Battery box body assembly and battery pack

Abstract

The utility model relates to the technical field of new energy batteries, and discloses a battery box body assembly and a battery pack, the battery box body assembly is high in structural strength and good in connection reliability, and the sealing effect of a sealing element can be ensured. The battery box body assembly comprises a frame, a heat exchange plate and a bottom protection plate which are sequentially connected, the frame is arranged on the edge, away from the side face of the bottom protection plate, of the heat exchange plate in a surrounding mode, the bottom protection plate is arranged close to the side face, away from the frame, of the heat exchange plate, and the frame, the heat exchange plate and the bottom protection plate are connected through a first connecting piece in a riveting mode. The boss structure is arranged between the heat exchange plate and the bottom protection plate, a sealing piece is further arranged between the heat exchange plate and the bottom protection plate, and the ratio range of the height of the boss structure in the axial direction of the first connecting piece to the uncompressed height of the sealing piece is [0.3, 0.7].

Description

Technical Field

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

[0002] With the continuous development of new energy technology, new energy batteries, as an environmentally friendly energy storage and release device, have been widely used in energy storage power systems such as hydropower, thermal, wind and solar power stations, as well as power tools, electric bicycles, electric motorcycles, electric vehicles, military equipment, aerospace and many other technical fields.

[0003] The battery box assembly of the existing battery pack includes a frame, a heat exchange plate (or cold plate) and a bottom guard plate. The frame, heat exchange plate and bottom guard plate are installed and connected by ordinary bolts. This connection structure has poor reliability. In addition, since a sealing gasket is provided between the heat exchange plate and the bottom guard plate, the method of connecting the bottom guard plate, heat exchange plate and frame by ordinary bolts can easily cause the sealing gasket to collapse excessively, resulting in sealing failure. Utility Model Content

[0004] In view of this, the utility model provides a battery box assembly and a battery pack to solve the problem that the connection structure of the existing battery box assembly has poor reliability and easily leads to sealing failure between the heat exchange plate and the bottom guard plate.

[0005] In a first aspect, the utility model provides a battery box assembly, comprising a frame, a heat exchange plate and a bottom guard plate connected in sequence, the frame being arranged around the edge of the heat exchange plate away from the side of the bottom guard plate, the bottom guard plate being arranged close to the side of the heat exchange plate away from the frame, the frame, the heat exchange plate and the bottom guard plate being connected by riveting through a first connecting member, the first connecting member having a boss structure, the boss structure being arranged between the heat exchange plate and the bottom guard plate, a seal being further arranged between the heat exchange plate and the bottom guard plate, the ratio of the height of the boss structure along the axial direction of the first connecting member to the uncompressed height of the seal being in the range of [0.3, 0.7].

[0006] Beneficial effect: In the battery box assembly of the utility model, the frame, the heat exchange plate and the bottom guard plate are connected by riveting through the first connecting member. Compared with the existing connection method by ordinary bolts, the connection strength and reliability of the battery box assembly structure of the utility model are significantly enhanced. In addition, since the first connecting member has a boss structure, the boss structure is arranged between the heat exchange plate and the bottom guard plate, and the ratio of the height of the boss structure along the axial direction of the first connecting member to the uncompressed height of the seal is in the range of [0.3, 0.7]. During the riveting connection process, when the heat exchange plate and the bottom guard plate abut against the boss structure, the seal is compressed by the heat exchange plate and the bottom guard plate, and the spacing between the heat exchange plate and the bottom guard plate is equal to the height of the boss structure along the axial direction of the first connecting member, that is, the height of the boss structure along the axial direction of the first connecting member is equal to the height of the seal after compression. If the height of the boss structure along the axial direction of the first connecting member is too small, the seal will be crushed, resulting in sealing failure. If the height of the boss structure along the axial direction of the first connecting member is too large, the seal will be less compressed, which is also easy to cause sealing failure. The utility model limits the ratio of the height of the boss structure along the axial direction of the first connecting member to the uncompressed height of the seal to [0.3, 0.7], so that the seal can be appropriately compressed and can maintain an effective sealing state, thereby effectively preventing sealing failure caused by excessive crushing of the seal or sealing failure caused by small compression of the seal, stabilizing the sealing effect of the seal and improving the sealing reliability.

