CN214542426U

CN214542426U - Battery pack lower casing

Info

Publication number: CN214542426U
Application number: CN202120651513.4U
Authority: CN
Inventors: 黄毅轩; 曲凡多; 张海建; 孙立新
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2021-03-30
Filing date: 2021-03-30
Publication date: 2021-10-29
Anticipated expiration: 2031-03-30

Abstract

The utility model provides a battery pack lower shell, which comprises a frame, a water cooling plate and a bottom protection plate, wherein the frame is internally fixedly connected with a plurality of crossbeams which are arranged side by side; wherein, be equipped with seal structure between water-cooling board and the frame, and have a plurality of end backplate strengthening ribs of vertically arranging on the backplate at the bottom to be equipped with the sealing strip between backplate at the bottom and water-cooling board, and be formed with inclosed cavity between backplate at the bottom and water-cooling board. Battery package casing down, through setting up crossbeam and end backplate, can effectively promote overall structure's structural strength, and backplate demountable installation at the bottom for overall structure result of use is better, is worth using widely.

Description

Battery pack lower casing

Technical Field

The utility model relates to an automobile battery technical field, in particular to casing under battery package.

Background

With the rise of the revolutionary change of the automobile industry in the present generation, the pure electric automobile is more and more favored by all social circles as a new energy automobile, wherein the endurance and the safety of the electric automobile become key restriction factors for the market acceptance and the trust of customers of the new energy automobile.

At present, most battery packs on the market are regular in size, small in size, simple in structure and few in arrangement aiming at high-energy compact battery packs. Because of the improvement of people's continuation of the journey demand to electric automobile, general car enterprise will adopt under same battery parameter, arranges more batteries, perhaps increases the mode of battery package size to make electric automobile have more excellent continuation of the journey mileage, but along with it, the overall structure intensity of battery package is not enough, and the safety problem does not obtain fine solution.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a battery package casing to can improve overall structure's intensity, and overall structure excellent in use effect.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

a lower shell of a battery pack comprises a frame, a water cooling plate and a bottom protection plate, wherein the frame is fixedly connected with a plurality of cross beams which are arranged side by side inside the lower shell, the water cooling plate is fixedly connected to the bottom of the frame, and the bottom protection plate is detachably and fixedly connected to the bottom of the frame below the water cooling plate; wherein:

the water-cooling plate with be equipped with seal structure between the frame, end backplate stamping forming, just a plurality of end backplate strengthening ribs of vertically arranging have on the backplate at the end, and in the backplate at the end with be equipped with the sealing strip between the water-cooling plate, and in the backplate at the end with be formed with inclosed cavity between the water-cooling plate.

Furthermore, the sealing structure is a structural adhesive layer arranged between the water cooling plate and the frame, and the thickness of the structural adhesive layer is 0.1-3 mm.

Further, the thickness of the sealing strip is 1-6 mm.

Furthermore, the water cooling plate is fixedly connected with the frame and the cross beams through a plurality of drilling screws or water cooling plate mounting bolts.

Furthermore, the flow drilling screws or the water cooling plate mounting bolts are respectively arranged on the frame and the cross beams uniformly or at unequal intervals, and the interval between the adjacent flow drilling screws or the water cooling plate mounting bolts fixedly connected to the frame and the cross beams is 30-150 mm.

Further, the bottom guard plates are fixedly connected to the frame and the cross beams through a plurality of bottom guard plate mounting bolts respectively, the bottom guard plate mounting bolts are uniformly distributed or arranged at unequal intervals on the frame and the cross beams respectively, and the interval between the adjacent bottom guard plate mounting bolts fixedly connected to the frame and the cross beams is 30-150 mm.

Further, corresponding to the bottom guard plate mounting bolt fixedly connected to the beam, a sealing support piece is arranged on the beam or the water cooling plate, the bottom guard plate mounting bolt is fixedly connected to the sealing support piece, or the bottom guard plate mounting bolt penetrates through the sealing support piece and is fixedly connected to the beam, and a sealing ring abutted against the bottom guard plate is arranged on the sealing support piece.

