Battery device

Abstract

The utility model relates to the technical field of energy storage equipment, and particularly discloses a battery device which comprises a box body with an accommodating cavity, a plurality of battery cell modules arranged in the accommodating cavity, and a heat management structure for carrying out heat management on the battery cell modules, the heat management structure comprises a liquid inlet flow channel, a liquid inlet communicating with the liquid inlet flow channel, a liquid outlet flow channel, a liquid outlet communicating with the liquid outlet flow channel and a plurality of heat exchange plates located in the containing cavity, cavities are formed in the heat exchange plates, and the heat exchange plates are arranged into a plurality of rows in the first direction; the plurality of rows of heat exchange plates are respectively arranged between two adjacent battery cells in the plurality of battery cell modules, and the heat management structure further comprises first flexible pipes which are communicated with the cavities of the different rows of heat exchange plates. According to the battery device provided by the utility model, when a plurality of battery cells in the same battery cell module are fixed by using structures such as a steel belt and the like, the battery cells and the heat exchange plate can be tightly attached to form a whole, and when two adjacent battery cell modules are mounted in the accommodating cavity, some dislocation can be allowed.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage equipment, in particular to a battery device. Background Art

[0002] At present, with the continuous improvement of the monomer scale and energy density of energy storage devices, the traditional solution of using air cooling structure to manage the thermal performance of battery devices has gradually shown its shortcomings in efficiency. In the prior art, in order to ensure the thermal management efficiency of the battery cells in the battery device, more and more immersion thermal management structures are used, that is, the battery cells are directly immersed in the heat exchange fluid, and the battery cells are cooled by relying on the high specific heat capacity and thermal conductivity of the heat exchange fluid. The immersion thermal management structure can fully utilize the outer surface of the battery cell to cool the battery cell, has high heat dissipation efficiency, and is not affected by altitude factors.

[0003] In an existing battery device adopting an immersion thermal management structure, a plurality of heat exchange plates are fixed in the box body. The heat exchange plates are arranged at intervals in the box body. The battery cells are arranged between two adjacent heat exchange plates and positioned by the heat exchange plates. Moreover, one heat exchange plate passes through multiple columns of battery cells, and each column of battery cells is a battery cell module. In this case, due to the assembly gap between the battery cells and the heat exchange plates, the battery cells cannot be reliably positioned. When the battery cells of the same battery cell module are tied and fixed with steel strips, the battery cells will be damaged. In addition, the misalignment of the battery cell modules will also generate shear force on the same heat exchange plate, thereby reducing the strength of the heat exchange plate or even damaging it, and also affecting the flow of the heat exchange fluid in the heat exchange plate. Utility Model Content

[0004] The utility model aims to provide a battery device which can eliminate the gap between the battery core and the heat exchange plate and can allow a slight misalignment when the battery core module is installed.

[0005] To achieve the above-mentioned purpose, the utility model provides a battery device, comprising a box body with a accommodating cavity, a plurality of battery cell modules arranged in the accommodating cavity, and a thermal management structure for thermal management of the battery cell modules, wherein the plurality of battery cell modules are arranged at intervals along a first direction, and each battery cell module comprises a plurality of battery cells arranged at intervals along a second direction perpendicular to the first direction, and the thermal management structure comprises a liquid inlet channel, a liquid inlet connected to the liquid inlet channel, a liquid outlet channel, a liquid outlet connected to the liquid outlet channel, and a plurality of heat exchange plates located in the accommodating cavity, a cavity is formed inside the heat exchange plate, the plurality of heat exchange plates are arranged in a plurality of rows along the first direction, and the heat exchange plates in the plurality of rows are respectively arranged between two adjacent battery cells in the plurality of battery cell modules, and the thermal management structure further comprises a first flexible tube connecting the cavities of the heat exchange plates in different rows, and the cavities of the heat exchange plates in different rows connected by the first flexible tube connect the liquid inlet channel and the liquid outlet channel.

[0006] As a further improvement of the present utility model, the thermal management structure also includes a liquid inlet pipe and a liquid outlet pipe extending along the second direction, and the liquid inlet pipe and the liquid outlet pipe are respectively located on both sides of a plurality of the heat exchange plates in the first direction, the liquid inlet flow channel is formed in the liquid inlet pipe, and the liquid outlet flow channel is formed in the liquid outlet pipe. The thermal management structure also includes a second flexible pipe connecting the liquid inlet flow channel and the cavity of the heat exchange plate close to the liquid inlet pipe, and a third flexible pipe connecting the liquid outlet flow channel and the cavity of the heat exchange plate close to the liquid outlet pipe.

