Battery pack box and battery pack

Abstract

The application provides a battery pack box and a battery pack, wherein the battery pack box comprises a bottom plate and a surrounding frame surrounding the bottom plate, the bottom plate and the surrounding frame form a containing space containing batteries, a connecting beam is welded on the side of the surrounding frame away from the containing space, a through hole is arranged on the connecting beam, the axis of the through hole is perpendicular to the bottom plate, at least one side surface of the through hole is attached with an annular gasket, the annular gasket has a center hole, the area of the center hole is smaller than the area of the through hole, and the annular gasket covers part of the through hole, wherein the welding seam length of the connecting beam and the surrounding frame, the length of the connecting beam and the diameter of the through hole satisfy the following relationship: C=A / B; after the connecting beam is welded on the surrounding frame, the annular gasket is attached on the connecting beam and covers part of the through hole, so that the accuracy of the center hole of the annular gasket relative to the connecting beam can be ensured, and the accuracy of the through hole relative to the connecting beam can be ensured.

Description

Technical Field

[0001] This invention relates to the field of new energy battery technology, specifically to a battery pack housing and a battery pack. Background Technology

[0002] The battery pack is a core component of new energy vehicles. It includes a housing and the battery pack itself. Furthermore, the side of the battery pack housing is equipped with lifting lugs for fasteners, thus securing the battery pack housing to the vehicle frame at the bottom. In existing technology, a lifting lug beam is typically welded to the outside of the battery pack housing frame, with lifting lug holes. However, the lifting lug beam can deform during welding, causing the precision of the lifting lug holes to fail to meet requirements. This can lead to misalignment between the mounting holes and the lifting lug holes when the battery pack is subsequently installed on the vehicle. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the lifting lug beam of the battery pack is prone to deformation during welding, resulting in the lifting lug hole failing to meet the precision requirements, thereby providing a battery pack housing and battery pack.

[0004] To address the aforementioned problems, the present invention provides a battery pack housing, comprising a base plate and a frame surrounding the base plate. The base plate and the frame form a receiving space for accommodating a battery. A connecting beam is welded to the side of the frame away from the receiving space. A through hole is provided on the connecting beam, the axis of which is perpendicular to the base plate. An annular gasket is attached to at least one surface of the through hole. The annular gasket has a central hole, the area of ​​which is smaller than the area of ​​the through hole. The annular gasket partially covers the through hole. The weld length between the connecting beam and the frame, the length of the connecting beam, and the diameter of the through hole satisfy the following relationship: Where A is the ratio of weld length to frame length, B is the diameter of through hole, and C is in the range of 0.2 to 16.6. The unit of weld length between connecting beam and frame is mm, the unit of connecting beam length is mm, and the unit of through hole diameter is mm.

[0005] Optionally, the ratio of the area of ​​the central hole to the area of ​​the through hole is in the range of 0.0625 to 1, where the area of ​​the central hole is in mm. 2 The area of ​​the through hole is measured in mm. 2 .

[0006] Optionally, the area of ​​the central hole, the area of ​​the through hole, and the weld length between the connecting beam and the frame satisfy the following relationship: Where D is the ratio of the area of ​​the central hole to the area of ​​the through hole, E is the weld length between the connecting beam and the frame, and F is in the range of 0.0416 to 1.785. The area of ​​the central hole is in mm. 2 The area of ​​the through hole is measured in mm.2 The unit for the weld length between the connecting beam and the frame is mm.

[0007] Optionally, the area of ​​the central hole, the area of ​​the through hole, and the thickness of the annular gasket satisfy the following relationship: Where D is the ratio of the area of ​​the central hole to the area of ​​the through hole, G is the thickness of the annular gasket, and H is in the range of 0.0312 to 1. The area of ​​the central hole is in mm. 2 The area of ​​the through hole is measured in mm. 2 The thickness of the annular gasket is measured in mm.

[0008] Optionally, the ratio of the thickness of the connecting beam to the thickness of the annular gasket is in the range of 2 to 6, wherein the thickness of the annular gasket is in mm and the thickness of the connecting beam is in mm.

[0009] Optionally, the annular gasket has a non-overlapping portion with the through hole along the axial direction of the through hole.

[0010] Optionally, an overflow groove is provided on at least one surface of the annular gasket that is in contact with the connecting beam, and the depth of the overflow groove is in the range of 0.2 mm to 1 mm along the axial direction of the through hole.

