Battery box

Abstract

A battery box, comprising a housing (1) and mounting assemblies (2). The housing (1) comprises a frame (11). Each mounting assembly (2) comprises a first mounting plate (21), a first connecting portion (211) is provided at one end of the first mounting plate (21), and the first connecting portion (211) is located on the lower side of the frame (11) and is welded to a bottom surface (110) of the frame (11) by means of electric resistance welding. Cavities (114) are formed in the frame (11), first welding holes (1121) communicated with the cavities (114) are formed in the top surface of the frame (11), the first welding holes (1121) are used for providing clearance for electric resistance welding pins, and a sealant layer (8) is provided around the welded position between each first connecting portion (211) and the frame (11).

Description

battery box

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 27, 2024, with application number 202420616915.4. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery box. Background Art

[0003] A battery box typically includes a box body and a mounting beam. The mounting beam is fixedly connected to the box body frame, protruding from the outside of the frame. A bushing is fixed to the mounting beam. During use, bolts are passed from the bottom of the mounting beam through the mounting beam and the bushing, and then tightened to the vehicle body, thereby mounting the battery box on the vehicle body. In related art battery boxes, the mounting beam and the frame are fixed by arc welding after the mounting beam is in contact with the frame. However, this method of connecting the mounting beam and the frame has the following disadvantages: a protective film cannot be formed on the contact surface of the mounting beam and the frame by electrophoresis, and the area around the welding portion of the mounting beam and the frame is prone to rust and corrosion, resulting in a short service life of the battery box. Technical Solutions

[0004] The present application provides a battery box, comprising a box body and a mounting assembly arranged on the outside of the box body, the box body comprising a frame, the mounting assembly comprising a first mounting plate, a first connecting portion being provided at one end of the first mounting plate, the first connecting portion being located on the lower side of the frame, and the first connecting portion being welded and fixed to the bottom surface of the frame by resistance welding, the interior of the frame having a cavity, the top surface of the frame being provided with a first welding hole communicating with the cavity, the first welding hole being used to avoid the resistance welding needle, and a sealing adhesive layer being provided around the welding portion between the first connecting portion and the frame. Beneficial effects

[0005] The beneficial effects of the present application are as follows: a sealing layer is provided 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, so as to prevent the gap in the welding portion between the first connecting portion and the frame from coming into contact with the 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, in addition to the first connecting portion and the frame being fixed by resistance welding, the sealing layer is also combined with the first connecting portion and the frame, and 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 firm, thereby reducing the risk of the first mounting plate falling off from the frame. In addition, the heat of resistance welding is more concentrated, and the impact 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 less 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 provided 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 body is mounted on the carrier through the mounting assembly, the force of the first connecting part on the bottom of the frame is upward, thereby preventing the first mounting plate from falling off the frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] FIG1 is a schematic diagram of the three-dimensional structure of a battery box according to an embodiment of the present application;

[0007] Figure 2 is an enlarged view of point A in Figure 1;

[0008] Figure 3 is an enlarged view of point B in Figure 2;

[0009] FIG4 is a schematic diagram of the connection structure between the first mount and the frame according to an embodiment of the present application (the sealant layer is not shown in the figure);

[0010] FIG5 is a schematic diagram of the three-dimensional structure of a battery box according to another embodiment of the present application;

[0011] Figure 6 is an enlarged view of point C in Figure 5;

[0012] FIG7 is a schematic diagram of the three-dimensional structure of a battery box with the bottom guard plate removed according to another embodiment of the present application;

[0013] Figure 8 is an enlarged view of point D in Figure 7;

[0014] FIG9 is a structural diagram of a liquid cooling plate according to an embodiment of the present application;

[0015] Figure 10 is an enlarged view of point E in Figure 9;

[0016] FIG11 is a cross-sectional view of a bottom guard plate according to an embodiment of the present application;

[0017] FIG12 is an exploded view of a battery box according to another embodiment of the present application;

[0018] FIG13 is a partial enlarged view of FIG12;

[0019] FIG14 is a partial schematic diagram of a battery box according to an embodiment of the present application.

