CN109786594B - Electric automobile and battery shell body thereof - Google Patents

Abstract

The invention provides an electric automobile and a battery pack shell thereof, wherein the strength of the battery pack shell is increased through the arrangement of side beams, and then a vibration test is passed. The battery pack shell comprises a lower shell with a containing cavity for containing a battery pack, side beams arranged on the left side and the right side of the lower shell, and a rear end beam arranged at the rear end of the lower shell; the left side and the right side of the rear end beam are respectively connected with the rear ends of the side beams on the same side so as to be connected with each other to form a side beam body surrounding the periphery of the lower shell. The side beam body can effectively and comprehensively protect the lower shell, and the overall strength of the lower shell is improved; the lower shell is connected with the vehicle body by means of the side beam body, and the load of the battery pack is finally transmitted to the longitudinal beam of the vehicle body through the side beam body, so that acting force acting on the module mounting plate and the lower shell is reduced, the whole lower shell is not easy to deform, and the strength of the lower shell is greatly improved.

Description

Electric automobile and battery shell body thereof

Technical Field

The invention relates to the technical field of electric automobiles, in particular to an electric automobile and a battery pack shell thereof.

Background

Before the battery pack is sold in a factory, the battery pack must pass a vibration test specified by the state, such as the safety requirement and the test method of GB/T31467.3 lithium ion power storage battery pack and System for a power automobile.

The vibration test has very high strength requirements on the battery pack shell, the battery pack shell comprises an upper shell and a lower shell, the upper shell and the lower shell are covered up and down, the lower shell is provided with a containing cavity of the battery pack, a main body part of the battery pack shell is formed and is a main stress part, the lower shell adopts a DC06 steel plate with the thickness of 1.0mm, the self strength of the lower shell is low, and the damage to the shell caused by the vibration test cannot be borne.

Therefore, there is a need to design an electric vehicle and a battery pack case thereof to enhance the strength of the battery pack case.

Disclosure of Invention

The invention aims to provide an electric automobile and a battery pack shell thereof, and the strength of the battery pack shell is increased through the arrangement of side beams, so that a vibration test is passed.

In order to achieve the above object, the present invention provides a battery pack case of an electric vehicle, comprising a lower case having a receiving chamber for receiving a battery pack, side members mounted on both left and right sides of the lower case, and a rear end member mounted on a rear end of the lower case; the left side and the right side of the rear end beam are respectively connected with the rear ends of the side beams on the same side so as to be connected with each other to form a side beam body surrounding the periphery of the lower shell.

The invention provides a battery pack shell, wherein a side beam and a rear end beam are arranged on the periphery of a lower shell for bearing a battery pack, and the side beam and the rear end beam are connected into a side beam body with an integral structure, so that the lower shell is effectively and comprehensively protected, the integral strength of the lower shell is improved, and the structural stability of the lower shell in the surrounding direction of the lower shell can be improved, so that the battery pack shell can pass a vibration test. And the side beam body comprises side beams positioned at the left side and the right side of the lower shell, and the side beams can realize the protection of the side face of the lower shell and improve the side collision capacity of the lower shell in a targeted manner. Moreover, the boundary beam body surrounds the periphery of the lower shell, at this moment, the lower shell is not directly connected with the vehicle body, but is connected with the vehicle body by means of the boundary beam body, at this moment, the load of the battery pack inside the lower shell is finally transferred to the longitudinal beam of the vehicle body through the boundary beam body, so that the acting force acting on the module mounting plate for mounting the battery pack and the lower shell is reduced, the whole lower shell is not easy to deform, and the strength of the lower shell is greatly improved.

Optionally, the side member includes an inner plate and an outer plate welded to each other, and the inner plate is welded to a side surface of the lower case.

Optionally, the vehicle body further comprises a first reinforcement connected to the inner side surface of the inner plate and a second reinforcement connected to the inner side surface of the outer plate, wherein the first reinforcement and the second reinforcement are arranged at positions corresponding to the impact points of the side collision.