[0011] Optionally, the connecting beam is made of steel with a C value in the range of 0.3 to 16.6.

[0012] Alternatively, the frame may be roll-formed or stamped.

[0013] Optionally, the connecting beam is a lifting lug beam, the through hole is a lifting lug hole, and the annular gasket and through hole are adapted to allow the connecting member to pass through.

[0014] Optionally, the connecting beam is provided with an annular recess surrounding the through hole, and at least a portion of the annular gasket is accommodated within the annular recess.

[0015] The present invention also provides a battery pack, a battery pack housing, and a battery pack disposed within the battery pack housing, wherein the battery pack is the aforementioned battery pack.

[0016] The present invention has the following advantages:

[0017] By utilizing the technical solution of this invention, after the connecting beam is welded to the frame, an annular gasket is attached to the connecting beam, partially covering the through hole. Therefore, by ensuring the accuracy of the central hole of the annular gasket relative to the connecting beam, the accuracy of the through hole relative to the connecting beam is also ensured, preventing misalignment during subsequent installation. Furthermore, by ensuring that the weld length between the connecting beam and the frame, the length of the connecting beam, and the diameter of the through hole meet a certain proportional relationship, assembly accuracy is guaranteed without affecting the structural strength of the connecting beam. Therefore, the technical solution of this invention solves the defect in the prior art where the lifting lug beam of the battery pack is prone to deformation during welding, resulting in the lifting lug hole failing to meet accuracy requirements. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in 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 the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A structural schematic diagram of the battery pack housing of the present invention is shown from the bottom view.

[0020] Figure 2 It shows Figure 1 A structural schematic diagram of the connecting beam of the battery pack housing;

[0021] Figure 3 It shows Figure 2 A schematic diagram of the structure at the central annular gasket;

[0022] Figure 4 It shows Figure 3 Cross-sectional view of the annular gasket.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10. Base plate; 20. Enclosure frame; 30. Connecting beam; 40. Through hole; 50. Annular gasket; 51. Center hole. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, 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 the invention and for 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 the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly 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 or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] First, it should be noted that the units for lengths and areas in this embodiment are mm. 2 .

[0030] like Figures 1 to 4 As shown, an embodiment of the battery pack housing according to this application includes a base plate 10, a frame 20, and a connecting beam 30. The frame 20 is disposed at the edge of the base plate 10, and the connecting beam 30 is welded to the outer side of the frame 20. Further, the connecting beam 30 has a through hole 40, and an annular gasket 50 is attached to the surface of the through hole 40. The annular gasket 50 has a central hole 51, and the area of ​​the central hole 51 is smaller than the area of ​​the through hole 40, so that the annular gasket 50 can partially cover the through hole 40.

[0031] Furthermore, the weld length between the connecting beam 30 and the frame 20, the length d1 of the connecting beam 30, and the diameter d2 of the through hole 40 satisfy the following relationship:

[0032] ;

[0033] Where A is the ratio of the weld length to the length d1 of the frame 20, B is the diameter d2 of the through hole 40, and C is in the range of 0.2 to 16.6.

[0034] Furthermore, the unit of the weld length between the connecting beam 30 and the frame 20 is mm, the unit of the length d1 of the connecting beam 30 is mm, and the unit of the diameter d2 of the through hole 40 is mm.

[0035] Using the technical solution of this embodiment, after the connecting beam 30 is welded to the frame 20, the annular gasket 50 is attached to the connecting beam 30, partially covering the through hole 40. Therefore, by ensuring the accuracy of the center hole of the annular gasket 50 relative to the connecting beam 30, the accuracy of the through hole 40 relative to the connecting beam 30 can be guaranteed, preventing misalignment during subsequent installation. Furthermore, by ensuring that the weld length between the connecting beam 30 and the frame 20, the length d1 of the connecting beam 30, and the diameter d2 of the through hole 40 meet a certain proportional relationship, assembly accuracy can be guaranteed without affecting the structural strength of the connecting beam. Therefore, the technical solution of this embodiment solves the defect in the prior art where the lifting lug beam of the battery pack is prone to deformation during welding, resulting in the lifting lug hole failing to meet accuracy requirements.

[0036] like Figure 1 As shown, in the battery pack housing, the frame 20 surrounds the base plate 10, and the base plate 10 and the frame 20 together form a receiving space for accommodating the battery pack. The connecting beam 30 is a long, strip-shaped beam structure, and it is welded to the side of the frame 20, that is, to the side of the frame 20 away from the receiving space.

