Battery pack box body and battery pack

Abstract

The invention provides a battery pack box body and a battery pack, the battery pack box body comprises a bottom plate and a surrounding frame surrounding the periphery of the bottom plate, the bottom plate and the surrounding frame form a containing space for containing a battery, a connecting beam is welded to one side, away from the containing space, of the surrounding frame, a through hole is formed in the connecting beam, the axis of the through hole is perpendicular to the bottom plate, and the axis of the through hole is perpendicular to the bottom plate. An annular gasket is attached to the surface of at least one side of the through hole, the annular gasket is provided with a center hole, the area of the center hole is smaller than that of the through hole, the annular gasket covers part of the through hole, and the length of the weld joint of the connecting beam and the enclosure frame, the length of the connecting beam and the diameter of the through hole meet the following relation: C = A / B; after the connecting beam is welded to the enclosure frame, the annular gasket is attached to the connecting beam and covers part of the through hole, and therefore the precision of the through hole relative to the connecting beam can be guaranteed by guaranteeing the precision of the center hole of the annular gasket relative to the connecting beam.

Description

Technical Field

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

[0002] The battery pack is a core component of new energy vehicles. The battery pack includes a box and a battery pack arranged in the box. Furthermore, the side of the battery pack box is provided with a lifting lug, which is used to pass fasteners to fix the battery pack box to the frame at the bottom of the vehicle body. In the prior art, a lifting lug beam is usually welded on the outside of the frame of the battery pack box, and the lifting lug beam is provided with a lifting lug hole. However, the lifting lug beam will deform during the welding process, resulting in the lifting lug hole's accuracy failing to meet the requirements. When the battery pack is subsequently assembled on the vehicle, the mounting hole and the lifting lug hole are prone to misalignment. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the ear beam of the battery pack is easily deformed during welding, resulting in the ear hole failing to meet the precision requirement, thereby providing a battery pack case and a battery pack.

[0004] In order to solve the above problems, the present invention provides a battery pack box, comprising a bottom plate and a surrounding frame arranged around the bottom plate, the bottom plate and the surrounding frame form a storage space for accommodating batteries, a connecting beam is welded on a side of the surrounding frame away from the storage space, a through hole is arranged on the connecting beam, the axis of the through hole is perpendicular to the bottom plate, an annular gasket is attached to at least one side surface of the through hole, the annular gasket has a central hole, the area of ​​the central hole is smaller than the area of ​​the through hole, and the annular gasket covers part of the through hole, wherein the length of the weld between the connecting beam and the surrounding frame, the length of the connecting beam and the diameter of the through hole satisfy the following relationship: Among them, A is the ratio of the weld length to the length of the frame, B is the diameter of the through hole, C is in the range of 0.2 to 16.6, the unit of the weld length connecting the beam and the frame is mm, the unit of the length of the connecting beam is mm, and the unit of the diameter of the through hole 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, wherein the unit of the area of ​​the central hole is mm 2 , the unit of the through hole area is mm 2 .

[0006] Optionally, the area of ​​the central hole, the area of ​​the through hole, and the length of the weld connecting the beam and the surrounding frame satisfy the following relationship: Where D is the ratio of the area of ​​the center hole to the area of ​​the through hole, E is the length of the weld connecting the beam and the frame, F is in the range of 0.0416 to 1.785, and the unit of the area of ​​the center hole is mm 2 , the unit of the through hole area is mm2 The unit of the weld length connecting the beam and the frame is mm.

[0007] Optionally, the area of ​​the center 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 center hole to the area of ​​the through hole, G is the thickness of the annular gasket, H is in the range of 0.0312 to 1, and the unit of the area of ​​the center hole is mm 2 , the unit of the through hole area is mm 2 , the unit of thickness of the annular gasket is mm.

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

[0009] Optionally, in the axial direction of the through hole, the annular gasket has no overlapping portion with the through hole.

