CN219106377U

CN219106377U - Vacuum box structure and battery pack

Info

Publication number: CN219106377U
Application number: CN202222860189.4U
Authority: CN
Inventors: 张本府; 赵恒喜; 卢卿; 李左营; 刘振雨; 丁涛
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-05-30
Anticipated expiration: 2032-10-28

Abstract

The utility model relates to the technical field of batteries and discloses a vacuum box structure and a battery pack, wherein the vacuum box structure comprises a plurality of cavity plates and sealing strips, each cavity plate comprises an inner layer plate, an outer layer plate and a interlayer plate, and the inner layer plate and the outer layer plate are oppositely arranged along the thickness direction of the cavity plate and are connected through the interlayer plates so that each cavity plate forms at least one cavity. The plurality of cavity plates are combined to form the box body in a vacuum environment, and both ends of the cavity of the box body are sealed by the sealing strips, so that the plurality of cavities can be sealed to form the vacuum cavity, the box body becomes the vacuum box body, and the box body is provided with a containing cavity which can be used for placing the battery cell so as to form the battery pack box body. The vacuum cavity can effectively improve the heat insulation performance of the battery pack box body, the heat insulation foam is omitted, the grouping space of the battery pack is enlarged, each cavity plate is provided with a plurality of cavities, the strength of the box body is higher, the external impact force can be better resisted, and the box body is prevented from being deformed or damaged.

Description

Vacuum box structure and battery pack

Technical Field

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

Background

The battery pack box adopts the aluminium stamping workpiece of entity, and its heat preservation effect is not good, needs to increase the heat preservation foam and improves the heat preservation performance, and this makes the process of group technology more, and the heat preservation foam has still taken up certain space simultaneously, is unfavorable for the improvement of battery pack space utilization. Set up the vacuum layer between the battery package box, can utilize the unable heat conduction's of vacuum characteristic to improve the heat preservation performance of battery package, but set up the cavity in order to form the vacuum layer between the box, this makes the battery package under the influence of external force, and the box can probably produce the deformation because of intensity is not enough, thereby influences the life of battery package.

Therefore, a vacuum box structure and a battery pack are needed to solve the above problems.

Disclosure of Invention

An object of the present utility model is to provide a vacuum box structure capable of improving the heat insulation performance of a battery pack while ensuring the structural strength of the box.

The technical scheme adopted by the utility model is as follows:

the cavity plates are arranged in a surrounding mode to form a box body with a containing cavity, each cavity plate comprises an inner layer plate, an outer layer plate and a partition plate, and the inner layer plate and the outer layer plates are arranged oppositely and connected through the partition plates along the thickness direction of the cavity plate so as to form at least one cavity in a surrounding mode;

the sealing strips are plugged at two ends of the cavity of the box body, so that a plurality of cavities are sealed into a vacuum cavity;

optionally, the cavity plate is formed by an extrusion process.

Optionally, the plurality of cavity plates includes a U-shaped structure cavity plate and a rectangular structure cavity plate; or alternatively, the first and second heat exchangers may be,

the cavity plates are rectangular structure cavity plates.

Optionally, a plurality of the cavity plates are welded to form the case, and the sealing strips are welded to both ends of the cavity of the case.

Optionally, along the thickness direction of the cavity plate, the thickness of the inner layer plate is t1, t1 is more than or equal to 1.2mm, the thickness of the outer layer plate is t2, t2 is more than or equal to 1.2mm, and the height of the interlayer plate is h, wherein h is more than or equal to 2mm.

Optionally, in the plane where the cavity plates are located, the distance between two adjacent partition plates is l, i is greater than or equal to 10mm, and the distance between two adjacent cavities is t3, t3 is greater than or equal to 0.5mm, perpendicular to the extending direction of the partition plates.

Optionally, the box body includes a bottom and a side portion surrounding the bottom in a circumferential direction, and the thickness of the inner layer plate of the cavity plate of the bottom is greater than the thickness of the inner layer plate of the cavity plate of the side portion; and/or the number of the groups of groups,

the thickness of the outer layer plate of the cavity plate of the bottom is greater than the thickness of the outer layer plate of the cavity plate of the side.

Optionally, the vacuum box structure further comprises an insulating sheet, and the insulating sheet is arranged on the inner wall of the accommodating cavity.

Optionally, the thickness of the insulating sheet is t4, and 1mm is more than or equal to t4 and more than or equal to 0.5mm.

The utility model further aims to provide a battery pack which is high in structural strength and good in heat preservation performance.

