Battery device and electric device

Abstract

The battery device comprises a box body, a battery single body assembly and a heat exchange assembly, the battery single body assembly is arranged in the box body and comprises a plurality of battery single bodies, the heat exchange assembly is used for exchanging heat with the battery single bodies and comprises at least one heat exchange unit, and the heat exchange unit is provided with a heat exchange runner part; the heat exchange unit comprises a heat exchange runner part, a heat exchange runner used for conducting a heat exchange medium is arranged in the heat exchange runner part, the heat exchange runner part comprises straight pipe sections extending along a straight line and bent pipe sections extending along an arc line, the bent pipe sections are connected between every two adjacent straight pipe sections in the extending direction of the heat exchange unit, the ratio of the bending radius R of each bent pipe section to the width W of the heat exchange runner part is k, and k is larger than 0.5. According to the battery device provided by the invention, the heat exchange assembly of the battery device can well consider the heat exchange efficiency and light weight requirements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device and a power utilization device. BACKGROUND

[0002] In the related art, in order to make the battery device work in a suitable temperature range, a heat exchange assembly is usually arranged to exchange heat with the battery monomer of the battery device to adjust the temperature of the battery monomer. The heat exchange assembly in the related art has the problem of relatively large weight, which leads to relatively low heat exchange efficiency per unit mass, thus resulting in relatively large weight of the entire battery device, which is not conducive to the lightweight demand of the battery device. Therefore, how to balance the heat exchange efficiency and the lightweight demand of the heat exchange assembly is a technical problem to be solved. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a battery device and a power utilization device, and the heat exchange assembly of the battery device can better balance the heat exchange efficiency and the lightweight demand.

[0004] In a first aspect, the present application provides a battery device, which comprises: a box body; a battery monomer assembly arranged in the box body and comprising a plurality of battery monomers; and a heat exchange assembly for exchanging heat with the battery monomers, wherein the heat exchange assembly comprises at least one heat exchange unit, the heat exchange unit has a heat exchange flow channel portion, the heat exchange flow channel portion has a heat exchange flow channel for conducting a heat exchange medium, the heat exchange flow channel portion comprises a straight pipe segment extending along a straight line and a bent pipe segment extending along an arc, and in the extension direction of the heat exchange unit, the bent pipe segment is connected between adjacent two straight pipe segments, and the ratio of the bending radius R of the bent pipe segment to the width W of the heat exchange flow channel portion is k, and k is greater than 0.5.

[0005] In the above technical solution, the heat exchange assembly for adjusting the temperature of the battery monomers is arranged to comprise at least one heat exchange unit, by arranging the heat exchange flow channel portion of the heat exchange unit to comprise a straight pipe segment and a bent pipe segment, the heat exchange flow channel portion can be bent and extended, at least part of the heat exchange unit is arranged in the bent and extended heat exchange pipe structure, which can make the heat exchange flow channel portion of the heat exchange unit compactly arranged, so that the pipe arrangement density of the heat exchange unit per unit area is large, the heat exchange area of the heat exchange unit and the battery monomer assembly can be increased, thereby the heat exchange capacity of the heat exchange assembly per unit area can be improved, the temperature adjustment efficiency of the heat exchange assembly on the battery monomer assembly can be improved, and the overall weight of the heat exchange pipe structure is relatively light, which is conducive to the lightweight of the battery device and the improvement of the heat exchange efficiency per unit mass of the heat exchange assembly. In addition, by making the ratio of the bending radius of the bent pipe segment to the width of the heat exchange flow channel portion greater than 0.5, it is convenient to bend and form the heat exchange flow channel portion in the process of processing the bent heat exchange unit.

[0006] In some embodiments, the value of k ranges from 1.0 to 1.5.

[0007] In the above technical solution, the ratio of the bending radius of the bent pipe section to the width of the heat exchange flow passage part is not less than 1.0, which can reduce the process difficulty of the heat exchange unit in the bending process, and the ratio of the bending radius of the bent pipe section to the width of the heat exchange flow passage part is not greater than 1.5, which can make the pipe arrangement density of the heat exchange unit larger, thereby making the heat exchange area of the heat exchange unit larger. By setting the ratio of the bending radius of the bent pipe section to the width of the heat exchange flow passage part to be between 1.0 and 1.5, the bending process difficulty and the heat exchange area of the heat exchange unit can be better balanced, and the processing difficulty of the heat exchange assembly is reduced and the heat exchange area is larger.

[0008] In some embodiments, the plurality of straight pipe sections in a single heat exchange flow passage part includes a plurality of first straight pipe sections arranged in a first direction in sequence, each first straight pipe section extends in a second direction, the plurality of bent pipe sections in a single heat exchange flow passage part includes a first bent pipe section, the first bent pipe section is connected between the same end of two adjacent first straight pipe sections in the second direction, the positive projection of the first straight pipe section and the first bent pipe section in a third direction is located in the positive projection of the battery monomer assembly in the third direction, and the third direction, the second direction and the first direction intersect with each other.

[0009] In the above technical solution, by arranging a plurality of first straight pipe sections of a single heat exchange unit in a first direction and connecting two adjacent first straight pipe sections through a first bent pipe section, the arrangement density of the pipe of the heat exchange unit can be improved, thereby the heat exchange area of the heat exchange unit can be further improved, and the temperature regulation efficiency of the heat exchange assembly for the battery monomer assembly can be further improved.

[0010] In some embodiments, the extension length L of the first straight pipe section is greater than or equal to 50mm.

[0011] In the above technical solution, in the process of bending the heat exchange flow passage part of the heat exchange unit using a bending die to form the first straight pipe section and the first bent pipe section connected between two adjacent first straight pipe sections, the first straight pipe section needs to be clamped and fixed to form the first bent pipe section. By making the extension length of the first straight pipe section arranged in the first direction not less than 50mm, the first straight pipe section has a longer length for clamping and fixing, which improves the clamping and fixing reliability of the first straight pipe section, thereby the bending forming quality of the heat exchange unit can be improved.

[0012] In some embodiments, the distance d1 of two adjacent first straight pipe sections in the same heat exchange flow passage part in the first direction is greater than the width W of the first straight pipe section.

[0013] In the technical solution, the interval d1 of the two first straight pipe sections in the first direction is greater than the width W of the first straight pipe section, so that the bending process difficulty of the first bent pipe section of the heat exchange unit is reduced.

[0014] In some embodiments, the ratio of the interval d1 of the two first straight pipe sections in the first direction to the width W of the first straight pipe section is less than 2.

[0015] In the technical solution, the interval d1 of the two first straight pipe sections in the first direction is greater than the width W of the first straight pipe section, and the ratio of the interval d1 of the two first straight pipe sections in the first direction to the width W of the first straight pipe section is less than 2, that is, the ratio of the interval d1 of the two first straight pipe sections in the first direction to the width W of the first straight pipe section is greater than 1 and less than 2, so that the arrangement density of the first straight pipe sections in the first direction is large, and the bending process difficulty and the heat exchange area of the heat exchange unit are well balanced.

[0016] In some embodiments, the ratio of the extension length of the first straight pipe section to the extension length of the first bent pipe section is 0.7-2.

[0017] In the technical solution, the ratio of the extension length of the first straight pipe section to the extension length of the first bent pipe section is not less than 0.7, so that the extension length of the first bent pipe section is large, the first bent pipe section has a large bending radius, the bending process difficulty of the first bent pipe section is reduced, and the ratio of the extension length of the first straight pipe section to the extension length of the first bent pipe section is not greater than 2, so that the extension length of the first bent pipe section is appropriate, the interval of the adjacent first straight pipe sections in the first direction is not too large, and the bending process difficulty and the heat exchange area of the heat exchange unit are well balanced by setting the ratio of the extension length of the first straight pipe section to the extension length of the first bent pipe section to 0.7-2.

[0018] In some embodiments, all the first straight pipe sections and all the first bent pipe sections in a single heat exchange flow channel part constitute a bending body, and the heat exchange units are multiple, and the bending bodies of the multiple heat exchange units are arranged in sequence in the first direction.

[0019] In the technical solution, the heat exchange unit is provided as a plurality of units, which can increase the heat exchange area of the heat exchange assembly, and the bending bodies of the plurality of heat exchange units are arranged along the first direction in sequence, which can increase the arrangement density of the plurality of heat exchange units, thereby increasing the arrangement density of the pipelines of the entire heat exchange assembly, and better increasing the heat exchange area of the heat exchange assembly, so that the heat exchange efficiency of the heat exchange assembly for the battery monomer assembly can be better improved.

[0020] In some embodiments, the distance between two adjacent first straight pipe sections in the same bending body in the first direction is d1, the distance between two adjacent first straight pipe sections in the same bending body in the first direction is d2, and d2 is less than d1.

[0021] In the technical solution, the distance d2 between two adjacent first straight pipe sections in the same bending body in the first direction is not affected by the bending process, and by setting the distance between two adjacent first straight pipe sections in the same bending body in the first direction to be relatively small, the arrangement density of the pipelines of the heat exchange assembly can be increased without increasing the difficulty of the bending process, thereby increasing the heat exchange area of the heat exchange assembly.

[0022] In some embodiments, all the first straight pipe sections and all the first elbow pipe sections in a single heat exchange flow channel part constitute a bending body, the plurality of straight pipe sections in a single heat exchange flow channel part include a second straight pipe section, the second straight pipe section in the same heat exchange flow channel part is located on at least one side of the bending body along the second direction, and the second straight pipe section extends along the first direction and is connected to the first straight pipe section in the same heat exchange flow channel part.

[0023] In the technical solution, by arranging the second straight pipe section in the same heat exchange flow channel part on at least one side of the bending body along the second direction, the arrangement density of the pipelines of a single heat exchange flow channel part can be increased, and the heat exchange area of the heat exchange unit can be increased.

[0024] In some embodiments, the minimum distance d3 between the first elbow pipe section and the second straight pipe section in the same heat exchange flow channel part in the second direction is greater than or equal to 20 mm.

[0025] In the technical solution, by setting the minimum distance d3 between the first elbow pipe section and the second straight pipe section in the same heat exchange flow channel part to be not less than 20 mm, the second straight pipe section and the first elbow pipe section have a relatively large distance, which can reduce the risk of interference between the second straight pipe section and the first elbow pipe section during the bending process of the first elbow pipe section by the bending die, and can reduce the difficulty of the bending process of the heat exchange flow channel part while increasing the arrangement density of the heat exchange flow channel part.

