Center bearing type efficient liquid cooling heat dissipation battery box body

Abstract

The invention discloses a center bearing type efficient liquid cooling heat dissipation battery box which comprises a center liquid cooling plate, an upper sealing box cover, a lower sealing box cover, an upper battery cell group and a lower battery cell group, the upper sealing box cover and the lower sealing box cover are arranged on the upper side and the lower side of the center liquid cooling plate, an upper battery cell cavity is formed between the upper sealing box cover and the center liquid cooling plate, and a lower battery cell cavity is formed between the lower sealing box cover and the center liquid cooling plate. A lower battery cell cavity is formed between the lower sealing box cover and the central liquid cooling plate, the upper battery cell group is mounted in the upper battery cell cavity, and the lower battery cell group is mounted in the lower battery cell cavity; the upper battery cell group and the lower battery cell group are respectively arranged on the upper side and the lower side of the central liquid cooling plate, so that the upper side and the lower side of the central liquid cooling plate can simultaneously dissipate heat and bear the upper battery cell group and the lower battery cell group, thereby greatly improving the utilization rate of the heat dissipation system and the stability of the installed battery cells; the battery cells on the upper side and the lower side of the central liquid cooling plate can be uniformly cooled, faults of the battery cells due to nonuniform heat dissipation are prevented, and the battery box can be combined according to the shape of the battery box mounting bin, so that the battery box mounting bin has a relatively large application range.

Description

Technical Field

[0001] The present invention belongs to the field of power battery manufacturing, and more specifically relates to a centrally-loaded, high-efficiency liquid-cooled heat dissipation battery box. Background Art

[0002] High energy density and high power power batteries will generate a lot of heat when running. If the heat dissipation effect is not up to standard, the power battery life will be shortened or even explode. The existing battery packs do not have a heat dissipation system or only place the battery cells at one end of the heat dissipation system. The utilization rate of the heat dissipation system is low, and the heat dissipation of the battery cells is uneven, which can easily cause the battery cells to malfunction due to uneven heat dissipation. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a centrally loaded high-efficiency liquid-cooled heat dissipation battery box, in which the battery cells are respectively arranged on the upper and lower sides of the central liquid cooling plate, thereby greatly improving the utilization rate of the heat dissipation system and the stability of the battery cells after installation, and being able to evenly dissipate the heat of the battery cells on the upper and lower sides of the central liquid cooling plate, thereby preventing the battery cells from malfunctioning due to uneven heat dissipation.

[0004] Technical solution: To achieve the above-mentioned purpose, the present invention provides a centrally-loaded, high-efficiency liquid-cooled heat dissipation battery box, comprising a central liquid cooling plate, an upper sealed box cover, a lower sealed box cover, an upper battery cell group and a lower battery cell group. The upper sealed box cover and the lower sealed box cover are located on the upper and lower sides of the central liquid cooling plate. An upper battery cell cavity is formed between the upper sealed box cover and the central liquid cooling plate, and a lower battery cell cavity is formed between the lower sealed box cover and the central liquid cooling plate. The upper battery cell group is installed in the upper battery cell cavity, and the lower battery cell group is installed in the lower battery cell cavity.

[0005] Furthermore, the upper battery cell group includes a first battery cell, a second battery cell and an upper distribution box, and the upper side of the central liquid cooling plate is equidistantly connected with a first module side panel, a second module side panel and a third module side panel, the first module side panel is clamped between the first battery cell and the upper sealed box cover, the second module side panel is clamped between the first battery cell and the second battery cell, and the third module side panel is clamped between the second battery cell and the upper sealed box cover.

[0006] Furthermore, the lower battery cell group includes a third battery cell, a fourth battery cell and a lower distribution box, and the lower side of the central liquid cooling plate is equidistantly connected with a fourth module side panel, a fifth module side panel and a sixth module side panel, the fourth module side panel is clamped between the third battery cell and the lower sealed box cover, the fifth module side panel is clamped between the third battery cell and the fourth battery cell, and the sixth module side panel is clamped between the fourth battery cell and the lower sealed box cover.

[0007] Furthermore, three groups of upper mounting holes are equidistantly provided on the upper side of the central liquid cooling plate, each of which includes a number of mounting holes, and the first module side panel, the second module side panel and the third module side panel are installed to the upper side of the central liquid cooling plate through the three groups of upper mounting holes; three groups of lower mounting holes are equidistantly provided on the lower side of the central liquid cooling plate, each of which includes a number of mounting holes, and the fourth module side panel, the fifth module side panel and the sixth module side panel are installed to the lower side of the central liquid cooling plate through the three groups of lower mounting holes.

[0008] Furthermore, a plurality of process grooves are equidistantly formed on the side of the first module side panel, the second module side panel and the third module side panel away from the central liquid cooling plate, and a connecting hole is formed through the bottom of each process groove, and each connecting hole is coaxially arranged with each mounting hole and locked by a locking member; a plurality of process grooves are equidistantly formed on the side of the fourth module side panel, the fifth module side panel and the sixth module side panel close to the lower sealing box body, and a connecting hole is formed through the bottom of each process groove, and each connecting hole is coaxially arranged with each mounting hole and locked by a locking member.

[0009] Furthermore, an upper sealing frame and a lower sealing frame are respectively installed on the upper and lower sides of the central liquid cooling plate, and the upper sealing frame and the lower sealing frame are respectively connected to the upper distribution box mounting plate and the lower distribution box mounting plate.

[0010] Furthermore, a plurality of upper heat spreader plate connection holes are provided on the side of the first module side plate and the third module side plate close to the upper sealed box cover, and the side of the first battery cell and the second battery cell close to the upper sealed box cover are connected to the upper heat spreader plate through the plurality of upper heat spreader plate connection holes; a plurality of lower heat spreader plate connection holes are provided on the side of the fourth module side plate and the sixth module side plate close to the lower sealed box cover, and the side of the third battery cell and the fourth battery cell close to the lower sealed box cover are connected to the lower heat spreader plate through the plurality of lower heat spreader plate connection holes.

