CN113540673A

CN113540673A - Battery box, battery package and vehicle

Info

Publication number: CN113540673A
Application number: CN202110800450.9A
Authority: CN
Inventors: 李磊; 李军林
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2021-07-15
Filing date: 2021-07-15
Publication date: 2021-10-22

Abstract

The invention relates to the field of new energy vehicles, and provides a battery box body, a battery pack and a vehicle. The battery box body comprises a lower box body and a structural reinforcement, the structural reinforcement comprises a first beam body and a second beam body, the first beam body and the second beam body are arranged in a crossed mode, the first beam body is connected with the lower box body, a flanging is arranged on the first beam body, the flanging is connected with the lower box body, and/or the second beam body is connected with the lower box body, a flanging is arranged on the second beam body, and the flanging is connected with the lower box body. The contact area between the structural reinforcement and the lower box body is increased by the arrangement of the flanging of the battery box body, so that the connection strength between the structural reinforcement and the lower box body is improved.

Description

Battery box, battery package and vehicle

Technical Field

The invention belongs to the technical field of new energy vehicles, and particularly relates to a battery box body, a battery pack and a vehicle.

Background

At present, install the battery package in new energy vehicle, the battery package includes battery box and battery module, and the battery box includes box and lower box, goes up and installs the stiffening beam in between box and the lower box, and the stiffening beam is partly played the effect of increasing the joint strength between box and the lower box, and on the other hand plays the effect of separating battery box inner space to cut apart into a plurality of holding chambeies with battery box is inside, the battery module is installed in the holding chamber.

In the prior art, the stiffening beam is directly connected with the lower box body, and the connection strength is relatively weak.

Disclosure of Invention

The embodiment of the invention aims to provide a battery box body, which aims to solve the technical problem that the structural connection strength of the existing battery box body is relatively weak.

In order to achieve the purpose, the invention adopts the technical scheme that: a battery case, comprising: the structure comprises a lower box body and a structure reinforcing piece, wherein the structure reinforcing piece comprises a first beam body and a second beam body, and the first beam body and the second beam body are arranged in a crossed mode;

the first beam body is connected with the lower box body, a flanging is arranged on the first beam body, the flanging is connected with the lower box body, and/or

The second beam body is connected with the lower box body, a flanging is arranged on the second beam body, and the flanging is connected with the lower box body.

By adopting the scheme, the contact area between the structural reinforcement and the lower box body is increased by the arrangement of the turned-over edge, so that the connection strength between the structural reinforcement and the lower box body is improved.

In one embodiment, the cuff includes a first carbon fiber skin and a first foam core, the first carbon fiber skin being wrapped around the exterior of the first foam core.

By adopting the scheme, the structural strength of the flanging is relatively high, and the weight is relatively light.

In one embodiment, the first carbon fiber skin has a wall thickness in a range of 0.8mm to 1.2mm and the first foam core has a thickness in a range of 3.0mm to 5.0 mm.

By adopting the scheme, the integral structural strength of the flanging can be ensured within the thickness range.

In one embodiment, the lower box body comprises a bottom plate and a frame, the frame surrounds the periphery of the side face of the bottom plate, and the thickness of the frame is larger than that of the bottom plate; the bottom plate is made of carbon fiber materials, the frame comprises a second carbon fiber skin and a second foam core body, and the second carbon fiber skin is wrapped outside the second foam core body.

Through adopting above-mentioned scheme, the frame can play the effect that improves box structural strength down, and because the thickness of frame is greater than the thickness of bottom plate, consequently the frame also can play the limiting displacement to the structure of installation on the bottom plate. Because the bottom plate is made of the carbon fiber material, and the frame comprises the second carbon fiber skin and the second foam core body, the structural strength of the lower box body is improved, and the weight of the lower box body is relatively light.

In one embodiment, the base plate has a thickness of 5.5mm to 6.5mm, the second carbon fiber skin has a thickness of 2.0mm to 3.0mm, and the second foam core has a thickness of 12.0mm to 15.0 mm.

By adopting the scheme, the bottom plate is relatively thinner, so that the total weight of the lower box body is lighter, and the thickness of the frame is thicker, so that the lower box body and the whole vehicle can be conveniently installed.