[0010] Optionally, a glue overflow groove is provided on at least one of the surfaces of the annular gasket and the connecting beam that are in contact with each other, and a depth of the glue overflow groove is in a range of 0.2 mm to 1 mm in the axial direction of the through hole.

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

[0012] Optionally, the surrounding frame is roll-formed, or the surrounding frame is stamped.

[0013] Optionally, the connecting beam is a lifting ear beam, the through hole is a lifting ear hole, and the annular gasket and the through hole are suitable for allowing the connecting member to pass through.

[0014] Optionally, an annular recess is provided on the connecting beam, the annular recess is arranged around the through hole, and at least a part of the annular gasket is accommodated in the annular recess.

[0015] The present invention also provides a battery pack, a battery pack case, and a battery group arranged in the battery pack case, wherein the battery group is the above-mentioned battery pack.

[0016] The present invention has the following advantages:

[0017] By utilizing the technical solution of the present invention, after the connecting beam is welded to the surrounding frame, the annular gasket is attached to the connecting beam and covers part of the through hole. Therefore, by ensuring the accuracy of the center hole of the annular gasket relative to the connecting beam, the accuracy of the through hole relative to the connecting beam can be ensured, and misalignment will not occur during subsequent installation. Furthermore, by ensuring that the weld length between the connecting beam and the surrounding frame, the length of the connecting beam, and the diameter of the through hole meet a certain proportional relationship, the assembly accuracy can be ensured while not affecting the structural strength of the connecting beam. Therefore, the technical solution of the present invention solves the defect in the prior art that the ear beam of the battery pack is easily deformed during welding, resulting in the ear hole failing to meet the accuracy requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram showing the structure of a battery pack box according to the present invention from a bottom perspective;

[0020] Figure 2 Shows Figure 1 A schematic diagram of the structure of the connecting beam of the middle battery pack box;

[0021] Figure 3 Shows Figure 2 Schematic diagram of the structure at the middle annular gasket;

[0022] Figure 4 Shows Figure 3 Cross-sectional view of the middle annular gasket.

[0023] Description of reference numerals:

[0024] 10. Bottom plate; 20. Frame; 30. Connecting beam; 40. Through hole; 50. Ring gasket; 51. Center hole. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, 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 of all, it should be noted that the length units in this embodiment are mm, and the area units are mm. 2 .

[0030] like Figures 1 to 4 As shown, the embodiment of the battery pack box according to the present application includes a bottom plate 10, a surrounding frame 20 and a connecting beam 30. The surrounding frame 20 is arranged at the edge of the bottom plate 10, and the connecting beam 30 is welded to the outside of the surrounding frame 20. Furthermore, a through hole 40 is arranged on the connecting beam 30, and an annular gasket 50 is attached to the surface of the through hole 40. The annular gasket 50 has a center hole 51, and the area of ​​the center hole 51 is smaller than the area of ​​the through hole 40, so that the annular gasket 50 can cover part of the through hole 40.

[0031] Furthermore, the length of the weld between the connecting beam 30 and the surrounding 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] Wherein, A is the ratio of the length of the weld to the length d1 of the surrounding 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] Further, the unit of the weld length between the connecting beam 30 and the surrounding 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] By utilizing the technical solution of this embodiment, after the connecting beam 30 is welded to the surrounding frame 20, the annular gasket 50 is attached to the connecting beam 30 and partially covers 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 ensured, and no misalignment will occur during subsequent installation. Furthermore, by ensuring that the weld length between the connecting beam 30 and the surrounding frame 20, the length d1 of the connecting beam 30, and the diameter d2 of the through hole 40 meet a certain proportional relationship, the assembly accuracy can be ensured while not affecting the structural strength of the connecting beam. Therefore, the technical solution of this embodiment solves the defect in the prior art that the ear beam of the battery pack is easily deformed during welding, resulting in the ear hole failing to meet the accuracy requirements.

