Front beam structure and battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a front beam structure and a battery pack, the front beam structure comprises a base beam, a first compression-resistant part and a second compression-resistant part, the base beam is provided with a first side edge and a second side edge which are oppositely arranged, the first side edge and the second side edge extend in the first direction, and the first direction is the length direction of the base beam; the first compression resisting part is connected with the first side edge and extends in the first direction; the second compression-resistant part is connected with the second side edge and extends along the first direction; the distance between the side, away from the base beam, of the first compression-resistant part and the base beam is a first width, the distance between the side, away from the base beam, of the second compression-resistant part and the base beam is a second width, and the second width is larger than the first width. The front beam structure has good transverse extrusion resistance and bottom extrusion resistance, and the stability and safety of mass production of the battery pack are effectively improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a front beam structure and a battery pack. Background Art

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

[0003] The design of the front beam needs to consider structural strength, weight and space, as follows: The front beam needs to have sufficient structural strength to withstand the impact that the battery pack may encounter during the vehicle's driving, which may cause the battery pack to be squeezed, and the bottom squeeze caused by the bottom colliding with stones. A front beam with insufficient strength may cause the battery pack structure to rupture, thereby affecting the safety of the battery pack; the front beam also needs to consider weight. An overweight front beam will increase the total weight of the battery pack, thereby affecting the vehicle's range and performance; the front beam also needs to make full use of space to ensure the rationality of the installation and layout of the battery module.

[0004] The interior of the front beam is usually used to place electrical components, such as copper plates, wiring harnesses, BDUs, etc. Due to the constraints of structural strength, weight and space, the current battery pack's front beam structure has low structural rigidity. The battery pack extrusion caused by impact and the bottom extrusion caused by collision with stones may cause internal electrical components to have internal short circuits, external short circuits, insulation failure or battery cell leakage, affecting the safety of the battery pack. Utility Model Content

[0005] The present application provides a front beam structure and a battery pack, which are used to solve the problem that the front beam structure of the battery pack in the prior art has low rigidity, and the battery pack is squeezed due to impact and the bottom is squeezed due to the bottom colliding with stones, which may cause internal short circuits, external short circuits, insulation failure or battery cell leakage in the internal electrical components.

[0006] On the one hand, the present application provides a front beam structure, comprising:

[0007] The base beam has a first side edge and a second side edge which are arranged opposite to each other, wherein the first side edge and the second side edge both extend along a first direction, and the first direction is a length direction of the base beam;

[0008] A first pressure-resistant portion, connected to the first side edge and extending along a first direction;

[0009] A second pressure-resistant portion, connected to the second side edge and extending along the first direction;

[0010] The distance between the side of the first anti-pressure portion away from the base beam and the base beam is a first width, the distance between the side of the second anti-pressure portion away from the base beam and the base beam is a second width, and the second width is greater than the first width.

[0011] In a possible design, the first width is less than or equal to 40 percent of the second width.

[0012] In a possible design, the thickness of the first anti-pressure portion is greater than the thickness of the second anti-pressure portion.

[0013] In a possible design, the base beam, the first pressure-resistant portion and the second pressure-resistant portion are an integrated structure.

[0014] In a possible design, the base beam, the first pressure-resistant portion and the second pressure-resistant portion are an integrated bent plate structure.

[0015] In a possible design, the first pressure-resistant part includes a first frame body and a second frame body, the first frame body and the second frame body are arranged along a second direction, and the second direction is a height direction of the base beam;

[0016] And / or, the second pressure-resistant part includes a third frame, a fourth frame, a fifth frame and a sixth frame, the third frame and the fourth frame are arranged along the second direction, the fifth frame and the sixth frame are arranged along the third direction, and the third direction is the width direction of the base beam.

[0017] In a possible design, the first frame, the second frame, the third frame, the fourth frame, the fifth frame, and the sixth frame are all rectangular frames, and the rectangular frames include:

[0018] Bending the transverse plate, wherein the bending the transverse plate is perpendicular to the second direction;

[0019] Bending the vertical plate, wherein the vertical plate is bent perpendicular to the third direction;

[0020] The bent horizontal plates and the bent vertical plates are alternately and vertically connected in sequence to form a rectangular frame.