In one embodiment, the frame is provided with a metal bushing, one end of the metal bushing protrudes out of the top surface of the frame, and/or the outer side surface of the metal bushing is provided with a glue film.

Through adopting above-mentioned scheme, metal bush's rigidity is bigger relatively, is favorable to being connected frame and whole car installation position rigid connection, improves joint strength. The metal lining protruding out of the frame is beneficial to being in rigid contact with the whole vehicle mounting position. Because the expansion coefficients of the metal lining and the frame are different, size change deviation occurs during expansion, and the glue film can compensate the size deviation between the metal lining and the frame.

In one embodiment, the structural reinforcement further includes two edge beams, the height of each edge beam is greater than that of the corresponding second beam body, the number of the first beam bodies is multiple, the first beam bodies are arranged at intervals, one end of each first beam body is connected with one edge beam, the other end of each first beam body is connected with another edge beam, and at least one edge beam is provided with the flange.

Through adopting above-mentioned scheme, the boundary beam plays supporting role between box and last box down, and first roof beam body and second roof beam body play the effect of separate space in the box down, because the height of the second roof beam body is less than the height of boundary beam, therefore the weight of structural reinforcement is lighter relatively. The connecting area between the boundary beam connected with the flanging and the lower box body can be increased, so that the connecting strength between the boundary beam and the lower box body is improved.

In one embodiment, the battery box body further comprises a liquid cooling plate, the liquid cooling plate is connected to the lower box body, the liquid cooling plate is provided with an avoiding hole, the avoiding hole is opposite to the flanging, and the flanging penetrates through the avoiding hole and is connected with the lower box body.

Through adopting above-mentioned scheme, the liquid cooling board is direct to be connected with lower box, and the turn-ups of structural reinforcement passes behind the hole of dodging of liquid cooling board and is connected with lower box, also the increase of liquid cooling board does not influence the gross thickness of battery box.

The embodiment of the invention also aims to provide a battery pack, which comprises a battery module and the battery box body provided by the technical scheme, wherein the battery module is arranged in the battery box body.

Through adopting above-mentioned scheme, the structural connection intensity in the battery box of battery package is stronger.

An object of the embodiment of the present invention is also to provide a vehicle including the battery pack provided in the above technical solution.

Through adopting above-mentioned scheme, the structural connection intensity in the battery box of the battery package in the vehicle is stronger.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic perspective view of a battery case according to an embodiment of the present invention;

FIG. 2 is a top view of a battery case according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of a structural reinforcement member in a battery case according to an embodiment of the present invention;

FIG. 4 is an enlarged view of a portion of FIG. 3 at A;

FIG. 5 is a top view of a structural reinforcement member in a battery case provided in an embodiment of the present invention;

FIG. 6 is a top view of a lower housing of the battery housing provided in an embodiment of the present invention;

FIG. 7 is a cross-sectional view taken at B-B of FIG. 6;

FIG. 8 is an enlarged view of a portion of FIG. 7 at C;

fig. 9 is a schematic perspective view of a liquid cooling plate in a battery case according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

100-lower box body; 110-a base plate; 120-a border; 121-a second carbon fiber skin; 122-a second foam core; 130-a metal bushing; 140-mounting a nut; 200-structural reinforcement; 210-a first beam; 220-a second beam; 230-flanging; 240-mounting a boss; 250-module mounting holes; 260-edge beam; 261-a transition connection plate; 300-liquid cooling plate; 310-avoidance holes; 400-a first card connector; 500-second card connector.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The following describes a specific implementation of the present invention in more detail with reference to specific embodiments:

referring to fig. 1, fig. 2 and fig. 3, an embodiment of the present invention provides a battery case, including: lower box 100 and structural reinforcement 200, structural reinforcement 200 includes first roof beam body 210 and second roof beam body 220, first roof beam body 210 and second roof beam body 220 cross arrangement, first roof beam body 210 is connected with lower box 100, first roof beam body 210 is provided with turn-ups 230, turn-ups 230 is connected with lower box 100, and/or second roof beam body 220 is connected with lower box 100, second roof beam body 220 is provided with turn-ups 230, turn-ups 230 is connected with lower box 100.

