, the third plate segment 21, the fourth plate segment 22 and the first reinforcing plate segment 23 cooperatively define the first cavity, and the second direction is perpendicular to the first direction.

[0044] In the second bending segment 20, the third plate segment 21 and the first reinforcing plate segment 23 are connected and arranged perpendicularly to the first plate segment 11, and the fourth plate segment 22 is connected to the third plate segment 21 and the first reinforcing plate segment 23. The structure is simple, the first plate segment 11, the third plate segment 21, the fourth plate segment 22 and the first reinforcing plate segment 23 can be well enclosed to form the first cavity with a rectangular cross section, the processing is convenient, the first plate segment 11 is arranged perpendicularly to the third plate segment 21, and the first plate segment 11 is arranged perpendicularly to the first reinforcing plate segment 23, so that the first cavity structure of the edge beam 100 is more stable, thereby making the overall structure of the edge beam 100 more stable.

[0045] In an embodiment of the present application, the first bending segment 10 and the second bending segment 20 can be an integral piece, the first plate segment 11 and the third plate segment 21 are connected by a rounded corner, and the fourth plate segment 22 and the third plate segment 21 and the first reinforcing plate segment 23 can be connected by a rounded corner.

[0046] In the embodiment, the first bending segment 10 and the second bending segment 20 are provided as an integral piece, the structure is simple, the first bending segment 10 and the second bending segment 20 are bent and formed after the overall structure stability and integrity are better, thereby making the edge beam 100 have good structural strength and stability, so that the edge beam 100 can better resist external forces, and when the battery pack is assembled in the vehicle, the battery pack can be stably assembled and fixed to the vehicle through the edge beam 100. When the edge beam 100 is processed, the first bending segment 10 and the second bending segment 20 can be formed into the first reinforcing plate segment 23, the fourth plate segment 22, the third plate segment 21 and the first plate segment 11 by multiple bending of the same plate piece.

[0047] The first plate segment 11 and the third plate segment 21 are connected by a rounded corner in the embodiment, and the fourth plate segment 22 and the third plate segment 21 and the first reinforcing plate segment 23 can be connected by a rounded corner. The bending of the first plate segment 11 and the third plate segment 21 is relatively stable, the bending of the third plate segment 21 and the fourth plate segment 22 and the bending of the fourth plate segment 22 and the first reinforcing plate segment 23 are relatively stable, the corner structure formed by the first plate segment 11 and the third plate segment 21 has better strength, and the corner structure formed by the fourth plate segment 22 and the third plate segment 21 and the first reinforcing plate segment 23 has better strength, thereby reducing the risk of structural deformation failure at the corner, and the overall structural strength of the edge beam 100 is better and the structural stability is better.

[0048] In some examples of the utility model, the radius of the rounded corner can be greater than or equal to 3mm. In this way, the rounded corner at the position of the first bending segment 10 and the second bending segment 20 has a sufficient bending radius to reduce stress concentration at the rounded corner, and the first bending segment 10 and the second bending segment 20 are easier to bend. For example, the radius of the rounded corner can be 3mm, 3.5mm, 3.6mm, etc.

[0049] In one embodiment of the utility model, as shown in Figure 1 The third bending segment 30 can include a fifth plate segment 31 and a sixth plate segment 32. The fifth plate segment 31 extends in the second direction, and the two ends of the fifth plate segment 31 are connected to the other end of the second plate segment 12 and one end of the sixth plate segment 32, respectively. The sixth plate segment 32 extends in the first direction and the other end is connected to the first reinforcing plate segment 23. The second plate segment 12, the fifth plate segment 31, the sixth plate segment 32, and the first reinforcing plate segment 23 cooperate to define a second cavity. In the second direction, the ratio of the length dimension of the fifth plate segment 31 to the length dimension of the third plate segment 21 is greater than or equal to 1.5.

[0050] In the embodiment, the third bending segment 30 includes the fifth plate segment 31 and the sixth plate segment 32. The fifth plate segment 31 extends in the second direction and is connected to the other end of the second plate segment 12 and the sixth plate segment 32. The sixth plate segment 32 extends in the first direction and the other end is connected to the first reinforcing plate segment 23. The structure is simple and easy to process. The fifth plate segment 31, the sixth plate segment 32, the first reinforcing plate segment 23, and the second plate segment 12 cooperate to define a second cavity, so that the overall structural strength of the edge beam 100 is better, the structure is more stable, the first cavity and the second cavity share the first reinforcing plate segment 23, the overall structure of the edge beam 100 after bending is more compact, and the overall structural stability is better.

