CN220138583U

CN220138583U - Concatenation formula battery box and battery package

Info

Publication number: CN220138583U
Application number: CN202321556971.5U
Authority: CN
Inventors: 罗锟; 温盛德; 陈朝海; 陈智伟; 李汶航; 朱容湛; 饶焰; 丁权华
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2023-06-16
Filing date: 2023-06-16
Publication date: 2023-12-05
Anticipated expiration: 2033-06-16

Abstract

The utility model discloses a spliced battery box body, which comprises: the battery module comprises a lower box body, wherein the lower box body comprises a middle plate and two end plates, the two end plates are respectively connected to two ends of the middle plate, and the middle plate and the two end plates are enclosed to form an installation cavity with an opening at one end and used for accommodating the battery module; the reinforcing plate comprises a bottom plate and a side plate which are connected, the bottom plate is connected with the bottom wall of the middle plate, and the side plate is connected with the side wall of the at least one end plate. According to the spliced battery box provided by the utility model, the strength loss at the spliced part and the strength of the end plate are relieved through the reinforcing plate, so that the box has fewer parts and high overall strength. The utility model also discloses a battery pack using the spliced battery box body.

Description

Concatenation formula battery box and battery package

Technical Field

The utility model relates to the technical field of batteries, in particular to a spliced battery box and a battery pack.

Background

With market changes, the life cycle of a product of one model is shorter and the variety is diversified, and mass production modes are gradually becoming unable to adapt to competition.

The power battery pack is a power source of the electric automobile, the electric quantity demand of the battery pack is increased along with the expansion or upgrading of the automobile model of the same platform, the corresponding box body of the battery pack is also increased, and the difficulty of the integrated sheet metal forming process is also increased along with the increase of the box body of the battery pack, so that the cost is higher. Based on this, a spliced battery box is proposed.

When the spliced battery box body is tested, the strength loss is found at the spliced position of the spliced battery box body due to the splice welding, the reinforcing plate is absent at the side wall of the end plate of the sheet metal box body, the local strength of the end plate is weaker, and the risks of vibration failure, extrusion failure, ball impact failure and the like exist.

Therefore, there is a need for a new reinforcement structure for a splice type battery case.

Disclosure of Invention

In order to overcome at least one defect in the prior art, the utility model provides a spliced battery box body, wherein the strength loss at the spliced position and the strength of the reinforced end plate are relieved through the reinforced plate, and the box body has fewer parts and high overall strength.

The utility model adopts the technical proposal for solving the problems that:

a splice battery box comprising:

the battery module comprises a lower box body, wherein the lower box body comprises a middle plate and two end plates, the two end plates are respectively connected to two ends of the middle plate, and the middle plate and the two end plates are enclosed to form an installation cavity with an opening at one end and used for accommodating the battery module;

the reinforcing plate comprises a bottom plate and a side plate which are connected, the bottom plate is connected with the bottom wall of the middle plate, and the side plate is connected with the side wall of the at least one end plate.

Further, the mounting cavity further comprises at least one longitudinal beam positioned at the bottom of the mounting cavity, the longitudinal beam is connected with the middle plate and the at least one end plate, and the longitudinal beam is further connected with the reinforcing plate.

Further, the bottom plate is provided with a convex hull corresponding to the longitudinal beam, the convex hull is covered on the longitudinal beam, and the convex hull is connected with the longitudinal beam.

Further, through grooves which face the bottom opening of the mounting cavity are formed in the longitudinal beams, cavities are formed between the reinforcing plates and the end plates, and the through grooves are communicated with the cavities.

Further, the device also comprises at least one cross beam positioned at the bottom of the installation cavity, and the cross beam is overlapped with the longitudinal beam.

Further, the bottom plate and the side plate are integrally formed through sheet metal stamping.

Further, the bottom plate is welded with the bottom wall of the middle plate through a plurality of first welding points, and pits are arranged on the bottom plate at positions corresponding to the first welding points.

Further, the side plates are welded with the side walls of the end plates through a plurality of second welding points, and the plurality of second welding points are arranged along the edges of the side plates.

Further, the middle plate and/or the end plate are formed by stamping through metal plates, and the middle plate and the end plate are connected through resistance spot welding.

Based on the same conception, the utility model also discloses a battery pack, and the battery pack is applied with the spliced battery box body.

In summary, the spliced battery box and the battery pack provided by the utility model have the following technical effects:

in the spliced battery box body, the bottom plate in the reinforcing plate is connected to the bottom wall of the middle plate, and the side plate in the reinforcing plate is connected to the side wall of the end plate, so that the reinforcing plate is positioned at the splicing position of the middle plate and the end plate, the strength loss caused by splicing the middle plate and the end plate can be relieved, meanwhile, the strength of the end plate can be reinforced by the reinforcing plate, the risks of vibration failure, extrusion failure, ball impact failure and the like are reduced or avoided, and the box body has few parts and high overall strength; the box is further provided with longitudinal beams, and the middle plate, the end plates and the longitudinal beams are reinforced and connected through the reinforcing plates, so that the overall strength of the box is further improved. Other benefits of the utility model will appear in the detailed description.

