Battery box body and battery pack

Abstract

The utility model provides a battery box body and a battery pack, and the battery box body comprises a shell which is provided with an accommodating cavity, and an air inlet side and an air outlet side which are communicated with the accommodating cavity; and the thermal expansion pieces are arranged in the containing cavity, the thermal expansion pieces are arranged at the positions, close to the air inlet side and close to the air outlet side, of the containing cavity, and when thermal runaway is generated in the containing cavity, the thermal expansion pieces are used for absorbing heat in the containing cavity and expanding so as to block the air inlet side and the air outlet side. By applying the technical scheme of the utility model, the technical problem that the battery pack is easy to spread heat can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery box and a battery pack. Background Art

[0002] With the rapid development of new energy vehicles, people are pursuing higher and higher vehicle power and driving range. However, when the battery cells in the battery pack experience thermal runaway, a large amount of heat will be released in a short period of time. The released heat will be transferred to other battery cells or modules through heat transfer and other heat transfer methods, causing other battery cells or modules to lose control, and then causing the entire battery pack to lose control. In related solutions, nano-insulation materials or aerogel materials will be added between the battery cells to prevent heat spread. However, when a thermal runaway occurs in an air-cooled battery pack with a protection level of IP20, when external air enters the battery pack, it will cause the hot air inside the battery pack to flow to other locations, causing the entire battery pack to spread heat. Utility Model Content

[0003] The embodiments of the utility model provide a battery box and a battery pack, which can improve the technical problem that heat spread easily occurs in the battery pack.

[0004] In the first aspect, an embodiment of the utility model provides a battery case, comprising: a shell having a accommodating cavity and an air inlet side and an air outlet side connected to the accommodating cavity; a thermal expansion component arranged in the accommodating cavity, and the thermal expansion component is arranged near the air inlet side and near the air outlet side. When thermal runaway occurs inside the accommodating cavity, the thermal expansion component is used to absorb the heat in the accommodating cavity and expand to block the air inlet side and the air outlet side.

[0005] In one embodiment, the battery box further includes a receiving assembly, which is disposed in the accommodating cavity, and is disposed near the air inlet side and / or near the air outlet side, and the thermal expansion member is disposed on the receiving assembly.

[0006] In one embodiment, the receiving assembly includes a first receiving member having a plurality of first bending segments connected in sequence, the plurality of first bending segments are enclosed to form a first annular structure, and a heat expansion member is provided on at least the inner side wall and the outer side wall of the first annular structure.

[0007] In one embodiment, the receiving assembly also includes: a second receiving member, having a plurality of second bending sections connected in series, the plurality of second bending sections are enclosed to form a second annular structure, the circumference of the second annular structure is smaller than the circumference of the first annular structure, and at least the inner side wall and the outer side wall of the second annular structure are provided with heat expansion members; and / or a third receiving member, having a plurality of third bending sections connected in series, the plurality of third bending sections are enclosed to form a third annular structure, the circumference of the third annular structure is smaller than the circumference of the second annular structure, and at least the inner side wall and the outer side wall of the third annular structure are provided with heat expansion members; wherein the first receiving member is arranged on the outer periphery of the second receiving member along the outer side wall of the second receiving member, and the second receiving member is arranged on the outer periphery of the third receiving member along the outer side wall of the third receiving member.

[0008] In one embodiment, the second annular structure and the third annular structure are both coaxially arranged with the first annular structure.

[0009] In one embodiment, the receiving assembly further includes a connecting member, and the first receiving member and the second receiving member, as well as the second receiving member and the third receiving member are fixedly connected via the connecting member.

[0010] In one embodiment, the thickness of the heat expansion member is H, 0.6 mm ≤ H ≤ 2 mm.

[0011] In one embodiment, a connecting hole is provided on the first receiving member, the axis of the connecting hole is perpendicular to the axis of the first annular structure, and the first receiving component is fixedly connected to the shell through the connecting hole.

