Battery box and vehicle

Abstract

The invention discloses a battery box and a vehicle, and relates to the technical field of batteries, the battery box comprises a battery tray and a top plate, the battery tray comprises a bottom plate and an edge beam connected with the outer edge of the bottom plate, and the bottom plate comprises a bottom lower plate, a bottom cold plate and a bottom protective plate which are stacked in sequence; a bottom liquid cavity for cooling liquid to flow is formed between the bottom cold plate and the bottom lower plate; the top plate is connected with the ends, away from the bottom plate, of the edge beams and comprises a top cold plate and a top lower plate which are connected, and a top liquid cavity allowing cooling liquid to flow is formed between the top cold plate and the top lower plate. And the top plate and the battery tray define an accommodating cavity for accommodating a battery cell. According to the technical scheme provided by the invention, the volume utilization rate of the battery box body is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a battery box and a vehicle. Background Art

[0002] Side pillar collision of a whole vehicle is a relatively serious collision accident, which can cause various harms to a battery pack. The battery pack is generally installed at the bottom or side of the vehicle body. The squeezing force generated by the collision can cause the shell of the battery pack to be dented, distorted, etc. At the same time, the battery modules and battery cells inside the battery pack may also be damaged, and even cause internal short circuit of the battery. Once a short circuit occurs, it may trigger thermal runaway, and even cause consequences such as fire or explosion.

[0003] The structure of the battery pack generally includes a battery box and battery modules disposed in the battery box. The battery box includes a bottom plate, a top plate, and side beams disposed between the top plate and the bottom plate. Among them, the side beams are the main load-bearing members for withstanding side pillar collision. Currently, in order to prevent the side beams from invading the battery modules after being crushed by force, the safety distance between the battery modules and the side beams is generally increased, resulting in a low volume utilization rate of the battery box. Summary of the Invention

[0004] The main purpose of the embodiments of the present invention is to propose a battery box and a vehicle, aiming to improve the volume utilization rate of the battery box.

[0005] To achieve the above object, the battery box proposed by the embodiments of the present invention includes:

[0006] A battery tray, including a bottom plate and side beams connected to the outer edge of the bottom plate. The bottom plate includes a bottom lower plate, a bottom cold plate, and a bottom protection plate stacked in sequence. A bottom liquid cavity for coolant to flow is formed between the bottom cold plate and the bottom lower plate; and

[0007] A top plate, connected to the end of the side beam away from the bottom plate. The top plate includes a top cold plate and a top lower plate connected to each other. A top liquid cavity for coolant to flow is formed between the top cold plate and the top lower plate; the top plate and the battery tray enclose an accommodation cavity for accommodating battery cells.

[0008] In an embodiment, in the direction from the bottom plate to the top plate, the thickness of the bottom plate is h1, the thickness of the top plate is h2, and 0.4*h1 ≤ h2 ≤ 0.5*h1.

[0009] In an embodiment, the side beam includes a first end connected to the bottom plate and a second end connected to the top plate. In the direction close to the inside of the accommodation cavity, the width of the first end is w1, the width of the second end is w2, and 0.4*w1 ≤ w2 ≤ 0.8*w1.

[0010] In one embodiment, the side beam includes a first section near the first end and a second section near the second end. In the direction from the bottom plate to the top plate, the first section gradually narrows and is connected to the second section, and a first reinforcing rib is formed therebetween; in the direction towards the interior of the accommodation cavity, the first reinforcing rib is inclined upwards.

[0011] In one embodiment, the thickness of the outer sidewall of the first section is d1, and the thickness of the inner sidewall of the first section is d2, where 1 / 3*d1 ≤ d2 < d1.

[0012] In one embodiment, a second reinforcing rib and a third reinforcing rib are spaced apart in the second section, and the third reinforcing rib is located on the side of the second reinforcing rib away from the first reinforcing rib; in the direction towards the interior of the accommodation cavity, the second reinforcing rib is inclined upwards and the third reinforcing rib is inclined downwards.