[0037] from Figure 4 As can be seen, the axis of the through hole 40 is set to be perpendicular to the plane of the base plate 10.

[0038] Furthermore, during the welding process, the heat generated during welding will cause the connecting beam 30 to deform. After the connecting beam 30 is deformed, it will affect the positional accuracy of the through hole 40 on the connecting beam 30, which may lead to misalignment during subsequent assembly. In severe cases, it may cause the battery pack box to be unable to be assembled.

[0039] To address this issue, in this embodiment, an annular gasket 50 is affixed to the connecting beam 30. Since the annular gasket 50 has an annular structure, it has a central hole 51. Because the area of ​​the central hole 51 is smaller than the area of ​​the through hole 40, when the annular gasket 50 is affixed to the through hole 40 of the connecting beam 30, the annular gasket 50 can partially cover the through hole 40, and the central hole 51 of the annular gasket 50 is entirely within the range of the through hole 40, effectively restricting the internal range of the through hole 40. Therefore, by ensuring the positional accuracy of the central hole 51 of the annular gasket 50 relative to the connecting beam 30, the positional accuracy of the through hole 40 relative to the connecting beam 30 can be guaranteed.

[0040] Optionally, the annular gasket 50 is made of metal to ensure that the annular gasket 50 has sufficient strength and meets the subsequent installation strength requirements.

[0041] Optionally, both the inner and outer edges of the annular gasket 50 are circular. Of course, those skilled in the art can adjust the shape of the outer edge of the annular gasket 50 according to actual needs.

[0042] It should be noted that the area of ​​the through hole 40 mentioned above refers to the area of ​​the cross-sectional shape (circular) of the through hole 40. Correspondingly, the area of ​​the center hole 51 mentioned above refers to the area of ​​the cross-sectional shape (circular) of the center hole 51.

[0043] The following describes the processing of the battery pack housing in this embodiment:

[0044] 1. Machining the connecting beam 30, and machining through holes 40 at the preset positions of the connecting beam 30. The machining size of the through holes 40 should be slightly larger than the preset size.

[0045] 2. Machining the annular gasket 50, the size of the center hole 51 of the annular gasket 50 is the preset size (design size) of the through hole 40;

[0046] 3. Weld the connecting beam 30 to the side of the enclosure 20;

[0047] 4. Place the annular gasket 50 on the connecting beam 30. The annular gasket 50 covers part of the through hole 40, and the relative position of the axis of the central hole 51 and the connecting beam 30 must meet the design positional accuracy between the axis of the through hole 40 and the connecting beam 30.

[0048] Furthermore, the weld length between the connecting beam 30 and the frame 20, the length d1 of the connecting beam 30, and the diameter d2 of the through hole 40 satisfy the following relationship:

[0049] ;

[0050] Where A is the ratio of the weld length to the length d1 of the frame 20, B is the diameter d2 of the through hole 40, and C is in the range of 0.2 to 16.6.

[0051] The unit for the weld length between the connecting beam 30 and the frame 20 is mm, the unit for the length d1 of the connecting beam 30 is mm, and the unit for the diameter d2 of the through hole 40 is mm.

[0052] In the above formula, A represents the degree of deformation of the connecting beam 30 after welding, and B is the diameter d2 of the through hole 40. The longer the weld length between the connecting beam 30 and the frame 20, the greater the deformation of the connecting beam 30 after welding. In this case, it is necessary to appropriately increase the diameter d2 of the through hole 40 to prevent significant displacement of the through hole 40 due to large deformation of the connecting beam 30.

[0053] Furthermore, the value of C cannot be too large. If C is too large, it means that the diameter d2 of the through hole 40 is small, which may not guarantee assembly accuracy if the deformation of the connecting beam 30 is large. Conversely, the value of C cannot be too small. If C is too large, it means that the diameter d2 of the through hole 40 is large. Opening a large-diameter through hole 40 in the connecting beam 30 will weaken the structural strength of the connecting beam 30 and is not conducive to the subsequent connection strength between the connecting beam 30 and the vehicle frame.

[0054] Therefore, preferably, C in this embodiment is in the range of 0.2 to 13.6.

[0055] For example, the value of C can be 0.2, 1, 3, 5, 7, 9, 10, 13, or 13.6.