[0051] In the embodiment, the first reinforcing plate segment 23 is connected to one end of the first plate segment 11 and the second plate segment 12 in the first bending segment 10, and the first reinforcing plate segment 23 cooperates with the fourth plate segment 22 and the sixth plate segment 32, so that the first reinforcing plate segment 23 can play a good structural support and strengthening effect on the first bending segment 10 and the third bending segment 30, thereby making the overall structure of the side beam 100 more stable.

[0052] In the embodiment, the ratio of the length dimension of the fifth plate segment 31 to the length dimension of the third plate segment 21 is greater than or equal to 1.5, so that when the side beam 100 is arranged in the lower box body, the fifth plate segment 31 can have a larger dimension in the second direction when serving as a side wall structure of the accommodating cavity, the side beam 100 has a larger connection contact area when being welded with other structures such as the bottom plate of the lower box body, the stability of the lower box body structure is better, and the cross-sectional dimension of the side beam 100 gradually increases within the extension range of the second plate segment 12 in the first direction, so that the side beam 100 can more stably resist external forces, and the battery pack can have better safety performance.

[0053] For example Figure 1 As shown in FIG. 1, h1 represents the length dimension of the fifth plate segment 31, and h2 represents the length dimension of the third plate segment 21, and the ratio of h1 to h2 can be 1.5, 1.6, 1.64, 1.8, 1.9, etc.

[0054] In some embodiments of the utility model, the first bending segment 10 and the third bending segment 30 can be an integral piece, the second plate segment 12 and the fifth plate segment 31 are connected by a rounded corner, and the fifth plate segment 31 and the sixth plate segment 32 can be connected by a rounded corner.

[0055] In the embodiment, the first bending segment 10 and the third bending segment 30 are arranged as an integral piece, which is simple in structure, and the overall stability and integrity of the first bending segment 10 and the third bending segment 30 are better after being bent and formed, thereby making the side beam 100 have good structural strength and stability, and the side beam 100 can better resist external forces, so that the battery pack can be stably assembled and fixed to the vehicle through the side beam 100 when the battery pack is assembled in the whole vehicle. When the side beam 100 is processed, the first bending segment 10 and the third bending segment 30 can be formed into the sixth plate segment 32, the fifth plate segment 31, the second plate segment 12 and the first plate segment 11 by bending the same plate piece multiple times. Further, the first bending segment 10, the second bending segment 20 and the third bending segment 30 can be an integral piece, which can further simplify the processing difficulty of the side beam 100, reduce the connection fixing points when multiple components are spliced and connected, make the overall structure of the side beam 100 more stable and reliable, and have better integrity and structural strength.

[0056] In some examples of the utility model, as shown in FIG. 1, Figure 1As shown, the other end of the sixth plate segment 32 can be formed with a first flange 3201 extending along the second direction, the first flange 3201 is fixedly connected with the first reinforcing plate segment 23, and the length dimension of the first flange 3201 along the second direction is greater than or equal to 5 mm.

[0057] In the embodiment, the sixth plate segment 32 is provided with the first flange 3201 fixedly connected with the first reinforcing plate, the structure is simple, the fixing is convenient, the second cavity structure is more stable and reliable. Alternatively, the first flange 3201 can be welded with the first reinforcing plate segment 23.

[0058] In the embodiment, the length dimension of the first flange 3201 along the second direction is greater than or equal to 5 mm, so that the first flange 3201 has sufficient connection contact area with the first reinforcing plate segment 23, and the connection after the first flange 3201 is fixed with the first reinforcing plate segment 23 is more reliable and stable. For example, the length dimension of the first flange 3201 along the second direction can be 5 mm, 5.5 mm, 5.8 mm, 6 mm, 7 mm, etc. Alternatively, the first flange 3201 and the sixth plate segment 32 can be rounded, and the radius of the rounding can be greater than or equal to 3 mm.

[0059] In some examples of the utility model, as shown in Figure 1 As shown, one end of the first reinforcing plate segment 23 can be formed with a second flange 231 extending along the first direction, the second flange 231 is fixedly connected with the first plate segment 11, and the length dimension of the second flange 231 along the first direction is greater than or equal to 5 mm.

