CN219163593U - Double-layer battery module and battery pack - Google Patents

Abstract

The utility model provides a double-layer battery module and a battery pack, wherein the double-layer battery module comprises an upper layer module and a lower layer module which are arranged in a vertically stacked mode, module supports are respectively arranged at two ends of the lower layer module in the length direction, and the module supports are used for supporting the end parts of the upper layer module; the double-layer battery module further comprises a middle support arranged in the middle of the lower-layer module, the lower part of the middle support is vertically arranged in the lower-layer module, the lower end face of the middle support is flush with the bottom face of the lower-layer module, and the upper end face of the middle support is used for supporting the bottom face of the upper-layer module.

Description

Double-layer battery module and battery pack

Technical Field

The utility model relates to the technical field of batteries, in particular to a double-layer battery module and a battery pack.

Background

The power battery system is used as an energy storage and power output device of the electric vehicle, is a power source of the electric vehicle, is a guarantee of cruising ability of the electric vehicle, and brings higher demands to the energy density, grouping efficiency and the like of the battery system along with the vigorous development of new energy industries. The battery module of the prior majority of power batteries is a single-layer module, the space utilization rate of the single-layer module structure is low, and the energy density of a battery pack cannot be effectively improved.

At present, power battery systems on the market face the requirements of high energy density and high space utilization, and two single-layer battery modules are gradually stacked up and down in a battery box body, so that the structural scheme of a double-layer battery module is realized, and the space utilization of a battery pack is improved. At present, the mounting mode of the double-layer battery module in the battery box body is to fix the lower-layer battery module on the bottom surface of the lower box body, and the upper-layer battery module is directly mounted on the box wall of the battery box body through a bracket, so that the box wall is a stress component, the strength is insufficient, and the box wall of the box body is deformed due to impact or vibration.

As disclosed in chinese patent publication No. CN207282567U, a dual-layer battery module fixing structure for a power battery is disclosed, which is characterized in that upper layer module supports and lower layer module supports are disposed at two ends of an upper layer battery module and a lower layer battery module, gravity of the upper layer battery module acts on the lower layer module supports through the upper layer module supports, the lower layer battery module is connected into a whole by the lower layer module supports, the upper layer battery module and the lower layer battery module are integrated by the upper layer module supports and the lower layer module supports, after the battery is installed, the two layer module supports are used as gravity carriers, and pressure of the upper layer module to the lower layer module is completely transmitted to the bottom surface of the battery box through the module supports, and the pressure is not directly acted on the lower layer module, so that a protection effect is achieved on the battery module, and meanwhile, the strength of the whole structure of the battery module is improved, and deformation is not caused to the battery box.

However, in the above scheme, the weight of the upper layer battery module is completely borne by the upper layer module supports at two ends of the upper layer battery module, the middle part of the upper layer battery module is not provided with a gravity bearing body, in the use process of the battery pack, particularly when vibration occurs, the electric core in the middle part of the upper layer battery module can fall down, particularly when the battery module is arranged longer, the possibility that the electric core in the middle part of the upper layer battery module falls down is higher, the structural strength and stability of the upper layer battery module are insufficient, the electric connection part at the top of the electric core is easy to break or separate from the electric core, and short circuit fire is caused between the electric cores when serious, so that the double-layer battery module has great potential safety hazard in the use process.

Disclosure of Invention

In view of this, the utility model provides a double-layer battery module and a battery pack, which are used for solving the problems that in the prior art, the weight of an upper layer battery module in the double-layer battery module is completely borne by upper layer module supports at two ends of the upper layer battery module, the middle part of the upper layer battery module is not provided with a gravity bearing body, the middle part of the upper layer battery module is easy to fall down, and the structural strength and stability of the upper layer battery module are insufficient, so that the double-layer battery module has a larger potential safety hazard in the use process.

The technical scheme of the utility model is realized as follows:

in one aspect, the utility model provides a double-layer battery module, which comprises an upper layer module and a lower layer module which are arranged in a vertically stacked manner, wherein module supports are respectively arranged at two ends of the lower layer module in the length direction, and the module supports are used for supporting the end parts of the upper layer module;

the double-layer battery module is characterized by further comprising a middle support arranged in the middle of the lower-layer module, wherein the lower part of the middle support is vertically arranged in the lower-layer module, the lower end face of the middle support is flush with the bottom face of the lower-layer module, and the upper end face of the middle support is used for supporting the bottom face of the upper-layer module.