[0007] In a second aspect, the utility model also includes a battery pack, including a battery cell and a battery box assembly as described above, wherein the battery cell is disposed in the battery box assembly.

[0008] Because the battery of the present invention includes the battery box assembly of the present invention, and has the same beneficial effects as the battery box assembly, they will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 It is a three-dimensional schematic diagram of the battery box assembly of the utility model;

[0011] Figure 2 This is a bottom view of the battery box assembly of the utility model;

[0012] Figure 3 It is an enlarged schematic diagram of the battery box assembly (partial structure) of the utility model;

[0013] Figure 4 It is a schematic diagram of the first connecting member in the battery box assembly of the utility model;

[0014] Figure 5 It is an exploded schematic diagram of the first connecting member in the battery box assembly of the utility model;

[0015] Figure 6 It is a schematic diagram of the second connecting member in the battery box assembly of the utility model;

[0016] Figure 7 It is a schematic diagram of the first connection hole, the second connection hole and the third connection hole in the battery box assembly of the utility model.

[0017] Description of reference numerals:

[0018] 1. frame; 101. first connection hole;

[0019] 2. heat exchange plate; 201. upper plate of heat exchange plate; 2011. second connection hole; 202. lower plate of heat exchange plate; 2021. third connection hole;

[0020] 3. Bottom guard plate;

[0021] 4. First connecting member; 401. Rivet nut; 402. Screw; 403. First boss; 404. Second boss; 405. First connecting member abutment platform;

[0022] 5. Second connecting member; 501. Second connecting member abutment platform. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment 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.

[0024] Combine the following Figures 1 to 7 , describing embodiments of the battery box assembly and battery pack of the utility model.

[0025] According to an embodiment of the utility model, on the one hand, a battery box assembly is provided, comprising a frame 1, a heat exchange plate 2 and a bottom guard plate 3 connected in sequence, the frame 1 is arranged around the edge of the side of the heat exchange plate 2 away from the bottom guard plate 3, the bottom guard plate 3 is arranged close to the side of the heat exchange plate 2 away from the frame 1, the frame 1, the heat exchange plate 2 and the bottom guard plate 3 are connected by riveting through a first connecting member 4, the first connecting member 4 has a boss structure, the boss structure is arranged between the heat exchange plate 2 and the bottom guard plate 3, a sealing member is also arranged between the heat exchange plate 2 and the bottom guard plate 3, and the ratio of the height of the boss structure along the axial direction of the first connecting member 4 to the uncompressed height of the seal is in the range of [0.3, 0.7].

[0026] In this battery box assembly, the frame 1, the heat exchange plate 2 and the bottom guard plate 3 are connected by riveting through the first connecting member 4, so that the connection strength and reliability of the battery box assembly are significantly enhanced. In addition, since the first connecting member 4 has a boss structure, the boss structure is arranged between the heat exchange plate 2 and the bottom guard plate 3, and the ratio of the height of the boss structure along the axial direction of the first connecting member to the uncompressed height of the seal is in the range of [0.3, 0.7]. During the riveting connection process, when the heat exchange plate 2 and the bottom guard plate 3 abut against the boss structure, the seal is compressed by the heat exchange plate 2 and the bottom guard plate 3, and the spacing between the heat exchange plate 2 and the bottom guard plate 3 is equal to the height of the boss structure along the axial direction of the first connecting member 4, that is, the height of the boss structure along the axial direction of the first connecting member 4 is equal to the height of the seal after compression. If the height of the boss structure along the axial direction of the first connecting member 4 is too small, the seal will be crushed, resulting in sealing failure. If the height of the boss structure along the axial direction of the first connecting member 4 is too large, the seal will be less compressed, which is also easy to cause sealing failure. By limiting the ratio of the height of the boss structure along the axial direction of the first connecting member 4 to the uncompressed height of the seal to [0.3, 0.7], the seal can be appropriately compressed and can maintain an effective sealing state, thereby effectively preventing sealing failure caused by excessive crushing of the seal or sealing failure caused by small compression of the seal, thereby stabilizing the sealing effect of the seal and improving the sealing reliability.

