Battery box

Abstract

The utility model discloses a battery box which comprises a box body and a hanging assembly arranged outside the box body, the box body comprises a frame, and the battery box is characterized in that the hanging assembly comprises a first hanging plate, one end of the first hanging plate is provided with a first connecting part, and the first connecting part is located on the lower side of the frame; the first connecting part is fixedly welded to the bottom face of the frame through electric resistance welding, a cavity is formed in the frame, a first welding hole communicated with the cavity is formed in the top face of the frame and used for avoiding an electric resistance welding pin, and a sealing glue layer is arranged on the periphery of the welding portion of the first connecting part and the frame. The battery box is long in service life and good in quality.

Description

Technical Field

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

[0002] The battery box usually includes a box body and a mounting beam. The mounting beam is fixedly connected to the frame of the box body. The mounting beam protrudes from the outside of the frame. The mounting beam is fixed with a bushing. When in use, the bolts are passed through the mounting beam and the bushing from the bottom of the mounting beam and tightened to the vehicle body in sequence, thereby mounting the battery box on the vehicle body. In the prior art battery box, the mounting beam and the frame are fixed in the following manner: after the mounting beam and the frame form a surface abutment, the mounting beam is fixed to the frame by arc welding. However, this connection method of the mounting beam and the frame has the following shortcomings: it is impossible to form a protective film on the abutment surface of the mounting beam and the frame by electrophoresis, and the welding part of the mounting beam and the frame is prone to rust and corrosion, thereby resulting in a short service life of the battery box. Utility Model Content

[0003] The utility model aims to provide a battery box with long service life and good quality.

[0004] To achieve this purpose, the utility model adopts the following technical solutions:

[0005] A battery box is provided, comprising a box body and a mounting assembly arranged outside the box body, the box body comprising a frame, the mounting assembly comprising a first mounting plate, a first connecting portion is arranged at one end of the first mounting plate, the first connecting portion is located at the lower side of the frame, and the first connecting portion is welded and fixed to the bottom surface of the frame by resistance welding, the frame has a cavity inside, the top surface of the frame is provided with a first welding hole connected to the cavity, the first welding hole is used to avoid the resistance welding needle, and a sealing glue layer is arranged around the welding portion between the first connecting portion and the frame.

[0006] As a preferred technical solution for the battery box, the frame includes a main body and a boss connected to the bottom of the main body at an angle, the cavity is provided inside the main body and inside the boss, the cavity of the main body is connected to the cavity of the boss, the boss protrudes from the side of the main body away from the inside of the box, the first mounting plate is welded and fixed to the boss, and the first welding hole is provided on the top surface of the boss.

[0007] As a preferred technical solution of the battery box, the mounting assembly also includes a second mounting plate, which is connected to the upper side of the first mounting plate, and a second connecting portion is provided at one end of the second mounting plate, and the second connecting portion is welded and fixed to the top surface of the boss by resistance welding, and a second welding hole is provided on the bottom surface of the boss, and the second welding hole is connected to the cavity of the boss, and the second welding hole is used to avoid the resistance welding needle, and the second welding hole is staggered with the first welding hole, and the sealing glue layer is provided around the welding portion between the second connecting portion and the boss.

[0008] As a preferred technical solution of the battery box, the first connecting portion is provided with a first avoidance notch, and the first avoidance notch avoids the second welding hole;

[0009] And / or, the second connecting portion is provided with a second avoidance gap, and the second avoidance gap avoids the first welding hole.

[0010] As a preferred technical solution of the battery box, the diameter of the first welding hole is 18mm-22mm;

[0011] And / or, the diameter of the second welding hole is 18mm-22mm.

[0012] As a preferred technical solution of the battery box, the mounting assembly also includes a third mounting plate, the third mounting plate is connected to the side of the second mounting plate facing away from the first mounting plate, a third connecting portion is provided at one end of the third mounting plate, and one end of the third connecting portion is welded to the main body.

[0013] As a preferred technical solution of the battery box, the first mounting plate also includes a first substrate, one end of which is provided with the first connecting portion, the second mounting plate also includes a second substrate, one end of which is provided with the second connecting portion, the second mounting plate also includes a third substrate, one end of which is provided with the third connecting portion, and the first substrate, the second substrate and the third substrate are welded and fixed.

[0014] As a preferred technical solution of the battery box, the mounting assembly is fastened to a carrier outside the battery box by a fastener, and the mounting assembly also includes a bushing for the fastener to pass through, the bushing extends from the first base through the second base to the third base, and the bushing is respectively fixed to the first base, the second base and the third base, and the fastener passes through the bushing and is threadedly connected to the carrier.