[0011] Further, there are at least six process slots on the second module side plate, and the six process slots are respectively a first process slot, a second process slot, a third process slot, a fourth process slot, a fifth process slot and a sixth process slot, and the first process slot, the second process slot, the third process slot, the fourth process slot, the fifth process slot and the sixth process slot divide the side of the second module side plate away from the central liquid cooling plate into seven sections of side plates, which are respectively a first section of side plate, a second section of side plate, a third section of side plate, a fourth section of side plate, a fifth section of side plate, a sixth section of side plate and a seventh section of side plate;

[0012] The first section side plate, the third section side plate, the fifth section side plate and the seventh section side plate are respectively provided with a first air guide groove, a third air guide groove, a fifth air guide groove and a seventh air guide groove on a side close to the first battery cell; the second section side plate, the fourth section side plate and the sixth section side plate are respectively provided with a second air guide groove, a fourth air guide groove and a sixth air guide groove on a side close to the second battery cell;

[0013] The side of the first section side panel close to the upper distribution box is connected to the upper air inlet duct, and the side of the seventh section side panel close to the upper sealing box cover is connected to the upper air outlet duct; the end of the first air guide groove away from the first process groove is connected to the air outlet end of the upper air inlet duct, and the end of the seventh air guide groove away from the sixth process groove is connected to the air inlet end of the upper air outlet duct.

[0014] Beneficial effect: The present invention provides a centrally loaded high-efficiency liquid-cooled heat dissipation battery box, in which the upper battery cell group and the lower battery cell group are respectively arranged on the upper and lower sides of the central liquid cooling plate, so that the upper and lower sides of the central liquid cooling plate can dissipate heat for the upper battery cell group and the lower battery cell group at the same time, thereby greatly improving the utilization rate of the heat dissipation system and the stability of the battery cells after installation, and can evenly dissipate heat for the battery cells on the upper and lower sides of the central liquid cooling plate, preventing the battery cells from malfunctioning due to uneven heat dissipation, and can be combined according to the shape of the battery box installation compartment, having a large scope of application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a centrally loaded high-efficiency liquid-cooled heat dissipation battery box of the present invention;

[0016] Figure 2 It is a schematic diagram of the installation structure of the upper battery cell group in the first embodiment of the present invention;

[0017] Figure 3 It is a schematic diagram of the installation structure of the lower battery cell group in the first embodiment of the present invention;

[0018] Figure 4 A top view of the central liquid cooling plate of the present invention installed with an upper sealing frame;

[0019] Figure 5 It is a schematic diagram of the lower sealing frame structure of the present invention;

[0020] Figure 6 It is a schematic diagram of the installation structure of the module side plate and the central liquid cooling plate of the present invention;

[0021] Figure 7 It is a schematic structural diagram of the first, second and third module side panels in the second embodiment of the present invention;

[0022] Figure 8 It is a schematic structural diagram of the fourth, fifth and sixth module side panels in the second embodiment of the present invention;

[0023] Fig. 9 It is a schematic diagram of the installation structure of the upper battery cell group in the second embodiment of the present invention;

[0024] Fig.10 It is a schematic diagram of the installation structure of the lower battery cell group in the second embodiment of the present invention;

[0025] Fig.11 It is a schematic diagram of a side-by-side assembly of a centrally loaded high-efficiency liquid-cooled heat dissipation battery box of the present invention;

[0026] Fig.12 It is a schematic diagram of stacking and assembling a centrally-loaded, high-efficiency, liquid-cooled and heat-dissipating battery box according to the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] As attached Figure 1 As shown, in the first embodiment of the present invention, a central load-bearing high-efficiency liquid-cooled heat dissipation battery box includes a central liquid cooling plate 1, an upper sealed box cover 2a, a lower sealed box cover 2b, an upper battery cell group 3a and a lower battery cell group 3b, and the upper sealed box cover 2a and the lower sealed box cover 2b are located on the upper and lower sides of the central liquid cooling plate 1, as shown in FIG. Figure 2 As shown, the side of the upper sealed box cover 2a close to the central liquid cooling plate 1 is bent outward and extended to form an upper box cover side skirt 28a. A plurality of assembly holes 29 are evenly spaced on the upper box cover side skirt 28a. Figure 3 As shown, the side of the lower sealed box cover 2b close to the central liquid cooling plate 1 is bent outward to form a lower box cover side skirt 28b, and a plurality of assembly holes 29 are evenly spaced on the lower box cover side skirt 28b. Figure 1 As shown, an upper sealing frame 20a and a lower sealing frame 20b are respectively installed on the upper and lower sides of the central liquid cooling plate 1. Figure 4 and 5 As described above, the upper sealing frame 20a and the lower sealing frame 20b are provided with matching holes 30 at equal distances, and each assembly hole 29 is coaxially arranged with each matching hole 30. Through the matching relationship between the fastener and the assembly hole 29 and the matching hole 30, the upper sealing frame 20a and the lower sealing frame 20b are respectively connected to the upper distribution box mounting plate 21a and the lower distribution box mounting plate 21b; Figure 2 and 3 As shown, an upper cell cavity 10a is formed between the upper sealed box cover 2a and the central liquid cooling plate 1, and a lower cell cavity 10b is formed between the lower sealed box cover 2b and the central liquid cooling plate 1. The upper cell group 3a is installed in the upper cell cavity 10a, and the lower cell group 3b is installed in the lower cell cavity 10b. The upper and lower sides of the central liquid cooling plate 1 respectively dissipate heat for the upper cell group 3a and the lower cell group 3b and carry the upper cell group 3a and the lower cell group 3b, as shown in FIG. Figure 1 As shown, an upper heat spreader 27a is provided between the upper battery cell group 3a and the upper sealed box cover 2a, and a lower heat spreader 27b is provided between the lower battery cell group 3b and the lower sealed box cover 2b.

