Composite box bottom plate and processing technology thereof

Abstract

The composite box bottom plate comprises a box bottom plate body, a cooling groove is formed in the top of the box bottom plate body, a liquid cooling plate is riveted and fixed to the top of the box bottom plate body through bolts and nuts, a plurality of grooves are formed in the bottom of the box bottom plate body, and the box bottom plate body is made of an SMC composite material. The top of the box body bottom plate is provided with three colloids used for being bonded with a liquid cooling plate. The invention relates to the technical field of power battery box body processing. According to the composite material box body bottom plate, the processing technology thereof and the battery box body, SMC composite materials are adopted in the aspect of material selection, the corrosion resistance, the insulativity, the heat resistance and the light weight of a product are improved, the parts are integrated through the technology, the complexity of the manufacturing process is reduced, and compared with an existing metal part which usually needs 10-12 pairs of dies (stamping and forming), the manufacturing cost is reduced. SMC workpieces only need two pairs of dies (the upper die and the lower die), the investment cost is low, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery case processing, and in particular to a composite material case bottom plate and a processing technology thereof. Background Art

[0002] With the innovative design of battery packs and modules, safe cooling systems, electrical fire protection, corrosion resistance, and lightweight have also become key challenges in battery pack material selection. The battery pack case material should have the characteristics of electrical insulation, high heat dissipation and stability. The case is generally composed of an upper and lower case and a sealing system. The battery pack mass accounts for 18%-30% of the total vehicle system mass, and the case mass accounts for about 10%-20% of the total battery pack mass.

[0003] Currently, metals (aluminum alloy and steel) are commonly used as battery pack box materials. Aluminum alloy is lighter than steel, but its production process is relatively complex, the material cost is relatively high, the corrosion resistance is limited, the thermal conductivity is high, and the heat dissipation system is not strong enough, which may cause the internal temperature of the battery pack to be too high, thereby affecting the performance and life of the battery, and cannot meet the high demand for heat dissipation of power batteries. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a composite material case bottom plate and a processing technology thereof, which solve the problems of existing battery pack case materials being lightweight, having limited heat resistance and corrosion resistance, and having high costs.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a composite material box bottom plate, including a box bottom plate, a cooling groove is provided on the top of the box bottom plate, a liquid cooling plate is fixed to the top of the box bottom plate by riveting with bolts and nuts, a plurality of grooves are provided at the bottom of the box bottom plate, the box bottom plate is made of SMC composite material, three colloids for bonding with the liquid cooling plate are arranged on the top of the box bottom plate, and reinforcing beams are riveted and fixed on both sides of the top of the liquid cooling plate.

[0006] The present invention also discloses a processing technology for a composite material box bottom plate, comprising the following steps:

[0007] S1. The bottom plate structure of the box body is molded by a molding device using a composite material SMC;

[0008] S2, liquid cooling plate is made of brazed stamping plate, and the surface is sprayed with insulation;

[0009] S3. Assemble the liquid cooling plate with the SMC material box bottom plate, apply glue on the contact surface between the bottom plate and the cold plate to increase the shear force, and fix the front and rear ends with nuts and bolts to complete the assembly of the box bottom plate and the liquid cooling plate, and fix the overall frame into shape;

[0010] S4. Then assemble and rivet the liquid cooling plate and the frame with the bottom reinforcement beam, and finally assemble the bottom transport bearing wheel.

[0011] Preferably, the molding device includes a hydraulic cylinder, a base, a lower mold base and a stamping plate, the top of the stamping plate is fixedly connected to the cylinder, and the output end of the cylinder is fixedly connected to the mounting plate, both sides of the bottom of the mounting plate are fixedly connected to vertical rods, one end of the vertical rod that passes through the inside of the stamping plate is fixedly connected to a movable block, and an upper mold groove is opened at the bottom of the stamping plate.

