CN220253325U - Liquid cooling electric box and integrated battery package - Google Patents

Abstract

The utility model belongs to the technical field of batteries, and discloses a liquid cooling electric box and an integrated battery pack. The liquid cooling electric box comprises a box body, a box cover and a liquid cooling bottom plate, wherein the box body comprises an upper mounting frame arranged at the top, a lower mounting frame arranged at the bottom and a plurality of surrounding plates arranged on the periphery, two ends of the surrounding plates are respectively connected with the upper mounting frame and the lower mounting frame, the box cover is connected with the upper mounting frame, the lower mounting frame is provided with a central hole, the liquid cooling bottom plate is accommodated in the central hole, the bottom surface of the liquid cooling bottom plate is overlapped with the bottom surface of the lower mounting frame, and the liquid cooling bottom plate is used for cooling a double-row module accommodated in the liquid cooling electric box. The liquid cooling bottom plate holds in the centre bore of installing the frame down for the bottom surface of liquid cooling bottom plate and the bottom plate coincidence of installing the frame down, make the high of liquid cooling bottom plate have the coincidence portion with the high of installing the frame down, reduced the occupation space of battery package, promote space utilization, and then promote the volume energy density of battery package.

Description

Liquid cooling electric box and integrated battery package

Technical Field

The utility model relates to the technical field of batteries, in particular to a liquid cooling electric box and an integrated battery pack.

Background

The battery core can generate heat in the charge and discharge process, and the larger the charge and discharge power is, the more heat is generated, so that the heat dissipation design is considered when the design of the module and the battery pack is carried out, and the high-rate charge and discharge requirements are met.

At present, the mainstream battery heat dissipation design in the energy storage market is battery bottom liquid cooling heat dissipation and air cooling heat dissipation, and the circulation of the cooling medium in the liquid cooling bottom plate is used for taking away the heat of electric core, but the volume increase of battery package can generally be made in the setting of bottom plate liquid cooling bottom plate, leads to the volume energy density reduction of battery package, influences the space utilization of vehicle.

Therefore, there is a need for a liquid-cooled electric box and an integrated battery pack to solve the above problems.

Disclosure of Invention

The utility model aims to provide a liquid cooling electric box and an integrated battery pack, which not only can ensure strength, but also can save height space, improve the volume energy density of the battery pack and further improve the space utilization rate.

To achieve the purpose, the utility model adopts the following technical scheme:

the liquid cooling electric box, the liquid cooling electric box includes box, case lid and liquid cooling bottom plate, the box is including setting up in the last installing frame at top, setting up in the lower installing frame of bottom and setting up in a plurality of bounding walls on every side, the both ends of bounding wall connect respectively in go up the installing frame with install the frame down, the case lid connect in go up the installing frame, the installing frame has the centre bore down, the liquid cooling bottom plate hold in the centre bore, make the bottom surface of liquid cooling bottom plate with the bottom surface coincidence of installing the frame down, the liquid cooling bottom plate be used for the cooling hold in double module in the liquid cooling electric box.

As an optional technical scheme, at least two opposite sides of the central hole are provided with first steps, at least two opposite sides of the liquid cooling bottom plate are provided with second steps, at least two of the second steps are opposite to at least two of the first steps, and the second steps are abutted to the first steps.

As an optional technical scheme, the first step and the second step, the inner wall of the central hole and the raised outer wall of the liquid cooling bottom plate are bonded through structural adhesive.

As an optional technical scheme, the liquid cooling electric box further comprises a bottom sealing plate, and the bottom sealing plate is arranged at the butt joint position of the bottom of the liquid cooling bottom plate and the bottom of the lower mounting frame.