[0015] As a preferred technical solution of the battery box, a plurality of first bulges protruding downward are arranged on the first substrate, a plurality of second bulges protruding downward are arranged on the second substrate, the second bulges correspond one-to-one to the first bulges, the first bulges are fitted and connected in the corresponding first bulges, and a third bulge protruding upward is arranged on the third substrate, the third bulges correspond one-to-one to the second bulges, the third bulges are spaced and located on the upper side of the corresponding second bulges, a cavity is formed between the third bulge and the corresponding second bulge, and the bushing extends from the first bulge through the second bulge and the cavity in sequence to the third bulge.

[0016] As a preferred technical solution of the battery box, the first base is located above the first connecting portion, the first mounting plate further includes a first transition section, and the first base is connected to the first connecting portion through the first transition section;

[0017] And / or, the second base is located above the second connecting portion, the second mounting plate further includes a second transition section, and the second base is connected to the second connecting portion via the second transition section;

[0018] And / or, the third base is located below the third connecting portion, the third mounting plate further includes a third transition section, and the third base is connected to the third connecting portion via the third transition section.

[0019] As a preferred technical solution of the battery box, the main body is provided with a plurality of protrusions protruding from one side toward the mounting assembly, and the plurality of protrusions are spaced apart along the length direction of the frame, and a connection position is formed between two adjacent protrusions. The third connection portion is welded to the connection position, and a fourth protrusion is provided at a position of the third connection portion between the two connection positions, and the protrusion abuts against the fourth protrusion.

[0020] As a preferred technical solution of the battery box, reinforcing ribs are provided in the cavity within the frame.

[0021] As a preferred technical solution of the battery box, the box body also includes a bottom guard plate arranged at the bottom of the frame, and the bottom guard plate includes a steel plate and a glass fiber layer wrapped around the outer periphery of the steel plate.

[0022] As a preferred technical solution for the battery box, at least two steel plates are provided, at least two of the steel plates are spaced apart and distributed along the same plane, and the glass limiting layer is filled between two adjacent steel plates.

[0023] As a preferred technical solution of the battery box, it also includes a liquid cooling plate. The frame, the liquid cooling plate and the bottom guard plate are arranged in sequence from top to bottom. The liquid cooling plate is connected to the bottom of the frame through the first connecting member, and the bottom guard plate is detachably connected to the liquid cooling plate through the second connecting member.

[0024] As a preferred technical solution of the battery box, the liquid cooling plate includes a flow channel portion and an abutment portion arranged around the outer periphery of the flow channel portion, the abutment portion is respectively connected to the frame and the bottom guard plate, a convex rib is arranged between the flow channel portion and the abutment portion, the convex rib protrudes from the flow channel portion, a fifth convex bump is protruding from the abutment portion, the second connecting piece passes through the bottom guard plate and is tightened in the fifth convex bump, and a sealing ring is arranged between the convex rib and the bottom guard plate.

[0025] The beneficial effects of the utility model are as follows: a sealing layer is arranged around the welding portion between the first connecting portion and the frame, and the gap between the welding portion of the first connecting portion and the frame is sealed by the sealing layer to prevent the gap between the welding portion between the first connecting portion and the frame from being exposed to air and being oxidized and corroded, thereby reducing the possibility of failure of the connection between the first mounting plate and the frame, which is beneficial to extending the service life of the battery box. In addition, the first connecting portion and the frame are fixed by resistance welding, and the sealing layer is also combined with the first connecting portion and the frame. The connection strength between the first mounting plate and the frame is enhanced by the sealing layer, so that the connection between the first mounting plate and the frame is more firmly connected, further reducing the risk of the first mounting plate falling off the frame. In addition, the heat of resistance welding is more concentrated, and the influence of the hot zone of resistance welding on the plate is smaller than that of the hot zone of arc welding. The first connecting part is welded and fixed to the bottom surface of the frame by resistance welding, and the welding process causes little damage to the first mounting plate and the frame, which is beneficial to improving the manufacturing quality of the battery box; a first welding hole connected to the cavity is set on the top surface of the frame, and when resistance welding is performed, the resistance welding needle can pass through the first welding hole and the cavity from the top of the frame in turn to contact the bottom of the frame, which makes it convenient to weld and fix the bottom of the frame to the first mounting plate, and because the first connecting part is connected to the bottom of the frame, when the box is mounted on the carrier through the mounting assembly, the first connecting part exerts an upward force on the bottom of the frame, which further prevents the first mounting plate from falling off the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The utility model is further described in detail below based on the drawings and embodiments.

[0027] Figure 1 It is a schematic diagram of the three-dimensional structure of a battery box described in an embodiment.

[0028] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0029] Figure 3 for Figure 2 Enlarged view of point B in the middle.

[0030] Figure 4 This is a schematic diagram of the connection structure between the first mount and the frame in the embodiment (the sealant layer is not shown in the figure).

[0031] Figure 5 It is a schematic diagram of the three-dimensional structure of a battery box according to another embodiment.

[0032] Figure 6 for Figure 5 Enlarged view of center C.