On the basis of the technical scheme, preferably, the middle support comprises a lower middle end plate and a supporting body, a gap is formed in the middle of the lower module, the lower middle end plate is vertically arranged in the gap, the top surface of the lower middle end plate is lower than the top surface of the lower module, the lower end of the supporting body is inserted in the gap and fixedly connected with the lower middle end plate, and the upper end of the supporting body abuts against the bottom surface of the lower module.

Further, preferably, the middle part of the upper module is provided with an upper middle end plate, the bottom surface of the upper middle end plate is flush with the bottom surface of the upper module, the upper middle end plate and the middle support are provided with first connecting holes in the vertical direction, and the first connecting holes are used for fixedly connecting the upper middle end plate and the middle support with the battery box body through bolts.

Still further, preferably, the middle support is provided with a plurality of second connecting holes in the vertical direction, and the second connecting holes are used for fixedly connecting the middle support with the battery box body through bolts.

On the basis of the technical scheme, preferably, the lower module comprises a lower cell group, lower module end plates positioned at two ends of the lower cell group in the length direction and lower binding bands surrounding the lower cell group and the lower module end plates, and the upper module comprises an upper cell group, upper module end plates positioned at two ends of the upper cell group in the length direction and upper binding bands surrounding the upper cell group and the upper module end plates; the upper end of module support is connected with upper module end plate bottom surface, the lower extreme of module support flushes with the bottom surface of lower floor's module mutually, upper module end plate, module support and lower floor's module end plate have seted up the third connecting hole that the position corresponds in vertical direction, the third connecting hole is used for carrying out fixed connection with upper module end plate, module support and lower floor's module end plate and battery box through the bolt.

Further, preferably, the module support comprises a vertical frame, a support beam and a horizontal beam, wherein the vertical frame is vertically arranged on one side, far away from the lower-layer battery cell group, of the lower-layer module end plate, the support beam is horizontally and fixedly arranged on the top end of the vertical frame and used for supporting the bottom surface of the upper-layer module end plate, the top surface of the horizontal beam is connected with the bottom surface of the vertical frame and the bottom surface of the lower-layer module end plate, the bottom surface of the horizontal beam is flush with the bottom surface of the lower-layer module, and the third connecting hole is formed in the upper-layer module end plate, the support beam, the lower-layer module end plate and the horizontal beam.

Still further, preferably, the vertical frame and the horizontal beam are provided with fourth connecting holes corresponding to each other in position in the vertical direction, and the fourth connecting holes are used for fixedly connecting the vertical frame and the horizontal beam with the battery box body through bolts.

On the basis of the technical scheme, preferably, the double-layer battery module further comprises a liquid cooling assembly, the liquid cooling assembly comprises a liquid cooling plate and a fixing support, the liquid cooling plate is horizontally arranged on the bottom surface of the lower-layer module, the upper end face of the middle support is used for supporting the bottom surface of the liquid cooling plate, two ends of the liquid cooling plate are respectively fixedly connected with the fixing support, the fixing support is located between an upper-layer module end plate and the module support, and a third connecting hole corresponding to the position of the upper-layer module end plate is also formed in the fixing support.

Preferably, a plurality of reinforcing ribs are arranged in the vertical direction at intervals in the vertical frame.

On the other hand, the utility model also discloses a battery pack which is provided with a lower box body, wherein the double-layer battery module is fixedly arranged in the lower box body, and the battery pack further comprises an upper box body fixedly connected with the lower box body.