[0056] like Figure 3 As shown, in the technical solution of this embodiment, the ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40 is in the range of 0.0625 to 1.

[0057] It should be noted that the ratio of the area of ​​the center hole 51 to the area of ​​the through hole 40 cannot be 1. If the ratio is 1, it means that the area of ​​the center hole 51 is equal to the area of ​​the through hole 40. In this case, the annular gasket 50 cannot play a role in adjusting and correcting the positional accuracy of the through hole 40.

[0058] Specifically, from Figure 3 As shown, the annular gasket 50 is attached to the connecting beam 30. The area of ​​the central hole 51 is smaller than the area of ​​the through hole 40. Therefore, the annular gasket 50 covers part of the through hole 40, that is, the hole wall of the through hole 40 is blocked by the annular gasket 50.

[0059] Figure 3 The innermost solid coil shows the outline of the central hole 51, and the area of ​​the central hole 51 is the area enclosed by the solid coil. Figure 3 The dashed circle shows the outline of the through hole 40 below the annular gasket 50, and the area of ​​the through hole 40 is the area enclosed by the dashed circle. Therefore, the bonding area S between the annular gasket 50 and the connecting beam 30 is... Figure 3 The area enclosed by the outermost solid and dashed coils.

[0060] Those skilled in the art will understand that if the bonding area S is too large, it will lead to material waste of the annular gasket 50, and if the bonding area S is too small, it will weaken the bonding strength between the annular gasket 50 and the connecting beam 30, and may cause the annular gasket 50 to fall off the connecting beam 30.

[0061] Furthermore, the larger the ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40, the larger the central hole 51 is, and therefore the smaller the area of ​​the through hole 40 covered by the central hole 51. Conversely, the smaller the ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40, the smaller the central hole 51 is, and therefore the smaller the area of ​​the through hole 40 covered by the central hole 51.

[0062] Furthermore, the ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40 cannot be too small. If this ratio is too small, the distance by which the wall of the central hole 51 protrudes from the wall of the through hole 40 will be larger, meaning the lever arm will be longer. Subsequently, during the installation of the connector, the tightening force applied to the annular gasket 50 will be larger (the lever arm will be larger), easily causing the annular gasket 50 to detach from the connecting beam 30. The ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40 cannot be too large. If this ratio is too large, the area of ​​the central hole 51 will be closer to the through hole 40, thus limiting its ability to adjust and correct the positional accuracy of the through hole 40. Therefore, preferably, in this embodiment, the ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40 is in the range of 0.0625 to 1 (excluding 1).

[0063] The area of ​​the central hole 51 is measured in mm. 2 The area of ​​the 40mm through hole is measured in mm². 2 .

[0064] For example, the ratio can take values ​​such as 0.0625, 0.1, 0.2, 0.5, 0.7, or 0.9, etc.

[0065] Furthermore, in the technical solution of this embodiment, the area of ​​the central hole 51, the area of ​​the through hole 40, and the weld length between the connecting beam 30 and the frame 20 satisfy the following relationship:

[0066] ;

[0067] Where D is the ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40, E is the weld length of the connecting beam 30 and the frame 20, and F is in the range of 0.0416 to 1.758.

[0068] The area of ​​the central hole 51 is measured in mm. 2 The area of ​​the 40mm through hole is measured in mm². 2 The unit for the weld length between the connecting beam 30 and the frame 20 is mm.

[0069] As mentioned above, D is the ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40. Therefore, the smaller the value of D, the smaller the area of ​​the central hole 51 relative to the area of ​​the through hole 40, meaning that the adjustment range of the positional accuracy of the central hole 51 relative to the through hole 40 is greater. The larger the value of D, the larger the area of ​​the central hole 51 relative to the area of ​​the through hole 40, meaning that the adjustment range of the positional accuracy of the central hole 51 relative to the through hole 40 is smaller.

[0070] Furthermore, E represents the weld length between the connecting beam 30 and the frame 20. Therefore, the larger the value of E, the more easily the connecting beam 30 deforms after welding, and the larger the deformation curvature may exist on the surface of the connecting beam 30. In this case, the value of D can be appropriately reduced to increase the adjustment range of the positional accuracy of the annular shim 50 on the through hole 40, making it easier for the annular shim 50 to correct the positional accuracy of the through hole 40.