[0027] The frame 1, the heat exchange plate 2 and the bottom guard plate 3 are connected in sequence. Specifically, the bottom guard plate 3 is arranged at the bottom of the battery box assembly, on which the heat exchange plate 2 is arranged. A cooling channel is formed in the heat exchange plate 2, and the cooling channel is suitable for passing a cooling medium. The side of the heat exchange plate 2 away from the bottom guard plate 3 is a support surface for setting the battery cell, and the cooling medium is used to cool the battery cell to ensure its working performance. The frame 1 is arranged around the edge of the side of the heat exchange plate 2 away from the bottom guard plate 3, and the frame 1 protrudes from the side of the heat exchange plate 2 away from the bottom guard plate 3. The frame 1 is arranged around the heat exchange plate 2 and forms a mounting groove structure together with the heat exchange plate 2. The battery cells and other electrical components of the battery pack are arranged in the mounting groove.

[0028] like Figure 1 and Figure 2As shown, in this embodiment, the heat exchange plate 2 and the bottom guard plate 3 are both rectangular plate structures, and the frame 1 is a rectangular frame structure surrounding the side of the heat exchange plate 2 away from the bottom guard plate 3.

[0029] In order to enhance the sealing between the heat exchange plate 2 and the bottom guard plate 3, a seal is arranged between the heat exchange plate 2 and the bottom guard plate 3. The seal has a first sealing surface and a second sealing surface. After assembly, the seal will be squeezed by the heat exchange plate 2 and the bottom guard plate 3 to produce a certain compression deformation. At this time, the first sealing surface of the seal abuts against the heat exchange plate 2, and the second sealing surface of the seal abuts against the bottom guard plate 3.

[0030] In this embodiment, the sealing member is a sealing pad, and the specific setting position, size and shape of the sealing member are the same as those in the prior art, which will not be described in detail.

[0031] It should be noted that after the seal is compressed and deformed by the extrusion of the heat exchange plate 2 and the bottom guard plate 3, the distance between the first sealing surface and the second sealing surface in the seal will be reduced. If the extrusion is excessive and a transitional crush occurs, the seal will fail. If the extrusion is insufficient and the compression of the seal is small, the seal will also fail, that is, the heat exchange plate 2 and the bottom guard plate 3 cannot be sealed.

[0032] The ratio of the height of the boss structure along the axial direction of the first connecting member 4 to the uncompressed height of the seal is in the range of [0.3, 0.7]. The uncompressed height of the seal refers to the maximum height of the seal rebounding after being removed (not compressed). In this embodiment, the ratio of the height of the boss structure along the axial direction of the first connecting member 4 to the uncompressed height of the seal is 0.5. Under this ratio, the seal can be properly compressed after installation, that is, it will not be excessively crushed or under-compressed, and the seal can maintain an effective sealing state, so that the sealing effect of the seal is stable and reliable.

[0033] Of course, in other embodiments, according to different design requirements, the ratio of the height of the boss structure along the axial direction of the first connecting member 4 to the uncompressed height of the seal can also be 0.3, 0.4, 0.65, 0.7, etc.

[0034] The frame 1, the heat exchange plate 2 and the bottom guard plate 3 are connected by riveting through the first connecting member 4. The riveting connection has a high connection strength and can withstand large external tensile forces, which can greatly improve the connection strength and reliability between the frame 1, the heat exchange plate 2 and the bottom guard plate 3.

[0035] In this embodiment, the first connecting member 4 includes a rivet nut 401, which is easy to install and has the characteristics of light weight, corrosion resistance, and good sealing, and is suitable for the field of battery technology. In addition, the first connecting member 4 also includes a screw 402, which cooperates with the rivet nut 401 to achieve rivet connection between the frame 1, the heat exchange plate 2, and the bottom guard plate 3.

