Die-casting high-strength heat preservation lower box body structure

Abstract

The utility model discloses a die-casting high-strength heat preservation lower box body structure, which relates to the technical field of battery pack box bodies, and comprises a box body frame, a water-cooling plate assembly, a heat insulation pad, a bottom protection plate and FDS tapping screws, the bottom protection plate and the heat insulation pad are spliced and assembled through glue, the bottom protection plate, the water-cooling plate assembly and the box body frame are fixedly assembled through the FDS tapping screws, and the heat insulation pad and the water-cooling plate assembly are fixedly assembled through the FDS tapping screws. The heat insulation pad is used for preventing heat from being dissipated from the bottom of the box body. The peripheral installation frames and the middle supporting cross beams are integrally formed through high-pressure die casting, welding machining forming is avoided, welding seams do not exist between the peripheral frames, the overall strength is improved by 30% compared with welding parts, and die casting forming is higher in efficiency and better in consistency compared with traditional welding forming. The heat insulation pad is integrated between the water cooling plate assembly and the bottom protection plate, heat can be effectively prevented from being transmitted out from the bottom of the box body through the heat insulation pad, heat loss of the battery pack is reduced, the heat preservation performance of the battery pack is better, and therefore it is guaranteed that the performance of the battery pack is stable in winter.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack boxes, in particular to a die-cast high-strength heat-insulating lower box structure. Background Art

[0002] After years of development, new energy vehicle technology is constantly developing and improving, and people have higher and higher requirements for battery life and safety. The box, as an important component of the battery pack, plays a very important role in it. The lighter the weight of the box, the better the strength and safety of the box, the lighter the entire battery pack and even the entire vehicle, and the safer it is.

[0003] At present, the battery packs commonly used in the market mainly include aluminum extrusion solutions. The thickness of the aluminum extrusion solution is too thick, resulting in an overall excessive weight and failing to achieve the requirement of lightweighting. In addition, the box frame is currently assembled by welding on all sides. The strength of the weld is about 30% lower than the strength of the material body, and the safety strength is relatively weak. In addition, the welding process is time-consuming, which seriously affects the production capacity of components. At the same time, the bottom of the box dissipates heat quickly and has poor thermal insulation performance, which is also an important reason why the range of new energy vehicles decreases in winter. Utility Model Content

[0004] The utility model aims to provide a die-cast high-strength heat-insulating lower box structure to solve the problems raised by the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a die-cast high-strength thermal insulation lower box structure, including a box frame, a water-cooled plate assembly, a thermal insulation pad, a bottom guard plate and FDS self-tapping screws, the bottom guard plate and the thermal insulation pad are assembled by gluing, the bottom guard plate and the water-cooled plate assembly and the box frame are fixedly assembled by FDS self-tapping screws, the thermal insulation pad is used to prevent heat from being dissipated from the bottom of the box, the box frame includes a front end frame, a left end frame, a right end frame, a rear end frame, a front end cross beam one, a front end cross beam two, a middle cross beam, a rear end cross beam, a longitudinal beam and a lifting seat, the two ends of the front end frame are respectively fixedly connected to one end of the left end frame and the right end frame, and the two ends of the rear end frame are respectively The other ends of the left end frame and the right end frame are fixedly connected, the longitudinal beam is fixedly connected to the middle part of the middle cross beam, the rear end cross beam is fixedly connected to the outer wall of the rear end frame, the two ends of the middle cross beam are respectively fixedly connected to the outer walls of the left end frame and the right end frame, one end of the longitudinal beam is fixedly connected to the outer wall of the rear end cross beam, the other end of the longitudinal beam is fixedly connected to the outer wall of the front end frame, the two ends of the front end cross beam one are respectively fixedly connected to the longitudinal beam and the outer wall of the left end frame, the two ends of the front end cross beam two are respectively fixedly connected to the longitudinal beam and the outer wall of the right end frame, and four lifting seats are provided, two of which are fixedly connected to the outer wall of the right end frame, and the other two are fixedly connected to the outer wall of the left end frame.

[0006] Preferably, the front end frame includes a sealing mounting surface, a sealing mounting hole, a side reinforcement rib and an inlet and outlet mounting hole, the sealing mounting hole is penetrated through the top surface of the sealing mounting surface, the side reinforcement rib is fixedly connected to the outer wall of the sealing mounting surface, and the inlet and outlet mounting holes are penetrated through the outer wall of the sealing mounting surface.