[0071] Furthermore, the larger the E value, the smaller the deformation of the connecting beam 30 after welding, and the smaller the degree of deformation on the surface of the connecting beam 30. In this case, the D value can be appropriately increased, and the adjustment range of the annular gasket 50 for the positional accuracy of the through hole 40 can be appropriately reduced, so that the annular gasket 50 can correct the positional accuracy of the through hole 40. At the same time, it can also prevent the connecting parts from applying excessive tightening force to the center of the annular gasket 50.

[0072] Therefore, preferably, the value of F in this embodiment is in the range of 0.0416 to 1.785.

[0073] For example, the value of F can be 0.0416, 0.05, 0.07, 0.1, 0.5, 1, 1.7 or 1.785, etc.

[0074] like Figure 4 As shown, in the technical solution of this embodiment, the area of ​​the central hole 51, the area of ​​the through hole 40, and the thickness d3 of the annular gasket 50 satisfy the following relationship:

[0075] ;

[0076] Where D is the ratio of the area of ​​the central hole 51 to the area of ​​the through hole 40, G is the thickness d3 of the annular gasket 50, and H is in the range of 0.0312 to 1.

[0077] The area of ​​the central hole 51 is measured in mm. 2 The area of ​​the 40mm through hole is measured in mm². 2 The thickness d3 of the annular gasket 50 is in mm.

[0078] from Figure 4 As can be seen, the thickness d3 of the annular gasket 50 is the dimension of the annular gasket 50 along the direction perpendicular to the bonding surface of the annular gasket 50.

[0079] First, the value of d3 cannot be too large, as a large d3 means a thicker annular gasket 50, which will occupy more installation space. Conversely, the value of d3 cannot be too small, as a small d3 means a thinner annular gasket 50, which will result in poorer strength.

[0080] Secondly, as mentioned above, the smaller the value of D, the smaller the diameter of the center hole 51 relative to the diameter of the through hole 40, and the greater the locking force applied by the connector after the battery pack housing is assembled onto the frame. In this case, the value of d3 should be appropriately increased to give the annular gasket 50 higher strength and prevent the locking force from crushing the annular gasket 50. Conversely, the larger the value of D, the larger the diameter of the center hole 51 relative to the diameter of the through hole 40, and the smaller the locking force applied by the connector after the battery pack housing is assembled onto the frame. In this case, the value of d3 can be appropriately decreased to give the annular gasket 50 a certain strength while making the thickness of the annular gasket 50 as thin as possible.

[0081] Therefore, preferably, the ratio of H in this embodiment is in the range of 0.0312 to 1.

[0082] For example, the value of this ratio can be 0.0321, 0.05, 0.1, 0.2, 0.5, 0.7, or 1, etc.

[0083] like Figure 4 As shown, in the technical solution of this embodiment, the ratio of the thickness d4 of the connecting beam 30 to the thickness d3 of the annular gasket 50 is in the range of 2 to 6.

[0084] The thickness d3 of the annular gasket 50 is in mm, and the thickness d4 of the connecting beam 30 is in mm.

[0085] from Figure 4 As can be seen, the thickness d3 of the annular gasket 50 and the thickness d4 of the connecting beam 30 are, that is, the dimensions of the annular gasket 50 and the connecting beam 30 along the direction perpendicular to the bonding surface of the annular gasket 50.

[0086] Furthermore, the ratio of d4 to d3 mentioned above cannot be too large. If the ratio is too large, the thickness of the annular gasket 50 will be greater than the thickness of the connecting beam 30, which will occupy more installation space. Conversely, the ratio cannot be too small, as this will result in the annular gasket 50 being thinner than the connecting beam 30, leading to poor strength of the annular gasket 50.

[0087] Therefore, preferably, the ratio of d4 to d3 in this embodiment is in the range of 2 to 6.

[0088] For example, the ratio of d4 to d3 can be 2, 3, 4, 5, or 6.

[0089] Furthermore, in the technical solution of this embodiment, the annular gasket 50 and the through hole 40 do not overlap along the axial direction of the through hole 40.

[0090] Specifically, the annular gasket 50 is a thin sheet structure, which is attached to the connecting beam 30 and located outside the through hole 40. That is, the inner wall of the central hole 51 and the inner wall of the through hole 40 are offset in the axial direction, meaning that the inner wall of the central hole 51 and the inner wall of the through hole 40 do not overlap in the axial direction.

[0091] Furthermore, the inner edge of the annular gasket 50 does not have a boss structure extending into the through hole 40.