The technical scheme adopted by the utility model is as follows:

the battery pack comprises the vacuum box body structure.

The beneficial effects of the utility model are as follows:

the vacuum box structure provided by the utility model comprises a plurality of cavity plates and sealing strips, wherein each cavity plate comprises an inner layer plate, an outer layer plate and a interlayer plate, and the inner layer plate and the outer layer plate are oppositely arranged along the thickness direction of the cavity plate and are connected through the interlayer plates so that each cavity plate forms at least one cavity. The plurality of cavity plates are combined in a vacuum environment to form a box body, sealing strips are plugged at two ends of the cavity exposed by the cavity plates of the formed box body, so that the plurality of cavities can be sealed to form a vacuum cavity, and the box body becomes a vacuum box body. The box body is provided with a containing cavity, and the containing cavity is used for containing the battery cell so as to form a battery pack box body. The vacuum cavity can effectively improve the heat insulation performance of the battery pack box body, reduce heat loss, omit the heat insulation foam, enlarge the grouping space of the battery pack, and the plurality of cavities of each cavity plate enable the strength of the box body formed by assembly to be higher, can better resist external impact force, and avoid the deformation or damage of the box body.

The battery pack provided by the utility model comprises the vacuum box body structure, so that the heat preservation performance of the battery pack can be improved while the structural strength of the box body is ensured.

Drawings

FIG. 1 is a schematic view of a cavity plate according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a vacuum box provided by an embodiment of the present utility model;

fig. 3 is an assembled cross-sectional view of a vacuum box structure and a battery cell provided by an embodiment of the present utility model.

In the figure:

1. a cavity plate; 10. a cavity; 11. an inner layer plate; 12. an outer layer plate; 13. a separator plate;

2. an insulating sheet;

100. a case; 1001. a bottom; 1002. a side portion;

200. and a battery cell.

Detailed Description

In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the utility model more clear, the technical scheme of the utility model is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present utility model are shown.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The technical scheme of the utility model is further described below by the specific embodiments with reference to the accompanying drawings.

This embodiment provides a vacuum box structure, and it not only can effectively improve the heat preservation effect of battery package box, avoids the low temperature environment to the influence that the battery package performance caused, still can further improve the intensity of battery package box, avoids the battery package to influence its life because of external force damage in the use.

As shown in fig. 1 and 2, the vacuum box structure includes a plurality of cavity plates 1, each cavity plate 1 includes an inner plate 11, an outer plate 12, and a barrier plate 13, the inner plate 11 and the outer plate 12 are disposed opposite to each other in a thickness direction of the cavity plate 1 and are connected by the barrier plate 13, so that each cavity plate 1 has at least one cavity 10 defined by the inner plate 11, the outer plate 12, and the barrier plate 13. Further, the vacuum box structure further includes a sealing strip, the plurality of cavity plates 1 can be combined in a vacuum environment according to the shape of the box structure to form the box 100, and then both ends of the exposed cavity 10 of the cavity plate 1 of the formed box 100 are plugged, so that the plurality of cavities 10 of the box 100 are sealed to form a vacuum cavity, and the box 100 is also the vacuum box. The case 100 has a receiving cavity that can be used to place the battery cell 200.

It is known that when the battery pack box body has a vacuum cavity, heat conduction cannot be realized in the vacuum environment, so that the heat insulation performance of the battery pack box body can be improved, heat loss is reduced, and when the heat insulation performance of the battery pack is good, heat insulation foam is not required to be arranged in the battery pack box body in the actual production process, so that the installation procedure is reduced, and the grouping space of the battery pack can be enlarged. In addition, each cavity plate 1 provided in the present embodiment has a plurality of cavities 10, that is, the inner layer plate 11 and the outer layer plate 12 of each cavity plate 1 are reinforced by the interlayer plate 13, so that the strength of the assembled box 100 is higher, the external impact force can be better resisted, and the deformation or damage of the box 100 is avoided.

In this embodiment, the cavity plate 1 may be manufactured by an extrusion process, that is, the inner layer plate 11, the outer layer plate 12 and the interlayer plate 13 of each cavity plate 1 are integrally manufactured and formed, so that the processing procedures may be reduced, and the stress distribution of the cavity plate 1 is more uniform by the extrusion process, so that the strength of each position of the box 100 is more uniform. In addition, because the multi-cavity structure design of the cavity plate 1 effectively improves the structural strength of the box body 100, the cavity plate 1 provided by the embodiment can be made of aluminum materials, and compared with the conventional battery pack box body manufactured by steel materials, the density of the aluminum materials is smaller, and the weight of the aluminum materials is lighter. Of course, in other embodiments, according to the structural strength design requirement of the battery pack case, the cavity plate 1 may be made of other materials suitable for the extrusion process, which will not be described herein.