[0036] After the installation is completed, a portion of the first connecting member 4 is exposed outside the bottom guard plate 3. Figure 3 As shown, the rest of the first connector 4 is placed in the battery box assembly. In order to improve the connection strength of the frame 1, the heat exchange plate 2 and the bottom guard plate 3, a plurality of first connectors 4 are provided, and the plurality of first connectors 4 are arranged at intervals along the edge of the battery box assembly. Preferably, the plurality of first connectors 4 are evenly spaced along the edge of the battery box assembly. The specific number of first connectors 4 is selected and set according to the size of the battery box assembly and the connection strength requirements.

[0037] like Figure 4 and Figure 5 As shown, the first connecting member 4 includes a first rod-shaped portion and a boss structure, the first rod-shaped portion is arranged on the rivet nut 401, and the first rod-shaped portion is arranged along the axial direction of the first connecting member 4. During assembly, the first rod-shaped portion passes through the heat exchange plate 2 and the frame 1.

[0038] like Figure 3 As shown, after assembly, the boss structure is arranged between the heat exchange plate 2 and the bottom guard plate 3, and the height of the boss structure along the axial direction of the first connecting member 4 is equal to the sealing height of the seal after compression. When the frame 1, the heat exchange plate 2 and the bottom guard plate 3 are connected by riveting through the first connecting member 4, when the heat exchange plate 2 and the bottom guard plate 3 are continuously approached until the heat exchange plate 2 and the bottom guard plate 3 abut against the boss structure, the distance between the opposite sides of the heat exchange plate 2 and the bottom guard plate 3 is the height of the boss structure along the axial direction of the first connecting member 4, which is equal to the sealing height of the seal after compression. At this time, the seal is squeezed and compressed by the heat exchange plate 2 and the bottom guard plate 3 and is in a state of maintaining effective sealing.

[0039] Furthermore, if Figure 3 As shown, the boss structure includes a first boss 403 and a second boss 404, and the first boss 403 and the second boss 404 are arranged in sequence along the axial direction of the first connecting member 4, and the first boss 403 and the second boss 404 are both arranged on the rivet nut 401, and the sum of the heights of the first boss 403 and the second boss 404 along the axial direction of the first connecting member 4 is the height of the boss structure along the axial direction of the first connecting member 4.

[0040] Specifically, the first boss 403 is arranged close to the heat exchange plate 2, and the second boss 404 is arranged close to the bottom guard plate 3. The side of the first boss 403 away from the second boss 404 abuts against the heat exchange plate 2, and the side of the second boss 404 away from the first boss 403 abuts against the bottom guard plate 3. In addition, the outer diameter of the first boss 403 is larger than the outer diameter of the second boss 404, so as to save manufacturing costs and facilitate installation operations.

[0041] Furthermore, the height range of the boss structure along the axial direction of the first connector 4 is [2mm, 8mm]. In this embodiment, the height of the boss structure along the axial direction of the first connector 4 is 6mm, which can ensure that the seal is properly compressed to ensure the sealing effect of the seal.

[0042] In other embodiments, the height of the boss structure along the axial direction of the first connecting member 4 may also be 2 mm, 3 mm, 5 mm, 8 mm, etc.

[0043] In addition, in order to avoid the influence of the riveting process of the first connecting member 4 on the seal, the seal and the boss structure should be set at a certain distance. The distance refers to the distance between the seal and the boss structure in the direction parallel to the plane where the heat exchange plate 2 and / or the bottom guard plate 3 are located, so that the two do not affect each other, thereby improving the structural reliability.

[0044] The first connector 4 further includes a first connector abutment platform 405, which is specifically arranged on the screw rod 402, and the first boss 403, the second boss 404 and the first connector abutment platform 405 are arranged in sequence along the axial direction of the first connector 4. After assembly, the first connector abutment platform 405 is exposed from the bottom guard plate 3, and the first connector abutment platform 405 abuts against the bottom guard plate 3 toward the side of the bottom guard plate 3, and the second boss 404 abuts against the bottom guard plate 3 toward the side of the bottom guard plate 3, so as to enhance the connection strength.

[0045] In this embodiment, the outer diameter of the first connecting member abutment 405 is larger than that of the second boss 404 and smaller than that of the first boss 403 to facilitate manufacturing and installation.