Furthermore, the cross section of the bottom protection plate reinforcing ribs is arched, and the number of the bottom protection plate reinforcing ribs is 2-20.

Further, the end guard plate reinforcing ribs are fixedly connected to the end guard plate, and fixedly connected to the cross beam, the end guard plate mounting bolts penetrate through the end guard plate reinforcing ribs and are arranged corresponding to the part of the end guard plate mounting bolts, and protruding structures abutted to the end guard plate reinforcing ribs are formed on the end guard plate.

Furthermore, at least two opposite side parts of the frame are fixedly connected with an apron board, a battery pack mounting point, a battery pack mounting positioning hole and/or an equipotential mounting point are arranged on the apron board, and an upper shell mounting point is arranged at the top of each cross beam.

Compared with the prior art, the utility model discloses following advantage has:

(1) battery package casing down, through setting up the crossbeam, can effectively improve overall structure's structural strength to can dismantle through the below in the water-cooling board and link firmly at frame bottom backplate, can form effectual protection to the water-cooling board, can improve overall structure's intensity again, simultaneously, the setting dismantled of backplate at the end can realize dismantling alone of backplate at the end, the maintenance and the change of backplate at the end of being convenient for, and then not only improved overall structure's intensity and safety in utilization, and overall structure excellent in use effect.

The sealing structure is arranged between the water cooling plate and the frame, so that the sealing effect between the water cooling plate and the frame can be improved, and the sealing strip is arranged between the bottom protection plate and the water cooling plate, so that the water cooling plate can be prevented from being corroded due to the influence of external factors, and the use safety and the use effect of the whole structure can be further improved; and add bottom plate strengthening rib on the backplate at the bottom, also can effectively improve the structural strength of backplate at the bottom to overall structure's intensity and safety in utilization can further be improved.

(2) The sealing structure adopts a structural adhesive layer, so that the sealing effect between the water cooling plate and the frame is improved; and the thickness of the glue layer is set between 0.1 mm and 3mm, so that relatively optimal use effect can be obtained under the condition of not influencing the arrangement of the whole structure.

(3) The thickness of the sealing strip is set between 1 mm and 6mm, so that relatively optimal sealing effect and use effect can be achieved under the condition that the overall structural arrangement is not influenced.

(4) The water cooling plate is fixedly connected with the frame and each cross beam respectively by using a plurality of flow drilling screws or water cooling plate mounting bolts, the process is mature, the implementation is convenient, the operation is simple, and the cost is low.

(5) The distance between the adjacent drilling screws or the water cooling plate mounting bolts fixedly connected to the frame and each cross beam is 30-150mm, the arrangement is reasonable, the processing is easy, and the relatively optimal connection effect between the water cooling plate and the frame and among the cross beams is favorably achieved.

(6) The bottom guard plate is fixedly connected to the frame and each cross beam by the bottom guard plate mounting bolts, so that the cost is low, the realization is easy, and the operation is simple; the distance between the adjacent bottom guard plate mounting bolts fixedly connected to the frame and each cross beam is 30-150mm, the arrangement is reasonable, the processing is easy, and the relatively optimal connection effect between the bottom guard plates and the frame and between the bottom guard plates and each cross beam is favorably achieved.

(7) The sealing support piece is arranged, connection between the cross beam, the water cooling plate and the bottom guard plate is facilitated, meanwhile, the sealing ring abutted to the bottom guard plate is arranged on the sealing support piece, internal sealing can be formed on the bottom guard plate, and the water cooling plate is prevented from being corroded.

(8) The cross section of the bottom guard plate reinforcing rib is arched upwards so as to further improve the strength and rigidity of the bottom guard plate; and the number of the bottom guard plate reinforcing ribs is between 2 and 20, so that the relatively optimal arrangement effect and the structure reinforcing effect are obtained.

(9) The bottom guard plate is provided with the protruding structure abutted to the reinforcing rib of the bottom guard plate, the structural design is reasonable, and the bottom guard plate, the reinforcing rib of the bottom guard plate and the beam can be installed in a matched mode.