As an optional technical scheme, the liquid cooling bottom plate includes a plurality of first runners that are on a parallel with first direction, and a plurality of first runners are along the interval setting of second direction, the liquid cooling bottom plate is provided with first water inlet and first delivery port, first water inlet with first delivery port is followed first direction set up in the both ends of liquid cooling bottom plate, and a plurality of the one end of first runner all with first water inlet intercommunication, a plurality of the other end of first runner all with first delivery port intercommunication, coolant respectively gets into a plurality of behind the first water inlet a plurality of first runners, rethread first delivery port flows.

As an optional technical solution, the cross section of the first flow channel is triangular, trapezoidal or rectangular.

As an optional technical scheme, the liquid cooling electric box further comprises a vertical liquid cooling plate, wherein the vertical liquid cooling plate is perpendicular to the liquid cooling bottom plate, and the vertical liquid cooling plate is arranged between two electric core groups of the double-row module and used for cooling the electric core groups on the side face.

As an optional technical scheme, perpendicular liquid cooling board includes a plurality of second runners that are on a parallel with first direction, and a plurality of the second runner is along the third direction interval setting, perpendicular liquid cooling board is provided with second water inlet and second delivery port, the second water inlet with the second delivery port set up respectively on perpendicular to two opposite sides of second runner, a plurality of the one end of second runner all with the second water inlet intercommunication, a plurality of the other end of second runner all with the second delivery port intercommunication, the coolant medium passes through behind the second water inlet respectively get into a plurality of second runners, rethread the second delivery port flows.

As an optional technical scheme, the second water inlet is arranged close to the liquid cooling bottom plate, and the second water outlet is arranged close to the box cover.

The utility model adopts the following technical scheme:

the integrated battery pack comprises at least two single-layer battery packs, at least two single-layer battery packs are stacked, each single-layer battery pack comprises the liquid cooling electric box, and a plurality of double-row modules are contained in the liquid cooling electric box.

The utility model has the beneficial effects that:

the utility model discloses a liquid cooling electric box which comprises a box body, a box cover and a liquid cooling bottom plate, wherein the box body comprises an upper mounting frame arranged at the top, a lower mounting frame arranged at the bottom and a plurality of coamings arranged on the periphery, two ends of each coaming are respectively connected with the upper mounting frame and the lower mounting frame, the box cover is connected with the upper mounting frame, the lower mounting frame is provided with a central hole, the liquid cooling bottom plate is accommodated in the central hole, the bottom surface of the liquid cooling bottom plate is overlapped with the bottom surface of the lower mounting frame, and the liquid cooling bottom plate is used for cooling double-row modules accommodated in the liquid cooling electric box. The liquid cooling bottom plate holds in the centre bore of installing the frame down for the bottom surface of liquid cooling bottom plate and the bottom plate coincidence of installing the frame down, make the high of liquid cooling bottom plate have the coincidence portion with the high of installing the frame down, reduced the occupation space of battery package, promote space utilization, and then promote the volume energy density of battery package.

The utility model discloses an integrated battery pack, which comprises at least two single-layer battery packs, wherein the two single-layer battery packs are stacked, the single-layer battery packs comprise a liquid cooling electric box as described above, and a plurality of double-row modules are accommodated in the liquid cooling electric box to form the single-layer battery pack. This arrangement allows for an improved volumetric energy density of the integrated battery package and improved space utilization.

Drawings

FIG. 1 is a schematic diagram of a liquid cooling electric box according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of A-A of FIG. 1;

FIG. 3 is an enlarged view of a portion of C in FIG. 2;

FIG. 4 is a cross-sectional view of B-B of FIG. 1;

FIG. 5 is an enlarged view of part of D in FIG. 4;

FIG. 6 is a schematic diagram illustrating the connection of a dual-row module to a vertical liquid cooling plate according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a vertical liquid cooling plate according to an embodiment of the present utility model;

FIG. 8 is a schematic diagram of the connection of a dual-row module to a liquid-cooled backplane, a vertical liquid-cooled panel according to an embodiment of the present utility model;

FIG. 9 is a process diagram of a liquid cooled backplane according to an embodiment of the utility model;

FIG. 10 is a process diagram of a vertical liquid cooling plate according to an embodiment of the present utility model;

fig. 11 is a schematic structural view of an integrated battery pack according to an embodiment of the present utility model.