[0021] In a possible design, an arc segment is formed between the bent horizontal plate and the bent vertical plate, and the diameter of the inner circle corresponding to the inner side wall of the arc segment is greater than or equal to 2 mm.

[0022] In a possible design, the rectangular frame further includes a tail plate, and the width of the tail plate is greater than or equal to one quarter of the width of the corresponding bent horizontal plate or bent vertical plate of the rectangular frame.

[0023] On the other hand, the present application also provides a battery pack, comprising the front beam structure as described above.

[0024] The beneficial effects of this application are as follows:

[0025] The front beam structure of the present application, by providing a base beam, a first anti-pressure part and a second anti-pressure part, the first anti-pressure part and the second anti-pressure part are respectively connected to the first side edge and the second side edge of the base beam, so as to improve the overall structural strength of the front beam, and at the same time reserve sufficient space for electrical components such as copper plates, wiring harnesses, BDUs, etc., so as to withstand larger impacts; the distance between the side of the first anti-pressure part away from the base beam and the base beam is the first width, and the distance between the side of the second anti-pressure part away from the base beam and the base beam is the second width. By making the second width greater than the first width, it is ensured that the second anti-pressure part extends to the bottom of the battery pack, thereby protecting the BDU (Battery disconnect unit) in the battery pack, and when the bottom collides with a stone and causes bottom extrusion, it can play a protective role and improve the safety of the battery pack.

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

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

[0028] Figure 1 A structural schematic diagram of a front beam structure provided for an embodiment of the present application;

[0029] Figure 2 Another structural schematic diagram of a front beam structure provided for an embodiment of the present application.

[0030] Reference numerals:

[0031] 100, base beam; 110, first side edge; 120, second side edge; 200, first pressure-resistant part; 210, first frame; 220, second frame; 300, second pressure-resistant part; 310, third frame; 320, fourth frame; 330, fifth frame; 340, sixth frame; 410, bent horizontal plate; 420, bent vertical plate; 510, first tail plate; 520, second tail plate. DETAILED DESCRIPTION

[0032] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0033] Combine the following Figure 1-Figure 2 , describing a front beam structure provided in an embodiment of the present application, including a base beam 100, a first anti-pressure part 200 and a second anti-pressure part 300, the base beam 100 having a first side edge 110 and a second side edge 120 arranged opposite to each other, the first side edge 110 and the second side edge 120 both extending along a first direction, the first direction being the length direction of the base beam 100; the first anti-pressure part 200 is connected to the first side edge 110 and extends along the first direction; the second anti-pressure part 300 is connected to the second side edge 120 and extends along the first direction; the distance between the side of the first anti-pressure part 200 away from the base beam 100 and the base beam 100 is a first width, the distance between the side of the second anti-pressure part 300 away from the base beam 100 and the base beam 100 is a second width, and the second width is greater than the first width. In some specific embodiments, the base beam 100 is plate-shaped, the first pressure-resistant part 200 and the second pressure-resistant part 300 are both perpendicular to the base beam 100, the first pressure-resistant part 200 is connected to the upper edge of the base beam 100, so that the first pressure-resistant part 200 is installed correspondingly at the top of the battery pack; the second pressure-resistant part 300 is connected to the lower edge of the base beam 100, so that the second pressure-resistant part 300 is installed correspondingly at the bottom of the battery pack; in some embodiments, the first pressure-resistant part 200 and the second pressure-resistant part 300 are both hollow structures to reduce the weight of the front beam.

[0034] It should be noted that the bottom of the BDU in the battery pack is currently only protected by a bottom guard plate, which has a weak structure. If the bottom of the BDU is squeezed, it will cause circuit safety problems.

[0035] By utilizing the technical solution of the above embodiment, a base beam 100, a first pressure-resistant part 200 and a second pressure-resistant part 300 are provided, and the first pressure-resistant part 200 and the second pressure-resistant part 300 are respectively connected to the first side edge 110 and the second side edge 120 of the base beam 100, so as to improve the overall structural strength of the front beam, and at the same time reserve sufficient space for electrical components such as copper plates, wiring harnesses, and BDUs, so as to withstand larger impacts; the second width (i.e., the width of the second pressure-resistant part 300) is made greater than the first width (i.e., the width of the first pressure-resistant part 200), so as to ensure that the second pressure-resistant part 300 can extend to the bottom of the battery pack, improve the strength of the bottom of the battery pack shell, thereby protecting the BDU in the battery pack, and playing a protective role when the bottom collides with a stone to cause bottom extrusion, thereby improving the safety of the battery pack.