Compared with the prior art, the utility model has the following beneficial effects:

(1) According to the double-layer battery module disclosed by the utility model, the module supports are respectively arranged at the two ends of the lower-layer module in the length direction, so that the end part of the upper-layer module can be supported, and meanwhile, the upper-layer module, the module supports and the lower-layer module can be fixedly connected with a battery box body in the vertical direction through bolts by virtue of the arrangement of the module supports; through setting up the middle part support at lower floor's module middle part to make the lower part terminal surface of middle part support flush with the bottom surface of lower floor's module, after the lower floor's module is assembled in the battery box, the lower extreme of middle part support is contradicted with the battery box bottom surface, and the upper end of middle part support can support upper module bottom surface, thereby realizes that upper module middle part possesses has the bearing capacity, thereby avoids the upper module to take place the whereabouts condition, improves upper module structural strength and stability;

(2) The middle of the upper module is provided with an upper middle end plate, the upper middle end plate and a middle support are provided with first connecting holes corresponding to each other in the vertical direction, and the first connecting holes are used for fixedly connecting the upper middle end plate, the middle support and the battery box body through bolts, so that the middle support supports the upper module and simultaneously ensures that the middle of the upper module and the middle of the lower module are fixedly connected in the vertical direction;

(3) The middle support is provided with a second connecting hole in the vertical direction, bolts can be inserted through the second connecting hole, so that the middle support and the battery box body are fixedly connected, the assembly structural strength between the lower module and the battery box body is realized, and the assembly structural strength between the upper module, the lower module and the battery box body in the vertical direction is further improved;

(4) The upper end of the module support is connected with the bottom surface of the upper module end plate, so that the end part of the upper module can be supported on one hand, and on the other hand, the supporting force acts on the upper module end plate, so that the direct acting on the battery cells can be avoided, and the safety and reliability of the battery cell group after assembly can be improved;

(5) The vertical connecting holes corresponding to the positions of the vertical frame and the horizontal cross beam are formed in the vertical direction, the vertical frame and the horizontal cross beam are fixedly connected with the battery box body through bolts inserted into the fourth connecting holes, the fastening force between the module support and the battery box body in the vertical direction can be established, and the risk of tipping of an upper module due to insufficient structural strength when the upper module end plate, the module support and the lower module end plate are fixedly connected with the battery box body through long bolts is avoided;

(6) Through set up the liquid cooling board in upper die set bottom surface to through set up the fixed bolster at liquid cooling board length direction both ends, and make upper die set end plate, the fixed bolster, die set support and lower floor's die set end plate establish through the bolt with the battery box be connected, make the middle part support the liquid cooling board simultaneously, this kind of structure sets up, on the one hand, can realize dispelling the heat to upper die set through the liquid cooling board, on the other hand, carry out the spanish through the middle part support to the liquid cooling board middle part, can avoid the liquid cooling board middle part to weigh down, and then realize the even support of liquid cooling board to the lower floor's die set, guarantee the structural strength of upper die set.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic perspective view of a double-layered battery module according to the present disclosure;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic diagram of an assembly structure of a lower module and a middle bracket according to the present disclosure;

FIG. 4 is a schematic perspective view of a carrier according to the present disclosure;

FIG. 5 is a schematic perspective view of an upper module according to the present disclosure;

FIG. 6 is a schematic perspective view of a module bracket according to the present disclosure;

FIG. 7 is an enlarged view of a portion of FIG. 1 at B;

FIG. 8 is a schematic diagram of an assembly structure of a lower case and a lower module according to the present disclosure;

fig. 9 is a schematic perspective view of a battery pack according to the present disclosure;

reference numerals:

1. an upper layer module; 2. a lower layer module; 3. a module support; 4. a middle bracket; 41. a lower middle end plate; 42. a carrier; 5. an upper middle end plate; s1, a first connecting hole; s2, a second connecting hole; 21. a lower layer cell group; 22. a lower module end plate; 23. a lower layer binding band; 11. an upper layer cell group; 12. an upper module end plate; 13. an upper layer binding band; s3, a third connecting hole; 31. a vertical frame; 32. a support beam; 33. a horizontal cross beam; s4, a fourth connecting hole; 6. a liquid cooling assembly; 61. a liquid cooling plate; 62. a fixed bracket; 311. reinforcing ribs; 7. a lower box body; 8. and an upper box body.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1, in combination with fig. 2, 3 and 5, an embodiment of the present utility model discloses a double-layered battery module including an upper module 1 and a lower module 2 stacked up and down.

