Battery pack lower shell frame and battery pack lower shell with same

Abstract

The utility model discloses a battery pack lower shell frame and a battery pack lower shell with the battery pack lower shell frame, the battery pack lower shell frame comprises side edge beams, hanging beams and transverse and longitudinal beam assemblies, the side edge beams are beam bodies formed by rolling, and a plurality of side edge beams are connected end to end to form the battery frame; the mounting beam is a beam body formed by rolling, and the mounting beam is connected to the outer side of the battery frame; the transverse and longitudinal beam assembly comprises a transverse beam and a longitudinal beam which are fixedly connected, the transverse beam and the longitudinal beam are fixedly connected in the battery frame, and the transverse beam and the longitudinal beam are beam bodies formed by a cold drawing process. According to the lower shell frame of the battery pack disclosed by the utility model, the structural strength of the lower shell frame of the battery pack can be better improved through the side edge beams and the mounting beams which are formed by rolling and the cross beams and the longitudinal beams which are formed by a cold-drawing process, so that the lower shell frame of the battery pack is not easy to damage, and the installation of the lower shell frame of the battery pack can be better ensured; and the battery pack lower shell frame can well protect the battery cells or the battery modules in the battery pack lower shell frame from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic batteries, in particular to a battery pack lower shell frame and a battery pack lower shell having the same. Background Art

[0002] With the improvement of battery technology, the continuous improvement of the cruising range of new energy vehicles and the continuous breakthroughs in safety performance, the market share of new energy vehicles has increased year by year. However, in the post-subsidy era of new energy vehicles, reducing costs is an issue that every company has to consider. Therefore, under the premise of ensuring the cruising range and safety performance of new energy vehicles, reducing production costs and reducing carbon emissions are the future development trends. At present, high-pressure cast aluminum and aluminum profile welding are the mainstream solutions for the lower shell of the battery pack. This solution has the characteristics of lightweight. As far as the cruising range of new energy vehicles is concerned, the improvement of battery energy density contributes the most to it, and the weight of lightweighting is not large. However, the price of aluminum, the production process cost of aluminum profiles and the carbon emissions in the production process are relatively higher than those of steel, so it is necessary to explore a more economical, low-carbon and environmentally friendly lower shell solution.

[0003] The side beam of the lower shell is the key part for the battery pack to resist lateral extrusion, while the mounting beam is the load-bearing part during the transportation of the battery pack. It is also the bridge connecting the battery pack and the whole vehicle. These two key parts must have sufficient strength during the design process, otherwise the safety of the new energy vehicle will not be guaranteed. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery pack lower shell frame, the battery pack lower shell frame has good structural strength and is not easy to be damaged.

[0005] According to the embodiment of the utility model, the lower shell frame of the battery pack includes: side beams, which are roll-formed beam bodies, and there are multiple side beams, and the multiple side beams are connected end to end to construct a battery frame; a mounting beam, which is a roll-formed beam body, and the mounting beam is connected to the outside of the battery frame; a transverse and longitudinal beam assembly, which includes a fixedly connected transverse beam and a longitudinal beam, and the transverse beam and the longitudinal beam are fixedly connected in the battery frame, and the transverse beam and the longitudinal beam are beam bodies formed by a cold drawing process.

[0006] According to the battery pack lower shell frame of the embodiment of the utility model, the structural strength of the battery pack lower shell frame can be improved by roll-formed side beams, mounting beams and cold-drawn formed cross beams and longitudinal beams, so that the battery pack lower shell frame is not easily damaged, the installation of the battery pack lower shell frame can be better guaranteed, and the battery pack lower shell frame can better protect the internal battery cells or battery modules from damage.

[0007] In addition, the battery pack lower housing frame according to the utility model may also have the following additional technical features:

[0008] In some embodiments of the present invention, the side beam and the mounting beam are integrated beam bodies formed by roll forming of a metal plate.

[0009] In some embodiments of the utility model, the side beam has a first bent portion extending toward the side of the mounting beam, and / or the mounting beam has a second bent portion extending toward the side of the side beam, and the side beam and the mounting beam are welded at the first bent portion or the second bent portion.

[0010] In some embodiments of the utility model, the side beam constructed by the integrated beam body includes an upper side beam and a lower side beam, the upper side beam has a third bent portion extending toward the side of the lower side beam, and / or the lower side beam has a fourth bent portion extending toward the side of the upper side beam, and the upper side beam and the lower side beam are welded at the third bent portion or the fourth bent portion.