[0092] like Figure 4 As shown, in the technical solution of this embodiment, an overflow groove is provided on at least one surface of the annular gasket 50 and the connecting beam 30 that are in contact with each other. The depth of the overflow groove is in the range of 0.2 mm to 1 mm along the axial direction of the through hole 40.

[0093] Specifically, once the adhesive enters the overflow groove, it increases the contact area between the adhesive and the annular gasket 50 and / or the connecting beam 30, thereby improving the bonding strength.

[0094] It should be noted that the above-mentioned "at least one surface of the annular gasket 50 and the connecting beam 30 in contact with each other is provided with an overflow groove" means that the overflow groove can be provided on the surface of the annular gasket 50 in contact with the connecting beam 30, or the overflow groove can also be provided on the surface of the connecting beam 30 in contact with the annular gasket 50, or the overflow groove can be provided on both surfaces of the connecting beam 30 in contact with the annular gasket 50.

[0095] Optionally, the glue overflow groove can be any shape, such as ring, straight, curved, or irregular, as long as it can increase the contact area between the glue and the bonding surface.

[0096] Furthermore, the depth of the adhesive overflow groove should not be too small, otherwise the effect of increasing adhesive strength will be limited. Conversely, the depth of the adhesive overflow groove should not be too large, otherwise it will weaken the structural strength of the connecting beam 30 and / or the annular gasket 50.

[0097] Therefore, preferably, the depth of the overflow groove in this embodiment is in the range of 0.2 mm to 1 mm.

[0098] Optionally, the connecting beam 30 is made of steel, and C is in the range of 0.3 to 16.6.

[0099] Specifically, steel has a higher strength, so the strength of the connecting beam 30 can be improved. However, it is more prone to phase transformation when heated. Furthermore, the longer the weld size, the greater the deformation of the connecting beam 30 caused by welding. Therefore, the diameter d2 of the through hole 40 also needs to be increased accordingly.

[0100] As mentioned above, the value of C cannot be too large. If C is too large, it means that the diameter d2 of the through hole 40 is small, which may not guarantee assembly accuracy when the deformation of the connecting beam 30 is large. Furthermore, the value of C cannot be too small either. If C is too large, it means that the diameter d2 of the through hole 40 is large. Creating a large-diameter through hole 40 on the connecting beam 30 will weaken the structural strength of the connecting beam 30, which is detrimental to the subsequent connection strength between the connecting beam 30 and the vehicle.

[0101] Therefore, preferably, when the connecting beam 30 is made of steel, C in this embodiment is in the range of 0.3 to 16.6.

[0102] For example, the value of C can be 0.3, 0.4, 0.7, 1, 5, 10, 16, or 16.6, etc.

[0103] Optionally, the frame 20 is roll-formed, or the frame 20 is stamped.

[0104] Specifically, the deformation of the battery pack housing formed by roll forming or stamping is greater during the welding process. Therefore, the annular gasket 50 in this embodiment is required to correct the positional displacement of the through hole 40 during the welding process.

[0105] Optionally, in the technical solution of this embodiment, an annular recess is provided on the connecting beam 30, the annular recess surrounds the through hole 40, and at least a portion of the annular gasket 50 is accommodated in the annular recess.

[0106] Specifically, by setting an annular recess, while maximizing the thickness d3 of the annular gasket 50, the height of the annular gasket 50 protruding from the surface of the connecting beam 30 can be minimized, and even the outer surface of the annular gasket 50 can be flush with the surface of the connecting beam 30, thereby minimizing the height space occupied by the annular gasket 50.

[0107] Of course, the depth of the annular recess should not be too large, otherwise it will weaken the strength of the profile of the connecting beam 30.

[0108] like Figure 1 As shown, in the technical solution of this embodiment, the connecting beam 30 is a lifting lug beam, the through hole 40 is a lifting lug hole, and the annular gasket 50 and the through hole 40 are adapted to allow the connecting member to pass through.

[0109] Optionally, the lifting lugs and lifting lug holes are used to fix the battery pack housing to the bottom frame of the vehicle body. Therefore, the positional accuracy of the lifting lug holes is required to be high. Otherwise, the battery pack housing may not be able to be assembled on the frame.

[0110] Optionally, the lifting lugs are located on the side of the battery pack housing.

[0111] In some embodiments not shown, the connecting beam 30 and through hole 40 described above can also be used for connection with other structures, and are not limited to connection with the bottom of the frame.