[0007] As a further improvement of the utility model, a plurality of the heat exchange plates are arranged in multiple rows along the second direction, the first flexible tube connects the cavities of adjacent heat exchange plates in the same row, and the cavities of the heat exchange plates in the same row are connected to both the liquid inlet channel and the liquid outlet channel.

[0008] As a further improvement of the present invention, the first flexible tube, the second flexible tube and the third flexible tube are all corrugated tubes.

[0009] As a further improvement of the utility model, the heat exchange plate is provided with a plurality of openings communicating with the accommodating chamber and the cavity, and the plurality of openings are provided on the upper end surface and / or the lower end surface of the heat exchange plate.

[0010] As a further improvement of the utility model, the plurality of heat exchange plates are arranged into a plurality of layers along an up-and-down direction, wherein the up-and-down direction is perpendicular to the first direction and the second direction, and there is a gap between two adjacent layers of heat exchange plates.

[0011] As a further improvement of the present invention, the number of the liquid inlet pipes and the liquid outlet pipes are the same as the number of layers of the plurality of heat exchange plates, so that the number of the liquid inlet flow channels and the liquid outlet flow channels are the same as the number of layers of the plurality of heat exchange plates, and the cavities of the plurality of heat exchange plates in each layer are correspondingly connected to a liquid inlet flow channel and a liquid outlet flow channel, and the thermal management structure further includes a first main pipe, a plurality of first branch pipes connecting the first main pipe and each liquid inlet flow channel, a second main pipe, and a plurality of second branch pipes connecting the second main pipe and each liquid outlet flow channel, the liquid inlet is formed on the first main pipe, and the liquid outlet is formed on the second main pipe.

[0012] As a further improvement of the present invention, the upper end surfaces of the several heat exchange plates in the uppermost layer are lower than the upper end surfaces of the battery cells, and the lower end surfaces of the several heat exchange plates in the lowermost layer are higher than the lower end surfaces of the battery cells.

[0013] As a further improvement of the present invention, the heat exchange plate is made of metal material, and the battery device further includes an insulating film arranged between the heat exchange plate and the battery core.

[0014] As a further improvement of the present invention, the size of the battery cell in the first direction is greater than the size of the battery cell in the second direction.

[0015] Beneficial effects of the utility model:

[0016] The battery device provided by the utility model has a plurality of heat exchange plates in a accommodating cavity in which the positions can be floatingly adjusted to adapt to the positions of battery cells during actual installation; when a plurality of battery cells in the same battery cell module are fixed using structures such as steel belts, the battery cells and the heat exchange plates can be tightly fitted to form a whole; when two adjacent battery cell modules are installed in the accommodating cavity, slight misalignment in the first direction and the second direction is allowed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of an exploded structure of a battery device provided in one embodiment of the utility model;

[0018] Figure 2 for Figure 1 A schematic diagram of the structure of the battery device after removing the box and some cells;

[0019] Figure 3 for Figure 1 A schematic top view of the battery device with the box removed;

[0020] Figure 4 for Figure 3 A schematic cross-sectional view of the structure shown in FIG. 1 after being cut along the BB direction;

[0021] Figure 5 for Figure 2 A is an enlarged schematic diagram.

[0022] Figure 6 for Figure 1 A schematic side view of several battery cells and several heat exchange plates;

[0023] Figure 7 for Figure 6 The enlarged schematic diagram of point C in the middle. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below in conjunction with the embodiments shown in the accompanying drawings. However, the embodiments do not limit the present invention, and any changes in mechanism, method, or function made by a person skilled in the art based on the embodiments are all within the protection scope of the present invention.

[0025] The terms used herein, such as "upper", "lower", "left", "right", "front", "back", etc., which indicate relative spatial positions, are used for the purpose of convenience to describe the relationship between one feature and another feature as shown in the accompanying drawings. It is understood that, depending on the placement of the product, the terms of relative spatial positions may be intended to include different orientations other than those shown in the drawings, and should not be construed as limitations on the claims. In addition, the descriptor "horizontal" used herein is not completely equivalent to being perpendicular to the direction of gravity, and a certain angle of inclination is allowed.

