Double-layer battery pack box body and double-layer battery pack

Abstract

The utility model provides a double-layer battery pack box body and a double-layer battery pack, and belongs to the technical field of battery manufacturing. The double-layer battery pack box body comprises an upper box body and a lower box body, the lower box body comprises a bottom plate and peripheral side plates, an upper-layer liquid cooling plate is fixed to a top opening defined by the peripheral side plates through threaded fasteners, and fixing edges fixedly connected with the peripheral side plates of the lower box body are arranged on the peripheral edges of the upper-layer liquid cooling plate respectively. The top surfaces of the peripheral side plates of the lower box body are supporting surfaces for supporting the fixed edges, mounting holes for mounting the threaded fasteners are formed in the supporting surfaces, positioning columns are arranged on one of the supporting surfaces and the fixed edges, and positioning holes for inserting the positioning columns to position the upper-layer liquid cooling plate when the upper-layer liquid cooling plate is mounted are formed in the other one of the supporting surfaces and the fixed edges. Sinking groove structures at the top ends of the side plates on the periphery are omitted, the top faces of the side plates are directly used for supporting the upper-layer liquid cooling plate, the wall thickness of the side plates can be reduced, the weight of the side plates can be reduced, and the energy density of the battery pack can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a double -deck battery package box and double -deck battery package belong to battery manufacturing technical field. BACKGROUND

[0002] With the gradual development of new energy vehicle technology, consumers pay more and more attention to the vehicle's range. The energy density of the battery pack is an important indicator affecting the vehicle's range. At present, many manufacturers are committed to improving the energy density of the battery pack, thus the double-layer battery pack appears. For example, a double-layer battery box structure and double-layer battery are disclosed in Chinese patent application publication No. CN117878478A, wherein the double-layer battery box comprises an upper box and a lower box, the lower box is provided with a lower liquid cooling plate at the bottom, the upper end opening of the lower box is provided with an upper liquid cooling plate, the upper box is sealed and buckled above the lower box, and the space for accommodating the battery module is surrounded between the upper liquid cooling plate and the lower box and between the upper box and the upper liquid cooling plate. In addition, the top edge of the lower box is provided with a groove, the upper liquid cooling plate is installed in the groove through connecting screws, and the upper and lower boxes are respectively provided with butt flanges, and the upper and lower butt flanges are fixed through bolts.

[0003] The above-mentioned upper liquid cooling plate is installed in the groove at the top edge of the lower box, which is an internal installation mode, and the size of the groove is matched with the upper liquid cooling plate, so that the upper liquid cooling plate can be positioned. Since the groove bottom needs to support the upper liquid cooling plate and needs to be provided with a threaded hole, the groove must have a certain horizontal width. Since the groove is arranged on the side plate of the lower box, the side plate must have sufficient wall thickness, which increases the weight of the side plate and affects the energy density of the battery pack. At the same time, the side plate needs to be provided with a butt flange to connect with the upper box, which leads to a larger size of the lower box in the width direction, and further leads to a lower energy density of the battery pack. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a double-layer battery pack box to solve the problem that the upper liquid cooling plate in the prior art is installed in a hidden way, a groove needs to be arranged on the top edge of the lower box, which leads to an excessively large thickness and heavy weight of the side plate of the lower box, and further leads to a low energy density of the battery pack. The utility model also aims at providing a double-layer battery pack to solve the above-mentioned problem.

[0005] To achieve the above-mentioned purpose, the double-layer battery pack box in the utility model adopts the following technical scheme:

[0006] The utility model provides a double -deck battery package box body, including upper box body and lower box body, and the lower box body includes bottom plate and four around side plates, and the upper layer liquid cooling plate is fixed with the upper layer liquid cooling plate through the threaded fastener at the top opening surrounded by four around side plates, and the four around edges of the upper layer liquid cooling plate are provided with the fixed edge fixed connection with four around side plates of the lower box body respectively, and the top surface of four around side plates of the lower box body is the support surface for supporting the fixed edge and is provided with the mounting hole for installing the threaded fastener, and one of the support surface and the fixed edge is provided with the locating post, and the other is provided with the locating hole for inserting the locating post to position the upper layer liquid cooling plate when installing.