[0036] Reference Figure 1 , Figure 2As shown, in some embodiments of the present application, the first width is less than or equal to 40 percent of the second width, that is, the width of the first anti-pressure part 200 is less than the width of the second anti-pressure part 300. In some specific embodiments, the width of the first anti-pressure part 200 is c, and the width of the second anti-pressure part 300, that is, the overall width of the front beam is W, wherein c = 0.3*W, or c = 0.35*W, or c = 0.4*W, etc. In this way, the width of the first anti-pressure part 200 can be smaller, and the width of the second anti-pressure part 300 extending out of the first anti-pressure part 200 can be larger, which is conducive to providing more space for the internal copper plate and line layout.

[0037] Reference Figure 2 As shown, in some embodiments of the present application, the thickness of the first anti-pressure part 200 is greater than the thickness of the second anti-pressure part 300. In some specific embodiments, the overall height of the front beam is H, W = (0.7 ~ 0.8) * H; the thickness of the first anti-pressure part 200 is 2h, h = 0.15 * H; the thickness of the second anti-pressure part 300 is e, e ≥ 0.2 * H. It should be noted that, since the width of the first anti-pressure part 200 is small and the length of the second anti-pressure part 300 is large, such a setting, by reducing the thickness of the second anti-pressure part 300, is conducive to providing more space for the internal copper plate and line layout; by increasing the thickness of the first anti-pressure part 200, it can be ensured that the first anti-pressure part 200 can ensure a high structural strength while having a small width.

[0038] Reference Figure 1 As shown, in some embodiments of the present application, the base beam 100, the first anti-pressure part 200 and the second anti-pressure part 300 are an integrated structure. For example, the base beam 100, the first anti-pressure part 200 and the second anti-pressure part 300 can be an integrated casting. By designing the base beam 100, the first anti-pressure part 200 and the second anti-pressure part 300 as an integrated structure, the structural strength of the front beam can be increased.

[0039] Reference Figure 1 , Figure 2 As shown, in some embodiments of the present application, the base beam 100, the first anti-pressure part 200 and the second anti-pressure part 300 are an integrated bent plate structure. In some specific embodiments, the base beam 100, the first anti-pressure part 200 and the second anti-pressure part 300 are formed by rolling a single sheet, wherein the sheet includes three major parts, the middle part is a flat plate, namely the base beam 100; the part near the head end is bent into a special shape, namely the second anti-pressure part 300; the part near the tail end is bent into a special shape, namely the first anti-pressure part 200. By rolling the base beam 100, the first anti-pressure part 200 and the second anti-pressure part 300 from a single sheet, the structural strength of the front beam can be effectively improved, with good advantages such as resistance to lateral and bottom extrusion, and the stability and safety of mass production of the battery pack can be improved. At the same time, the processing procedures of the front beam can be reduced and the processing cycle can be shortened.

[0040] Reference Figure 2 As shown, in some embodiments of the present application, the first pressure-resistant part 200 includes a first frame body 210 and a second frame body 220, and the first frame body 210 and the second frame body 220 are arranged along a second direction, and the second direction is the height direction of the base beam 100; the second pressure-resistant part 300 includes a third frame body 310, a fourth frame body 320, a fifth frame body 330 and a sixth frame body 340, and the third frame body 310 and the fourth frame body 320 are arranged along the second direction, and the fifth frame body 330 and the sixth frame body 340 are arranged along a third direction, and the third direction is the width direction of the base beam 100. In some specific embodiments, the heights of the first frame 210 and the second frame 220 are h, the heights of the third frame 310 and the fourth frame 320 are f, the thickness of the second pressure-resistant part 300 is e, f=0.5*e; the widths of the third frame 310 and the fourth frame 320 are a, the width of the second pressure-resistant part 300, that is, the overall width of the front beam is W, a=0.3*W; the width of the third frame 310 is b, b=1.2*a; by stacking the first frame 210 and the second frame 220 along the height direction of the base beam 100, the lateral compression strength of the front beam can be increased; by stacking the third frame 310 and the fourth frame 320 along the height direction of the base beam 100, and stacking the fifth frame 330 and the sixth frame 340 along the width direction of the base beam 100, the lateral compression strength of the front beam and the bottom compression strength of the front beam can be increased. In a specific embodiment, the first pressure-resistant part includes but is not limited to the above first frame 210 and second frame 220. The second pressure-resistant part includes but is not limited to the above third frame 310, fourth frame 320, fifth frame 330 and sixth frame 340.