[0029] like Figure 2As shown, the upper battery group 3a includes a first battery core 13a, a second battery core 13b and an upper distribution box 15a, and the upper side of the central liquid cooling plate 1 is equidistantly connected with a first module side plate 8a, a second module side plate 8b and a third module side plate 8c, the first module side plate 8a is sandwiched between the first battery core 13a and the upper sealed box cover 2a, the second module side plate 8b is sandwiched between the first battery core 13a and the second battery core 13b, and the third module side plate 8c is sandwiched between the second battery core 13b and the upper sealed box cover 2a. The upper distribution box 15a is sandwiched between the first module side plate 8a, the second module side plate 8b and the third module side plate 8c on the side close to the upper distribution box 15a and the upper sealed box cover 2a on the side close to the upper distribution box 15a. Two upper power transmission connectors 16a are arranged on the side of the upper distribution box 15a away from the first battery cell 13a and the second battery cell 13b. Two upper connector holes 17a are provided on the side of the upper sealed box cover 2a close to the upper distribution box 15a. The power transmission connector 16a passes through the two upper connector holes 17a on the outer side of the upper sealed box cover 2a; the first battery cell installation cavity 11a is formed between the first module side plate 8a and the second module side plate 8b on the side close to the first battery cell 13a and the side of the upper sealed box cover 2a away from the upper distribution box 15a, and the cavity wall of the first battery cell installation cavity 11a has a supporting force for the first battery cell 13a; the second module side plate 8b and the third module side plate 8c on the side close to the second battery cell 13b and the upper sealed box cover A second battery cell installation cavity 11b is formed between the side of the first module side panel 8a, the second module side panel 8b and the third module side panel 8c close to the upper distribution box 15a and the side of the upper sealed box cover 2a close to the upper distribution box 15a, and the cavity wall of the upper distribution box installation cavity 12a has a supporting force on the upper distribution box 15a.

[0030] like Figure 3As shown, the lower battery group 3b includes a third battery cell 13c, a fourth battery cell 13d and a lower distribution box 15b, and the lower side of the central liquid cooling plate 1 is equidistantly connected with a fourth module side plate 8d, a fifth module side plate 8e and a sixth module side plate 8f, the fourth module side plate 8d is sandwiched between the third battery cell 13c and the lower sealed box cover 2b, the fifth module side plate 8e is sandwiched between the third battery cell 13c and the fourth battery cell 13d, and the sixth module side plate 8f is sandwiched between the fourth battery cell 13d and the lower sealed box cover 2b. The lower distribution box 15b is sandwiched between the side of the fourth module side plate 8d, the fifth module side plate 8e and the sixth module side plate 8f close to the lower distribution box 15b and the side of the lower sealed box cover 2b close to the lower distribution box 15b. Two lower power transmission connectors 16b are arranged on the side of the lower distribution box 15b away from the third battery cell 13c and the fourth battery cell 13d. Two lower connector holes 17b are provided on the side of the lower sealed box cover 2b close to the lower distribution box 15b. The lower power transmission connector 16b passes through the two lower connector holes 17b on the outer side of the lower sealed box cover 2b; the side of the fourth module side plate 8d and the fifth module side plate 8e close to the third battery cell 13c and the side of the lower sealed box cover 2b away from the lower distribution box 15b form a third battery cell installation cavity 11c, and the cavity of the third battery cell installation cavity 11c has a supporting force for the third battery cell 13c; the side of the fifth module side plate 8e and the sixth module side plate 8f close to the fourth battery cell 13d and the lower sealed box cover 2b are connected to the lower sealed box cover 2b. A fourth battery cell installation cavity 11d is formed between the side of the cover 2b away from the lower distribution box 15b, and the cavity of the fourth battery cell installation cavity 11d has a supporting force for the fourth battery cell 13d; a lower distribution box installation cavity 12b is formed between the side of the fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f close to the lower distribution box 15b and the side of the lower sealed box cover 2b close to the lower distribution box 15b, and the cavity wall of the lower distribution box installation cavity 12b has a supporting force for the lower distribution box 15b.

[0031] like Figure 4 and 6 As shown, three groups of upper mounting hole groups 5a are equidistantly provided on the upper side of the central liquid cooling plate 1, and each of the upper mounting hole groups 5a includes a number of mounting holes 51. The first module side panel 8a, the second module side panel 8b and the third module side panel 8c are installed to the upper side of the central liquid cooling plate 1 through the three groups of upper mounting hole groups 5a, and the first module side panel 8a, the second module side panel 8b and the third module side panel 8c are all located within the encirclement of the upper sealing frame 20a; three groups of lower mounting hole groups 5b are equidistantly provided on the lower side of the central liquid cooling plate 1, and each of the lower mounting hole groups 5b includes a number of mounting holes 51. The fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f are installed to the lower side of the central liquid cooling plate 1 through the three groups of lower mounting hole groups 5b, and the fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f are all located within the encirclement of the lower sealing frame 20b.

[0032] like Figure 6As shown, since an upper heat spreader 27a is provided between the upper cell group 3a and the upper sealed box cover 2a, in order to ensure that the upper heat spreader 27a can effectively heat the upper cell group 3a, it is necessary to closely contact the lower side of the upper heat spreader 27a with the upper sides of the first cell 13a and the second cell 13b. Therefore, a plurality of process grooves 81 are evenly spaced on the side of the first module side plate 8a, the second module side plate 8b and the third module side plate 8c away from the central liquid cooling plate 1. A connecting hole 82 is provided through the bottom of each process groove 81. Each connecting hole 82 is coaxially arranged with each mounting hole 51 and is locked by a locking member.

[0033] Since a lower heat spreader 27b is provided between the lower cell group 3b and the lower sealed box cover 2b, in order to ensure that the lower heat spreader 27b can effectively heat the lower cell group 3b, the upper side of the lower heat spreader 27b needs to be in close contact with the lower sides of the third cell 13c and the fourth cell 13d. Therefore, a plurality of process grooves 81 are evenly spaced on the side of the fourth module side plate 8d, the fifth module side plate 8e and the sixth module side plate 8f close to the lower sealed box body 2b. A connecting hole 82 is provided through the bottom of each process groove 81. Each connecting hole 82 is coaxially arranged with each mounting hole 51 and is locked by a locking member.

[0034] A plurality of upper heat spreader connection holes 84a are provided on the side of the first module side plate 8a and the third module side plate 8c close to the upper sealed box cover 2a, and the first battery cell 13a and the second battery cell 13b are connected to the upper heat spreader 27a through the plurality of upper heat spreader connection holes 84a on the side of the first module side plate 8a and the third module side plate 8c, so that the lower side of the upper heat spreader 27a is in close contact with the upper side of the first battery cell 13a and the second battery cell 13b;

[0035] A plurality of lower heat spreader connection holes 84b are provided on the side of the fourth module side panel 8d and the sixth module side panel 8f close to the lower sealed box cover 2b, and the side of the third battery cell 13c and the fourth battery cell 13d close to the lower sealed box cover 2b are connected to the lower heat spreader 27b through the plurality of lower heat spreader connection holes 84b, and one end of a plurality of fasteners passes through the lower surface of the lower heat spreader 27b and cooperates with the respective lower heat spreader connection holes 84b on the fourth module side panel 8d and the sixth module side panel 8f, so that the upper side of the lower heat spreader 27b is in close contact with the lower side of the third battery cell 13c and the fourth battery cell 13d.