[0007] The utility model belongs to the invention of factor change, mainly change the shape of lower box body side plate and the fixed position of upper layer liquid cooling plate relative to lower box body side plate, wherein the top surface of four around side plates of the lower box body is the support surface for supporting the four around fixed edge of the upper layer liquid cooling plate, cancel the sink structure of the top end of four around side plates, directly utilize the top surface of side plate to support the upper layer liquid cooling plate, thereby can reduce the wall thickness of side plate, reduce the weight of side plate, is favorable to improving the energy density of battery package.

[0008] Further, the locating post and the locating hole are respectively cylindrical and are provided with two respectively.

[0009] Further, the upper layer liquid cooling plate comprises a liquid cooling plate body and a front flow passage block and a rear flow passage block fixed at the front and rear ends of the liquid cooling plate body respectively, and the left and right side edges of the liquid cooling plate body are respectively integrally provided with fixed edges, and the front flow passage block and the rear flow passage block are respectively integrally provided with fixed edges.

[0010] Further, the front flow passage block is fixed with a front panel, and the rear flow passage block is fixed with a rear panel, and the top surface and the left and right side surfaces of the front panel and the rear panel are respectively provided with threaded holes, and the upper box body is n-shaped, and the upper box body comprises a top plate and a left panel and a right panel connected with the top plate, and the top plate, the left panel and the right panel are respectively fixed on the top surface and the left and right side surfaces of the front panel and the rear panel through screws, and the front flow passage block is provided with a water inlet nozzle and a water outlet nozzle located in front of the front panel.

[0011] Further, the front panel and the rear panel are respectively provided with an assembly operation hole, and the double-layer battery pack box further comprises a sealing plate respectively fixed on the front panel and the rear panel and covering the corresponding assembly operation hole.

[0012] Further, the front side plate or / and the rear side plate of the lower box body is provided with an assembly operation hole, and the lower box body further comprises a sealing plate fixed on the corresponding side plate to cover the assembly operation hole on the side plate.

[0013] Further, the bottom plate of the lower box body is a lower liquid cooling plate, the upper liquid cooling plate and the lower liquid cooling plate each comprise a liquid cooling plate body and a front flow channel stopper and a rear flow channel stopper respectively fixed on the front end and the rear end of the liquid cooling plate body, the front flow channel stopper of the upper liquid cooling plate and the lower liquid cooling plate is respectively provided with a water inlet nozzle and a water outlet nozzle which are forwardly overhanging, the water inlet nozzle of the upper liquid cooling plate is located directly above the water outlet nozzle of the lower liquid cooling plate, the water outlet nozzle of the upper liquid cooling plate is located directly above the water inlet nozzle of the lower liquid cooling plate, and the water outlet nozzle of the upper liquid cooling plate and the water inlet nozzle of the lower liquid cooling plate are communicated through a water pipe or the water outlet nozzle of the lower liquid cooling plate and the water inlet nozzle of the upper liquid cooling plate are communicated through a water pipe.

[0014] Further, the front flow channel stopper of the upper liquid cooling plate is integrally provided with a fixing edge, and the edge of the fixing edge and the supporting surface below the fixing edge is respectively provided with an avoiding recess for avoiding the water pipe.

[0015] Further, the front flow channel stopper of the upper liquid cooling plate is integrally provided with a fixing edge, and the edge of the fixing edge and the supporting surface below the fixing edge is respectively provided with an avoiding recess for avoiding the water pipe.

[0016] To achieve the above object, the double-layer battery pack in the utility model adopts the following technical scheme:

[0017] The double-layer battery pack comprises a box body and a battery arranged in the box body, the box body comprises an upper box body and a lower box body, the lower box body comprises a bottom plate and four surrounding side plates, the upper liquid cooling plate is fixed on the top opening surrounded by the four surrounding side plates through a threaded fastener, the four surrounding edges of the upper liquid cooling plate are provided with fixing edges which are respectively fixedly connected with the four surrounding side plates of the lower box body, the top surface of the four surrounding side plates of the lower box body is a supporting surface for supporting the fixing edges and is provided with mounting holes for mounting the threaded fastener, one of the supporting surface and the fixing edges is provided with a positioning column, and the other is provided with a positioning hole into which the positioning column is inserted to position the upper liquid cooling plate when the upper liquid cooling plate is mounted.