Specifically, in one case, only the first beam 210 is connected to the lower box 100 among the first beam 210 and the second beam 220, and the second beam 220 is connected to the first beam 210, a flange 230 is disposed at the bottom of the first beam 210, and the flange 230 is connected to the lower box 100, so that the contact area between the first beam 210 and the lower box 100 is increased, and the connection stability is improved.

In another case, only the second beam 220 of the first beam 210 and the second beam 220 is connected to the lower box 100, and the first beam 210 is connected to the first beam 210, so that the flange 230 is disposed at the bottom of the second beam 220, and the flange 230 is connected to the lower box 100, thereby increasing the contact area between the second beam 220 and the lower box 100 and improving the connection stability.

In another case, the first beam 210 and the second beam 220 are both connected to the lower box 100, and flanges 230 are provided at the bottom of the first beam 210 and the bottom of the second beam 220, and the flanges 230 are connected to the lower box 100, so that the contact area between the first beam 210 and the lower box 100 is increased by the flanges 230, the contact area between the second beam 220 and the lower box 100 is increased, and the connection stability is improved.

In summary, by adopting the above scheme, the contact area between the structural reinforcement member 200 and the lower case 100 is increased by the arrangement of the turned-up edge 230, so that the connection strength between the structural reinforcement member 200 and the lower case 100 is improved.

In this embodiment, the battery box further includes an upper box (not shown), the upper box is buckled on the lower box 100, the upper box is connected to the lower box 100, and the structural reinforcement 200 is respectively connected to the upper box and the lower box 100 to support the upper box and the lower box 100, so as to improve the structural stability of the battery box.

In a preferred embodiment of this embodiment, the structural reinforcement 200 is glued to the lower case 100, and the flange 230 increases the gluing area, thereby improving the connection reliability at the joint between the structural reinforcement 200 and the lower case 100.

In the structural reinforcing member 200, the number of the first beam 210 is at least one, and the number of the second beam 220 is at least one.

As shown in fig. 2 and 3, the number of the first beam bodies 210 is multiple (5 first beam bodies 210 in fig. 3), the number of the second beam bodies 220 is one, the length directions of the plurality of first beam bodies 210 are parallel to each other and are arranged at equal intervals, the length direction of the second beam bodies 220 is perpendicular to the length direction of the first beam bodies 210, and the second beam bodies 220 sequentially penetrate through the first beam bodies 210 and are connected to the first beam bodies 210.

In a preferred embodiment, the structural reinforcement 200 further includes two edge beams 260, the height of the edge beam 260 is greater than that of the second beam 220, the number of the first beams 210 is multiple, the first beams 210 are spaced apart, one end of each first beam 210 is connected to one edge beam 260, and the other end of each first beam 210 is connected to another edge beam 260. The lengthwise direction of the edge beam 260 is parallel to the lengthwise direction of the second beam body 220. With this arrangement, the side beams 260, the first beam 210 and the second beam 220 divide the lower case 100 into a plurality of receiving cavities for mounting a plurality of battery modules.

Specifically, the two edge beams 260 have the same height, the first beam bodies 210 have the same height, and the second beam bodies 220 have the same height. Preferably, the height of the first beam 210 is equal to the height of the second beam 220.

By adopting the above scheme, the bottom of the edge beam 260 is connected with the lower box body 100, the top of the edge beam 260 is used for being connected with the upper box body of the battery box body, the edge beam 260 plays a supporting role between the lower box body 100 and the upper box body, the first beam body 210 and the second beam body 220 play a role in separating space in the lower box body 100, and the weight of the structural reinforcement 200 is relatively lighter because the height of the second beam body 220 is smaller than that of the edge beam 260.

In a preferred embodiment of the present embodiment, the edge beam 260, the first beam body 210, and the second beam body 220 are made of a carbon fiber material. So configured, the weight of the structural reinforcement 200 can be reduced while maintaining the structural strength requirements of the structural reinforcement 200.