[0036] In the first embodiment of the present invention described above, although the upper battery cell group 3a and the lower battery cell group 3b can be effectively cooled at the same time, since the second module side plate 8b is sandwiched between the first battery cell 13a and the second battery cell 13b, the second module side plate 8b needs to exchange heat with the first battery cell 13a and the second battery cell 13b at the same time, resulting in the temperature of the second module side plate 8b being higher than the temperature of the first module side plate 8a and the second module side plate 8c, thereby causing the temperature of the first battery cell 13a and the second battery cell 13b close to the second module side plate 8b to be higher than the temperature of the first battery cell 13a and the second battery cell 13b away from the second module side plate 8b, resulting in uneven temperatures of the first battery cell 13a and the second battery cell 13b, which can easily lead to the first battery cell 13a and The second battery cell 13b fails; similarly, since the fifth module side plate 8e is sandwiched between the third battery cell 13c and the fourth battery cell 13d, the fifth module side plate 8e needs to perform heat exchange on the third battery cell 13c and the fourth battery cell 13d at the same time, resulting in the temperature of the fifth module side plate 8e being higher than the temperatures of the fourth module side plate 8d and the sixth module side plate 8f, thereby causing the temperature of the third battery cell 13c and the fourth battery cell 13d close to the fifth module side plate 8e to be higher than the temperature of the third battery cell 13c and the fourth battery cell 13d away from the fifth module side plate 8e, resulting in uneven temperatures of the third battery cell 13c and the fourth battery cell 13d, which can easily cause the third battery cell 13c and the fourth battery cell 13d to fail; based on the above problems, the present invention proposes a second embodiment.

[0037] As attached Figure 1 As shown, in the second embodiment of the present invention, a central load-bearing high-efficiency liquid-cooled heat dissipation battery box includes a central liquid cooling plate 1, an upper sealed box cover 2a, a lower sealed box cover 2b, an upper battery cell group 3a and a lower battery cell group 3b, and the upper sealed box cover 2a and the lower sealed box cover 2b are on the upper and lower sides of the central liquid cooling plate 1, as shown in FIG. Figure 2 As shown, the side of the upper sealed box cover 2a close to the central liquid cooling plate 1 is bent outward and extended to form an upper box cover side skirt 28a. A plurality of assembly holes 29 are evenly spaced on the upper box cover side skirt 28a. Figure 3 As shown, the side of the lower sealed box cover 2b close to the central liquid cooling plate 1 is bent outward to form a lower box cover side skirt 28b, and a plurality of assembly holes 29 are evenly spaced on the lower box cover side skirt 28b. Figure 1 As shown, an upper sealing frame 20a and a lower sealing frame 20b are respectively installed on the upper and lower sides of the central liquid cooling plate 1. Figure 4 and 5 As described above, the upper sealing frame 20a and the lower sealing frame 20b are provided with matching holes 30 at equal distances, and each assembly hole 29 is coaxially arranged with each matching hole 30. Through the matching relationship between the fastener and the assembly hole 29 and the matching hole 30, the upper sealing frame 20a and the lower sealing frame 20b are respectively connected to the upper distribution box mounting plate 21a and the lower distribution box mounting plate 21b; Figure 2 and 3 As shown, an upper cell cavity 10a is formed between the upper sealed box cover 2a and the central liquid cooling plate 1, and a lower cell cavity 10b is formed between the lower sealed box cover 2b and the central liquid cooling plate 1. The upper cell group 3a is installed in the upper cell cavity 10a, and the lower cell group 3b is installed in the lower cell cavity 10b. The upper and lower sides of the central liquid cooling plate 1 respectively dissipate heat for the upper cell group 3a and the lower cell group 3b and carry the upper cell group 3a and the lower cell group 3b, as shown in FIG. Figure 1 As shown, an upper heat spreader 27a is provided between the upper battery cell group 3a and the upper sealed box cover 2a, and a lower heat spreader 27b is provided between the lower battery cell group 3b and the lower sealed box cover 2b.

[0038] like Fig. 9 As shown, the upper battery group 3a includes a first battery cell 13a, a second battery cell 13b and an upper distribution box 15a. The upper side of the central liquid cooling plate 1 is equidistantly connected with a first module side plate 8a, a second module side plate 8b and a third module side plate 8c. The first module side plate 8a is sandwiched between the first battery cell 13a and the upper sealed box cover 2a. The second module side plate 8b is sandwiched between the first battery cell 13a and the second battery cell 13b. The third module side plate 8c is sandwiched between the second battery cell 13b and the upper sealed box cover 2a. The upper distribution box 15a is sandwiched between Between the side of the first module side plate 8a, the second module side plate 8b and the third module side plate 8c close to the upper distribution box 15a and the side of the upper sealed box cover 2a close to the upper distribution box 15a, two upper power transmission connectors 16a are arranged on the side of the upper distribution box 15a away from the first battery cell 13a and the second battery cell 13b, and two upper connector holes 17a are arranged on the side of the upper sealed box cover 2a close to the upper distribution box 15a. The two upper power transmission connectors 16a pass through the two upper connector holes 17a on the outer side of the upper sealed box cover 2a. An upper air inlet duct hole 18a is provided at the center of 17a, and an upper air outlet duct hole 19a corresponding to the upper air inlet duct hole 18a is provided on the side of the upper sealed box cover 2a away from the upper distribution box 15a; a first battery cell installation cavity 11a is formed between the side of the first module side plate 8a and the second module side plate 8b close to the first battery cell 13a and the side of the upper sealed box cover 2a away from the upper distribution box 15a, and the cavity wall of the first battery cell installation cavity 11a has a supporting force for the first battery cell 13a; the second module side plate 8b and the third module side plate 8c A second battery cell installation cavity 11b is formed between a side close to the second battery cell 13b and a side of the upper sealed box cover 2a away from the upper distribution box 15a, and the cavity wall of the second battery cell installation cavity 11b has a supporting force for the second battery cell 13b; an upper distribution box installation cavity 12a is formed between a side of the first module side panel 8a, a side of the second module side panel 8b and a side of the third module side panel 8c close to the upper distribution box 15a and a side of the upper sealed box cover 2a close to the upper distribution box 15a, and the cavity wall of the upper distribution box installation cavity 12a has a supporting force for the upper distribution box 15a.