Drawings

Fig. 1 is a schematic structural diagram of a spliced battery box according to an embodiment of the present utility model;

fig. 2 is an exploded view of a splice battery case according to an embodiment of the present utility model;

FIG. 3 is a schematic structural view of a reinforcing plate according to an embodiment of the present utility model;

FIG. 4 is an enlarged view of part A of FIG. 1;

fig. 5 is a partially enlarged sectional view of a spliced battery case according to an embodiment of the present utility model.

Wherein the reference numerals have the following meanings:

1. a lower box body; 11. a middle plate; 12. an end plate; 13. a mounting cavity; 2. a reinforcing plate; 21. a bottom plate; 22. a side plate; 23. convex hulls; 24. pit; 3. a longitudinal beam; 31. a through groove; 4. a cross beam; 5. a first weld; 6. a second weld; 7. a third welding point; 8. a fourth welding point; 9. a cavity.

Detailed Description

For a better understanding and implementation, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model.

In the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

Referring to fig. 1 and 2, the utility model discloses a spliced battery box body, which can be used for installing a battery module, and comprises: lower box 1, reinforcing plate 2, longeron 3 and crossbeam 4. In addition, the utility model also discloses a battery pack using the spliced battery box body.

Wherein, lower box 1 is the concatenation formula structure, and lower box 1 includes medium plate 11 and two end plates 12, and both ends plates 12 are connected respectively in the both ends of medium plate 11, and medium plate 11 and both ends plates 12 enclose and close and form one end opening and be used for holding battery module's installation cavity 13. In this way, in the lower box 1, the middle plate 11 can be changed to form lower boxes with different length specifications, so as to further meet the expansion or upgrading requirements of the vehicle type of the same platform.

As an example, the two end plates 12 are respectively connected to two ends of the middle plate 11 in the length direction, wherein the bottom wall of the middle plate 11 is a bottom wall body serving as the mounting cavity 13, the side walls of the two end plates 12 and the two side walls of the middle plate 11 enclose a circumferential side wall of the mounting cavity 13, and the upper transverse wall of the middle plate 11 and the upper transverse wall of the two end plates 12 enclose a flange structure of the spliced battery box body for connecting an upper cover.

Preferably, the middle plate 11 may be formed by sheet metal stamping, or may be formed by cutting a base material formed by sheet metal drawing or extrusion.

Preferably, the end plate 12 can be formed by stamping a metal plate, and structural shapes with various purposes can be stamped on the end plate 12 so as to meet various requirements of strength, matching vehicle structures, matching other parts of a battery pack and the like.

The specific shape and specific use of the two end plates 12 may be different (because the vehicle structure and other components of the battery pack to which the two end plates 12 are matched are not identical), and the present utility model is not limited to the two end plates being identical.

Referring to fig. 5, preferably, the middle plate 11 and the end plate 12 are connected by resistance spot welding, compared with a laser welding mode, the resistance spot welding process can reduce or avoid damage to the anti-corrosion layer in the plate, and effectively reduce the cost of anti-corrosion treatment. Specifically, a plurality of fourth welding points 8 are arranged along the joint of the middle plate 11 and the end plate 12, and the fourth welding points 8 are utilized to fix the middle plate 11 and the end plate 12 by resistance spot welding, so that the position and the number of the resistance spot welding can be controlled well.

The reinforcing plates 2 are positioned in the mounting cavity 13, and one reinforcing plate 2 or two reinforcing plates 2 can be arranged; when the reinforcing plate 2 is one, the reinforcing plate 2 is connected between the middle plate 11 and one of the end plates 12; when there are two reinforcing plates 2, different reinforcing plates 2 are respectively connected between the middle plate 11 and different end plates 12.

The stiffening plate 2 has two functions: firstly, the reinforcing plate 2 is covered at the joint of the middle plate 11 and the end plate 12, and the reinforcing effect of the reinforcing plate 2 which is respectively connected with the middle plate 11 and the end plate 12 is utilized to relieve the strength loss caused by the welding of the middle plate 11 and the end plate 12; secondly, the reinforcing plate 2 can be at least partially attached to the middle plate 11 and the end plate 12, so as to be used for reinforcing the strength of the end plate 12, and reducing or avoiding risks of vibration failure, extrusion failure, ball striking failure and the like.