[0013] In one embodiment, the second section includes a first sub-section and a second sub-section separated by the second reinforcing rib, the second sub-section is located on the side of the first sub-section away from the first section, the thickness of the outer sidewall of the first sub-section is d3, and the thickness of the outer sidewall of the second sub-section is d4, where d3 > d4.

[0014] In one embodiment, the side beam is connected to the bottom plate through a first bolt structure, the first section defines a first cavity, at least part of the first bolt structure is disposed in the first cavity, and the first bolt structure has two rows; and / or

[0015] The side beam is connected to the top plate through a second bolt structure, the second section defines a second cavity, and at least part of the second bolt structure is disposed in the second cavity.

[0016] In one embodiment, the bottom lower plate is configured as a flat plate, the bottom cold plate includes a plurality of spaced-apart bottom convex portions, and a plurality of bottom liquid cavities are formed between the bottom lower plate and the plurality of bottom convex portions;

[0017] The top lower plate is configured as a flat plate, the top cold plate includes a plurality of spaced-apart top convex portions, and a plurality of top liquid cavities are formed between the top lower plate and the plurality of top convex portions.

[0018] The present invention also provides a vehicle, including the battery box body as described above, and the battery box body is installed on the vehicle body.

[0019] In the technical solution of the embodiment of the present invention, a battery tray and a top plate are arranged in a battery box body. The top plate and the battery tray enclose a receiving cavity for receiving battery cells. The battery tray includes a bottom plate and side beams connected to the edge of the bottom plate. The bottom plate includes a bottom cold plate and a bottom lower plate connected to each other. A bottom liquid cavity for the coolant to flow is formed between the bottom cold plate and the bottom lower plate. The top plate is connected to the end of the side beam away from the bottom plate. The top plate includes a top cold plate and a top lower plate connected to each other. A top liquid cavity for the coolant to flow is formed between the top cold plate and the top lower plate. Thus, compared with the prior art in which the top plate is a thin plate, the top plate of the present invention is set to have a cavity structure, thereby increasing the thickness of the top plate and the connection strength between the side beam and the top plate, and avoiding the separation of the side beam and the top plate during a side column collision. At the same time, the cavity structure of the top plate is set as a top liquid cavity for the coolant to flow to cool the battery cells. In this way, both the bottom and the top of the battery cells can be cooled, improving the cooling efficiency of the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0021] Figure 1 FIG. is a schematic structural diagram of an embodiment of a battery box body provided by the present invention.

[0022] Description of the reference numerals in the drawings:

[0023] 100, battery tray; 200, bottom plate; 210, bottom cold plate; 211, bottom convex; 220, bottom lower plate; 230, bottom liquid cavity; 240, bottom guard plate; 300, side beam; 311, first end; 312, second end; 321, first section; 322, second section; 323, first sub-section; 324, second sub-section; 331, first reinforcing rib; 332, second reinforcing rib; 333, third reinforcing rib; 341, first cavity; 342, second cavity; 351, first bolt structure; 352, second bolt structure; 360, suspension part; 400, top plate; 410, top cold plate; 411, top convex; 420, top lower plate; 430, top liquid cavity; 440, top reinforcing plate; 510, battery cell; 520, receiving cavity;

[0024] The realization, functional characteristics and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0026] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0028] The side pillar collision of a whole vehicle is a relatively serious collision accident, which can cause various hazards to the battery pack. The battery pack is generally installed at the bottom or side of the vehicle body. The squeezing force generated by the collision will cause the outer shell of the battery pack to be dented, distorted, etc. At the same time, the battery modules and battery cells inside the battery pack may also be damaged, and even cause internal short circuits of the battery. Once a short circuit occurs, it may trigger thermal runaway, and even cause consequences such as fire or explosion.

[0029] The structure of the battery pack generally includes a battery box body and battery modules arranged in the battery box body. The battery box body includes a bottom plate, a top plate, and side beams arranged between the top plate and the bottom plate. Among them, the side beams are the main load-bearing members for bearing side pillar collisions. At present, in order to prevent the side beams from invading the battery modules after being crushed by force, the safety distance between the battery modules and the side beams is generally increased, resulting in a low volume utilization rate of the battery box body.