In the figure:

1. an integrated battery pack; 101. a single layer battery pack;

10. a liquid cooling electric box; 111. an upper mounting frame; 112. a lower mounting frame; 1121. a first step; 1122. a shock pad assembly; 113. coaming plate; 12. a case cover; 121. a process hole; 122. a seal plate assembly; 123. reinforcing ribs; 1231. lifting holes; 13. a liquid-cooled bottom plate; 131. a second step; 132. a first flow passage; 1321. a first water inlet channel; 133. a first water inlet; 134. a first water outlet; 14. a bottom sealing plate; 15. a vertical liquid cooling plate; 151. a second flow passage; 152. a second water inlet; 1521. a second water inlet channel; 153. a second water outlet;

20. a double-row module; 21. a cell group; 22. a side steel plate; 23. an end plate; 24. a steel strip.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

As shown in fig. 1 to 5, in this embodiment, there is provided a liquid-cooled electric box 10, the liquid-cooled electric box 10 includes a box body, a box cover 12 and a liquid-cooled bottom plate 13, the box body includes an upper mounting frame 111 arranged at the top, a lower mounting frame 112 arranged at the bottom and a plurality of surrounding plates 113 arranged around, two ends of the surrounding plates 113 are respectively connected to the upper mounting frame 111 and the lower mounting frame 112, the box cover 12 is connected to the upper mounting frame 111, the lower mounting frame 112 has a central hole, the liquid-cooled bottom plate 13 is accommodated in the central hole, so that the bottom surface of the liquid-cooled bottom plate 13 coincides with the bottom surface of the lower mounting frame 112, and the liquid-cooled bottom plate 13 is used for cooling a double-row module 20 accommodated in the liquid-cooled electric box 10. Specifically, in this embodiment, the liquid cooling bottom plate 13 is accommodated in the central hole of the lower mounting frame 112, so that the bottom surface of the liquid cooling bottom plate 13 coincides with the bottom plate of the lower mounting frame 112, so that the height of the liquid cooling bottom plate 13 and the height of the lower mounting frame 112 have an overlapping portion, and unnecessary increase in the height direction generated by simply overlapping the liquid cooling bottom plate 13 and the lower mounting frame 112 can be avoided, so that the volume energy density of the battery pack is reduced, the occupied space of the battery pack is reduced, and the space utilization is improved. Alternatively, in the present embodiment, the upper mounting frame 111, the lower mounting frame 112, and the plurality of coamings 113 provided around are integrally formed by casting or welding.

Further, at least two opposite sides of the central hole are provided with first steps 1121, at least two opposite sides of the liquid cooling bottom plate 13 are provided with second steps 131, at least two second steps 131 are opposite to at least two first steps 1121, and the second steps 131 are abutted against the first steps 1121. Specifically, in this embodiment, the first steps 1121 are disposed on two opposite sides of the central hole, the second steps 131 are disposed on two sides of the liquid cooling bottom plate 13 corresponding to the central hole, the first steps 1121 can be abutted against the second steps 131, the whole liquid cooling bottom plate 13 can be supported by this structure, the strength of the liquid cooling bottom plate 13 is ensured, the protruding portion of the liquid cooling bottom plate 13 can be located in the central hole, the space waste in the height direction is avoided, the volume of the whole liquid cooling electric box 10 is reduced, and the volume energy density of the battery pack is ensured. Optionally, in other embodiments, the sides around the central hole are all provided with the first steps 1121, and correspondingly, the outer circumferences of the liquid cooling bottom plates 13 are all provided with the second steps 131, so that the supporting force of the lower mounting frame 112 on the liquid cooling bottom plates 13 can be improved, and the service life is ensured.

Optionally, in this embodiment, the liquid cooling bottom plate 13 is formed by processing and welding reinforced aluminum profiles, and has the advantages of good heat conducting performance, high strength, flexible customization of length and low cost.