[0039] like Fig.10 As shown, the lower battery group 3b includes a third battery cell 13c, a fourth battery cell 13d and a lower distribution box 15b, and the lower side of the central liquid cooling plate 1 is equidistantly connected with a fourth module side plate 8d, a fifth module side plate 8e and a sixth module side plate 8f, the fourth module side plate 8d is sandwiched between the third battery cell 13c and the lower sealed box cover 2b, the fifth module side plate 8e is sandwiched between the third battery cell 13c and the fourth battery cell 13d, the sixth module side plate 8f is sandwiched between the fourth battery cell 13d and the lower sealed box cover 2b, and the lower distribution box 15b is sandwiched between Between the side of the fourth module side plate 8d, the fifth module side plate 8e and the sixth module side plate 8f close to the lower distribution box 15b and the side of the lower sealed box cover 2b close to the lower distribution box 15b, two lower power transmission connectors 16b are arranged on the side of the lower distribution box 15b away from the third battery cell 13c and the fourth battery cell 13d, and two lower connector holes 17b are provided on the side of the lower sealed box cover 2b close to the lower distribution box 15b. The two lower transmission connectors 16b pass through the two lower connector holes 17b on the outer side of the lower sealed box cover 2b. A lower air inlet duct hole 18b is provided at the center of the hole 17b, and a lower air outlet duct hole 19b corresponding to the lower air inlet duct hole 18b is provided on the side of the lower sealed box cover 2b away from the lower distribution box 15b; a third battery cell installation cavity 11c is formed between the side of the fourth module side panel 8d and the fifth module side panel 8e close to the third battery cell 13c and the side of the lower sealed box cover 2b away from the lower distribution box 15b, and the cavity of the third battery cell installation cavity 11c has a supporting force for the third battery cell 13c; the fifth module side panel 8e and the sixth module side panel 8f A fourth battery cell installation cavity 11d is formed between a side close to the fourth battery cell 13d and a side of the lower sealed box cover 2b away from the lower distribution box 15b, and the cavity of the fourth battery cell installation cavity 11d has a supporting force for the fourth battery cell 13d; a lower distribution box installation cavity 12b is formed between a side of the fourth module side panel 8d, a side of the fifth module side panel 8e and a side of the sixth module side panel 8f close to the lower distribution box 15b and a side of the lower sealed box cover 2b close to the lower distribution box 15b, and the cavity wall of the lower distribution box installation cavity 12b has a supporting force for the lower distribution box 15b.

[0040] like Figure 4 and 6As shown, three groups of upper mounting hole groups 5a are equidistantly provided on the upper side of the central liquid cooling plate 1, and each of the upper mounting hole groups 5a includes a number of mounting holes 51. The first module side panel 8a, the second module side panel 8b and the third module side panel 8c are installed to the upper side of the central liquid cooling plate 1 through the three groups of upper mounting hole groups 5a, and the first module side panel 8a, the second module side panel 8b and the third module side panel 8c are all located within the encirclement of the upper sealing frame 20a; three groups of lower mounting hole groups 5b are equidistantly provided on the lower side of the central liquid cooling plate 1, and each of the lower mounting hole groups 5b includes a number of mounting holes 51. The fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f are installed to the lower side of the central liquid cooling plate 1 through the three groups of lower mounting hole groups 5b, and the fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f are all located within the encirclement of the lower sealing frame 20b.

[0041] like Figure 6 As shown, since an upper heat spreader 27a is provided between the upper cell group 3a and the upper sealed box cover 2a, in order to ensure that the upper heat spreader 27a can effectively heat the upper cell group 3a, it is necessary to closely contact the lower side of the upper heat spreader 27a with the upper sides of the first cell 13a and the second cell 13b. Therefore, a plurality of process grooves 81 are evenly spaced on the side of the first module side plate 8a, the second module side plate 8b and the third module side plate 8c away from the central liquid cooling plate 1. A connecting hole 82 is provided through the bottom of each process groove 81. Each connecting hole 82 is coaxially arranged with each mounting hole 51 and is locked by a locking member.

[0042] Since a lower heat spreader 27b is provided between the lower cell group 3b and the lower sealed box cover 2b, in order to ensure that the lower heat spreader 27b can effectively heat the lower cell group 3b, the upper side of the lower heat spreader 27b needs to be in close contact with the lower sides of the third cell 13c and the fourth cell 13d. Therefore, a plurality of process grooves 81 are evenly spaced on the side of the fourth module side plate 8d, the fifth module side plate 8e and the sixth module side plate 8f close to the lower sealed box body 2b. A connecting hole 82 is provided through the bottom of each process groove 81. Each connecting hole 82 is coaxially arranged with each mounting hole 51 and is locked by a locking member.

[0043] A plurality of upper heat spreader connection holes 84a are provided on the side of the first module side plate 8a and the third module side plate 8c close to the upper sealed box cover 2a, and the first battery cell 13a and the second battery cell 13b are connected to the upper heat spreader 27a through the plurality of upper heat spreader connection holes 84a on the side of the first module side plate 8a and the third module side plate 8c, so that the lower side of the upper heat spreader 27a is in close contact with the upper side of the first battery cell 13a and the second battery cell 13b;

[0044] A plurality of lower heat spreader connection holes 84b are provided on the side of the fourth module side panel 8d and the sixth module side panel 8f close to the lower sealed box cover 2b, and the side of the third battery cell 13c and the fourth battery cell 13d close to the lower sealed box cover 2b are connected to the lower heat spreader 27b through the plurality of lower heat spreader connection holes 84b, and one end of a plurality of fasteners passes through the lower surface of the lower heat spreader 27b and cooperates with the respective lower heat spreader connection holes 84b on the fourth module side panel 8d and the sixth module side panel 8f, so that the upper side of the lower heat spreader 27b is in close contact with the lower side of the third battery cell 13c and the fourth battery cell 13d.