Further, the case 100 is formed using a welding process. The cavity plate 1 manufactured by adopting the extrusion process has the cavity 10 extending along the extrusion direction of the cavity plate 1, and two ends of the cavity 10 are open ends, so that a plurality of cavity plates 1 can be combined and welded firstly, and then two ends of the cavity 10 of the exposed cavity plate 1 are welded and sealed by adopting the sealing strip. In order to ensure that the welded cavity 10 is a vacuum cavity, the cavity plate 1 needs to be placed in a vacuum box at the same time in the welding process so as to pump the gas in the cavity 10 and then weld and seal.

Alternatively, the plurality of cavity plates 1 may include a U-shaped structure cavity plate and a rectangular structure cavity plate, that is, the U-shaped structure cavity plate may be used as the bottom surface and the side surface of the case 100, and then two rectangular structure cavity plates may be selected as the two end surfaces of the case 100. If the cavity plate 1 is easy to process, only the rectangular cavity plate may be processed, and the box 100 may be assembled by using at least five cavity plates 1 as the bottom surface, two side surfaces and two end surfaces, respectively.

In order to reduce the number of the leaked cavities 10 after the welding of the box 100 is completed, when the box 100 is assembled, as shown in fig. 3, the cavities 10 of the cavity plates with the U-shaped structure extend along the first direction, the cavities 10 of the cavity plates with the rectangular structure extend along the second direction, the cavity plates with the rectangular structure are welded with the two ends of the cavity plates with the U-shaped structure, and then the two ends of the cavities 10 of the cavity plates with the U-shaped structure in the second direction can be sealed and welded by using sealing strips. The first direction is the oa direction in fig. 3, the second direction is the ob direction in fig. 3, and the first direction is perpendicular to the second direction. Preferably, a protruding part is provided on one side of the sealing strip, and when the sealing strip and the cavity plate 1 are welded, the protruding part can be inserted into the cavity 10 of the cavity plate 1 to fix the sealing strip and the cavity plate 1 relatively, and then the sealing strip and the cavity plate 1 are welded.

Preferably, the height of the division plate 13 is h.gtoreq.2 mm along the thickness direction of the cavity plate 1, and the height of the division plate 13 is the thickness of the vacuum chamber. In the concrete implementation, the thickness of the vacuum cavity can be set according to the practical application environment and the heat preservation grade, but the excessive thickness of the cavity plate 1 is avoided while the heat preservation effect is ensured, so that the production cost and the volume of the battery pack are not increased.

Preferably, the thickness of the vacuum chamber is reduced in different embodiments, and the thickness of the inner plate 11 and the outer plate 12 is reduced, so that the overall thickness of the chamber plate 1 is reduced. In this embodiment, since the cavity plate 1 has a plurality of spacer plates 13 disposed at intervals, the thickness of the inner plate 11 is t1, t1 is greater than or equal to 1.2mm, the thickness of the outer plate 12 is t2, t2 is greater than or equal to 1.2mm along the thickness direction of the cavity plate 1, and if the thicknesses of the inner plate 11 and the outer plate 12 are too small, the strength of the cavity plate 1 is insufficient to support the weight of the battery cell 200.

Preferably, in the plane of the cavity plate 1, perpendicular to the extending direction of the interlayer plates 13, the distance between two adjacent interlayer plates 13 is l, i is larger than or equal to 10mm, and the distance between two adjacent cavities 1 is t3, t3 is larger than or equal to 0.5mm. The spacing between two adjacent cavities 1 is the thickness of the interlayer plate 13, the larger the thickness of the interlayer plate 13 and the smaller the distance between the adjacent interlayer plates 13 are, the structural strength of the cavity plate 1 can be improved, the thickness of the interlayer plate 13 can be set as small as possible under the condition of ensuring the strength of the cavity plate, and the distance between the two adjacent interlayer plates 13 is as large as possible, so that the processing and the material saving are facilitated.