[0012] Preferably, the inner wall of the lower mold base is provided with a placement plate, the bottom of the inner wall of the base is fixedly connected with an electric telescopic rod, and the output end of the electric telescopic rod is connected to the bottom of the placement plate through a driving assembly, the back of the base is fixedly connected with a limiting plate, and the top of the limiting plate is provided with a collection frame, the inner wall of the collection frame is fixedly connected with a sponge pad, and the back of the lower mold base is fixedly connected with a slide plate.

[0013] Preferably, the driving assembly includes a U-shaped frame fixedly connected to the output end of the electric telescopic rod, a first motor is fixedly connected to one side of the U-shaped frame, and a rotating shaft is fixedly connected to the output end of the first motor, a transmission gear is fixedly connected to the surface of the rotating shaft, a rotating shaft is rotatably connected between the two sides of the inner wall of the U-shaped frame, and a half gear meshing with the transmission gear is fixedly connected to the surface of the rotating shaft.

[0014] Preferably, a cooling cavity is provided inside the placement plate, and one side of the cooling cavity is connected to a cooling pipe.

[0015] Preferably, a cleaning assembly is provided on the top of the base through a screw mechanism, and the screw mechanism includes a second motor fixed to the front side of the base, the output end of the second motor is fixedly connected to a first screw rotatably connected to the inner wall of the base, and a second screw extending to the inside of the base is rotatably provided on the other side of the front side of the base, the surfaces of the first screw and the second screw are fixedly connected to pulleys, and the two pulleys are connected by belt transmission, the surfaces of the first screw and the second screw are threadedly connected to sleeves, and the top of the sleeve is fixedly connected to a vertical plate extending to the outside of the base.

[0016] Preferably, the cleaning assembly includes a cleaning sponge, one side of the vertical plate is fixedly connected to a support rod, and one end of the support rod is fixedly connected to a fixing plate, the interior of the fixing plate is fixedly connected to a double-rod hydraulic cylinder, and the upper and lower ends of the double-rod hydraulic cylinder are fixedly connected to a mounting plate, the surface of the mounting plate is bonded with a Velcro hook surface, and the surface of the cleaning sponge is provided with a Velcro velvet surface bonded to the Velcro hook surface.

[0017] Preferably, the four corners of the top of the base are fixedly connected to columns, the stamping plate is slidably set between the surfaces of the four columns, the top of the column is fixedly connected to a top plate, the hydraulic cylinder is fixed to the top of the top plate, and the output end of the hydraulic cylinder is fixedly connected to the top of the stamping plate.

[0018] The present invention provides a composite material box bottom plate and a processing technology thereof. It has the following beneficial effects:

[0019] (1) The composite material box bottom plate and its processing technology. The battery box adopts SMC composite material in material selection, which improves the corrosion resistance, insulation, heat resistance and lightness of the product. This process integrates its components and reduces the complexity of the manufacturing process. Compared with the existing metal parts that usually require 10-12 molds (stamping and forming), SMC parts only need two molds (upper mold and lower mold), which has low investment cost and improved production efficiency.

[0020] (2) The composite material box bottom plate and its processing technology. After the box bottom plate is molded, the vertical rod is first driven downward by the cylinder, and the vertical rod drives the movable block to move downward into the upper mold groove, thereby separating the box bottom plate from the stamping plate. When the stamping plate moves upward to demold, it can prevent the box bottom plate from adhering to the bottom of the stamping plate. After demolding, the box bottom plate can be automatically unloaded into the collection frame through the drive component, avoiding the need for manual material removal later, thereby improving work efficiency.

[0021] (3) The composite material box bottom plate and its processing technology, before molding, in order to ensure the molding quality of the molded material, the upper and lower cleaning sponges are driven by the screw mechanism to automatically clean the upper mold groove and the top of the placement plate to remove dust and impurities, thereby reducing the labor of workers and making it more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the disassembly of the bottom plate structure of the box body of the present invention;

[0023] Figure 2 A bottom view of the box bottom plate structure of the present invention;

[0024] Figure 3 It is a schematic diagram of the structure of the box bottom plate molding device of the present invention;

[0025] Figure 4 is a cross-sectional view of the stamping plate structure of the present invention;

[0026] Figure 5 It is a top view schematic diagram of the stamping plate structure of the present invention;

[0027] Figure 6 It is a cross-sectional view of the lower die base structure of the present invention;

[0028] Figure 7 It is a schematic diagram of the structure of the driving assembly of the present invention;

[0029] Figure 8 This is a schematic diagram of the blanking of the plate structure of the present invention;

[0030] Fig. 9 It is a partial schematic diagram of the screw mechanism structure of the present invention;

[0031] Fig.10 For the present invention Figure 1 A partial enlarged view of the middle A;

[0032] Fig.11 It is a schematic diagram of the disassembly of the cleaning sponge structure of the present invention.