Referring to fig. 3 and 4, specifically, the reinforcing plate 2 includes a bottom plate 21 and a side plate 22 which are connected, preferably, the bottom plate 21 and the side plate 22 are formed by stamping an integral sheet metal to improve the mechanical performance of the reinforcing plate 2, the bottom plate 21 is connected with the bottom wall of the middle plate 11, and the side plate 22 is connected with the side wall of at least one end plate 12, so that the bottom plate 21 in the reinforcing plate 2 is connected with the bottom wall of the middle plate 11, and the side plate 22 in the reinforcing plate 2 is connected with the side wall of the end plate 12, so as to realize the two functions of the reinforcing plate 2, and the box has few parts and high overall strength.

In other preferred embodiments, the bottom plate 21 and the side plate 22 may be welded or riveted.

Referring to fig. 4 and 5, in the present embodiment, the bottom plate 21 is welded to the middle plate 11, specifically, the bottom plate 21 is welded to the bottom wall of the middle plate 11 through a plurality of first welding points 5, preferably, a plurality of first welding points 5 are arranged along the edge of the bottom plate 21, and specifically, a pit 24 is provided on the bottom plate 21 at a position corresponding to the first welding points 5. Pit 24 serves two functions: firstly, the position of the first welding point 5 is determined by the pit 24 when welding operation is convenient; secondly, the pit 24 can enhance the strength of the bottom plate 21, and further enhance the strength of the reinforcing plate 2.

Referring to fig. 4 and 5, in the present embodiment, the side plate 22 is welded to the end plate 12, specifically, the side plate 22 is welded to the side wall of the end plate 12 by a plurality of second welding points 6, and preferably, the plurality of second welding points 6 are arranged along the edge of the side plate 22.

In other preferred embodiments, the bottom plate 21 and the middle plate 11, and the side plates 22 and the end plates 12 may be fixed by riveting or the like.

Referring to fig. 1, in this embodiment, the stringers 3 and the beams 4 are all located at the bottom of the installation cavity 13, the stringers 3 are five, the beams 4 are three, the five stringers 3 are arranged along the length direction perpendicular to the middle plate 11, the three beams are arranged along the length direction parallel to the middle plate 11, the beams 4 are overlapped with the stringers 3, and the main functions of the beams 4 and the stringers 3 are to improve the overall strength of the spliced battery box. Wherein the cross beam 4 may be connected to the bottom wall of the middle plate 11 and to both side walls of the middle plate 11, the stringers 3 may be connected to the bottom wall of the middle plate 11 and to the bottom walls of both end plates 12, or the stringers 3 may be connected to the middle plate 11 and one of the end plates 12 in a staggered manner, in some possible examples the stringers 3 may also be connected to the side walls of the end plates 12. In this way, the longitudinal beams 3 and the transverse beams 4 form a grid structure at the bottom of the mounting cavity 13 so as to improve the overall strength of the spliced battery box body.

Of course, the specific number of the stringers 3 may be one, two, three, etc., and the number of the cross members 4 may be one, two, four, etc., and the number of the stringers 3 and the cross members 4 is not specifically limited in this embodiment.

Preferably, referring to fig. 4 and 5, the stringers 3 are also connected to the reinforcement plate 2, so that the middle plate 11, the end plates 12 and the stringers 3 can be connected in a reinforced manner by means of the reinforcement plate 2. Specifically, the reinforcing plate 2 is welded on the bottom wall of the middle plate 11, the side wall of the end plate 12 and the upper surfaces of the five longitudinal beams 3, so that on the basis of the existing connection of the middle plate 11, the end plate 12 and the longitudinal beams 3, the connection among the three is realized again through the reinforcing plate 2, and the strength of the box body is further improved.

Still preferably, the bottom plate 21 is provided with a convex hull 23 corresponding to the longitudinal beam 3, the convex hull 23 covers the longitudinal beam 3, and the convex hull 23 is connected with the longitudinal beam 3, preferably, the convex hull 23 and the longitudinal beam 3 are welded through a third welding point 7. The convex hull 23 has two functions, among others: firstly, the longitudinal beam 3 is conveniently positioned; secondly, the convex hull 23 can increase the strength of the bottom plate 21, and thus the strength of the reinforcing plate 2.

Referring to fig. 5, in this embodiment, preferably, the longitudinal beam 3 is provided with a through groove 31 that opens towards the bottom of the mounting cavity 13, specifically, the cross section of the longitudinal beam 3 is approximately in an inverted U shape, and the longitudinal beam 3 is buckled at the bottom of the mounting cavity 13; a cavity 9 is formed between the reinforcing plate 2 and the end plate 12, specifically, a part of the side plate 22 is attached to and welded to the side wall of the end plate 12, and a gap is kept between a part of the side plate 22 and the side wall of the end plate 12 to form the cavity 9, wherein the through groove 31 is communicated with the cavity 9. More preferably, the cavity 9 has an open end, the open end of the cavity 9 being located between a portion of the upper edge of the side plate 22 and a portion of the upper edge of the side wall of the end plate 12.