Optionally, the inner plate and the outer plate are both in a U shape with a transverse opening, the inner plate accommodates the first reinforcement in the opening of the U shape, the outer plate accommodates the second reinforcement in the opening of the U shape, and the inner plate is mounted at the opening of the U shape of the outer plate.

Optionally, end plates are plugged at the ports of the front end and the rear end of the inner plate and the outer plate.

Optionally, the end plate includes baffle and the hem of connecting in the upper and lower both sides of baffle that the shutoff was used, inner panel with the planking with the upper edge of each with behind the hem overlap joint of upside adopts three-layer spot welding to connect to with the lower edge of each behind the hem overlap joint adopts three-layer spot welding.

Optionally, the first reinforcement and/or the second reinforcement are/is a reinforcement plate, the front end and the rear end of the reinforcement plate are provided with U-shaped connecting parts with openings in the front-rear direction, the first reinforcement is connected with the corresponding edges of the inner plate and the outer plate by three layers of spot welding after being lapped with the upper and the lower edges of the U-shaped connecting parts, and the second reinforcement is connected with the corresponding edges of the outer plate by two layers of spot welding after being lapped with the upper and the lower edges of the U-shaped connecting parts.

Optionally, the front end and the rear end of the reinforcing plate are provided with connecting lugs extending back and forth, and the connecting lugs are in lap welding connection with the inner side surfaces of the transverse parts of the inner plate or the outer plate.

Optionally, the reinforcing plate is provided with a via hole.

Optionally, side reinforcing members are connected to the left and right sides of the rear end beam obliquely inward from front to rear, and the front ends of the side reinforcing members are connected to the rear ends of the side beams.

Optionally, both ends of the side reinforcement are connected to the side member and the rear end member by carbon dioxide welding.

Optionally, the side beams and/or the inner side surface of the rear end beam are provided with avoiding structures.

Optionally, the avoidance structure is a notch arranged in a zigzag manner.

Optionally, the welding fixture further comprises a module mounting plate welded on the inner side surface of the lower shell and a shell reinforcing plate welded on the outer side surface of the lower shell, wherein the module mounting plate is welded on the inner side of the lower shell and the shell reinforcing plate is welded on the outer side of the lower shell in one section of the lower shell, so that three-layer spot welding is formed; and/or the outer side of the lower shell is welded with the shell reinforcing plate and the side beam in sequence to form three-layer spot welding.

Optionally, in one of the sections of the rear end beam, the lower shell and the module mounting plate are sequentially overlapped from outside to inside and then are connected by three layers of spot welding.

The invention also provides an electric automobile, which comprises the battery pack shell.

Drawings

Fig. 1 is a top view of a battery pack case of an electric vehicle according to an embodiment of the present invention;

FIG. 2 is a top view of a side rail body in the battery pack case of FIG. 1;

FIG. 3 is a schematic view of the side rail body of FIG. 2 in an assembled and disassembled state;

FIG. 4 is a schematic perspective view of a side sill of the side sill body of FIG. 2 in one arrangement;

FIG. 5 is a schematic view of the side member of FIG. 4 in an assembled and disassembled state;

FIG. 6 is a top view of the side beam of FIG. 4;

FIG. 7 is a cross-sectional view taken along the direction A-A in FIG. 6;

FIG. 8 is a cross-sectional view taken in the direction B-B of FIG. 6;

FIG. 9 is a cross-sectional view taken along the direction C-C in FIG. 6;

FIG. 10 is an exploded view of the rear end rail of the side rail body of FIG. 2 in one arrangement;

FIG. 11 is a cross-sectional view taken along the direction D-D in FIG. 1;

FIG. 12 is a cross-sectional view taken along the direction E-E in FIG. 1;

Fig. 13 is a cross-sectional view in the direction F-F of fig. 1.

In fig. 1-13:

The lower case 1, the side members 2, the inner plate 21, the outer plate 22, the end plate 23, the baffle 231, the folded edge 232, the rear end beam 3, the first reinforcement 4, the second reinforcement 5, the reinforcement plate 6, the through hole 61, the U-shaped connecting portion 7, the connecting lugs 8, the side reinforcement 9, the escape structure 10, the module mounting plate 11, the case reinforcement plate 12, and the case mounting member 13.