(10) At least, the skirtboard is fixedly connected to two opposite side portions of the frame, the battery pack mounting points and/or the battery pack mounting holes are/is arranged on the skirtboard, the upper shell mounting points are/is arranged at the tops of the cross beams, the structure is reasonable, the mounting stability between the upper shell and the lower shell can be improved, and the overall safety of the battery pack is further improved.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is an exploded view of a lower case of a battery pack according to an embodiment of the present invention;

fig. 2 is a schematic structural view of a bottom guard plate mounting bolt and a sealing support member according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a sealing support according to an embodiment of the present invention;

fig. 4 is another schematic structural view of a seal support according to an embodiment of the present invention;

FIG. 5 is an exploded view of a bottom shield according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a frame according to an embodiment of the present invention;

description of reference numerals:

1. a frame; 101. a cross beam; 1011. mounting an upper shell; 102. a skirt board; 1021. mounting points of the battery pack; 1022. installing a positioning hole in the battery pack; 1023. equipotential mounting points;

2. a water-cooling plate; 3. a bottom guard plate; 301. a bottom guard plate reinforcing rib; 302. a raised structure; 3010. an avoidance structure;

4. a sealing structure; 5. a sealing strip; 6. a flow drill screw; 7. mounting bolts on the bottom guard plate; 701. a screw is arranged on the bottom guard plate; 702. the bottom guard plate is provided with a nut; 8. a seal support; 800. and (5) sealing rings.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The embodiment relates to a lower shell of a battery pack, which comprises a frame 1, a water cooling plate 2 and a bottom protection plate 3, wherein the frame 1 is fixedly connected with a plurality of cross beams 101 which are arranged side by side inside the lower shell, the water cooling plate 2 is fixedly connected to the bottom of the frame 1, and the bottom protection plate 3 is detachably and fixedly connected to the bottom of the frame 1 and is arranged below the water cooling plate 2; wherein, be equipped with seal structure 4 between water-cooling board 2 and frame 1, 3 stamping forming of end backplate, and have a plurality of end backplate strengthening ribs 301 of vertically arranging on the backplate 3 at the bottom to be equipped with sealing strip 5 between backplate 3 at the bottom and water-cooling board 2, and be formed with inclosed cavity between backplate 3 at the bottom and water-cooling board 2.

It should be noted that, in the present embodiment, the structures of the lower case of the battery pack, which are not described, can refer to the common structural parts in the prior art, and are not described herein again. And this embodiment makes end backplate 3 adopt stamping forming, also can effectively improve end backplate 3's structural strength to overall structure's intensity and safety in utilization can further be improved.

Based on the above design concept, an exemplary structure of the lower casing of the battery pack of the embodiment is as shown in fig. 1 to fig. 6, as described above, the lower casing of the battery pack of the embodiment includes a frame 1 fixedly connected with a plurality of beams 101 arranged side by side inside, a water-cooling plate 2 fixedly connected to the bottom of the frame 1, and a bottom guard plate 3 detachably and fixedly connected to the bottom of the frame 1 below the water-cooling plate 2; wherein, be equipped with seal structure 4 between water-cooling board 2 and frame 1, 3 stamping forming of end backplate, and have a plurality of end backplate strengthening ribs 301 of vertically arranging on the backplate 3 at the bottom to be equipped with sealing strip 5 between backplate 3 at the bottom and water-cooling board 2, and be formed with inclosed cavity between backplate 3 at the bottom and water-cooling board 2.

As a preferred embodiment, the sealing structure 4 in this embodiment is a structural adhesive layer disposed between the water-cooling plate 2 and the frame 1, so as to facilitate the improvement of the sealing effect between the water-cooling plate 2 and the frame 1; and the thickness of the structural adhesive layer is between 0.1 and 3mm, so that relatively optimal use effect can be obtained under the condition of not influencing the arrangement of the whole structure. And preferably, the thickness of the sealing strip 5 is between 1 and 6mm, so that relatively optimal sealing effect and use effect can be achieved without influencing the overall structural arrangement. It is worth mentioning that the structural adhesive layers described herein preferably employ conventional structural sealant products.