In this way, a space is created between the stringers 3 and the bottom of the installation cavity 13, between the reinforcement plate 2 and the side walls of the end plate 12, which space can be used for cooling and/or routing. In addition, the shape of the cavity 9 can also improve the strength of the reinforcing plate 2, and the shape of the through groove 31 can also improve the strength of the longitudinal beam 3.

Preferably, the whole stamping molding of the reinforcing plate 2 is performed, other parts of the reinforcing plate 2 are tightly attached to the bottom and the side parts of the mounting cavity 13 as much as possible except for the necessary space required by the cavity 9, so that the space in the box is prevented from being wasted, and the maximum space utilization rate is realized while the strength is ensured.

In summary, according to the spliced battery box provided by the utility model, the bottom plate 21 in the reinforcing plate 2 is connected to the bottom wall of the middle plate 11, and the side plate 22 in the reinforcing plate 2 is connected to the side wall of the end plate 12, so that the reinforcing plate 2 is positioned at the splice position of the middle plate 11 and the end plate 12, the strength loss caused by splicing the middle plate 11 and the end plate 12 can be relieved by the reinforcing plate 2, meanwhile, the strength of the end plate 12 can be reinforced by the reinforcing plate 2, the risks of vibration failure, extrusion failure, ball impact failure and the like are reduced or avoided, and the box has few parts and high overall strength; the longitudinal beam 3 is further arranged, and the middle plate 11, the end plate 12 and the longitudinal beam 3 are connected in a reinforcing way through the reinforcing plate 2, so that the overall strength of the box body is further improved; the reinforcing plate 2 with a plurality of shapes (such as the shapes of the convex hulls 23, the pits 24 and the cavities 9) is formed in a sheet metal stamping mode, so that the mechanical property of the reinforcing plate 2 is improved, the installation requirement between the reinforcing plate 2 and other parts is met, a machining mode is replaced, and the strength of the reinforcing plate 2 is improved and meanwhile the cost is saved.

The technical means disclosed by the scheme of the utility model is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the utility model may occur to one skilled in the art without departing from the principles of the present utility model and are intended to be within the scope of the present utility model.

Claims

1. A splice battery box, comprising:

the battery box comprises a lower box body (1), wherein the lower box body (1) comprises a middle plate (11) and two end plates (12), the two end plates (12) are respectively connected to two ends of the middle plate (11), and the middle plate (11) and the two end plates (12) are enclosed to form a mounting cavity (13) with an opening at one end and used for accommodating a battery module;

at least one reinforcing plate (2) located in the installation cavity (13), wherein the reinforcing plate (2) comprises a bottom plate (21) and side plates (22) which are connected, the bottom plate (21) is connected with the bottom wall of the middle plate (11), and the side plates (22) are connected with at least one side wall of the end plate (12).

2. The splice battery box of claim 1, further comprising at least one stringer (3) at the bottom of the mounting cavity (13), the stringer (3) being connected to the middle plate (11) and at least one of the end plates (12), and the stringer (3) being further connected to the stiffener plate (2).

3. The spliced battery box body according to claim 2, wherein a convex hull (23) corresponding to the longitudinal beam (3) is arranged on the bottom plate (21), the convex hull (23) covers the longitudinal beam (3), and the convex hull (23) is connected with the longitudinal beam (3).

4. A spliced battery box according to claim 3, characterized in that the longitudinal beam (3) is provided with a through groove (31) which is open towards the bottom of the mounting cavity (13), a cavity (9) is formed between the reinforcing plate (2) and the end plate (12), and the through groove (31) is communicated with the cavity (9).

5. The splice battery box of claim 2, further comprising at least one cross member (4) located at the bottom of the mounting cavity (13), the cross member (4) overlapping the longitudinal member (3).

6. The spliced battery case according to any one of claims 1 to 5, wherein the bottom plate (21) and the side plate (22) are integrally sheet metal punched.

7. The spliced battery box according to any one of claims 1 to 5, wherein the bottom plate (21) and the bottom wall of the middle plate (11) are welded through a plurality of first welding points (5), and a pit (24) is arranged on the bottom plate (21) at a position corresponding to the first welding points (5).

8. The splice battery box of claim 7, wherein the side plates (22) are welded to the side walls of the end plates (12) by a plurality of second welds (6), the plurality of second welds (6) being aligned along the edges of the side plates (22).

9. Spliced battery case according to any of claims 1 to 5, characterized in that the middle plate (11) and/or the end plates (12) are formed by sheet metal stamping, the middle plate (11) and the end plates (12) being connected by resistance spot welding.

10. A battery pack, wherein the spliced battery case according to any one of claims 1 to 9 is applied.