[0046] Furthermore, the heat exchange plate 2 includes a heat exchange plate upper plate 201 and a heat exchange plate lower plate 202. The heat exchange plate upper plate 201 is arranged closer to the frame 1 than the heat exchange plate lower plate 202, and the heat exchange plate lower plate 202 is arranged closer to the bottom guard plate 3 than the heat exchange plate upper plate 201. The frame 1, the heat exchange plate upper plate 201 and the heat exchange plate lower plate 202 are sequentially formed with a first connecting hole 101, a second connecting hole 2011 and a third connecting hole 2021 suitable for the first connecting member 4 to pass through, and the inner diameters of the first connecting hole 101, the second connecting hole 2011 and the third connecting hole 2021 are different.

[0047] The heat exchange plate 2 includes a heat exchange plate upper plate 201 and a heat exchange plate lower plate 202. The heat exchange plate upper plate 201 and the heat exchange plate lower plate 202 are connected to each other to form the heat exchange plate 2 and jointly form a cooling channel suitable for passing a cooling medium. The frame 1, the heat exchange plate upper plate 201 and the heat exchange plate lower plate 202 are sequentially formed with a first connection hole 101, a second connection hole 2011 and a third connection hole 2021 suitable for the first connection member 4 to pass through. The first connection hole 101, the second connection hole 2011 and the third connection hole 2021 are all through holes. The first connection hole 101, the second connection hole 2011 and the third connection hole 2021 are suitable for the first rod-shaped part of the first connection member 4 to pass through, so as to realize the installation of the first connection member 4.

[0048] In order to improve the manufacturing and installation efficiency, the inner diameters of the first connection hole 101, the second connection hole 2011 and the third connection hole 2021 are set to be different, and the above setting can absorb the manufacturing tolerance and facilitate the installation of the first connection member 4. It can be understood that the outer diameters of the first boss 403, the second boss 404 and the first connection member abutment platform 405 are all larger than the inner diameters of the first connection hole 101, the second connection hole 2011 and the third connection hole 2021 to limit the setting position of the first connection member 4.

[0049] Furthermore, the inner diameters of the first connection hole 101 , the second connection hole 2011 and the third connection hole 2021 increase sequentially.

[0050] like Figure 7 As shown, the inner diameters of the first connection hole 101, the second connection hole 2011 and the third connection hole 2021 increase in sequence, and the first connection hole 101, the second connection hole 2011 and the third connection hole 2021 form a stepped structure. During installation, the first rod-shaped portion of the first connection member 4 passes through the third connection hole 2021, the second connection hole 2011 and the first connection hole 101 in sequence, and the first rod-shaped portion of the first connection member 4 does not need to be precisely aligned with the third connection hole 2021, the second connection hole 2011 and the first connection hole 101, and the installation of the first connection member 4 can be achieved, thereby simplifying the difficulty of the installation operation and improving the installation efficiency. In addition, since the inner diameters of the first connection hole 101, the second connection hole 2011 and the third connection hole 2021 increase in sequence, it is possible to absorb the processing tolerance, improve the structural matching degree, further reduce the processing difficulty and improve the installation efficiency.

[0051] Further, the difference between the inner diameters of the first connection hole 101 and the second connection hole 2011 is greater than or equal to 2 mm, and the difference between the inner diameters of the second connection hole 2011 and the third connection hole 2021 is greater than or equal to 2 mm. The first connection hole 101, the second connection hole 2011 and the third connection hole 2021 are arranged adjacent to each other in sequence, and the difference between the inner diameters of adjacent connection holes is greater than or equal to 2 mm, so as to improve the tolerance absorption effect.

[0052] In this embodiment, the difference between the inner diameters of the first connecting hole 101 and the second connecting hole 2011 is equal to 2 mm, and the difference between the inner diameters of the second connecting hole 2011 and the third connecting hole 2021 is also equal to 2 mm, that is, the inner diameter of the second connecting hole 2011 is 2 mm larger than the inner diameter of the first connecting hole 101, and the inner diameter of the third connecting hole 2021 is 2 mm larger than the inner diameter of the second connecting hole 2011, so as to facilitate processing and manufacturing, and at the same time effectively absorb processing tolerances and improve structural fit.