In one embodiment, the first beam 210, the second beam 220, and the edge beam 260 are connected as a unitary structure.

Specifically, when the edge beam 260, the first beam body 210, and the second beam body 220 are all made of carbon fiber material, and the flange 230 includes a first carbon fiber skin and a first foam core, the edge beam 260, the first beam body 210, the second beam body 220, and the flange 230 may be made as a unitary structure by a carbon fiber lay-up process.

As shown in fig. 3, in one embodiment, the height of the edge beam 260 is greater than the height of the first beam 210, a transition connection plate 261 is disposed between the end of the edge beam 260 and the first beam 210, and the height of the transition connection plate 261 is gradually reduced from the side connected with the edge beam 260 to the side connected with the first beam 210.

By adopting the above scheme, the transition connecting plate 261 improves the connection strength between the edge beam 260 and the first beam body 210.

As shown in fig. 3, the connection between the end of the edge beam 260 and the corresponding first beam 210 has a rounded corner, or the transition connection plate 261 is an arc-shaped plate, so that an arc-shaped transition is formed between the end of the edge beam 260 and the corresponding first beam 210.

As shown in fig. 2 and 5, a flange 230 may be provided at a side of the side sill 260 connected to the lower case 100, and the flange 230 is used to improve the connection strength between the side sill 260 and the lower case 100.

Because the number of the side beams 260 is two, the flanges 230 may be provided on only one of the side beams 260, or the flanges 230 may be provided on both the two side beams 260, specifically according to the inside space layout of the lower box 100.

As shown in fig. 2, since there is a space between one of the side members 260 (the side member 260 on the left side in the drawing) and the side frame 120 of the lower box 100 in fig. 2, the flange 230 is connected to the side member 260, and the space between the other side member 260 (the side member 260 on the right side in the drawing) and the side frame 120 is small, and it is difficult to accommodate the flange 230, and therefore, the flange 230 is not installed at the side member 260.

Specifically, the length of the flange 230 may be equal to the length of the sill 260, or the length of the flange 230 may be less than the length of the sill 260. As shown in fig. 2, two flanges 230 are installed at the bottom of one of the side beams 260, and the length of each of the two flanges 230 is smaller than that of the side beam 260.

Similarly, when the flanges 230 are disposed on the first beam 210 or the second beam 220, the length of the flanges 230 may be equal to the length of the corresponding first beam 210 or the corresponding second beam 220, or may be smaller than the length of the corresponding first beam 210 or the corresponding second beam 220. In fig. 2, a flange 230 is provided at the bottom of the first beam 210, and the length of the flange 230 is smaller than that of the first beam 210.

One first beam 210 may be correspondingly provided with one or more flanges 230, for example, in fig. 2, some first beams 210 are correspondingly provided with one flange 230, and some beams are provided with three flanges 230 at intervals along the length direction.

When a plurality of flanges 230 are disposed on one first beam 210, the lengths of the flanges 230 may be the same or different.

As shown in fig. 4, in one embodiment, the flanges 230 are provided with mounting bosses 240, and the mounting bosses 240 are used for coupling with the battery module.

Through adopting above-mentioned scheme, installation boss 240 provides the installation space for battery module's connection, and battery module is connected with installation boss 240, and also battery module passes through structural reinforcement 200 and is connected with lower box 100, and battery module's weight more evenly transmits to lower box 100 via the turn-ups 230 of structural reinforcement 200.

In fig. 4, a module mounting hole 250 is longitudinally formed in the mounting boss 240, and the module mounting hole 250 may be a through hole or a threaded hole. When the module mounting hole 250 is a threaded hole, a threaded sleeve may be pre-embedded at the mounting boss 240 to form the module mounting hole 250 with an internal thread. Since the mounting boss 240 is provided on the burring 230, the total thickness of the mounting boss 240 and the burring 230 is made greater than the thickness of the burring 230, which makes it possible to provide the module mounting hole 250 having a greater hole depth to improve the connection stability of the mounting boss 240 and the battery module. Because the battery module can be installed in installation boss 240 department, compare with directly with battery module fixed to lower box 100, the gravity of battery module can be for even transmission to lower box 100 via installation boss 240 and turn-ups 230, avoids battery module and lower box 100's junction to appear stress concentration phenomenon.