[0012] In one embodiment, the shell includes an upper cover and a bottom plate, a receiving cavity is formed between the upper cover and the bottom plate, and the receiving component is fixedly connected to the upper cover and / or the bottom plate through a connecting hole.

[0013] In the second aspect, an embodiment of the utility model provides a battery pack, which includes: the above-mentioned battery case; a DC converter, which is arranged in the accommodating cavity of the battery case; a heat sink, which is arranged on the air inlet side of the battery case; and a battery module, which is arranged in the accommodating cavity of the battery case with a spacing from the DC converter.

[0014] By applying the technical solution of the utility model, a thermal expansion component is arranged inside the battery case, and thermal expansion components are arranged near the air inlet side and near the air outlet side. When thermal runaway occurs inside the accommodating cavity, the thermal expansion component absorbs part of the heat and expands to seal the air inlet side and the air outlet side to prevent outside air from entering the accommodating cavity. At the same time, it can also prevent the hot air inside the accommodating cavity from flowing to other positions, preventing heat from spreading inside the battery pack. This can protect other components and improve the safety of the battery pack when in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the assembly of a battery pack provided by an embodiment of the utility model;

[0017] Figure 2 It is a partial structural schematic diagram of a battery box provided by an embodiment of the utility model;

[0018] Figure 3 It is a bottom view schematic diagram of the installation of the upper cover and the receiving assembly provided by the embodiment of the utility model;

[0019] Figure 4 It is a structural schematic diagram of a receiving assembly located on the air inlet side provided by an embodiment of the utility model;

[0020] Figure 5 It is a schematic diagram of the installation of the receiving assembly and the thermal expansion member on the air inlet side provided by the embodiment of the utility model;

[0021] Figure 6 yes Figure 5 Schematic diagram of the structure of the medium heat expansion component after expansion;

[0022] Figure 7 It is a structural schematic diagram of a receiving assembly located on the air inlet side provided by an embodiment of the utility model;

[0023] Figure 8 It is a schematic diagram of the installation of the receiving assembly and the thermal expansion member on the air outlet side provided by the embodiment of the utility model;

[0024] Fig. 9 yes Figure 8 Schematic diagram of the structure of the medium heat expansion component after expansion.

[0025] The above drawings include the following reference numerals:

[0026] 10. Shell; 11. Accommodating chamber; 12. Air inlet side; 13. Air outlet side; 14. Upper cover; 15. Bottom plate;

[0027] 20. Thermal expansion parts;

[0028] 30. Supporting component; 31. First supporting member; 311. First bending section; 32. Second supporting member; 321. Second bending section; 33. Third supporting member; 331. Third bending section; 34. Connecting member; 35. Connecting hole; 40. DC converter; 50. Heat sink; 60. Battery module. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0030] like Figures 1 to 9 As shown, in the first aspect, an embodiment of the utility model provides a battery case, the battery case comprising: a shell 10, having a accommodating cavity 11 and an air inlet side 12 and an air outlet side 13 connected to the accommodating cavity 11; a thermal expansion member 20, arranged in the accommodating cavity 11, and the thermal expansion member 20 is arranged at a position close to the air inlet side 12 and a position close to the air outlet side 13. When thermal runaway occurs inside the accommodating cavity 11, the thermal expansion member 20 is used to absorb the heat in the accommodating cavity 11 and expand to block the air inlet side 12 and the air outlet side 13.

[0031] By applying the technical solution of the utility model, a thermal expansion member 20 is arranged inside the battery case, and a thermal expansion member 20 is arranged near the air inlet side 12 and near the air outlet side 13. When thermal runaway occurs inside the accommodating cavity 11, the thermal expansion member 20 absorbs part of the heat and expands to block the air inlet side 12 and the air outlet side 13 to prevent outside air from entering the accommodating cavity 11. At the same time, it can also prevent the hot air inside the accommodating cavity 11 from flowing to other positions, thereby preventing heat from spreading inside the battery pack. This can protect other components and improve the safety of the battery pack when in use.

