Battery pack accommodating box and battery pack

Abstract

The application relates to the technical field of battery packs, and discloses a battery pack containing box and a battery pack, which comprise a box body, an extension part, a sealing connecting part and a cover plate. One side of the box body is open, specifically, the top surface of the box body is open. The extension part is arranged on the box body and located at the circumferential side of the opening. The extension part extends away from the box body. The extension part is used for providing support for the sealing connecting part. The bottom of a hollow part is arranged on the extension part. The bottom of a solid part is arranged on the top of the hollow part. The top of the solid part is sealingly connected with the cover plate. The battery pack containing box and the battery pack can solve or improve the problem of poor sealing effect of the battery pack.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, specifically to battery pack housings and battery packs. Background Technology

[0002] The battery pack casing and cover are sealed together by a flange. The flange connection surface is usually a flat surface. Setting it to a flat surface can improve the sealing effect, thereby improving the waterproof and dustproof effect.

[0003] However, due to the need to coordinate with the installation of other parts and the space constraints of the vehicle, the flange on the battery pack needs to be designed in an irregular shape. In order to facilitate the processing of irregular shapes, related technologies have set a beam on the flange for connecting the cover plate. The beam is welded from multiple plates and has an internal cavity. Therefore, the overall strength of the beam is low. It is simple to operate and easy to shape when extruded by equipment. However, the uneven grinding at the weld seams between the plates can easily cause leakage problems and reduce the sealing effect. Utility Model Content

[0004] In view of this, this application provides a battery pack housing and a battery pack to solve or improve the problem of poor battery pack sealing performance.

[0005] This application provides a battery pack housing, comprising:

[0006] The housing has an opening on one side;

[0007] An extension portion is provided on the housing and located around the opening, the extension portion extending away from the housing;

[0008] A sealing connection portion, the sealing connection portion comprising a hollow portion connected to the extension portion and a solid portion connected to the hollow portion;

[0009] A cover plate, which is sealed to the solid part.

[0010] In this embodiment, an opening is provided on one side of the housing, and the battery cell is installed in the housing through the opening. The opening is sealed by a cover plate. An extension extends from the periphery of the opening, and a sealing connection is connected to the extension for easy connection with the cover plate. The sealing connection includes a hollow part and a solid part. The hollow part is connected to the extension, and an inner cavity is provided inside the hollow part to accommodate wires and components. Furthermore, the hollow part has low stress, which can reduce the overall stress of the sealing connection and facilitate extrusion molding. The solid part is sealed to the cover plate. Compared with related technologies, the solid part has no welding gaps, so the sealing effect with the cover plate is better.

[0011] In one optional embodiment, along the first direction, a first inclined surface and a second inclined surface are provided on both sides of the solid portion, and along the second direction, the distance between the first inclined surface and the second inclined surface gradually decreases;

[0012] Wherein, the first direction is the length direction of the solid part; the second direction is the direction from the bottom to the top of the solid part.

[0013] In one optional embodiment, the solid portion is provided with a plurality of blind holes;

[0014] It also includes a plurality of first connecting components, each first connecting component including a connecting seat and a connecting member. The plurality of connecting seats are detachably connected to the plurality of blind holes in a one-to-one correspondence. The plurality of connecting members are detachably connected to the plurality of connecting seats in a one-to-one correspondence. The plurality of connecting members seal the cover plate to the solid part.

[0015] In an optional embodiment, a first sealing strip is further included. The first sealing strip is disposed between the cover plate and the solid part. The first sealing strip has multiple through holes corresponding to the multiple blind holes. The cover plate has multiple through holes corresponding to the multiple blind holes. The connector passes through the through holes and the through holes in sequence and is connected to the connector seat.

[0016] In one alternative embodiment, a connecting plate extends from the edge of the cover plate, the connecting plate being arranged corresponding to the top surface of the solid portion along the second direction, and the perforation being provided on the connecting plate.

[0017] In one alternative embodiment, the thickness of the connecting plate is 3 mm to 5 mm.

[0018] In one optional embodiment, the hollow portion includes a plurality of plates connected to form a beam, a cavity is formed within the beam, the bottom surface of the beam along the second direction is connected to the extension portion, and the top surface of the beam along the second direction is connected to the solid portion.

[0019] In one alternative embodiment, the hollow portion and the solid portion are integrally formed by an aluminum profile extrusion process.