[0033] Figure 7 It is a schematic diagram of the three-dimensional structure of the battery box after removing the bottom guard plate described in another embodiment.

[0034] Figure 8 for Figure 7 Enlarged view of point D in the middle.

[0035] Fig. 9 Schematic diagram of the liquid cooling plate according to the embodiment.

[0036] Fig.10 for Fig. 9 Enlarged view of point E in the middle.

[0037] Fig.11 A cross-sectional view of the bottom guard plate described in the embodiment.

[0038] Fig.12 An exploded view of a battery box according to another embodiment.

[0039] Fig.13 for Fig.12 A partial enlarged view of .

[0040] In the figure:

[0041] 1. Box body; 11. Frame; 111. Main body; 1111. Protrusion; 112. Boss; 1121. First welding hole; 1122. Second welding hole; 113. Reinforcement rib; 114. Cavity; 12. Bottom guard plate; 121. Steel plate; 122. Glass fiber layer; 2. Mounting assembly; 21. First mounting plate; 211. First connecting portion; 2111. First avoidance gap; 212. First base; 2121. First convex hull; 213. First transition section; 22. Second mounting plate; 221. The second connecting part; 222, the second base; 2221, the second convex bump; 223, the second transition section; 23, the third mounting plate; 231, the third connecting part; 2311, the fourth convex bump; 232, the third base; 2321, the third convex bump; 233, the third transition section; 24, the cavity; 25, the weight-reducing hole; 3, the first connecting piece; 4, the sealing ring; 5, the second connecting piece; 6, the bushing; 7, the liquid cooling plate; 71, the flow channel part; 72, the abutting part; 721, the fifth convex bump; 73, the convex rib; 8, the sealing glue layer. DETAILED DESCRIPTION

[0042] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0043] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0045] like Figures 1 to 5 As shown, the utility model provides a battery box, including a box body 1 and a mounting assembly 2 arranged outside the box body 1, the box body 1 includes a frame 11, the mounting assembly 2 includes a first mounting plate 21, one end of the first mounting plate 21 is provided with a first connecting portion 211, the first connecting portion 211 is located at the lower side of the frame 11, and the first connecting portion 211 is welded and fixed to the bottom surface of the frame 11 by resistance welding, the frame 11 has a cavity 114 inside, the top surface of the frame 11 is provided with a first welding hole 1121 connected to the cavity 114, the first welding hole 1121 is used to avoid the resistance welding needle, the first welding hole 1121 is used to avoid the resistance welding needle, and a sealing layer 8 is provided around the welding portion between the first connecting portion 211 and the frame 11. In actual use, the mounting assembly 2 is fastened to a carrier (such as a vehicle body) by a fastener to mount the battery box 1 on the carrier.

[0046] A sealing layer 8 is provided around the welding portion between the first connecting portion 211 and the frame 11, and the gap between the welding portion between the first connecting portion 211 and the frame 11 is sealed by the sealing layer 8 to prevent the gap in the welding portion between the first connecting portion 211 and the frame 11 from being exposed to air and being oxidized and corroded, thereby reducing the possibility of failure of the connection between the first mounting plate 21 and the frame 11, which is beneficial to extending the service life of the battery box. In addition, the first connecting portion 211 and the frame 11 are fixed by resistance welding. The sealing layer 8 is also combined with the first connecting portion 211 and the frame 11, and the connection strength between the first mounting plate 21 and the frame 11 is enhanced by the sealing layer 8, so that the connection between the first mounting plate 21 and the frame 11 is more firmly connected, further reducing the risk of the first mounting plate 21 falling off from the frame 11. In addition, the heat of resistance welding is more concentrated, and the hot zone effect of resistance welding has less impact on the plate than the hot zone effect of arc welding. The first connecting portion 211 is welded and fixed to the bottom surface of the frame 11 by resistance welding. The welding process causes little damage to the first mounting plate 21 and the frame 1, which is beneficial to improving the manufacturing quality of the battery box; a first welding hole 1121 connected to the cavity 114 is provided on the top surface of the frame 11. When resistance welding is performed, the resistance welding needle can pass through the first welding hole 1121 and the cavity 24 from the top of the frame 11 in sequence to contact the bottom of the frame 11, which facilitates welding and fixing the bottom of the frame 11 to the first mounting plate 21, and because the first connecting portion 211 is connected to the bottom of the frame 11, when the box body 1 is mounted on the carrier through the mounting assembly 2, the first connecting portion 211 exerts an upward force on the bottom of the frame 11, which further prevents the first mounting plate 21 from falling off the frame 11.