[0032] In the present application, the air inlet side 12 and the air outlet side 13 are located at opposite ends of the housing 10, which can increase the air circulation rate inside the accommodating cavity 11 and facilitate heat dissipation of components inside the battery box. In other embodiments of the present application, the air inlet side 12 and the air outlet side 13 can also be set at other positions of the housing 10 as long as the heat dissipation requirements of the battery box can be met.

[0033] In the present application, glass fiber can be selected as the heat expansion member 20. Optionally, the heat expansion member 20 can also be made of phase change material or other materials. The specific setting should be selected according to the use environment of the battery box, and no specific limitation is made here.

[0034] Specifically, the battery case also includes a receiving assembly 30, which is arranged in the accommodating cavity 11, and is arranged near the air inlet side 12 and / or near the air outlet side 13, and the thermal expansion member 20 is arranged on the receiving assembly 30. By setting the above structure, the position of the thermal expansion member 20 can be fixed to prevent the thermal expansion member 20 from moving when the battery pack is in normal operation. In this way, when thermal runaway occurs in the battery pack, the thermal expansion member 20 can timely block the air inlet side 12 and the air outlet side 13, thereby improving the blocking efficiency of the thermal expansion member 20.

[0035] Further, the receiving assembly 30 includes a first receiving member 31, the first receiving member 31 has a plurality of first bending sections 311 connected in sequence, the plurality of first bending sections 311 are enclosed to form a first annular structure, and at least the inner side wall and the outer side wall of the first annular structure are provided with a heat expansion member 20. In the present application, the first receiving member 31 is a square structure, and optionally, the first receiving member 31 can also be provided with a trapezoidal or polygonal structure, as long as the receiving requirements of the receiving member can be met. At the same time, the other two side walls of the first annular structure can also be provided with a heat expansion member 20, and the specific setting situation should be selected according to the use environment of the battery box, and no specific limitation is made here.

[0036] Specifically, the receiving assembly 30 also includes: a second receiving member 32, having a plurality of second bending sections 321 connected in series, the plurality of second bending sections 321 are enclosed to form a second annular structure, the circumference of the second annular structure is smaller than the circumference of the first annular structure, and at least the inner and outer walls of the second annular structure are provided with a heat expansion member 20; and / or a third receiving member 33, having a plurality of third bending sections 331 connected in series, the plurality of third bending sections 331 are enclosed to form a third annular structure, the circumference of the third annular structure is smaller than the circumference of the second annular structure, and at least the inner and outer walls of the third annular structure are provided with a heat expansion member 20; wherein, the first receiving member 31 is arranged around the outer periphery of the second receiving member 32 along the outer wall of the second receiving member 32, and the second receiving member 32 is arranged around the outer periphery of the third receiving member 33 along the outer wall of the third receiving member 33. By setting the above-mentioned structure, the internal space of the first receiving member 31 is utilized as much as possible, and the number of thermal expansion members 20 is increased. When thermal runaway occurs inside the battery pack, more thermal expansion members 20 can be used to quickly seal the air inlet side 12 and the air outlet side 13, thereby improving the sealing efficiency of the thermal expansion members 20 to prevent the risk of heat spread in the battery pack.

[0037] In the present application, the second receiving member 32 and the third receiving member 33 are square structures. Optionally, the second receiving member 32 and the third receiving member 33 can also be set to a trapezoidal or polygonal structure, as long as the receiving requirements of the receiving member can be met. At the same time, heat expansion members 20 can also be set on the other two side walls of the second annular structure and the third annular structure. The specific setting should be selected according to the use environment of the battery box, and no specific restrictions are made here.