[0020] In one optional embodiment, the system further includes a plurality of second connecting components. The beam body is provided with a plurality of connecting holes communicating with the cavity. The connecting plate is provided with a plurality of through holes corresponding to the plurality of connecting holes. The second connecting components pass through the through holes and the connecting holes to connect the connecting plate to the beam body.

[0021] In one alternative implementation, the second connection component includes:

[0022] A connecting cylinder, wherein a deformation section and a connecting section are sequentially arranged along the direction from the opening to the bottom of the cylinder, the connecting cylinder is located in the cavity and is arranged corresponding to the connecting hole, and the deformation section is adapted to abut against the inner wall of the beam after deformation;

[0023] A connecting rod, the first end of which is provided with an abutment portion adapted to abut against the outer wall of the beam, and the second end of which passes through the through hole and the connecting hole and is connected to the connecting section.

[0024] Secondly, this application also provides a battery pack, comprising:

[0025] The battery pack housing described above;

[0026] At least one battery cell is installed inside the housing. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of a battery pack housing according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of a battery pack housing with the cover removed, according to an embodiment of this application.

[0030] Figure 3 This is a partial structural schematic diagram of a battery pack housing according to an embodiment of this application;

[0031] Figure 4 for Figure 3 A cross-sectional view along the middle AA;

[0032] Figure 5 for Figure 4 A magnified view of part of C;

[0033] Figure 6 for Figure 4 A magnified view of part of D;

[0034] Figure 7 This is a schematic diagram of the structure of a sealing connection part in a battery pack housing according to an embodiment of this application;

[0035] Figure 8 for Figure 7 Top view;

[0036] Figure 9 for Figure 8 Sectional view of BB;

[0037] Figure 10 for Figure 7 The left view.

[0038] Explanation of reference numerals in the attached figures:

[0039] 1. Housing; 2. Extension section; 3. Sealing connection section; 301. Solid section; 3011. First inclined surface; 3012. Second inclined surface; 3013. Blind hole; 302. Hollow section; 3021. Plate; 3022. Cavity; 4. Cover plate; 401. Connecting plate; 5. First connecting assembly; 501. Connecting seat; 502. Connecting piece; 6. First sealing strip; 7. First thread; 8. Second thread; 9. Second connecting assembly; 901. Connecting cylinder; 9011. Deformation section; 9012. Connecting section; 902. Connecting rod; 9021. Abutment section; 10. Third thread; 11. Gasket; 12. Second sealing strip; 13. Sealing ring; X, First direction; Y, Second direction. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; or they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] The battery pack casing and cover are sealed together by a flange. The flange connection surface is usually a flat surface. Setting it to a flat surface can improve the sealing effect, thereby improving the waterproof and dustproof effect.

[0044] However, due to the need to coordinate with the installation of other parts and the space constraints of the vehicle, the flange on the battery pack needs to be designed in an irregular shape. To facilitate the processing of irregular shapes, related technologies have set up a beam on the flange for connecting the cover plate. The beam is welded from multiple plates and has an internal cavity. Therefore, the overall strength of the beam is low. It is simple to operate and easy to shape when extruded by equipment, but the weld seams between the plates are not ground smoothly, which can easily lead to leakage problems and reduce the sealing effect. Another solution is to use a die-cast beam, which does not require welding and prevents leakage problems, but it requires the production of molds, resulting in high costs.

[0045] The following is combined Figures 1 to 10 This describes an embodiment of the present application.

[0046] According to an embodiment of this application, a battery pack housing is provided, comprising: a housing 1, an extension portion 2, a sealing connection portion 3, and a cover plate 4.

[0047] Specifically, such as Figure 1 , Figure 2 and Figure 4 As shown, the box 1 has an opening on one side, specifically an opening on the top surface of the box 1. The extension 2 is disposed on the box 1 and located around the opening, as shown. Figure 2 As shown, it is specifically set on one side of the box body, with the side extension 2 extending away from the box body 1. The extension 2 is used to provide support for the sealing connection 3. The bottom of the hollow part 302 is set on the extension 2, and the bottom of the solid part 301 is set on the top of the hollow part 302. The top of the solid part 301 is sealed and connected to the cover plate 4.