[0026] In some embodiments, the plurality of bent pipe sections in a single heat exchange flow channel section includes a second bent pipe section connecting the first straight pipe section and the second straight pipe section in the same heat exchange flow channel section.

[0027] In the above technical solution, by connecting the first straight pipe section and the second straight pipe section in the same heat exchange flow channel section through the second bent pipe section, the pipe arrangement density of the heat exchange flow channel section can be made larger, and the heat exchange area of the heat exchange flow channel section can be made larger.

[0028] In some embodiments, all the first straight pipe sections and all the first bent pipe sections in a single heat exchange flow channel section constitute a bending body, the heat exchange unit is two, and the bending bodies of the two heat exchange units are arranged along the first direction. The two heat exchange units are respectively a first heat exchange unit and a second heat exchange unit. The first heat exchange unit includes one second straight pipe section, the second straight pipe section of the first heat exchange unit is located on one side of the bending body of the first heat exchange unit along the second direction, the second heat exchange unit includes two second straight pipe sections, the two second straight pipe sections of the second heat exchange unit are located on both sides of the bending body of the second heat exchange unit along the second direction, the bending body has opposite first and second sides in the second direction, the second straight pipe section of the first heat exchange unit and one of the second straight pipe sections in the second heat exchange unit are both located on the first side and arranged along the first direction, and the other second straight pipe section in the second heat exchange unit is located on the second side and extends to the side of the bending body of the first heat exchange unit along the second direction.

[0029] In the above technical solution, the heat exchange unit is provided as two, which can improve the heat exchange area of the heat exchange assembly, and the bending bodies of the two heat exchange units are arranged along the first direction in sequence, which can improve the arrangement density of the two heat exchange units, so that the arrangement density of the pipes of the entire heat exchange assembly is larger, and the heat exchange area of the heat exchange assembly is better improved, so that the heat exchange efficiency of the heat exchange assembly for the battery monomer assembly can be better improved. And by reasonably arranging the second straight pipe section of the first heat exchange unit and the second straight pipe section of the second heat exchange unit on opposite sides of the bending body along the second direction, the pipe arrangement density of the heat exchange assembly can be further improved, and the heat exchange area of the heat exchange assembly can be improved.

[0030] In some embodiments, the minimum distance d3 in the second direction between the first bent pipe section and the second straight pipe section in the same heat exchange flow channel section, and the minimum distance d4 in the second direction between the second straight pipe section on the second side in the second heat exchange unit and the first bent pipe section in the first heat exchange unit are both provided, and d4 is less than d3.

[0031] In the technical solution described above, the distance between the first elbow pipe section and the second straight pipe section of different heat exchange units can be set smaller by taking advantage of the feature that the distance is not limited by the bending process, so that the pipe arrangement density of the heat exchange assembly can be increased, thereby increasing the heat exchange area of the heat exchange assembly.

[0032] In some embodiments, the plurality of straight pipe sections in the second heat exchange unit further include a third straight pipe section and a fourth straight pipe section, the third straight pipe section is located on the side of the bending body in the second heat exchange unit away from the bending body in the first heat exchange unit along the first direction, the third straight pipe section extends along the second direction, the fourth straight pipe section is arranged on the side of the second straight pipe section on the second side away from the bending body along the second direction, the fourth straight pipe section extends along the first direction, and the third straight pipe section is connected between the second straight pipe section and the fourth straight pipe section of the second heat exchange unit.

[0033] In the technical solution described above, by having the second heat exchange unit include a third straight pipe section and a fourth straight pipe section, and by having the bending bodies of the two heat exchange units located in the space enclosed by the first straight pipe section, the second straight pipe section, the third straight pipe section, and the fourth straight pipe section of the two heat exchange units, an outer-enclosed inner structure is formed, which can make the arrangement of the two heat exchange units compact and increase the heat exchange area of the heat exchange assembly.

[0034] In some embodiments, the plurality of elbow pipe sections in the second heat exchange unit further include a third elbow pipe section and a fourth elbow pipe section, the third elbow pipe section is connected between the second straight pipe section and the third straight pipe section of the second heat exchange unit, and the fourth elbow pipe section is connected between the third straight pipe section and the fourth straight pipe section.

[0035] In the technical solution described above, by having the second straight pipe section and the third straight pipe section of the second heat exchange unit connected by an elbow pipe section, and by having the third straight pipe section and the fourth straight pipe section connected by an elbow pipe section, the pipe arrangement density of the heat exchange assembly can be made larger, and the heat exchange area of the heat exchange flow passage part can be made larger.

[0036] In some embodiments, the distance between two adjacent first straight pipe sections in the same heat exchange flow passage part along the first direction is d1, the distance between the third straight pipe section and the nearest first straight pipe section in the first heat exchange unit is d5, and the ratio of d5 to d1 is 0.7-1.5.

[0037] In the technical solution, the third straight pipe section of the second heat exchange unit and the plurality of first straight pipe sections of the two heat exchange units are arranged in the first direction, and the ratio of the spacing d5 between the third straight pipe section and the closest first straight pipe section in the first heat exchange unit to the spacing d1 between two adjacent first straight pipe sections in the same heat exchange channel portion in the first direction is set to be 0.7-1.5, so that the spacing between the straight pipe sections arranged in the first direction is uniform, and the temperature adjustment of the heat exchange assembly on the battery cells is uniform.

[0038] In some embodiments, the spacing between the fourth straight pipe section and the second straight pipe section on the second side in the second direction is d6, the thickness direction of the battery cell is consistent with the second direction, the thickness of the battery cell is t, and d6 is less than t.

[0039] In the technical solution, the spacing d6 between the fourth straight pipe section and the adjacent second straight pipe section in the second direction is less than the thickness dimension t of the battery cell in the second direction, so that the spacing between the fourth straight pipe section and the adjacent second straight pipe section in the second direction is small, and the single battery cell cannot be completely in the gap between the fourth straight pipe section and the adjacent second straight pipe section to achieve effective heat exchange, so that the battery cell in the gap between the fourth straight pipe section and the adjacent second straight pipe section can be in thermal contact with the heat exchange channel portion to be effectively temperature-regulated.

[0040] In some embodiments, the ratio of d6 to t is 0.3-0.8.

[0041] In the technical solution, the ratio of the spacing d6 between the fourth straight pipe section and the adjacent second straight pipe section in the second direction to the thickness dimension t of the battery cell in the second direction is set to be 0.3-0.8, so that the battery cell in the gap between the fourth straight pipe section and the adjacent second straight pipe section can be in thermal contact with the heat exchange channel portion to be effectively temperature-regulated, and the arrangement of the two heat exchange units is facilitated, and the arrangement difficulty is reduced.

[0042] In some embodiments, the battery cell assembly includes one or more battery cell rows arranged in the first direction, and each battery cell row includes a plurality of battery cells arranged in the second direction.

[0043] In the technical solution, the battery monomer assembly is arranged to include one or more battery monomer rows arranged along a first direction, and each battery monomer row includes a plurality of battery monomers arranged along a second direction, so that the plurality of battery monomer rows in the battery monomer assembly are arranged in order and compactly, and the capacity of the battery device is improved; and the arrangement direction of the plurality of battery monomers in each battery monomer row intersects with the extension direction of the first straight pipe segment, so that each first straight pipe segment is in thermal contact with the plurality of battery monomers in the single battery monomer row as much as possible, the single first straight pipe segment can perform heat exchange on the plurality of battery monomers in the battery monomer row, the heat exchange efficiency can be improved, and the heat exchange of the plurality of battery monomers in the battery monomer row is more uniform.

[0044] In some embodiments, the projection of the first straight pipe segment along the third direction is located in the projection of the battery monomer row along the third direction.

[0045] In the technical solution, the projection of the first straight pipe segment along the third direction is located in the projection of the battery monomer row along the third direction, so that the first straight pipe segment is in sufficient contact with the battery monomer row, and the heat exchange of the first straight pipe segment can be fully utilized to regulate the temperature of the battery monomer, and the heat exchange efficiency of the first straight pipe segment is improved.

[0046] In some embodiments, each battery monomer row corresponds to at least one first straight pipe segment, and the projection of the first straight pipe segment corresponding to each battery monomer row along the third direction is located in the projection of the corresponding battery monomer row along the third direction.

[0047] In the technical solution, the projection of the first straight pipe segment corresponding to each battery monomer row along the third direction is located in the projection of the corresponding battery monomer row along the third direction, so that each first straight pipe segment is in sufficient contact with the corresponding battery monomer row, and the heat exchange of the first straight pipe segment can be fully utilized to regulate the temperature of the battery monomer, and the heat exchange efficiency of the first straight pipe segment is improved.

[0048] In some embodiments, each battery monomer row in at least part of the battery monomer rows corresponds to a plurality of first straight pipe segments.

[0049] In the technical solution, each battery monomer row in at least part of the battery monomer rows corresponds to a plurality of first straight pipe segments, so that the plurality of first straight pipe segments perform heat exchange with the single battery monomer row, and the temperature regulation efficiency of the single battery monomer row is improved.

[0050] In some embodiments, the number of the first straight pipe segments corresponding to each battery monomer row in at least part of the battery monomer rows is the same.

[0051] In the technical solution, the number of the first straight pipe sections corresponding to each battery monomer row in at least part of the battery monomer rows is the same, so that the heat exchange of at least part of the battery monomer rows is more uniform, and the temperature adjustment of different battery monomer rows is more uniform.

[0052] In some embodiments, all the first straight pipe sections and all the first elbow pipe sections in a single heat exchange flow channel part constitute a bending body, the heat exchange unit is multiple, the bending bodies of the multiple heat exchange units are arranged along the first direction, and different bending bodies are used for heat exchange with different battery monomer rows.

[0053] In the technical solution, the heat exchange unit is multiple, the heat exchange area of the heat exchange assembly can be increased, the bending bodies of the multiple heat exchange units are arranged along the first direction in sequence, the arrangement density of the multiple heat exchange units can be increased, the arrangement density of the pipelines of the entire heat exchange assembly is high, the heat exchange area of the heat exchange assembly is better improved, and the heat exchange efficiency of the heat exchange assembly for the battery monomer assembly can be better improved; and different bending bodies are used for heat exchange with different battery monomer rows, so that different battery monomer rows are effectively and uniformly heat exchanged.