[0030] The present invention proposes a battery box body.

[0031] Please refer to Figure 1, in an embodiment of the present invention, the battery box body includes a battery tray 100 and a top plate 400. The battery tray 100 includes a bottom plate 200 and side beams 300 connected to the outer edge of the bottom plate 200. The bottom plate 200 includes a bottom lower plate 220, a bottom cold plate 210, and a bottom guard plate 240 stacked in sequence. A bottom liquid cavity 230 for coolant flow is formed between the bottom cold plate 210 and the bottom lower plate 220. The top plate 400 is connected to one end of the side beam 300 away from the bottom plate 200. The top plate 400 includes a top cold plate 410 and a top lower plate 420 connected to each other. A top liquid cavity 430 for coolant flow is formed between the top cold plate 410 and the top lower plate 420; the top plate 400 and the battery tray 100 enclose a receiving cavity 520 for receiving the battery cells 510.

[0032] Specifically, the battery tray 100 includes a bottom plate 200 and side beams 300 connected to the outer edge of the bottom plate 200. It can be understood that generally, the battery module is in the shape of a cube or a cuboid. Correspondingly, the bottom plate 200 is square or rectangular. In one embodiment, side beams 300 are respectively connected to opposite sides of the bottom plate 200. After the battery box body is installed on the vehicle body, the two side beams 300 are respectively connected to the left and right vehicle door sills of the vehicle. For the convenience of description, the height direction of the battery box body is defined as the first direction, which is also the height direction of the vehicle, that is, the height direction of the side beams 300; the width direction of the battery box body is defined as the second direction, which is also the width direction of the vehicle, that is, the direction from one side beam 300 to the other side beam 300. Of course, in other embodiments, it can also be that side beams 300 are respectively connected to the four peripheries of the bottom plate 200.

[0033] The bottom plate 200 includes a bottom lower plate 220, a bottom cold plate 210, and a bottom guard plate 240 that are stacked in sequence. The bottom lower plate 220 is located above the bottom cold plate 210, and the side of the bottom lower plate 220 facing away from the bottom cold plate 210 is used to contact the battery cell 510. In one embodiment, the bottom lower plate 220 is configured as a flat plate. The bottom cold plate 210 includes a plurality of bottom convex portions 211 arranged at intervals. A plurality of bottom liquid cavities 230 are formed between the bottom lower plate 220 and the plurality of bottom convex portions 211. The flat setting of the bottom lower plate 220 ensures the contact area with the battery cell 510 to ensure that the battery cell 510 can be stably located on the battery tray 100. The bottom cold plate 210 is provided with a plurality of bottom convex portions 211 arranged at intervals along the second direction. The arrangement of the bottom convex portions 211 causes a bottom liquid cavity 230 to be formed between the bottom cold plate 210 and the bottom flat plate. In one embodiment, the bottom liquid cavity 230 extends in a direction perpendicular to the second direction. There is coolant in the bottom liquid cavity 230, and the coolant is used to exchange heat with the battery cell 510 to cool down the battery cell 510. The bottom cold plate 210 further includes a mounting bottom provided between adjacent bottom convex portions 211. The mounting bottom is used to connect with the bottom lower plate 220 to seal the bottom liquid cavity 230 to prevent the leakage of the coolant. In one embodiment, the mounting bottom is connected to the bottom lower plate 220 through a heat-conducting adhesive, so as to improve the cooling effect of the battery cell 510.

[0034] A bottom guard plate 240 is further connected below the bottom cold plate 210. In one embodiment, the bottom guard plate 240 is configured as a hollow profile. It can be understood that when the bottom of the battery box is impacted, the hollow profile first collapses to absorb part of the impact force and reduce the impact on the internal battery cell 510. In one embodiment, the bottom cold plate 210 and the bottom guard plate 240 are connected by gluing, that is, the side of the bottom convex portion 211 facing away from the bottom lower plate 220 is connected to the bottom guard plate 240. It can be understood that after the battery cell 510 is installed in the accommodation cavity 520, a safety distance along the second direction needs to be reserved between the battery cell 510 and the side beam 300 to allow the side beam 300 to deform when the vehicle is side-impacted by a pillar. The bottom liquid cavity 230 is arranged corresponding to the battery cell 510. At the positions corresponding to the safety distance and the side beam 300, the bottom cold plate 210 does not need to be provided with bottom convex portions 211, and a bottom cushion plate can be filled between the mounting bottom of the bottom cold plate 210 and the bottom guard plate 240 here.