[0026] like Figure 1-5 As shown, an embodiment of the present invention provides a battery device 100, which includes a box body 10 with a receiving cavity 11, a plurality of battery modules 20 arranged in the receiving cavity 11, and a thermal management structure 30 for thermal management of the battery modules 20. In this article, a plurality should be understood as greater than or equal to 2. For the convenience of explanation, Figure 1 In the coordinate system in the lower right corner, the X-axis represents the first direction of the battery device 100 , the Y-axis represents the second direction of the battery device 100 , and the Z-axis represents the up-down direction of the battery device 100 .

[0027] A plurality of battery modules 20 are arranged at intervals along a first direction, and each battery module 20 includes a plurality of battery cells 21 arranged at intervals along a second direction, and the second direction is perpendicular to the first direction. It can be seen that the plurality of battery cells 21 in the plurality of battery modules 20 are arranged in multiple rows and columns as a whole, that is, they are arranged in multiple columns along the first direction and in multiple rows along the second direction.

[0028] The thermal management structure 30 includes a liquid inlet channel 31, a liquid inlet 311 connected to the liquid inlet channel 31, a liquid outlet channel 32, a liquid outlet 321 connected to the liquid outlet channel 32, and a plurality of heat exchange plates 33 located in the accommodating chamber 11. A cavity 331 is formed inside the heat exchange plate 33, and the heat exchange liquid can enter the liquid inlet channel 31 from the liquid inlet 311. The plurality of heat exchange plates 33 are arranged in a plurality of rows along the first direction, and the plurality of rows of heat exchange plates 33 are respectively arranged between two adjacent cells 21 in a plurality of battery modules 20, and a row of heat exchange plates 33 is correspondingly arranged between a plurality of battery cells 21 in each battery module 20. The thermal management structure 30 also includes a first flexible tube 34 connecting the cavities 331 of different rows of heat exchange plates 33, and the cavities 331 of different rows of heat exchange plates 33 connected by the first flexible tube 34 connect the liquid inlet channel 31 and the liquid outlet channel 32.

[0029] After the heat exchange liquid flows into the liquid inlet channel 31 from the liquid inlet port 311, it will flow into the cavities 331 of the heat exchange plates 33 of different columns connected by the first flexible tube 34 from the liquid inlet channel 31. When the heat exchange liquid flows through the cavities 331 of the heat exchange plates 33 of different columns, it will exchange heat with the battery cells 21 in different battery cell modules 20 to regulate the temperature of the battery cells 21. After that, the heat exchange liquid will flow into the liquid outlet channel 32 and finally flow out from the liquid outlet port 321. The heat exchange liquid can be a cooling liquid, which plays a role in cooling the battery cells 21. It can be imagined that when the battery cells 21 need to be heated, the heat exchange liquid can be a heating liquid. In the following description, the heat exchange liquid is explained as a cooling liquid.

[0030] The first flexible tube 34 can be flexibly deformed, so the positions of the several heat exchange plates 33 in the accommodating cavity 11 can be floatingly adjusted to adapt to the positions of the battery cells 21 during actual installation. When the several battery cells 21 in the same battery cell module 20 are fixed using structures such as steel belts, the battery cells 21 and the heat exchange plates 33 can be tightly fitted to form a whole. When two adjacent battery cell modules 20 are installed in the accommodating cavity 11, some misalignment in the first direction and the second direction is allowed.

[0031] Furthermore, the thermal management structure 30 includes a liquid inlet pipe 35 and a liquid outlet pipe 36 extending along the second direction, and the liquid inlet pipe 35 and the liquid outlet pipe 36 are respectively located on both sides of the plurality of heat exchange plates 33 in the first direction, the liquid inlet channel 31 is formed in the liquid inlet pipe 35, and the liquid outlet channel 32 is formed in the liquid outlet pipe 36. The thermal management structure 30 also includes a second flexible pipe 37 connecting the liquid inlet channel 31 and the cavity 331 of the heat exchange plate 33 close to the liquid inlet pipe 35, and a third flexible pipe 38 connecting the liquid outlet channel 32 and the cavity 331 of the heat exchange plate 33 close to the liquid outlet pipe 36. With the above arrangement, the position of the heat exchange plate 33 near the liquid inlet pipe 35 in the accommodating chamber 11 can be floated and adjusted, and the battery cell module 20 near the liquid inlet pipe 35, when installed in the accommodating chamber 11, can be slightly misaligned relative to the liquid inlet pipe 35 in the first direction and the second direction; the position of the heat exchange plate 33 near the liquid outlet pipe 36 in the accommodating chamber 11 can be floated and adjusted, and the battery cell module 20 near the liquid outlet pipe 36, when installed in the accommodating chamber 11, can be slightly misaligned relative to the liquid outlet pipe 36 in the first direction and the second direction.