Detailed Description

The invention provides an electric automobile and a battery pack shell thereof, wherein the strength of the battery pack shell is increased through the arrangement of side beams, and then a vibration test is passed.

The present invention is specifically described below with reference to the accompanying drawings so that those skilled in the art can accurately understand the technical scheme of the present invention.

The directions of up, down, left, right and the like described herein refer to a normal use state of the electric vehicle, and refer to a traveling direction of the electric vehicle as a front direction and a direction opposite to the front direction as a rear direction; in the horizontal plane, the direction vertical to the front and back is the left-right direction, the direction at the left hand side is left and the direction at the right hand side is right when seen along the running direction of the electric automobile; the direction perpendicular to the ground is taken as the up-down direction, the direction perpendicular to the ground is taken as the down direction, and the direction perpendicular to the ground is taken as the up direction. For convenience of description, the up-down direction is defined as the Z direction. The longitudinal direction described herein corresponds to the front-rear direction, and the transverse direction corresponds to the left-right direction.

The inner and outer directions described herein are defined with reference to the central axis of the battery pack case, specifically, the central axis of the lower case 1 may be referred to, in the lateral direction, the direction near the longitudinal central axis of the lower case 1, and in the longitudinal direction, the direction near the transverse central axis of the lower case 1, unless otherwise specified.

The terms first, second, etc. used herein are used for distinguishing between similar structures or between two or more elements having the same or similar structure and not for describing a particular limitation on the order of arrangement.

As shown in fig. 1-2, the battery pack case of the present invention comprises a lower case 1 and a side beam body connected to the outer periphery of the lower case 1, wherein the lower case 1 has a receiving chamber for receiving a battery pack, i.e., the battery pack is mounted in the receiving chamber, that is, the lower case 1 is a main carrier of the battery pack; the side beam body specifically includes a side beam 2 and a rear end beam 3, the side beam 2 is mounted on the left and right sides of the lower case 1, the rear end beam 3 is mounted on the rear end of the lower case 1, and the left end of the rear end beam 3 is connected with the side beam 2 on the left side, and the right end is connected with the side beam 2 on the right side, thereby being connected to form the side beam body around the outer periphery of the lower case 1, as shown in fig. 1.

Therefore, the boundary beam body surrounds the periphery of the lower shell 1 and is connected into a whole, so that the structural strength and stability of the lower shell 1 in the surrounding direction are enhanced, and the overall strength of the lower shell 1 is improved; more importantly, the boundary beam body surrounds the periphery of the lower shell 1, at this time, the lower shell 1 is not directly connected with the vehicle body, but is connected with the vehicle body through the boundary beam body, so that the force of the battery pack acting on the lower shell 1 can be effectively transferred to the longitudinal beam of the vehicle body through the boundary beam body, and the load is carried through the boundary beam body and the longitudinal beam of the vehicle body, so that the lower shell 1 is prevented from being broken or invalid due to overlarge stress, the use reliability of the lower shell 1 is improved, and the service life of the lower shell 1 is prolonged.

The outer periphery of the lower case 1 is a substantially square body with an upper end opening, and at this time, the other sides except the bottom plate are sequentially connected to form a closed structure, and the surrounding direction of the closed structure is the direction in which the outer periphery of the lower case 1 is located. That is, the lower case 1 is not cylindrical, and its outer periphery or its surrounding direction is not a ring shape in a strict sense, but means an extending direction of a closed structure formed by connecting the front, rear, left, and right sides thereof.

As shown in fig. 3, the battery pack case of the present invention further includes a side reinforcement 9 that is inclined inward from front to rear and is connected to the left and right sides of the rear end rail 3, wherein the front end of the side reinforcement 9 connected to the left is connected to the rear end of the left side rail 2 and the front end of the side reinforcement 9 connected to the right is connected to the rear end of the right side rail 2. Or, the left side reinforcement 9 is inclined from front to back to right, the front end is connected with the left side beam 2, the rear end is connected with the left side of the rear end beam 3, and the connection between the left side beam 2 and the rear end beam 3 is realized; the right side reinforcement 9 is inclined from front to back to left, and has a front end connected to the right side member 2 and a rear end connected to the right side of the rear end member 3, thereby connecting the right side member 2 to the rear end member 3. Therefore, the structure of the side beam 2 is simplified, and the disassembly and assembly convenience is improved.