[0020] In the picture:

[0021] 1. Box body; 11. Frame; 110. Bottom surface; 111. Main body; 1110. Connection position; 1111. Protrusion; 112. Boss; 1121. First welding hole; 1122. Second welding hole; 113. Reinforcement rib; 114. Cavity; 1141. First sub-cavity; 1142. Second sub-cavity; 12. Bottom guard plate; 121. Steel plate; 122. Fiberglass layer; 2. Mounting assembly; 21. First mounting plate; 210. Welding position; 211. First connection portion; 2111. First avoidance gap; 2112. Second avoidance gap; 212. First base; 2121. First convex hull; 2 13. First transition section; 22. Second mounting plate; 220. Welding position; 221. Second connection portion; 222. Second base; 2221. Second convex bump; 223. Second transition section; 23. Third mounting plate; 231. Third connection portion; 2311. Fourth convex bump; 232. Third base; 2321. Third convex bump; 233. Third transition section; 24. Cavity; 25. Weight reduction hole; 3. First connecting member; 4. Sealing ring; 5. Second connecting member; 6. Bushing; 7. Liquid cooling plate; 71. Flow channel portion; 72. Abutment portion; 721. Fifth convex bump; 73. Raised rib; 8. Sealant layer; 9. Fastener. Modes for Carrying Out the Invention

[0022] As shown in Figures 1 to 5, an embodiment of the present application provides a battery box, comprising a box body 1 and a mounting assembly 2 disposed on the outside of the box body 1. The box body 1 includes a frame 11, and 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 on the lower side of the frame 11 and is welded and fixed to the bottom surface 110 of the frame 11 by resistance welding. The frame 11 has a cavity 114 inside, and the top surface of the frame 11 is provided with a first welding hole 1121 that communicates with the cavity 114. The first welding hole 1121 is used to avoid the resistance welding needle. A sealing layer 8 is provided around the welding portion 210 between the first connecting portion 211 and the frame 11. In actual use, as shown in Figure 14, the mounting assembly 2 is fastened to a carrier (e.g., a vehicle body) by a fastener 9 to mount the battery box 1 on the carrier.

[0023] A sealing layer 8 is provided around the welding portion 210 between the first connection portion 211 and the frame 11, and the sealing layer 8 is used to seal the gap between the welding portion 210 between the first connection portion 211 and the frame 11, so as to prevent the welding portion 210 between the first connection portion 211 and the frame 11 from being exposed to the air due to the gap 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, in addition to the first connection portion 211 and the frame 11 being fixed by resistance welding, the sealing layer 8 is also combined with the first connection 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 firm, thereby 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 impact of the hot zone of resistance welding on the plate is smaller than that of the hot zone of arc welding. The first connecting portion 211 is welded and fixed to the bottom surface 110 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 turn to contact the bottom of the frame 11, which makes it convenient to weld and fix the bottom of the frame 11 to the first mounting plate 21, and since 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 force of the first connecting portion 211 on the bottom of the frame 11 is upward, thereby preventing the first mounting plate 21 from falling off the frame 11.

[0024] During actual implementation, a paste-like sealant is first applied to the surface of at least one of the first connection part 211 and the frame 11 to be bonded, so that the surface of at least one of the first connection part 211 and the frame 11 to be bonded is fully coated with the paste-like sealant. Then, the first connection part 211 is docked with the frame 11, and the position of the first connection part 211 is fixed at the same time. After one end of the resistance welding needle is passed through the first welding hole 1121 and the cavity 114 from the top of the frame 11 and abutted against the frame 11, the resistance welding needle is used to squeeze the frame 11 so that the portion where the first connection part 211 and the frame 11 are bonded is welded and fixed. 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 portion 210 of the first connection part 211 and the frame 11. After the sealant is cured, a sealant layer 8 will be formed around the welding portion 210 of the first connection part 211 and the frame 11.

[0025] 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. A first sub-cavity 1141 is provided inside the main body 111, and a second sub-cavity 1142 is provided inside the boss 112. The first sub-cavity 1141 and the second sub-cavity 1142 are connected to form a cavity 114. The boss 112 protrudes from the side of the main body 111 facing away from the interior of the box body 1. The first mounting plate 21 is welded and fixed to the boss 112, and a first welding hole 1121 is provided on the top surface of the boss 112. In this example, the boss 112 is connected to the main body 111 at a 90-degree angle. 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 angled connection between the boss 112 and the main body 111 helps enhance the structural strength of the frame 11. Furthermore, the space provided between the frame 11 and the first mounting plate 21 facilitates the connection of the first connecting portion 211 to the frame 11 via resistance welding pins. Specifically, a sealant layer 8 is provided around the welded portion 210 between the first connecting portion 211 and the boss 112.