[0011] In some embodiments of the utility model, the cross-section of the mounting beam is rectangular, and the mounting beam has at least one cavity with a rectangular cross-section; and the cross-sectional shape of the upper side beam is a pentagon, and the cross-sectional shape of the lower side beam is a trapezoid, wherein the upper side and the lower side of the pentagon are parallel, and the upper side and the lower side of the trapezoid are parallel; or, the cross-sectional shape of the upper side beam and the cross-sectional shape of the lower side beam are both rectangular.

[0012] In some embodiments of the utility model, a plurality of reinforcing ribs are provided on the mounting beam, and the plurality of reinforcing ribs extend along the width direction of the mounting beam. A plurality of mounting holes are provided on the mounting beam, and the mounting holes are provided between two adjacent reinforcing ribs, wherein there are at least two reinforcing ribs between two adjacent mounting holes.

[0013] In some embodiments of the present invention, the battery pack lower shell frame further includes a lifting ear bushing, the lifting ear bushing is welded in the mounting hole, and the inner diameter of the lifting ear bushing is greater than the outer diameter of the bolt.

[0014] In some embodiments of the present invention, at least one cavity is provided in the cross beam and the longitudinal beam. When there are multiple cavities, the multiple cavities are arranged in the up-down direction.

[0015] In some embodiments of the present invention, a groove with an opening facing downward is provided on the bottom surface of the side beam, and the groove is arranged away from a side of the mounting beam.

[0016] The utility model also provides a battery pack lower shell having the battery pack lower shell frame of the above embodiment.

[0017] According to the embodiment of the utility model, the battery includes: a cold plate, a sealing structural adhesive, a plurality of blind rivets and a lower shell frame of the battery pack. The sealing structural adhesive is arranged between the side beams and the cold plate, and between the transverse and longitudinal beam assemblies and the cold plate. Some of the blind rivets are penetrated between the cold plate, the sealing structural adhesive and the side beams, and some of the blind rivets are penetrated between the cold plate, the sealing structural adhesive and the transverse and longitudinal beam assemblies to fix the cold plate to the lower side of the lower shell frame of the battery pack.

[0018] According to the battery pack lower shell of the embodiment of the utility model, by setting the battery pack lower shell frame of the above embodiment, the battery pack lower shell frame is not easy to be damaged, and can better ensure the installation of the battery pack lower shell, and the battery pack lower shell frame can better protect the internal battery cells or battery modules from damage.

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

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 It is a schematic structural diagram of the lower shell frame of the battery pack according to an embodiment of the utility model.

[0022] Figure 2 It is a schematic structural diagram of the lower shell frame of the battery pack according to an embodiment of the utility model.

[0023] Figure 3 It is a cross-sectional view of an example of a side beam of a lower shell frame of a battery pack according to an embodiment of the present utility model.

[0024] Figure 4 It is a cross-sectional view of an example of a side beam and a mounting beam of a lower shell frame of a battery pack according to an embodiment of the present utility model.

[0025] Figure 5 It is a cross-sectional view of an example of a side beam and a mounting beam of a lower shell frame of a battery pack according to an embodiment of the present utility model.

[0026] Figure 6 It is a cross-sectional view of an example of a side beam and a mounting beam of a lower shell frame of a battery pack according to an embodiment of the present utility model.

[0027] Figure 7It is a cross-sectional view of an example of a mounting beam of a lower shell frame of a battery pack according to an embodiment of the utility model.

[0028] Figure 8 It is a cross-sectional view of an example of a side beam, a mounting beam and a lifting ear bushing of a lower shell frame of a battery pack according to an embodiment of the utility model.

[0029] Fig. 9 It is an exploded view of the battery pack lower shell frame, cold plate and sealing structural adhesive of the battery according to an embodiment of the utility model.

[0030] Fig.10 It is a schematic structural diagram of the cooperation among the lower shell frame, cold plate and blind rivets of the battery pack according to an embodiment of the utility model.

[0031] Fig.11 yes Fig.10 Magnified view of area A.

[0032] Reference numerals:

[0033] Battery pack lower housing frame 100,

[0034] Side beam 1, first bending portion 11, upper side beam 12, third bending portion 121, lower side beam 13, fourth bending portion 131, groove 14,

[0035] Mounting beam 2, second bending portion 21, reinforcing rib 22, mounting hole 23,

[0036] Cross beam assembly 3, cross beam 31, longitudinal beam 32,

[0037] Lifting eye bushing 4,

[0038] Cold plate 200, sealing structural adhesive 300, blind rivet 5,

[0039] Battery pack lower shell 1000. DETAILED DESCRIPTION

[0040] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0042] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0043] Reference below Figure 1-Figure 11 A battery pack lower case frame 100 according to an embodiment of the present invention is described.