Both ends of the side reinforcement 9 may be connected to the side sill 2 and the rear end sill 3, respectively, by carbon dioxide welding. Specifically, the rear end of the side reinforcement 9 may be overlapped with the left or right end of the rear end beam 3, and then two-layer spot welding may be performed on the left and right ends of the rear end beam 3.

As shown in fig. 2 and 3, the inner side surface of the rear end beam 3 is provided with an avoidance structure 10, and the inner side surface of the side beam 2 may also be provided with an avoidance structure 10 for avoiding the mutual interference of the battery pack or other components to be mounted in the lower housing 1.

In this embodiment, the avoidance structure 10 may be specifically a notch that is arranged in a zigzag shape, and a person skilled in the art may set the number and the positions of the notches according to the needs; when a plurality of notches are provided, the notches are spaced apart from the inner side surface of the rear end beam 3 or the side member 2.

As shown in fig. 4 and 5, in the present invention, the side member 2 may include an inner plate 21 and an outer plate 22 welded to each other, wherein the inner plate 21 is welded to a side surface of the lower case 1, and the outer plate 22 is connected to an outer side of the inner plate 21.

The inner plate 21 and the outer plate 22 are matched with each other, so that the side beam 2 has higher strength, the impact force of side collision can be effectively resisted, and the protection capability of the lower shell 1 is improved.

The first reinforcement 4 may be further provided on the inner side surface of the inner panel 21, the second reinforcement 5 may be provided on the inner side surface of the outer panel 22, and both the first reinforcement 4 and the second reinforcement 5 may be provided at positions corresponding to the impact points of the side collision.

It will be appreciated by those skilled in the art that when a vehicle body is subject to a side impact, the impact force experienced by the impact point is greatest and the injury is greatest, while a battery pack case located within the vehicle is subject to the greatest impact force at a location corresponding to the impact point, which may damage the battery pack case. However, since the impact force of the side collision is too large, the side member 2 formed solely by the inner panel 21 and the outer panel 22 may not be resisted, and eventually the lower case 1 may be deformed. Therefore, the side member 2 of the present invention is provided with the first reinforcement 4 and the second reinforcement 5 at positions corresponding to the impact point, and the inner panel 21 and the outer panel 22 are reinforced, respectively, so that four layers of protection are formed at positions corresponding to the impact point, namely, the outer panel 22→the second reinforcement 5→the inner panel 21→the first reinforcement 4, which are arranged in order from outside to inside, thereby reliably protecting the lower case 1 from deformation due to a side collision.

The position corresponding to the impact point is not limited to the projected position of the impact point of the side collision in the lateral direction, and may be an impact region formed by diffusing a certain area outward from the projected position.

In the present embodiment, both the inner plate 21 and the outer plate 22 may be provided as U-shaped plates with the openings of the U-shaped plates facing in the lateral direction, with the openings of the inner plate 21 and the outer plate 22 thereof facing to the right for the left side member 2, and with the openings of the inner plate 21 and the outer plate 22 thereof facing to the left for the right side member 2. The U-shaped plate is arranged in the vertical direction by two opposite vertical edges which are parallel to each other and serve as an upper edge and a lower edge respectively, and a transverse edge between the two vertical edges serves as a side edge.

For the inner plate 21 and the outer plate 22 of the U-shaped plate structure, the inner plate 21 may accommodate the first reinforcement 4 in the opening of the U-shape thereof, the outer plate 22 may accommodate the second reinforcement 5 in the opening of the U-shape thereof, at this time, the inner plate 21 may be installed at the opening of the U-shape of the outer plate 22, and the lower case 1 may be installed at the opening of the U-shape of the inner plate 21, with a space for accommodating the second reinforcement 5 between the inner plate 21 and the outer plate 22, and a space for accommodating the first reinforcement 4 between the inner plate 21 and the lower case 1. In this way, not only the mounting of the first reinforcement 4 and the second reinforcement 5 can be achieved, but also the lateral dimension of the side member 2 can be increased to extend the distance of action at the time of a side collision (i.e., the distance from the point of impact to the lower case 1) and to improve the safety protection capability for the lower case 1.