In this embodiment, as shown in fig. 1, the water-cooling plate 2 is fixedly connected to the frame 1 and each cross beam 101 through a plurality of drilling screws 6 or water-cooling plate mounting bolts; the bolt mounting process by adopting the flow drilling screw 6 or the water cooling plate is mature, convenient to realize, simple to operate and low in cost. And as a further arrangement, the flow drilling screws 6 or the water cooling plate mounting bolts can be respectively uniformly distributed or arranged at unequal intervals on the frame 1 and each cross beam 101, and the interval between the adjacent flow drilling screws 6 or the water cooling plate mounting bolts fixedly connected on the frame 1 and each cross beam 101 is 30-150mm, so that the arrangement is reasonable, the processing is easy, and the relatively optimal connection effect between the water cooling plate 2 and the frame 1 and each cross beam 101 can be obtained.

In order to achieve a better connection effect, as shown in fig. 1, the above-mentioned bottom guard plate 3 is respectively fixedly connected to the frame 1 and each cross beam 101 through a plurality of bottom guard plate mounting bolts 7, the bottom guard plate mounting bolts 7 can be respectively uniformly distributed or unequally spaced on the frame 1 and each cross beam 101, and the spacing between the adjacent bottom guard plate mounting bolts 7 fixedly connected to the frame 1 and each cross beam 101 is 30-150 mm. This structural design arranges rationally, easily processes to do benefit to and obtain the relative optimal connection effect between backplate 3 and frame 1 and each crossbeam 101.

As a further arrangement, as shown in fig. 1 and fig. 2, a sealing support member 8 is provided on the cross beam 101 or the water cooling plate 2 corresponding to the bottom guard plate mounting bolt 7 fixedly connected to the cross beam 101, the bottom guard plate mounting bolt 7 is fixedly connected to the sealing support member 8, or the bottom guard plate mounting bolt 7 penetrates through the sealing support member 8 and is fixedly connected to the cross beam 101, and a sealing ring 800 abutted against the bottom guard plate 3 is provided on the sealing support member 8. Wherein, set up sealing support piece 8, do benefit to the realization crossbeam 101, water-cooling board 2 and end being connected between the backplate 3, simultaneously, be equipped with on sealing support piece 8 with the sealing washer 800 of backplate 3 butt at the end, can form the internal seal to backplate 3 at the end, avoid water-cooling board 2 to receive the corruption.

Still referring to fig. 2, in the specific structure, the above-mentioned bottom guard plate mounting bolt 7 includes a bottom guard plate mounting nut 702 disposed on the cross beam 101, and a bottom guard plate mounting screw 701 used in cooperation with the bottom guard plate mounting nut 702, it can be understood that the bottom guard plate mounting screw 701 passes through the bottom guard plate 3 and the bottom guard plate reinforcing rib 301, and is used in cooperation with the bottom guard plate mounting nut 702 via the sealing support 8, so as to achieve the above-mentioned corresponding use effect; and the use of the bottom guard plate mounting bolt 7 has simple structure, easy realization and convenient replacement and maintenance.

In addition, as shown in fig. 2 to 4, in order to achieve the above-mentioned fastening of the bottom guard plate mounting bolt 7 to the sealing support member 8, or the bottom guard plate mounting bolt 7 penetrates through the sealing support member 8 to be fastened to the cross beam 101, the sealing support member 8 described in this embodiment has two corresponding different structural forms, fig. 3 shows one structural form of the sealing support member 8, which corresponds to the fastening of the bottom guard plate mounting bolt 7 to the sealing support member 8, and fig. 4 shows another structural form of the sealing support member 8, which corresponds to the fastening of the bottom guard plate mounting bolt 7 through the sealing support member 8 to the cross beam 101; meanwhile, a fitting groove for fitting the sealing ring 800 is provided on the sealing support 8 corresponding to the position of the sealing ring 800, so as to achieve the above-mentioned sealing effect, and the fitting groove is not specifically indicated in the drawing.