Further, the first step 1121 and the second step 131, and the inner wall of the central hole and the raised outer wall of the liquid cooling bottom plate 13 are adhered by structural adhesive. Specifically, in this embodiment, the gap between the first step 1121 and the second step 131 is bonded with the gap between the inner wall of the central hole and the convex outer wall of the liquid cooling bottom plate 13 through the structural adhesive, so that the connection integrity of the lower mounting frame 112 and the liquid cooling bottom plate 13 can be ensured, the tightness of the liquid cooling electric box 10 can be ensured, the damage to the inside double-row module 20 caused by external impurities and the like is avoided, and the service life is prolonged.

Further, as shown in fig. 4 to 5, the liquid-cooled electric box 10 further includes a bottom sealing plate 14, and the bottom sealing plate 14 is disposed at a junction between the bottom of the liquid-cooled bottom plate 13 and the bottom of the lower mounting frame 112. Specifically, in the present embodiment, since two opposite sides of the center hole are provided with the first steps 1121, and accordingly, two corresponding side plates of the liquid-cooled bottom plate 13 are provided with the second steps 131 for corresponding to the two first steps 1121, the side of the center hole not provided with the first steps 1121 and the side plate of the liquid-cooled bottom plate 13 not provided with the second steps 131 are simply correspondingly inserted into each other, and in order to improve stability, a bottom sealing plate 14 is provided at the side of the center hole not provided with the first steps 1121 and the side plate of the liquid-cooled bottom plate 13 not provided with the second steps 131 for connecting the lower mounting frame 112 with the liquid-cooled bottom plate 13, ensuring connection strength. Preferably, in this embodiment, structural adhesive is also used between the side edge of the central hole, which is not provided with the first step 1121, and the side plate of the liquid cooling bottom plate 13, which is not provided with the second step 131, so as to ensure the integrity and the tightness.

Further, as shown in fig. 9, the liquid cooling bottom plate 13 includes a plurality of first flow channels 132 parallel to the first direction, and the plurality of first flow channels 132 are arranged at intervals along the second direction, the liquid cooling bottom plate 13 is provided with a first water inlet 133 and a first water outlet 134, the first water inlet 133 and the first water outlet 134 are arranged at two ends of the liquid cooling bottom plate 13 along the first direction, one end of each of the plurality of first flow channels 132 is communicated with the first water inlet 133, the other end of each of the plurality of first flow channels 132 is communicated with the first water outlet 134, and cooling medium respectively enters the plurality of first flow channels 132 after passing through the first water inlet 133 and flows out through the first water outlet 134. Specifically, in this embodiment, two adjacent first flow channels 132 are connected by the reinforcing ribs 123, so that the liquid cooling bottom plate 13 has better strength, which is beneficial to ensuring the strength of the liquid cooling electric box 10. The first water inlet 133 is disposed near one side of the liquid cooling bottom plate 13, and the first water outlet 134 is disposed near one side far from the first water inlet 133, and this arrangement can make the first flow passage 132 as long as possible, ensuring the cooling effect. Preferably, in the present embodiment, the liquid cooling bottom plate 13 is provided with a first water inlet channel 1321 and a first water outlet channel, the first water inlet channel 1321 is parallel to the first water outlet channel and is perpendicular to the first flow channel 132, so that two ends of all the first flow channels 132 are respectively communicated with the first water inlet channel 1321 and the first water outlet channel, and circulation efficiency of the cooling medium is improved. The first water inlet 133 and the first water outlet 134 in this embodiment are disposed on the end surface of the liquid cooling bottom plate 13, which can save space and reduce the volume of the battery pack.