End plates 23 may be provided at both the front and rear ends of the inner plate 21 and the outer plate 22 to block the ports at both the front and rear ends of the inner plate 21 and the outer plate 22, improving the strength and the sealing property of the side member 2.

As shown in fig. 5,6 and 7, the end plate 23 may include a baffle 231 for blocking a port and flanges 232 connected to both upper and lower sides of the baffle 231, wherein the upper edge of the outer plate 22, the upper edge of the inner plate 21 and the flanges 232 at the upper side of the baffle 231 are sequentially overlapped from outside to inside, and then are connected by three-layer spot welding; the lower edge of the outer panel 22, the lower edge of the inner panel 21, and the folded edges 232 on the lower side of the baffle 231 are sequentially overlapped from outside to inside, and then are connected by three-layer spot welding. The inner and outer sides are defined herein with reference to the inner plate 21 and the outer plate 22, and the inner plate 21 and the outer plate 22 are U-shaped, so that the area enclosed between the two sides of the U-shape is inner, the area outside the two sides is outer, specifically, the direction approaching the central axis of the U-shape is inner, and the direction separating from the central axis is outer.

Meanwhile, as shown in fig. 5 and 7, the left and right sides of the baffle 231 may be folded to form a flange structure, and one of the flanges may be overlapped with the side edge of the outer panel 22, and then connected by two-layer spot welding. The adoption of the folded edge 232 and the structure form of the folded edge is convenient for realizing the connection of the end plate 23, and the strength and the connection reliability of the end plate 23 can be improved.

In the invention, the first reinforcing member 4 and the second reinforcing member 5 can be arranged as a reinforcing plate 6, the front end and the rear end of the reinforcing plate 6 are provided with U-shaped connecting parts 7 with openings in the front-rear direction, the opening of the U-shaped connecting part 7 at the front end of the reinforcing plate 6 faces forwards, and the opening of the U-shaped connecting part 7 at the rear end faces backwards; specifically, the U-shaped connecting portion 7 at the front end may be connected to the front side of the reinforcing plate 6 at its lateral portion, and the U-shaped connecting portion 7 at the rear end may be connected to the rear side of the reinforcing plate 6 at its lateral portion. The U-shaped connecting portion 7 may extend from left to right by a predetermined thickness, be connected to the reinforcing plate 6 at one edge in the left-right direction thereof, and be connected to the reinforcing plate 6 to form a stepped structure so as to support the reinforcing plate 6 at one side portion in the left-right direction thereof, and the U-shaped connecting portion 7 corresponds to a support leg of the reinforcing plate 6 when seen in the left-right direction, and support the reinforcing plate 6 to the outer plate 22 or the inner plate 21, as shown in fig. 5. And, this U type connecting portion 7 can be with reinforcing plate 6 integrated into one piece, has improved the intensity of whole first reinforcement 4 or second reinforcement 5, is favorable to strengthening its ability of anti side collision.

Or the front edge of the reinforcing plate 6 can be used as the transverse part of the front U-shaped connecting part 7, the rear edge of the reinforcing plate is used as the transverse part of the rear U-shaped connecting part 7, two mutually parallel and oppositely arranged vertical parts of the front U-shaped connecting part 7 are respectively formed by extending forward from the upper side and the lower side of the front edge of the reinforcing plate 6, and two mutually parallel and oppositely arranged vertical parts of the rear U-shaped connecting part 7 are respectively formed by extending backward from the upper side and the lower side of the rear edge of the reinforcing plate 6. At this time, the lateral part of the U-shaped connecting part 7 is not required to be arranged alone, and the connecting edges are only required to be arranged on the upper side and the lower side of the front end and the rear end of the reinforcing plate 6, so that the structure is simplified.