[0035] The top plate 400 includes a top cold plate 410 and a top lower plate 420 located below the top cold plate 410. The side of the top lower plate 420 facing away from the top cold plate 410 is used to contact the battery cell 510. In one embodiment, the top lower plate 420 is configured as a flat plate, the top cold plate 410 includes a plurality of top convex bumps 411 arranged at intervals, and a plurality of top liquid cavities 430 are formed between the top lower plate 420 and the plurality of top convex bumps 411. The flat plate setting of the top lower plate 420 ensures the contact area with the battery cell 510 to ensure that the battery cell 510 can be stably located in the accommodation cavity 520. A plurality of top convex bumps 411 are arranged on the top cold plate 410 at intervals along the second direction. The setting of the top convex bumps 411 causes a top liquid cavity 430 to be formed between the top cold plate 410 and the bottom flat plate. In one embodiment, the top liquid cavity 430 extends in a direction perpendicular to the second direction. There is a coolant in the top liquid cavity 430, and the coolant is used to exchange heat with the battery cell 510 to cool the battery cell 510. The top cold plate 410 further includes a mounting top provided between adjacent bottom convex bumps 211, and the mounting top is used to be connected to the top lower plate 420 to seal the top liquid cavity 430 to prevent the leakage of the coolant. In one embodiment, the mounting top is connected to the top lower plate 420 through a heat-conducting adhesive, so as to improve the cooling effect of the battery cell 510.

[0036] It can be understood that the top liquid cavity 430 is arranged corresponding to the battery cell 510. At the positions corresponding to the safety distance and the side beam 300, the top cold plate 410 does not need to be provided with top convex bumps 411. In one embodiment, at the position where the top cold plate 410 has no top convex bumps 411, a top reinforcing plate 440 is further connected to the side facing away from the top lower plate 420 to enhance the overall structural strength of the top plate 400, to enhance the structural strength at the connection between the side beam 300 and the top plate 400, and to improve the resistance performance at the connection between the side beam 300 and the top plate 400.

[0037] Thus, compared with the prior art in which only the bottom plate 200 is set as a cavity structure and the top plate 400 is set as a flat plate structure, in the present invention, both the bottom plate 200 and the top plate 400 are set as cavity structures, which increases the thickness of the top plate 400, thereby improving the overall structural strength and stiffness of the top plate 400, improving the connection strength between the side beam 300 and the top plate 400. Thus, when a vehicle side pillar collision occurs, the conventional force transmission method mainly based on the bottom plate 200 in the prior art is changed to the force transmission method in which the top plate 400 and the bottom plate 200 evenly transmit at the same time in the present invention, thereby avoiding the separation between the side beam 300 and the top plate 400, thereby reducing the deformation amount of the side beam 300, enabling the safety distance to be reduced, so that more battery cells 510 can be arranged in the accommodation cavity 520, thereby improving the volume utilization rate of the battery box Figure 1The dashed lines therein are the structures after the side beam 300 is stressed and deformed). At the same time, a top liquid cavity 430 and a bottom liquid cavity 230 are respectively provided in the top plate 400 and the bottom plate 200, realizing the upper and lower cooling arrangements of the battery cell 510, which can effectively improve the performance degradation of the battery cell 510 due to excessive temperature inside and affect the service life, or safety risks such as short circuit and fire explosion caused by excessive temperature inside the battery cell 510; it can also achieve a higher fast charging technology.