[0026] It is understandable 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-bearing strength of the mounting assembly 2, referring to Figures 1 and 2, in one embodiment, the mounting assembly 2 also includes a second mounting plate 22, which 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. The bottom surface 110 of the boss 112 is provided with a second welding hole 1122, and the second welding hole 1122 is connected to the second sub-cavity 1142 of the boss 112. The second welding hole 1122 is used to avoid the resistance welding needle. The second welding hole 1122 is staggered with the first welding hole 1121. A sealing layer 8 is provided around the welding position 220 between the second connecting portion 221 and the boss 112. The addition of a second mounting plate 22 connected to the upper side of the first mounting plate 21 enhances the overall structural strength of the mounting assembly 2, preventing deformation and thereby improving the load-bearing capacity of the battery box. The second connecting portion 221 of the second mounting plate 22 is fixed to the top surface of the boss 112 via resistance welding, increasing the connection area between the mounting assembly 2 and the frame 11 and improving the structural connection between the mounting assembly 2 and the frame 11. The second mounting plate 22 is welded to the top surface of the boss 112 while the first mounting plate 21 is welded to the bottom surface 110 of the boss 112, thereby reducing the damage of the heat-affected zone to the frame 11, and a sealing layer 8 is provided between the second connecting portion 221 and the welding position 220 of the boss 112. The sealing layer 8 prevents the welding portion of the second mounting plate 22 and the frame 11 from being exposed to air due to gaps and being oxidized and corroded, thereby reducing the possibility of failure of the connection between the second mounting plate 22 and the frame 11. The sealing layer 8 is combined with the second connecting portion 221 and the boss 112, which is beneficial to enhancing the connection strength between the second mounting plate 22 and the frame 11 and 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 position 220 between the second connection part 221 and the boss 112 is similar to the way in which the sealant layer 8 is formed around the welding position 210 between the first connection part 211 and the frame 11. The way in which the sealant layer 8 is formed around the welding position 220 between the second connection part 221 and the boss 112 is not repeated here.

[0027] In one example, when the mounting assembly 2 includes a second mounting plate 22, the first connecting portion 211 is provided with a first avoidance notch 2111. The first avoidance notch 2111 avoids the second welding hole 1122, preventing 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 connecting portion 221 is provided with a second avoidance notch 2112. The second avoidance notch 2112 is used to avoid the first welding hole 1121. When the second mounting plate 22 is welded to the boss 112, the second avoidance notch 2112 can avoid the resistance welding pin when the first mounting plate 21 is welded to the frame 11, thereby preventing the second mounting plate 22 from interfering with the position of the resistance welding pin.

[0028] In another example, a first avoidance notch 2111 is provided on the first connection portion 211 . In this case, the first mounting plate 21 is first welded to the boss 112 , and then the second mounting plate 22 is welded to the boss 112 .

[0029] In another example, a second avoidance notch 2112 is provided on the second connection portion 221 . In this case, the second mounting plate 22 is first welded to the boss 112 , and then the first mounting plate 21 is welded to the boss 112 .

[0030] In one embodiment, the first welding hole 1121 has a diameter of 18 mm to 22 mm, for example, the hole of the first welding hole 1121 can be 18 mm, 19 mm, 20 mm, 21 mm, or 22 mm. The second welding hole 1122 has a diameter of 18 mm to 22 mm, for example, the hole of the first welding hole 1121 can be 18 mm, 19 mm, 20 mm, 21 mm, or 22 mm.

[0031] It is understood that the diameter of the resistance welding needle is 16mm-20mm, and the diameter of the welding hole is set to

[0032] The 18mm-22mm diameter ensures that resistance welding pins are avoided and also prevents the opening of welding holes with larger diameters on the frame 11 from weakening the structural strength of the frame 11. Of course, in actual implementation, the diameters of the first welding hole 1121 and the second welding hole 1122 can be flexibly set, and no specific limitation is imposed on the diameters of the first welding hole 1121 and the second welding hole 1122.