In addition, based on the structural characteristics of the battery pack, as shown in fig. 2, the case 100 includes a bottom 1001 and a side 1002, the side 1002 is surrounded on the circumference of the bottom 1001, and the battery cell 200 and other control elements are placed in the accommodating cavity of the case 100, that is, all exert a certain force on the bottom 1001 of the case 100. Preferably, cavity plate 1 of bottom 1001 has a thickness a and cavity plate 1 of side 1002 has a thickness b, a. Gtoreq.b. Wherein the thickness of the inner layer plate 11 of the cavity plate 1 of the bottom 1001 is t1a, the thickness of the outer layer plate 12 of the cavity plate 1 of the bottom 1001 is t2a, and the height of the interlayer plate 13 of the cavity plate 1 of the bottom 1001 is ha, a=t1a+t2a+ha. The thickness of the inner layer plate 11 of the cavity plate 1 of the side portion 1002 is t1b, the thickness of the outer layer plate 12 of the cavity plate 1 of the side portion 1002 is t2b, the height of the spacer plate 13 of the cavity plate 1 of the side portion 1002 is hb, b=t1b+t2b+hb, and t1a > t1b and/or t2a > t2b.

Further, the vacuum box structure further includes an insulation sheet 2, where the insulation sheet 2 is disposed on an inner wall of the accommodating cavity, so as to ensure insulation between the battery cell 200 and the box 100. In this embodiment, the insulating sheet 2 is made of PC (polycarbonate) material, which has the characteristics of fire resistance, flame retardance, insulation, high temperature resistance, environmental protection, etc., and the insulating sheet 2 can be fixed relative to the case 100 by means of gluing.

Preferably, the thickness of the insulating sheet 2 is t4,1mm is greater than or equal to t4 and greater than or equal to 0.5mm.

As shown in fig. 3, this embodiment also provides a battery pack, including the vacuum box structure described above, the heat insulation performance of the battery pack can be improved while the structural strength of the battery pack box is ensured.

The above embodiments merely illustrate the basic principle and features of the present utility model, and the present utility model is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. Vacuum box structure, its characterized in that includes:

the cavity plates (1) are arranged in a surrounding manner to form a box body (100) with a containing cavity, each cavity plate (1) comprises an inner layer plate (11), an outer layer plate (12) and a interlayer plate (13), and the inner layer plate (11) and the outer layer plate (12) are arranged oppositely along the thickness direction of the cavity plate (1) and are connected through the interlayer plates (13) to form at least one cavity (10) in a surrounding manner;

the sealing strips are plugged at two ends of the cavity (10) of the box body (100), so that a plurality of cavities (10) are sealed into a vacuum cavity.

2. Vacuum box structure according to claim 1, characterized in that the cavity plate (1) is formed by an extrusion process.

3. Vacuum box structure according to claim 2, characterized in that a plurality of said cavity plates (1) comprises a U-shaped structure cavity plate and a rectangular structure cavity plate; or alternatively, the first and second heat exchangers may be,

the cavity plates (1) are rectangular-structure cavity plates.

4. Vacuum box structure according to claim 1, characterized in that a plurality of the cavity plates (1) are welded to form the box (100), the sealing strips being welded to both ends of the cavity (10) of the box (100).

5. A vacuum box structure according to any of claims 1-4, characterized in that the thickness of the inner layer plate (11) is t1, t1 is not less than 1.2mm, the thickness of the outer layer plate (12) is t2, t2 is not less than 1.2mm, the height of the barrier plate (13) is h, h is not less than 2mm, in the thickness direction of the cavity plate (1).

6. A vacuum box structure according to any of claims 1-4, characterized in that in the plane of the cavity plate (1) perpendicular to the direction of extension of the barrier plates (13), the distance between two adjacent barrier plates (13) is l, i being larger than or equal to 10mm, the distance between two adjacent cavities (10) is t3, t3 being larger than or equal to 0.5mm.

7. The vacuum box structure according to any of the claims 1 to 4, characterized in that the box (100) comprises a bottom (1001) and a side (1002) surrounding the bottom (1001), the thickness of the inner layer plate (11) of the cavity plate (1) of the bottom (1001) being greater than the thickness of the inner layer plate (11) of the cavity plate (1) of the side (1002); and/or the number of the groups of groups,

the thickness of the outer layer plate (12) of the cavity plate (1) of the bottom (1001) is greater than the thickness of the outer layer plate (12) of the cavity plate (1) of the side (1002).

8. The vacuum box structure according to claim 1, further comprising an insulating sheet (2), the insulating sheet (2) being arranged on an inner wall of the receiving cavity.

9. Vacuum box structure according to claim 8, characterized in that the thickness of the insulating sheet (2) is t4,1mm not less than t4 not less than 0.5mm.

10. Battery pack, characterized in that it comprises a vacuum box structure according to any one of claims 1-9.