[0054] In some embodiments, at least one heat exchange unit satisfies a relationship W=(N*A-B) / (X*N+(X*N-1)*(2k-1)), N is the total number of the battery monomer rows, the number of the first straight pipe sections corresponding to each battery monomer row is the same and is X, A is the size of a single battery monomer row in the first direction, the two sides of the bending body along the first direction are a first side and a second side, the two side edges of the battery monomer row heat-exchanged with the same bending body along the first direction are a first side edge and a second side edge, the bending body is located between the first side edge and the second side edge, the first side is adjacent to the first side edge and the distance between the first side and the first side edge in the first direction is B1, the second side is adjacent to the second side edge and the distance between the second side and the second side edge in the first direction is B2, and B is the sum of B1 and B2.

[0055] In the technical solution, at least one heat exchange unit satisfies the formula W=(N*A-B) / (X*N+(X*N-1)*(2k-1)), which can be used as a bending selection design parameter constraint. When the heat exchange unit is processed and bent, the selection model can be input according to the requirement, so that the processing and bending process selection of heat exchange units of different specifications and sizes is more convenient.

[0056] In some embodiments, the width W of the heat exchange flow channel part is greater than the thickness t of the battery monomer.

[0057] In the technical solution, the width W of the heat exchange flow channel part is greater than the thickness t of the battery monomer, so that the width of the heat exchange flow channel part is large, the heat exchange area of the heat exchange flow channel part is increased, and the heat exchange efficiency of the heat exchange assembly on the battery monomer assembly is improved.

[0058] In some embodiments, the ratio of the width W of the heat exchange flow channel part to the thickness t of the battery monomer is less than 2.

[0059] In the technical solution, the width W of the heat exchange flow channel part is greater than the thickness t of the battery monomer, so that the width of the heat exchange flow channel part is large, the heat exchange area of the heat exchange flow channel part is increased, and the heat exchange efficiency of the heat exchange assembly on the battery monomer assembly is improved.

[0060] In some embodiments, the heat exchange flow channel part is formed as a heat exchange flat tube, the thickness direction of the heat exchange flow channel part is consistent with the third direction, and at least one side surface in the thickness direction of the heat exchange flow channel part is in thermal contact or thermal connection with the battery monomer assembly.

[0061] In the technical solution, the heat exchange flow channel part is set as a heat exchange flat tube, and at least one side surface in the thickness direction of the heat exchange flow channel part is in thermal contact or thermal connection with the battery monomer assembly, so that the heat conduction area of the heat exchange flow channel part and the battery monomer assembly is increased, and the heat exchange efficiency of the heat exchange unit on the battery monomer assembly is improved.

[0062] In some embodiments, the surface of the heat exchange flow channel part in thermal contact or thermal connection with the battery monomer assembly is a heat exchange surface, and the heat exchange surface is a plane.

[0063] In the technical solution, the heat exchange surface of the heat exchange flow channel part is set as a plane, so that the heat exchange flow channel part is better attached to the battery monomer, the heat conduction area of the heat exchange flow channel part and the battery monomer assembly is increased, and the heat exchange efficiency of the heat exchange unit on the battery monomer assembly is improved.

[0064] In some embodiments, the heat exchange assembly is arranged on at least one side of the battery monomer assembly along the third direction.

[0065] In the technical solution, the heat exchange assembly is arranged on at least one side of the battery monomer assembly along the third direction, so that the overall layout of the heat exchange assembly and the battery monomer assembly is compact.

[0066] In some embodiments, the sum of the projection areas of all the heat exchange units along the third direction is a first projection area, the sum of the projection areas of all the battery cells along the third direction is a second projection area, and the ratio of the first projection area to the second projection area is greater than 1 / 3.

[0067] In the above technical solution, by making the ratio of the sum of the projection areas of all the heat exchange units along the third direction to the sum of the projection areas of all the battery cells along the third direction greater than 1 / 3, the heat conduction area between the heat exchange units and the battery cell assembly can be made larger, and the heat exchange efficiency of the heat exchange assembly on the battery cell assembly is higher.

[0068] In some embodiments, the heat exchange flow channel is provided with one or more flow dividing ribs arranged along the width direction of the heat exchange flow channel portion and spaced apart.

[0069] In the above technical solution, by arranging the flow dividing ribs extending along the extension direction of the heat exchange flow channel portion in the heat exchange flow channel, the flow area of the heat exchange flow channel can be divided to achieve a smaller flow area, which is beneficial to improve the heat exchange effect of the heat exchange flow channel portion on the battery cell assembly; and the structural strength of the heat exchange flow channel portion can be improved.

[0070] In some embodiments, the flow dividing ribs divide the heat exchange flow channel into a plurality of sub-flow channels arranged side by side and isolated from each other, and the plurality of sub-flow channels are arranged along the width direction of the heat exchange flow channel portion.

[0071] In the above technical solution, by arranging the flow dividing ribs in the heat exchange flow channel to divide the heat exchange flow channel into a plurality of sub-flow channels arranged side by side and isolated from each other, the heat exchange medium in the heat exchange flow channel can flow along the plurality of sub-flow channels with smaller flow areas, which can further improve the heat exchange effect of the heat exchange flow channel portion on the battery cell assembly; and the structural strength of the heat exchange flow channel portion can be further improved.

[0072] In some embodiments, the heat exchange flow channel portion is formed as a heat exchange flat tube, and the ratio of the thickness dimension of the flow dividing rib in the width direction of the heat exchange flow channel portion to the wall thickness of the heat exchange flat tube is 0.7-1.2.

[0073] In the above technical solution, by arranging the heat exchange flow channel portion as a heat exchange flat tube, the heat conduction area of the heat exchange flow channel portion on the battery cell assembly can be increased, and the heat exchange efficiency of the heat exchange unit on the battery cell assembly can be improved; and by making the ratio of the thickness dimension of the flow dividing rib in the width direction of the heat exchange flow channel portion to the wall thickness of the heat exchange flat tube be 0.7-1.2, the flow dividing rib can have higher structural strength, and the flow dividing rib can also occupy less space in the heat exchange flow channel.

[0074] In some embodiments, the heat exchange units are multiple, and the multiple heat exchange units are arranged in parallel.

[0075] In the above technical solution, by arranging the heat exchange units as multiple units arranged in parallel, the temperature of the heat exchange medium flowing in the heat exchange flow passage part of each heat exchange unit is relatively consistent, and the heat exchange effect of each heat exchange unit is relatively strong.

[0076] In some embodiments, the heat exchange assembly comprises an inlet and outlet structure having an inlet port and an outlet port, each of the heat exchange units is connected with the inlet and outlet structure, the heat exchange assembly has a first end and a second end arranged opposite in a first direction, and the inlet and outlet structure is located at the first end.

[0077] In the above technical solution, by arranging the inlet and outlet structure of the heat exchange assembly at one end of the heat exchange assembly in the first direction, the inlet and outlet structure on the heat exchange assembly is facilitated to be connected with external related components.

[0078] In some embodiments, the ratio of the extension lengths of the heat exchange flow passage parts of any two heat exchange units is 0.8-1.2.

[0079] In the above technical solution, by making the extension lengths of the heat exchange flow passage parts of multiple heat exchange units close to each other, the heat exchange capacity of each heat exchange unit is equivalent, the heat exchange is relatively uniform, and the overall heat exchange capacity of the heat exchange assembly is relatively strong.

[0080] In some embodiments, the heat exchange assembly is arranged in the box.

[0081] In the above technical solution, by arranging the heat exchange assembly in the box, the heat exchange assembly is facilitated to be in better heat conduction contact with the battery monomer assembly, the thermal resistance between the heat exchange assembly and the battery monomer assembly is reduced, and the heat exchange efficiency is improved.

[0082] In some embodiments, the inner wall of the box is formed with a receiving groove, the shape of the receiving groove is matched with the shape of the heat exchange unit, and the heat exchange unit is arranged in the receiving groove.

[0083] In the above technical solution, by arranging the receiving groove for arranging the heat exchange unit on the inner wall of the box, the installation and positioning of the unit are facilitated.

[0084] In some embodiments, the inner wall of the box is formed with multiple ribs, and the multiple ribs cooperatively define the receiving groove.

[0085] In the above technical solution, by forming multiple ribs on the inner wall of the box and cooperatively defining the receiving groove by the multiple ribs, the forming process of the receiving groove is facilitated, and the multiple ribs can improve the structural strength of the box.

[0086] In some embodiments, the part of the box body protrudes inward to form a plurality of the ribs.

[0087] In the above technical solution, by making the part of the box body protrude inward to form a plurality of ribs, the processing of the ribs is facilitated, and the structural strength of the box body is improved by the plurality of ribs without increasing the weight of the box body.

[0088] In some embodiments, the box body comprises a bottom plate, and the heat exchange assembly is mounted on the bottom plate.

[0089] In the above technical solution, by arranging the heat exchange assembly on the bottom plate of the box body, the heat exchange assembly is arranged at a lower position in the box body, facilitating the installation and fixation of the heat exchange assembly, and the center of gravity of the battery device is lower, which is more stable and reliable.

[0090] In some embodiments, the bottom plate is provided with a mounting beam, the mounting beam is arranged on opposite sides of the heat exchange assembly along a second direction and extends along a first direction, the battery monomer assembly is connected with the mounting beam, and the second direction intersects the first direction.

[0091] In the above technical solution, by arranging the mounting beam on the bottom plate, the battery monomer assembly is facilitated to be mounted and fixed on the bottom plate.

[0092] In some embodiments, the ratio of the size of the box body in the first direction to the size of the box body in the second direction is greater than 2, and the second direction intersects the first direction.

[0093] In the above technical solution, by making the size of the box body of the battery device in the first direction significantly greater than the size of the box body in the second direction, the battery device as a whole can be approximately rectangular, and when the battery device is applied to a vehicle, the first direction of the box body can be placed along the longitudinal direction of the vehicle, the longitudinal space of the vehicle can be fully utilized, and the capacity of the battery device is improved.

[0094] In some embodiments, the ratio of the size of the box body in the third direction to the size of the box body in the second direction is less than 0.3, and the third direction intersects the second direction.

[0095] In the technical solution, the size of the box in the up-down direction is small, so that the battery device is flat, and when the battery device is used in a vehicle, the battery device occupies less space in the Z direction of the vehicle, which is beneficial to the layout of other components in the vehicle. When the battery device is installed at the bottom of the vehicle, the bottom of the battery device is not too low to be easily damaged by scratching, and the risk of damage to the battery device by scratching is reduced during driving of the vehicle.

[0096] In a second aspect, the application provides a battery device, comprising the battery device of the first aspect.

[0097] In the technical solution, the heat exchange assembly of the battery device has high temperature regulation efficiency on the battery monomer assembly, and is beneficial to the lightweight requirement of the battery device.