[0053] In other embodiments, the difference between the inner diameters of the first connection hole 101 and the second connection hole 2011, and the difference between the inner diameters of the second connection hole 2011 and the third connection hole 2021 may be the same or different. For example, the difference between the inner diameters of the first connection hole 101 and the second connection hole 2011 is 3.5 mm, and the difference between the inner diameters of the second connection hole 2011 and the third connection hole 2021 is also 3.5 mm; or, for example, the difference between the inner diameters of the first connection hole 101 and the second connection hole 2011 is 3 mm, and the difference between the inner diameters of the second connection hole 2011 and the third connection hole 2021 is 4 mm; or, for example, the difference between the inner diameters of the first connection hole 101 and the second connection hole 2011 is 2.8 mm, and the difference between the inner diameters of the second connection hole 2011 and the third connection hole 2021 is 2.5 mm.

[0054] Furthermore, the frame 1 and the heat exchange plate 2 are riveted together via a second connecting member 5 .

[0055] In order to further increase the connection strength and structural stability, and facilitate the installation of the frame 1, the heat exchange plate 2 and the bottom guard plate 3, the frame 1 and the heat exchange plate 2 are also riveted together by the second connecting piece 5. Of course, corresponding assembly holes suitable for the second connecting piece 5 to pass through are formed on the frame 1 and the heat exchange plate 2. During installation, the frame 1 and the heat exchange plate 2 can be first connected by the second connecting piece 5, and then the frame 1, the heat exchange plate 2 and the bottom guard plate 3 can be riveted together by the first connecting piece 4, so that the frame 1, the heat exchange plate 2 and the bottom guard plate 3 are connected in steps, which is convenient for the installation operation and can further enhance the connection strength and reliability between the frame 1, the heat exchange plate 2 and the bottom guard plate 3.

[0056] Furthermore, the second connecting member 5 comprises a blind rivet. Figure 6As shown, the second connector 5 includes a second rod-shaped portion and a second connector abutment platform 501, and the second rod-shaped portion is arranged along the axial direction of the second connector 5. During assembly, the second rod-shaped portion passes through the heat exchange plate 2 and the frame 1. The second connector abutment platform 501 is arranged at one end of the second rod-shaped portion. After assembly, the second connector abutment platform 501 is placed on the side of the heat exchange plate 2 facing the bottom guard plate 3, that is, the second connector abutment platform 501 is arranged between the heat exchange plate 2 and the bottom guard plate 3, and the second connector abutment platform 501 abuts against the heat exchange plate 2 on the side facing the heat exchange plate 2 to strengthen the connection strength between the heat exchange plate 2 and the bottom guard plate 3. It can be understood that the outer diameter of the second connector abutment platform 501 is greater than the inner diameter of the assembly holes on the frame 1 and the heat exchange plate 2.

[0057] In order to improve the connection strength between the frame 1 and the heat exchange plate 2, a plurality of second connectors 5 are provided, and the plurality of second connectors 5 are arranged at intervals along the edge of the battery box assembly. Preferably, the plurality of second connectors 5 are evenly spaced along the edge of the battery box assembly. The specific number of second connectors 5 is selected and set according to the size of the battery box assembly and the connection strength requirements.

[0058] The first connector 4 and the second connector 5 are arranged in parallel in the axial direction, and in order to make the connection strength at the edge of the battery box assembly more balanced and consistent, a plurality of first connectors 4 and second connectors 5 are provided, and the first connectors 4 and second connectors 5 are alternately and evenly spaced. Preferably, the spacing between each first connector 4 and the adjacent second connector 5 is uniform.

[0059] The following describes the installation process of the battery box assembly of this embodiment in conjunction with the accompanying drawings:

[0060] First, use the second connecting member 5 to rivet and install the frame 1 and the heat exchange plate 2, and pass the second rod-shaped part of the second connecting member 5 through the assembly hole on the heat exchange plate 2 and the assembly hole on the frame 1 in sequence, so that the second connecting member abutment platform 501 abuts against the side of the heat exchange plate 2 away from the frame 1. In this process, corresponding installation tools can be used for operation, which is not repeated here.