[0044] like Figure 1 and Figure 2 As shown, the battery pack lower shell frame 100 according to the embodiment of the utility model includes a side beam 1, a mounting beam 2 and a transverse and longitudinal beam assembly 3. The side beam 1 is a roll-formed beam body. Roll-forming is a metal sheet forming process. The metal sheet is continuously bent and plastically deformed by a series of continuously arranged rollers of different shapes to finally form a beam body with a desired cross-sectional shape. This process can ensure the high strength and rigidity of the material while reducing the weight of the components, which meets the requirements of lightweight design of modern automobiles. Therefore, the roll-formed side beam 1 has high strength and rigidity. Furthermore, the side beam 1 has multiple side beams 1, and multiple side beams 1 are connected end to end to construct a battery frame. Therefore, the battery frame can have high strength and rigidity, and can better avoid deformation of the battery pack lower shell frame 100, thereby better protecting the battery cells or battery modules in the battery pack lower shell frame 100 from damage.

[0045] Furthermore, the mounting beam 2 is a roll-formed beam body, and the mounting beam 2 is connected to the outside of the battery frame, that is, the battery pack lower shell frame 100 can be installed on the external structure through the mounting beam 2. For example, the battery pack lower shell frame 100 can be installed on the lower side of the vehicle body through the mounting beam 2, that is, it is mounted on the lower side of the vehicle body in a suspended form. It can be understood that stress concentration is prone to occur at the mounting beam 2. By making the mounting beam 2 a roll-formed beam body, the structural strength of the mounting beam 2 can be improved, and deformation of the mounting beam 2 can be avoided, thereby affecting the assembly of the battery pack lower shell frame 100.

[0046] Furthermore, the cross beam assembly 3 includes a cross beam 31 and a longitudinal beam 32 which are fixedly connected. The cross beam 31 and the longitudinal beam 32 are fixedly connected in the battery frame. Both the cross beam 31 and the longitudinal beam 32 are formed by a cold drawing process. Figure 1 and Figure 2 As shown, the cross beam 31 extends along a first direction, and the longitudinal beam 32 extends along a second direction. The first direction and the second direction are perpendicular to each other. The first direction can refer to the left-right direction, and the second direction can refer to the front-back direction. By fixing the cross beam 31 and the longitudinal beam 32 to the battery frame, the structural strength of the battery frame can be further improved, and the force borne by the mounting beam 2 can be better transmitted to the cross beam 31 or the longitudinal beam 32 through the side beam 1, and transmitted and decomposed along the cross beam 31 or the longitudinal beam 32. Therefore, the mounting beam 2 and the side beam 1 can be further prevented from being easily deformed.

[0047] The rolling process can obtain a closed cross-section and higher strength, which is used in the design of the lower shell frame 100 of the battery pack and has good economic applicability. Optionally, the side beams 1, mounting beams 2, cross beams 31 and longitudinal beams 32 of the utility model can all be made of steel. Steel has low carbon emissions during the production process and is very environmentally friendly. The side beam 1 is the key part of the battery to resist lateral extrusion, and the mounting beam 2 is the load-bearing part during battery transportation, and it is also the bridge connecting the battery and the whole vehicle. These two key parts must have sufficient strength during the design process, otherwise the safety of the new energy vehicle will not be guaranteed. There are many cross beams 31 and longitudinal beams 32 inside the lower shell frame 100 of the battery pack. These cross beams 31 and longitudinal beams 32 are rectangular beams formed by cold drawing process, which can better improve the structural strength of the lower shell frame 100 of the battery pack.

[0048] Therefore, according to the battery pack lower shell frame 100 of the embodiment of the utility model, the structural strength of the battery pack lower shell frame 100 can be improved through the roll-formed side beams 1 and mounting beams 2 and the cold-drawn cross beams 31 and longitudinal beams 32, so that the battery pack lower shell frame 100 is not easily damaged, the installation of the battery pack lower shell frame 100 can be better guaranteed, and the battery pack lower shell frame 100 can better protect the internal battery cells or battery modules from damage.