Further, the first flow channel 132 has a triangular, trapezoidal or rectangular cross section. Specifically, in this embodiment, the cross section of the first flow channel 132 is triangular, the cross sections of two adjacent first flow channels 132 are arranged in a crossing manner, and the bottom edge of the triangle is parallel to the end surface of the liquid cooling bottom plate 13, so that the contact area between the cooling medium and the end surface of the liquid cooling bottom plate 13 can be increased, the cooling effect is ensured, the reinforcing ribs 123 are angled, and the strength of the liquid cooling bottom plate 13 can also be increased.

Alternatively, in this embodiment, the liquid-cooled bottom plate 13 may be formed by processing an aluminum profile having a flow passage. Specifically, the aluminum profile is cut according to the required length, then the runner of the end face is machined, so that a water inlet channel or a water outlet channel perpendicular to the runner is formed, and then the end face of the aluminum profile is welded with a sealing plate, so that the processing of the liquid cooling bottom plate 13 is completed.

Alternatively, in other embodiments, the cross section of the first flow channel 132 may have other shapes, which may be specifically configured according to specific use, and may be trapezoidal or rectangular, which is not described herein.

Further, as shown in fig. 6 to 8, the liquid cooling electric box 10 further includes a vertical liquid cooling plate 15, the vertical liquid cooling plate 15 is disposed perpendicular to the liquid cooling bottom plate 13, and the vertical liquid cooling plate 15 is disposed between two electric core groups 21 of the double-row module 20, for cooling the electric core groups 21 laterally. Specifically, in this embodiment, the first direction is perpendicular to the second direction, the perpendicular liquid cooling plate 15 is disposed between two electric core groups 21 of the double-row module 20, and can cool the two electric core groups 21 from two sides, and the liquid cooling bottom plate 13 can cool the bottoms of the electric core groups 21 synchronously, so that three-side liquid cooling of the double-row module 20 is realized, the cooling effect is greatly improved, the structure is simplified, the cost and the space occupation are reduced, and the volume energy density of the battery pack is improved.

Optionally, in this embodiment, the vertical liquid cooling plate 15 is formed by welding reinforced aluminum profiles, and has the advantages of good heat conduction performance, high strength, flexible customization of length and low cost, and can further improve the stability of the battery pack.

Specifically, in this embodiment, the outside of double-row module 20 still is provided with two side steel plates 22 and two end plates 23, two side steel plates 22 set up in the both sides of double-row module 20 along the second direction symmetry, two end plates 23 set up in the both sides of double-row module 20 along first direction symmetry, the periphery of double-row module 20 is located to the steel band 24 cover, and two side steel plates 22 and two end plates 23 all are located the inside of steel band 24, this kind of setting can ensure that double-row module 20 has better intensity, can be applicable to great vibration, great use scene of striking, promote the nimble application nature of battery package.

Further, as shown in fig. 10, the vertical liquid cooling plate 15 includes a plurality of second flow channels 151 parallel to the first direction, and the plurality of second flow channels 151 are arranged at intervals along the third direction, the vertical liquid cooling plate 15 is provided with a second water inlet 152 and a second water outlet 153, the second water inlet 152 and the second water outlet 153 are respectively arranged on two opposite sides perpendicular to the second flow channels 151, one ends of the plurality of second flow channels 151 are communicated with the second water inlet 152, the other ends of the plurality of second flow channels 151 are communicated with the second water outlet 153, and cooling medium enters the plurality of second flow channels 151 after passing through the second water inlet 152 and flows out through the second water outlet 153. Specifically, in the present embodiment, the first direction, the second direction and the third direction are perpendicular to each other, and since the end surface of the vertical liquid cooling plate 15 is used to contact with and cool the battery cell group 21, the second water inlet 152 and the second water outlet 153 of the vertical liquid cooling plate 15 are disposed on two opposite sides of the vertical liquid cooling plate 15, so that the second flow channel 151 can be as long as possible, and the cooling effect is improved. The specific structure of the second flow channel 151 is the same as that of the first flow channel 132, and will not be described here again.