[0018] The beneficial effects of the above technical scheme are that the utility model belongs to an improved invention, the structure of the box is further limited, the shape of the lower box side plate and the fixed position of the upper liquid cooling plate relative to the lower box side plate are different from the prior art, wherein the top surface of the four peripheral side plates of the lower box is a support surface for supporting the four peripheral fixed edges of the upper liquid cooling plate, the sink structure at the top end of the four peripheral side plates is cancelled, the top surface of the side plate is directly used to support the upper liquid cooling plate, thereby the wall thickness of the side plate can be reduced, the weight of the side plate is lightened, and the energy density of the battery pack is improved. The four peripheral fixed edges of the upper liquid cooling plate can be directly placed on the top surface of the four peripheral side plates of the lower box, the mounting holes for mounting the threaded fasteners are arranged on the top surface, and the fixing of the upper liquid cooling plate is realized. At the same time, since the four peripheral side plates cancel the sink structure in the prior art, in order to ensure that the four peripheral side plates can also position the upper liquid cooling plate, a positioning column is arranged on one of the support surface and the fixed edge, and a positioning hole for inserting the positioning column is arranged on the other one, so that the upper liquid cooling plate can be positioned when being installed, assembly operation is facilitated, and the original positioning function is ensured not to be lost.

[0019] Further, the positioning column and the positioning hole are respectively cylindrical and two are arranged respectively.

[0020] Further, the upper liquid cooling plate comprises a liquid cooling plate body and front and rear flow channel blocks fixed at the front and rear ends of the liquid cooling plate body respectively, and the left and right side edges of the liquid cooling plate body are respectively integrally provided with fixed edges, and the front and rear flow channel blocks are respectively integrally provided with fixed edges.

[0021] Further, the front flow channel block is fixed with a front panel, and the rear flow channel block is fixed with a rear panel, screw holes are arranged on the top surface and the left and right side surfaces of the front panel and the rear panel, the upper box is n-shaped, and the upper box comprises a top plate and left and right panels connected with the top plate, and the top plate, the left panel and the right panel are fixed on the top surface and the left and right side surfaces of the front panel and the rear panel through screws, and the front flow channel block is provided with a water inlet nozzle and a water outlet nozzle located at the front side of the front panel.

[0022] Further, assembly operation holes are arranged on the front panel and the rear panel respectively, and the double-layer battery pack box further comprises sealing plates fixed on the front panel and the rear panel respectively and covering the corresponding assembly operation holes.

[0023] Further, assembly operation holes are arranged on the front side plate and / or the rear side plate of the lower box, and the lower box further comprises sealing plates fixed on the corresponding side plates to cover the assembly operation holes on the side plates.

[0024] Further, the bottom plate of the lower box body is a lower liquid cooling plate, the upper liquid cooling plate and the lower liquid cooling plate each comprise a liquid cooling plate body and a front flow passage block and a rear flow passage block fixed at the front and rear ends of the liquid cooling plate body respectively, the front flow passage block of the upper liquid cooling plate and the lower liquid cooling plate is respectively provided with a water inlet nozzle and a water outlet nozzle which are suspended forward, the water inlet nozzle of the upper liquid cooling plate is located directly above the water outlet nozzle of the lower liquid cooling plate, the water outlet nozzle of the upper liquid cooling plate is located directly above the water inlet nozzle of the lower liquid cooling plate, and the water outlet nozzle of the upper liquid cooling plate and the water inlet nozzle of the lower liquid cooling plate are communicated through a water pipe or the water outlet nozzle of the lower liquid cooling plate and the water inlet nozzle of the upper liquid cooling plate are communicated through a water pipe.

[0025] Further, the front flow passage block of the upper liquid cooling plate is integrally provided with a fixing edge, and the edges of the fixing edge and the support surface below the fixing edge are each provided with an avoiding notch for avoiding the water pipe.