As shown in fig. 1 and 6, in one embodiment, the lower case 100 includes a bottom plate 110 and a rim 120, the rim 120 surrounds a circumference of a side of the bottom plate 110, and a thickness of the rim 120 is greater than a thickness of the bottom plate 110.

The structural reinforcement 200 is mounted on the base plate 110 and is located inside an area surrounded by the rim 120.

The flange 230 and the bottom plate 110 may be connected by structural adhesive. The side of the flange 230 having the largest area is parallel to the side of the base plate 110 having the largest area.

Through adopting above-mentioned scheme, frame 120 can play the effect that improves box 100 structural strength down, and because the thickness of frame 120 is greater than the thickness of bottom plate 110, therefore frame 120 also can play the limiting displacement to the structure of installing on bottom plate 110.

In addition, since the thickness of the frame 120 is relatively larger, when the lower case 100 is connected to the upper case or the entire vehicle, the frame 120 provides a larger installation space, so that the connection stability between the lower case 100 and the upper case or other structures of the entire vehicle can be improved.

In a preferred embodiment, shown in fig. 7 and 8, the base plate 110 is made of a carbon fiber material, and the bezel 120 includes a second carbon fiber skin 121 and a second foam core 122, the second carbon fiber skin 121 being wrapped around the outside of the second foam core 122.

By adopting the above scheme, the structural strength of the lower box body 100 is improved, and the weight of the lower box body 100 is relatively light.

The carbon fiber material is adopted to replace metal materials such as aluminum alloy and the like, so that the weight reduction effect can be achieved, and the weight reduction can be realized by 30% -50% under the same volume state. And the strength of the carbon fiber material is relatively higher, and the lower box body 100 can meet the requirements of mechanical strength such as random vibration, mechanical impact, simulated collision, bottom ball impact and the like under the condition of realizing the weight reduction effect.

The frame 120 includes a second carbon fiber skin 121 and a second foam core 122, where the second carbon fiber skin 121 is made of a carbon fiber material, and the second foam core 122 is made of a foam material, such as Polymethacrylimide (PMI) foam. The second foam core 122 is located inside the second carbon fiber skin 121, and plays a role in supporting and further reducing weight, so that the frame 120 with a relatively thicker thickness can achieve a further weight reduction effect. PMI foam has high strength, light weight characteristics.

In one embodiment, the thickness of the base plate 110 is 5.5mm to 6.5mm, and may be, for example, 5.5mm, 5.8mm, 6.0mm, 6.1mm, 6.2mm, or 6.5 mm.

The thickness of the second carbon fiber skin 121 is 2mm to 3mm, and may be, for example, 2.0mm, 2.1mm, 2.2mm, 2.4mm, 2.5mm, 2.8mm, or 3.0 mm.

The thickness of the second foam core 122 is 12.0mm to 15.0mm, and may be, for example, 12.0mm, 12.1mm, 12.8mm, 13.0mm, 14.0mm, 14.5mm, or 15.0 mm.

For example, the thickness of the bottom plate 110 is 6mm, the thickness of the second carbon fiber skin 121 is 2.5mm, the thickness of the second foam core 122 is 14mm, and the total thickness of the frame 120 is 19mm because the second carbon fiber skin 121 is respectively arranged at the upper side and the lower side of the second foam core 122.

Through adopting above-mentioned scheme, owing to adopt carbon fiber material preparation bottom plate 110, consequently can make bottom plate 110 thinner relatively under the condition of guaranteeing structural strength, consequently make down box 100 total weight lighter, because frame 120 thickness is thicker, consequently be convenient for down box 100 and whole car install.

In one embodiment, cuff 230 includes a first carbon fiber skin and a first foam core, with the first carbon fiber skin wrapped around the exterior of the first foam core. The first carbon fiber skin and the first foam core in the cuff 230 are arranged in a similar manner to the second carbon fiber skin 121 and the second foam core 122 in the frame 120, but have different structural dimensions.