[0060] In the embodiment, the first reinforcing plate segment 23 is provided with the second flange 231 fixedly connected with the first plate segment 11, the structure is simple, the fixing is convenient, and the first cavity structure is more stable and reliable. Alternatively, the second flange 231 can be welded with the first plate segment 11.

[0061] In the embodiment, the length dimension of the second flange 231 along the first direction is greater than or equal to 5 mm, so that the second flange 231 can have sufficient connection contact area with the first plate segment 11, and the connection after the first reinforcing plate segment 23 is fixed with the first plate segment 11 through the second flange 231 is more reliable and stable. For example, the length dimension of the second flange 231 along the first direction can be 5 mm, 5.5 mm, 5.8 mm, 6 mm, 7 mm, etc. Alternatively, the second flange 231 and the first reinforcing plate segment 23 can be rounded, and the radius of the rounding can be greater than or equal to 3 mm.

[0062] In some examples of the utility model, as shown in Figure 1As shown, the second flange 231 can extend towards the fifth plate segment 31 along the first direction. In this way, the second cavity can be formed by the second flange 231, the first reinforcing plate segment 23, the second plate segment 12 and the third bending segment 30, and the second cavity can have a more stable structure state at the second plate segment 12 and the first reinforcing plate segment 23 through the connection of the second flange 231 and the first plate segment 11, the connection of the second flange 231 along the first direction and the first plate segment 11, and the connection of the first flange 3201 along the second direction and the first reinforcing plate segment 23, so that the overall structural stability of the edge beam 100 is better.

[0063] In some examples of the utility model, as shown in the drawings, Figure 2 As shown, the other end of the sixth plate segment 32 can be formed with a first connecting edge 40 extending along the second direction and fixedly connected with the first reinforcing plate segment 23, and the edge beam 100 further comprises a second reinforcing plate segment 50 extending along the first direction and connected with the first connecting edge 40 and the fifth plate segment 31 at both ends, and the second reinforcing plate segment 50 is arranged in the second cavity, and the length dimension of the first connecting edge 40 along the second direction is greater than or equal to 5 mm.

[0064] In the embodiment, the other end of the second plate segment 12 is formed with a first connecting plate edge fixedly connected with the first reinforcing plate segment 23, the second reinforcing plate segment 50 is arranged in the second cavity and extends along the first direction, the second reinforcing plate segment 50 is connected with the first connecting edge 40 and the fifth plate segment 31, and the structure is simple, so that the second cavity can be divided into two smaller cavities by the second reinforcing plate segment 50, thereby the second cavity can have better structural strength and structural stability, the second reinforcing plate segment 50 can well improve the structural strength and impact resistance of the edge beam 100 in the first direction, the overall structural strength of the edge beam 100 can be further improved, the overall structure of the edge beam 100 is more stable and reliable, and therefore the battery pack can have better safety performance and operation stability.

[0065] In the embodiment, the first connecting edge 40 extends along the second direction and is connected with the first reinforcing plate segment 23, so that the sixth plate segment 32 and the first reinforcing plate segment 23 are more convenient to connect and fix and are more stable and reliable in fixation.

[0066] In the embodiment, the length dimension of the first connecting edge 40 along the second direction is greater than or equal to 5 mm, so that the first connecting edge 40 and the first reinforcing plate segment 23 can have sufficient connection contact area, and the connection of the third bending segment 30 and the first reinforcing plate segment 23 through the first connecting edge 40 is more reliable and stable. For example, the length dimension of the first connecting edge 40 along the first direction can be 5 mm, 5.5 mm, 5.8 mm, 6 mm, 7 mm or the like. Alternatively, the first connecting edge 40 and the sixth plate segment 32 can be rounded, and the radius of the rounding can be greater than or equal to 3 mm.

[0067] In one example of the present application, as shown in Figure 2 The second reinforcing plate segment 50 can be formed with a third flange 51 at an end thereof away from the first reinforcing plate segment 23, the third flange 51 extending in the second direction, the third flange 51 being fixedly connected with the fifth plate segment 31, and the length dimension of the third flange 51 in the second direction being greater than or equal to 5 mm.