[0026] Further, the front flow passage block of the upper liquid cooling plate is integrally provided with a fixing edge, and the edges of the fixing edge and the support surface below the fixing edge are each provided with an avoiding notch for avoiding the water pipe. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a perspective exploded view of the double-layer battery pack box body embodiment of the utility model;

[0028] Figure 2 It is a perspective view of the lower box body in the double-layer battery pack box body embodiment of the utility model;

[0029] Figure 3 It is a perspective view of the upper liquid cooling plate, the front panel and the rear panel in the double-layer battery pack box body embodiment of the utility model;

[0030] Figure 4 It is a top view of the front flow passage block of the upper liquid cooling plate in the double-layer battery pack box body embodiment of the utility model;

[0031] Figure 5 It is a side view of the front flow passage block of the upper liquid cooling plate in the double-layer battery pack box body embodiment of the utility model.

[0032] In the figure: 1, lower box body; 11, lower layer liquid cooling plate; 111, lower water inlet nozzle; 112, lower water outlet nozzle; 12, front side plate; 121, lower avoiding gap; 122, lower avoiding groove; 123, front lower assembly operation hole; 13, rear side plate; 14, left side plate; 15, right side plate; 16, positioning column; 2, upper box body; 21, top plate; 22, left panel; 23, right panel; 3, upper layer liquid cooling plate; 31, liquid cooling plate body; 311, left fixed edge; 312, right fixed edge; 313, right vertical surface; 32, front flow channel block; 321, front fixed edge; 322, upper water outlet nozzle; 323, upper water inlet nozzle; 324, upper avoiding gap; 325, upper avoiding groove; 326, module fixing beam; 327, wire passing hole; 33, rear flow channel block; 4, front panel; 41, front upper assembly operation hole; 5, rear panel; 51, rear upper assembly operation hole; 6, front upper sealing plate; 7, rear upper sealing plate; 8, front lower sealing plate. DETAILED DESCRIPTION

[0033] In view of the technical problems existing in the prior art, the basic idea of the utility model is to cancel the sink structure at the top end of the side plate around the lower box body in the prior art, and directly use the top surface of the side plate around to support and fix the upper layer liquid cooling plate, so that the thickness of the side plate is reduced, and the energy density of the battery pack is improved.

[0034] The features and performances of the utility model will be further described in detail in combination with the embodiments.

[0035] Embodiment 1 of the double-layer battery pack box body in the utility model:

[0036] As shown in Figure 1 and Figure 2 , the double-layer battery pack box body comprises an upper box body 2 and a lower box body 1, wherein the lower box body 1 comprises a bottom plate and a side plate around, the bottom plate is a lower layer liquid cooling plate 11, the lower layer liquid cooling plate 11 is used for supporting and fixing a lower layer battery module, and the side plate around is a front side plate 12, a rear side plate 13, a left side plate 14 and a right side plate 15 respectively. The top opening surrounded by the side plate around is fixed with an upper layer liquid cooling plate 3 through a threaded fastener, the upper layer liquid cooling plate 3 is used for supporting and fixing an upper layer battery module, and the four peripheral edges of the upper layer liquid cooling plate 3 are provided with fixed edges which are fixedly connected with the four peripheral side plates of the lower box body 1 respectively. As shown in Figure 3 , the upper layer liquid cooling plate 3 comprises a liquid cooling plate body 31 and a front flow channel block 32 and a rear flow channel block 33 fixed on the front and rear ends of the liquid cooling plate body 31 respectively, the left and right side edges of the liquid cooling plate body 31 are integrally provided with a left fixed edge 311 and a right fixed edge 312 respectively, the front flow channel block 32 is integrally provided with a front fixed edge 321, and the rear flow channel block 33 is integrally provided with a rear fixed edge.