[0038] To avoid the thickening of the top plate 400 affecting the height of the accommodation cavity 520 and thus affecting the number of battery cells 510 arranged in the accommodation cavity 520, in one embodiment, the sum of the thicknesses of the bottom plate 200 and the top plate 400 of the battery box remains unchanged. The thickness of the bottom plate 200 is reduced, and at the same time, the thickness of the top plate 400 is increased. In this way, while increasing the stiffness of the top plate 400, the influence on the height of the accommodation cavity 520 is also avoided.

[0039] In the embodiment of the present invention, in the direction from the bottom plate 200 to the top plate 400, the thickness of the bottom plate 200 is h1, and the thickness of the top plate 400 is h2, where 0.4*h1 ≤ h2 ≤ 0.5*h1.

[0040] Specifically, along the first direction, the bottom plate 200 and the top plate 400 respectively have a certain thickness. It can be understood that when the battery box is installed on the vehicle body, the top plate 400 is arranged upward, and the bottom plate 200 is arranged downward. Among them, the possibility of the bottom plate 200 being impacted and the impact force it bears are greater. In one embodiment, the thickness of the bottom plate 200 is greater than the thickness of the top plate 400, so that the structural strength and stiffness of the bottom plate 200 are greater than those of the top plate 400. More specifically, in one embodiment, through simulation experiments, it is verified that 0.4*h1 ≤ h2 ≤ 0.5*h1.

[0041] In the embodiment of the present invention, the side beam 300 includes a first end 311 connected to the bottom plate 200 and a second end 312 connected to the top plate 400. In the direction close to the inside of the accommodation cavity 520, the width of the first end 311 is w1, and the width of the second end 312 is w2, where 0.4*w1 ≤ w2 ≤ 0.8*w1.

[0042] Specifically, along the first direction, the side beam 300 has opposite first end 311 and second end 312. The first end 311 is used to connect to the bottom plate 200, and the second end 312 is used to connect to the top plate 400. Along the second direction, the first end 311 has a width w1, and the second end 312 has a width w2. In one embodiment, the side beam 300 further includes a suspension portion 360 arranged side by side with the first end 311, and the suspension portion 360 is used to connect to the vehicle body. It can be understood that when a side pole collision occurs to the vehicle, the collision force will be transmitted to the entire side beam 300 through the suspension portion 360. The collision force will first be transmitted to the first end 311, and the collision force borne by the first end 311 will be relatively large. Correspondingly, the width of the first end 311 is set to be greater than the width of the second end 312, that is, the connection area between the bottom of the side beam 300 and the bottom plate 200 is greater than the connection area between the top of the side beam 300 and the top plate 400, so as to make the bottom of the side beam 300 have stronger structural strength and stiffness. In one embodiment, through simulation experiments, it is verified that 0.4*w1 ≤ w2 ≤ 0.8*w1.

[0043] In an embodiment of the present invention, the side beam 300 includes a first section 321 close to the first end 311 and a second section 322 close to the second end 312. In the direction from the bottom plate 200 to the top plate 400, the first section 321 gradually narrows and is connected to the first section 321, and a first reinforcing rib 331 is formed therebetween; in the direction close to the inside of the accommodation cavity 520, the first reinforcing rib 331 is inclined upward.

[0044] Specifically, it can be understood that the width of the first end 311 of the side beam 300 is greater than the width of the second end 312. In the direction from the second end 312 to the first end 311, the side beam 300 is gradually arranged closer to the inside of the accommodation cavity 520 to improve the impact resistance of the side beam 300. Along the first direction, the side beam 300 includes a connected first section 321 and a second section 322, where the first section 321 is arranged close to the first end 311 and the second section 322 is arranged close to the second end 312. Both the first section 321 and the second section 322 are hollowed out to achieve the lightweight of the side beam 300, which is beneficial to the lightweight of the battery box. There is a first reinforcing rib 331 between the first section 321 and the second section 322. In the direction from the side beam 300 to the inside of the accommodation cavity 520, the first reinforcing rib 331 is inclined upward.