[0041] Reference Figure 2As shown, in some embodiments of the present application, the first frame 210, the second frame 220, the third frame 310, the fourth frame 320, the fifth frame 330, and the sixth frame 340 are all rectangular frames. By designing the first frame 210, the second frame 220, the third frame 310, the fourth frame 320, the fifth frame 330, and the sixth frame 340 as rectangular frames, the horizontal and vertical structures of the rectangular frames themselves are utilized to enhance the structural stability and strength of the front beam. Specifically, the rectangular frame includes a bent horizontal plate 410 and a bent vertical plate 420, wherein the bent horizontal plate 410 is perpendicular to the second direction; the bent vertical plate 420 is perpendicular to the third direction; and the bent horizontal plate 410 and the bent vertical plate 420 are alternately and vertically connected in sequence to form a rectangular frame. In some specific embodiments, the number of the bent horizontal plates 410 and the bent vertical plates 420 is multiple (only one of the bent horizontal plates and one bent vertical plate is marked in the figure), each bent horizontal plate 410 is connected to its adjacent bent vertical plate 420, and each bent vertical plate 420 is connected to its adjacent bent horizontal plate 410. Specifically, all the bent horizontal plates 410, all the bent vertical plates 420 and the base beam 100 are formed by bending a plate multiple times. Generally, the bending angle is 90 degrees. Each rectangular frame is composed of a horizontal plate and a vertical plate after being bent at 90 degrees, and a rectangular through hole is formed inside the rectangular frame. With such an arrangement, there is no additional connection structure between all the bent horizontal plates 410, all the bent vertical plates 420 and the base beam 100, and the overall strength of the front beam is high and the weight is light.

[0042] Reference Figure 2 As shown, in some embodiments of the present application, an arc segment is formed between the bent horizontal plate 410 and the bent vertical plate 420, and the diameter of the inner circle corresponding to the inner side wall of the arc segment is greater than or equal to 2 mm. It should be noted that in some embodiments, since the bent horizontal plate 410 and the bent vertical plate 420 are a whole plate, the arc segment between the bent horizontal plate 410 and the bent vertical plate 420 is an arc segment formed by bending, wherein the diameter of the inner circle corresponding to the inner side wall of the arc segment is greater than or equal to 2 mm. Under this value range, the bend can play a role in transition and regulating the stress at the corner of the side beam, thereby reducing the risk of failure and rupture of the side beam at the corner.

[0043] Reference Figure 2As shown, in some embodiments of the present application, the rectangular frame further includes a tail plate, and the width of the tail plate is greater than or equal to one quarter of the width of the bent horizontal plate 410 or the bent vertical plate 420 of the corresponding rectangular frame. It should be noted that, in some embodiments, since the rectangular frame is composed of a bent horizontal plate 410 and a bent vertical plate 420 after a whole plate is bent multiple times, the two end edges of the whole plate need to be fixed to the adjacent bent horizontal plate 410 or bent vertical plate 420 or base beam 100 by welding, so as to shape the bent rectangular frame, and the tail plate is the part close to the two end edges of the whole plate fixed by welding. Therefore, there are two tail plates, namely a first tail plate 510 and a second tail plate 520, wherein the first tail plate 510 is located in the first pressure-resistant portion 200, the first tail plate 510 is horizontally arranged and welded to the adjacent bent horizontal plate 410, and the width of the first tail plate 510 is d, d=5mm, and the second tail plate 520 is located in the second pressure-resistant portion 300, the second tail plate 520 is vertically arranged and welded to the inner side of the base beam 100, and the width of the second tail plate 520 is g, 0.25*f≤g≤5mm. By making the width of the tail plate greater than or equal to one quarter of the width of the corresponding bent horizontal plate 410 or bent vertical plate 420 of the rectangular frame, the width of the first tail plate 510 and the second tail plate 520 are both greater than the welding width to ensure welding strength.