[0032] The box body 10 includes a first side wall 12 and a second side wall 13 located on both sides of the accommodating cavity 11 in a first direction. In other embodiments of the utility model, the first side wall 12 and the second side wall 13 may be a sandwich design, that is, the liquid inlet channel 31 and the liquid outlet channel 32 are formed in the first side wall 12 and the second side wall 13 respectively, the second flexible tube 37 connects the liquid inlet channel 31 and the cavity 331 of the heat exchange plate 33 close to the first side wall 12, and the third flexible tube 38 connects the liquid outlet channel 32 and the cavity 331 of the heat exchange plate 33 close to the second side wall 13.

[0033] It can be seen from the above that when a plurality of heat exchange plates 33 are arranged between a plurality of battery cells 21, they are distributed in multiple rows and columns, that is, a plurality of heat exchange plates 33 are arranged in multiple columns along the first direction and in multiple rows along the second direction. In this embodiment, the first flexible tube 34 connects the cavities 331 of two adjacent heat exchange plates 33 in the same row, and the cavities 331 of the heat exchange plates 33 in the same row connected by the first flexible tube 34 are connected to both the liquid inlet channel 31 and the liquid outlet channel 32, that is, among the plurality of heat exchange plates 33 in the same row, the cavity 331 of the heat exchange plate 33 close to the liquid inlet tube 35 is connected to the liquid inlet channel 31 through the second flexible tube 37, and the cavity 331 of the heat exchange plate 33 close to the liquid outlet tube 36 is connected to the liquid outlet channel 32 through the third flexible tube 38. With the above arrangement, the lengths required for the first flexible tube 34, the second flexible tube 37 and the third flexible tube 38 are the shortest, and the arrangement is also more reasonable.

[0034] In this embodiment, the number of the battery cell modules 20 is 4, and the number of the battery cells 21 in each battery cell module 20 is 13. Figure 3 As shown, a total of 52 cells 21 of the four cell modules 20 are arranged in 4 columns along the first direction and 13 rows along the second direction. A plurality of heat exchange plates 33 are arranged between two adjacent cells 21 along the second direction, and the number of columns is the same as the number of columns of the plurality of cells 21. A row of heat exchange plates 33 is arranged between two adjacent rows of cells 21. The first flexible tube 34 is connected to the cavities 331 of the four heat exchange plates 33 in each row. Among the four heat exchange plates 33 in each row, the heat exchange plate 33 close to the liquid inlet pipe 35 is connected to the liquid inlet channel 31 through the second flexible tube 37, and the heat exchange plate 33 close to the liquid outlet pipe 36 is connected to the liquid outlet channel 32 through the third flexible tube 38.

[0035] The size of the heat exchange plate 33 in the first direction is substantially equal to the size of the battery cell 21 in the first direction. The size of the heat exchange plate 33 in the second direction (i.e., the distance between two adjacent battery cells 21 in the second direction) is 5 mm, and the size in the vertical direction is 20 mm. The wall thickness of the heat exchange plate is 1 mm, so the size of its cavity in the second direction is 3 mm, and the size in the vertical direction is 18 mm.

[0036] Of course, in other embodiments, the number of battery cell modules 20 and the number of battery cells 21 in each battery cell module 20 , and the size of the heat exchange plate 33 may be different from those in this embodiment, and are not limited here.

[0037] It should be noted that, if the requirements are met, a row of heat exchange plates 33 can be provided every two or more rows of battery cells 21 , and there is no need to provide a row of heat exchange plates 33 between every two rows of battery cells 21 .

[0038] In other embodiments, the first flexible tube 34 may also connect the cavities 331 of the heat exchange plates 33 in different rows. For example, the first flexible tube 34 may sequentially connect the cavities 331 of the heat exchange plates 33 in the first row of the first column and the second row of the second column, the cavities 331 of the heat exchange plates 33 in the second row of the second column and the first row of the third column, and the cavities 331 of the heat exchange plates 33 in the first row of the third column and the second row of the fourth column.

[0039] In this embodiment, the first flexible tube 34, the second flexible tube 37 and the third flexible tube 38 are preferably made of corrugated tubes, the side walls of which have corrugated folds and can be bent and stretched well. In other embodiments, the first flexible tube 34, the second flexible tube 37 and the third flexible tube 38 can also be made of rubber tubes, PU tubes, etc.