[0033] In this embodiment, referring to Figures 1 and 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. 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 mounting plates being concentratedly welded on the boss 112 of the frame 11, which is beneficial to dispersing the stress of the mounting plate on the frame 11.

[0034] 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. The contact area between the third mounting plate 23 and the frame 11 is small. A protective film can be formed around the contact area between the third mounting plate 23 and the frame 11 by electrophoresis. In addition, an anti-corrosion coating can be sprayed on the contact area between the third mounting plate 23 and the frame 11 at a later stage.

[0035] Specifically, referring to Figures 1 and 2, the first mounting plate 21 further includes a first base 212, with a first connection portion 211 disposed at one end of the first base 212. The second mounting plate 22 further includes a second base 222, with a second connection portion 221 disposed at one end of the second base 222. The second mounting plate 22 further includes a third base 232, with a third connection portion 231 disposed at one end of the third base 232. The first base 212, the second base 222, and the third base 232 are welded together, thereby combining the first mounting plate 21, the second mounting plate 22, and the third mounting plate 23, thereby increasing the overall structural strength of the mounting assembly 2. In this example, the first base 212, the second base 222, and the third base 232 are welded together by resistance welding. In other embodiments, the three bases may also be welded together by arc welding.

[0036] In one embodiment, as shown in FIG14 , the mounting assembly 2 is fastened to a support member outside the battery box by a fastener 9. In this example, the fastener 9 is a fastening bolt. The mounting assembly 2 also includes a bushing 6 for the fastener 9 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 fixed to the first base 212, the second base 222, and the third base 232 respectively. The fastener 9 passes through the bushing 6 and is threadedly connected to the support member. The mounting assembly 2 is threadedly connected to the support member by the fastener 9 to achieve a detachable connection between the box 1 and the support member. The provision of the bushing 6 is mainly to facilitate the transmission of the stress of the mounting assembly 2 to the support member, which is conducive to the stable connection between the battery box and the support member. The bushing 6 is fixed to the base 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 deformation of the mounting assembly 2.

[0037] Specifically, a plurality of downwardly protruding first bumps 2121 are provided on the first base 212, and a plurality of downwardly protruding second bumps 2221 are provided on the second base 222. The second bumps 2221 correspond one-to-one to the first bumps 2121, and the first bumps 2121 are fitted and connected in the corresponding first bumps 2121. A third upwardly protruding third bump 2321 is provided on the third base 232. The third bump 2321 corresponds one-to-one to the second bump 2221, and the third bump 2321 is spaced apart and located on the upper side of the corresponding second bump 2221. A cavity 24 is formed between the third bump 2321 and the corresponding second bump 2221, and the bushing 6 extends from the first bump 2121 through the second bump 2221 and the cavity 24 to the third bump 2321. A plurality of convex bumps are provided 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.

[0038] In the case where the carrier is a vehicle body and the fastener 9 is a fastening bolt, the vehicle body is used to mount the battery box.

[0039] The part is located on the upper side of the mounting assembly 2, and the fastening bolt passes through the bushing 6 at the bottom of the first mounting plate 21 and is threadedly connected to the bearing member. 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 position 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 21 also includes a first transition section 213. The first base 212 is connected to the first connecting portion 211 through the first transition section 213. By arranging the first base 212 above the first connecting portion 211, space for accommodating the fastening bolt is reserved on the lower side of the first base 212, thereby avoiding interference between the nut of the fastening bolt and the vehicle body. In addition, by arranging the first base 212 above the first connecting portion 211, the first base 212 can be made closer to the bearing member above, which is also conducive to shortening the length of the fastening bolt. The first base 212 is connected to the first connecting portion 211 via the first transition section 213 , so that the first connecting portion 211 smoothly transitions to the first base 212 , which is beneficial for maintaining the overall structure of the first mounting plate 21 .

[0040] In one embodiment, 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 through 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.

[0041] In one embodiment, the third base 232 is located below the third connecting portion 231. The third overload plate further includes a third transition section 233, through which the third base 232 is connected to the third connecting portion 231. Specifically, the third transition section 233 has an arc-shaped structure, which allows for a smooth transition of the third connecting portion 231 through the third transition section 233, thereby preventing breakage at the connection between the third base 232 and the third connecting portion 231.