[0037] The top surface of the peripheral side plate of the lower box body 1 is a support surface for supporting the peripheral fixing edge, and the support surface is provided with a mounting hole for mounting the threaded fastener. In this embodiment, the threaded fastener is a screw, so the mounting hole is a threaded hole, and the peripheral fixing edge is provided with a screw hole. Of course, in other embodiments, the threaded fastener can also be a bolt, in which case the top end of the peripheral side plate needs to have an everted edge structure. The bolt passes through the fixing edge and the everted edge and is connected with a nut, and the same can also achieve the fixing of the upper liquid cooling plate 3. In this case, the mounting hole is a bolt hole. However, regardless of the form of the threaded fastener, since the top end of the peripheral side plate cancels the sink structure in the prior art, the top surface of the side plate directly supports the upper liquid cooling plate 3, which can reduce the wall thickness of the side plate and reduce the weight of the side plate, which is conducive to improving the energy density of the battery pack.

[0038] Since the peripheral side plate cancels the sink structure, in order to ensure that the peripheral side plate can also position the upper liquid cooling plate 3, one of the support surface and the fixing edge is provided with a positioning column, and the other is provided with a positioning hole for inserting the positioning column. In this embodiment, as shown in Figure 2 , the positioning column 16 is provided on the support surface, so the positioning hole is provided on the fixing edge, and the positioning column 16 and the positioning hole are respectively cylindrical and are respectively provided with two. The two positioning columns 16 are respectively arranged at the diagonal positions of the peripheral side plate of the lower box body 1, and the corresponding positioning holes are arranged at the diagonal positions of the peripheral fixing edge of the upper liquid cooling plate 3, so that the upper liquid cooling plate 3 can be positioned when it is installed, facilitating assembly operation and ensuring that the original positioning function is not lost.

[0039] As shown in Figure 1 and Figure 3 , the front flow channel block 32 is fixed with the front panel 4, and the rear flow channel block 33 is fixed with the rear panel 5. The top surface and the left and right side surfaces of the front panel 4 and the rear panel 5 are respectively provided with threaded holes. The upper box body 2 is n-shaped, and the upper box body 2 includes a top plate 21 and left and right side plates 22 and 23 connected with the top plate 21. The front and rear ends of the top plate 21, the left side plate 22 and the right side plate 23 are respectively fixed on the top surface and the left and right side surfaces of the front panel 4 and the rear panel 5 by screws, achieving the fixing between the upper box body 2 and the front panel 4 and the rear panel 5. At the same time, the left side of the liquid cooling plate body 31 has a left vertical surface perpendicular to the left fixing edge 311, and the right side has a right vertical surface 313 perpendicular to the right fixing edge 312. The left and right vertical surfaces are also provided with threaded holes, and the bottom of the left side plate 22 and the right side plate 23 are respectively fixed and connected with the left and right vertical surfaces by screws, achieving the fixing between the upper box body 2 and the upper liquid cooling plate 3.

[0040] In fact, the lower liquid cooling plate 11 also includes a liquid cooling plate body and front and rear flow channel blocks fixed at the front and rear ends of the liquid cooling plate body, and as shown in Figure 2As shown, the front flow channel block of the lower liquid cooling plate 11 is provided with a lower water inlet nozzle 111 and a lower water outlet nozzle 112 which are suspended forward. Figure 3 , Figure 4 and Figure 5 As shown, the front flow channel block 32 of the upper liquid cooling plate 3 is provided with an upper water inlet nozzle 323 and an upper water outlet nozzle 322 which are suspended forward, and the upper water inlet nozzle 323 and the upper water outlet nozzle 322 are located above the front fixed edge 321, and the shape design of the upper cabinet 2 does not block the water nozzles, so there is no need to open water nozzle perforations on the upper cabinet and set sealing measures, and the structure is simpler and the assembly is more convenient. Of course, the front panel 4 is fixed above the front flow channel block 32, and the water nozzles are not blocked, and the structure is simple and compact.

[0041] Further, the upper water inlet nozzle 323 is located directly above the lower water outlet nozzle 112, and the upper water outlet nozzle 322 is located directly above the lower water inlet nozzle 111, and the upper water outlet nozzle 322 and the lower water inlet nozzle 111 are used to communicate through the water pipe, at this time the upper water inlet nozzle 323 is connected with the liquid inlet pipe of the liquid cooling system, and the lower water outlet nozzle 112 is connected with the liquid outlet pipe of the liquid cooling system, or the lower water outlet nozzle 112 and the upper water inlet nozzle 323 are used to communicate through the water pipe, at this time the lower water inlet nozzle 111 is connected with the liquid inlet pipe of the liquid cooling system, and the upper water outlet nozzle 322 is connected with the liquid outlet pipe of the liquid cooling system, realizing the series connection between the upper and lower liquid cooling plates.