[0007] Preferably, the left end frame, the right end frame and the rear end frame all include a sealing mounting surface 2, a sealing mounting hole 2, a side reinforcement rib 2 and a bottom reinforcement rib, the sealing mounting hole 2 is penetrated through the top surface of the sealing mounting surface 2, the bottom reinforcement rib is fixedly connected to the outer wall of the sealing mounting surface 2, and the side reinforcement rib 2 is fixedly connected to one end of the sealing mounting surface 2.

[0008] Preferably, the front end cross beam 1 includes an expansion support surface 1 and a reinforcement rib 1, and the reinforcement rib 1 is fixedly connected to the outer wall of the expansion support surface 1. The front end cross beam 2 includes an expansion support surface 2 and a reinforcement rib 2, and the reinforcement rib 2 is fixedly connected to the outer wall of the expansion support surface 2.

[0009] Preferably, the middle cross beam includes an expansion support surface three and a reinforcement rib three, and the reinforcement rib three is fixedly connected to the inner wall of the expansion support surface three. The rear end cross beam includes an expansion support surface four and a reinforcement rib four, and one side of the reinforcement rib four is fixedly connected to the outer wall of the expansion support surface four, and the other end of the reinforcement rib four is fixedly connected to the outer wall of the rear end frame. The longitudinal beam includes an expansion support surface five and a reinforcement rib five, and the reinforcement rib five is fixedly connected to the inner wall of the expansion support surface five. The top surface of the lifting seat is provided with a mounting hole, and the bottom surface of the lifting seat is fixedly connected with a reinforcement rib six.

[0010] Preferably, the water cooling plate assembly includes a temperature equalizing plate, a flow channel plate and a water inlet and outlet, the flow channel plate is fixedly connected to the bottom surface of the temperature equalizing plate, a mounting interface is opened through the top surface of the temperature equalizing plate, the flow channel plate includes a flow channel and a mounting surface one, the mounting surface one and the temperature equalizing plate are assembled by brazing, and the water inlet and outlet and the mounting interface are formed by CMT welding.

[0011] Preferably, the thermal insulation pad is formed by foaming, and glue is provided on both the upper and lower surfaces of the thermal insulation pad. The thermal insulation pad is assembled with the water cooling plate assembly and the bottom guard plate by glue.

[0012] Preferably, the bottom guard plate includes a second mounting surface and a bottom supporting surface, the bottom supporting surface is fixedly connected to the bottom surface of the second mounting surface, and the top surface of the second mounting surface is assembled with the thermal insulation pad by gluing.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. In the utility model, the surrounding mounting frames and the middle supporting beam are integrally formed by high-pressure die-casting, so as to avoid welding and processing, so that there is no weld between the surrounding frames, and the overall strength is increased by 30% compared with welded parts. In addition, die-casting is more efficient and more consistent than traditional welding.

[0015] 2. In the utility model, by setting the third and fifth reinforcing ribs, the bending strength of the middle cross beam and the longitudinal beam is improved, so that the battery cells inside the box can be more stably supported in the later stage, so that the device has better compressive strength, and the bottom of the battery pack is better supported and protected. By setting the mounting hole and the fourth reinforcing rib, the strength of the lifting seat is improved, which is convenient for the later stable lifting and transportation of the device.

[0016] 3. In the utility model, the water inlet and outlet of the water cooling plate are sealed with the box frame by welding to ensure the sealing performance of the box. The water cooling plate assembly is assembled with thin plates, and the overall weight is light. The heat insulation pad is integrated between the water cooling plate assembly and the bottom guard plate. The heat insulation pad can effectively prevent heat from being transmitted from the bottom of the box, reduce heat loss of the battery pack, and make the thermal insulation performance of the battery pack better, thereby ensuring the stable performance of the battery pack in winter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a structural schematic diagram of a box frame of a die-cast high-strength heat-insulating lower box structure of the utility model;

[0018] Figure 2 It is a partial structural schematic diagram of the front end frame and the left end frame of a die-cast high-strength heat-insulating lower box structure of the utility model;

[0019] Figure 3 It is a partial structural schematic diagram of a die-cast high-strength heat-insulating lower box structure (16) and (110) of the utility model;

