CN213717002U

CN213717002U - Battery pack and box body thereof

Info

Publication number: CN213717002U
Application number: CN202022648002.5U
Authority: CN
Inventors: 章学俊
Original assignee: Vitesco Automotive Tianjin Co Ltd
Current assignee: Vitesco Automotive Tianjin Co Ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-07-16
Anticipated expiration: 2030-11-16

Abstract

The utility model relates to a battery pack and box thereof, wherein the curb plate and the end plate of box are fixed to the bottom plate in sealed mode through the welding to the bottom plate has flat-plate-shaped main part, this main part has towards the free surface of battery and the free bottom surface of battery dorsad, this main part still has relative first group edge, at least one edge in this first group edge is buckled towards the bottom surface direction of the main part of bottom plate and is formed the kink, this kink is provided with at least one positioning groove, this positioning groove has the degree of depth that extends towards the direction that deviates from this surface from the surface of the main part of bottom plate and the length that extends along the kink in the direction perpendicular to with the degree of depth.

Description

Battery pack and box body thereof

Technical Field

The utility model relates to a vehicle battery technical field especially relates to a novel battery package and box thereof.

Background

A battery pack for an electric vehicle generally includes a plurality of battery cells or battery modules (collectively referred to as battery cells in this application), which are fixedly mounted in a case to secure and protect the battery cells and the battery modules and associated electronics.

In the prior art, the box body is generally composed of a bearing plate, two opposite side plates, two opposite end plates, and a cover plate, the end plates being fixed to a bottom plate, the side plates being fixed to the end plates, and the cover plate being supported on the side plates and the end plates. In order to provide proper support and shock resistance for the battery cells, the base plate is generally made of plastic having both sufficient strength and appropriate elasticity and is formed in a box structure having an inner cavity. For this reason, long bolts are required to pass through the end plate from the upper end surface thereof and extend to the lower surface of the bottom plate to fixedly mount the end plate to the bottom plate. In addition, to prevent moisture or other contaminants from entering the interior cavity of the tank through the apertures between the end and side panels and the bottom panel after the tank has been installed on a vehicle, a sealant is applied to form a seal at the point where the bottom panel and end and side panels are joined to one another.

In the production and use processes, the battery pack and the box body in the prior art are complex in production process, high in cost and low in product reliability. Therefore, a new battery pack and a case structure thereof are needed to overcome the disadvantages of the prior art.

SUMMERY OF THE UTILITY MODEL

The utility model provides a battery pack, include: the battery box at least comprises a bottom plate, a group of opposite side plates and a group of opposite end plates, wherein the bottom plate, the side plates and the end plates jointly form an inner cavity for containing the battery monomer; the side plates and the end plates are fixed to the bottom plate in a sealing manner by welding; the bottom plate is provided with a flat main body, the main body is provided with a surface facing the battery monomer and a bottom surface back to the battery monomer, the main body is also provided with a first group of opposite edges, at least one edge of the first group of edges is bent towards the bottom surface of the main body of the bottom plate to form a bent part, the bent part is provided with a positioning groove, and the positioning groove is provided with a depth extending from the surface of the main body of the bottom plate towards the direction away from the surface and a length extending along the bent part in the direction perpendicular to the depth.

Advantageously, the fixing plate further comprises a fixing plate, the fixing plate is provided with a bottom surface facing the bottom plate and a surface facing away from the bottom plate, the fixing plate is further provided with a screw hole for a bolt to pass through so as to fixedly connect the fixing plate to an external support and a positioning projection matched with the positioning groove.

Advantageously, at least one edge of the base plate has a plurality of locating recesses formed in the surface by stamping.

Advantageously, a support plate is further included, arranged below the bottom plate, which support plate is made of plastic and is formed with an inner cavity.

Advantageously, the surface of the support plate is provided with a receptacle for receiving the positioning groove.

Advantageously, the base plate has a second set of opposed edges, at least one edge of the second set of edges being provided with bolt holes.

Advantageously, the base, side and end panels are made of a metallic or composite material.