[0047] In actual implementation, first apply the paste-like sealant on the part to be bonded between at least one of the first connection part 211 and the frame 11, so that the surface to be bonded between at least one of the first connection part 211 and the frame 11 is fully coated with the paste-like sealant, then dock the first connection part 211 with the frame 11, and fix the position of the first connection part 211, and pass one end of the resistance welding needle from the top of the frame 11 through the first welding hole 1121 and the cavity 114 in sequence and abut against the frame 11, and then use the resistance welding needle to extrude the frame 11, so that the part where the first connection part 211 and the frame 11 are bonded is welded and fixed, and under the action of the extrusion force, the paste-like sealant between the first connection part 211 and the frame 11 will overflow around the welding part between the first connection part 211 and the frame 11, and after the sealant is cured, a sealant layer 8 will be formed around the welding part between the first connection part 211 and the frame 11.

[0048] Reference Figures 1 to 4 The frame 11 includes a main body 111 and a boss 112 connected to the bottom of the main body 111 at an angle. The interior of the main body 111 and the interior of the boss 112 are both provided with a cavity 114. The cavity 114 of the main body 111 is connected to the cavity 114 of the boss 112. The boss 112 protrudes from the side of the main body 111 away from the interior of the box body 1. The first mounting plate 21 is welded and fixed to the boss 112, and the top surface of the boss 112 is provided with a first welding hole 1121. In this example, the boss 112 is connected to the main body 111 at an angle of 90°. In other examples, the angle between the boss 112 and the main body 111 can be flexibly adjusted as needed, for example, the angle between the boss 112 and the main body 111 is set to 30°, 60°, 120° or 150°, etc. The boss 112 is connected to the main body 111 at an angle, which is conducive to enhancing the structural strength of the frame 11, and the frame 11 and the first mounting plate 21 provide space, which is more conducive to connecting the first connection part 211 to the frame 11 through the resistance welding needle. Specifically, the welding part between the first connection part 211 and the boss 112 is covered with a sealant layer 8.

[0049] It can be understood that the battery box is mounted on the carrier through the mounting assembly 2, so the mounting assembly 2 is the main force-bearing assembly of the battery box. In order to enhance the force strength of the mounting assembly 2, refer to Figure 1 and Figure 2In one embodiment, the mounting assembly 2 further includes a second mounting plate 22, and the second mounting plate 22 is connected to the upper side of the first mounting plate 21. In this example, the second mounting plate 22 is fixed to the first mounting plate 21 by resistance welding. A second connecting portion 221 is provided at one end of the second mounting plate 22, and the second connecting portion 221 is welded and fixed to the top surface of the boss 112 by resistance welding. A second welding hole 1122 is provided on the bottom surface of the boss 112, and the second welding hole 1122 is connected to the cavity 114 of the boss 112. The second welding hole 1122 is used to avoid the resistance welding needle, and the second welding hole 1122 is staggered with the first welding hole 1121. A sealing glue layer 8 is provided around the welding portion between the second connecting portion 221 and the boss 112. By adding the second mounting plate 22 connected to the upper side of the first mounting plate 21, it is beneficial to enhance the overall structural strength of the mounting assembly 2, prevent the mounting assembly 2 from being deformed, and thus improve the load-bearing capacity of the battery box. The second connection portion 221 of the second mounting plate 22 is fixed to the top surface of the boss 112 by resistance welding, which increases the connection area between the mounting assembly 2 and the frame 11, and is conducive to improving the connection structure between the mounting assembly 2 and the frame 11. The second mounting plate 22 is welded to the top surface of the boss 112 and the first mounting plate 21 is welded to the bottom surface of the boss 112, which reduces the damage of the heat-affected zone to the frame 11, and a sealant layer 8 is set between the welding parts of the second connection portion 221 and the boss 112. The sealant layer 8 is used to prevent the welding part of the second mounting plate 22 and the frame 11 from being oxidized and corroded by the gap and contact with air, thereby reducing the possibility of failure of the connection between the second mounting plate 22 and the frame 11, and the sealant layer 8 is combined with the second connection portion 221 and the boss 112, which is conducive to enhancing the connection strength between the second mounting plate 22 and the frame 11, and further improving the connection strength between the mounting assembly 2 and the box body 1. In actual implementation, the way in which the sealant layer 8 is formed around the welding portion between the second connection portion 221 and the boss 112 is similar to the way in which the sealant layer 8 is formed around the welding portion between the first connection portion 211 and the frame 11, and the way in which the sealant layer 8 is formed around the welding portion between the second connection portion 221 and the boss 112 is not repeated here.

[0050] In one example, when the mounting assembly 2 has a second mounting plate 22, the first connection portion 211 is provided with a first avoidance notch 2111, and the first avoidance notch 2111 avoids the second welding hole 1122, so as to prevent the first mounting plate 21 from interfering with the position of the resistance welding pin when the second mounting plate 22 is welded to the frame 11. The second connection portion 221 is provided with a second avoidance notch for avoiding, and the second avoidance notch avoids the first welding hole 1121. When the second mounting plate 22 is welded to the boss 112, the resistance welding pin can be avoided through the second avoidance notch when the first mounting plate 21 is welded to the frame 11, so as to prevent the second mounting plate 22 from interfering with the position of the resistance welding pin.