[0045] Along the second direction, the first section 321 has opposite inner sidewall and outer sidewall. Thus, when the outer sidewall of the side beam 300 is subjected to a collision force in the second direction, the upward inclination of the first reinforcing rib 331 will guide the first section 321 to deform inward and upward (such as Figure 1As shown by the dashed line in [the figure], after the inclined inner wall of the first section 321 deforms under force, it becomes a shape that is substantially parallel to the first direction. That is, after deformation, the inner wall of the first section 321 is substantially perpendicular to the bottom plate 200. At the same time, the thickened setting of the top plate 400 enhances the connection strength between the side beam 300 and the top plate 400, and the top of the side beam 300 will not separate from the top plate 400. Therefore, after the side beam 300 deforms under the impact force in the second direction, the inner wall of the first section 321 that is pulled up is closest to the battery cell 510. At this time, since the inner wall of the first section 321 is substantially perpendicular to the bottom plate 200, the side beam 300 can intrude in a large area form.

[0046] Compared with the prior art, the top plate 400 is set thinner. When the side beam 300 is subjected to an impact force in the second direction, the top of the side beam 300 separates from the top plate 400, and there is still partial connection between the bottom of the side beam 300 and the bottom plate 200, causing the side beam 300 to collapse in a form of toppling at the top, and the side beam 300 intrudes in a point form. It can be understood that compared with the intrusion in a point form, the intrusion in a large area form in the present invention is beneficial to reducing the displacement of the side beam 300 in the second direction, thereby being beneficial to reducing the reserved safety distance, and thus being beneficial to improving the volume utilization rate of the battery box.

[0047] In an embodiment of the present invention, the thickness of the outer wall of the first section 321 is d1, the thickness of the inner wall of the first section 321 is d2, and 1 / 3*d1 ≤ d2 < d1.

[0048] Specifically, when the side beam 300 is subjected to an impact force in the second direction, the impact force is transmitted from the outer wall of the first section 321 to the inner wall of the first section 321. It can be understood that the impact force received by the outer wall of the first section 321 is relatively large, and the impact force transmitted to the inner wall of the first section 321 is relatively small. The thickness of the outer wall of the first section 321 is set to be greater than the thickness of the inner wall of the first section 321. At the same time, since the top of the side beam 300 is connected to the top plate 400, due to the thickened setting of the top plate 400, when the side beam 300 is subjected to an impact force in the second direction, the top of the side beam 300 will not separate from the top plate 400. Thus, even if the thickness of the inner wall of the first section 321 is set to be less than the thickness of the outer wall of the first section 321, the inner wall of the first section 321 will not break and collapse. In one embodiment, through simulation experiments, it is verified that 1 / 3*d1 ≤ d2 < d1.

[0049] In an embodiment of the present invention, second reinforcing ribs 332 and third reinforcing ribs 333 are arranged at intervals in the second section 322, and the third reinforcing ribs 333 are located on the side of the second reinforcing ribs 332 away from the first reinforcing rib 331; in the direction close to the inside of the accommodation cavity 520, the second reinforcing ribs 332 are inclined upward, and the third reinforcing ribs 333 are inclined downward.

[0050] Specifically, the second section 322 is internally provided with a second reinforcing rib 332 and a third reinforcing rib 333 at intervals. The two reinforcing ribs in the second section 322 divide the second section 322 into three cavities, which is beneficial to the light weight of the side beam 300 and the light weight of the battery box body. In the direction from the bottom plate 200 to the top plate 400, the side beam 300 is successively provided with a first reinforcing rib 331, a second reinforcing rib 332, and a third reinforcing rib 333. In the direction from the side beam 300 to the inside of the accommodation cavity 520, the second reinforcing rib 332 is inclined upward, and at the same time, the third reinforcing rib 333 is inclined downward. In this way, the second reinforcing rib 332 and the third reinforcing rib 333 form an outer trumpet-shaped structure with an opening facing outward.