[0044] The same extrusion column was used to conduct an extrusion test on the front beam structure of the present application and the traditional front beam. Under the premise of the same extrusion displacement, the anti-extrusion capacity of the front beam structure of the present application and the traditional front beam was recorded respectively. The results are shown in the following table:

[0045] Extrusion column displacement 5mm 10mm 15mm 20mm 25mm 30mm 35mm 40mm Traditional front beam 7.4KN 14.0KN 20.1KN 26.6KN 33.7KN 43.7KN 54.9KN 66.0KN This patented front beam 46.5KN 59.5KN 70.3KN 80.9KN 93.0KN 107.2KN 125.5KN 144.8KN

[0046] From the test results in the above table, it can be seen that: compared with the traditional front beam, the anti-extrusion ability of the front beam structure of the present application is significantly improved, and the front beam structure of the present application has good application prospects.

[0047] The front beam structure provided by the embodiment of the present application has at least the following beneficial effects:

[0048] 1. The front beam structure of the present application is formed by rolling a single sheet of plate, which greatly improves the structural strength of the front beam structure, reduces the processing steps, shortens the processing cycle, and reduces the processing cost;

[0049] 2. It has good resistance to lateral extrusion. When the battery pack is squeezed by impact, it has stronger protection for internal electrical parts such as copper plates and wiring harnesses;

[0050] 3. It has good anti-bottom extrusion performance. When the bottom collides with stones and causes bottom extrusion, it has stronger protection capabilities for the BDU in the battery pack, which can improve the stability and safety of battery pack mass production.

[0051] A battery pack is also provided in an embodiment of the present application, including the front beam structure in the above embodiment.

[0052] It should be noted that the battery pack includes a front beam structure, which also includes all the advantages of the front beam structure mentioned above, which will not be repeated here.

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0055] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0056] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A front beam structure, characterized in that: include: A base beam having a first side edge and a second side edge arranged opposite to each other, wherein the first side edge and the second side edge both extend along a first direction, and the first direction is a length direction of the base beam; A first pressure-resistant portion, connected to the first side edge and extending along the first direction; A second pressure-resistant portion, connected to the second side edge and extending along the first direction; A distance between a side of the first anti-pressure portion away from the base beam and the base beam is a first width, a distance between a side of the second anti-pressure portion away from the base beam and the base beam is a second width, and the second width is greater than the first width.

2. The front beam structure according to claim 1, characterized in that: The first width is less than or equal to forty percent of the second width.

3. The front beam structure according to claim 1, characterized in that: The thickness of the first anti-pressure portion is greater than the thickness of the second anti-pressure portion.

4. The front beam structure according to claim 1, characterized in that: The base beam, the first anti-pressure portion and the second anti-pressure portion are an integrated structure.

5. The front beam structure according to claim 1, characterized in that: The base beam, the first anti-pressure portion and the second anti-pressure portion are an integrated bent plate structure.

6. The front beam structure according to any one of claims 1 to 5, characterized in that: The first pressure-resistant part includes a first frame body and a second frame body, the first frame body and the second frame body are arranged along a second direction, and the second direction is a height direction of the base beam; And / or, the second pressure-resistant part includes a third frame, a fourth frame, a fifth frame and a sixth frame, the third frame and the fourth frame are arranged along the second direction, the fifth frame and the sixth frame are arranged along the third direction, and the third direction is the width direction of the base beam.

7. The front beam structure according to claim 6, characterized in that: The first frame, the second frame, the third frame, the fourth frame, the fifth frame, and the sixth frame are all rectangular frames, and the rectangular frames include: A bent transverse plate, wherein the bent transverse plate is perpendicular to the second direction; A bent vertical plate, wherein the bent vertical plate is perpendicular to the third direction; The bent horizontal plates and the bent vertical plates are alternately and vertically connected in sequence to form the rectangular frame.

8. The front beam structure according to claim 7, characterized in that: An arc segment is formed between the bent horizontal plate and the bent vertical plate, and the diameter of the inner circle corresponding to the inner side wall of the arc segment is greater than or equal to 2 mm.

9. The front beam structure according to claim 7, characterized in that: The rectangular frame also includes a tail plate, the width of which is greater than or equal to one quarter of the width of the corresponding bent horizontal plate or bent vertical plate of the rectangular frame.

10. A battery pack, characterized in that: The invention comprises the front beam structure according to any one of claims 1 to 9.

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