[0042] In order to facilitate the arrangement of the water pipe, as shown in Figures 3-5 , upper avoiding notches 324 for avoiding the water pipe are arranged on the front fixed edge 321 corresponding to the upper water inlet nozzle 323 and the upper water outlet nozzle 322, and as shown in Figure 2 , lower avoiding notches 121 for avoiding the water pipe are arranged on the edge of the top supporting surface of the front side plate 12 directly above the lower water inlet nozzle 111 and the lower water outlet nozzle 112, so that the positions corresponding to the water nozzles are left with notches, facilitating the connection of the water pipe according to actual needs. In addition, in order to facilitate the wiring of the cable, two upper avoiding grooves 325 for avoiding the cable are arranged on the front fixed edge 321, and the two upper avoiding grooves 325 are located inside the two upper avoiding notches 324, and two lower avoiding grooves 122 for avoiding the cable are arranged on the edge of the top supporting surface of the front side plate 12, and the upper avoiding grooves 325 and the lower avoiding grooves 122 correspond to each other.

[0043] In addition, as shown in Figure 4 and Figure 5 , the front flow channel block 32 of the upper liquid cooling plate 3 is provided with a module fixing beam 326, and the middle part and the rear flow channel block 33 of the upper liquid cooling plate 3 are also respectively provided with module fixing beams, which are used to fix the upper battery module. Similarly, the front flow channel block, the rear flow channel block and the middle part of the lower liquid cooling plate 11 are also respectively provided with module fixing beams, which are used to fix the lower battery module.

[0044] In addition, since the upper battery module and the lower battery module need to be connected in series, two wire passing holes 327 are arranged on the front flow channel stop block 32 of the upper liquid cooling plate 3 to facilitate internal wiring. The two wire passing holes 327 are respectively located at the left and right ends of the front flow channel stop block 32, and the two wire passing holes 327 are located at the rear side of the front panel 4, so the front panel 4 does not block the two wire passing holes 327.

[0045] In addition, as shown in Figure 3 , assembly operation holes are arranged on the front panel 4 and the rear panel 5, respectively. The front panel 4 is provided with a front upper assembly operation hole 41, and the rear panel 5 is provided with a rear upper assembly operation hole 51, which facilitates wiring operation or lock bolt operation. As shown in Figure 1 , in order to ensure the sealing of the box after assembly operation, the double-layer battery pack box further includes a front upper sealing plate 6 fixed on the front panel 4 and covering the front upper assembly operation hole 41, and a rear upper sealing plate 7 fixed on the rear panel 5 and covering the rear upper assembly operation hole 51, and the fixing mode is screw connection. Similarly, as shown in Figure 2 , a front lower assembly operation hole 123 is arranged on the front side plate 12 of the lower box 1, and the lower box 1 further includes a front lower sealing plate 8 (as shown in Figure 1 ) fixed on the front side plate 12 to cover the front lower assembly operation hole 123 after assembly operation, and the fixing mode is screw connection.

[0046] In other embodiments of the double-layer battery pack box: the front fixed edge of the upper liquid cooling plate and the edge of the top end supporting surface of the front side plate of the lower box are no longer provided with the avoiding groove for avoiding the cable, and the cable can be arranged around the front fixed edge and the edge of the top end supporting surface of the front side plate.

[0047] In other embodiments of the double-layer battery pack box: the front fixed edge of the upper liquid cooling plate and the edge of the top end supporting surface of the front side plate of the lower box are no longer provided with the avoiding notch for avoiding the water pipe, and the water pipe can be arranged around the front fixed edge and the edge of the top end supporting surface of the front side plate.

[0048] In other embodiments of the double-layer battery pack box: the water inlet of the upper liquid cooling plate and the water outlet of the lower liquid cooling plate are no longer vertically aligned, and the water outlet of the upper liquid cooling plate and the water inlet of the lower liquid cooling plate are also no longer vertically aligned. At this time, when the upper liquid cooling plate and the lower liquid cooling plate are connected in series, the water pipe is arranged in an inclined manner, or the upper liquid cooling plate and the lower liquid cooling plate are no longer connected, but are independently connected to the liquid cooling system.