[0098] In some embodiments, the electric device is a vehicle, and the longitudinal direction of the vehicle is the first direction.

[0099] In the technical solution, when the battery device is used in a vehicle and the longitudinal direction of the vehicle is the first direction, the heat exchange assembly of the battery device has high temperature regulation efficiency on the battery monomer assembly and is beneficial to the lightweight requirement of the battery device, which improves the safety of the vehicle during driving. When the length direction of the battery device is placed along the longitudinal direction of the vehicle, the longitudinal space of the vehicle can be fully utilized, which is beneficial to improving the capacity of the battery device.

[0100] Additional aspects and advantages of the application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0101] The above and / or additional aspects and advantages of the application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0102] Figure 1 is a schematic diagram of a battery device according to some embodiments of the application;

[0103] Figure 2 is an exploded view of a battery device according to embodiments of the application;

[0104] Figure 3 is another angle of an exploded view of a battery device according to embodiments of the application;

[0105] Figure 4 is a schematic diagram of the inside of a battery device according to embodiments of the application;

[0106] Figure 5 is a schematic view of a cooperation of a heat exchange assembly and a battery cell assembly according to an embodiment of the present application;

[0107] Figure 6 is a front view of a heat exchange assembly according to an embodiment of the present application;

[0108] Figure 7 is a sectional view along line G-G in Figure 6

[0109] Figure 8 is an enlarged view of a portion H in Figure 7

[0110] Figure 9 is a schematic view of an electric device according to some embodiments of the present application.

[0111] Reference Signs:

[0112] 1000, electric device;

[0113] 100, battery device;

[0114] 10, box body; 11, bottom plate; 111, convex rib; 112, accommodating groove; 12, mounting beam; 13, top cover;

[0115] 20, battery cell assembly;

[0116] 30, battery cell row; 301, battery cell; 31, first side edge; 32, second side edge;

[0117] 50, heat exchange assembly;

[0118] 5, heat exchange unit; 5a, heat exchange flow passage part; 51a, heat exchange flow passage; 511a, sub flow passage; 5b, flow dividing rib; 51, straight pipe section; 511, first straight pipe section; 512, second straight pipe section; 513, third straight pipe section; 514, fourth straight pipe section; 52, elbow pipe section; 521, first elbow pipe section; 522, second elbow pipe section; 523, third elbow pipe section; 524, fourth elbow pipe section; 53, bending body; 531, first side edge; 532, second side edge; 54, heat exchange surface;

[0119] 501, first heat exchange unit; 502, second heat exchange unit;

[0120] 60, liquid inlet and outlet structure; 6, current collecting piece; 61, liquid inlet; 62, liquid outlet; 63, liquid outlet cavity;

[0121] 200, vehicle body. DETAILED DESCRIPTION

[0122] ​​In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0123] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0124] In the present application, the term "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments.

[0125] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0126] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0127] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0128] "plurality" appearing in the present application refers to two or more (including two).

[0129] In the embodiments of the present application, all the embodiments and optional embodiments of the present application can be combined with each other to form new technical solutions if no special instructions are given.

[0130] In the embodiments of the present application, all the technical features and optional technical features of the present application can be combined with each other to form new technical solutions if no special instructions are given.

[0131] In the embodiments of the present application, the battery apparatus can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component. For example, the battery cell assembly is usually formed by arranging a plurality of battery cells; the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0132] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging; the battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., which are not limited in the embodiments of the present application. The battery cell can be a flat body, a cuboid, etc.

[0133] The battery apparatus can be a battery pack, which includes a box body and one or more battery cell assemblies accommodated in the box body. The battery cell assembly can be a battery module, which can be accommodated in the box body by fixing the battery module in the box body; the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0134] In the embodiments of the present application, the box body can include a first box body and a second box body. The first box body and the second box body are buckled to form a closed space inside the box body to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first box body can be a top cover or a bottom plate. For example, the box body can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0135] In embodiments of the present application, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beams and longitudinal beams of the vehicle.

[0136] The technical solutions described in the embodiments of the present application are applicable to various battery monomer using electric devices, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc., such as spacecraft including airplanes, rockets, space shuttles and spaceships, etc.

[0137] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment and aerospace and other fields. With the continuous expansion of the application field of power battery, the market demand is also increasing.

[0138] In the related art, the weight is large, which leads to low heat exchange efficiency per unit mass, so that the weight of the whole battery device is large, which is not conducive to the lightweight demand of the battery device. Therefore, how to balance the heat exchange efficiency of the heat exchange assembly and the lightweight demand is a technical problem to be solved.

[0139] Based on this, the present application provides a battery device, the battery device comprises: a box, a battery monomer assembly and a heat exchange assembly, the battery monomer assembly is arranged in the box, and the battery monomer assembly comprises a plurality of battery monomers, the heat exchange assembly is used for heat exchange with the battery monomer, and the heat exchange assembly comprises at least one heat exchange unit, the heat exchange unit has a heat exchange flow channel part, the heat exchange flow channel part has a heat exchange flow channel for conducting heat exchange medium, the heat exchange flow channel part comprises a straight pipe section extending along a straight line and a bent pipe section extending along an arc, in the extension direction of the heat exchange unit, the adjacent two straight pipe sections are connected with the bent pipe section, the ratio of the bending radius R of the bent pipe section to the width W of the heat exchange flow channel part is k, and k is greater than 0.5.

[0140] In the battery device, the heat exchange assembly for adjusting the temperature of the battery monomer is provided to include at least one heat exchange unit, the heat exchange flow channel part of the heat exchange unit is provided to include a straight pipe section and a bent pipe section, the heat exchange flow channel part is bent and extended, at least part of the heat exchange unit is provided to be a bent heat exchange pipe structure, the heat exchange flow channel part of the heat exchange unit is arranged compactly, the heat exchange unit has a large pipe arrangement density per unit area, the heat exchange area of the heat exchange unit and the battery monomer assembly can be increased, the heat exchange capacity of the heat exchange assembly per unit area can be improved, the temperature adjustment efficiency of the heat exchange assembly on the battery monomer assembly is improved, and the overall mass of the heat exchange pipe structure is light, which is beneficial to the light weight of the battery device and the heat exchange efficiency per unit mass of the heat exchange assembly. In addition, by making the ratio of the bending radius of the bent pipe section to the width of the heat exchange flow channel part greater than 0.5, the heat exchange flow channel part is bent and formed during the processing of the bent heat exchange unit.

[0141] The vehicle disclosed by the embodiments of the present application can be a new energy vehicle, which can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle. The vehicle is internally provided with a battery device, which can be arranged at the bottom of the vehicle. The battery device can be used for power supply of the vehicle, for example, can be used as a driving power source of the vehicle, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle. The battery device can not only be used as a driving power source of the vehicle, but also be used as an operating power source of the vehicle. The vehicle can further include a controller and a motor, and the controller is used to control the battery device to supply power to the motor, for example, to meet the power demand of the vehicle during starting, navigation and driving.

[0142] Reference will be made to Figures 1-8 A battery device 100 according to embodiments of the present application is described.

[0143] Reference is made to Figures 1-5 In a first aspect, the embodiments of the present application provide a battery device 100, which includes a box body 10, a battery monomer assembly 20 and a heat exchange assembly 50. The battery monomer assembly 20 is arranged in the box body 10, and the battery monomer assembly 20 includes a plurality of battery monomers 301. The heat exchange assembly 50 is used for heat exchange with the battery monomers 301, and the heat exchange assembly 50 includes at least one heat exchange unit 5. The heat exchange unit 5 has a heat exchange flow channel part 5a, the heat exchange flow channel part 5a has a heat exchange flow channel 51a for conducting a heat exchange medium, the heat exchange flow channel part 5a includes a straight pipe section 51 extending along a straight line and a bent pipe section 52 extending along an arc line. In the extension direction of the heat exchange unit 5, two adjacent straight pipe sections 51 are connected by the bent pipe section 52. The ratio of the bending radius R of the bent pipe section 52 to the width W of the heat exchange flow channel part 5a is k, and k is greater than 0.5.

[0144] The heat exchange flow channel part 5a can be a tubular structure.

[0145] The heat exchange component 50 is used to exchange heat with the battery monomer 301, which can be understood as that the heat exchange component 50 and the battery monomer 301 have a heat conduction relationship, for example, the heat exchange component 50 and the battery monomer 301 are in heat conduction contact or heat conduction connection, so as to realize the heat exchange between the heat exchange component 50 and the battery monomer 301. The heat exchange component 50 can be used to increase the temperature of the battery monomer 301, and the heat exchange component 50 can also be used to reduce the temperature of the battery monomer 301, which can be determined according to the ambient temperature of the battery device 100 and the temperature of the battery device 100 itself.

[0146] The heat exchange medium can be one or more of liquid, solid and gas, for example, the heat exchange medium can include water or a mixture of water and other liquids. During the flow of the heat exchange medium along the heat exchange flow channel 51a, the heat exchange medium can take away the heat generated by the battery monomer 301 or the heat exchange medium can heat the battery monomer 301.

[0147] The bending radius R of the bent pipe section 52 refers to the curvature radius of the circular arc where the center line s of the bent pipe section 52 is located. The center line s of the bent pipe section 52 refers to the center line located at the middle position of the bent pipe section 52 in the width direction of the bent pipe section 52, and the center line s of the bent pipe section 52 extends along the extension direction of the bent pipe section 52. For example, the bent pipe section 52 is formed as an arc section, and the center line s of the bent pipe section 52 is an arc line.

[0148] The center line of the straight pipe section 51 extends along a straight line, and the center line of the straight pipe section 51 refers to the center line located at the middle position of the straight pipe section 51 in the width direction of the straight pipe section 51.

[0149] The width direction of the heat exchange flow channel part 5a, the extension direction of the heat exchange flow channel part 5a and the thickness direction of the heat exchange flow channel part 5a are perpendicular to each other, and the battery monomer 301 can be in heat conduction connection or heat conduction contact with at least one side of the thickness direction of the heat exchange flow channel part 5a. The extension direction of the heat exchange flow channel part 5a can be understood as the extension direction of the heat exchange flow channel 51a, and the heat exchange medium flows along the extension direction of the heat exchange flow channel 51a in the heat exchange flow channel part 5a.