[0068] In the present embodiment, the second reinforcing plate segment 50 is provided with the third flange 51 fixedly connected with the fifth plate segment 31, which is simple in structure and convenient to fix, so that the second reinforcing plate segment 50 and the fifth plate segment 31 can be stably connected. The length dimension of the third flange 51 in the second direction is greater than or equal to 5 mm, so that the third flange 51 and the first reinforcing plate segment 23 can have sufficient connection contact area, and the connection of the second reinforcing plate segment 50 and the fifth plate segment 31 after being fixed by the third flange 51 is more reliable and stable. For example, the length dimension of the first connecting edge 40 in the first direction can be 5 mm, 5.5 mm, 5.8 mm, 6 mm, 7 mm, etc. Alternatively, the third flange 51 and the second reinforcing plate segment 50 can be rounded, and the radius of the rounding can be greater than or equal to 3 mm.

[0069] In some specific embodiments of the present application, as shown in Figure 2 The third flange 51 can extend in the second direction towards the second plate segment 12. In this way, the second reinforcing plate segment 50 and the fifth plate segment 31 can be more stably and reliably connected and fixed, and the second reinforcing plate segment 50 can more stably transmit the acting force in the first direction, so that the overall structural stability of the edge beam 100 is better.

[0070] In one example of the present application, as shown in Figure 3 The sixth plate segment 32 can include a first segment 321 extending in the first direction and connected with the fifth plate segment 31, and a second segment 322 connected between the first connecting edge 40 and the first segment 321, the second segment 322 extending in the second direction away from the first segment 321, the length dimension of the first segment 321 in the first direction being a first size, the distance between the side surface of the fifth plate segment 31 away from the second cavity and the side surface of the first reinforcing plate segment 23 towards the second cavity being a second size, and the ratio of the first size to the second size being greater than or equal to 0.5.

[0071] The sixth plate segment 32 in the embodiment includes a first segment 321 extending in the first direction and a second segment 322 connected with the first segment 321 and the first connecting edge 40 and extending obliquely away from the first segment 321, so that the first segment 321 and the second segment 322 form a bending angle, which can improve the structural strength of the sixth plate segment 32, make the first plate segment 11 better resist external forces, make the second cavity structure more stable, and make the connecting and fixing position of the first connecting edge 40 with the second reinforcing plate segment 50 in the second direction close to the first bending segment 10, so that the second reinforcing plate segment 50 can be more flexible in separating the second cavity as needed, and the second reinforcing plate segment 50 can play a better role in structural reinforcement.

[0072] For example, the third flange 51 is more suitable to be connected and fixed at the position of the fifth plate segment 31, and the first connecting edge 40 is more suitable to be connected and fixed at the position of the first reinforcing plate segment 23, so that the overall structural arrangement of the edge beam 100 is more uniform, the external forces can be more uniformly transmitted in the edge beam 100 when the edge beam 100 bears external forces, the risk of connection failure of the third flange 51 and the fifth plate segment 31 and the risk of connection failure of the first connecting edge 40 and the first reinforcing plate segment 23 are reduced, and the overall structure of the edge beam 100 is more stable and reliable.

[0073] In the embodiment, the length of the first segment 321 is the first size, the distance between the side surface of the fifth plate segment away from the second cavity and the side surface of the first reinforcing plate segment 23 facing the second cavity is the second size, and the ratio of the first size to the second size is greater than or equal to 0.5, so that the length of the first segment 321 is greater than or equal to the length of the second segment 322 in the first direction, which can make the first cavity and the second cavity maintain a relatively compact structure, make the edge beam 100 have better integrity to keep the overall structure of the edge beam 100 stable, and make the edge beam 100 have a larger outer surface at the sixth plate segment 32 for easy assembly and fixation. Figure 3 As shown in FIG. 1, L1 represents the first size and L2 represents the second size, and the ratio of L1 to L2 can be 0.5, 0.55, 0.6, 0.7, etc.

[0074] In some examples of the utility model, as shown in FIG. 1, Figure 3 As shown in FIG. 1, in the first direction, the distance between the side surface of the fifth plate segment 31 away from the second cavity and the side surface of the first reinforcing plate segment 23 facing the second cavity is the second size, the distance between the side surface of the third plate segment 21 away from the second cavity and the side surface of the first reinforcing plate segment 23 facing the second cavity is the third size, and the ratio of the third size to the second size can be greater than or equal to 1.2.