[0049] Alternatively, if Figure 4-Figure 6 As shown, the side beam 1 and the mounting beam 2 are integrated beam bodies roll-formed from a piece of metal plate, that is, the side beam 1 and the mounting beam 2 are designed as an integral structure and completed through a one-time forming process, which can reduce the number of parts, simplify the assembly process, reduce production costs, and improve the stability and connection strength of the overall structure; it can make the metal material give full play to its mechanical properties, ensure that the beam body has sufficient strength and rigidity to support and protect the battery module inside the battery pack lower shell frame 100, and withstand various external loads and impacts; because the same piece of metal plate is used for one-time forming, the waste of raw materials is reduced, which is conducive to the realization of green and sustainable manufacturing concepts; the integrated beam body design helps to improve the overall safety of the battery pack lower shell frame 100, enhance the battery's protection capabilities under extreme conditions such as collisions, and ensure the safe operation of electric vehicles.

[0050] In some embodiments of the utility model, the side beam 1 has a first bent portion 11 extending and bent on the side facing the mounting beam 2, and / or the mounting beam 2 has a second bent portion 21 extending and bent on the side facing the side beam 1, and the side beam 1 and the mounting beam 2 are welded at the first bent portion 11 or the second bent portion 21.

[0051] Reference Figure 4 and Figure 5 In the first example shown, the side beam 1 has two first bent portions 11 extending and bent on one side toward the mounting beam 2, and the two first bent portions 11 are respectively located on the upper and lower sides of the mounting beam 2. Specifically, the first bent portion 11 located on the upper side is adhered to and welded to the upper side surface of the upper plate body of the mounting beam 2, and the first bent portion 11 located on the lower side is adhered to and welded to the upper side surface of the lower plate body of the mounting beam 2. Therefore, by welding the mounting beam 2 at the two first bent positions, the connection strength between the mounting beam 2 and the side beam 1 can be improved.

[0052] Reference Figure 6In the second example shown, in the up-down direction, the side beam 1 has a first bent portion 11 extending and bent on the side facing the mounting beam 2, and the mounting beam 2 has a second bent portion 21 extending and bent on the side facing the side beam 1, the second bent portion 21 is spaced apart from the first bent portion 11 along the up-down direction, the first bent portion 11 is adhered and welded to the upper side surface of the lower plate body of the mounting beam 2, and the second bent portion 21 is adhered and welded to the outer side surface of the side beam 1, thereby improving the connection strength between the mounting beam 2 and the side beam 1.

[0053] In some embodiments of the utility model, the side beam 1 constructed by the integrated beam body includes an upper side beam 12 and a lower side beam 13, the upper side beam 12 has a third bent portion 121 bent and extended on the side facing the lower side beam 13, and / or the lower side beam 13 has a fourth bent portion 131 bent and extended on the side facing the upper side beam 12, and the upper side beam 12 and the lower side beam 13 are welded at the third bent portion 121 or the fourth bent portion 131.

[0054] Reference Figure 4 and Figure 5 In an example shown, the side surface of the upper side beam 12 has a third bending portion 121 , which is welded to the lower side beam 13 , and a fourth bending portion 131 is provided between the lower side beam 13 and the mounting beam 2 , which is welded to the lower side surface of the upper side beam 12 .

[0055] Reference Figure 6 In an example shown, the side surface of the upper side beam 12 has a third bending portion 121 , which is welded to the lower side beam 13 , and a fourth bending portion 131 is provided between the lower side beam 13 and the mounting beam 2 , which is welded to the lower side surface of the upper side beam 12 .

[0056] The first to fourth bending portions 11 to 131 in the above examples are merely illustrative examples rather than limitations on the present invention. It is understandable that the side beam 1 and the mounting beam 2 may also have other bending forms and may be welded at the bending positions to increase the connection strength between the side beam 1 and the mounting beam 2. The present invention does not impose any limitation on this.

[0057] In some embodiments of the utility model, the cross-section of the mounting beam 2 is rectangular, and the mounting beam 2 has at least one cavity with a rectangular cross-section; in one example, the mounting beam 2 has a cavity with a rectangular cross-section; in one example, the mounting beam 2 has two cavities, which are arranged up and down and have rectangular cross-sections; in one example, the mounting beam 2 has a cavity with a trapezoidal cross-section.

[0058] Alternatively, if Figure 5As shown, the cross-sectional shape of the upper side beam 12 is a pentagon, and the cross-sectional shape of the lower side beam 13 is a trapezoid, wherein the upper side and the lower side of the pentagon are parallel, and the upper side and the lower side of the trapezoid are parallel.