[0048] In this embodiment, such as Figure 1 , Figure 2 and Figure 4As shown, the battery cell is installed in the housing 1 through the opening, which is sealed by the cover plate 4. An extension 2 extends from the periphery of the opening, and a sealing connection 3 is connected to the extension 2 to facilitate the connection between the sealing connection 3 and the cover plate 4. The sealing connection 3 includes a hollow part 302 and a solid part 301. The hollow part 302 is connected to the extension 2, and an inner cavity is provided inside the hollow part 302 to facilitate the accommodation of wires and components. The solid part 301 is sealed to the cover plate 4. Compared with related technologies, the solid part 301 does not have welding gaps, so the sealing effect with the cover plate 4 is better.

[0049] In one embodiment, such as Figure 9 As shown, along the first direction X, a first inclined surface 3011 and a second inclined surface 3012 are provided on both sides of the solid part 301, and along the second direction Y, the distance between the first inclined surface 3011 and the second inclined surface 3012 gradually decreases; wherein, the first direction X is the length direction of the solid part 301; and the second direction Y is the bottom to top direction of the solid part 301.

[0050] In this embodiment, such as Figure 9 As shown, the solid part 301 has a first inclined surface 3011 and a second inclined surface 3012 on both sides. The first inclined surface 3011 and the second inclined surface 3012 are in contact with the cover plate 4, which can increase the contact area and thus improve the sealing effect between the solid part 301 and the cover plate 4.

[0051] Furthermore, the first inclined surface 3011 and the second inclined surface 3012 extend along the second direction Y and approach each other. When they come into contact with the cover plate 4, they can also position the cover plate 4. Specifically, the longitudinal section of the solid part 301 is trapezoidal.

[0052] In one embodiment, such as Figures 3 to 5 As shown, the solid part 301 has multiple blind holes 3013;

[0053] It also includes multiple first connecting components 5, each of which includes a connecting seat 501 and a connecting member 502. The multiple connecting seats 501 are detachably connected to the multiple blind holes 3013 in a one-to-one correspondence. The multiple connecting members 502 are detachably connected to the multiple connecting seats 501 in a one-to-one correspondence. The multiple connecting members 502 seal the cover plate 4 onto the solid part 301.

[0054] In this embodiment, such as Figure 4 and Figure 5 As shown, the connector 501 is connected to the blind hole 3013. When the connector 502 is connected to the connector 501, the cover plate 4 is connected to the connector 501, that is, the cover plate 4 is connected to the solid part 301, which facilitates disassembly.

[0055] Specifically, connector 502 is a bolt.

[0056] In one embodiment, such as Figure 2 as well as Figures 4 to 6 As shown, it also includes a first sealing strip 6, which is disposed between the cover plate 4 and the solid part 301. The first sealing strip 6 has multiple through holes corresponding to multiple blind holes 3013, and the cover plate 4 has multiple through holes corresponding to multiple blind holes 3013. The connector 502 passes through the through holes and through holes in sequence and connects to the connector 501.

[0057] In this embodiment, the first sealing strip 6 is disposed between the cover plate 4 and the solid part 301 to improve the sealing effect between the cover plate 4 and the solid part 301.

[0058] Specifically, such as Figure 5 As shown, a sealing ring 13 is provided on the inner wall of the through hole on the first sealing strip 6. The connector 502 passes through the sealing ring 13. The outer ring of the sealing ring 13 is sealed to the inner wall of the through hole, and the inner ring of the sealing ring 13 is sealed to the connector 502.

[0059] In some embodiments, such as Figure 2 As shown, it also includes a second sealing strip 12, which is disposed on the end face of the opening of the housing 1 and is sealed to the cover plate 4.

[0060] In some embodiments, such as Figure 5 As shown, a first thread 7 is provided in the blind hole 3013, a second thread 8 adapted to the first thread 7 is provided on the outer wall of the connecting seat 501, a threaded hole is provided on the connecting seat 501, and a third thread 10 adapted to the threaded hole is provided on the outer wall of the connecting member 502. Specifically, as shown... Figure 5 As shown, the connecting seat 501 is connected to the blind hole 3013. The first thread 7 and the second thread 8 are adapted to achieve a detachable connection between the connecting seat 501 and the blind hole 3013. The connecting piece 502 is provided with a third thread 10, which can be detachably connected to the threaded hole. The connecting piece 502 passes through the through hole and the through hole and is connected to the connecting seat 501 to fix the cover plate 4, the first sealing strip 6 and the solid part 301.