On the basis, as shown in fig. 6 and 9, the upper and lower sides of the U-shaped connecting portion 7 of the first reinforcement 4 are overlapped with the corresponding sides of the inner plate 21 and the outer plate 22 and then are connected by three-layer spot welding, the upper side of the first reinforcement 4 is overlapped with the upper sides of the inner plate 21 and the outer plate 22 to form a three-layer mutually-attached structure, and then the first reinforcement 4, the inner plate 21 and the outer plate 22 are welded by the three-layer spot welding; the first reinforcement 4 is accommodated inside the inner panel 21, the upper edge of the first reinforcement 4 is fitted to the inner side of the upper edge of the inner panel 21, the inner panel 21 is fitted to the opening of the outer panel 22, and the upper edge of the inner panel 21 is fitted to the opening of the upper edge of the outer panel 22 with its side away from the opening end thereof, so that the upper edge of the first reinforcement 4, the upper edge of the inner panel 21, and the upper edge of the outer panel 22 are fitted in this order from the inside to the outside, and then welding is performed. Similarly, the lower edge of the first reinforcement 4, the lower edge of the inner panel 21, and the lower edge of the outer panel 22 overlap in this order from the inside to the outside, and are then joined by three-layer spot welding. Since the first reinforcement 4 is spot-welded with the inner plate 21 and the outer plate 22 in three layers, the inner plate 21 and the outer plate 22 can be reinforced at the same time, and the first reinforcement 4 can be positioned and supported at the same time by the inner plate 21 and the outer plate 22, so that the stability and reliability of the first reinforcement 4 are improved.

The second reinforcement 5 may be joined by two spot welding after the upper and lower sides of the U-shaped joint 7 are overlapped with the corresponding sides of the outer panel 22. The upper edge of the second reinforcement 5 is overlapped with the upper edge of the outer plate 22 and then connected by two-layer spot welding, and the lower edge is overlapped with the lower edge of the outer plate 22 and then connected by two-layer spot welding.

As shown in fig. 8, at the positions where the first reinforcement 4 and the second reinforcement 5 are not provided in the middle of the inner panel 21 and the outer panel 22, the inner panel 21 is accommodated in the opening of the U-shape of the outer panel 22, the inner panel 21 is overlapped and attached with the outer end of the upper side thereof to the opening end of the upper side of the outer panel 22 (the inner end corresponding to the outer panel 22), and then is connected by two-layer spot welding; the inner panel 21 is overlapped with the lower edge of the outer panel 22 at the lower edge thereof at the opening end (corresponding to the inner end of the outer panel 22) and then joined by two-layer spot welding.

In addition, as shown in fig. 5, the front and rear ends of the reinforcing plate 6 may be further provided with connection lugs 8, the connection lugs 8 extend in the front and rear direction, specifically, the connection lugs 8 at the front end of the reinforcing plate 6 extend forward, the connection lugs 8 at the rear end extend backward, the number of the connection lugs 8 may be set as required by a person skilled in the art, for example, two connection lugs 8 may be set at the front end of the reinforcing plate 6, and two connection lugs 8 may be set at the rear end.

The first reinforcement 4 is overlapped with the inner lateral surface of the lateral portion of the U-shaped inner panel 21 by the connection lugs 8 thereof, and then is connected by two-layer spot welding, and the second reinforcement 5 is overlapped with the inner lateral surface of the lateral portion of the U-shaped outer panel 22 by the connection lugs 8 thereof, and then is connected by two-layer spot welding, as shown in fig. 4 and 5.

In addition, the reinforcing plate 6 may be provided with a through hole 61 for passing a connecting wire required in the battery case body, or may be provided with a tool such as a wrench for installation.

As shown in fig. 10, the rear end beam 3 may specifically include a rear end plate and connection plates at both left and right sides of the rear end plate, wherein the connection plates at the left side extend from front to rear to right and are connected at their rear ends to the left side of the rear end plate, and the connection plates at the right side extend from front to rear to left and are connected at their rear ends to the right side of the rear end plate, as shown in fig. 2. The rear end beam 3 is welded to the side member 2 on the same side by connecting plates on the left and right sides thereof, and may be welded to a side reinforcement 9 connected to the rear end of the side member 2.