[0038] Specifically, the first receiving member 31, the second receiving member 32 and the third receiving member 33 are all sheet metal structures, and are all integrally formed. Since sheet metal materials are easy to deform, this property makes the sheet metal structure highly flexible and plastic, so that the processing efficiency of the structure processing in the present application can be improved. At the same time, the sheet metal material is usually a metal sheet, so the sheet metal structure has the characteristic of being light in weight, which can reduce the overall weight of the receiving assembly 30.

[0039] At the same time, the one-piece processing can save the production time and processing cost of the receiving component 30, so that the batch production of the receiving component 30 can be completed quickly. In addition, the one-piece molding can ensure that the processed receiving component 30 has the advantages of high precision, high strength, and beautiful appearance, thereby reducing the processing error of the component and improving the overall quality of the receiving component 30.

[0040] Furthermore, the second annular structure and the third annular structure are both coaxially arranged with the first annular structure. This arrangement can ensure the strength of the first annular structure, the second annular structure and the third annular structure after being connected, which is conducive to extending the service life of the receiving assembly 30.

[0041] Specifically, the receiving assembly 30 further includes a connecting member 34, and the first receiving member 31 and the second receiving member 32, as well as the second receiving member 32 and the third receiving member 33 are fixedly connected by the connecting member 34. In the present application, the connecting member 34 is a sheet metal member, which can not only meet the connection requirements between the first receiving member 31 and the second receiving member 32, as well as the second receiving member 32 and the third receiving member 33, but also reduce the production cost of the assembly due to the low cost of the sheet metal member.

[0042] In the present application, the connecting member 34 is connected to the above structure by welding, which can improve the connection strength between the structures and maximize the service life of the receiving assembly 30.

[0043] Further, the thickness of the thermal expansion member 20 is H, 0.6mm≤H≤2mm. When H>2mm, the thickness of the thermal expansion member 20 is too large, which will increase the cost of use, and is not conducive to the mass production of components. When H<0.6mm, the thickness of the thermal expansion member 20 is too small, and the thermal expansion member 20 cannot completely block the air inlet side 12 and the air outlet side 13 when absorbing heat, which is not conducive to preventing the battery pack from spreading heat. Therefore, 0.6mm≤H≤2mm can not only facilitate the mass production of components, but also ensure that the thermal expansion member 20 can block the air inlet side 12 and the air outlet side 13 when absorbing heat, which is conducive to preventing the battery pack from spreading heat. For example, H can be set to a value such as 0.6mm, 1mm or 2mm. The thickness of the thermal expansion member 20 can be set according to the actual use environment of the battery box, and is not specifically limited here.

[0044] Specifically, a connecting hole 35 is provided on the first receiving member 31, the axis of the connecting hole 35 is perpendicular to the axis of the first annular structure, and the first receiving assembly 30 is fixedly connected to the housing 10 through the connecting hole 35. In the present application, a threaded column is provided on the inner wall of the housing 10, and the connecting hole 35 and the threaded column are connected to each other to fix the first receiving member 31 to the housing 10. The above structure is simple and easy to process, so it can further reduce the production cost of the battery case.

[0045] Further, the housing 10 includes an upper cover 14 and a bottom plate 15, and a receiving cavity 11 is formed between the upper cover 14 and the bottom plate 15. The receiving assembly 30 is fixedly connected to the upper cover 14 and / or the bottom plate 15 through a connecting hole 35. In the present application, the receiving assembly 30 is fixedly connected to the upper cover 14. Of course, in other embodiments of the present application, the receiving assembly 30 can also be configured to be fixedly connected to the bottom plate 15, or the receiving assembly 30 can be fixedly connected to both the upper cover 14 and the bottom plate 15. The specific configuration should be selected according to the use environment of the battery box, as long as it can meet the use requirements of the battery box.

[0046] In the second aspect, an embodiment of the utility model provides a battery pack, which includes: the above-mentioned battery case; a DC converter 40, which is arranged in the accommodating cavity 11 of the battery case; a heat sink 50, which is arranged on the air inlet side 12 of the battery case; and a battery module 60, which is arranged in the accommodating cavity 11 of the battery case with a spacing from the DC converter 40.