[0051] In another example, only the first avoidance notch 2111 is provided on the first connection portion 211 . In this case, the first mounting plate 21 is firstly welded to the boss 112 , and then the second mounting plate 22 is welded to the boss 112 .

[0052] In another example, the second avoidance notch is only provided on the second connection portion 221 . In this case, the second mounting plate 22 is firstly welded to the boss 112 , and then the first mounting plate 21 is welded to the boss 112 .

[0053] Preferably, the hole diameter of the first welding hole 1121 is 18 mm-22 mm, for example, the hole diameter of the first welding hole 1121 may be 18 mm, 19 mm, 20 mm, 21 mm or 22 mm.

[0054] The aperture of the second welding hole 1122 is 18 mm-22 mm. For example, the aperture of the first welding hole 1121 may be 18 mm, 19 mm, 20 mm, 21 mm or 22 mm.

[0055] It is understandable that the diameter of the resistance welding pin is 16mm-20mm, and the diameter of the welding hole is set to 18mm-22mm to ensure that the resistance welding pin is avoided, and it can also prevent the opening of a welding hole with a larger aperture on the frame 11 to weaken the structural strength of the frame 11. Of course, in actual implementation, the aperture sizes of the first welding hole 1121 and the second welding hole 1122 can be flexibly set, and the aperture sizes of the first welding hole 1121 and the second welding hole 1122 are not specifically limited here.

[0056] In this embodiment, refer to Figure 1 and Figure 2 The mounting assembly 2 also includes a third mounting plate 23, which is connected to the side of the second mounting plate 22 away from the first mounting plate 21, and a third connecting portion 231 is provided at one end of the third mounting plate 23, and one end of the third connecting portion 231 is welded to the main body 111. The arrangement of the third mounting plate 23 further enhances the overall structural strength of the mounting assembly 2, and the third connecting portion 231 of the third mounting plate 23 is welded to the main body 111, thereby expanding the welding portion between the mounting plate and the frame 11, and avoiding all the mounting plates from being welded on the boss 112 of the frame 11, thereby facilitating dispersing the stress of the mounting plate on the frame 11.

[0057] In actual implementation, the third connection portion 231 is connected to the main body 111 by arc welding. The third connection portion 231 forms a line contact with the main body 111, and the contact portion between the third mounting plate 23 and the frame 11 is small. A protective film can be formed around the contact portion between the third mounting plate 23 and the frame 11 by electrophoresis. In addition, an anti-corrosion coating can be sprayed on the contact portion between the third mounting plate 23 and the frame 11 in the later stage.

[0058] Specifically, refer to Figure 1 and Figure 2 The first mounting plate 21 further includes a first base 212, and a first connection portion 211 is provided at one end of the first base 212. The second mounting plate 22 further includes a second base 222, and a second connection portion 221 is provided at one end of the second base 222. The second mounting plate 22 further includes a third base 232, and a third connection portion 231 is provided at one end of the third base 232. The first base 212, the second base 222, and the third base 232 are welded and fixed, so that the first mounting plate 21, the second mounting plate 22, and the third mounting plate 23 are combined together, which is conducive to increasing the structural strength of the mounting assembly 2 as a whole. In this example, the first base 212, the second base 222, and the third base 232 are fixed by resistance welding. In other embodiments, the three bases can also be fixed by arc welding.

[0059] In one embodiment, the mounting assembly 2 is fastened to the bearing member outside the battery box by a fastener (not shown in the figure). In this example, the fastener is a fastening bolt. The mounting assembly 2 also includes a bushing 6 for the fastener to pass through. The bushing 6 extends from the first base 212 through the second base 222 to the third base 232, and the bushing 6 is respectively fixed to the first base 212, the second base 222 and the third base 232. The fastener passes through the bushing 6 and is threadedly connected to the bearing member. The mounting assembly 2 is threadedly connected to the bearing member by the fastener to realize the detachable connection between the box 1 and the bearing member. The setting of the bushing 6 is mainly conducive to transmitting the stress of the mounting assembly 2 to the bearing member, which is conducive to the stable connection between the battery box and the bearing member. The bushing 6 is fixed to the bases of the three mounting plates respectively, so that the three mounting plates act as stress-bearing components of the mounting assembly 2, which is conducive to preventing the deformation of the mounting assembly 2.