[0020] Figure 4 It is a partial structural schematic diagram of the middle cross beam and longitudinal beam of a die-cast high-strength heat-insulating lower box structure of the utility model;

[0021] Figure 5 It is a partial structural schematic diagram of a rear end cross beam of a die-cast high-strength heat-insulating lower box structure of the utility model;

[0022] Figure 6 This is a structural schematic diagram of a die-cast high-strength heat-insulating lower box structure water-cooling plate assembly of the utility model;

[0023] Figure 7 This is a structural schematic diagram of a die-cast high-strength heat-insulating lower box structure flow channel plate of the utility model;

[0024] Figure 8This is a schematic diagram of the structure of a die-cast high-strength heat-insulating lower box structure heat-insulating pad of the utility model;

[0025] Fig. 9 This is a structural schematic diagram of a die-cast high-strength heat-insulating bottom guard plate of a lower box structure of the utility model;

[0026] Fig.10 This is a structural schematic diagram of a die-cast high-strength heat-insulating lower box structure FDS self-tapping screw of the utility model;

[0027] Fig.11 It is a three-dimensional structural schematic diagram of a die-cast high-strength thermal insulation lower box structure of the utility model.

[0028] In the figure: 1, box frame; 11, front end frame; 111, sealing installation surface 1; 112, sealing installation hole 1; 113, side reinforcement rib 1; 114, inlet and outlet installation holes; 12, left end frame; 121, sealing installation surface 2; 122, sealing installation hole 2; 123, side reinforcement rib 2; 124, bottom reinforcement rib; 13, right end frame; 14, rear end frame; 15, front end beam 1; 151, expansion support surface 1; 152, reinforcement rib 1; 16, front end beam 2; 161, expansion support surface 2; 162, reinforcement rib 2; 17, middle beam; 171. Expansion support surface three; 172. Reinforcement rib three; 18. Rear end crossbeam; 181. Expansion support surface four; 182. Reinforcement rib four; 19. Longitudinal beam; 191. Expansion support surface five; 192. Reinforcement rib five; 110. Lifting seat; 1101. Mounting hole; 1102. Reinforcement rib six; 2. Water cooling plate assembly; 21. Temperature averaging plate; 211. Mounting interface; 22. Flow channel plate; 221. Flow channel; 222. Mounting surface one; 23. Water inlet and outlet; 3. Insulation pad; 4. Bottom guard plate; 41. Mounting surface two; 42. Bottom support surface; 5. FDS self-tapping screws. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the implementation regulations described 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 ordinary technicians in this field without creative work are within the scope of protection of the utility model. Embodiment 1

[0030] Reference Figure 1-11As shown: a die-cast high-strength thermal insulation lower box structure, including a box frame 1, a water-cooled plate assembly 2, an insulation pad 3, a bottom guard plate 4 and an FDS self-tapping screw 5, the bottom guard plate 4 and the insulation pad 3 are assembled by gluing, the bottom guard plate 4 and the water-cooled plate assembly 2 and the box frame 1 are fixedly assembled by FDS self-tapping screws 5, and the insulation pad 3 is used to prevent heat from radiating from the bottom of the box; the box frame 1 includes a front end frame 11, a left end frame 12, a right end frame 13, a rear end frame 14, a front end cross beam 15, a front end cross beam 2 16, a middle cross beam 17, a rear end cross beam 18, a longitudinal beam 19 and a hoisting seat 110, the two ends of the front end frame 11 are respectively fixedly connected to one end of the left end frame 12 and the right end frame 13, and the two ends of the rear end frame 14 are respectively fixedly connected to the other ends of the left end frame 12 and the right end frame 13 Fixed connection, the longitudinal beam 19 is fixedly connected to the middle part of the middle cross beam 17, the rear end cross beam 18 is fixedly connected to the outer wall of the rear end frame 14, the two ends of the middle cross beam 17 are respectively fixedly connected to the outer walls of the left end frame 12 and the right end frame 13, one end of the longitudinal beam 19 is fixedly connected to the outer wall of the rear end cross beam 18, the other end of the longitudinal beam 19 is fixedly connected to the outer wall of the front end frame 11, the two ends of the front end cross beam 15 are respectively fixedly connected to the longitudinal beam 19 and the outer wall of the left end frame 12, the two ends of the front end cross beam 2 16 are respectively fixedly connected to the longitudinal beam 19 and the outer wall of the right end frame 13, four lifting seats 110 are provided, two of which are fixedly connected to the outer wall of the right end frame 13, and the other two lifting seats 110 are fixedly connected to the outer wall of the left end frame 12, and the box frame 1 is formed by integral die casting.