[0036] like Figure 1 As shown, in the battery pack box, the frame 20 surrounds the bottom plate 10, and the bottom plate 10 and the frame 20 enclose a receiving space, and the receiving space is used to receive the battery pack. The connecting beam 30 is a long beam structure, and the connecting beam 30 is connected to the side of the frame 20 by welding, that is, connected to the side of the frame 20 away from the receiving space.

[0037] from Figure 4 It can be seen that the axis of the through hole 40 is arranged to be perpendicular to the plane where the bottom plate 10 is located.

[0038] Furthermore, during the welding process, the heat generated by the welding will cause the connecting beam 30 to deform. After the connecting beam 30 is deformed, the position accuracy of the through hole 40 on the connecting beam 30 will be affected, and misalignment may occur in the subsequent assembly process. In severe cases, the battery pack body cannot be assembled.

[0039] In order to solve this problem, in this embodiment, an annular gasket 50 is attached to the connecting beam 30. Since the annular gasket 50 is an annular structure, it has a center hole 51. Since the area of ​​the center hole 51 is smaller than the area of ​​the through hole 40, when the annular gasket 50 is attached to the through hole 40 of the connecting beam 30, the annular gasket 50 can cover part of the through hole 40, and the center hole 51 of the annular gasket 50 is entirely located within the range of the through hole 40, which is equivalent to the annular gasket 50 limiting the range inside the through hole 40. Therefore, by ensuring the position accuracy of the center hole 51 of the annular gasket 50 attached to the connecting beam 30 relative to the connecting beam 30, the position accuracy of the through hole 40 relative to the connecting beam 30 can be ensured.

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

[0041] Optionally, the inner and outer edges of the annular gasket 50 are both circular structures. 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 central hole 51 mentioned above refers to the area of ​​the cross-sectional shape (circular) of the central hole 51.

[0043] The processing of the battery pack case of this embodiment is described below:

[0044] 1. Process the connecting beam 30 and process the through hole 40 at the preset position of the connecting beam 30. The processing size of the through hole 40 should be slightly larger than the preset size;

[0045] 2. Processing 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 surrounding frame 20;

[0047] 4. The annular gasket 50 is attached to the connecting beam 30 , the annular gasket 50 covers part of the through hole 40 , and the relative position between the axis of the central hole 51 and the connecting beam 30 must meet the designed position accuracy between the axis of the through hole 40 and the connecting beam 30 .

[0048] Furthermore, the length of the weld between the connecting beam 30 and the surrounding 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] Wherein, A is the ratio of the length of the weld to the length d1 of the surrounding 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 of the weld length between the connecting beam 30 and the surrounding 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.

[0052] In the above relationship, A represents the degree of deformation of the connecting beam 30 after welding, and B represents the diameter d2 of the through hole 40. The longer the weld length between the connecting beam 30 and the surrounding frame 20, the greater the degree of deformation of the connecting beam 30 after welding. In this case, the diameter d2 of the through hole 40 needs to be appropriately increased to prevent the large deformation of the connecting beam 30 from causing serious displacement of the through hole 40.

[0053] Furthermore, the above-mentioned C value cannot be too large. If the C value is too large, it means that the diameter d2 of the through hole 40 is small, and the assembly accuracy may not be guaranteed when the deformation degree of the connecting beam 30 is large. And the above-mentioned C value cannot be too small. If the C value is too large, it means that the diameter d2 of the through hole 40 is large. Opening a through hole 40 with a large diameter on the connecting beam 30 will weaken the structural strength of the connecting beam 30, which 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 adjust and correct the position accuracy of the through hole 40.

[0058] Specifically, from Figure 3 As can be seen from the content shown, the annular gasket 50 is attached to the connecting beam 30 , and the area of ​​the central hole 51 is smaller than the area of ​​the through hole 40 , so 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 center hole 51. The area of ​​the center hole 51 is the area enclosed by the solid coil. Figure 3 The dotted circle in the middle 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 dotted circle. Therefore, the bonding area S between the annular gasket 50 and the connecting beam 30 is Figure 3 The range enclosed by the outermost solid circle and the dotted circle.