[0060] Specifically, a plurality of first bulges 2121 protruding downward are provided on the first base 212, a plurality of second bulges 2221 protruding downward are provided on the second base 222, the second bulges 2221 correspond one-to-one to the first bulges 2121, the first bulges 2121 are cooperatively connected in the corresponding first bulges 2121, and a third bulge 2321 protruding upward is provided on the third base 232, the third bulge 2321 corresponds one-to-one to the second bulge 2221, the third bulge 2321 is located at an interval on the upper side of the corresponding second bulge 2221, a cavity 24 is formed between the third bulge 2321 and the corresponding second bulge 2221, and the bushing 6 extends from the first bulge 2121 through the second bulge 2221 and the cavity 24 to the third bulge 2321. A plurality of convex bumps are arranged on the base, so that the base has an uneven structure, which is beneficial to enhancing the overall structural strength of the mounting plate. Since the bushing 6 has a certain height, a cavity 24 is formed between the third convex bump 2321 and the corresponding second convex bump 2221. Part of the bushing 6 can be accommodated through this cavity 24 to prevent the bushing 6 from protruding from the top or bottom of the mounting component 2.

[0061] In the case where the carrier is a vehicle body and the fastener is a fastening bolt, the portion of the vehicle body used to mount the battery box is located on the upper side of the mounting assembly 2, and the fastening bolt passes through the bushing 6 from the bottom of the first mounting plate 21 and is threadedly connected to the carrier. When the fastening bolt fastens the mounting assembly 2 to the vehicle body, the nut of the fastening bolt protrudes from the bottom of the mounting assembly 2 and the nut may interfere with the portion of the vehicle body located at the bottom of the mounting assembly 2. In this embodiment, the first base 212 is arranged above the first connecting portion 211, and the first mounting plate The first mounting plate 21 also includes a first transition section 213, through which the first base 212 is connected to the first connecting portion 211. By arranging the first base 212 above the first connecting portion 211, a space for accommodating the fastening bolts is reserved at the lower side of the first base 212, thereby avoiding interference between the nuts of the fastening bolts and the vehicle body. In addition, by arranging the first base 212 above the first connecting portion 211, the first base 212 can be closer to the upper bearing member, thereby also facilitating shortening the length of the fastening bolts. Arranging the first base 212 to be connected to the first connecting portion 211 through the first transition section 213 allows the first connecting portion 211 to smoothly transition to the first base 212, thereby facilitating maintaining the overall structure of the first mounting plate 21.

[0062] Optionally, the second base 222 is located above the second connecting portion 221, and the second mounting plate 22 also includes a second transition section 223. The second base 222 is connected to the second connecting portion 221 via the second transition section 223. From bottom to top, the second transition section 223 is inclined from the second connecting portion 221 toward the second base 222, so that the second base 222 and the second connecting portion 221 are distributed one above and one below. The second transition section 223 is helpful in buffering the stress of the second base 222 and reducing the possibility of the second connecting portion 221 falling off the frame 11.

[0063] Optionally, the third base 232 is located below the third connection portion 231, and the third overload plate further includes a third transition section 233, and the third base 232 is connected to the third connection portion 231 via the third transition section 233. Specifically, the third transition section 233 is an arc-shaped structure, so that the third connection portion 231 smoothly transitions through the third transition section 233, thereby preventing the connection portion between the third base 232 and the third connection portion 231 from being broken.

[0064] In this example, refer to Figure 2 and Figure 4 The first substrate 212 , the second substrate 222 and the third substrate 232 are all provided with weight-reducing holes 25 , and the weight-reducing holes 25 of the first substrate 212 , the second substrate 222 and the third substrate 232 are directly opposite to each other.

[0065] As a preferred embodiment, referring to Figure 2 The main body 111 is provided with a plurality of protrusions 1111 protruding from one side of the mounting assembly 2. The plurality of protrusions 1111 are spaced apart along the length direction of the frame 11. A connection position is formed between two adjacent protrusions 1111. The third connection portion 231 is welded to the connection position. A fourth convex bump 2311 is provided at a position of the third connection portion 231 between the two connection positions. The protrusion 1111 abuts against the fourth convex bump 2311. The main body 111 is provided with a plurality of protrusions 1111. The plurality of protrusions 1111 can strengthen the structure of the frame 11 to a certain extent. A connection position is formed by spacing between two adjacent protrusions 1111. A welding position is reserved on the main body 111 for the third connection portion 231. In addition, the manufacturing material of the frame 11 can be saved as much as possible.

[0066] In this embodiment, the first mounting plate 21, the second mounting plate 22, the third mounting plate 23 and the frame 11 are all made of steel (for example, 780DP), and the thickness of the steel is 1.0mm-1.5mm. Among them, the frame 11 is made by rolling process, and the first mounting plate 21, the second mounting plate 22 and the third mounting plate 23 are made by stamping process.

[0067] In order to further enhance the overall structural strength of the frame 11, refer to Figure 2, a reinforcing rib 113 is provided in the cavity 114 in the frame 11. In this example, the cavity 114 in the main body 111 is provided with the reinforcing rib 113. In other examples, the reinforcing rib 113 may also be provided in the cavity 114 in the boss 112, or the reinforcing rib 113 may be provided in both the cavity 114 in the main body 111 and the cavity 114 in the boss 112. In actual implementation, the number of reinforcing ribs 113 in the cavity 114 in the frame 11 can be flexibly set as needed.