[0033] In the figure: 1. Box bottom plate; 2. Cooling groove; 3. Liquid cooling plate; 4. Groove; 5. Colloid; 6. Reinforcement beam; 7. Hydraulic cylinder; 8. Base; 9. Lower die seat; 10. Punching plate; 11. Cylinder; 12. Mounting plate; 13. Vertical rod; 14. Movable block; 15. Upper die groove; 16. Placement plate; 17. Electric telescopic rod; 18. Limiting plate; 19. Collection frame; 20. Sponge pad; 21. Slide plate; 22. U-shaped frame; 23. First motor; 24. Rotating shaft; 25. Transmission gear; 26. Rotating shaft; 27. Half gear; 28. Cooling chamber; 29. ​​Cooling pipe; 30. Second motor; 31. First screw rod; 32. Second screw rod; 33. Pulley; 34. Belt; 35. Sleeve; 36. Vertical plate; 37. Cleaning sponge; 38. Support rod; 39. Fixed plate; 40. Double-rod hydraulic cylinder; 41. Horizontal plate; 42. Velcro hook surface; 43. Velcro velvet surface; 44. Column; 45. Top plate. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1

[0036] See also Figure 1 and Figure 2As shown, the present invention provides a composite material box bottom plate, including a box bottom plate 1. During processing, non-standard parts on the bottom plate are embedded in the mold. A cooling groove 2 is provided on the top of the box bottom plate 1. A liquid cooling plate 3 is fixed to the top of the box bottom plate 1 by bolts and nuts riveting. A protrusion matching the cooling groove 2 is provided at the bottom of the liquid cooling plate 3 for easy assembly. A plurality of grooves 4 are provided at the bottom of the box bottom plate 1. The box bottom plate 1 is made of SMC composite material. The SMC composite material is a thermosetting thermal composite material, a sheet molding compound SMC composite material made of resin paste impregnated glass fiber, and the main raw materials are GF (special yarn), UP (unsaturated resin), low shrinkage additives, MD (filler) and various additives. Three colloids 5 for bonding with the liquid cooling plate 3 are provided on the top of the box bottom plate 1, and reinforcing beams 6 are riveted and fixed on both sides of the top of the liquid cooling plate 3.

[0037] Through the setting of the above structure, SMC replaces the alloy material box, improves its insufficient lightness and low corrosion resistance, and improves the service life of the product; the box bottom plate 1 structural design, the lower box bottom plate 1 made of SMC composite material is molded, and there are multiple neatly arranged grooves 4 at the bottom of the bottom plate, which can achieve lightweight design, disperse stress, strengthen structure, and enhance the advantages of natural convection heat exchange; at the same time, the product frame structure is fixed by bolts and nuts riveting, and the liquid cooling plate 3 and the lower box are connected by colloid 5 bonding, which is a breakthrough in the traditional process, reduces the equipment dependence generated during product production, reduces assembly costs, and greatly improves production efficiency.

[0038] Embodiment 2

[0039] The present invention also discloses a processing technology for a composite material box bottom plate, comprising the following steps:

[0040] S1, the structure of the box bottom plate 1 is made of composite material SMC and is molded by a molding device;

[0041] S2, liquid cooling plate 3 is made of brazed stamping plate, and the surface is sprayed with insulation;

[0042] S3, assemble the liquid cooling plate 3 with the box bottom plate 1 made of SMC material, apply the glue 5 on the contact surface between the bottom plate and the cold plate to increase the shear force, and fix the front and rear ends with nuts and bolts at the same time, complete the assembly of the box bottom plate 1 and the liquid cooling plate 3, and fix the overall frame into shape;

[0043] S4. Then assemble and rivet the liquid cooling plate 3 and the frame with the bottom reinforcement beam 6 to increase the bottom rigidity and support force, and finally assemble the bottom transport bearing wheel to ensure the overall installation and assembly of subsequent products.