By adopting the above scheme, the structural strength of the flange 230 can be relatively high and the weight can be relatively light.

In one embodiment, the first carbon fiber skin has a wall thickness in the range of 0.8mm to 1.2mm, and may be, for example, 0.8mm, 0.9mm, 1.0mm, 1.1mm, or 1.2mm thick.

The first foam core has a thickness in the range of 3.0mm to 5.0 mm. For example, the thickness may be 3.0mm, 3.5mm, 4.0mm, 4.5mm, 4.8mm, or 5.0 mm.

By adopting the above scheme, the overall structural strength of the flange 230 can be ensured within the above thickness range.

For example, if the first carbon fiber skin has a wall thickness of 1mm and the first foam core has a thickness of 4mm, the overall thickness of the cuff 230 is 6 mm.

As shown in fig. 7 and 8, in one embodiment, the bezel 120 is provided with a metal bushing 130.

Because the rigidity of the metal bushing 130 is relatively higher, the frame 120 and the whole vehicle can be rigidly connected, and the connection strength is improved.

Specifically, a plurality of metal bushings 130 are provided at intervals on the bezel 120.

The metal bushing 130 can be made of aluminum alloy, such as aluminum alloy 6061. Compared with the method of directly punching the frame 120 to serve as a whole vehicle mounting hole, the metal bushing 130 can improve the structural strength of the hole wall of the whole vehicle mounting hole and improve the connection stability.

In one embodiment, one end of the metal bushing 130 protrudes from the top surface of the bezel 120, and the length of the structure in which the metal bushing 130 protrudes from the top surface of the bezel 120 ranges from 1.8mm to 2.3 mm. For example, the length may be 1.8mm, 1.9mm, 2.0mm, 2.1mm, 2.2mm, or 2.3 mm. The total length of the metal bushing 130 is the sum of the thickness of the bezel 120 and the length of the metal bushing 130 that protrudes outside the bezel 120.

Preferably, the top end of the metal bushing 130 protrudes above the top surface of the bezel 120, and the length of the structure protruding the top surface of the bezel 120 is 2.0 mm. If the thickness of the frame 120 is 19.0mm, the total length of the metal bushing 130 is 21.0 mm.

In one embodiment, the metal bushing 130 has an inner diameter of 12.0mm and an outer diameter of 16.0 mm.

By adopting the scheme, the bush protruding out of the frame 120 is beneficial to being in rigid contact with the whole vehicle installation position, so that the connection strength between the lower box body 100 and the whole vehicle installation position is improved.

When the lower box body 100 is installed in a vehicle, the lower box body 100 is connected with a corresponding whole vehicle installation position, specifically, a bolt is adopted for connection, and the bolt penetrates through the metal bushing 130 and then is connected with the whole vehicle installation position.

The metal bushing 130 is mounted to the frame 120 by first manufacturing the frame 120, then punching a hole in the manufactured frame 120, and then mounting and fixing the metal bushing 130 in the hole to fixedly connect the metal bushing 130 to the frame 120.

Or, preferably, the metal bushing 130 is integrally formed with the frame 120, and when the carbon fiber layering operation of the frame 120 is performed, the metal bushing 130 is pre-embedded in the frame 120, so that the metal bushing 130 and the frame 120 form an integral structure.

Further, in order to avoid the thermal expansion coefficient of the metal bushing 130 being different from that of the second carbon fiber skin 121 of the frame 120, an adhesive film is wrapped on the outer side surface of the metal bushing 130. Due to the provision of the glue film, the glue film is between the metal bushing 130 and the second carbon fiber skin 121 to compensate for dimensional deviations occurring during the expansion process.

As shown in fig. 7, a mounting nut 140 may be further provided in the rim 120, and the mounting nut 140 is used for connection with the upper case.

The mounting nut 140 is coupled to the bezel 120 in a similar manner as described above with respect to the coupling between the metal bushing 130 and the bezel 120.