[0068] In another embodiment, referring to Figure 5 and Figure 6 The box body 1 also includes a bottom guard plate 12 arranged at the bottom of the frame 11. The bottom guard plate 12 includes a steel plate 121 and a glass fiber layer 122 wrapped around the outer periphery of the steel plate 121. The steel plate 121 and the glass fiber layer 122 are combined to form a composite structure bottom guard plate 12. Different from the structure of the bottom guard plate 12 in the prior art that adopts a pure steel plate 121, the bottom guard plate 12 of this design is lighter in weight, and less steel materials are used to make the bottom guard plate 12, which is beneficial to saving steel materials and thus beneficial to saving the cost of the bottom guard plate 12.

[0069] Preferably, refer to Fig.11 At least two steel plates 121 are provided, and at least two steel plates 121 are spaced apart along the same plane, and a glass limiting layer is filled between two adjacent steel plates 121. This design is conducive to improving the stress capacity of the bottom guard plate 12. In this example, the bottom guard plate 12 is provided with four steel plates 121, and the four steel plates 121 are evenly divided into two columns, and the two columns of steel plates 121 are spaced apart, and the same two steel plates 121 are spaced apart along the same horizontal direction.

[0070] Further, refer to Figures 7 to 10 as well as Fig.12 and Fig.13 The battery box also includes a liquid cooling plate 7, a frame 11, a liquid cooling plate 7 and a bottom guard plate 12 arranged in sequence from top to bottom, the liquid cooling plate 7 is connected to the frame 11 through a first connecting member 3, and the bottom guard plate 12 is detachably connected to the liquid cooling plate 7 through a second connecting member 5. The liquid cooling plate 7 is mainly used to cool the batteries inside the box 1, thereby enhancing the heat dissipation and cooling performance of the battery box. The bottom guard plate 12 is detachably connected to the liquid cooling plate 7 through the second connecting member 5, which is conducive to the disassembly and assembly of the bottom guard plate 12, and is easy to replace when the bottom guard plate 12 is damaged.

[0071] Optionally, the first connecting member 3 is a rivet nut.

[0072] Optionally, the second connecting member 5 is a rivet or a bolt.

[0073] Specifically, the liquid cooling plate 7 includes a flow channel portion 71 and an abutting portion 72 arranged around the outer periphery of the flow channel portion 71, the abutting portion 72 is connected to the frame 11 and the bottom guard plate 12 respectively, the flow channel portion 71 has a coolant flow channel portion 71, a convex rib 73 is arranged between the abutting portion 72, the convex rib 73 protrudes from the flow channel portion 71, the abutting portion 72 is protrudingly provided with a fifth convex bump 721, the second connecting member 5 passes through the bottom guard plate 12 and is tightened in the fifth convex bump 721, and a sealing ring 4 is arranged between the convex rib 73 and the bottom guard plate 12. The bottom guard plate 12 is tightly abutted against the convex rib 73 on the liquid cooling plate 7 through the sealing ring 4 to prevent the bottom guard plate 12 from squeezing the flow channel portion 71 and affecting the circulation of the coolant inside the flow channel portion 71, and the fifth convex bump 721 provides a position for the connection between the second connecting member 5 and the liquid cooling plate 7, so that the liquid cooling plate 7 and the bottom guard plate 12 are tightly combined, which is conducive to improving the connection strength between the liquid cooling plate 7 and the bottom guard plate 12. In this example, the width of the convex rib 73 is 8 mm. Of course, in other examples, the width of the convex rib 73 can be flexibly adjusted as needed, for example, the width of the convex rib 73 can be 7 mm, 9 mm, 10 mm, etc., and the width of the convex rib 73 is not specifically limited here.

[0074] In the description of this article, it should be understood that the terms "upper", "lower", "left", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0075] In the description of this specification, the description with reference to the terms "an embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0076] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0077] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A battery box, comprising a box body and a mounting assembly arranged outside the box body, wherein the box body comprises a frame, characterized in that The mounting assembly includes a first mounting plate, a first connecting portion is provided at one end of the first mounting plate, the first connecting portion is located at the lower side of the frame, and the first connecting portion is welded and fixed to the bottom surface of the frame by resistance welding, the frame has a cavity inside, and a first welding hole connected to the cavity is provided on the top surface of the frame, the first welding hole is used to avoid the resistance welding needle, and a sealing layer is provided around the welding portion between the first connecting portion and the frame.

2. The battery box according to claim 1, characterized in that: The frame includes a main body and a boss connected to the bottom of the main body at an angle, the cavity is provided inside the main body and inside the boss, the cavity of the main body is connected to the cavity of the boss, the boss protrudes from the side of the main body away from the inside of the box, the first mounting plate is welded and fixed to the boss, and the first welding hole is provided on the top surface of the boss.