[0044] After the box bottom plate 1 is assembled, the overall 314AH battery cell module is assembled internally, and the module blocks are connected in groups using connecting pieces; the front panel and maintenance panel are installed in conjunction with the sealing gasket, and the nuts and products are riveted and assembled; the PCM material upper cover is pushed in and fixed with bolts after reaching the limit position.

[0045] Embodiment 3

[0046] Based on Example 1, please refer to Figures 3 to 8 As shown, the specific improvements are as follows: the molding device includes a hydraulic cylinder 7, a base 8, a lower die seat 9 and a stamping plate 10, the top of the stamping plate 10 is fixedly connected with a cylinder 11, and the output end of the cylinder 11 is fixedly connected with a mounting plate 12, both sides of the bottom of the mounting plate 12 are fixedly connected with vertical rods 13, one end of the vertical rod 13 that penetrates into the inside of the stamping plate 10 is fixedly connected with a movable block 14, and the movable block 14 is located at the top of the upper die groove 15, the bottom of the stamping plate 10 is provided with an upper die groove 15, and the inside of the placement plate 16 is provided with a cooling cavity 28, and one side of the cooling cavity 28 is connected with a cooling pipe 29, and the cooling pipe 29 is a retractable hose connected to an external water supply mechanism;

[0047] The inner wall of the lower die base 9 is provided with a placement plate 16, the bottom of the inner wall of the base 8 is fixedly connected with an electric telescopic rod 17, and the output end of the electric telescopic rod 17 is connected to the bottom of the placement plate 16 through a driving component, the back of the base 8 is fixedly connected with a limit plate 18 for limiting the placement of the collection frame 19, and the top of the limit plate 18 is provided with the collection frame 19, the inner wall of the collection frame 19 is fixedly connected with a sponge pad 20, and the back of the lower die base 9 is fixedly connected with a slide plate 21;

[0048] The driving assembly includes a U-shaped frame 22 fixedly connected to the output end of the electric telescopic rod 17, a first motor 23 is fixedly connected to one side of the U-shaped frame 22, the rotation stroke of the first motor 23 is preset by an external control system, and a rotating shaft 24 is fixedly connected to the output end of the first motor 23, a transmission gear 25 is fixedly connected to the surface of the rotating shaft 24, a rotating shaft 26 is rotatably connected between the two sides of the inner wall of the U-shaped frame 22, and a half gear 27 meshing with the transmission gear 25 is fixedly connected to the surface of the rotating shaft 26;

[0049] The four corners of the top of the base 8 are fixedly connected with columns 44, the stamping plate 10 is slidably set between the surfaces of the four columns 44, the top of the column 44 is fixedly connected with a top plate 45, the hydraulic cylinder 7 is fixed on the top of the top plate 45, and the output end of the hydraulic cylinder 7 is fixedly connected to the top of the stamping plate 10.

[0050] By setting the above structure, the cut box bottom plate 1 is placed in the lower die seat 9, the hydraulic cylinder 7 drives the stamping plate 10 downward to mold the box bottom plate 1, and then the cylinder 11 is started to drive the mounting plate 12 to move downward, and the mounting plate 12 drives the movable block 14 to move downward into the upper die groove 15 through the vertical rod 13, and the movable block 14 separates the box bottom plate 1 from the stamping plate 10. When the stamping plate 10 moves upward to demould, it can prevent the box bottom plate 1 from adhering to the stamping plate 10. By starting the electric The telescopic rod 17 drives the placement plate 16 to move upward out of the lower die base 9 through the driving assembly, and then starts the first motor 23, drives the transmission gear 25 to rotate through the rotating shaft 24, and the transmission gear 25 drives the half gear 27 to rotate, and the half gear 27 drives the placement plate 16 to tilt backward, so that the box bottom plate 1 on the placement plate 16 slides backward, and the material is automatically unloaded into the collection frame 19, without manual collection, and the sponge pad 20 in the collection frame 19 plays a buffering and protective role for the box bottom plate 1;

[0051] During the molding process, the external water supply mechanism can deliver cooling water to the inside of the placement plate 16 through the cooling pipe 29, so that the cooling is more sufficient, which is convenient for accelerating the cooling speed of the workpiece during molding and improving the molding efficiency.