As a conventional matter, the lower module 2 includes a lower cell set 21, lower module end plates 22 located at two ends of the lower cell set 21 in the length direction, and lower straps 23 surrounding the lower cell set 21 and the outer sides of the lower module end plates 22, where the lower cell set 21 is formed by arranging a plurality of unit cells, and specifically, the thickness direction surfaces of the unit cells are connected to each other. The plurality of single battery cells in the lower battery cell group 21 can be compactly distributed in the horizontal direction through the lower module end plate 22, and the lower module 2 can be grouped by binding the outer sides of the lower battery cell group 21 and the lower module end plate 22 through the lower binding belt 23.

Similarly, the upper module 1 includes an upper cell group 11, upper module end plates 12 located at two ends of the upper cell group 11 in the length direction, and upper straps 13 surrounding the outer sides of the upper cell group 11 and the upper module end plates 12. The upper layer cell group 11 is formed by arranging a plurality of single cells, and specifically, the thickness direction surfaces of the single cells are connected with each other. The plurality of single battery cells in the upper battery cell group 11 can be compactly distributed in the horizontal direction through the upper module end plate 12, and the upper battery cell group 11 and the outer side of the upper module end plate 12 can be bound by utilizing the upper binding belt 13, so that the upper module 1 is grouped.

When the upper module 1 is stacked above the lower module 2, it cannot be directly pressed on the surface of the lower module 2, because the top surface of the upper module 1 has electrical connection components, such as a bus bar, a wire harness isolation board, a circuit board, etc., if the upper module 1 is directly placed on the top surface of the lower module 2, this may cause the upper module 1 to crush the electrical connection components on the top surface of the lower module 2 or crush the individual cells on the lower module 2. For this reason, be provided with module support 3 respectively through in lower floor's module 2 length direction both ends among the prior art, can support upper module 1 both ends through module support 3 to possess certain interval between messenger's lower floor's module 2 and the upper module 1, avoid upper module 1's weight to directly act on lower floor's module 2.

In the prior art, the weight of the upper module 1 is completely borne by the module supports 3 at two ends of the lower module 2, the middle part of the upper module 1 is not provided with the gravity bearing body 42, in the use process of the battery pack, particularly when vibration occurs, the single battery core in the middle part of the upper module 1 can fall down, particularly when the module arrangement is longer, the possibility that the single battery core in the middle part of the upper module 1 falls down is higher, the structural strength and stability of the upper module 1 are insufficient, the electric connection part at the top of the single battery core is easy to break or separate from the single battery core, and short circuit fire starting occurs between the single battery cores when serious, so that the double-layer battery module has great potential safety hazard in the use process.

For this reason, in order to solve the above-mentioned problem, the present embodiment further provides a middle support 4 in the double-layer battery module, the lower portion of the middle support 4 is vertically disposed in the lower-layer module 2, and the lower end surface of the middle support 4 is flush with the bottom surface of the lower-layer module 2, and the upper end surface of the middle support 4 is used for supporting the bottom surface of the upper-layer module 1.

The upper layer module 1 can be supported by arranging the module supports 3 at the two ends of the lower layer module 2 in the length direction, and the upper layer module 1, the module supports 3 and the lower layer module 2 can be fixedly connected with the battery box body in the vertical direction through bolts by arranging the module supports 3; through set up middle part support 4 in the middle part of lower floor's module 2 to make the lower part terminal surface of middle part support 4 flush with the bottom surface of lower floor's module 2, after the lower floor's module 2 is assembled in the battery box, the lower extreme of middle part support 4 is contradicted with the battery box bottom surface, and the upper end of middle part support 4 can support upper die set 1 bottom surface, thereby realizes that upper die set 1 middle part possesses has the holding power, thereby avoids upper die set 1 to appear the condition of falling, improves upper die set 1 structural strength and stability.