[0049] In other embodiments of the double-layer battery pack box body: the water inlet and outlet nozzles on the upper and lower liquid cooling plates can also extend vertically upward, and in other embodiments, whether the water inlet and outlet nozzles on the upper liquid cooling plate extend forward or upward, the structure of the upper box body can include a top plate and four surrounding panels, at this time the upper liquid cooling plate is a separate plate, and the water inlet and outlet nozzles on the upper liquid cooling plate can still be located on the front side of the front panel of the upper box body, of course, they can also be located on the rear side of the front panel of the upper box body, but water nozzle perforations need to be opened on the upper box body for the water inlet and outlet nozzles to pass through.

[0050] In other embodiments of the double-layer battery pack box body: the assembly operation hole on the lower box body can also be provided on the rear side panel, of course, assembly operation holes can also be provided on both the front and rear side panels, and the corresponding side panels need to be fixed with sealing plates to cover the assembly operation holes on the side panels. In other embodiments, when the space inside the lower box body is sufficient and does not affect assembly operation, assembly operation holes can no longer be provided.

[0051] In other embodiments of the double-layer battery pack box body: when the space between the front and rear panels is sufficient and does not affect assembly operation, assembly operation holes can no longer be provided.

[0052] In other embodiments of the double-layer battery pack box body: the fixing edges on the left and right sides of the upper liquid cooling plate can not be integrally formed on the left and right edges of the liquid cooling plate body, but can be fixed on the edges of the liquid cooling plate body. Similarly, the fixing edges on the front and rear sides of the upper liquid cooling plate can not be integrally formed on the front and rear flow channel blocks, but can be fixed on the front and rear flow channel blocks.

[0053] In other embodiments of the double-layer battery pack box body: the positioning column can be a square column, and the positioning hole can be a square hole that fits, at this time the cooperation of one positioning column and one positioning hole can achieve the positioning of the upper liquid cooling plate, without the need to set two or more.

[0054] In other embodiments of the double-layer battery pack box body: the positioning column can be provided on the fixing edge of the upper liquid cooling plate, and the positioning hole can be provided on the top surface of the side panel of the lower box body.

[0055] In other embodiments of the double-layer battery pack box body: the bottom plate of the lower box body can not be a lower liquid cooling plate, but a normal plate without liquid cooling function, at this time a liquid cooling plate can be additionally provided on the bottom plate.

[0056] In other embodiments of the double-layer battery pack box: when the upper box includes a top plate and four surrounding panels, the lower ends of the surrounding panels can be respectively provided with outward-turned edges, at which time the surrounding outward-turned edges, the surrounding fixed edges of the upper liquid cooling plate, and the surrounding side panels of the lower box can be fixedly connected by the same set of threaded fasteners, and in order to minimize the wall thickness of the side panels of the lower box, the threaded fasteners can be selected to be screws, that is, the mounting holes on the top surfaces of the surrounding side panels of the lower box are threaded holes.

[0057] In other embodiments of the double-layer battery pack box: when the upper box is n-shaped, the bottom ends of the left and right panels of the upper box can be respectively provided with outward-turned edges, at which time the left and right outward-turned edges, the left and right fixed edges of the upper liquid cooling plate, and the left and right side panels of the lower box can be fixedly connected by the same set of threaded fasteners, and the threaded fasteners are preferably selected to be screws, that is, the mounting holes on the top surfaces of the left and right side panels of the lower box are threaded holes.

[0058] In the embodiments of the double-layer battery pack in the utility model, the double-layer battery pack includes a box and batteries arranged in the box, and the box is the same as the double-layer battery pack box in any of the above embodiments, which will not be repeated here.

[0059] The above is only a preferred embodiment of the utility model, and is not used to limit the utility model, and the patent protection range of the utility model is subject to the claims, and equivalent structural changes made by applying the contents of the specification and drawings of the utility model should also be included in the protection range of the utility model.