[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 adhesive connection strength between the annular gasket 50 and the connecting beam 30, and there will be a risk of the annular gasket 50 falling off the connecting beam 30.

[0061] Further, 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 thus the smaller the area of ​​the through hole 40 covered by the central hole 51 is. 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 thus the smaller the area of ​​the through hole 40 covered by the central hole 51 is.

[0062] Furthermore, the ratio of the area of ​​the center hole 51 to the area of ​​the through hole 40 cannot be too small. If the ratio is too small, the hole wall of the center hole 51 protrudes from the hole wall of the through hole 40 by a greater distance, that is, the lever arm is longer. When the connector is subsequently installed, the force applied by the fastening force on the annular gasket 50 is larger (the lever arm is larger), which can easily cause the annular gasket 50 to detach from the connecting beam 30. The ratio of the area of ​​the center hole 51 to the area of ​​the through hole 40 cannot be too large. If the ratio is too large, the area of ​​the center hole 51 is closer to the through hole 40, so the adjustment and correction effect on the position accuracy of the through hole 40 is limited. Therefore, preferably, in this embodiment, the ratio of the area of ​​the center hole 51 to the area of ​​the through hole 40 is in the range of 0.0625 to 1 (excluding 1).

[0063] The unit of the area of ​​the center hole 51 is mm 2 , the area of ​​the through hole 40 is in mm 2 .

[0064] For example, the value of the ratio may be 0.0625, 0.1, 0.2, 0.5, 0.7 or 0.9, etc.

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

[0066]

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

[0068] The unit of the area of ​​the center hole 51 is 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 surrounding frame 20 is mm.

[0069] As described above, D is the ratio of the area of ​​the center hole 51 to the area of ​​the through hole 40, so the smaller the D value is, the smaller the area of ​​the center hole 51 is relative to the area of ​​the through hole 40, that is, the greater the adjustment range of the center hole 51 to the position accuracy of the through hole 40. The larger the D value is, the larger the area of ​​the center hole 51 is relative to the area of ​​the through hole 40, that is, the smaller the adjustment range of the center hole 51 to the position accuracy of the through hole 40.

[0070] Furthermore, E represents the length of the weld between the connecting beam 30 and the surrounding frame 20. Therefore, the larger the E value is, the more likely the connecting beam 30 is to deform after welding, and a larger deformation arc may exist on the surface of the connecting beam 30. At this time, the D value can be appropriately reduced to increase the adjustment range of the position accuracy of the through hole 40 by the annular gasket 50, so that the annular gasket 50 can more easily correct the position accuracy of the through hole 40.

[0071] Furthermore, the larger the E value is, the smaller the deformation of the connecting beam 30 after welding is, and the smaller the deformation degree of the surface of the connecting beam 30 is. In this case, the D value can be appropriately increased, and the adjustment range of the position accuracy of the through hole 40 by the annular gasket 50 can be appropriately reduced, so that the annular gasket 50 can correct the position accuracy of the through hole 40. At the same time, it can also prevent the connection member from applying a large tightening force to the middle 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 center hole 51, the area of ​​the through hole 40 and the thickness d3 of the annular gasket 50 satisfy the following relationship:

[0075]

[0076] 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.

[0077] The unit of the area of ​​the center hole 51 is mm 2 , the area of ​​the through hole 40 is in mm 2 , the unit of the thickness d3 of the annular gasket 50 is mm.

[0078] from Figure 4 It can be seen that the thickness d3 of the annular gasket 50 is, that is, the size of the annular gasket 50 in a direction perpendicular to the adhesive surface of the annular gasket 50 .