[0150] In the technical scheme, the heat exchange assembly 50 for adjusting the temperature of the battery monomer 301 is arranged to include at least one heat exchange unit 5, the heat exchange flow channel part 5a of the heat exchange unit 5 is arranged to include a straight pipe section 51 and a bent pipe section 52, the heat exchange flow channel part 5a is bent and extended, at least part of the heat exchange unit 5 is arranged as a bent heat exchange pipe structure, the heat exchange flow channel part 5a of the heat exchange unit 5 is arranged compactly, the pipe arrangement density of the heat exchange unit 5 per unit area is large, the heat exchange area of the heat exchange unit 5 and the battery monomer assembly 20 can be increased, thereby the heat exchange capacity of the heat exchange assembly 50 per unit area can be improved, the temperature adjustment efficiency of the heat exchange assembly 50 on the battery monomer assembly 20 is improved, the overall quality of the heat exchange pipe structure is light, which is beneficial to realize the light weight of the battery device 100 and improve the heat exchange efficiency per unit mass of the heat exchange assembly 50; in addition, the heat exchange flow channel part 5a is arranged as a heat exchange pipe structure, the heat exchange flow channel 51a can be flexibly bent and arranged according to design requirements, and by making the ratio of the bending radius of the bent pipe section 52 to the width of the heat exchange flow channel part 5a greater than 0.5, the heat exchange flow channel part 5a is conveniently bent and formed in the process of processing and bending the heat exchange unit 5.

[0151] In some embodiments, k is in the range of 1.0-1.5.

[0152] For example, k can be 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, etc.

[0153] In the technical scheme, the ratio k of the bending radius of the bent pipe section 52 to the width of the heat exchange flow channel part 5a is not less than 1.0, which can reduce the process difficulty of the heat exchange unit 5 in the bending process, and the ratio k of the bending radius of the bent pipe section 52 to the width of the heat exchange flow channel part 5a is not greater than 1.5, which can make the pipe arrangement density of the heat exchange unit 5 large, thereby the heat exchange area of the heat exchange unit 5 and the battery monomer assembly 20 can be large, thereby the heat exchange capacity of the heat exchange assembly 50 per unit area can be improved, and by setting the ratio k of the bending radius of the bent pipe section 52 to the width of the heat exchange flow channel part 5a in the range of 1.0-1.5, the bending process difficulty and the heat exchange area of the heat exchange unit 5 can be better balanced, the processing difficulty of the heat exchange assembly 50 is reduced and the heat exchange area is large.

[0154] In some embodiments, with reference to Figure 5 and Figure 6The plurality of straight pipe sections 51 in the single heat exchange flow channel part 5a includes a plurality of first straight pipe sections 511 arranged in the first direction in sequence and at intervals, each first straight pipe section 511 extending in the second direction, and the plurality of elbow pipe sections 52 in the single heat exchange flow channel part 5a includes a first elbow pipe section 521 connected between the same end of two adjacent first straight pipe sections 511 in the second direction, and the orthographic projection of the first straight pipe section 511 and the first elbow pipe section 521 in the third direction is located within the orthographic projection of the battery monomer assembly 20 in the third direction, and the third direction, the second direction, and the first direction intersect each other in pairs.

[0155] The first direction can refer to the X direction in the drawings, the second direction can refer to the Y direction in the drawings, and the third direction can refer to the Z direction in the drawings. The thickness direction of the heat exchange flow channel part 5a can be consistent with the third direction.

[0156] In the above technical solution, by arranging the plurality of first straight pipe sections 511 of the single heat exchange unit 5 in the first direction and connecting the two adjacent first straight pipe sections 511 through the first elbow pipe section 521, the arrangement density of the pipe of the heat exchange unit 5 can be improved, thereby further improving the heat exchange area of the heat exchange unit 5 and the battery monomer assembly 20, and the heat exchange capacity of the heat exchange assembly 50 per unit area can be improved, and the temperature regulation efficiency of the heat exchange assembly 50 for the battery monomer assembly 20 can be further improved.

[0157] In some embodiments, referring to Figure 5 and Figure 6 The extension length L of the first straight pipe section 511 is greater than or equal to 50 mm.

[0158] For example, the extension length L of the first straight pipe section 511 is 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 90 mm, etc.

[0159] In the above technical solution, in the process of bending the heat exchange flow channel part 5a of the heat exchange unit 5 using a bending die to form the first straight pipe section 511 and the first elbow pipe section 521 connected between the two adjacent first straight pipe sections 511, the first straight pipe section 511 needs to be clamped and fixed to be bent to form the first elbow pipe section 521. By arranging the first straight pipe section 511 in the first direction with an extension length of not less than 50 mm, the first straight pipe section 511 has a longer length for clamping and fixing, which improves the clamping and fixing reliability of the first straight pipe section 511, thereby improving the bending forming quality of the heat exchange unit 5.

[0160] In some embodiments, referring to Figure 5 and Figure 6The interval d1 of the two adjacent first straight pipe sections 511 in the first direction is greater than the width W of the first straight pipe section 511 in the same heat exchange runner part 5a.

[0161] In the above technical solution, by making the interval d1 of the two adjacent first straight pipe sections 511 in the first direction greater than the width W of the first straight pipe section 511 in the same heat exchange runner part 5a, the bending process difficulty of the first bent pipe section 521 of the heat exchange unit 5 can be reduced.

[0162] In some embodiments, the ratio of the interval d1 of the two adjacent first straight pipe sections 511 in the first direction to the width W of the first straight pipe section 511 is less than 2 in the same heat exchange runner part 5a.

[0163] For example, the ratio of the interval d1 of the two adjacent first straight pipe sections 511 in the first direction to the width W of the first straight pipe section 511 is 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, etc. in the same heat exchange runner part 5a.

[0164] In the above technical solution, on the basis of making the interval d1 of the two adjacent first straight pipe sections 511 in the first direction greater than the width W of the first straight pipe section 511 in the same heat exchange runner part 5a, while making the ratio of the interval d1 of the two adjacent first straight pipe sections 511 in the first direction to the width W of the first straight pipe section 511 less than 2 in the same heat exchange runner part 5a, that is, making the ratio of the interval d1 of the two adjacent first straight pipe sections 511 in the first direction to the width W of the first straight pipe section 511 greater than 1 and less than 2, the arrangement density of the plurality of first straight pipe sections 511 along the first direction can be made larger while reducing the bending process difficulty of the first bent pipe section 521 of the heat exchange unit 5, and the heat exchange area of the heat exchange unit 5 and the battery monomer assembly 20 can be increased, so that the heat exchange capacity of the heat exchange assembly 50 per unit area can be improved, and the bending process difficulty and heat exchange efficiency of the heat exchange unit 5 can be better balanced.

[0165] In some embodiments, the ratio of the extension length of the first straight pipe section 511 to the extension length of the first bent pipe section 521 is 0.7-2.

[0166] For example, the ratio of the extension length of the first straight pipe section 511 to the extension length of the first bent pipe section 521 is 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, etc.

[0167] In the technical solution, the ratio of the extension length of the first straight pipe section 511 to the extension length of the first bent pipe section 521 is not less than 0.7, so that the extension length of the first bent pipe section 521 is relatively large, and the first bent pipe section 521 has a large bending radius, so that the bending process difficulty of the first bent pipe section 521 is reduced, and meanwhile, the ratio of the extension length of the first straight pipe section 511 to the extension length of the first bent pipe section 521 is not greater than 2, so that the extension length of the first bent pipe section 521 is appropriate, so that the spacing of the adjacent first straight pipe sections 511 in the first direction is not too large, and the ratio of the extension length of the first straight pipe section 511 to the extension length of the first bent pipe section 521 is 0.7-2, so that the bending process difficulty and the heat exchange efficiency of the heat exchange unit 5 are well balanced.

[0168] In some embodiments, referring to Figure 5 and Figure 6 all the first straight pipe sections 511 and all the first bent pipe sections 521 in a single heat exchange flow channel part 5a constitute a bent body 53, and the heat exchange unit 5 is multiple, and the bent bodies 53 of the multiple heat exchange units 5 are arranged in sequence in the first direction.

[0169] The single heat exchange unit 5 has one heat exchange flow channel part 5a, and all the first straight pipe sections 511 and all the first bent pipe sections 521 in the single heat exchange flow channel part 5a constitute a bent body 53, which can be understood as: all the first straight pipe sections 511 and all the first bent pipe sections 521 in the single heat exchange unit 5 constitute a bent body 53. In this way, each heat exchange unit 5 has one bent body 53, and multiple heat exchange units 5 have multiple bent bodies 53.

[0170] In the technical solution, the heat exchange unit 5 is provided as multiple, so that the heat exchange area of the heat exchange assembly 50 is increased, and the bent bodies 53 of the multiple heat exchange units 5 are arranged in sequence in the first direction, so that the arrangement density of the multiple heat exchange units 5 is increased, so that the arrangement density of the pipelines of the entire heat exchange assembly 50 is large, so that the heat exchange area of the heat exchange assembly 50 and the battery monomer assembly 20 is better improved, so that the heat exchange capacity of the heat exchange assembly 50 per unit area is improved, so that the heat exchange efficiency of the heat exchange assembly 50 for the battery monomer assembly 20 is better improved.

[0171] In some embodiments, referring to Figure 5 and Figure 6 the spacing of the adjacent two first straight pipe sections 511 in the same bent body 53 in the first direction is d1, the spacing of the adjacent two first straight pipe sections 511 in the first direction in the adjacent two bent bodies 53 is d2, and d2 is less than d1.

[0172] In the technical solution, the interval d2 of the two adjacent first straight pipe sections 511 in the first direction of the two adjacent bending main bodies 53 is not affected by the bending process, and by setting the interval of the two adjacent first straight pipe sections 511 in the first direction to be relatively small, the pipe arrangement density of the heat exchange assembly 50 can be increased without increasing the difficulty of the bending process, thereby increasing the heat exchange area of the heat exchange assembly 50 and the battery monomer assembly 20, and improving the heat exchange efficiency of the heat exchange assembly 50 on the battery monomer assembly 20.

[0173] In some embodiments, referring to Figure 5 and Figure 6 all the first straight pipe sections 511 and all the first bent pipe sections 521 in a single heat exchange flow channel part 5a constitute a bending main body 53, and the plurality of straight pipe sections 51 in the single heat exchange flow channel part 5a include second straight pipe sections 512, the second straight pipe sections 512 in the same heat exchange flow channel part 5a are located on at least one side of the bending main body 53 along the second direction, and the second straight pipe sections 512 extend along the first direction and are connected to the first straight pipe sections 511 in the same heat exchange flow channel part 5a.