In this embodiment, as shown in fig. 1 and 5, the cross section of the bottom guard plate reinforcing ribs 301 is arched, the number of the bottom guard plate reinforcing ribs 301 is 2-20, the bottom guard plate reinforcing ribs 301 are matched with the cross beam 101, so that the structural strength of the overall structure of the battery pack lower shell can be effectively improved, when the battery pack lower shell is impacted or extruded, the deformation of the bottom guard plate 3 is small, the water cooling plate 2 can be prevented from being damaged, and the use safety of the overall structure can be further improved. In the concrete structure, the backplate strengthening rib 301 links firmly on backplate 3, and this preferred adoption of the mode of linking firmly is welded, and links firmly backplate construction bolt 7 on crossbeam 101 and wear through backplate strengthening rib 301 setting to corresponding to this part backplate construction bolt 7, be formed with the protruding structure 302 with backplate strengthening rib 301 butt on backplate 3. This protruding structure 302's setting for structural design is reasonable, can do benefit to the cooperation installation between realizing end backplate 3, end backplate strengthening rib 301 and crossbeam 101.

It should be noted that the welding method between the floor reinforcement rib 301 and the floor panel 3 is preferably spot welding. Besides welding the bottom guard plate reinforcing ribs 301 on the bottom guard plate 3 to improve the structural strength of the bottom guard plate 3, the bottom guard plate reinforcing ribs 301 can be directly formed on the bottom guard plate 3 in a press molding mode, and basically the same using effect can be achieved; the bottom guard plate reinforcing rib 301 and the bottom guard plate 3 can be made of different materials except the same material, if the same material is adopted, the bottom guard plate reinforcing rib 301 and the bottom guard plate 3 are preferably fixedly connected in a welding mode, and if the different material is adopted, the bottom guard plate reinforcing rib 301 and the bottom guard plate 3 are preferably fixedly connected in a riveting mode.

Moreover, as shown in fig. 1 and fig. 5, in practical applications, in order to achieve a better matching effect between the bottom guard plate stiffener 301 and the protruding structure 302 and the cross beam 101, corresponding to the protruding structure 302, an avoiding structure 3010 for matching with the installation of the cross beam 101 is provided on the bottom guard plate stiffener 301, and preferably, the avoiding structure 3010 is concavely formed on the bottom guard plate stiffener 301; corresponding to the bottom guard plate mounting bolt 7, mounting avoiding holes are formed in the bottom guard plate reinforcing ribs 301, the bottom guard plate 3 and the protruding structures 302, so that the bottom guard plate reinforcing ribs, the bottom guard plate 3 and the protruding structures can be mounted in a matched mode, and the mounting avoiding holes are not explicitly indicated in the drawing.

In addition, as shown in fig. 1 and fig. 6, in the embodiment, at least two opposite side portions of the frame 1 are fixedly connected to the skirt board 102, a battery pack mounting point 1021, a battery pack mounting positioning hole 1022 and/or an equipotential mounting point 1023 are disposed on the skirt board 102, and an upper housing mounting point 1011 is disposed on the top of each cross beam 101. Through the reasonable setting of above-mentioned structure, can improve the installation stability between casing and the lower casing, and then improve the holistic security of battery package. Of course, the arrangement design of the skirt panels 102 can be adjusted according to actual conditions, so as to achieve relatively optimal use effect.

This embodiment the battery package casing down, through setting up crossbeam 101, can effectively improve frame 1's structural strength to can dismantle through below in water-cooling board 2 and link firmly at frame 1 bottom backplate 3, can form effectual protection to water-cooling board 2, can improve overall structure's intensity again, and simultaneously, can dismantle and link firmly the setting, can realize the independent dismantlement of backplate 3 at the bottom, be convenient for end backplate 3's maintenance and change, and then not only improved overall structure's intensity and safety in utilization, and overall structure excellent in use effect.