Advantageously, the end plate has a thickness greater than the thickness of the side plates.

The utility model also provides a box that is arranged in holding the battery cell in the battery package, this box includes: the battery comprises a bottom plate, an opposite group of side plates and an opposite group of end plates, wherein the bottom plate, the side plates and the end plates jointly form an inner cavity for accommodating a battery monomer; the side plates and the end plates are fixed to the bottom plate in a sealing manner by welding; the bottom plate is provided with a flat main body, the main body is provided with a surface facing the battery monomer and a bottom surface back to the battery monomer, the main body is also provided with a first group of opposite edges, at least one edge of the first group of edges is bent towards the bottom surface of the main body of the bottom plate to form a bent part, the bent part is provided with at least one positioning groove, and the positioning groove is provided with a depth extending from the surface of the main body of the bottom plate towards the direction away from the surface and a length extending along the bent part in the direction perpendicular to the depth.

Drawings

Further details and advantages of the invention will be further described below with reference to the accompanying drawings, in which:

fig. 1 shows a battery pack according to the present invention, wherein the cover plate of the case is omitted to show the battery cells inside the battery pack;

FIG. 2 is a bottom panel of the case of the battery pack of FIG. 1;

FIG. 3 is a bottom plate and a support plate of the battery pack case of FIG. 1 mated with each other;

FIG. 4 is a schematic view of the battery pack of FIG. 1 as mounted to an external structure;

FIG. 5 is an exploded view of FIG. 4;

FIG. 6 is an enlarged view of a portion of FIG. 4 about the anchor sheet;

fig. 7 is a cross-sectional view of the area indicated in fig. 4 with respect to fig. 6.

The drawings described above are for illustration and example only and are not drawn to scale nor are all of the components or details associated with a particular use environment fully drawn. Those skilled in the art will appreciate that the conception and specific use of the invention may be readily utilized as a basis for the designing of other structures, methods and systems for carrying out the several purposes of the present invention.

Detailed Description

The terms "first," "second," and the like, as may be used in the following description, are not intended to limit any order, but merely to distinguish between various individual components, features, structures, elements, and the like, which may be the same, similar, or different. Meanwhile, descriptions about orientations, such as "upper", "lower", "inner", "outer", "left", "right", "radial", "axial", and the like, which may be used in the following description, are only for convenience of description unless explicitly stated, and are not intended to form any limitation on the technical solution of the present invention.

Fig. 1 is a schematic view of a specific example of a battery pack according to the present invention. As shown, the battery pack has a plurality of battery modules or cells (collectively referred to herein as cells 10) combined in series and parallel with each other, and the cells are housed in a case 20 together with associated electronic devices such as a battery monitoring and management device (not shown) and the like for securing and protecting. The housing has a mounting structure to enable fixed mounting to an external structure such as a vehicle chassis.

The case 20 includes a bottom plate 30, an end plate 40, a side plate 50, and a cover plate (not shown), which together define a sealed receptacle for receiving the battery cell 10. The side plates and the end plates in the present application are fixed to the bottom plate in a sealed manner by welding. For this reason, the bottom plate, the side plates, and the end plates are preferably made of weldable metal materials, and good welding strength is obtained at a low cost. Alternatively, the bottom, side and end plates may be made of a composite material that can be sealingly fixed to each other by welding, such as a high strength composite material.

Further, the base plate 30 is used in conjunction with the support plate 70, wherein the base plate 30 is, for example, a thin metal plate, and has a thickness only for supporting welding and providing a short-term lightweight impact protection for the battery cells, while the support plate 70 is provided under the base plate 30 to provide a conventional support and protection for the battery cells. The support plate 70 is made of a material having sufficient strength and suitable elasticity, such as plastic, and the support plate 70 may be made in a hollow structure, such as a honeycomb, thereby effectively saving material costs and providing better elastic support and protection than a single solid metal base plate of the prior art.