[0040] The heat exchange plate 33 is provided with a plurality of openings 332 connecting the accommodating cavity 11 and the cavity 331. After the heat exchange liquid flows into the cavity 331 of the heat exchange plate 33, it can also flow out from the openings 332 into the accommodating cavity 11. The heat exchange liquid in the accommodating cavity 11 can also flow into the cavity 331 of the heat exchange plate 33 from the openings 332. In this way, the multiple battery cells 21 in the accommodating cavity 11 can be directly immersed in the heat exchange liquid, and the heat exchange liquid can fully contact the battery cells 21 to effectively cool the battery cells 21. The plurality of openings 332 are provided on the upper end face and / or the lower end face of the heat exchange plate 33, that is, the heat exchange liquid flows into the accommodating cavity 11 from the upper side and / or the lower side of the heat exchange plate 33. The number and size of the openings 332 are set according to actual needs and are not limited here. The diameters of the first flexible tube 34 , the second flexible tube 37 , the third flexible tube 38 , the liquid outlet channel 32 , and the liquid inlet channel 31 are designed according to requirements so that the flow rate of the heat exchange liquid between the battery cells 21 is uniform.

[0041] The size of the battery cell 21 in the first direction is larger than its size in the second direction. In this way, the heat exchange plate 33 is arranged between the "large surfaces" of the two battery cells 21, and the heat exchange fluid entering and exiting the cavity 331 of the heat exchange plate 33 from the opening 322 also flows through the "large surface" of the battery cell 21. The heat exchange fluid can fully take away the heat from the battery cell 21.

[0042] Further, continue to combine Figure 6-7 As shown, the plurality of heat exchange plates 33 are further arranged into a plurality of layers along the up-down direction, wherein the up-down direction is perpendicular to the first direction and the second direction, and there is a gap between two adjacent layers of heat exchange plates 33, so that a channel 22 for the flow of heat exchange fluid is formed between the two adjacent layers of heat exchange plates 33, and the heat exchange fluid flows in the channel 22 to take away the heat from the battery cell 21.

[0043] The number of liquid inlet pipes 35 and liquid outlet pipes 36 is the same as the number of layers of the plurality of heat exchange plates 33, so that the number of liquid inlet channels 31 and liquid outlet channels 32 is the same as the number of layers of the plurality of heat exchange plates 33, and the cavities 331 of the plurality of heat exchange plates 33 in each layer are correspondingly connected to a liquid inlet channel 31 and a liquid outlet channel 32. The thermal management structure 30 further includes a first main pipe 391, a plurality of first branch pipes 392 connecting the first main pipe 391 and each liquid inlet channel 31, a second main pipe 393, and a plurality of second branch pipes 394 connecting the second main pipe 393 and each liquid outlet channel 32. The liquid inlet 311 is formed on the first main pipe 391, and the liquid outlet 321 is formed on the second main pipe 393.

[0044] With the above arrangement, each layer of the heat exchange plates 33 is equipped with a liquid inlet pipe 35 and a liquid outlet pipe 36. The heat exchange liquid can flow into the liquid inlet pipes 35 from the liquid inlet port 311 through the first main pipe 391 and the first branch pipes 392. The heat exchange liquid in the liquid outlet pipes 36 can flow out from the liquid outlet port 321 through the second main pipe 393 and the second branch pipes 394. The box body 10 also includes an upper cover 14 for closing the accommodating chamber 11. The first main pipe 391 and the second main pipe 393 can be respectively arranged at two diagonal positions of the box body 10 and extend from the upper cover 14 to the outside of the accommodating chamber 11. The liquid inlet port 311 and the liquid outlet port 321 are also located outside the accommodating chamber 11.

[0045] Furthermore, the upper end surfaces of the several heat exchange plates 33 in the uppermost layer are lower than the upper end surfaces of the battery cells 21, and the lower end surfaces of the several heat exchange plates 33 in the lowermost layer are higher than the lower end surfaces of the battery cells 21. In this way, channels 22 for the flow of heat exchange fluid are formed above the several heat exchange plates 33 in the uppermost layer and below the several heat exchange plates 33 in the lowermost layer.

[0046] In this embodiment, the heat exchange plates 33 are arranged in two layers in the vertical direction, and two liquid inlet pipes 35 and two liquid outlet pipes 36 are provided accordingly. In other embodiments, the heat exchange plates 33 can also be arranged in other layers, and the size of the interval between two adjacent layers of heat exchange plates 33 can also be set according to actual needs, which is not limited here.