[0031] In this embodiment, the box frame 1 includes a surrounding frame structure, a beam structure and a lifting seat structure; the upper end of the surrounding frame structure ensures sealed connection assembly and support, and the lower end of the surrounding frame structure ensures connection support with the water cooling plate and the bottom guard plate; the beam structure mainly ensures the expansion support of the battery cells inside the box in the later stage; the lifting seat ensures the lifting and transportation functions of the entire battery pack in the later stage, which is convenient for later installation. The surrounding installation frame and the middle supporting beam are integrally formed by high-pressure die-casting to avoid welding processing and forming, so that there are no welds between the surrounding frames, and the overall strength is 30% higher than that of welded parts, and die-casting is more efficient and consistent than traditional welding. Embodiment 2

[0032] Figure 2 - Figure 5As shown, the front end frame 11 includes a sealing installation surface 111, a sealing installation hole 112, a side reinforcing rib 113 and an inlet and outlet installation hole 114. The sealing installation hole 112 penetrates and is opened on the top surface of the sealing installation surface 111. The side reinforcing rib 113 is fixedly connected to the outer wall of the sealing installation surface 111. The inlet and outlet installation hole 114 penetrates and is opened on the outer wall of the sealing installation surface 111. The left end frame 12, the right end frame 13 and the rear end frame 14 all include a sealing installation surface 121, a sealing installation hole 122, a side reinforcing rib 123 and a bottom reinforcing rib 124. The sealing installation hole 122 penetrates and is opened on the top surface of the sealing installation surface 121. The bottom reinforcing rib 124 is fixedly connected to the outer wall of the sealing installation surface 121. The side reinforcing rib 123 is fixedly connected to one end of the sealing installation surface 121. The front end cross beam 15 includes an expansion support surface 151 and a reinforcing rib 152. The reinforcing rib 152 is fixedly connected to the outer wall of the expansion support surface 151, the front end cross beam 16 includes the expansion support surface 161 and the reinforcing rib 162, the reinforcing rib 162 is fixedly connected to the outer wall of the expansion support surface 161, the middle cross beam 17 includes the expansion support surface 3 171 and the reinforcing rib 3 172, the reinforcing rib 3 172 is fixedly connected to the inner wall of the expansion support surface 3 171, the rear end cross beam 18 includes the expansion support surface 4 181 and the reinforcing rib 4 182, one side of the reinforcing rib 4 182 is fixedly connected to the outer wall of the expansion support surface 4 181, and the other end of the reinforcing rib 4 182 is fixedly connected to the outer wall of the rear end frame 14, the longitudinal beam 19 includes the expansion support surface 5 191 and the reinforcing rib 5 192, the reinforcing rib 5 192 is fixedly connected to the inner wall of the expansion support surface 5 191, the top surface of the lifting seat 110 is penetrated by a mounting hole 1101, and the bottom surface of the lifting seat 110 is fixedly connected with the reinforcing rib 6 1102.

[0033] In this embodiment, by setting the reinforcing ribs, the overall strength of the surrounding frame structure, the beam structure and the lifting seat structure is effectively improved. By setting the reinforcing rib three 172 and the reinforcing rib five 192, the bending strength of the middle beam 17 and the longitudinal beam 19 is improved, so that the battery cells inside the box can be more stably supported in the later stage, and the device has better compressive strength, and the bottom of the battery pack is better supported and protected. By setting the mounting hole 1101 and the reinforcing rib six 1102, the strength of the lifting seat 110 is improved, which facilitates the stable lifting and transportation of the device in the later stage. Embodiment 3

[0034] according to Figure 6-11As shown, the water cooling plate assembly 2 includes a temperature equalizing plate 21, a flow channel plate 22 and a water inlet and outlet 23. The flow channel plate 22 is fixedly connected to the bottom surface of the temperature equalizing plate 21. A mounting interface 211 is provided on the top surface of the temperature equalizing plate 21. The flow channel plate 22 includes a flow channel 221 and a mounting surface 1 222. The mounting surface 1 222 and the temperature equalizing plate 21 are assembled and formed by brazing. The water inlet and outlet 23 and the mounting interface 211 are formed by CMT welding. The thermal insulation pad 3 is formed by foaming. Glue is provided on the upper and lower surfaces of the thermal insulation pad 3. The thermal insulation pad 3 is assembled with the water cooling plate assembly 2 and the bottom guard plate 4 by glue. The bottom guard plate 4 includes a mounting surface 2 41 and a bottom supporting surface 42. The bottom supporting surface 42 is fixedly connected to the bottom surface of the mounting surface 2 41. The top surface of the mounting surface 2 41 and the thermal insulation pad 3 are assembled by glue.