Alternatively, the second flow channel 151 may have a triangular, trapezoidal or rectangular cross section. Specifically, in this embodiment, the cross section of the second flow channel 151 is triangular, the cross sections of two adjacent second flow channels 151 are arranged in a crossing manner, and the bottom edge of the triangle is parallel to the end surface of the vertical liquid cooling plate 15, so that the contact area between the cooling medium and the vertical liquid cooling plate 15 can be increased, the cooling effect is ensured, the reinforcing ribs 123 are arranged at an angle, and the strength of the liquid cooling bottom plate 13 can also be increased.

Alternatively, in other embodiments, the cross section of the second flow channel 151 may have other shapes, which may be specifically configured according to specific use, and may be trapezoidal or rectangular, which is not described herein.

Optionally, in this embodiment, the processing manner of the vertical liquid cooling plate 15 is the same as that of the liquid cooling bottom plate 13, and also can be processed by using an aluminum profile, which is not described herein, and is different in that the sealing plate of the vertical liquid cooling plate 15 needs to be provided with the second water inlet 152 and the second water outlet 153.

Further, a second water inlet 152 is disposed adjacent to the liquid cooled bottom plate 13, and a second water outlet 153 is disposed adjacent to the case cover 12. Specifically, in this embodiment, since the vertical liquid cooling plate 15 is vertically disposed, the second water inlet 152 is disposed near the liquid cooling bottom plate 13, and the second water outlet 153 is disposed near the box cover 12, when the cooling medium is input to the second flow channel 151, the second water inlet 152 is lower than the second water outlet 153, so that the gas in the vertical liquid cooling plate 15 can be conveniently flowed out from the second water outlet 153, the accumulated gas in the vertical liquid cooling plate 15 can be prevented, and the gas is prevented from affecting the cooling effect of the vertical liquid cooling plate 15.

As shown in fig. 11, in this embodiment, an integrated battery pack 1 is further disclosed, where the integrated battery pack 1 includes at least two single-layer battery packs 101, at least two single-layer battery packs 101 are stacked, the single-layer battery packs 101 include the above liquid-cooled electric box 10, and a plurality of double-row modules 20 are accommodated in the liquid-cooled electric box 10.

Specifically, in this embodiment, the upper mounting frame 111 and the lower mounting frame 112 are provided with relatively penetrating mounting holes, and bolts sequentially pass through the mounting holes of the upper mounting frame 111 of one single-layer battery pack 101 and the mounting holes of the lower mounting frame 112 of the adjacent single-layer battery pack 101 and then are connected with nuts in a threaded manner so as to connect the two single-layer battery packs 101. Preferably, the mounting holes of the plurality of single-layer battery packs 101 are aligned up and down.

Further, two of the two opposite coamings 113 of the liquid cooling electric box 10 are provided with process holes 121, the process holes 121 are covered by a sealing plate assembly 122, the double-row module 20 is mounted on the liquid cooling bottom plate 13 through the process holes 121, the double-row module 20 is connected to the liquid cooling bottom plate 13 through bolts, a reinforcing rib 123 is arranged between two adjacent process holes 121, lifting holes 1231 are formed in the reinforcing rib 123, and lifting and transportation of the single-layer battery pack 101 or the integrated battery pack 1 can be facilitated. Alternatively, the reinforcing rib 123 may be a single plate structure or a U-shaped bending structure, and may be specifically set according to a specific use scenario, which is not described herein. Preferably, the reinforcing ribs 123 of the plurality of single-layer battery packs 101 are aligned up and down, respectively.