As some preferred embodiments, referring to fig. 3, the middle support 4 includes a lower middle end plate 41 and a carrier 42, a gap is provided in the middle of the lower module 2, the lower middle end plate 41 is vertically disposed in the gap, the bottom surface of the lower middle end plate 41 is flush with the bottom surface of the lower module 2, and the top surface of the lower middle end plate 41 is lower than the top surface of the lower module 2, so that when the lower module 2 is assembled, the lower middle end plate 41 is assembled in the middle of the lower module 2, so that the lower middle end plate 41 and the lower module 2 form a complete whole, and in this way, a carrier is not connected with the lower middle end plate 41 in advance, so that the lower module 2 is convenient for installing an electrical connection component, and when the upper module 1 is connected, the carrier 42 is inserted into the gap and connected with the top end of the lower middle end plate 41, thereby realizing that the carrier 42 supports the upper module 1.

Referring to fig. 3 and 4, in order to realize that when the middle support 4 supports the upper module 1, the middle of the upper module 1 and the middle of the lower module 2 are connected, in this embodiment, an upper middle end plate 5 is disposed in the middle of the upper module 1, the bottom surface of the upper middle end plate 5 is flush with the bottom surface of the upper module 1, the upper middle end plate 5 and the middle support 4 are provided with first connecting holes S1 corresponding to positions in the vertical direction, and the first connecting holes S1 are used for fixedly connecting the upper middle end plate 5 and the middle support 4 with the battery box through bolts. From this setting, guarantee upper module 1 and lower module 2 middle part in vertical direction fastening connection when can realizing that middle part support 4 supports upper module 1.

Because upper module 1 and lower floor ' S module 2 place from top to bottom in the vertical direction, and whole double-deck battery module ' S height is higher, and first connecting hole S1 need carry out fixed connection with upper middle part end plate 5 and middle part support 4 and battery box through the long bolt, this can lead to the whole that forms after upper module 1 and lower floor ' S module 2 are connected to take place the swing at vibrations in-process, has the risk of tipping. For this reason, the second connecting hole S2 is formed in the vertical direction through the middle bracket 4, and the bolt can be inserted through the second connecting hole S2, so that the middle bracket 4 and the battery box body are fastened and connected in advance, the assembly structural strength between the lower module 2 and the battery box body is achieved, the assembly structural strength between the upper module 1, the lower module 2 and the battery box body in the vertical direction is improved, and the double-layer battery module is prevented from tipping.

As some preferred embodiments, referring to fig. 6 and 7, the upper end of the module support 3 is connected to the bottom surface of the upper module end plate 12, the lower end of the module support 3 is flush with the bottom surface of the lower module 2, and the upper module end plate 12, the module support 3 and the lower module end plate 22 are provided with third connecting holes S3 corresponding to each other in position in the vertical direction, and the third connecting holes S3 are used for fixedly connecting the upper module end plate 12, the module support 3 and the lower module end plate 22 with the battery box body through bolts. From this setting, after lower floor's module 2 is installed on the battery box and is accomplished, set up module support 3 respectively at lower floor's module 2 length direction both ends, place two module support 3 top surfaces with upper module 1 again, be connected with upper module end plate 12 bottom surface through the upper end of module support 3, on the one hand can carry out the bearing to upper module 1 tip, on the other hand, the bearing force is on upper module end plate 12, can avoid directly acting on the electric core, improve electric core group's after-assembly security and reliability. The upper module end plate 12, the module support 3, the lower module 2 and the battery box are fixedly connected in the vertical direction through long screws, and the battery box is simple in installation structure and convenient to detach.