[0059] Alternatively, if Figure 6 As shown, the cross-sectional shape of the upper side beam 12 and the cross-sectional shape of the lower side beam 13 are both rectangular.

[0060] The cross-sectional shapes of the upper side beam 12, the lower side beam 13 and the mounting beam 2 in the above example can provide a high bending moment resistance and a large moment of inertia, and are suitable for bearing large horizontal (such as lateral extrusion) and vertical (such as bending stress) loads. In the application of the battery pack lower shell frame 100, such a beam design can effectively resist external impact forces and the stress caused by the weight of the battery itself.

[0061] In some embodiments of the present invention, Figure 7 As shown, the mounting beam 2 is provided with a plurality of reinforcing ribs 22, and the plurality of reinforcing ribs 22 extend along the width direction of the mounting beam 2. The mounting beam 2 is provided with a plurality of mounting holes 23, and the mounting holes 23 are provided between two adjacent reinforcing ribs 22, wherein there are at least two reinforcing ribs 22 between two adjacent mounting holes 23. Thus, the structural strength of the mounting beam 2 can be further improved by providing the reinforcing ribs 22, and the mounting holes 23 are provided between two adjacent reinforcing ribs 22, which can better ensure that the mounting holes 23 are not easily deformed.

[0062] Alternatively, if Figure 7 and Figure 8 As shown, the battery pack lower shell frame 100 also includes a lifting ear bushing 4, which is welded in the mounting hole 23, thereby improving the connection strength between the lifting ear bushing 4 and the mounting beam 2. Furthermore, the inner diameter of the lifting ear bushing 4 is larger than the outer diameter of the bolt, so that the mounting beam 2 can be better fixed to the vehicle by the bolt, and since the bolt and the lifting ear bushing 4 can move relatively, the position of the battery relative to the vehicle in the up and down directions can be better adjusted.

[0063] In some embodiments of the utility model, at least one cavity is provided in the cross beam 31 and the longitudinal beam 32. When there are multiple cavities, the multiple cavities are arranged in the up-down direction. By providing hollow cavities in the cross beam 31 and the longitudinal beam 32, the amount of material used in the beam body can be reduced, thereby achieving the purpose of lightweight design, and the torsional rigidity and bending rigidity of the beam can also be improved. The closed cavity can play a role similar to the reinforcing rib 22, enhancing the bending resistance of the beam in a specific direction.

[0064] In some embodiments of the present invention, Fig.10 and Fig.11As shown, a groove 14 with an opening facing downward is provided on the bottom surface of the side beam 1, and the groove 14 is provided on a side away from the mounting beam 2. By providing the groove 14, when the side beam 1 and the cold plate 200 are sealed by the sealing structural adhesive 300, the sealing structural adhesive 300 can overflow into the groove 14, which can better improve the sealing effect between the side beam 1 and the cold plate 200, and can also increase the contact area between the sealing structural adhesive 300 and the side beam 1 to a certain extent, thereby improving the connection strength between the side beam 1 and the cold plate 200.

[0065] Optionally, the groove 14 may also be located between the bottom surface and the side surface of the side beam 1 , and the present invention does not impose any limitation thereto.

[0066] The present invention further provides a battery pack lower housing 1000 having the battery pack lower housing frame 100 of the above embodiment.

[0067] like Fig. 9 As shown, the battery pack lower shell 1000 according to an embodiment of the utility model includes: a cold plate 200, a sealing structural adhesive 300, a plurality of blind rivets 5 and a battery pack lower shell frame 100, the sealing structural adhesive 300 is arranged between the side beam 1 and the cold plate 200, and between the transverse and longitudinal beam assembly 3 and the cold plate 200, part of the blind rivets 5 are penetrated between the cold plate 200, the sealing structural adhesive 300 and the side beam 1, and part of the blind rivets 5 are penetrated between the cold plate 200, the sealing structural adhesive 300 and the transverse and longitudinal beam assembly 3, so as to fix the cold plate 200 to the lower side of the battery pack lower shell frame 100.

[0068] Reference Figure 1 and Fig. 9 In the example shown, multiple cross beams 31 and longitudinal beams 32 are provided, so that the cross beams 31 and longitudinal beams 32 are arranged in a grid shape, and the cold plate 200 is not only fixedly connected to the side beams 1 by the blind rivets 5, but also fixedly connected to the cross beams 31 and longitudinal beams 32 arranged in a grid shape, which can better improve the installation reliability of the cold plate 200 and make the cold plate 200 not easily deformed.

