Lower box body of battery pack

Abstract

The utility model discloses a lower box body of a battery pack, the lower box body comprises a water cooling plate, an edge beam and a front panel, the edge beam is located at the edge of the water cooling plate, the edge beam and the water cooling plate are integrally formed parts manufactured through an extrusion process, the edge beam is provided with an upper fixing part and a lower fixing part, and the upper fixing part and the lower fixing part are integrally formed. The upper fixing part is used for being fixedly connected with an upper box body of the battery pack, the lower fixing part is used for being fixed with a support, the front panel is arranged on the edge of the water cooling plate, and the front panel is fixedly connected with the water cooling plate and an edge beam. The edge beam of the lower box body of the battery pack does not adopt a welding process, and the edge beam and the water cooling plate are manufactured into the integrated piece through an integral extrusion process, so that the overall structural strength can be kept, and the cost increased by the welding process can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially relates to a lower box of battery pack. BACKGROUND

[0002] In the lower box design of conventional battery pack, the edge beam fixed structure adopts the welding form, for the aluminum alloy material, the welding strength is only 50% relative to the body, and the welding area will become the heat affected zone, causes the bad influence to the toughness of aluminum alloy, easily becomes the crack propagation's germination area, causes the fatigue failure. SUMMARY

[0003] The utility model provides a lower box of battery pack.

[0004] The utility model adopts the following technical scheme:

[0005] A lower box of battery pack, comprising:

[0006] Water cooling plate;

[0007] Edge beam, the edge beam is located at the edge of water cooling plate, and the edge beam and water cooling plate are integrally formed by extrusion process, the edge beam has upper fixed part and lower fixed part, the upper fixed part is used for and the upper box of battery pack is connected fixed, and the lower fixed part is used for and support fixed;

[0008] Front panel, the front panel is arranged at the edge of water cooling plate, and the front panel is connected and fixed with water cooling plate and edge beam.

[0009] Optionally, the edge beam includes main beam and cover shell, the main beam is connected to the water cooling plate, and the main beam and the water cooling plate are located in the same plane;

[0010] The cover shell is connected to one side of the main beam along the thickness direction;

[0011] The upper fixed part is arranged on the cover shell, and the lower fixed part is arranged on the main beam.

[0012] Optionally, a notch part is arranged on the cover shell, and the lower fixed part is exposed to the notch part.

[0013] Optionally, a recess is formed between the lower surface of the main beam and the lower surface of the water cooling plate.

[0014] Optionally, the height difference between the lower surface of the main beam and the lower surface of the water cooling plate is 1mm to 3mm.

[0015] Optionally, a through groove is arranged on the side of the main beam close to the water cooling plate.

[0016] Optionally, the lower fixing part comprises a threaded hole and a connecting hole penetrating the main beam, and an inner wall of the connecting hole is a smooth wall surface.

[0017] Optionally, the connecting hole extends along a length direction of the main beam.

[0018] Optionally, the cover shell comprises a top wall, a side wall and an inclined wall, the top wall is arranged in a spaced manner with the main beam, the side wall and the inclined wall are arranged on two sides of the top wall, and the side wall and the inclined wall are connected with the main beam.

[0019] The upper connecting part comprises a through hole arranged on the top wall.

[0020] Optionally, the main beam of the side edge of the water-cooling plate comprises a plurality of beam segments, each beam segment is connected with the water-cooling plate, and each beam segment is arranged in a spaced manner along the edge of the water-cooling plate.

[0021] The specific embodiments of the utility model will be described in further detail below with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are part of the present application, serve to provide a further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof serve to explain the utility model, but do not constitute an improper limitation on the utility model. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings. In the drawings:

[0023] Figure 1 Fig. 1 is a structural schematic view of a lower box body of a battery pack provided by an embodiment of the present application;

[0024] Figure 2 Fig. 2 is a structural schematic view of a first side beam of the lower box body of the battery pack provided by the embodiment of the present application;

[0025] Figure 3 Fig. 3 is a partial structural schematic view of the lower box body of the battery pack provided by the embodiment of the present application;

[0026] Figure 4 Fig. 4 is a structural schematic view of a second side beam of the lower box body of the battery pack provided by the embodiment of the present application.