The embodiment shows a preferred embodiment of the module support 3, specifically, referring to fig. 7 and 8, the module support 3 includes a stand 31, a support beam 32 and a horizontal beam 33, the stand 31 is vertically disposed on one side of the lower module end plate 22 far away from the lower cell group 21, the support beam 32 is horizontally and fixedly disposed on the top end of the stand 31, for supporting the bottom surface of the upper module end plate 12, the top surface of the horizontal beam 33 is connected with the bottom surface of the stand 31 and the bottom surface of the lower module end plate 22, the bottom surface of the horizontal beam 33 is flush with the bottom surface of the lower module 2, and the third connecting hole S3 is located on the upper module end plate 12, the support beam 32, the lower module end plate 22 and the horizontal beam 33. Through the above structure setting, when lower floor's module 2 is installed on the battery box, at first with horizontal crossbeam 33 level setting in the battery box bottom surface, then after installing lower floor's module 2, guarantee that horizontal crossbeam 33 is located the bottom surface of lower floor's module end plate 22, make horizontal crossbeam 33 joint between lower floor's module end plate 22 and the battery box, thereby rationally utilize the narrow and small space of battery box, then place the vertical roof 31 on horizontal crossbeam 33, last place upper module 1 again, make upper module end plate 12 just be located the supporting beam 32 top, provide ascending holding power through roof beam 31, and act on upper module end plate 12 through supporting beam 32, make the weight of upper module 1 pass through supporting beam 32, the roof beam 31, horizontal crossbeam 33 is on transferring the battery box, can not act on lower floor's module 2, play the protection to lower floor's module 2, in order to improve the structural strength of roof beam 31, be provided with many strengthening ribs 311 in vertical direction interval in the roof beam 31, pass upper module 12 in proper order through the long screw rod, supporting beam 32, lower floor's module 22 and horizontal crossbeam 33 are fastened and are connected.

Because four long screw rods of the corners are used for fastening connection among the upper module end plate 12, the module support 3 and the lower module 2 and the battery box body, the long screw rods can not effectively restrain swinging of the double-layer battery module when being vibrated, and the double-layer battery module can be tilted relative to the battery box body, so that insufficient connection strength between the double-layer battery module and the battery box body can be caused. For this reason, in this embodiment, the fourth connecting hole S4 corresponding to the position is formed in the vertical direction through the vertical frame 31 and the horizontal beam 33, the vertical frame 31 and the horizontal beam 33 are fixedly connected with the battery box body by inserting the bolt into the fourth connecting hole S4, the fastening force between the module support 3 and the battery box body in the vertical direction can be established, and the risk of the upper module 1 tipping due to insufficient structural strength is avoided when the upper module end plate 12, the module support 3 and the lower module end plate 22 are fixedly connected with the battery box body by long bolts.

In order to realize radiating upper module 1, the double-deck battery module of this embodiment still includes liquid cooling subassembly 6, and liquid cooling subassembly 6 includes liquid cooling board 61 and fixed bolster 62, and liquid cooling board 61 level sets up in lower floor 'S module 2 bottom surface, and the upper portion terminal surface of middle part support 4 is used for supporting liquid cooling board 61 bottom surface, liquid cooling board 61' S both ends respectively with fixed bolster 62 fixed connection, fixed bolster 62 are located between upper module end plate 12 and the module support 3, and also are provided with the third connecting hole S3 that corresponds with upper module end plate 12 position on the fixed bolster 62. From this setting, on the one hand can realize dispelling the heat to upper module 1 through liquid cooling plate 61, on the other hand, holds liquid cooling plate 61 middle part through middle part support 4, can avoid liquid cooling plate 61 middle part whereabouts, and then realizes liquid cooling plate 61 to the even support of lower floor's module 2, guarantees upper module 1's structural strength.

The embodiment also discloses a battery pack, which is shown by referring to fig. 9, and has a lower case 7, wherein the lower case 7 is internally and fixedly provided with the double-layer battery module, and further comprises an upper case 8 fixedly connected with the lower case 7. The double-layer battery module has stronger structural strength, so that the overall structural strength of the battery pack is improved, and the use safety of the battery pack is further improved.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims (10)

1. The double-layer battery module comprises an upper layer module (1) and a lower layer module (2) which are arranged in a vertically stacked mode, module supports (3) are respectively arranged at two ends of the lower layer module (2) in the length direction, and the module supports (3) are used for supporting the end parts of the upper layer module (1);

the method is characterized in that: the double-layer battery module is characterized by further comprising a middle support (4) arranged in the middle of the lower-layer module (2), wherein the lower part of the middle support (4) is vertically arranged in the lower-layer module (2), the lower end face of the middle support (4) is flush with the bottom face of the lower-layer module (2), and the upper end face of the middle support (4) is used for supporting the bottom face of the upper-layer module (1).