[0042] In this example, referring to FIG. 2 and FIG. 4 , the first base 212 , the second base 222 and the third base 232 are all provided with weight-reducing holes 25 , and the weight-reducing holes 25 of the first base 212 , the second base 222 and the third base 232 are opposite to each other.

[0043] In one embodiment, referring to FIG2 , a plurality of protrusions 1111 are provided on one side of the main body 111 facing the mounting assembly 2. The plurality of protrusions 1111 are spaced apart along the length of the frame 11. A connection position 1110 is formed between two adjacent protrusions 1111. The third connection portion 231 is welded to the connection position 1110. A fourth convex bump 2311 is provided on the third connection portion 231 between the two connection positions 1110. The protrusion 1111 abuts against the fourth convex bump 2311. The plurality of protrusions 1111 provided on the main body 111 can strengthen the structure of the frame 11 to a certain extent. The connection position 1110 is formed by spacing between two adjacent protrusions 1111. A welding area is reserved on the main body 111 for the third connection portion 231. This can also save as much material as possible for the frame 11.

[0044] 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 (e.g., 780DP) with a thickness of 1.0 mm to 1.5 mm. The frame 11 is manufactured using a roll forming process, while the first mounting plate 21, the second mounting plate 22, and the third mounting plate 23 are manufactured using a stamping process.

[0045] In order to enhance the overall structural strength of the frame 11, referring to FIG2 , a reinforcing rib 113 is provided in the cavity 114 within the frame 11. In this example, the first sub-cavity 1141 within the main body 111 is provided with the reinforcing rib 113. In other examples, the second sub-cavity 1142 within the boss 112 may also be provided with the reinforcing rib 113, or the first sub-cavity 1141 within the main body 111 and the second sub-cavity 1142 within the boss 112 may both be provided with the reinforcing rib 113. In actual implementation, the number of reinforcing ribs 113 in the cavity 114 within the frame 11 can be flexibly set as needed.

[0046] In another embodiment, referring to Figures 5 and 6, the box body 1 also includes a bottom guard plate 12 arranged at the bottom of the frame 11, and 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 of the bottom guard plate 12. Different from the related technology in which the bottom guard plate 12 adopts the structure of pure steel plate 121, the bottom guard plate 12 of this design is lighter, and less steel material is used to make the bottom guard plate 12, which is beneficial to saving steel material and thus helping to save the cost of the bottom guard plate 12.

[0047] In one embodiment, referring to FIG11 , at least two steel plates 121 are provided. These at least two steel plates 121 are spaced apart along the same plane, and a glass-limiting layer is placed between adjacent steel plates 121. This design helps improve the strain resistance of the bottom guard plate 12. In this example, the bottom guard plate 12 is provided with four steel plates 121, which are evenly divided into two columns. The steel plates 121 in the two columns are spaced apart, and the two steel plates 121 in the same column are spaced apart along the same horizontal direction.

[0048] In one embodiment, referring to Figures 7 to 10 and Figures 12 and 13 , the battery box further comprises a liquid cooling plate 7 , a frame 11 , the liquid cooling plate 7 , and a bottom guard plate 12 , arranged sequentially from top to bottom. The liquid cooling plate 7 is connected to the frame 11 via a first connector 3 , and the bottom guard plate 12 is detachably connected to the liquid cooling plate 7 via a second connector 5 . The liquid cooling plate 7 is primarily used to cool the batteries within the box 1 , thereby enhancing the heat dissipation and cooling performance of the battery box. The detachable connection of the bottom guard plate 12 to the liquid cooling plate 7 via the second connector 5 facilitates assembly and disassembly of the bottom guard plate 12 , making it easier to replace it if damaged.

[0049] In one embodiment, the first connecting member 3 is a rivet nut.

[0050] In one embodiment, the second connecting member 5 is a rivet or a bolt.