3. The battery box according to claim 2, characterized in that: The mounting assembly also includes a second mounting plate, which is connected to the upper side of the first mounting plate, and a second connecting portion is provided at one end of the second mounting plate, and the second connecting portion is welded and fixed to the top surface of the boss by resistance welding, and a second welding hole is provided on the bottom surface of the boss, and the second welding hole is connected to the cavity of the boss, and the second welding hole is used to avoid the resistance welding needle, and the second welding hole is staggered with the first welding hole, and the sealing glue layer is provided around the welding portion between the second connecting portion and the boss.

4. The battery box according to claim 3, characterized in that: The first connecting portion is provided with a first avoidance notch, and the first avoidance notch avoids the second welding hole; And / or, the second connecting portion is provided with a second avoidance gap, and the second avoidance gap avoids the first welding hole.

5. The battery box according to claim 3, characterized in that: The aperture of the first welding hole is 18 mm-22 mm; And / or, the diameter of the second welding hole is 18mm-22mm.

6. The battery box according to claim 3, characterized in that: The mounting assembly also includes a third mounting plate, which is connected to a side of the second mounting plate facing away from the first mounting plate. A third connecting portion is provided at one end of the third mounting plate, and one end of the third connecting portion is welded to the main body.

7. The battery box according to claim 6, characterized in that: The first mounting plate also includes a first substrate, one end of which is provided with the first connecting portion, the second mounting plate also includes a second substrate, one end of which is provided with the second connecting portion, the second mounting plate also includes a third substrate, one end of which is provided with the third connecting portion, and the first substrate, the second substrate and the third substrate are welded and fixed.

8. The battery box according to claim 7, characterized in that: The mounting assembly is fastened to a carrier outside the battery box by fasteners. The mounting assembly also includes a bushing for the fastener to pass through. The bushing extends from the first base through the second base to the third base, and the bushing is respectively fixed to the first base, the second base and the third base. The fastener passes through the bushing and is threadedly connected to the carrier.

9. The battery box according to claim 8, characterized in that: The first substrate is provided with a plurality of first bulges protruding downward, the second substrate is provided with a plurality of second bulges protruding downward, the second bulges correspond one-to-one to the first bulges, the first bulges are fitted and connected in the corresponding first bulges, the third substrate is provided with a third bulge protruding upward, the third bulge corresponds one-to-one to the second bulges, the third bulges are spaced and located on the upper side of the corresponding second bulges, a cavity is formed between the third bulge and the corresponding second bulge, and the bushing extends from the first bulge through the second bulge and the cavity to the third bulge in sequence.

10. The battery box according to claim 7, characterized in that: The first base is located above the first connecting portion, the first mounting plate further includes a first transition section, and the first base is connected to the first connecting portion through the first transition section; And / or, the second base is located above the second connecting portion, the second mounting plate further includes a second transition section, and the second base is connected to the second connecting portion via the second transition section; And / or, the third base is located below the third connecting portion, the third mounting plate further includes a third transition section, and the third base is connected to the third connecting portion via the third transition section.

11. The battery box according to claim 6, characterized in that: A plurality of protrusions are provided on one side of the main body protruding toward the mounting assembly, and the plurality of protrusions are spaced apart along the length direction of the frame, and a connection position is formed between two adjacent protrusions. The third connection portion is welded to the connection position, and a fourth protrusion is provided at a position of the third connection portion between the two connection positions, and the protrusion abuts against the fourth protrusion.

12. The battery box according to any one of claims 1 to 11, characterized in that: Reinforcing ribs are arranged in the cavity within the frame.

13. The battery box according to any one of claims 1 to 11, characterized in that: The box body also includes a bottom guard plate arranged at the bottom of the frame, and the bottom guard plate includes a steel plate and a glass fiber layer wrapped around the outer periphery of the steel plate.

14. The battery box according to claim 13, characterized in that: At least two of the steel plates are provided, and at least two of the steel plates are spaced apart and distributed along the same plane, and the glass fiber layer is filled between two adjacent steel plates.

15. The battery box according to claim 13, characterized in that: It also includes a liquid cooling plate. The frame, the liquid cooling plate and the bottom guard plate are arranged in sequence from top to bottom. The liquid cooling plate is connected to the bottom of the frame through a first connecting member, and the bottom guard plate is detachably connected to the liquid cooling plate through a second connecting member.

16. The battery box according to claim 15, characterized in that: The liquid cooling plate includes a flow channel portion and an abutment portion arranged around the outer periphery of the flow channel portion, the abutment portion is respectively connected to the frame and the bottom guard plate, a convex rib is arranged between the flow channel portion and the abutment portion, the convex rib protrudes from the flow channel portion, a fifth convex bump is protruding from the abutment portion, the second connecting piece passes through the bottom guard plate and is tightened in the fifth convex bump, and a sealing ring is arranged between the convex rib and the bottom guard plate.

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