It will be appreciated by those skilled in the art that a housing mount 13 may be provided at both the side sill 2 and the rear end sill 3 for effecting connection of the battery pack housing to the body side member, and that the housing mount 13 may be provided specifically as an inverted L-shaped bracket and then welded with the side sill 2 or the rear end sill 3 at the vertical portion of the L-shaped bracket, the lateral portion of the L-shaped bracket being connected to the body side member as shown in fig. 4, 5 and 10.

Furthermore, the battery pack housing of the present invention further comprises a module mounting plate 11 welded to the inner side surface of the lower housing 1, and a housing reinforcing plate 12 welded to the outer side surface of the lower housing 1, wherein the module mounting plate 11 is used for mounting the module of the battery pack, and the housing reinforcing plate 12 reinforces the housing.

As shown in fig. 11, in one of the sections of the lower housing 1, the module mounting plate 11 is welded on the inner side of the lower housing 1, and the housing reinforcing plate 12 is welded on the outer side of the lower housing 1, at this time, the housing reinforcing plate 12, the lower housing 1 and the module mounting plate 11 are sequentially overlapped from outside to inside, and then three-layer spot welding connection is adopted, so that a three-layer spot welding structure is formed, as shown in fig. 11, at one connection point at the inner end of the bottom surface of the lower housing 1.

The outer side of the lower shell 1 is welded with the shell reinforcing plate 12 and the side beam 2 in sequence at the outer ends of the side surface and the bottom surface of the lower shell 1, specifically, the inner plate 21 of the side beam 2 is overlapped with the shell reinforcing plate 12, at this time, the inner plate 21 of the side beam 2, the shell reinforcing plate 12 and the lower shell 1 are overlapped from outside to inside in sequence, and then three-layer spot welding is adopted to connect, so as to form a three-layer spot welding structure, as shown in a connecting point at the outer end of the bottom surface of the lower shell 1 and two connecting points at the top end and the middle part of the side surface of the lower shell 1 in fig. 11.

By adopting the structural form, the module mounting plate 11 and the side beam 2 are in welded connection, so that the load applied to the mounting plate can be effectively transferred to the side beam body, and the load is finally transferred to the longitudinal beam of the vehicle body through the side beam body, so that the acting force applied to the module mounting plate 11 and the lower shell 1 is reduced, the whole battery pack shell is not easy to deform, and the whole strength of the battery pack shell is greatly improved.

As shown in fig. 12, one connecting point at the side top end of the lower case 1 may be in the form of a three-layer spot-welded structure, i.e., the inner panel 21 of the side member 2, the case reinforcing plate 12 and the lower case 1 are overlapped in this order from the outside to the inside, and then are connected by three-layer spot welding; one connecting point positioned in the middle of the side surface of the lower shell 1 can be connected by adopting two layers of spot welding, namely, the module mounting plate 11 is welded after being overlapped with the side surface of the lower shell 1; the lower shell 1 and the module mounting plate 11 are sequentially overlapped from outside to inside and then are connected by three layers of spot welding; of the two connection points at the inner end of the bottom surface of the lower casing 1, one connection point at the outer side can be formed by two-layer spot welding connection between the lower casing 1 and the casing reinforcing plate 12, and the other connection point at the inner side is formed by two-layer spot welding connection between the module mounting plate 11 and the lower casing 1.

As shown in fig. 13, in one of the cross sections of the rear end beam 3, the lower housing 1 and the module mounting board 11 are overlapped in order from the outside to the inside, and then three-layer spot welding is used for connection. Specifically, a connection point at the top end of the side surface of the lower housing 1 and a connection point at the outer end of the bottom surface of the lower housing 1 are connected by adopting the three-layer spot welding mode, and both the lower end of the side surface of the lower housing 1 and the inner end of the bottom surface of the lower housing 1 can be connected with the module mounting plate 11 by adopting two-layer spot welding.