2. The double-layer battery module according to claim 1, wherein: the middle support (4) comprises a lower middle end plate (41) and a supporting body (42), a gap is formed in the middle of the lower middle module (2), the lower middle end plate (41) is vertically arranged in the gap, the top surface of the lower middle end plate (41) is lower than the top surface of the lower module (2), the lower end of the supporting body (42) is inserted in the gap and fixedly connected with the lower middle end plate (41), and the upper end of the supporting body (42) abuts against the bottom surface of the lower module (2).

3. The double-layer battery module according to claim 2, wherein: the upper module (1) middle part is provided with upper middle part end plate (5), the bottom surface of upper middle part end plate (5) flushes with upper module (1) bottom surface, upper middle part end plate (5) and middle part support (4) have seted up first connecting hole (S1) that the position corresponds in vertical direction, first connecting hole (S1) are used for carrying out fixed connection upper middle part end plate (5) and middle part support (4) with the battery box through the bolt.

4. The double-layer battery module according to claim 3, wherein: the middle support (4) is provided with a plurality of second connecting holes (S2) in the vertical direction, and the second connecting holes (S2) are used for fixedly connecting the middle support (4) with the battery box body through bolts.

5. The double-layer battery module according to claim 1, wherein: the lower module (2) comprises a lower cell group (21) and lower module end plates (22) positioned at two ends of the lower cell group (21) in the length direction; the upper module (1) comprises an upper cell group (11), upper module (1) end plates positioned at two ends of the upper cell group (11) in the length direction and upper binding bands (13) surrounding the outer sides of the upper cell group (11) and the upper module end plates (12); the upper end of module support (3) is connected with upper module end plate (12) bottom surface, the lower extreme of module support (3) flushes with the bottom surface of lower floor ' S module (2), upper module end plate (12), module support (3) and lower floor ' S module end plate (22) have seted up third connecting hole (S3) that the position corresponds in vertical direction, third connecting hole (S3) are used for carrying out fixed connection with upper module end plate (12), module support (3) and lower floor ' S module end plate (22) and battery box through the bolt.

6. The double-layer battery module according to claim 5, wherein: the module support (3) comprises a vertical frame (31), a supporting beam (32) and a horizontal cross beam (33), wherein the vertical frame (31) is arranged on one side, far away from a lower-layer battery cell group (21), of a lower-layer module end plate (22), the supporting beam (32) is horizontally and fixedly arranged at the top end of the vertical frame (31) and used for supporting the bottom surface of an upper-layer module end plate (12), the top surface of the horizontal cross beam (33) is connected with the bottom surface of the vertical frame (31) and the bottom surface of the lower-layer module end plate (22), the bottom surface of the horizontal cross beam (33) is flush with the bottom surface of a lower-layer module (2), and a third connecting hole (S3) is formed in the upper-layer module end plate (12), the supporting beam (32), the lower-layer module end plate (22) and the horizontal cross beam (33).

7. The double-layer battery module according to claim 6, wherein: the vertical frame (31) and the horizontal cross beam (33) are provided with fourth connecting holes (S4) corresponding to each other in the vertical direction, and the fourth connecting holes (S4) are used for fixedly connecting the vertical frame (31) and the horizontal cross beam (33) with the battery box body through bolts.

8. The double-layer battery module according to claim 5, wherein: the double-layer battery module further comprises a liquid cooling assembly (6), the liquid cooling assembly (6) comprises a liquid cooling plate (61) and a fixing support (62), the liquid cooling plate (61) is horizontally arranged on the bottom surface of the lower-layer module (2), the upper end surface of the middle support (4) is used for supporting the bottom surface of the liquid cooling plate (61), two ends of the liquid cooling plate (61) are respectively fixedly connected with the fixing support (62), the fixing support (62) is located between an upper-layer module end plate (12) and a module support (3), and a third connecting hole (S3) corresponding to the position of the upper-layer module end plate (12) is also formed in the fixing support (62).

9. The double-layer battery module according to claim 6, wherein: a plurality of reinforcing ribs (311) are arranged in the vertical direction at intervals in the vertical frame (31).

10. A battery pack having a lower case (7), characterized in that: the double-layer battery module according to any one of claims 1 to 9 is fixedly arranged in the lower box body (7), and the double-layer battery module further comprises an upper box body (8) fixedly connected with the lower box body (7).

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