[0047] By applying the technical solution of the utility model, a thermal expansion member 20 is arranged inside the battery case, and a thermal expansion member 20 is arranged near the air inlet side 12 and near the air outlet side 13. When thermal runaway occurs inside the accommodating cavity 11, the thermal expansion member 20 absorbs part of the heat and expands to block the air inlet side 12 and the air outlet side 13 to prevent outside air from entering the accommodating cavity 11. At the same time, it can also prevent the hot air inside the accommodating cavity 11 from flowing to other positions, thereby preventing heat from spreading inside the battery pack. This can protect other components and improve the safety of the battery pack when in use.

[0048] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0050] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0053] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery box, characterized in that: The battery box comprises: A shell having a receiving cavity and an air inlet side and an air outlet side connected to the receiving cavity; A thermal expansion component is arranged in the accommodating cavity. The thermal expansion component is arranged near the air inlet side and near the air outlet side. When thermal runaway occurs inside the accommodating cavity, the thermal expansion component is used to absorb the heat in the accommodating cavity and expand to block the air inlet side and the air outlet side.

2. The battery box according to claim 1, characterized in that: The battery box also includes a receiving component, which is arranged in the accommodating cavity, is arranged near the air inlet side and / or near the air outlet side, and the thermal expansion member is arranged on the receiving component.

3. The battery box according to claim 2, characterized in that: The receiving assembly includes a first receiving member, which has a plurality of first bending sections connected in sequence. The plurality of first bending sections are enclosed to form a first annular structure, and the thermal expansion member is provided on at least the inner side wall and the outer side wall of the first annular structure.

4. The battery box according to claim 3, characterized in that: The receiving component also includes: A second receiving member has a plurality of second bending segments connected in sequence, wherein the plurality of second bending segments are enclosed to form a second annular structure, wherein the circumference of the second annular structure is smaller than the circumference of the first annular structure, and the heat expansion member is provided on at least the inner side wall and the outer side wall of the second annular structure; and / or A third receiving member, comprising a plurality of third bending segments connected in sequence, wherein the plurality of third bending segments are enclosed to form a third annular structure, wherein the circumference of the third annular structure is smaller than the circumference of the second annular structure, and the thermal expansion member is provided on at least the inner side wall and the outer side wall of the third annular structure; Wherein, the first receiving member is disposed on the outer periphery of the second receiving member along the outer side wall of the second receiving member, and the second receiving member is disposed on the outer periphery of the third receiving member along the outer side wall of the third receiving member.

5. The battery box according to claim 4, characterized in that: The second annular structure and the third annular structure are both coaxially arranged with the first annular structure.

6. The battery box according to claim 4, characterized in that: The receiving assembly further includes a connecting member, and the first receiving member and the second receiving member, as well as the second receiving member and the third receiving member are fixedly connected by the connecting member.

7. The battery case according to any one of claims 2 to 6, characterized in that: The thickness of the thermal expansion member is H, 0.6 mm ≤ H ≤ 2 mm.

8. The battery box according to claim 3, characterized in that: The first receiving member is provided with a connecting hole, the axis of the connecting hole is perpendicular to the axis of the first annular structure, and the first receiving component is fixedly connected to the shell through the connecting hole.

9. The battery case according to claim 8, characterized in that: The shell comprises an upper cover and a bottom plate, the accommodating cavity is formed between the upper cover and the bottom plate, and the receiving assembly is fixedly connected to the upper cover and / or the bottom plate through the connecting hole.

10. A battery pack, characterized in that: The battery pack comprises: The battery box according to any one of claims 1 to 9; A DC converter is arranged in the accommodating cavity of the battery box; A heat sink, arranged on the air inlet side of the battery box; The battery module is arranged in the accommodating cavity of the battery box at a distance from the DC converter.

Images