Experiments prove that when the boundary beam body is added, the main frequency of the battery pack shell reaches 50HZ, and the battery pack shell vibrates for 12 hours and can pass the vibration experiments; meanwhile, after the structure of the side beam body is added, the side collision simulation result of the whole vehicle is obviously improved, the side surface of the battery pack shell is free from deformation, and the intrusion amount is zero.

It should be noted that, in order to facilitate description of the connection mode of the components, the positions of the welding spots are marked by circles in fig. 7-13 for reference of those skilled in the art.

The invention also provides an electric automobile, which comprises the battery pack shell. In view of the fact that the electric vehicle includes many components, the structure of each component is complex, only the battery pack case is described herein, and other parts refer to the prior art, and are not described herein again.

The electric automobile and the battery shell body provided by the invention are described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the core concepts of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims (9)

1. The battery pack shell of the electric automobile comprises a lower shell (1) with a containing cavity for containing a battery pack, and is characterized by further comprising side beams (2) arranged on the left side and the right side of the lower shell (1) and a rear end beam (3) arranged at the rear end of the lower shell (1); the left side and the right side of the rear end beam (3) are respectively connected with the rear ends of the side beams (2) on the same side so as to be connected with each other to form a side beam body around the periphery of the lower shell (1);

The battery pack shell further comprises a module mounting plate (11) welded on the inner side surface of the lower shell (1), and a shell reinforcing plate (12) welded on the outer side surface of the lower shell (1), wherein the shell reinforcing plate (12), the lower shell (1) and the module mounting plate (11) are sequentially overlapped from outside to inside, and the shell reinforcing plate (12) and the side beams (2) are sequentially welded on the outer side of the lower shell (1);

the side beam (2) comprises an inner plate (21) and an outer plate (22) which are welded with each other, and the inner plate (21), the shell reinforcing plate (12) and the lower shell (1) are sequentially overlapped from outside to inside.

2. The battery pack case according to claim 1, further comprising a first reinforcement (4) attached to an inner side surface of the inner panel (21), and a second reinforcement (5) attached to an inner side surface of the outer panel (22), the first reinforcement (4) and the second reinforcement (5) each being disposed at a position corresponding to an impact point of a side collision.

3. The battery pack case according to claim 2, wherein the inner plate (21) and the outer plate (22) are each in a laterally open U-shape, the inner plate (21) accommodates the first reinforcement (4) in the opening of the U-shape thereof, the outer plate (22) accommodates the second reinforcement (5) in the opening of the U-shape thereof, and the inner plate (21) is mounted at the opening of the U-shape of the outer plate (22).

4. A battery pack case according to claim 3, wherein end plates (23) are blocked at the ports of the front and rear ends of the inner plate (21) and the outer plate (22).

5. The battery pack case according to claim 4, wherein the end plate (23) includes a blocking baffle (231) and flanges (232) connected to both upper and lower sides of the baffle (231), the inner plate (21) and the outer plate (22) are joined by three-layer spot welding after being overlapped with the flanges (232) on the upper side by respective upper sides, and are joined by three-layer spot welding after being overlapped with the flanges (232) on the lower side by respective lower sides.

6. The battery pack case according to claim 5, wherein the first reinforcement member (4) and/or the second reinforcement member (5) are/is a reinforcement plate (6), the front and rear ends of the reinforcement plate (6) are provided with U-shaped connecting portions (7) open in the front and rear directions, the upper and lower sides of the U-shaped connecting portions (7) of the first reinforcement member (4) are connected with the corresponding sides of the inner plate (21) and the outer plate (22) by three-layer spot welding, and the upper and lower sides of the U-shaped connecting portions (7) of the second reinforcement member (5) are connected with the corresponding sides of the outer plate (22) by two-layer spot welding.

7. The battery pack case according to claim 6, wherein the reinforcing plate (6) has connecting lugs (8) extending in the front-rear direction at both front and rear ends, and the connecting lugs (8) are lap welded to the inner side surfaces of the inner plate (21) or the lateral portion of the outer plate (22).

8. The battery pack case according to claim 6, wherein the reinforcing plate (6) is provided with a via hole (61).

9. An electric vehicle comprising a battery pack housing according to any one of claims 1 to 8.