[0079] First, the value of d3 cannot be too large, because if d3 is too large, the thickness of the annular gasket 50 is thicker, which will occupy more installation space. And the value of d3 cannot be too small, because if d3 is too small, the thickness of the annular gasket 50 is thinner, which will make the strength of the annular gasket 50 poor.

[0080] Secondly, as mentioned above, if the value of D is smaller, the diameter of the center hole 51 is smaller relative to the diameter of the through hole 40, and the locking force applied by the connector after the battery pack box is assembled on the frame is greater. At this time, the value of d3 should be appropriately increased to make the annular gasket 50 have a higher strength to prevent the locking force from crushing the annular gasket 50. If the value of D is larger, the diameter of the center hole 51 is larger relative to the diameter of the through hole 40, and the locking force applied by the connector after the battery pack box is assembled on the frame is smaller. At this time, the value of d3 can be appropriately reduced to make the annular gasket 50 have 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 the ratio may 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 d3 of the annular gasket 50 to the thickness d4 of the connecting beam 30 is in the range of 2 to 6.

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

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

[0086] Furthermore, the ratio of d3 to d4 cannot be too large, because if the ratio is too large, the thickness of the annular gasket 50 is thicker than the thickness of the connecting beam 30, which will occupy more installation space. And the ratio cannot be too small, because if the ratio is too small, the thickness of the annular gasket 50 is thinner than the thickness of the connecting beam 30, which will make the strength of the annular gasket 50 poor.

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

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

[0089] Furthermore, in the technical solution of this embodiment, in the axial direction of the through hole 40 , the annular gasket 50 and the through hole 40 have no overlapping portion.

[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 center hole 51 and the inner wall of the through hole 40 are staggered in the axial direction, that is, the inner wall of the center hole 51 and the inner wall of the through hole 40 have no overlapping part in the axial direction.

[0091] Furthermore, no boss structure extending into the through hole 40 is provided at the inner edge of the annular gasket 50 .

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

[0093] Specifically, after the glue enters the glue overflow groove, the contact area between the glue and the annular gasket 50 and / or the connecting beam 30 can be increased, thereby improving the bonding strength.

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

[0095] Optionally, the glue overflow groove may be in any form such as annular, linear, curved, irregular, etc., as long as it can increase the contact area between the glue and the adhesive surface.

[0096] Furthermore, the depth of the overflowing glue groove cannot be too small, otherwise the effect of increasing the bonding strength is limited. Also, the depth of the overflowing glue groove cannot be too large, otherwise the structural strength of the connecting beam 30 and / or the annular gasket 50 will be weakened.

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

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

[0099] Specifically, the strength of steel is relatively high, so the strength of the connecting beam 30 can be improved, but it is more likely to undergo phase change when heated, and the longer the weld size, the greater the deformation caused by welding to the connecting beam 30, so 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 the value of C is too large, it means that the diameter d2 of the through hole 40 is small, and the assembly accuracy may not be guaranteed when the deformation degree of the connecting beam 30 is large. In addition, the value of C cannot be too small. If the value of C is too large, it means that the diameter d2 of the through hole 40 is large. Opening a through hole 40 with a large diameter on the connecting beam 30 will weaken the structural strength of the connecting beam 30, which is not conducive to the subsequent connection strength between the connecting beam 30 and the vehicle.

[0101] Therefore, preferably, when the material of the connecting beam 30 is 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 surrounding frame 20 is roll-formed, or the surrounding frame 20 is stamped.

[0104] Specifically, the deformation of the battery pack body formed by rolling or stamping during the welding process will be greater, so it is necessary to use the annular gasket 50 in this embodiment to correct the positional deviation 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 is provided around the through hole 40 , and at least a part of the annular gasket 50 is accommodated in the annular recess.

[0106] Specifically, by setting the annular depression, the height of the annular gasket 50 protruding from the surface of the connecting beam 30 can be made as small as possible while the thickness d3 of the annular gasket 50 is as large as possible, and the outer surface of the annular gasket 50 can even be flush with the surface of the connecting beam 30, thereby reducing the height space occupied by the annular gasket 50 as much as possible.