Preferably, the shock pad assembly 1122 is provided at the bottom of the lowermost single-layer battery pack 101, so that it is ensured that the integrated battery pack 1 has good shock absorbing performance after being mounted on a vehicle or other machinery, and safe use is ensured.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. The liquid cooling electric box is characterized in that the liquid cooling electric box (10) comprises a box body, a box cover (12) and a liquid cooling bottom plate (13), the box body comprises an upper mounting frame (111) arranged at the top, a lower mounting frame (112) arranged at the bottom and a plurality of surrounding plates (113) arranged on the periphery, two ends of each surrounding plate (113) are respectively connected with the upper mounting frame (111) and the lower mounting frame (112), the box cover (12) is connected with the upper mounting frame (111), the lower mounting frame (112) is provided with a center hole, the liquid cooling bottom plate (13) is accommodated in the center hole, the bottom surface of the liquid cooling bottom plate (13) coincides with the bottom surface of the lower mounting frame (112), and the liquid cooling bottom plate (13) is used for cooling a double-row module (20) accommodated in the liquid cooling electric box (10).

2. The liquid cooling electric box according to claim 1, characterized in that at least two opposite sides of the center hole are provided with first steps (1121), at least two opposite sides of the liquid cooling bottom plate (13) are provided with second steps (131), at least two of the second steps (131) are provided opposite to at least two of the first steps (1121), and the second steps (131) are abutted to the first steps (1121).

3. The liquid cooling electric box according to claim 2, characterized in that the first step (1121) and the second step (131) and the inner wall of the central hole and the raised outer wall of the liquid cooling bottom plate (13) are bonded by structural adhesive.

4. A liquid-cooled electric box according to claim 3, characterized in that the liquid-cooled electric box (10) further comprises a bottom sealing plate (14), and the bottom sealing plate (14) is arranged at the butt joint of the bottom of the liquid-cooled bottom plate (13) and the bottom of the lower mounting frame (112).

5. The liquid cooling electric box according to claim 4, wherein the liquid cooling bottom plate (13) comprises a plurality of first runners (132) parallel to a first direction, the first runners (132) are arranged at intervals along a second direction, the liquid cooling bottom plate (13) is provided with a first water inlet (133) and a first water outlet (134), the first water inlet (133) and the first water outlet (134) are arranged at two ends of the liquid cooling bottom plate (13) along the first direction, one ends of the first runners (132) are communicated with the first water inlet (133), the other ends of the first runners (132) are communicated with the first water outlet (134), and a cooling medium respectively enters the first runners (132) after passing through the first water inlet (133) and flows out through the first water outlet (134).

6. The liquid-cooled electric box of claim 5, characterized in that the first flow channel (132) has a triangular, trapezoidal or rectangular cross section.

7. The liquid cooling electric box according to claim 1, characterized in that the liquid cooling electric box (10) further comprises a vertical liquid cooling plate (15), the vertical liquid cooling plate (15) is perpendicular to the liquid cooling bottom plate (13), and the vertical liquid cooling plate (15) is arranged between two cell groups (21) of the double-row module (20) and used for cooling the cell groups (21) at the side face.

8. The liquid cooling electric box according to claim 7, wherein the vertical liquid cooling plate (15) comprises a plurality of second flow channels (151) parallel to the first direction, the plurality of second flow channels (151) are arranged at intervals along the third direction, the vertical liquid cooling plate (15) is provided with a second water inlet (152) and a second water outlet (153), the second water inlet (152) and the second water outlet (153) are respectively arranged on two opposite sides perpendicular to the second flow channels (151), one ends of the plurality of second flow channels (151) are communicated with the second water inlet (152), the other ends of the plurality of second flow channels (151) are communicated with the second water outlet (153), and cooling medium respectively enters the plurality of second flow channels (151) after passing through the second water inlet (152) and flows out through the second water outlet (153).

9. The liquid-cooled electric box according to claim 8, characterized in that the second water inlet (152) is arranged close to the liquid-cooled bottom plate (13), and the second water outlet (153) is arranged close to the box cover (12).

10. An integrated battery pack, wherein the integrated battery pack (1) comprises at least two single-layer battery packs (101), and at least two single-layer battery packs (101) are stacked, and the integrated battery pack is characterized in that the single-layer battery packs (101) comprise a liquid cooling electric box (10) according to any one of claims 1-9, and a plurality of double-row modules (20) are accommodated in the liquid cooling electric box (10).