[0174] In the technical solution, by arranging the second straight pipe sections 512 in the same heat exchange flow channel part 5a on at least one side of the bending main body 53 along the second direction, the pipe arrangement density of the single heat exchange flow channel part 5a can be improved, the heat exchange area of the heat exchange unit 5 and the battery monomer assembly 20 can be increased, and the heat exchange capacity of the heat exchange assembly 50 per unit area can be improved, thereby better improving the heat exchange efficiency of the heat exchange assembly 50 on the battery monomer assembly 20.

[0175] In some embodiments, referring to Figure 5 and Figure 6 the minimum interval d3 of the first bent pipe section 521 and the second straight pipe section 512 in the same heat exchange flow channel part 5a in the second direction is greater than or equal to 20 mm.

[0176] For example, the minimum interval d3 of the first bent pipe section 521 and the second straight pipe section 512 in the same heat exchange flow channel part 5a in the second direction is 20 mm, 22 mm, 24 mm, 26 mm, 28 mm, 30 mm, etc.

[0177] In the technical solution, the minimum distance d3 between the first elbow section 521 and the second straight section 512 in the same heat exchange runner part 5a is not less than 20 mm, so that the second straight section 512 and the first elbow section 521 have a larger distance, which can reduce the risk of interference between the second straight section 512 and the first elbow section 521 during the bending process of the heat exchange runner part 5a by the bending die, and can reduce the bending process difficulty of the heat exchange runner part 5a while improving the arrangement density of the heat exchange runner part 5a to improve the heat exchange efficiency.

[0178] In some embodiments, with reference to Figure 5 and Figure 6 The plurality of elbow sections 52 in the single heat exchange runner part 5a includes a second elbow section 522, and the second elbow section 522 connects the first straight section 511 and the second straight section 512 in the same heat exchange runner part 5a.

[0179] In the technical solution, the first straight section 511 and the second straight section 512 in the same heat exchange runner part 5a are connected by the second elbow section 522, so that the pipe arrangement density of the heat exchange runner part 5a is larger, the heat exchange area of the heat exchange runner part 5a is larger, and the heat exchange area of the heat exchange unit 5 and the battery monomer assembly 20 is larger, so that the heat exchange capacity of the heat exchange assembly 50 per unit area can be improved, and the heat exchange efficiency of the heat exchange assembly 50 for the battery monomer assembly 20 can be better improved.

[0180] In some embodiments, with reference to Figure 5 and Figure 6, all the first straight pipe sections 511 and all the first elbow pipe sections 521 in the single heat exchange flow channel part 5a constitute a bending main body 53, the heat exchange unit 5 is two, the bending main bodies 53 of the two heat exchange units 5 are arranged along the first direction, and the two heat exchange units 5 are respectively a first heat exchange unit 501 and a second heat exchange unit 502; wherein the first heat exchange unit 501 comprises one second straight pipe section 512, the second straight pipe section 512 of the first heat exchange unit 501 is located on one side of the bending main body 53 of the first heat exchange unit 501 along the second direction, the second heat exchange unit 502 comprises two second straight pipe sections 512, the two second straight pipe sections 512 of the second heat exchange unit 502 are located on both sides of the bending main body 53 of the second heat exchange unit 502 along the second direction, the bending main body 53 has opposite first and second sides in the second direction, the second straight pipe section 512 of the first heat exchange unit 501 and one of the second straight pipe sections 512 of the second heat exchange unit 502 are both located on the first side of the bending main body 53 in the second direction, the second straight pipe section 512 of the first heat exchange unit 501 and the second straight pipe section 512 of the second heat exchange unit 502 located on the first side of the bending main body 53 in the second direction are arranged along the first direction, the other second straight pipe section 512 of the second heat exchange unit 502 is located on the second side of the bending main body 53 in the second direction, and the other second straight pipe section 512 of the second heat exchange unit 502 extends to the side of the bending main body 53 of the first heat exchange unit 501 along the second direction.

[0181] In the above technical solution, the heat exchange unit 5 is provided as two, which can increase the heat exchange area of the heat exchange assembly 50, and the bending main bodies 53 of the two heat exchange units 5 are arranged along the first direction in sequence, which can increase the arrangement density of the two heat exchange units 5, so that the arrangement density of the pipelines of the entire heat exchange assembly 50 is relatively large, and the heat exchange area of the heat exchange assembly 50 is better improved, so that the heat exchange efficiency of the heat exchange assembly 50 on the battery monomer assembly 20 can be better improved; and by reasonably arranging the second straight pipe section 512 of the first heat exchange unit 501 and the second straight pipe section 512 of the second heat exchange unit 502 on the opposite sides of the bending main body 53 along the second direction, the pipeline arrangement density of the heat exchange assembly 50 can be further improved, the heat exchange area of the heat exchange assembly 50 can be increased, so that the heat exchange area of the heat exchange assembly 50 on the battery monomer assembly 20 can be increased, the heat exchange capacity of the heat exchange assembly 50 per unit area can be increased, and the heat exchange efficiency of the heat exchange assembly 50 on the battery monomer assembly 20 can be better improved.

[0182] In some embodiments, reference is made to Figure 5 and Figure 6The minimum distance d3 in the second direction between the first elbow section 521 and the second straight section 512 in the same heat exchange channel section 5a, and the minimum distance d4 in the second direction between the second straight section 512 on the second side of the bending body 53 in the second heat exchange unit 502 and the first elbow section 521 in the first heat exchange unit 501, d4 is less than d3.

[0183] In the above technical solution, by utilizing the feature that the distance between the first elbow section 521 and the second straight section 512 of different heat exchange units 5 is not limited by the bending process, the distance between the first elbow section 521 and the second straight section 512 of different heat exchange units 5 is set to be smaller, which can increase the pipe arrangement density of the heat exchange assembly 50, thereby increasing the heat exchange area of the heat exchange assembly 50, and thus improving the heat exchange area of the heat exchange assembly 50 and the battery monomer assembly 20, thereby improving the heat exchange capacity of the heat exchange assembly 50 per unit area, and thus better improving the heat exchange efficiency of the heat exchange assembly 50 for the battery monomer assembly 20.

[0184] In some embodiments, referring to Figure 5 and Figure 6 The plurality of straight sections 51 in the second heat exchange unit 502 further include a third straight section 513 and a fourth straight section 514. In the first direction, the third straight section 513 is located on the side of the bending body 53 in the second heat exchange unit 502 away from the bending body 53 in the first heat exchange unit 501, and the third straight section 513 extends in the second direction. In the second direction, the fourth straight section 514 is arranged on the side of the second straight section 512 on the second side away from the bending body 53, and the fourth straight section 514 extends in the first direction. The third straight section 513 is connected between the second straight section 512 and the fourth straight section 514 of the second heat exchange unit 502.

[0185] In the above technical solution, by making the second heat exchange unit 502 include the third straight section 513 and the fourth straight section 514, and making the bending bodies 53 of the two heat exchange units 5 located in the space surrounded by the first straight section 511, the second straight section 512, the third straight section 513, and the fourth straight section 514 of the two heat exchange units 5, an outer package structure is formed, which can make the arrangement of the two heat exchange units 5 compact, improve the heat exchange area of the heat exchange assembly 50, and thus improve the heat exchange area of the heat exchange assembly 50 and the battery monomer assembly 20, thereby improving the heat exchange capacity of the heat exchange assembly 50 per unit area, and thus better improving the heat exchange efficiency of the heat exchange assembly 50 for the battery monomer assembly 20.

[0186] In some embodiments, referring to Figure 5 and Figure 6The plurality of bent pipe sections 52 in the second heat exchange unit 502 further include a third bent pipe section 523 and a fourth bent pipe section 524. The third bent pipe section 523 is connected between the second straight pipe section 512 and a third straight pipe section 513 of the second heat exchange unit 502, and the fourth bent pipe section 524 is connected between the third straight pipe section 513 and a fourth straight pipe section 514 of the second heat exchange unit 502.

[0187] In the above technical solution, by connecting the second straight pipe section 512 and the third straight pipe section 513 of the second heat exchange unit 502 and the third straight pipe section 513 and the fourth straight pipe section 514 through the bent pipe sections 52, the pipe arrangement density of the heat exchange assembly 50 can be increased, the heat exchange area of the heat exchange flow channel part 5a can be increased, the heat exchange area between the heat exchange assembly 50 and the battery monomer assembly 20 can be increased, the heat exchange capacity of the heat exchange assembly 50 per unit area can be increased, and the heat exchange efficiency of the heat exchange assembly 50 on the battery monomer assembly 20 can be improved.

[0188] In some embodiments, referring to Figure 5 and Figure 6 , the distance between the third straight pipe section 513 and the nearest first straight pipe section 511 in the first heat exchange unit 501 in the first direction is d5, and the ratio of d5 to d1 is 0.7-1.5.

[0189] For example, the ratio of d5 to d1 is 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, etc.

[0190] In the above technical solution, the third straight pipe section 513 of the second heat exchange unit 502 and the plurality of first straight pipe sections 511 of the two heat exchange units 5 are arranged in the first direction, and by setting the ratio of the distance d5 between the third straight pipe section 513 and the nearest first straight pipe section 511 in the first heat exchange unit 501 to the distance d1 between the two adjacent first straight pipe sections 511 in the same heat exchange flow channel part 5a in the first direction to be 0.7-1.5, the distance between the straight pipe sections 51 arranged in the first direction can be uniform, and the temperature regulation of the heat exchange assembly 50 on the battery monomer 301 can be uniform.

[0191] In some embodiments, referring to Figure 5 and Figure 6 , the distance between the fourth straight pipe section 514 and the second straight pipe section 512 on the second side in the second direction is d6, the thickness direction of the battery monomer 301 is consistent with the second direction, the thickness of the battery monomer 301 is t, and d6 is less than t.

[0192] For example, the shape of the outer shape of the battery cell 301 can be a cuboid, and the thickness direction of the battery cell 301 refers to the direction in which the smallest dimension among the three dimensions of length, width, and height of the battery cell 301 is located.

[0193] In the technical solution described above, by making the spacing d6 between the fourth straight pipe section 514 and the adjacent second straight pipe section 512 in the second direction smaller than the thickness dimension t of the battery cell 301 in the second direction, the spacing between the fourth straight pipe section 514 and the adjacent second straight pipe section 512 in the second direction is smaller, which can avoid the situation that a single battery cell 301 is completely opposite to the gap between the fourth straight pipe section 514 and the adjacent second straight pipe section 512 and cannot achieve effective heat exchange, so that the battery cell 301 opposite to the gap between the fourth straight pipe section 514 and the adjacent second straight pipe section 512 can be in heat-conducting contact with the heat exchange flow channel part 5a to be effectively temperature-regulated.