In one embodiment, the rim 120 may be manufactured, and then a groove may be punched or cut into the rim 120, and one end of the mounting nut 140 may be inserted into the groove, and the mounting nut 140 may be coupled to an inner wall of the groove. An outward extending part extending outwards (extending towards the direction away from the axis of the mounting nut) can be arranged at the top of the mounting nut 140, one end of the mounting nut 140 extends into the groove, and after the bottom of the mounting nut 140 is contacted with the bottom of the groove, the outward extending part is contacted with the top surface of the frame 120, and the outward extending part is fixedly connected with the top surface of the frame 120 so as to fix the mounting nut 140 with the frame.

Or, in another specific embodiment, the mounting nut 140 is integrally formed with the frame 120, and when the carbon fiber laying operation of the frame 120 is performed, the mounting nut 140 is pre-embedded in the frame 120, so that the mounting nut 140 and the frame 120 form an integral structure.

As shown in fig. 1 and 9, in one embodiment, the battery box further includes a liquid cooling plate 300, the liquid cooling plate 300 is connected to the lower box 100, the liquid cooling plate 300 is provided with an avoiding hole 310, the avoiding hole 310 is disposed opposite to the flange 230, and the flange 230 passes through the avoiding hole 310 and is connected to the lower box 100.

By adopting the above scheme, the liquid cooling plate 300 is directly connected with the lower case 100, and the flange 230 of the structural reinforcement member 200 passes through the avoiding hole 310 of the liquid cooling plate 300 and then is connected with the lower case 100, i.e. the total thickness of the battery case is not affected by the increase of the liquid cooling plate 300.

When being applied to the battery package with the battery box, the battery module is connected with additional strengthening spare, and the direct and liquid cold plate 300 contact in bottom surface of battery module is convenient for dispel the heat.

As shown in fig. 1 and 9, in one embodiment, the first reinforcing beam is provided with the flange 230, the second reinforcing beam is not provided with the flange 230, the number of the first reinforcing beams is plural, and each of the first reinforcing beams is provided with the flange 230. The liquid cooling plate 300 is provided with avoiding holes 310 corresponding to the flanges 230 of each first reinforcing beam.

In the installation process, the liquid cooling plate 300 is connected with the bottom plate 110, and then the structural reinforcement member 200 is connected with the bottom plate 110, specifically, the flange 230 of the structural reinforcement member 200 is connected with the bottom plate 110 after passing through the avoiding hole 310, since the flange 230 is connected with the bottom plate 110, the first reinforcement beam is connected with the bottom plate 110, and since the second reinforcement beam is connected with the first reinforcement beam, the position of the second reinforcement beam is relatively fixed with the bottom plate 110. The bottom surface of the second reinforcing beam may overlap the top surface of the liquid-cooled panel 300, or there may be a gap between the bottom surface of the second reinforcing beam and the top surface of the liquid-cooled panel 300.

Liquid cooling board 300 can adopt the aluminum alloy material to make, the connection between liquid cooling board 300 and the bottom plate 110 is for splicing, splice specifically for using the structure to glue and connect liquid cooling board 300 and bottom plate 110, the structure is glued and can be adopted the better polyurethane structure of pliability to glue, with glue through the structure and play the effect of buffering between liquid cooling board 300 and bottom plate 110, avoid down box 100 because of extrusion or vibration deformation lead to liquid cooling board 300 to bend too big fracture, the phenomenon of coolant liquid leakage takes place.

In one embodiment, as shown in fig. 1 and 2, the battery case further includes a first card connector 400 and a second card connector 500, and the first card connector 400 and the second card connector 500 are respectively arranged at the front end and the rear end of the bottom plate 110 and are used for connecting a high-voltage card and a low-voltage card with a motor.

The first and

second card connectors

400, 500 may be made of a carbon fiber material. Or, because the structural shape is relatively complex, and the interior has a plurality of threaded holes, it is more complex to adopt carbon fiber integrated into one piece, and it is long consuming time, and in order to improve production efficiency, the first plug-in connector 400 and the second plug-in connector 500 are both made of metal material, for example, aluminum alloy material. The first card connector 400 and the second card connector 500 can be connected to the lower casing 100 by a combination of glue and mechanical connection. The mechanical connection mode can be a mortise and tenon joint mode and the like.