[0051] It can be understood that compared with the structure in which both the second reinforcing rib 332 and the third reinforcing rib 333 are horizontally arranged in the second direction, the outer trumpet-shaped structure is more stable. When the side beam 300 is subjected to an impact force in the second direction, the outer trumpet-shaped structure formed by the second reinforcing rib 332 and the third reinforcing rib 333 makes the connection between the second end 312 of the side beam 300 and the top plate 400 more reliable, avoiding the separation of the second end 312 from the top plate 400, and avoiding the inward tilting of the entire second section 322 after the separation of the second end 312 from the top plate 400. In this way, the second reinforcing rib 332 is inclined upward, and the third reinforcing rib 333 is inclined downward, improving the structural strength of the second section 322 of the side beam 300.

[0052] In the embodiment of the present invention, the second section 322 includes a first sub-section 323 and a second sub-section 324 separated by the second reinforcing rib 332. The second sub-section 324 is located on the side of the first sub-section 323 away from the first section 321. The thickness of the outer side wall of the first sub-section 323 is d3, and the thickness of the outer side wall of the second sub-section 324 is d4, and d3 > d4.

[0053] Specifically, in the second section 322, the first sub-section 323 and the second sub-section 324 are separated by the second reinforcing rib 332, where the first sub-section 323 is located between the first section 321 and the second sub-section 324. It can be understood that the upward inclination of the second reinforcing rib 332 and the downward inclination of the third reinforcing rib 333 enhance the structural strength of the second sub-section 324. Therefore, the thickness of the outer side wall of the second sub-section 324 is thinned. In this way, while not affecting the structural strength of the second sub-section 324, it is beneficial to the light weight of the side beam 300. In this way, the thickness of the outer side wall of the first sub-section 323 is greater than the thickness of the outer side wall of the second sub-section 324.

[0054] When a side pillar collision occurs to the vehicle, the side beam 300 is impacted by a collision force in the second direction. At this time, since the thickness of the outer wall of the first sub-segment 323 is greater than that of the outer wall of the second sub-segment 324, a collapse occurs between the first sub-segment 323 and the second sub-segment 324, causing the second segment 322 to deform outward in direction, which is beneficial to reducing the displacement of the side beam 300 in the second direction.

[0055] In an embodiment of the present invention, the side beam 300 is connected to the bottom plate 200 through a first bolt structure 351. The first segment 321 defines a first cavity 341, and at least a part of the first bolt structure 351 is disposed in the first cavity 341. The first bolt structure 351 has two rows; and / or

[0056] The side beam 300 is connected to the top plate 400 through a second bolt structure 352. The second segment 322 defines a second cavity 342, and at least a part of the second bolt structure 352 is disposed in the second cavity 342.

[0057] Specifically, in one embodiment, the side beam 300 is connected to the bottom plate 200 through a first bolt structure 351. In the solution shown in the figure of the present invention, the first segment 321 defines a first cavity 341. A first connection hole communicating with the first cavity 341 is opened on the first end 311. At the same time, a second connection hole is opened on the bottom plate 200. The first bolt structure 351 passes through the second connection hole and the first connection hole and extends into the first cavity 341, thereby realizing the connection between the side beam 300 and the bottom plate 200. It can be understood that when a side pillar collision occurs to the vehicle and the side beam 300 is impacted by a collision force in the second direction, the first bolt structure 351 will be subjected to a shearing force and there is a risk of fracture. In one embodiment, through simulation experiments, it is verified that the first bolt structure 351 has two rows, so that the risk of fracture of the first bolt structure 351 can be reduced.

[0058] It can be understood that a sealing structure also needs to be provided between the side beam 300 and the bottom plate 200 to ensure the sealing performance of the accommodation cavity 520. In one embodiment, the first end 311 of the side beam 300 and the bottom plate 200 are adhesively sealed. The width w1 of the first end 311 of the side beam 300 also needs to meet the sealing requirements with the bottom plate 200 to ensure the sealing effect. In one embodiment, 0.4*w1 ≤ w2 ≤ 0.8*w1, so that both the structural strength of the side beam 300 and the sealing effect between the side beam 300 and the bottom plate 200 are ensured.