[0194] In some embodiments, the ratio of d6 to t is 0.3-0.8.

[0195] For example, the ratio of d6 to t is 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0196] In the technical solution described above, by making the ratio of the spacing d6 between the fourth straight pipe section 514 and the adjacent second straight pipe section 512 in the second direction to the thickness dimension t of the battery cell 301 in the second direction range from 0.3 to 0.8, the battery cell 301 opposite to the gap between the fourth straight pipe section 514 and the adjacent second straight pipe section 512 can be in heat-conducting contact with the heat exchange flow channel part 5a to be effectively temperature-regulated, while the arrangement of the two heat exchange units 5 can be facilitated and the arrangement difficulty can be reduced.

[0197] In some embodiments, with reference to Figure 4 and Figure 5 The battery cell assembly 20 includes one or more battery cell rows 30 arranged along the first direction, and each battery cell row 30 includes a plurality of battery cells 301 arranged along the second direction.

[0198] In the technical solution, the battery monomer assembly 20 is arranged to include one or more battery monomer rows 30 arranged along a first direction, and each battery monomer row 30 includes a plurality of battery monomers 301 arranged along a second direction, so that the plurality of battery monomer rows 30 in the battery monomer assembly 20 are orderly and compact, and the capacity of the battery device 100 is improved; and the arrangement direction of the plurality of battery monomers 301 in each battery monomer row 30 intersects with the extension direction of the first straight pipe segment 511, so that each first straight pipe segment 511 can be in heat-conducting contact with the plurality of battery monomers 301 in the single battery monomer row 30 as much as possible, so that the single first straight pipe segment 511 can exchange heat with the plurality of battery monomers 301 in the battery monomer row 30, the heat exchange efficiency can be improved, and the heat exchange of the plurality of battery monomers 301 in the battery monomer row 30 can be more uniform.

[0199] In some embodiments, the projection of the first straight pipe segment 511 along the third direction is located in the projection of the battery monomer row 30 along the third direction.

[0200] In the technical solution, the projection of the first straight pipe segment 511 along the third direction is located in the projection of the battery monomer row 30 along the third direction, so that the first straight pipe segment 511 can be in sufficient contact with the battery monomer row 30, and the heat exchange of the first straight pipe segment 511 can be fully utilized to regulate the temperature of the battery monomer 301, and the heat exchange efficiency of the first straight pipe segment 511 is improved.

[0201] In some embodiments, referring to Figure 5 each battery monomer row 30 corresponds to at least one first straight pipe segment 511, and the projection of the first straight pipe segment 511 corresponding to each battery monomer row 30 along the third direction is located in the projection of the corresponding battery monomer row 30 along the third direction.

[0202] For example, each battery monomer row 30 corresponds to one first straight pipe segment 511, and the projection of the first straight pipe segment 511 along the third direction is located in the projection of the battery monomer row 30 along the third direction.

[0203] For another example, each battery monomer row 30 corresponds to two first straight pipe segments 511, and the projections of the two first straight pipe segments 511 along the third direction are located in the projection of the battery monomer row 30 along the third direction.

[0204] In the technical solution, the projection of the first straight pipe segment 511 corresponding to each battery monomer row 30 along the third direction is located in the projection of the corresponding battery monomer row 30 along the third direction, so that each first straight pipe segment 511 can be in sufficient contact with the corresponding battery monomer row 30, and the heat exchange of the first straight pipe segment 511 can be fully utilized to regulate the temperature of the battery monomer 301, and the heat exchange efficiency of the first straight pipe segment 511 is improved.

[0205] In some embodiments, referring to Figure 5 , each of at least part of the battery cell rows 30 corresponds to a plurality of first straight pipe segments 511.

[0206] Each of at least part of the battery cell rows 30 corresponding to a plurality of first straight pipe segments 511 includes, for example, a case where one battery cell row 30 corresponds to a plurality of first straight pipe segments 511, for another example, a case where each of a plurality of battery cell rows 30 corresponds to a plurality of first straight pipe segments 511, and for another example, a case where each of the battery cell rows 30 corresponds to a plurality of first straight pipe segments 511.

[0207] In the above technical solution, by making each of at least part of the battery cell rows 30 correspond to a plurality of first straight pipe segments 511, the plurality of first straight pipe segments 511 can be used for heat exchange with a single battery cell row 30, thereby improving the temperature regulation efficiency of a single battery cell row 30.

[0208] In some embodiments, referring to Figure 5 , each of at least part of the battery cell rows 30 corresponds to the same number of first straight pipe segments 511.

[0209] Each of at least part of the battery cell rows 30 corresponds to the same number of first straight pipe segments 511, including, for example, a case where each of two battery cell rows 30 corresponds to the same number of first straight pipe segments 511, and for another example, a case where each of the battery cell rows 30 corresponds to the same number of first straight pipe segments 511.

[0210] In the above technical solution, by making each of at least part of the battery cell rows 30 correspond to the same number of first straight pipe segments 511, the heat exchange of at least part of the battery cell rows 30 can be more uniform, so that the temperature regulation of different battery cell rows 30 can be more uniform.

[0211] In some embodiments, referring to Figure 5 and Figure 6 , all of the first straight pipe segments 511 and all of the first elbow pipe segments 521 in a single heat exchange flow channel part 5a constitute a bending body 53, the heat exchange unit 5 is a plurality of, the bending bodies 53 of the plurality of heat exchange units 5 are arranged in a first direction, and different bending bodies 53 are used for heat exchange with different battery cell rows 30.

[0212] Different bending main bodies 53 are used for heat exchange with different battery monomer rows 30, that is, the number of bending main bodies 53 is the same as the number of battery monomer rows 30 and each bending main body 53 is used for heat exchange with a corresponding battery monomer row 30.

[0213] In the above technical solution, the heat exchange unit 5 is provided as a plurality of units, which can increase the heat exchange area of the heat exchange assembly 50, and the bending main bodies 53 of the plurality of heat exchange units 5 are arranged in sequence along the first direction, which can increase the arrangement density of the plurality of heat exchange units 5, so that the arrangement density of the pipelines of the entire heat exchange assembly 50 is relatively large, and the heat exchange area of the heat exchange assembly 50 is better improved, so that the heat exchange efficiency of the heat exchange assembly 50 for the battery monomer assembly 20 can be better improved; and by making different bending main bodies 53 exchange heat with different battery monomer rows 30, different battery monomer rows 30 can be effectively and uniformly heat exchanged.

[0214] In some embodiments, with reference to Figure 5 , at least one heat exchange unit 5 satisfies the relationship W=(N*A-B) / (X*N+(X*N-1)*(2k-1)), N is the total number of battery monomer rows 30, the number of first straight pipe sections 511 corresponding to each battery monomer row 30 is the same and is X, A is the size of a single battery monomer row 30 in the first direction, the two sides of the bending main body 53 along the first direction are respectively the first side edge 531 and the second side edge 532, the two side edges of the battery monomer row 30 heat exchanged with the same bending main body 53 along the first direction are respectively the first side edge 31 and the second side edge 32, the bending main body 53 is located between the first side edge 31 and the second side edge 32, the first side edge 531 is adjacent to the first side edge 31 and the distance between the first side edge 531 and the first side edge 31 in the first direction is B1, the second side edge 532 is adjacent to the second side edge 32 and the distance between the second side edge 532 and the second side edge 32 in the first direction is B2, and B is the sum of B1 and B2.

[0215] In the above technical solution, by making at least one heat exchange unit 5 satisfy the formula W=(N*A-B) / (X*N+(X*N-1)*(2k-1)), the formula can be used as a bending selection design parameter constraint, and when the bending heat exchange unit 5 is processed, the selection model can be input according to the requirements, so that the processing and bending process of heat exchange units 5 of different specifications and sizes can be quickly selected.

[0216] In some embodiments, with reference to Figure 5 , the width W of the heat exchange flow channel part 5a is greater than the thickness t of the battery monomer 301.

[0217] In the technical solution, the width W of the heat exchange flow channel part 5a is greater than the thickness t of the battery monomer 301, so that the width of the heat exchange flow channel part 5a is large, the heat exchange area of the heat exchange flow channel part 5a is increased, the heat exchange area between the heat exchange assembly 50 and the battery monomer assembly 20 is increased, the heat exchange capacity of the heat exchange assembly 50 per unit area is increased, and the heat exchange efficiency of the heat exchange assembly 50 on the battery monomer assembly 20 is improved.

[0218] In some embodiments, the ratio of the width W of the heat exchange flow channel part 5a to the thickness t of the battery monomer 301 is less than 2.

[0219] For example, the ratio of the width W of the heat exchange flow channel part 5a to the thickness t of the battery monomer 301 is 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, etc.

[0220] In the technical solution, the width W of the heat exchange flow channel part 5a is greater than the thickness t of the battery monomer 301, so that the width of the heat exchange flow channel part 5a is large, the heat exchange area of the heat exchange flow channel part 5a is increased, the heat exchange area between the heat exchange assembly 50 and the battery monomer assembly 20 is increased, the heat exchange capacity of the heat exchange assembly 50 per unit area is increased, and the heat exchange efficiency of the heat exchange assembly 50 on the battery monomer assembly 20 is improved.

[0221] In some embodiments, referring to Figures 3-5 , the heat exchange flow channel part 5a is formed as a heat exchange flat tube, the thickness direction of the heat exchange flow channel part 5a is consistent with the third direction, and at least one side surface of the heat exchange flow channel part 5a in the thickness direction is in thermal contact or thermal connection with the battery monomer assembly 20.

[0222] The cross section of the heat exchange flat tube can be rectangular.

[0223] The heat exchange flow channel part 5a is in thermal contact with the battery monomer assembly 20, which can be that the heat exchange flow channel part 5a is directly in contact with the battery monomer assembly 20.

[0224] The heat exchange flow channel part 5a is in thermal connection with the battery monomer assembly 20, which can be that the heat exchange flow channel part 5a and the battery monomer assembly 20 are in thermal connection through a heat conduction structure, for example, the heat exchange flow channel part 5a and the battery monomer assembly 20 are in thermal connection through a heat conduction adhesive layer.

[0225] In the above technical solution, by setting the heat exchange runner part 5a as a heat exchange flat tube, and by making at least one side surface of the heat exchange runner part 5a in the thickness direction in thermal contact or thermal connection with the battery monomer assembly 20, the thermal conduction area of the heat exchange runner part 5a and the battery monomer assembly 20 can be increased, and the heat exchange efficiency of the heat exchange unit 5 for the battery monomer assembly 20 can be improved.