[0061] Afterwards, the first rod-shaped part of the rivet nut 401 is passed through the third connecting hole 2021 and the second connecting hole 2011 of the heat exchange plate 2 and the first connecting hole 101 of the frame 1 in sequence, and then the bottom guard plate 3 is brought close to the heat exchange plate 2, and the screw 402 is passed through the bottom guard plate 3 and then riveted with the rivet nut. In this process, corresponding installation tools can be used for operation, which will not be repeated here.

[0062] At this point, the installation of the battery box assembly is completed.

[0063] This embodiment also provides a battery pack, including a battery cell and the battery case assembly as described above, wherein the battery cell is disposed in the battery case assembly.

[0064] The number of battery cells is set as needed, and the battery cells are suitable for being installed in the installation grooves formed by the battery box assembly. Of course, the battery pack of this embodiment also includes other structures and electrical components that existing battery packs have, and has the functions of existing battery packs. Since this embodiment does not involve them, they will not be repeated here.

[0065] The battery pack of this embodiment has good structural strength, strong connection reliability and good sealing effect of the battery box assembly, so that the battery pack can operate stably and reliably, has a long service life and is not easy to damage.

[0066] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A battery box assembly, characterized in that: The invention comprises a frame (1), a heat exchange plate (2) and a bottom guard plate (3) which are connected in sequence, wherein the frame (1) is arranged around the edge of the side of the heat exchange plate (2) away from the bottom guard plate (3), and the bottom guard plate (3) is arranged close to the side of the heat exchange plate (2) away from the frame (1). The frame (1), the heat exchange plate (2) and the bottom guard plate (3) are connected by riveting via a first connecting member (4), wherein the first connecting member (4) has a boss structure, and the boss structure is arranged between the heat exchange plate (2) and the bottom guard plate (3). A sealing member is also arranged between the heat exchange plate (2) and the bottom guard plate (3), and the ratio of the height of the boss structure along the axial direction of the first connecting member (4) to the uncompressed height of the sealing member is in the range of [0.3, 0.7].

2. The battery box assembly according to claim 1, characterized in that: The height range of the boss structure along the axial direction of the first connecting member (4) is [2mm, 8mm].

3. The battery box assembly according to claim 1, characterized in that: The heat exchange plate (2) comprises an upper plate (201) of the heat exchange plate and a lower plate (202) of the heat exchange plate. The upper plate (201) of the heat exchange plate is arranged closer to the frame (1) than the lower plate (202) of the heat exchange plate. The lower plate (202) of the heat exchange plate is arranged closer to the bottom guard plate (3) than the upper plate (201) of the heat exchange plate. The frame (1), the upper plate (201) of the heat exchange plate and the lower plate (202) of the heat exchange plate are respectively formed with a first connecting hole (101), a second connecting hole (2011) and a third connecting hole (2021) suitable for the first connecting member (4) to pass through. The inner diameters of the first connecting hole (101), the second connecting hole (2011) and the third connecting hole (2021) are different.

4. The battery box assembly according to claim 3, characterized in that: The inner diameters of the first connecting hole (101), the second connecting hole (2011) and the third connecting hole (2021) increase sequentially.

5. The battery box assembly according to claim 3, characterized in that: The difference between the inner diameters of the first connecting hole (101) and the second connecting hole (2011) is greater than or equal to 2 mm, and the difference between the inner diameters of the second connecting hole (2011) and the third connecting hole (2021) is greater than or equal to 2 mm.

6. The battery box assembly according to claim 1, characterized in that: The first connecting member (4) comprises a rivet nut (401).

7. The battery box assembly according to any one of claims 1 to 6, characterized in that: The frame (1) and the heat exchange plate (2) are also riveted together via a second connecting member (5).

8. The battery box assembly according to claim 7, characterized in that: A plurality of the first connecting members (4) and the second connecting members (5) are provided, and the first connecting members (4) and the second connecting members (5) are alternately and evenly spaced.

9. The battery box assembly according to claim 7, characterized in that: The second connecting member (5) comprises a blind rivet.

10. A battery pack, characterized in that: It comprises a battery cell and a battery case assembly as described in any one of claims 1 to 9, wherein the battery cell is arranged in the battery case assembly.

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