[0052] Embodiment 4

[0053] In conjunction with Example 1 and Example 2, please refer to Figure 3 and Figures 9 to 11 As shown, the specific improvements are as follows: a cleaning assembly is arranged on the top of the base 8 through a screw mechanism, the screw mechanism includes a second motor 30 fixed on the front of the base 8, the output end of the second motor 30 is fixedly connected to a first screw 31 rotatably connected to the inner wall of the base 8, and a second screw 32 extending to the inside of the base 8 is rotatably arranged on the other side of the front of the base 8, the surfaces of the first screw 31 and the second screw 32 are fixedly connected to pulleys 33, and the two pulleys 33 are connected by a belt 34 for transmission, the surfaces of the first screw 31 and the second screw 32 are threadedly connected to sleeves 35, and the top of the sleeve 35 is fixedly connected to a vertical plate 36 extending to the outside of the base 8;

[0054] The cleaning assembly includes a cleaning sponge 37, a support rod 38 is fixedly connected to one side of the vertical plate 36, and one end of the support rod 38 is fixedly connected to a fixed plate 39, a double-rod hydraulic cylinder 40 is fixedly connected inside the fixed plate 39, and the upper and lower ends of the double-rod hydraulic cylinder 40 are fixedly connected to a horizontal plate 41, a Velcro hook surface 42 is bonded to the surface of the horizontal plate 41, and a Velcro velvet surface 43 bonded to the Velcro hook surface 42 is provided on the surface of the cleaning sponge 37.

[0055] Through the arrangement of the above structure, before molding, the second motor 30 is started to drive the first screw 31 to rotate, and the second screw 32 rotates in the same direction driven by the belt 34 and the pulley 33. Under the guidance of the slider, the vertical plate 36 drives the cleaning component to reciprocate on the two screws through the sleeve 35, and the upper mold groove 15 and the top of the placement plate 16 are automatically cleaned to remove dust and impurities to ensure the molding quality of the molded material. The cleaning sponge 37 is easy to tear off and replace through the arrangement of the Velcro velvet surface 43 and the Velcro hook surface 42.

[0056] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited, and conventional equipment compatible with the equipment can be used.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A composite material box bottom plate, comprising a box bottom plate (1), characterized in that: The top of the box bottom plate (1) is provided with a cooling groove (2), the top of the box bottom plate (1) is fixed with a liquid cooling plate (3) by riveting with bolts and nuts, the bottom of the box bottom plate (1) is provided with a plurality of grooves (4), the box bottom plate (1) is made of SMC composite material, the top of the box bottom plate (1) is provided with three colloids (5) for bonding with the liquid cooling plate (3), and reinforcing beams (6) are riveted and fixed on both sides of the top of the liquid cooling plate (3).

2. The processing technology of a composite material box bottom plate according to claim 1 is characterized in that: The following steps are involved: S1, the box bottom plate (1) structure is made of composite material SMC and is molded by a molding device; S2, liquid cooling plate (3) is made of brazed stamping plate, and the surface is sprayed with insulation; S3, assembling the liquid cooling plate (3) and the box bottom plate (1) made of SMC material, applying a glue (5) on the contact surface between the bottom plate and the cold plate to increase the shear force, and riveting and fixing the front and rear ends with nuts and bolts to complete the assembly of the box bottom plate (1) and the liquid cooling plate (3), and the overall frame is fixed and formed; S4, then assemble and rivet the liquid cooling plate (3) and the frame with the bottom reinforcement beam (6), and finally assemble the bottom transport bearing wheel.