[0045] There are at least six process slots 81 on the second module side plate 8b, and the six process slots 81 are respectively the first process slot 81a, the second process slot 81b, the third process slot 81c, the fourth process slot 81d, the fifth process slot 81e and the sixth process slot 81f. The first process slot 81a, the second process slot 81b, the third process slot 81c, the fourth process slot 81d, the fifth process slot 81e and the sixth process slot 81f divide the side of the second module side plate 8b away from the central liquid cooling plate 1 into seven sections of side plates, which are respectively the first section side plate 83a, the second section side plate 83b, the third section side plate 83c, the fourth section side plate 83d, the fifth section side plate 83e, the sixth section side plate 83f and the seventh section side plate 83g;

[0046] The first side plate 83a, the third side plate 83c, the fifth side plate 83e and the seventh side plate 83g are respectively provided with a first air guide groove 85a, a third air guide groove 85c, a fifth air guide groove 85e and a seventh air guide groove 85g on the side close to the first battery cell 13a; the second side plate 83b, the fourth side plate 83d and the sixth side plate 83f are respectively provided with a second air guide groove 85b, a fourth air guide groove 85d and a sixth air guide groove 85f on the side close to the second battery cell 13b; When the second module side plate 8b is sandwiched between the first battery cell 13a and the second battery cell 13b, a first battery cell cooling air duct is formed between the side of the first battery cell 13a close to the second module side plate 8b and the first air guide groove 85a, the third air guide groove 85c, the fifth air guide groove 85e and the seventh air guide groove 85g; a second battery cell cooling air duct is formed between the side of the second battery cell 13c close to the second module side plate 8b and the second air guide groove 85b, the fourth air guide groove 85d and the sixth air guide groove 85f;

[0047] The side of the first section side panel 83a close to the upper distribution box 15a is connected to the upper air inlet duct 24a, and the side of the seventh section side panel 83g close to the upper sealing box cover 2a is connected to the upper air outlet duct 25a; the air inlet end of the upper air inlet duct 24a is connected to the air outlet end of the vehicle-borne circulating air cooling system, the end of the first air guide groove 85a away from the first process groove 81a is connected to the air outlet end of the upper air inlet duct 24a, the end of the seventh air guide groove 85g away from the sixth process groove 81f is connected to the air inlet end of the upper air outlet duct 25a, and the air outlet end of the upper air outlet duct 25a is connected to the air inlet end of the vehicle-borne circulating air cooling system.

[0048] The fifth module side plate 8e is located between the fourth module side plate 8d and the sixth module side plate 8f. The six process slots 81 on the fifth module side plate 8e are respectively the seventh process slot 81g, the eighth process slot 81h, the ninth process slot 81j, the tenth process slot 81k, the eleventh process slot 81m and the twelfth process slot 81n. The seventh process slot 81g, the eighth process slot 81h, the ninth process slot 81j, the tenth process slot 81k, the eleventh process slot 81m and the twelfth process slot 81n divide the side of the fifth module side plate 8e away from the central liquid cooling plate 1 into seven sections of side plates, namely the eighth section side plate 83h, the ninth section side plate 83j, the tenth section side plate 83k, the eleventh section side plate 83m, the twelfth section side plate 83n, the thirteenth section side plate 83o and the fourteenth section side plate 83p.

[0049] The eighth side plate 83h, the tenth side plate 83k, the twelfth side plate 83n and the fourteenth side plate 83p are respectively provided with an eighth air guide groove 85h, a tenth air guide groove 85k, a twelfth air guide groove 85n and a fourteenth air guide groove 85p on the side close to the third battery cell 13c; the ninth side plate 83j, the eleventh side plate 83m and the thirteenth side plate 83o are respectively provided with a ninth air guide groove 85j, an eleventh air guide groove 85m and a thirteenth air guide groove 85o on the side close to the fourth battery cell 13d;

[0050] When the fifth module side plate 8e is sandwiched between the third battery cell 13c and the fourth battery cell 13d, the third battery cell 13c near the side of the fifth module side plate 8e and the eighth air guide groove 85h, the tenth air guide groove 85k, the twelfth air guide groove 85n and the fourteenth air guide groove 85p all form a third battery cell cooling air duct; the fourth battery cell 13d near the side of the fifth module side plate 8e and the ninth air guide groove 85j, the eleventh air guide groove 85m and the thirteenth air guide groove 85o all form a fourth battery cell cooling air duct;

[0051] The side of the eighth section side panel 83h close to the lower distribution box 15b is connected to the lower air inlet duct 24b, and the side of the fourteenth section side panel 83p close to the lower sealing box cover 2b is connected to the lower air outlet duct 25b; the air inlet end of the lower air inlet duct 24b is connected to the air outlet end of the vehicle-borne circulating air cooling system, the end of the eighth air guide groove 85h away from the seventh process groove 81g is connected to the air outlet end of the lower air inlet duct 24b, the end of the fourteenth air guide groove 85p away from the twelfth process groove 81n is connected to the air inlet end of the lower air outlet duct 25b, and the air outlet end of the upper air outlet duct 25a is connected to the air inlet end of the vehicle-borne circulating air cooling system.

[0052] The cold air flows out from the two air outlet ends of the vehicle-mounted circulating air cooling system flow into the upper battery cell cavity 10a and the lower battery cell cavity 10b respectively through the upper air inlet duct 24a and the lower air inlet duct 24b, and the cold air flows out from the air outlet end of the upper air inlet duct 24a flow through the first air guide groove 85a on the first section side panel 83a, the first process groove 81a, the second air guide groove 85b on the second section side panel 83b, the second process groove 81b, the third air guide groove 85c on the third section side panel 83c, the third process groove 81c, the fourth air guide groove 85d on the fourth section side panel 83d, the fourth process groove 81d, the fifth air guide groove 85e on the fifth section side panel 83e, the fifth process groove 81e, and the sixth section side panel 83f. The sixth air guide groove 85f, the sixth process groove 81f and the seventh air guide groove 85g on the seventh section side plate 83g finally flow from the upper air outlet 25a into the vehicle-mounted circulating air cooling system for re-cooling. In this process, the cold air flow can dissipate heat on the side of the first battery cell 13a and the second battery cell 13b close to the second module side plate 8b, so that the temperature of the side of the first battery cell 13a and the second battery cell 13b close to the second module side plate 8b is similar to the temperature of the side of the first battery cell 13a and the second battery cell 13b away from the second module side plate 8b, thereby preventing the first battery cell 13a and the second battery cell 13b from malfunctioning due to the uneven temperature of the first battery cell 13a and the second battery cell 13b;