[0035] In this embodiment, the water inlet and outlet 23 of the water cooling plate are sealed to the box frame 1 by welding to ensure the sealing performance of the box. The water cooling plate assembly 2 is assembled with thin plates and has a light overall weight. The thermal insulation pad 3 is integrated between the water cooling plate assembly 2 and the bottom guard plate 4. The thermal insulation pad 3 can effectively prevent heat from being transmitted from the bottom of the box, reduce heat loss of the battery pack, and improve the thermal insulation performance of the battery pack, thereby ensuring the stable performance of the battery pack in winter. In order to ensure the structural strength and safety of the bottom of the box and meet the requirements of stone impact, the bottom guard plate 4 is assembled at the bottom of the box. The bottom guard plate 4 is made of steel material and has high structural strength.

[0036] The use method and working principle of the device are as follows: the box frame 1 is formed by one-piece die casting, and the box includes a bottom mounting surface, surrounding frames, and an intermediate crossbeam 17 and a longitudinal beam 19; then the box frame 1 is inverted on the mounting table, and the water-cooled plate is positioned on the bottom mounting surface of the box frame 1 by means of a tool; then the adhesive sticker on the back of the thermal insulation pad 3 is torn off, and the thermal insulation pad 3 is assembled on the bottom of the water-cooled plate by means of a tool, and fixed by glue; then the bottom guard plate 4 is installed on the bottom of the thermal insulation pad 3 by means of a tool; then FDS self-tapping screws 5 are assembled around and in the middle reserved positions of the bottom guard plate 4, and the lower box is assembled, and the surrounding mounting frames and the intermediate supporting crossbeam are formed as a whole by high-pressure die casting, and there are no welds between the surrounding frames, and the overall strength is increased by 30% compared with welded parts; die casting is more efficient and more consistent than traditional welding; the water-cooled plate assembly is assembled using thin plates, and the overall weight is lighter; the thermal insulation pad is integrated between the water-cooled plate assembly and the bottom guard plate, which can effectively prevent heat from being transmitted from the bottom of the box, thereby improving the thermal insulation performance of the battery pack.

[0037] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A die-cast high-strength heat-insulating lower box structure, characterized in that: It comprises a box frame (1), a water-cooling plate assembly (2), a heat-insulating pad (3), a bottom guard plate (4) and FDS self-tapping screws (5), wherein the bottom guard plate (4) and the heat-insulating pad (3) are assembled by gluing, and the bottom guard plate (4) and the water-cooling plate assembly (2) and the box frame (1) are fixedly assembled by FDS self-tapping screws (5), and the heat-insulating pad (3) is used to prevent heat from being dissipated from the bottom of the box; The box frame (1) comprises a front end frame (11), a left end frame (12), a right end frame (13), a rear end frame (14), a front end cross beam 1 (15), a front end cross beam 2 (16), an intermediate cross beam (17), a rear end cross beam (18), a longitudinal beam (19) and a lifting seat (110), wherein two ends of the front end frame (11) are respectively fixedly connected to one end of the left end frame (12) and the right end frame (13), and two ends of the rear end frame (14) are respectively fixedly connected to the other end of the left end frame (12) and the right end frame (13), and the longitudinal beam (19) is fixedly connected to the middle part of the intermediate cross beam (17), and the rear end cross beam (18) is fixedly connected to the outer wall of the rear end frame (14), and the intermediate cross beam (17) is fixedly connected to the outer wall of the rear end frame (14). ) are respectively fixedly connected to the outer walls of the left end frame (12) and the right end frame (13); one end of the longitudinal beam (19) is fixedly connected to the outer wall of the rear end cross beam (18); the other end of the longitudinal beam (19) is fixedly connected to the outer wall of the front end frame (11); the two ends of the front end cross beam 1 (15) are respectively fixedly connected to the longitudinal beam (19) and the outer wall of the left end frame (12); the two ends of the front end cross beam 2 (16) are respectively fixedly connected to the longitudinal beam (19) and the outer wall of the right end frame (13); four hanging seats (110) are provided, two of which are fixedly connected to the outer wall of the right end frame (13), and the other two of which are fixedly connected to the outer wall of the left end frame (12).