[0107] Of course, the depth of the annular recess should not be too large. If the depth of the annular recess is too large, the strength of the profile of the connecting beam 30 will be weakened.

[0108] like Figure 1 As shown, in the technical solution of this embodiment, the connecting beam 30 is a hanging ear beam, the through hole 40 is a hanging ear hole, and the annular gasket 50 and the through hole 40 are suitable for allowing the connecting member to pass through.

[0109] Optionally, the ear beam and the ear hole are used to fix the battery pack box to the bottom frame of the vehicle body, so there are high requirements for the position accuracy of the ear hole, otherwise the battery pack box may not be assembled on the frame.

[0110] Optionally, the lug beam is arranged on the side of the battery pack body.

[0111] In some embodiments not shown, the connecting beam 30 and the through hole 40 may also be used to connect with other structures, and are not limited to being connected with the bottom of the frame.

[0112] The present application also provides a battery pack. According to an embodiment of the battery pack of the present application, the battery pack includes a battery pack case and a battery pack arranged in the battery pack case, and the battery pack is the above-mentioned battery pack.

[0113] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A battery pack box, characterized in that: The battery comprises a bottom plate (10) and a surrounding frame (20) arranged around the bottom plate (10), wherein the bottom plate (10) and the surrounding frame (20) form a storage space for storing batteries, a connecting beam (30) is welded to a side of the surrounding frame (20) away from the storage space, a through hole (40) is arranged on the connecting beam (30), the axis of the through hole (40) is perpendicular to the bottom 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), and the annular gasket (50) covers part of the through hole (40), The length of the weld between the connecting beam (30) and the surrounding 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 length of the weld to the length (d1) of the surrounding 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 surrounding 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.

2. The battery pack case 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 expressed in mm. 2 The area of ​​the through hole (40) is in units of mm. 2 .

3. The battery pack case according to claim 2, characterized in that: The area of ​​the central hole (51), the area of ​​the through hole (40), and the length of the weld between the connecting beam (30) and the surrounding 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 length of the weld between the connecting beam (30) and the surrounding frame (20), and F is in the range of 0.0416 to 1.758, The area of ​​the central hole (51) is in units of mm 2 The area of ​​the through hole (40) is in units of mm 2 The unit of the weld length between the connecting beam (30) and the surrounding frame (20) is mm.

4. The battery pack case 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 units of mm 2 The area of ​​the through hole (40) is in units of mm 2 , the thickness (d3) of the annular gasket (50) is in mm.

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

6. The battery pack case according to claim 1, characterized in that: In the axial direction of the through hole (40), the annular gasket (50) and the through hole (40) have no overlapping parts.

7. The battery pack case according to claim 1, characterized in that: At least one of the surfaces of the annular gasket (50) and the connecting beam (30) that are in contact with each other is provided with a glue overflow groove, and in the axial direction along the through hole (40), the depth of the glue overflow groove is in the range of 0.2 mm to 1 mm.

8. The battery pack case according to claim 1, characterized in that: The material of the connecting beam (30) is steel, and the C is in the range of 0.3 to 16.

6.

9. The battery pack case according to claim 1, characterized in that: The surrounding frame (20) is roll-formed, or the surrounding frame (20) is stamped.

10. The battery pack case according to any one of claims 1 to 9, 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 suitable for allowing a connecting member to pass through.

11. The battery pack case according to any one of claims 1 to 9, characterized in that: An annular recess is provided on the connecting beam (30), the annular recess is arranged around the through hole (40), and at least a portion of the annular gasket (50) is accommodated in the annular recess.

12. A battery pack, characterized in that: A battery pack case and a battery group arranged in the battery pack case, wherein the battery pack case is the battery pack case according to any one of claims 1 to 11.

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