Claims

1. A dual layer battery pack case characterized by, The double-layer battery pack box comprises an upper box body and a lower box body, the lower box body comprises a bottom plate and four surrounding side plates, a top opening surrounded by the four surrounding side plates is fixed with an upper liquid cooling plate through threaded fasteners, the four surrounding edges of the upper liquid cooling plate are provided with fixed edges fixedly connected with the four surrounding side plates of the lower box body, the top surfaces of the four surrounding side plates of the lower box body are support surfaces for supporting the fixed edges and are provided with mounting holes for mounting the threaded fasteners, one of the support surfaces and the fixed edges is provided with a positioning column and the other is provided with a positioning hole into which the positioning column is inserted to position the upper liquid cooling plate when the upper liquid cooling plate is mounted.

2. The dual-layer battery pack enclosure of claim 1, wherein, The positioning column and the positioning hole are both cylindrical and are provided with two respectively, the two positioning columns are provided at diagonal positions of the four surrounding side plates of the lower box body or the four surrounding fixed edges of the upper liquid cooling plate.

3. The dual-layer battery pack enclosure of claim 1 or 2, wherein, The upper liquid cooling plate comprises a liquid cooling plate body and front and rear flow passage blocks fixed at the front and rear ends of the liquid cooling plate body respectively, the left and right side edges of the liquid cooling plate body are integrally provided with fixed edges respectively, and the front and rear flow passage blocks are integrally provided with fixed edges respectively.

4. The dual layer battery pack enclosure of claim 3, wherein, A front panel is fixed on the front flow passage block and a rear panel is fixed on the rear flow passage block, the top surfaces and the left and right side surfaces of the front and rear panels are provided with threaded holes respectively, the upper box body is n-shaped, and the upper box body comprises a top plate and left and right panels connected with the top plate, the top plate, the left panel and the right panel are fixed on the top surfaces and the left and right side surfaces of the front and rear panels through screws respectively, and the front flow passage block is provided with a water inlet nozzle and a water outlet nozzle located at the front side of the front panel.

5. The dual layer battery pack enclosure of claim 4, wherein, The front and rear panels are provided with assembly operation holes respectively, and the double-layer battery pack box further comprises sealing plates fixed on the front and rear panels respectively and covering the corresponding assembly operation holes.

6. The dual-layer battery pack enclosure of claim 1 or 2, wherein, The front side plate and / or the rear side plate of the lower box body are provided with assembly operation holes, and the lower box body further comprises sealing plates fixed on the corresponding side plates to cover the assembly operation holes on the side plates.

7. The dual-layer battery pack enclosure of claim 1 or 2, wherein, The bottom plate of the lower box body is a lower liquid cooling plate, the upper liquid cooling plate and the lower liquid cooling plate both comprise a liquid cooling plate body and front and rear flow passage blocks fixed at the front and rear ends of the liquid cooling plate body respectively, the front flow passage blocks of the upper liquid cooling plate and the lower liquid cooling plate are provided with a water inlet nozzle and a water outlet nozzle respectively, the water inlet nozzle of the upper liquid cooling plate is located directly above the water outlet nozzle of the lower liquid cooling plate, the water outlet nozzle of the upper liquid cooling plate is located directly above the water inlet nozzle of the lower liquid cooling plate, and the water outlet nozzle of the upper liquid cooling plate and the water inlet nozzle of the lower liquid cooling plate are connected through a water pipe or the water outlet nozzle of the lower liquid cooling plate and the water inlet nozzle of the upper liquid cooling plate are connected through a water pipe.

8. The dual layer battery pack enclosure of claim 7, wherein, The front flow passage block of the upper liquid cooling plate is integrally provided with a fixed edge, and the edges of the fixed edge and the support surface below the fixed edge are both provided with avoiding notches for avoiding the water pipe.

9. The dual layer battery pack enclosure of claim 7, wherein, The front flow passage block of the upper liquid cooling plate is integrally provided with a fixed edge, and the edges of the fixed edge and the support surface below the fixed edge are both provided with avoiding grooves for avoiding the cable.

10. A dual-layer battery pack comprising a case and a battery disposed within the case, characterized by, The box is the box according to any one of claims 1-9.

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