2. The die-cast high-strength heat-insulating lower box structure according to claim 1, characterized in that: The front end frame (11) comprises a sealing installation surface (111), a sealing installation hole (112), a side reinforcing rib (113) and an inlet and outlet installation hole (114); the sealing installation hole (112) is formed through the top surface of the sealing installation surface (111); the side reinforcing rib (113) is fixedly connected to the outer wall of the sealing installation surface (111); and the inlet and outlet installation holes (114) are formed through the outer wall of the sealing installation surface (111).

3. The die-cast high-strength heat-insulating lower box structure according to claim 1, characterized in that: The left end frame (12), the right end frame (13) and the rear end frame (14) all include a second sealing installation surface (121), a second sealing installation hole (122), a second side reinforcing rib (123) and a bottom reinforcing rib (124); the second sealing installation hole (122) is formed through the top surface of the second sealing installation surface (121); the bottom reinforcing rib (124) is fixedly connected to the outer wall of the second sealing installation surface (121); and the second side reinforcing rib (123) is fixedly connected to one end of the second sealing installation surface (121).

4. The die-cast high-strength heat-insulating lower box structure according to claim 1, characterized in that: The front end cross beam 1 (15) includes an expansion support surface 1 (151) and a reinforcing rib 1 (152), wherein the reinforcing rib 1 (152) is fixedly connected to the outer wall of the expansion support surface 1 (151), and the front end cross beam 2 (16) includes an expansion support surface 2 (161) and a reinforcing rib 2 (162), wherein the reinforcing rib 2 (162) is fixedly connected to the outer wall of the expansion support surface 2 (161).

5. The die-cast high-strength heat-insulating lower box structure according to claim 1, characterized in that: The middle cross beam (17) includes an expansion support surface three (171) and a reinforcement rib three (172), wherein the reinforcement rib three (172) is fixedly connected to the inner wall of the expansion support surface three (171). The rear end cross beam (18) includes an expansion support surface four (181) and a reinforcement rib four (182), wherein one side of the reinforcement rib four (182) is fixedly connected to the outer wall of the expansion support surface four (181), and the other end of the reinforcement rib four (182) is fixedly connected to the outer wall of the rear end frame (14). The longitudinal beam (19) includes an expansion support surface five (191) and a reinforcement rib five (192), wherein the reinforcement rib five (192) is fixedly connected to the inner wall of the expansion support surface five (191). The top surface of the hanging seat (110) is provided with a mounting hole (1101), and the bottom surface of the hanging seat (110) is fixedly connected with a reinforcement rib six (1102).

6. The die-cast high-strength heat-insulating lower box structure according to claim 1, characterized in that: The water cooling plate assembly (2) comprises a temperature averaging plate (21), a flow channel plate (22) and a water inlet and outlet (23); the flow channel plate (22) is fixedly connected to the bottom surface of the temperature averaging plate (21); a mounting interface (211) is provided through the top surface of the temperature averaging plate (21); the flow channel plate (22) comprises a flow channel (221) and a first mounting surface (222); the first mounting surface (222) and the temperature averaging plate (21) are assembled and formed by brazing; and the water inlet and outlet (23) and the mounting interface (211) are formed by CMT welding.

7. The die-cast high-strength heat-insulating lower box structure according to claim 1, characterized in that: The thermal insulation pad (3) is formed by foaming, and glue is provided on both the upper and lower surfaces of the thermal insulation pad (3). The thermal insulation pad (3) is assembled with the water cooling plate assembly (2) and the bottom guard plate (4) by glue.

8. The die-cast high-strength heat-insulating lower box structure according to claim 7, characterized in that: The bottom guard plate (4) comprises a second mounting surface (41) and a bottom support surface (42), wherein the bottom support surface (42) is fixedly connected to the bottom surface of the second mounting surface (41), and the top surface of the second mounting surface (41) is assembled with the thermal insulation pad (3) by gluing.

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