3. The processing technology of a composite material box bottom plate according to claim 2 is characterized in that: The molding device comprises a hydraulic cylinder (7), a base (8), a lower die seat (9) and a stamping plate (10); the top of the stamping plate (10) is fixedly connected to a cylinder (11), and the output end of the cylinder (11) is fixedly connected to a mounting plate (12); both sides of the bottom of the mounting plate (12) are fixedly connected to vertical rods (13); one end of the vertical rod (13) that passes through the inside of the stamping plate (10) is fixedly connected to a movable block (14); and an upper die groove (15) is provided at the bottom of the stamping plate (10).

4. The processing technology of a composite material box bottom plate according to claim 3 is characterized in that: The inner wall of the lower die base (9) is provided with a placement plate (16); the bottom of the inner wall of the base (8) is fixedly connected to an electric telescopic rod (17), and the output end of the electric telescopic rod (17) is connected to the bottom of the placement plate (16) through a driving component; the back of the base (8) is fixedly connected to a limit plate (18), and the top of the limit plate (18) is provided with a collection frame (19); the inner wall of the collection frame (19) is fixedly connected to a sponge pad (20); and the back of the lower die base (9) is fixedly connected to a slide plate (21).

5. The processing technology of a composite material box bottom plate according to claim 4 is characterized in that: The driving assembly comprises a U-shaped frame (22) fixedly connected to the output end of the electric telescopic rod (17); a first motor (23) is fixedly connected to one side of the U-shaped frame (22); a rotating shaft (24) is fixedly connected to the output end of the first motor (23); a transmission gear (25) is fixedly connected to the surface of the rotating shaft (24); a rotating shaft (26) is rotatably connected between two sides of the inner wall of the U-shaped frame (22); and a half gear (27) meshing with the transmission gear (25) is fixedly connected to the surface of the rotating shaft (26).

6. The processing technology of a composite material box bottom plate according to claim 4 is characterized in that: A cooling cavity (28) is provided inside the placement plate (16), and one side of the cooling cavity (28) is connected to a cooling pipe (29).

7. The processing technology of a composite material box bottom plate according to claim 3 is characterized in that: A cleaning assembly is arranged on the top of the base (8) via a screw mechanism, the screw mechanism comprising a second motor (30) fixed on the front face of the base (8), the output end of the second motor (30) being fixedly connected to a first screw (31) rotatably connected to the inner wall of the base (8), a second screw (32) extending to the inside of the base (8) being rotatably arranged on the other side of the front face of the base (8), the surfaces of the first screw (31) and the second screw (32) being fixedly connected to pulleys (33), the two pulleys (33) being connected by a belt (34), the surfaces of the first screw (31) and the second screw (32) being threadedly connected to sleeves (35), and the top of the sleeve (35) being fixedly connected to a vertical plate (36) extending to the outside of the base (8).

8. The processing technology of a composite material box bottom plate according to claim 7 is characterized in that: The cleaning assembly comprises a cleaning sponge (37), one side of the vertical plate (36) is fixedly connected to a support rod (38), one end of the support rod (38) is fixedly connected to a fixing plate (39), the interior of the fixing plate (39) is fixedly connected to a double-rod hydraulic cylinder (40), and the upper and lower ends of the double-rod hydraulic cylinder (40) are fixedly connected to a transverse plate (41), a Velcro hook surface (42) is bonded to the surface of the transverse plate (41), and a Velcro velvet surface (43) bonded to the Velcro hook surface (42) is provided on the surface of the cleaning sponge (37).

9. The processing technology of a composite material box bottom plate according to claim 3 is characterized in that: The four corners of the top of the base (8) are fixedly connected to columns (44), the stamping plate (10) is slidably arranged between the surfaces of the four columns (44), the top of the columns (44) is fixedly connected to a top plate (45), the hydraulic cylinder (7) is fixed to the top of the top plate (45), and the output end of the hydraulic cylinder (7) is fixedly connected to the top of the stamping plate (10).

Images