[0047] In this embodiment, the heat exchange plate 33 is made of a metal material to have good thermal conductivity, and the battery device 100 further includes an insulating film disposed between the heat exchange plate 33 and the battery cell 21, which can prevent a short circuit caused by direct contact between the battery cell 21 and the heat exchange plate 33. Alternatively, a layer of insulating paint can be sprayed on the outer surface of the heat exchange plate 33.

[0048] It should be understood that although the present specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0049] The above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person skilled in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A battery device, comprising a box having a receiving cavity, a plurality of battery modules arranged in the receiving cavity, and a thermal management structure for thermally managing the battery modules, wherein the plurality of battery modules are arranged at intervals along a first direction, and each battery module comprises a plurality of battery cells arranged at intervals along a second direction perpendicular to the first direction, characterized in that: The thermal management structure includes a liquid inlet channel, a liquid inlet connected to the liquid inlet channel, a liquid outlet channel, a liquid outlet connected to the liquid outlet channel, and a plurality of heat exchange plates located in the accommodating cavity, wherein a cavity is formed inside the heat exchange plate, and the plurality of heat exchange plates are arranged in a plurality of rows along a first direction, and the plurality of rows of heat exchange plates are respectively arranged between two adjacent battery cells in a plurality of battery cell modules, and the thermal management structure also includes a first flexible tube connecting the cavities of heat exchange plates in different rows, and the cavities of heat exchange plates in different rows connected by the first flexible tube connect the liquid inlet channel and the liquid outlet channel.

2. The battery device according to claim 1, characterized in that: The thermal management structure further includes a liquid inlet pipe and a liquid outlet pipe extending in the second direction, and the liquid inlet pipe and the liquid outlet pipe are respectively located on both sides of the plurality of heat exchange plates in the first direction, the liquid inlet flow channel is formed in the liquid inlet pipe, and the liquid outlet flow channel is formed in the liquid outlet pipe. The thermal management structure further includes a second flexible pipe connecting the liquid inlet flow channel and the cavity of the heat exchange plate close to the liquid inlet pipe, and a third flexible pipe connecting the liquid outlet flow channel and the cavity of the heat exchange plate close to the liquid outlet pipe.

3. The battery device according to claim 2, characterized in that: The heat exchange plates are arranged in multiple rows along the second direction, the first flexible pipe is connected to the cavities of adjacent heat exchange plates in the same row, and the cavities of the heat exchange plates in the same row are connected to both the liquid inlet channel and the liquid outlet channel.

4. The battery device according to claim 2, characterized in that: The first flexible tube, the second flexible tube and the third flexible tube are all corrugated tubes.

5. The battery device according to claim 1, characterized in that: The heat exchange plate is provided with a plurality of openings communicating with the accommodating cavity and the cavity, and the plurality of openings are provided on the upper end surface and / or the lower end surface of the heat exchange plate.

6. The battery device according to claim 2, characterized in that: The plurality of heat exchange plates are further arranged into a plurality of layers along an up-and-down direction, wherein the up-and-down direction is perpendicular to the first direction and the second direction, and there is a gap between two adjacent layers of heat exchange plates.

7. The battery device according to claim 6, characterized in that: The number of the liquid inlet pipes and the liquid outlet pipes are the same as the number of layers of the plurality of heat exchange plates, so that the number of the liquid inlet flow channels and the liquid outlet flow channels are the same as the number of layers of the plurality of heat exchange plates, and the cavities of the plurality of heat exchange plates in each layer are correspondingly connected to a liquid inlet flow channel and a liquid outlet flow channel. The thermal management structure further includes a first main pipe, a plurality of first branch pipes connecting the first main pipe and each liquid inlet flow channel, a second main pipe, and a plurality of second branch pipes connecting the second main pipe and each liquid outlet flow channel. The liquid inlet is formed on the first main pipe, and the liquid outlet is formed on the second main pipe.

8. The battery device according to claim 6, characterized in that: The upper end surfaces of the plurality of heat exchange plates in the uppermost layer are lower than the upper end surfaces of the battery cores, and the lower end surfaces of the plurality of heat exchange plates in the lowermost layer are higher than the lower end surfaces of the battery cores.

9. The battery device according to claim 5, characterized in that: The heat exchange plate is made of metal material, and the battery device further includes an insulating film arranged between the heat exchange plate and the battery core.

10. The battery device according to claim 1, characterized in that: The size of the battery cell in the first direction is greater than the size of the battery cell in the second direction.

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