[0061] In one embodiment, such as Figure 1 , Figure 5 and Figure 9 As shown, a connecting plate 401 extends from the edge of the cover plate 4. The connecting plate 401 and the solid part 301 are arranged corresponding to the top surface along the second direction Y, and perforations are provided on the connecting plate 401.

[0062] In this embodiment, a first sealing strip 6 is sandwiched between the connecting plate 401 and the solid part 301, which can increase the contact area between the cover plate 4 and the solid part 301. The connecting plate 401 provides an installation position for the first connecting component 5, which facilitates the connection between the cover plate 4 and the solid part 301.

[0063] In one embodiment, the thickness of the connecting plate 401 is 3 mm to 5 mm.

[0064] In some embodiments, the thickness of the connecting plate 401 is 3mm, 4mm, or 5mm.

[0065] In one embodiment, such as Figures 7 to 10 As shown, the hollow part 302 includes multiple plates 3021, which are connected to form a beam. A cavity 3022 is formed inside the beam. The bottom surface of the beam along the second direction Y is connected to the extension part 2, and the top surface of the beam along the second direction Y is connected to the solid part 301.

[0066] In one embodiment, the hollow portion 302 and the solid portion 301 are integrally formed by an aluminum profile extrusion process.

[0067] Specifically, in the aluminum profile extrusion process, the first step is to select aluminum alloy cast rods and clean them. According to the size of the product to be prepared, the aluminum alloy cast rods are sawn to the required length, ensuring that the end face is flat. Then, the aluminum alloy cast rods are heated in an induction furnace or gas furnace to 400℃~500℃, specifically 480℃, so that the aluminum rods reach a uniform plastic state.

[0068] The second step is to select a mold, design the mold according to the profile cross-section, and preheat the mold to 350℃~450℃ to avoid the cold mold coming into contact with the high temperature aluminum material, which could cause cracking or uneven flow of the aluminum alloy casting rod.

[0069] The third step is to assemble the mold into the die holder of the extruder and check the alignment to prevent misalignment. Then, the heated aluminum alloy casting rod is fed into the extrusion cylinder, and a pressure pad is placed between the extrusion rod and the aluminum alloy casting rod.

[0070] The fourth step involves a hydraulic press pushing an extrusion rod (with pressure typically ranging from 100 to 15,000 tons) to force the aluminum alloy casting rod through a die hole and form it at an extrusion speed of 5 to 50 m / min, thus extruding the aluminum alloy casting rod into the desired profile.

[0071] The fifth step is to obtain the sealing connection part 3 after molding. A blind hole 3013 is opened on the solid part 301, and the solid part 301 is milled by CNC (numerical control milling machine) to form the first inclined surface 3011 and the second inclined surface 3012.

[0072] In one embodiment, such as Figure 6 As shown, it also includes multiple second connecting components 9. The beam body is provided with multiple connecting holes communicating with the cavity 3022. The connecting plate 401 is provided with multiple through holes corresponding to the multiple connecting holes. The second connecting components 9 pass through the through holes and connecting holes to connect the connecting plate 401 to the beam body.

[0073] In one embodiment, such as Figure 6 As shown, the second connecting component 9 includes a connecting cylinder 901 and a connecting rod 902.

[0074] Specifically, the connecting cylinder 901 is provided with a deformation section 9011 and a connecting section 9012 in sequence from its opening to its bottom. The connecting cylinder 901 is located in the cavity 3022 and is arranged corresponding to the connecting hole. The deformation section 9011 is adapted to abut against the inner wall of the beam after deformation. The first end of the connecting rod 902 is provided with an abutment part 9021, which is adapted to abut against the outer wall of the beam. The second end of the connecting rod 902 passes through the through hole and the connecting hole and connects to the connecting section 9012.

[0075] In some embodiments, such as Figure 6 As shown, the connecting cylinder is set in the cavity 3022, and the opening of the connecting cylinder is arranged corresponding to the connecting hole. The connecting rod 902 passes through the through hole on the connecting plate 401, the through hole on the first sealing strip 6 and the connecting hole on the beam in sequence and is inserted into the connecting cylinder. When the connecting rod 902 is rotated, the fifth thread at the second end is screwed into the fourth thread, and the abutting part 9021 of the connecting rod 902 abuts against the connecting plate 401. When the connecting rod 902 is rotated again, the connecting rod 902 pulls the connecting cylinder closer to each other, so that the deformation section near the beam is squeezed and deformed by the inner wall of the beam. After deformation, the connecting rod 9021 and the abutting part together press the connecting plate 401 and the first sealing strip 6 onto the beam, realizing the detachable connection between the cover plate 4 and the beam.