In addition, the thickness of the end plate 40 of the case 20 is much greater than that of the side plate 50 and the bottom plate 30 because the battery cells are accelerated in the direction of the end plate due to acceleration or deceleration of the vehicle during running, thereby causing a strong impact to the end plate, and the end plate needs to use a thick material to provide sufficient strength. The side plates are less subject to impact than the end plates, so that a smaller thickness can be set. Accordingly, the battery pack may be configured such that the end plates of the case extend in the lateral direction of the vehicle, or the side plates extend in the direction along the vehicle. The design can further save the material consumption of the box body, thereby reducing the cost of the box body.

The housing also includes a fixed mounting structure for fixedly mounting the housing and, in turn, the battery pack to an external structure, such as a vehicle floor or a transportation device. Referring to fig. 2, the base plate 30 is substantially square and has a substantially flat plate-shaped body including a surface facing the battery cell and a bottom surface facing away from the battery cell and facing the support plate. The base plate defines a first set of opposed edges aligned with the horizontal plane of the body and a second set of opposed edges, with bolt holes 32 provided near the edges for passing bolts therethrough as needed to secure the base plate and support plate 70 to each other or to secure the base plate and, thus, the entire battery pack to an external structure, such as during transport, to form a temporary securement.

The second set of edges of the bottom plate 30 are bent at an angle toward the bottom surface to form a bent portion, and the surface of the bent portion is formed with a plurality of positioning grooves 31 by, for example, punching, for fixing the bottom plate and, thus, the entire battery pack to an external structure in cooperation with the fixing pieces 60. The positioning groove has a depth extending from the surface of the main body of the floor panel in a direction away from the surface and a length extending along the entire bent portion in a direction perpendicular to the depth, the depth and the length affecting the mounting strength of the battery pack on the vehicle.

With further reference to fig. 3, during use, the base plate 30 is supported above the support plate 70. The support plate 70 has substantially the same shape as the bottom plate 30, and the bottom plate 70 and the support plate 30 are closely fitted to each other in order to obtain a compact structure. For this purpose, the edge portions of the support plate which engage the floor curve preferably have corresponding curved surfaces, in particular the surface of the support plate 70 is provided with a receptacle 71 for receiving said first positioning groove 31.

Referring to fig. 4 to 7, the battery pack is fixedly mounted to an external structure such as a chassis of a vehicle by the fitting of the positioning groove 31 and the fixing piece 60 on the bottom plate 30 thereof to each other. The fixing piece 60 is a long flat plate having a bottom surface facing the base plate and a surface facing away from the base plate in a use state. The fixing plate is, for example, a metal plate formed by punching, and is provided with a screw hole 62 for allowing a bolt to pass therethrough to fixedly attach the fixing plate to the external bracket. Meanwhile, the fixing piece is provided at an edge portion with a positioning projection 61, such as by punching, the positioning projection 61 projecting from the main body toward the bottom surface and having a shape and a size such that the positioning projection 61 can be fitted into the corresponding positioning groove 31 on the bottom plate 30.

In use, the portion of the fixing piece 60 provided with the positioning projection 61 is overlapped on the surface of the base plate 30, and the positioning projection 61 of the fixing piece is caught in the positioning groove 31 of the base plate 30, so that the base plate and the fixing piece are fixed to each other in the horizontal direction. Meanwhile, the portion of the fixing plate 60 provided with the screw hole 62 is overlapped onto a surface of an exterior member such as a vehicle chassis, wherein the screw hole 62 on the fixing plate is aligned with the corresponding bolt hole of the exterior member 90, so that the fixing plate 60 can be fixed to the exterior member 90 by passing the bolt 80 through the fixing plate 60 and the exterior member 90 and by means of the nut 81. To this end, the fixing tabs 60 are fixed to the external structure 90 by bolts 80, the base plate 30 is restricted from moving in the horizontal direction due to the positioning protrusions 31 on the fixing tabs, and is fixed in the vertical direction due to the bottom surfaces of the fixing tabs, and the base plate 30 and the entire battery pack are fixed to the external structure 90.