The sealing structure 4 is arranged between the water cooling plate 2 and the frame 1, so that the sealing effect between the water cooling plate 2 and the frame can be improved, and the sealing strip 5 is arranged between the bottom protection plate 3 and the water cooling plate 2, so that the water cooling plate 2 can be prevented from being corroded due to the influence of external factors, and the use safety and the use effect of the whole structure can be further improved; the bottom guard plate 3 adopts punch forming, and adds the bottom plate reinforcing rib on the bottom guard plate 3, can effectively improve the structural strength of bottom guard plate 3, so as to further improve the strength and the safety in utilization of the overall structure.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack lower shell is characterized in that: the water cooling device comprises a frame (1) fixedly connected with a plurality of cross beams (101) arranged side by side inside, a water cooling plate (2) fixedly connected to the bottom of the frame (1), and a bottom protection plate (3) which is detachably and fixedly connected to the bottom of the frame (1) and is arranged below the water cooling plate (2); wherein:

the water cooling plate (2) and be equipped with seal structure (4) between frame (1), just end backplate (3) are gone up and have a plurality of end backplate strengthening ribs (301) of vertically arranging, and in end backplate (3) with be equipped with sealing strip (5) between water cooling plate (2), and in end backplate (3) with be formed with inclosed cavity between water cooling plate (2).

2. The battery pack lower case according to claim 1, wherein: the sealing structure (4) is a structural adhesive layer arranged between the water cooling plate (2) and the frame (1), and the thickness of the structural adhesive layer is 0.1-3 mm.

3. The battery pack lower case according to claim 1, wherein: the thickness of the sealing strip (5) is 1-6 mm.

4. The battery pack lower case according to claim 1, wherein: the water cooling plate (2) is fixedly connected with the frame (1) and the cross beams (101) through a plurality of drilling screws (6) or water cooling plate mounting bolts.

5. The battery pack lower case according to claim 4, wherein: the flow drilling screws (6) or the water cooling plate mounting bolts are uniformly distributed or arranged at unequal intervals on the frame (1) and the cross beams (101), and the intervals between the adjacent flow drilling screws (6) or the water cooling plate mounting bolts fixedly connected to the frame (1) and the cross beams (101) are 30-150 mm.

6. The battery pack lower case according to claim 1, wherein: the bottom guard plate (3) is fixedly connected to the frame (1) and the cross beams (101) through a plurality of bottom guard plate mounting bolts (7), the bottom guard plate mounting bolts (7) are uniformly distributed or arranged at unequal intervals on the frame (1) and the cross beams (101), and the interval between the adjacent bottom guard plate mounting bolts (7) fixedly connected to the frame (1) and the cross beams (101) is 30-150 mm.

7. The battery pack lower case according to claim 6, wherein: corresponding to linking firmly on crossbeam (101) end backplate construction bolt (7), in crossbeam (101) or be equipped with sealed support piece (8) on water-cooling board (2), end backplate construction bolt (7) link firmly in on sealed support piece (8), perhaps end backplate construction bolt (7) wear through sealed support piece (8) link firmly in on crossbeam (101), and in be equipped with on sealed support piece (8) with sealing washer (800) of end backplate (3) butt.

8. The battery pack lower case according to claim 1, wherein: the cross section of the bottom protection plate reinforcing ribs (301) is arched upwards, and the number of the bottom protection plate reinforcing ribs (301) is 2-20.

9. The battery pack lower case according to claim 6, wherein: backplate strengthening rib (301) link firmly in on backplate (3), and link firmly in on crossbeam (101) backplate construction bolt (7) wear through backplate strengthening rib (301) set up to corresponding to this part backplate construction bolt (7), in be formed with on backplate (3) with protruding structure (302) of backplate strengthening rib (301) butt.

10. The battery pack lower case according to any one of claims 1 to 9, wherein: at least two opposite side parts of the frame (1) are fixedly connected with a skirt board (102), a battery pack mounting point (1021) and a battery pack mounting positioning hole (1022) and/or an equipotential mounting point (1023) are arranged on the skirt board (102), and an upper shell mounting point (1011) is arranged at the top of each cross beam (101).