[0053] Similarly, the cold air flow flowing out from the air outlet end of the lower air inlet duct 24b flows sequentially through the eighth air guide groove 85h on the eighth section side panel 83h, the seventh process groove 81g, the ninth air guide groove 85j on the ninth section side panel 83j, the eighth process groove 81h, the tenth air guide groove 85k on the tenth section side panel 83k, the ninth process groove 81j, the eleventh air guide groove 85m on the eleventh section side panel 83m, the tenth process groove 81k, the twelfth air guide groove 85n on the twelfth section side panel 83n, the eleventh process groove 81m, the thirteenth air guide groove 85f on the thirteenth section side panel 83o, the twelfth process groove 81n and the fourteenth section side panel 83 p, and finally flows from the lower air outlet duct 25b into the vehicle-mounted circulating air cooling system for recooling. During this process, the cold air flow can dissipate heat to the side of the third battery cell 13c and the fourth battery cell 13d close to the fifth module side panel 8e, so that the temperature of the third battery cell 13c and the fourth battery cell 13d close to the fifth module side panel 8e is close to the temperature of the third battery cell 13c and the fifth battery cell 13d away from the fifth module side panel 8e, thereby preventing the third battery cell 13c and the fourth battery cell 13d from malfunctioning due to the uneven temperature of the third battery cell 13c and the fourth battery cell 13d.

[0054] The processing steps of a centrally loaded high-efficiency liquid-cooled heat dissipation battery box of the present invention are as follows:

[0055] S1: stamping and manufacturing the central liquid cooling plate 1 , and opening a mounting hole 51 and a hoisting hole 22 on the central liquid cooling plate 1 .

[0056] S2 : Install the upper sealing frame 20 a to the upper side of the central liquid cooling plate 1 .

[0057] S3: The first module side panel 8a, the second module side panel 8b and the third module side panel 8c are installed to the upper side of the central liquid cooling plate 1 through three groups of mounting hole groups 5a, and the first module side panel 8a, the second module side panel 8b and the third module side panel 8c are all located within the enclosing range of the upper sealing frame 20a.

[0058] S4: The fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f are installed to the lower side of the central liquid cooling plate 1 through the three groups of upper mounting hole groups 5a, and the fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f are all located within the enclosing range of the lower sealing frame 20b.

[0059] S5: The first battery cell 13a is clamped and installed between the first module side plate 8a and the second module side plate 8b, the second battery cell 13b is clamped and installed between the second module side plate 8b and the third module side plate 8c, and the upper distribution box 15a is installed on the upper distribution box mounting plate 21a.

[0060] S6: Install the two upper power transmission connectors 16a on the side of the upper distribution box 15a away from the first battery cell 13a and the second battery cell 13b.

[0061] S7: The upper sealing box cover 2a is sealed and mounted on the upper sealing frame 20a by means of sealing fasteners. At this time, an upper cell mounting cavity 10a is formed between the upper sealing box cover 2a and the central liquid cooling plate 1 .

[0062] S8: The central liquid cooling plate is turned over 180° by a robot arm, and the lower sealing frame 20 b is installed to the lower side of the central liquid cooling plate 1 .

[0063] S9: The fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f are respectively installed to the lower side of the central liquid cooling plate 1 through the three groups of lower mounting hole groups 5b, and the fourth module side panel 8d, the fifth module side panel 8e and the sixth module side panel 8f are all located within the enclosing range of the lower sealing frame 20b.

[0064] S10: The third battery cell 13c is clamped and installed between the fourth module side plate 8d and the fifth module side plate 8e, the fourth battery cell 13d is clamped and installed between the fifth module side plate 8e and the sixth module side plate 8f, and the lower distribution box 15b is installed on the lower distribution box mounting plate 21b.

[0065] S11: Install the two lower power transmission connectors 16b on the side of the lower distribution box 15b away from the third battery cell 13c and the fourth battery cell 13d.

[0066] S12: The lower sealing box cover 2b is sealed and installed on the lower sealing frame 20b by means of sealing fasteners. At this time, a lower battery cell installation cavity 10b is formed between the lower sealing box cover 2b and the central liquid cooling plate 1.

[0067] like Fig.11 and 12As shown, a centrally-loaded high-efficiency liquid-cooled heat dissipation battery box according to the present invention can be assembled side by side or in stacks according to the shape of the battery compartment of the vehicle frame. A plurality of lifting holes 22 are equidistantly provided on the four sides of the central liquid-cooled plate 1. A side-by-side connecting plate 23 is provided between any two adjacent centrally-loaded high-efficiency liquid-cooled heat dissipation battery boxes of the present invention that are combined side by side. A plurality of lifting holes on one side of two adjacent centrally-loaded high-efficiency liquid-cooled heat dissipation battery boxes of the present invention that are close to each other are connected to both sides of the side-by-side connecting plate by cooperation with a plurality of fasteners. A stacking connecting frame 26 is provided between any two adjacent centrally-loaded high-efficiency liquid-cooled heat dissipation battery boxes of the present invention that are stacked. The lifting holes 22 on the central liquid-cooled plates 1 of two adjacent centrally-loaded high-efficiency liquid-cooled heat dissipation battery boxes of the present invention are respectively connected to the upper and lower ends of the stacking connecting frame 26 by fasteners. Such a design can prevent the entire vehicle from losing power due to a failure of a battery cell in a battery box, thereby providing a more reliable power source for new energy electric vehicles.

[0068] The above are preferred embodiments of the present invention. It should be pointed out that a person skilled in the art may make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A centrally loaded, high-efficiency liquid-cooled heat dissipation battery box, characterized in that: The invention comprises a central liquid cooling plate (1), an upper sealed box cover (2a), a lower sealed box cover (2b), an upper battery cell group (3a) and a lower battery cell group (3b); the upper sealed box cover (2a) and the lower sealed box cover (2b) are located at the upper and lower sides of the central liquid cooling plate (1); an upper battery cell cavity (10a) is formed between the upper sealed box cover (2a) and the central liquid cooling plate (1); a lower battery cell cavity (10b) is formed between the lower sealed box cover (2b) and the central liquid cooling plate (1); the upper battery cell group (3a) is installed in the upper battery cell cavity (10a); and the lower battery cell group (3b) is installed in the lower battery cell cavity (10b).