As shown in fig. 1, in one embodiment, a first card connector 400 is installed at the front end of the lower casing 100, and the first card connector 400 is specifically installed on the rim 120 of the lower casing 100, and the first card connector 400 is used for installation of high and low voltage cards. The second card connector 500 is installed at the rear end of the lower case 100, and a partial region of the second card connector 500 is installed on the rim 120 and a partial region is installed on the base plate 110, and the second card connector 500 is used for performing the insertion installation of the motor.

The embodiment of the invention also provides a battery pack which comprises a battery module and the battery box body provided by the embodiment. The battery module is installed in the inside of battery box.

Specifically, when the lower case 100 of the battery case is provided with the liquid cooling plate 300, the bottom surface of the battery module is in contact with the liquid cooling plate 300. When the mounting bosses 240 are provided on the flanges 230 of the reinforcing structure, the battery module is coupled with the mounting bosses 240.

Through the battery box that adopts above-mentioned scheme to provide, battery package structure joint strength is stronger.

Because the battery module is directly contacted with the liquid cooling plate 300, the heat dissipation and heat transfer path of the battery module is relatively shorter, the thermal resistance is small, and the heat dissipation effect of the battery module is better.

Since the liquid cooling plate 300 is directly connected to the bottom plate 110 of the lower case 100, no other support structure is required, so that the internal structure of the entire battery case is more compact, and the Z-direction dimension is optimized, i.e., is relatively smaller. The Z-dimension is a direction perpendicular to the side of the largest area of the base plate 110.

The embodiment of the invention also provides a vehicle which comprises the battery pack provided by the embodiment.

Through the battery package that adopts above-mentioned scheme to provide, the structural connection intensity in the battery box body of the battery package in the vehicle is stronger.

The vehicle provided by the embodiment can be a pure electric vehicle and can also be a hybrid vehicle.

It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, in the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A battery case, comprising: the structure comprises a lower box body and a structure reinforcing piece, wherein the structure reinforcing piece comprises a first beam body and a second beam body, and the first beam body and the second beam body are arranged in a crossed mode; it is characterized in that the preparation method is characterized in that,

2. The battery box of claim 1, wherein the cuff includes a first carbon fiber skin and a first foam core, the first carbon fiber skin being wrapped around an exterior of the first foam core.

3. The battery box of claim 2, wherein the first carbon fiber skin has a wall thickness in a range of 0.8mm to 1.2mm and the first foam core has a thickness in a range of 3.0mm to 5.0 mm.

4. The battery box body of claim 1, wherein the lower box body comprises a bottom plate and a frame, the frame surrounds a circle of the side surface of the bottom plate, and the thickness of the frame is greater than that of the bottom plate; the bottom plate is made of carbon fiber materials, the frame comprises a second carbon fiber skin and a second foam core body, and the second carbon fiber skin is wrapped outside the second foam core body.

5. The battery case according to claim 4, wherein the base plate has a thickness of 5.5mm to 6.5mm, the second carbon fiber skin has a thickness of 2.0mm to 3.0mm, and the second foam core has a thickness of 12.0mm to 15.0 mm.

6. The battery box according to claim 4, wherein the frame is provided with a metal bushing;

one end of the metal lining is protruded out of the top surface of the frame, and/or

And an adhesive film is arranged on the outer side surface of the metal bushing.

7. The battery box body according to any one of claims 1 to 6, wherein the structural reinforcement further comprises two side beams, the height of each side beam is greater than that of the second side beam, the number of the first side beams is multiple, the first side beams are arranged at intervals, one end of each first side beam is connected with one side beam, the other end of each first side beam is connected with another side beam, and at least one side beam is provided with the flanging.

8. The battery box body of any one of claims 1-6, further comprising a liquid cooling plate, wherein the liquid cooling plate is connected to the lower box body, the liquid cooling plate is provided with an avoiding hole, the avoiding hole is opposite to the flange, and the flange passes through the avoiding hole and is connected to the lower box body.

9. A battery pack comprising a battery module and the battery case according to any one of claims 1 to 8, the battery module being mounted inside the battery case.

10. A vehicle characterized by comprising the battery pack according to claim 9.