[0027] In the drawings: 1, water-cooling plate; 2, side beam; 21, main beam; 22, cover shell; 221, top wall; 2211, through hole; 222, side wall; 223, inclined wall; 224, notch part; 23, recess part; 24, through slot; 25, threaded hole; 26, connecting hole; 3, front panel.

[0028] It should be noted that the drawings and the written description are not intended to limit the scope of the present application in any way, but are merely to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] Referring to Figures 1 to 4 As shown in the drawings, the present application provides a lower box body of a battery pack, comprising: a water cooling plate 1, a side beam 2 and a front panel 3. The side beam 2 is located at the edge of the water cooling plate 1, and the side beam 2 and the water cooling plate 1 are integrally formed by an extrusion process, the side beam 2 has an upper fixing part and a lower fixing part, the upper fixing part is used for connecting and fixing with the upper box body of the battery pack, and the lower fixing part is used for fixing with a support, the front panel 3 is arranged at the edge of the water cooling plate 1, and the front panel 3 is connected and fixed with the water cooling plate 1 and the side beam 2.

[0033] The side beam 2 of the lower box body of the battery pack of the present application is not made by a welding process, but is made into an integral piece by an integral extrusion process with the water cooling plate 1, which can not only maintain the overall structural strength, but also reduce the cost increased by the welding process.

[0034] In the embodiments of the present application, the thickness of the bottom and the side edge of the side beam 2 is increased, which can increase the strength and rigidity of the lower box body, and shorten the overall width of the lower box body.

[0035] In some possible embodiments, the edge beam 2 comprises a main beam 21 connected to the water-cooling plate 1 and a cover 22 connected to one side of the main beam 21 in the thickness direction, the main beam 21 and the water-cooling plate 1 are in the same plane, the cover 22 is provided with the upper fixing part, and the main beam 21 is provided with the lower fixing part. In this embodiment, the structural strength and rigidity of the lower box can be enhanced by increasing the thickness of the main beam 21 and the cover 22.

[0036] In some possible embodiments, the edge beam 2 can be an integral extrusion process without weight reduction treatment, has higher strength, can adapt to more severe working conditions, and can withstand greater extrusion pressure. See Figure 2 As shown, the cover 22 is also provided with a notch part 224, and the lower fixing part is exposed to the notch part 224. Thus, the connecting part is connected to the lower fixing part. The lower fixing part can comprise a threaded hole 25 and a connecting hole 26 formed on the main beam 21, and the notch part 224, the threaded hole 25 and the connecting hole 26 can be machined by a milling process.

[0037] In some possible embodiments, see Figure 3 As shown, a recess 23 is formed between the lower surface of the main beam 21 and the lower surface of the water-cooling plate 1. The recess 23 can prevent the edge beam 2 from being forced to be fixed and causing the water-cooling plate 1 to crack when the large surface of the water-cooling plate 1 is deformed.

[0038] In some possible embodiments, the height difference between the lower surface of the main beam 21 and the lower surface of the water-cooling plate 1 is 1 mm to 3 mm. Preferably, the height difference between the lower surface of the main beam 21 and the lower surface of the water-cooling plate 1 is 2 mm.

[0039] Optionally, the main beam 21 is provided with a through groove 24 near the side of the water-cooling plate 1. The through groove 24 extends along the length direction of the main beam 21, and the through groove 24 has a weight reduction effect and can reduce the mutual influence of the water-cooling plate 1 and the edge beam 2.

[0040] In some possible embodiments, the lower fixing part comprises a threaded hole 25 and a connecting hole 26 penetrating through the main beam 21, and the inner wall of the connecting hole 26 is a smooth wall.