2. According to claim 1, a centrally loaded high-efficiency liquid-cooled heat dissipation battery box is characterized by: The upper battery cell group (3a) comprises a first battery cell (13a), a second battery cell (13b) and an upper distribution box (15a); the upper side of the central liquid cooling plate (1) is equidistantly connected with a first module side plate (8a), a second module side plate (8b) and a third module side plate (8c); the first module side plate (8a) is sandwiched between the first battery cell (13a) and the upper sealed box cover (2a); the second module side plate (8b) is sandwiched between the first battery cell (13a) and the second battery cell (13b); and the third module side plate (8c) is sandwiched between the second battery cell (13b) and the upper sealed box cover (2a).

3. According to claim 1, a centrally loaded high-efficiency liquid-cooled heat dissipation battery box is characterized in that: The lower battery cell group (3b) comprises a third battery cell (13c), a fourth battery cell (13d) and a lower distribution box (15b); the lower side of the central liquid cooling plate (1) is equidistantly connected with a fourth module side plate (8d), a fifth module side plate (8e) and a sixth module side plate (8f); the fourth module side plate (8d) is sandwiched between the third battery cell (13c) and the lower sealed box cover (2b); the fifth module side plate (8e) is sandwiched between the third battery cell (13c) and the fourth battery cell (13d); and the sixth module side plate (8f) is sandwiched between the fourth battery cell (13d) and the lower sealed box cover (2b).

4. According to claim 1, a centrally loaded high-efficiency liquid-cooled heat dissipation battery box is characterized in that: The upper side of the central liquid cooling plate (1) is provided with three groups of upper mounting holes (5a) at equal intervals, each of the groups of upper mounting holes (5a) comprising a plurality of mounting holes (51), and the first module side plate (8a), the second module side plate (8b) and the third module side plate (8c) are mounted to the upper side of the central liquid cooling plate (1) through the three groups of upper mounting holes (5a); the lower side of the central liquid cooling plate (1) is provided with three groups of lower mounting holes (5b) at equal intervals, each of the groups of lower mounting holes (5b) comprising a plurality of mounting holes (51), and the fourth module side plate (8d), the fifth module side plate (8e) and the sixth module side plate (8f) are mounted to the lower side of the central liquid cooling plate (1) through the three groups of lower mounting holes (5b).

5. According to claim 1, a centrally loaded high-efficiency liquid-cooled heat dissipation battery box is characterized in that: A plurality of process grooves (81) are equidistantly provided on the side of the first module side plate (8a), the second module side plate (8b) and the third module side plate (8c) away from the central liquid cooling plate (1), and a connection hole (82) is provided through the bottom of each process groove (81), and each connection hole (82) is coaxially arranged with each mounting hole (51) and is locked by a locking member; a plurality of process grooves (81) are equidistantly provided on the side of the fourth module side plate (8d), the fifth module side plate (8e) and the sixth module side plate (8f) close to the lower sealing box body (2b), and a connection hole (82) is provided through the bottom of each process groove (81), and each connection hole (82) is coaxially arranged with each mounting hole (51) and is locked by a locking member.

6. A centrally loaded high-efficiency liquid-cooled heat dissipation battery box according to claim 1, characterized in that: An upper sealing frame (20a) and a lower sealing frame (20b) are respectively installed on the upper and lower sides of the central liquid cooling plate (1); the upper sealing frame (20a) and the lower sealing frame (20b) are respectively connected to an upper distribution box mounting plate (21a) and a lower distribution box mounting plate (21b).

7. The centrally loaded high-efficiency liquid-cooled heat dissipation battery box according to claim 1 is characterized in that: A plurality of upper heat spreader plate connection holes (84a) are provided on the side of the first module side plate (8a) and the third module side plate (8c) close to the upper sealed box cover (2a); the side of the first battery cell (13a) and the second battery cell (13b) close to the upper sealed box cover (2a) are connected to the upper heat spreader plate (27a) through the plurality of upper heat spreader plate connection holes (84a); a plurality of lower heat spreader plate connection holes are provided on the side of the fourth module side plate (8d) and the sixth module side plate (8f) close to the lower sealed box cover (2b); the side of the third battery cell (13c) and the fourth battery cell (13d) close to the lower sealed box cover (2b) are connected to the lower heat spreader plate (27b) through the plurality of lower heat spreader plate connection holes.

8. The centrally loaded high-efficiency liquid-cooled heat dissipation battery box according to claim 2 is characterized in that: The second module side plate (8b) has at least six process slots (81), the six process slots (81) are respectively a first process slot (81a), a second process slot (81b), a third process slot (81c), a fourth process slot (81d), a fifth process slot (81e) and a sixth process slot (81f); the first process slot (81a), the second process slot (81b), the third process slot (81c), the fourth process slot (81d), the fifth process slot (81e) and the sixth process slot (81f) divide the side of the second module side plate (8b) away from the central liquid cooling plate (1) into seven sections of side plates, namely a first section of side plate (83a), a second section of side plate (83b), a third section of side plate (83c), a fourth section of side plate (83d), a fifth section of side plate (83e), a sixth section of side plate (83f) and a seventh section of side plate (83g); The first section side plate (83a), the third section side plate (83c), the fifth section side plate (83e) and the seventh section side plate (83g) are respectively provided with a first air guide groove (85a), a third air guide groove (85c), a fifth air guide groove (85e) and a seventh air guide groove (85g) on ​​a side close to the first battery cell (13a); the second section side plate (83b), the fourth section side plate (83d) and the sixth section side plate (83f) are respectively provided with a second air guide groove (85b), a fourth air guide groove (85d) and a sixth air guide groove (85f) on a side close to the second battery cell (13b); The side of the first section side plate (83a) close to the upper distribution box (15a) is connected to the upper air inlet duct (24a), and the side of the seventh section side plate (83g) close to the upper sealing box cover (2a) is connected to the upper air outlet duct (25a); the end of the first air guide groove (85a) away from the first process groove (81a) is connected to the air outlet end of the upper air inlet duct (24a), and the end of the seventh air guide groove (85g) away from the sixth process groove (81f) is connected to the air inlet end of the upper air outlet duct (25a).

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