[0076] In some embodiments, such as Figure 5 and Figure 6 As shown, a gasket 11 is provided between the abutting part 9021 and the connecting plate 401, and a gasket 11 is also provided between the connector 502 and the connecting plate 401.

[0077] On the other hand, a battery pack is provided, comprising: a battery pack housing and at least one battery cell, the battery cell being installed inside the housing.

[0078] It should be noted that the battery pack includes the battery pack housing provided in the embodiments of this application, and therefore includes all the advantages of the battery pack housing mentioned above, so it will not be described again.

Claims

1. A battery pack housing, characterized in that, include: Box (1), with an opening on one side; Extension (2), the extension (2) is disposed on the box (1) and located on the periphery of the opening, the extension (2) extends in a direction away from the box (1); The sealing connection part (3) includes a hollow part (302) connected to the extension part (2) and a solid part (301) connected to the hollow part (302); Cover plate (4), which is sealed to the solid part (301).

2. The battery pack housing according to claim 1, characterized in that, Along the first direction (X), a first inclined surface (3011) and a second inclined surface (3012) are provided on both sides of the solid part (301), and along the second direction (Y), the distance between the first inclined surface (3011) and the second inclined surface (3012) gradually decreases; Wherein, the first direction (X) is the length direction of the solid part (301); the second direction (Y) is the direction from the bottom to the top of the solid part (301).

3. The battery pack housing according to claim 2, characterized in that, The solid part (301) is provided with a plurality of blind holes (3013); It also includes a plurality of first connecting components (5), each first connecting component (5) including a connecting seat (501) and a connecting member (502). The plurality of connecting seats (501) are detachably connected to the plurality of blind holes (3013) in a one-to-one correspondence. The plurality of connecting members (502) are detachably connected to the plurality of connecting seats (501) in a one-to-one correspondence. The plurality of connecting members (502) seal the cover plate (4) on the solid part (301).

4. The battery pack housing according to claim 3, characterized in that, It also includes a first sealing strip (6), which is disposed between the cover plate (4) and the solid part (301). The first sealing strip (6) has multiple through holes corresponding to the multiple blind holes (3013), and the cover plate (4) has multiple through holes corresponding to the multiple blind holes (3013). The connector (502) passes through the through holes and the through holes in sequence and is connected to the connector (501).

5. The battery pack housing according to claim 4, characterized in that, The edge of the cover plate (4) extends into a connecting plate (401), which is arranged corresponding to the top surface of the solid part (301) along the second direction (Y), and the perforation is provided on the connecting plate (401).

6. The battery pack housing according to claim 5, characterized in that, The thickness of the connecting plate (401) is 3mm to 5mm.

7. The battery pack housing according to claim 5, characterized in that, The hollow part (302) includes a plurality of plates (3021), which are connected to form a beam. A cavity (3022) is formed inside the beam. The bottom surface of the beam along the second direction (Y) is connected to the extension part (2), and the top surface of the beam along the second direction (Y) is connected to the solid part (301).

8. The battery pack housing according to claim 7, characterized in that, The hollow part (302) and the solid part (301) are integrally formed by aluminum profile extrusion process.

9. The battery pack housing according to claim 7, characterized in that, It also includes multiple second connecting components (9), the beam body is provided with multiple connecting holes communicating with the cavity (3022), the connecting plate (401) is provided with multiple through holes corresponding to the multiple connecting holes, and the second connecting components (9) pass through the through holes and the connecting holes to connect the connecting plate (401) to the beam body.

10. The battery pack housing according to claim 9, characterized in that, The second connection component (9) includes: A connecting cylinder (901) is provided with a deformation section (9011) and a connecting section (9012) in sequence along the direction from its opening to its bottom. The connecting cylinder (901) is located in the cavity (3022) and is arranged corresponding to the connecting hole. The deformation section (9011) is adapted to abut against the inner wall of the beam after deformation. A connecting rod (902) is provided with an abutment part (9021) at its first end, the abutment part (9021) being adapted to abut against the outer wall of the beam, and the second end of the connecting rod (902) passing through the through hole and the connecting hole and connecting to the connecting section (9012).

11. A battery pack, characterized in that, include: The battery pack housing according to any one of claims 1 to 10; At least one battery cell is installed inside the housing.

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