[0112] This application also provides a battery pack, an embodiment of which includes a battery pack housing and a battery pack disposed within the housing, wherein the battery pack is the aforementioned battery pack.

[0113] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A battery pack housing, characterized in that, The device includes a base plate (10) and a frame (20) surrounding the base plate (10). The base plate (10) and the frame (20) form a storage space for accommodating the battery. A connecting beam (30) is welded to the side of the frame (20) away from the storage space. A through hole (40) is provided on the connecting beam (30). The axis of the through hole (40) is perpendicular to the base plate (10). An annular gasket (50) is attached to at least one side surface of the through hole (40). The annular gasket (50) has a central hole (51). The area of ​​the central hole (51) is smaller than the area of ​​the through hole (40). The annular gasket (50) covers part of the through hole (40). The weld length between the connecting beam (30) and the frame (20), the length (d1) of the connecting beam (30), and the diameter (d2) of the through hole (40) satisfy the following relationship: ； Wherein, A is the ratio of the weld length to the length (d1) of the frame (20), B is the diameter (d2) of the through hole (40), and C is in the range of 0.2 to 16.

6. The unit of the weld length between the connecting beam (30) and the frame (20) is mm, the unit of the length (d1) of the connecting beam (30) is mm, and the unit of the diameter (d2) of the through hole (40) is mm. The area of ​​the central hole (51), the area of ​​the through hole (40), and the weld length between the connecting beam (30) and the frame (20) satisfy the following relationship: ； Wherein, D is the ratio of the area of ​​the central hole (51) to the area of ​​the through hole (40), E is the weld length between the connecting beam (30) and the frame (20), and F is in the range of 0.0416 to 1.

758. The area of ​​the central hole (51) is in mm. 2 The area of ​​the through hole (40) is in mm. 2 The unit of the weld length between the connecting beam (30) and the frame (20) is mm.

2. The battery pack housing according to claim 1, characterized in that, The ratio of the area of ​​the central hole (51) to the area of ​​the through hole (40) is in the range of 0.0625 to 1. The area of ​​the central hole (51) is in mm. 2 The area of ​​the through hole (40) is in mm. 2 .

3. The battery pack housing according to claim 1, characterized in that, The area of ​​the central hole (51), the area of ​​the through hole (40), and the thickness (d3) of the annular gasket (50) satisfy the following relationship: ； Wherein, D is the ratio of the area of ​​the central hole (51) to the area of ​​the through hole (40), G is the thickness (d3) of the annular gasket (50), and H is in the range of 0.0312 to 1. The area of ​​the central hole (51) is in mm. 2 The area of ​​the through hole (40) is in mm. 2 The thickness (d3) of the annular gasket (50) is in mm.

4. The battery pack housing according to claim 1, characterized in that, The ratio of the thickness (d4) of the connecting beam (30) to the thickness (d3) of the annular gasket (50) is in the range of 2 to 6. The thickness (d3) of the annular gasket (50) is in mm, and the thickness (d4) of the connecting beam (30) is in mm.

5. The battery pack housing according to claim 1, characterized in that, Along the axial direction of the through hole (40), the annular gasket (50) does not overlap with the through hole (40).

6. The battery pack housing according to claim 1, characterized in that, An overflow groove is provided on at least one surface of the annular gasket (50) that is in contact with the connecting beam (30), and the depth of the overflow groove is in the range of 0.2 mm to 1 mm along the axial direction of the through hole (40).

7. The battery pack housing according to claim 1, characterized in that, The connecting beam (30) is made of steel, and C is in the range of 0.3 to 16.

6.

8. The battery pack housing according to claim 1, characterized in that, The frame (20) is formed by roll forming or by stamping.

9. The battery pack housing according to any one of claims 1 to 8, characterized in that, The connecting beam (30) is a lifting lug beam, the through hole (40) is a lifting lug hole, and the annular gasket (50) and the through hole (40) are adapted to allow the connecting member to pass through.

10. The battery pack housing according to any one of claims 1 to 8, characterized in that, The connecting beam (30) is provided with an annular recess, which surrounds the through hole (40), and at least a portion of the annular gasket (50) is accommodated in the annular recess.

11. A battery pack, characterized in that, The battery pack housing and the battery pack disposed within the battery pack housing, wherein the battery pack housing is the battery pack housing according to any one of claims 1 to 10.

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