[0041] The bracket is provided with a first assembly hole, the shank of the bolt can pass through the first assembly hole in sequence and be threadedly connected to the threaded hole 25, and the cap of the bolt is limited on the bracket. The bracket can be provided with a second assembly hole, the shank of the second bolt can pass through the connecting hole 26 and the second assembly hole in sequence, a nut is connected to the shank, and the nut is limited on the bracket, for example, the nut can be located at the bottom of the bracket.

[0042] In some possible embodiments, the connecting holes 26 extend along the length direction of the main beams 21, thereby reducing the precision requirement of the workpiece manufacturing process.

[0043] In some possible embodiments, the cover shell 22 comprises a top wall 221, side walls 222 and inclined walls 223, the top wall 221 is spaced apart from the main beams 21, the side walls 222 and the inclined walls 223 are arranged on both sides of the top wall 221, the side walls 222 and the inclined walls 223 are connected to the main beams 21, and the upper connecting portion comprises a through hole 2211 arranged on the top wall 221. The upper box body of the battery pack is provided with a fixing hole, and the through hole 2211 and the fixing hole are fixed by using fasteners.

[0044] Optionally, referring to Figure 4 As shown, the main beam 21 of one side edge of the water-cooled plate 1 comprises a plurality of beam segments, each beam segment is connected to the water-cooled plate 1, and each beam segment is sequentially and spaced apart along the edge of the water-cooled plate 1.

[0045] For a low-intensity use scenario, the edge beam 2 can be subjected to weight reduction processing, part of the main beam 21 of the edge beam 2 is removed by a milling process, only the bolt fixing area is reserved, and other parts can be removed by milling processing, so as to reduce the product weight while meeting the strength, and improve the energy density of the system.

[0046] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the scope of the present application, and any simple modification, equivalent change and modification of the above-mentioned technical content without departing from the scope of the present application are still within the scope of the present application.

Claims

1. A lower case of a battery pack, characterized by, The utility model relates to a battery pack cooling system, including: a water cooling plate; a side beam located at the edge of the water cooling plate, and the side beam and the water cooling plate are integrally formed by an extrusion process, the side beam has an upper fixing part and a lower fixing part, the upper fixing part is used for connecting and fixing with the upper box body of the battery pack, and the lower fixing part is used for fixing with a support; a front panel arranged at the edge of the water cooling plate, and the front panel is connected and fixed with the water cooling plate and the side beam.

2. The lower case of the battery pack according to claim 1, characterized by, The side beam includes a main beam connected to the water cooling plate and a cover shell located in the same plane as the water cooling plate. The cover shell is connected to one side of the main beam in the thickness direction. The upper fixing part is arranged on the cover shell, and the lower fixing part is arranged on the main beam.

3. The lower case of the battery pack according to claim 2, characterized by, A notch part is arranged on the cover shell, and the lower fixing part is exposed to the notch part.

4. The lower case of the battery pack according to claim 2, characterized by, A recess part is formed between the lower surface of the main beam and the lower surface of the water cooling plate.

5. The lower case of the battery pack according to claim 4, characterized by, The height difference between the lower surface of the main beam and the lower surface of the water cooling plate is 1mm-3mm.

6. The lower case of the battery pack according to claim 2, characterized by, A through groove is arranged on the side of the main beam close to the water cooling plate.

7. The lower case of the battery pack according to claim 2, characterized by, The lower fixing part includes a threaded hole and a connecting hole penetrating through the main beam, and the inner wall of the connecting hole is a smooth wall surface.

8. The lower case of the battery pack according to claim 7, characterized by, The connecting hole extends along the length direction of the main beam.

9. The lower case of the battery pack according to claim 2, characterized by, The cover shell includes a top wall, a side wall and an inclined wall, the top wall is spaced apart from the main beam, the side wall and the inclined wall are arranged on both sides of the top wall, and the side wall and the inclined wall are connected to the main beam. The upper connecting part includes a through hole arranged on the top wall.

10. The lower case of the battery pack according to claim 2, characterized by, The main beam of the side edge of the water cooling plate includes a plurality of beam segments, each beam segment is connected to the water cooling plate, and each beam segment is sequentially and spacedly arranged along the edge of the water cooling plate.

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