[0075] The distance between the side surface of the third plate section 21 away from the second cavity and the side surface of the first reinforcing plate section 23 facing the second cavity is a third size, and the ratio of the third size to the second size is greater than or equal to 1.2, so that the length of the first plate section 11 and the fourth plate section 22 in the first direction is greater than the length of the second plate section 12, the sixth plate section 32 and the second reinforcing plate section 50, that is, even if the size of the second cavity in the first direction is smaller than the size of the first cavity, the side beam 100 can form a larger assembly arrangement position in the first direction to facilitate the assembly of the vehicle, for example, fasteners can be arranged at the first plate section 11 and / or the fourth plate section 22 for assembly, so that the battery pack is more convenient for assembly of the vehicle.

[0076] The size of the second cavity in the first direction is set to be smaller, so that the side beam 100 can have better structural strength and stability at the second cavity, thereby making the side beam 100 better bear the internal pressure of the battery pack and play a good protection role, making the battery pack more stable and reliable as a whole, and having better safety performance. Figure 3 As shown in FIG. 3, L3 represents the third size, and the ratio of L3 to L2 can be 1.2, 1.3, 1.4, 1.5, etc.

[0077] Hereinafter, with reference to Figures 1-3 The lower box assembly according to the second aspect of the present application is described.

[0078] The lower box assembly according to the embodiment of the present application comprises a lower box, and the lower box is provided with the side beam 100 according to the first aspect of the present application.

[0079] Other configurations and operations of the lower box assembly according to the embodiment of the present application are known to those skilled in the art, and will not be described in detail here.

[0080] According to the lower box assembly according to the embodiment of the present application, the side beam 100 according to the above first aspect is provided, the side beam 100 is provided as a bending piece and comprises a first bending section 10, a second bending section 20 and a third bending section 30, the first plate part of the first bending section 10 cooperates with the second bending part to define a first cavity with a rectangular cross section, and the third bending section 30 cooperates with the second plate part and the second bending section 20 to define a second cavity, so that the structure is simple, the manufacturing is convenient, the side beam 100 has good structural strength, and the battery pack has better stability and safety performance.

[0081] Hereinafter, with reference to Figures 1-3 The battery pack according to the third aspect of the present application is described.

[0082] According to the battery pack according to the embodiment of the present application, the lower box assembly according to the second aspect of the present application is comprised.

[0083] Other structures and operations of the battery pack according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0084] According to the battery pack of the embodiment of the present invention, by setting the lower box assembly of the above-mentioned second aspect embodiment, the side beam 100 is set as a bending part and includes a first bending section 10, a second bending section 20 and a third bending section 30. The first plate portion of the first bending section 10 cooperates with the second bending portion to define a first cavity with a rectangular cross-section, and the third bending section 30 cooperates with the second plate portion and the second bending section 20 to define a second cavity. The structure is simple and the processing and manufacturing are convenient, so that the side beam 100 has good structural strength, thereby improving the operating stability and safety performance of the battery pack.

[0085] The following will refer to Figures 1-3 The battery pack according to three specific embodiments of the present invention is described.

[0086] Example 1:

[0087] like Figure 1 As shown, the battery pack includes a lower box body, which is provided with a side beam 100. The side beam 100 is a steel part and a bent part. Specifically, the side beam 100 can be made of high-strength steel by bending with a roller or the like.

[0088] The side beam 100 includes a first bending section 10, a second bending section 20, and a third bending section 30. The first bending section 10 includes a first plate section 11 and a second plate section 12. The first plate section 11 extends linearly along a first direction, and one end of the second plate section 12 is connected to one end of the first plate section 11. The second bending section 20 includes a third plate section 21, a fourth plate section 22, and a first reinforcing plate section 23. The third plate section 21 is connected to the fourth plate section 22 and the first reinforcing plate section 23 in sequence, and the third plate section 21 is connected to the other end of the first plate section 11. Specifically, the third plate section 21 extends linearly along the second direction, and the fourth plate section 22 extends linearly along the first direction. The fourth plate section 22 is arranged parallel to the first plate section 11. The first reinforcing plate section 23 is welded to one end of the first plate section 11 via a second flange 231.