In the above figures, although the bottom plate 30 is shown as having 5 detents, it may be provided in other numbers, such as 1, 2, 3, 4 or even a greater number of detents, as desired. Furthermore, although the present application describes that the end plate is fixedly connected to the base plate by welding, if necessary, threaded holes may be further provided through the end plate, thereby allowing additional mutual fixing between the end plate and the base plate and the support plate or fixing of the battery box on an external structure by means of bolts.

The foregoing description is only exemplary of some embodiments of the principles and spirit of the present invention. It will be appreciated by those skilled in the art that changes may be made in the described examples without departing from the principles and spirit thereof, and that such changes are contemplated by the inventors and are within the scope of the invention as defined in the appended claims.

Claims

1. A battery pack, comprising:

a battery cell (10); and

the battery pack comprises a box body (20) and a battery pack, wherein the box body at least comprises a bottom plate (30), a group of opposite side plates (50) and a group of opposite end plates (40), and the bottom plate (30), the side plates (50) and the end plates (40) jointly form an inner cavity for containing a battery cell;

it is characterized in that the preparation method is characterized in that,

the side plates (50) and the end plates (40) are fixed to the bottom plate (30) in a sealed manner by welding;

the bottom plate (30) is provided with a flat main body, the main body is provided with a surface facing the battery cell and a bottom surface back to the battery cell, the main body is also provided with a first group of opposite edges, at least one edge of the first group of edges is bent towards the bottom surface of the main body of the bottom plate to form a bent part, the bent part is provided with a positioning groove (31), and the positioning groove is provided with a depth extending from the surface of the main body of the bottom plate towards the direction away from the surface and a length extending along the bent part in the direction perpendicular to the depth.

2. The battery pack according to claim 1, further comprising a fixing piece (60) having a bottom surface facing the bottom plate and a surface facing away from the bottom plate, the fixing piece being further provided with a screw hole (62) through which a bolt is passed to fixedly attach the fixing piece to an external bracket and a positioning protrusion (61) matching with the positioning groove (31).

3. The battery pack according to claim 1 or 2, wherein at least one edge of the bottom plate has a plurality of positioning grooves (31) formed in a surface by punching.

4. The battery pack according to claim 1 or 2, further comprising a support plate (70) disposed below the bottom plate, the support plate being made of plastic and formed with an inner cavity.

5. Battery pack according to claim 4, characterized in that the surface of the support plate (70) is provided with a receptacle for accommodating the positioning groove (31).

6. A battery pack, according to claim 1 or 2, characterized in that said bottom plate (30) has a second set of opposite edges, at least one edge of which is provided with bolt holes.

7. The battery pack according to claim 1 or 2, wherein the bottom plate (30), the side plate (50), and the end plate (40) are made of a metal material or a composite material.

8. The battery pack according to claim 1 or 2, wherein the end plate has a thickness greater than that of the side plate.

9. A case for accommodating battery cells in a battery pack, the case comprising: the battery comprises a bottom plate (30), an opposite group of side plates (50) and an opposite group of end plates (40), wherein the bottom plate (30), the side plates (50) and the end plates (40) jointly form an inner cavity for accommodating a battery cell;

it is characterized in that the preparation method is characterized in that,

the bottom plate (30) is provided with a flat main body, the main body is provided with a surface facing the battery cell and a bottom surface back to the battery cell, the main body is also provided with a first group of opposite edges, at least one edge of the first group of edges is bent towards the bottom surface of the main body of the bottom plate to form a bent part, the bent part is provided with at least one positioning groove (31), and the positioning groove is provided with a depth extending from the surface of the main body of the bottom plate towards the direction away from the surface and a length extending along the bent part in the direction perpendicular to the depth.

10. A cabinet according to claim 9, further comprising a fixing piece (60) having a bottom surface facing the bottom plate and a surface facing away from the bottom plate, the fixing piece being further provided with a screw hole (62) through which a bolt passes to fixedly attach the fixing piece to an external bracket and a positioning projection (61) matching with the positioning groove (31).