[0069] In addition, the cold plate 200 can be better fastened to the lower side of the lower shell frame 100 of the battery pack in the up and down directions through the blind rivets 5, and the structural sealant can be better squeezed, so that the structural sealant can be better sealed. In addition, the groove 14 of the side beam 1 can also overflow into the groove 14 when the sealing structural glue 300 is used to seal between the side beam 1 and the cold plate 200, which can better improve the sealing effect between the side beam 1 and the cold plate 200, and can also increase the contact area between the sealing structural glue 300 and the side beam 1 to a certain extent, thereby improving the connection strength between the side beam 1 and the cold plate 200.

[0070] Other structures and operations of the battery pack lower housing frame 100 and the battery pack lower housing 1000 according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0071] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. 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 utility model. In this specification, the schematic representation 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.

[0072] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack lower shell frame, characterized in that: include: Side beams, the side beams are roll-formed beam bodies, there are multiple side beams, and multiple side beams are connected end to end to construct a battery frame; A mounting beam, wherein the mounting beam is a roll-formed beam body, and the mounting beam is connected to the outside of the battery frame; A transverse and longitudinal beam assembly, wherein the transverse and longitudinal beam assembly comprises a transverse beam and a longitudinal beam that are fixedly connected, wherein the transverse beam and the longitudinal beam are fixedly connected in a battery frame, and both the transverse beam and the longitudinal beam are beam bodies formed by a cold drawing process.

2. The battery pack lower housing frame according to claim 1, characterized in that: The side beam and the mounting beam are integrated beam bodies formed by roll forming of a metal plate.

3. The battery pack lower housing frame according to claim 2, characterized in that: The side beam has a first bent portion extending toward the mounting beam, and / or the mounting beam has a second bent portion extending toward the side beam, and the side beam and the mounting beam are connected by welding at the first bent portion or the second bent portion.

4. The battery pack lower housing frame according to claim 2, characterized in that: The side beam constructed by the integrated beam body includes an upper side beam and a lower side beam, the upper side beam has a third bending portion extending toward the side of the lower side beam, and / or the lower side beam has a fourth bending portion extending toward the side of the upper side beam, and the upper side beam and the lower side beam are connected by welding at the position of the third bending portion or the fourth bending portion.

5. The battery pack lower housing frame according to claim 4, characterized in that: The mounting beam has a rectangular cross section, and has at least one cavity with a rectangular cross section; and, The cross-sectional shape of the upper side beam is a pentagon, and the cross-sectional shape of the lower side beam is a trapezoid, wherein the upper side and the lower side of the pentagon are parallel, and the upper side and the lower side of the trapezoid are parallel; or, the cross-sectional shape of the upper side beam and the cross-sectional shape of the lower side beam are both rectangular.

6. The battery pack lower housing frame according to claim 1, characterized in that: The mounting beam is provided with a plurality of reinforcing ribs extending along the width direction of the mounting beam. The mounting beam is provided with a plurality of mounting holes, the mounting holes being arranged between two adjacent reinforcing ribs, wherein there are at least two reinforcing ribs between two adjacent mounting holes.

7. The battery pack lower housing frame according to claim 6, characterized in that: It also includes a lifting ear bushing, which is welded in the mounting hole, and the inner diameter of the lifting ear bushing is greater than the outer diameter of the bolt.

8. The battery pack lower housing frame according to claim 1, characterized in that: The cross beam and the longitudinal beam have at least one cavity therein. When there are multiple cavities, the multiple cavities are arranged in the up-down direction.

9. The battery pack lower housing frame according to claim 1, characterized in that: The bottom surface of the side beam is provided with a groove opening downwards, and the groove is arranged away from a side of the mounting beam.

10. A battery pack lower shell, characterized in that: include: A cold plate, a sealing structural adhesive, a plurality of blind rivets and a battery pack lower shell frame as described in any one of claims 1 to 9, wherein the sealing structural adhesive is arranged between the side beam and the cold plate, and between the transverse and longitudinal beam assembly and the cold plate, and part of the blind rivets are passed through the cold plate, the sealing structural adhesive and the side beam, and part of the blind rivets are passed through the cold plate, the sealing structural adhesive and the transverse and longitudinal beam assembly to fix the cold plate to the lower side of the battery pack lower shell frame.

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