[0089] The third bending section 30 comprises a fifth plate section 31 and a sixth plate section 32 connected in sequence, the fifth plate section 31 extends along the second direction and is connected to the other end of the second plate section 12, the sixth plate section 32 extends linearly along the first direction and is welded and fixed to the first reinforcing plate section 23 through the first flange 3201, and the sixth plate section 32 is arranged in line with the fourth plate section 22 in the first direction to form one side edge structure of the edge beam 100 in the second direction with the fourth plate section 22. Specifically, the first plate section 11 is connected to the third plate section 21, the third plate section 21 is connected to the fourth plate section 22, the fourth plate section 22 is connected to the first reinforcing plate section 23, the first reinforcing plate section 23 is connected to the second flange 231, the fifth plate section 31 is connected to the sixth plate section 32, the sixth plate section 32 is connected to the first flange 3201, and the bending angles of the above-mentioned connections are all 90 degrees, and the bending angle between the second plate section 12 and the fifth plate section 31 is 62 degrees.

[0090] In the manufacturing process of the edge beam 100, the steel plate can be bent multiple times to form the plate section structures and the flange structures of the edge beam 100, so that the edge beam 100 is easy to process and form, and in the actual production process, for battery packs with different structures, the edge beam 100 can be flexibly adjusted according to the needs of the bending parameters to produce edge beams 100 that meet different needs, so that the edge beam 100 can meet the production needs of various edge beams 100 in the production process, thereby making the edge beam 100 of the present embodiment can be widely used. The edge beam 100 of the present embodiment is a steel part and a bent part, which can effectively improve the structural strength of the edge beam 100. The processing and manufacturing of rolling, bending, welding and the like make the edge beam 100 more convenient and easy to process, so that the edge beam 100 can have a relatively thin thickness size while meeting the structural strength requirements, thereby improving the space utilization of the battery pack to a certain extent, leaving more design space for weight reduction and cost reduction, and making the battery pack more convenient and easy to assemble.

[0091] Embodiment two,

[0092] As Figure 2As shown, the structure of this embodiment is substantially the same as that of the first embodiment, wherein the same reference numerals are used for the same components, and the only difference is that the side beam 100 further includes a first connecting edge 40 and a second reinforcing plate segment 50, the first connecting edge 40 extending along the second direction and connected to the sixth plate segment 32, the second reinforcing plate segment 50 extending linearly along the first direction, one end of the second reinforcing plate segment 50 connected to the first connecting edge 40 and the other end welded to the fifth plate segment 31 via a third flange 51, the first connecting plate is welded to the first reinforcing plate segment 23, the second reinforcing plate segment 50, the first connecting edge 40 and the third bent segment 30 are integral, and the first connecting edge 40 and the second reinforcing plate segment 50, as well as the second reinforcing plate segment 50 and the third flange are connected at rounded corners, and the bending radius is 90 degrees. This can improve the structural strength of the side beam 100 and improve the overall structural stability of the side beam 100.

[0093] Example 3,

[0094] like Figure 3 As shown, the structure of this embodiment is roughly the same as that of the second embodiment, wherein the same parts are marked with the same figures, and the only difference is that: the sixth plate segment 32 includes a first segment 321 and a second segment 322, the first segment 321 extends straight along the first direction, one end of the first segment 321 is connected to the fifth plate segment 31 and the other end is connected to the second segment 322, the other end of the second segment 322 is connected to the first connecting edge 40 and extends obliquely in the second direction away from the first segment 321, so that the structural strength of the side beam 100 can be further improved, and the overall structure of the side beam 100 can be made more stable and reliable.

[0095] In the description of the present invention, 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 to 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 invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0096] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0097] In the utility model, unless another definite provision and limitation, the term " install " " link " " connect " " fixed " and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electric connection, also can be communication;Can be direct connection, also can pass through intermediate medium indirectly connect, can be two element internal communication or two element's mutual action relationship. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model according to specific circumstances.

[0098] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means 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 utility model. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.

[0099] Although the embodiments of the present utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A side beam, characterized in that: The lower box body of the battery pack is used, and the side beam is a bent part and includes: A first bending section (10), the first bending section (10) extending along a first direction and comprising a first plate section (11) and a second plate section (12), one end of the first plate section (11) being connected to one end of the second plate section (12); a second bending section (20), wherein two ends of the second bending section (20) are respectively connected to two ends of the first plate section (11) along the first direction, and the second bending section (20) cooperates with the first plate section (11) to define a first cavity with a rectangular cross-section; a third bending section (30), wherein the third bending section (30) cooperates with the second bending section (20) and the second plate section (12) to define a second cavity, wherein, in a direction from one end of the second plate section (12) toward the other end of the second plate section (12), the second plate section (12) extends obliquely away from the third bending section (30).