[0059] In one embodiment, the side beam 300 is connected to the top plate 400 through the second bolt structure 352. In the solution shown in the figures of the present invention, the second section 322 defines a second cavity 342, and a third connection hole communicating with the second cavity 342 is formed in the second end 312. At the same time, a fourth connection hole is formed in the top plate 400. The second bolt structure 352 passes through the fourth connection hole and the third connection hole and extends into the second cavity 342, thereby realizing the connection between the side beam 300 and the top plate 400. Here, no specific models of the first bolt structure 351 and the second bolt structure 352 are limited.

[0060] The present invention also provides a vehicle, which includes a battery box. The specific structure of the battery box refers to the above embodiments. Since this vehicle adopts all the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here. Among them, the battery box is installed on the vehicle body.

[0061] The above are only exemplary embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made under the technical concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A battery box, characterized in that: include: A battery tray, comprising a bottom plate and a side beam connected to an outer edge of the bottom plate, wherein the bottom plate comprises a bottom lower plate, a bottom cold plate and a bottom guard plate stacked in sequence, and a bottom liquid cavity for coolant flow is formed between the bottom cold plate and the bottom lower plate; as well as A top plate is connected to one end of the side beam away from the bottom plate, the top plate includes a top cold plate and a top lower plate connected to each other, a top liquid cavity for coolant to flow is formed between the top cold plate and the top lower plate; the top plate and the battery tray together enclose a cavity for accommodating battery cells.

2. The battery box according to claim 1, characterized in that: In the direction from the bottom plate to the top plate, the thickness of the bottom plate is h1, the thickness of the top plate is h2, and 0.4*h1≤h2≤0.5*h1.

3. The battery case according to claim 1, characterized in that: The side beam includes a first end connected to the bottom plate and a second end connected to the top plate. In the direction close to the interior of the accommodating cavity, the width of the first end is w1, the width of the second end is w2, and 0.4*w1≤w2≤0.8*w1.

4. The battery case according to claim 3, characterized in that: The side beam includes a first section close to the first end and a second section close to the second end. In the direction from the bottom plate to the top plate, the first section gradually narrows and is connected to the first section, and a first reinforcing rib is formed between the two. In the direction close to the interior of the accommodating cavity, the first reinforcing rib is arranged to be inclined upward.

5. The battery case according to claim 4, characterized in that: The thickness of the outer wall of the first section is d1, the thickness of the inner wall of the first section is d2, and 1 / 3*d1≤d2<d1.

6. The battery case according to claim 4, characterized in that: The second section is provided with a second reinforcing rib and a third reinforcing rib at intervals, and the third reinforcing rib is located on a side of the second reinforcing rib away from the first reinforcing rib; in a direction close to the interior of the accommodating cavity, the second reinforcing rib is arranged to be inclined upward, and the third reinforcing rib is arranged to be inclined downward.

7. The battery case according to claim 6, characterized in that: The second section includes a first subsection and a second subsection separated by the second reinforcement rib. The second subsection is located on a side of the first subsection away from the first section. The thickness of the outer wall of the first subsection is d3, and the thickness of the outer wall of the second subsection is d4, and d3>d4.

8. The battery case according to claim 4, characterized in that: The side beam is connected to the bottom plate via a first bolt structure, the first section defines a first cavity, at least part of the first bolt structure is disposed in the first cavity, and the first bolt structure is provided in two rows; and / or The side beam is connected to the top plate via a second bolt structure, the second section defines a second cavity, and at least a portion of the second bolt structure is disposed in the second cavity.

9. The battery case according to claim 1, characterized in that: The bottom lower plate is configured as a flat plate, the bottom cold plate includes a plurality of bottom convex hulls arranged at intervals, and a plurality of bottom liquid cavities are formed between the bottom lower plate and the plurality of bottom convex hulls; The top lower plate is configured as a flat plate, the top cold plate includes a plurality of top convex hulls arranged at intervals, and a plurality of top liquid chambers are formed between the top lower plate and the plurality of top convex hulls.

10. A vehicle, characterized in that: It comprises a battery box as described in any one of claims 1 to 9, wherein the battery box is installed on a vehicle body.

Images