[0051] Specifically, the liquid cooling plate 7 includes a flow channel portion 71 and an abutment portion 72 disposed around the outer periphery of the flow channel portion 71. The abutment portion 72 is connected to the frame 11 and the bottom guard plate 12, respectively. The flow channel portion 71 has a rib 73 disposed between the abutment portion 72 and the flow channel portion 71, through which the coolant flows. The rib 73 protrudes from the flow channel portion 71, and a fifth bump 721 protrudes from the abutment portion 72. The second connector 5 passes through the bottom guard plate 12 and is tightened into the fifth bump 721. A sealing ring 4 is disposed between the rib 73 and the bottom guard plate 12. The bottom guard plate 12 abuts against the rib 73 on the liquid cooling plate 7 via the sealing ring 4, preventing the bottom guard plate 12 from squeezing against the flow channel portion 71 and affecting the flow of coolant within the flow channel portion 71. The fifth bump 721 provides a location for the second connector 5 to connect to the liquid cooling plate 7, ensuring a tight connection between the liquid cooling plate 7 and the bottom guard plate 12, thereby improving the strength of the connection between the two. In this example, the width of the rib 73 is 8 mm. Of course, in other examples, the width of the rib 73 can be flexibly adjusted as needed, for example, the width of the rib 73 can be 7 mm, 9 mm, 10 mm, etc., and the width of the rib 73 is not specifically limited here.

Claims

1. A battery box, comprising a box body and a mounting assembly arranged on the outside of the box body, the box body including a frame, the mounting assembly including a first mounting plate, the first mounting plate being provided with a first connecting portion, the first connecting portion being located on the lower side of the frame, and the first connecting portion being welded and fixed to the bottom surface of the frame by resistance welding, the interior of the frame having a cavity, the top surface of the frame being provided with a first welding hole communicating with the cavity, the first welding hole being used to avoid a resistance welding needle, and a sealing adhesive layer being provided around the welding portion between the first connecting portion and the frame.

2. The battery box according to claim 1, wherein: 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, wherein: The mounting assembly also includes a second mounting plate, which is connected to the upper side of the first mounting plate. The second mounting plate is provided with a second connecting portion, which is welded and fixed to the top surface of the boss by resistance welding. The bottom surface of the boss is provided with a second welding hole, which is connected to the cavity of the boss. The second welding hole is used to avoid the resistance welding needle. The second welding hole and the first welding hole are staggered, and the sealing glue layer is provided around the welding position of the second connecting portion and the boss.

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

6. The battery box according to claim 3, wherein: The mounting assembly also includes a third mounting plate, which 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.

7. The battery box according to claim 6, wherein: The first mounting plate also includes a first base, the first base is provided with the first connecting portion, the second mounting plate also includes a second base, the second base is provided with the second connecting portion, the second mounting plate also includes a third base, the third base is provided with the third connecting portion, and the first base, the second base and the third base are welded and fixed.

8. The battery box according to claim 7, wherein: The mounting assembly is fastened to a carrier outside the battery box by a fastener. 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, wherein: A plurality of downwardly protruding first bulges are provided on the first base, a plurality of downwardly protruding second bulges are provided on the second base, the second bulges correspond one-to-one to the first bulges, and the first bulges are fitted and connected in the corresponding first bulges. A third upwardly protruding third bulge is provided on the third base, the third bulge corresponds one-to-one to the second bulges, and 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.

10. The battery box according to claim 7, wherein: The first base is located above the first connecting portion, and the first mounting plate further includes a first transition section, and the first base is connected to the first connecting portion via 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, wherein: The main body is provided with a plurality of protrusions protruding from one side toward the mounting component, 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 located 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, wherein: Reinforcing ribs are provided in the cavity within the frame.

13. The battery box according to any one of claims 1 to 11, wherein: The box body further comprises a bottom guard plate arranged at the bottom of the frame, wherein the bottom guard plate comprises 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, wherein: At least two steel plates are provided, and 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.

15. The battery box according to claim 13 further includes a liquid cooling plate, wherein 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.

16. The battery box according to claim 15, wherein: The liquid cooling plate includes a flow channel portion and an abutting portion arranged around the outer periphery of the flow channel portion, the abutting portion is connected to the frame and the bottom guard plate respectively, a convex rib is arranged between the flow channel portion and the abutting portion, the convex rib protrudes from the flow channel portion, and a fifth convex bump is protruding from the abutting 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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