2. The side beam according to claim 1, characterized in that: The second bending section (20) comprises: a third plate segment (21), the third plate segment (21) extending along the second direction and arranged perpendicularly to the first plate segment (11), one end of the third plate segment (21) being connected to the other end of the first plate segment (11); a first reinforcing plate segment (23), the first reinforcing plate segment (23) extending along the second direction and arranged perpendicularly to the first plate segment (11), one end of the first reinforcing plate segment (23) being connected to one end of the first plate segment (11); a fourth plate segment (22), the fourth plate segment (22) extending along the first direction and having two ends connected to the other end of the third plate segment (21) and the other end of the first reinforcing plate segment (23), respectively; the first plate segment (11), the third plate segment (21), the fourth plate segment (22) and the first reinforcing plate segment (23) cooperate to define the first cavity; the second direction is perpendicular to the first direction.

3. The side beam according to claim 2, characterized in that: The third bending section (30) comprises: a fifth plate section (31) and a sixth plate section (32), the fifth plate section (31) extends along the second direction, the two ends of the fifth plate section (31) are respectively connected to the other end of the second plate section (12) and one end of the sixth plate section (32), the sixth plate section (32) extends along the first direction and the other end is connected to the first reinforcing plate section (23), the second plate section (12), the fifth plate section (31), the sixth plate section (32) and the first reinforcing plate section (23) cooperate to define the second cavity, and in the second direction, the ratio of the length dimension of the fifth plate section (31) to the length dimension of the third plate section (21) is greater than or equal to 1.

5.

4. The side beam according to claim 3, characterized in that: The other end of the sixth plate segment (32) is formed with a first flange (3201), the first flange (3201) extends along the second direction, the first flange (3201) is fixedly connected to the first reinforcing plate segment (23), and the length of the first flange (3201) along the second direction is greater than or equal to 5 mm, and a second flange (231) is formed at one end of the first reinforcing plate segment (23), the second flange (231) extends along the first direction, the second flange (231) is fixedly connected to the first plate segment (11), and the length of the second flange (231) along the first direction is greater than or equal to 5 mm.

5. The side beam according to claim 3, characterized in that: The other end of the sixth plate segment (32) is formed with a first connecting edge (40), the first connecting edge (40) extends along the second direction and is fixedly connected to the first reinforcing plate segment (23), the side beam also includes a second reinforcing plate segment (50), the second reinforcing plate segment (50) extends along the first direction and its two ends are respectively connected to the first connecting edge (40) and the fifth plate segment (31), the second reinforcing plate segment (50) is arranged in the second cavity, and the length dimension of the first connecting edge (40) along the second direction is greater than or equal to 5 mm.

6. The side beam according to claim 5, characterized in that: A third flange (51) is formed at one end of the second reinforcing plate segment (50) away from the first reinforcing plate segment (23), and the third flange (51) extends along the second direction. The third flange (51) is fixedly connected to the fifth plate segment (31), and the length of the third flange (51) along the second direction is greater than or equal to 5 mm.

7. The side beam according to claim 5, characterized in that: The sixth plate segment (32) comprises: a first segment (321) and a second segment (322), the first segment (321) extending along the first direction and connected to the fifth plate segment (31), the second segment (322) connected between the first connecting edge (40) and the first segment (321), the second segment (322) extending obliquely away from the first segment (321) in the second direction, the length dimension of the first segment (321) in the first direction is a first dimension, the spacing between a side surface of the fifth plate segment (31) facing away from the second cavity and a side surface of the first reinforcing plate segment (23) facing the second cavity is a second dimension, and the ratio of the first dimension to the second dimension is greater than or equal to 0.

5.

8. The side beam according to any one of claims 3 to 7, characterized in that: In the first direction, the distance between the side surface of the fifth plate segment (31) facing away from the second cavity and the side surface of the first reinforcing plate segment (23) facing the second cavity is a second size, the distance between the side surface of the third plate segment (21) facing away from the second cavity and the side surface of the first reinforcing plate segment (23) facing the second cavity is a third size, and the ratio of the third size to the second size is greater than or equal to 1.

2.

9. A lower box assembly, characterized in that: It comprises a lower box body, wherein the lower box body is provided with a side beam according to any one of claims 1-8.

10. A battery pack, characterized in that: Comprising the lower box assembly according to claim 9.

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