[0226] In some embodiments, with reference to Figures 3-6 , the surface of the heat exchange runner part 5a in thermal contact or thermal connection with the battery monomer assembly 20 is the heat exchange surface 54, and the heat exchange surface 54 is a plane.

[0227] At least one side surface of the heat exchange runner part 5a in the thickness direction is formed as the heat exchange surface 54, and the heat exchange surface 54 is in thermal contact or thermal connection with the battery monomer assembly 20.

[0228] In the above technical solution, by setting the heat exchange surface 54 of the heat exchange runner part 5a as a plane, the heat exchange runner part 5a can be better attached to the battery monomer 301, the thermal conduction area of the heat exchange runner part 5a and the battery monomer assembly 20 can be increased, and the heat exchange efficiency of the heat exchange unit 5 for the battery monomer assembly 20 can be improved.

[0229] In some embodiments, with reference to Figures 3-5 , the heat exchange assembly 50 is arranged on at least one side of the battery monomer assembly 20 along the third direction.

[0230] For example, the heat exchange assembly 50 can be arranged on one side of the battery monomer assembly 20 along the third direction, and the heat exchange assembly 50 can also be arranged on both sides of the battery monomer assembly 20 along the third direction.

[0231] In the above technical solution, by arranging the heat exchange assembly 50 on at least one side of the battery monomer assembly 20 along the third direction, the overall layout of the heat exchange assembly 50 and the battery monomer assembly 20 can be compact.

[0232] In some embodiments, the total projection area of all heat exchange units 5 of the heat exchange assembly 50 along the third direction is a first projection area, the total projection area of all battery monomers 301 of the battery device 100 along the third direction is a second projection area, and the ratio of the first projection area to the second projection area is greater than 1 / 3.

[0233] For example, the ratio of the first projection area to the second projection area is 2 / 5, 1 / 2, 3 / 5, 2 / 3, 4 / 5, etc.

[0234] In the above technical solution, by making the ratio of the total projected area of ​​all heat exchange units 5 along the third direction to the total projected area of ​​all battery cells 301 along the third direction greater than 1 / 3, the heat conduction area between the heat exchange unit 5 and the battery cell assembly 20 can be larger, resulting in higher heat exchange efficiency of the heat exchange assembly 50 for the battery cell assembly 20.

[0235] In some embodiments, refer to Figure 7 and Figure 8 The heat exchange channel 51a is provided with one or more flow divider ribs 5b spaced apart along the width direction of the heat exchange channel 5a, and the flow divider ribs 5b extend along the extension direction of the heat exchange channel 5a.

[0236] Among them, the flow divider 5b can be integrally formed with the heat exchange channel section 5a.

[0237] In the above technical solution, by providing a flow divider 5b extending along the extension direction of the heat exchange channel 5a in the heat exchange channel 51a, the flow area of ​​the heat exchange channel 51a can be divided to achieve a smaller flow area, which is beneficial to improving the heat exchange effect between the heat exchange channel 5a and the battery cell assembly 20; and it can also improve the structural strength of the heat exchange channel 5a.

[0238] In some embodiments, refer to Figure 7 and Figure 8 The flow divider 5b divides the heat exchange channel 51a into multiple sub-channels 511a arranged side by side and separated from each other. The multiple sub-channels 511a are arranged along the width direction of the heat exchange channel section 5a.

[0239] In the above technical solution, by dividing the heat exchange channel 51a into multiple sub-channels 511a arranged side by side and separated from each other by the flow divider 5b provided in the heat exchange channel 51a, the heat exchange medium in the heat exchange channel 51a can flow along multiple sub-channels 511a with smaller flow areas, which can further improve the heat exchange effect between the heat exchange channel section 5a and the battery cell assembly 20; and further improve the structural strength of the heat exchange channel section 5a.

[0240] In some embodiments, refer to Figure 7 The heat exchange channel section 5a is formed as a heat exchange flat tube, and the ratio of the thickness dimension e1 of the flow divider 5b in the width direction of the heat exchange channel section 5a to the wall thickness e2 of the heat exchange flat tube is 0.7 to 1.2.

[0241] For example, the ratio of the thickness of the flow divider 5b in the width direction of the heat exchange channel 5a to the wall thickness of the heat exchange flat tube is 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0242] In the technical solution, the heat exchange flow channel part 5a is arranged as a heat exchange flat tube, so that the heat conduction area of the heat exchange flow channel part 5a and the battery monomer assembly 20 is increased, and the heat exchange efficiency of the heat exchange unit 5 on the battery monomer assembly 20 is improved; and the ratio of the thickness dimension of the flow dividing rib 5b in the width direction of the heat exchange flow channel part 5a to the wall thickness of the heat exchange flat tube is 0.7-1.2, so that the flow dividing rib 5b has high structural strength, and the flow dividing rib 5b occupies less space in the heat exchange flow channel 51a.

[0243] In some embodiments, referring to Figures 3-6 , the heat exchange unit 5 is multiple, and the multiple heat exchange units 5 are arranged in parallel.

[0244] For example, the heat exchange assembly 50 includes an inlet and outlet structure 60, the inlet and outlet structure 60 has an inlet port 61 and an outlet port 62, each heat exchange unit 5 is connected with the inlet and outlet structure 60, the inlet and outlet structure 60 has an inlet cavity and an outlet cavity 63 which are separated from each other, the inlet port 61 is communicated with the inlet cavity, the outlet port 62 is communicated with the outlet cavity 63, one end of each heat exchange unit 5 is communicated with the inlet cavity, and the other end of each heat exchange unit 5 is communicated with the outlet cavity 63. The heat exchange medium flows into the inlet cavity from the inlet port 61 of the inlet and outlet structure 60, and then flows into the heat exchange flow channel 51a of the multiple heat exchange units 5 respectively and flows along the heat exchange flow channel 51a of the multiple heat exchange units 5 respectively. After the heat exchange medium flows through the multiple heat exchange units 5 respectively, the heat exchange medium converges into the outlet cavity 63 of the inlet and outlet structure 60, and then flows out from the outlet port 62.

[0245] In the technical solution, the heat exchange unit 5 is arranged as multiple heat exchange units arranged in parallel, so that the temperature of the heat exchange medium flowing in the heat exchange flow channel part 5a of each heat exchange unit 5 is consistent, and the heat exchange effect of each heat exchange unit 5 is strong.

[0246] In some embodiments, referring to Figures 3-6 , the heat exchange assembly 50 includes an inlet and outlet structure 60, the inlet and outlet structure 60 has an inlet port 61 and an outlet port 62, each heat exchange unit 5 is connected with the inlet and outlet structure 60, the heat exchange assembly 50 has a first end and a second end which are arranged opposite along a first direction, and the inlet and outlet structure 60 is located at the first end.

[0247] For example, the inlet and outlet structure 60 includes two flow collectors 6, the two flow collectors 6 can be arranged along a second direction, one of the two flow collectors 6 has an inlet cavity and an inlet port 61 communicated with the inlet cavity, the other of the two flow collectors 6 has an outlet cavity 63 and an outlet port 62 communicated with the outlet cavity 63, and two ends of each heat exchange unit 5 are connected with the two flow collectors 6 respectively.

[0248] In the technical solution, the inlet and outlet liquid structure 60 of the heat exchange assembly 50 is arranged at one end of the heat exchange assembly 50 along the first direction, so that the inlet and outlet liquid structure 60 on the heat exchange assembly 50 is connected with external related components.

[0249] In some embodiments, the ratio of the extension lengths of the heat exchange flow channel parts 5a of any two heat exchange units 5 is 0.8-1.2.

[0250] For example, the ratio of the extension lengths of the heat exchange flow channel parts 5a of any two heat exchange units 5 is 0.8, 0.9, 1, 1.1, 1.2, etc.

[0251] In the technical solution, the extension lengths of the heat exchange flow channel parts 5a of the plurality of heat exchange units 5 are close to each other, so that the heat exchange capacities of each heat exchange unit 5 are equivalent, the heat exchange is more uniform, and the overall heat exchange capacity of the heat exchange assembly 50 is stronger.

[0252] In some embodiments, referring to Figures 1-4 , the heat exchange assembly 50 is arranged in the box body 10.

[0253] In the technical solution, the heat exchange assembly 50 is arranged in the box body 10, so that the heat exchange assembly 50 is in better thermal contact with the battery monomer assembly 20, the thermal resistance between the heat exchange assembly 50 and the battery monomer assembly 20 is reduced, and the heat exchange efficiency is improved.

[0254] In some embodiments, referring to Figures 2-3 , the inner wall of the box body 10 is formed with a containing groove 112, the shape of the containing groove 112 is matched with the shape of the heat exchange unit 5, and the heat exchange unit 5 is arranged in the containing groove 112.

[0255] The shape of the containing groove 112 is matched with the shape of the heat exchange unit 5, including that the extension trajectory of the containing groove 112 is consistent with the extension trajectory of the heat exchange unit 5.

[0256] In the technical solution, the containing groove 112 for arranging the heat exchange unit 5 is arranged on the inner wall of the box body 10, so that the installation and positioning of the unit are facilitated.

[0257] In some embodiments, referring to Figures 2-3 , the inner wall of the box body 10 is formed with a plurality of convex ribs 111, and the plurality of convex ribs 111 cooperatively define the containing groove 112.

[0258] In the technical solution, the plurality of convex ribs 111 are arranged on the inner wall of the box body 10, and the containing groove 112 is defined by the plurality of convex ribs 111, so that the forming process of the containing groove 112 is facilitated, and the plurality of convex ribs 111 can improve the structural strength of the box body 10.

[0259] In some embodiments, referring toFigures 2-3 Part of the box 10 is protruded inwardly to form a plurality of ribs 111.

[0260] In the above technical solution, by making part of the box 10 protrude inwardly to form a plurality of ribs 111, the processing of the ribs 111 is facilitated, and while improving the structural strength of the box 10 through the plurality of ribs 111, the weight of the box 10 is not increased.

[0261] In some embodiments, referring to Figures 2-3 The box 10 includes a bottom plate 11, and the heat exchange assembly 50 is installed on the bottom plate 11.

[0262] For example, the heat exchange assembly 50 is installed on the upper side of the bottom plate 11.

[0263] The bottom plate 11 of the box 10 is located below the battery monomer assembly 20 to support the battery monomer assembly 20.

[0264] In the above technical solution, by arranging the heat exchange assembly 50 on the bottom plate 11 of the box 10, the heat exchange assembly 50 is located at a lower position in the box 10, facilitating the installation and fixation of the heat exchange assembly 50, and the center of gravity of the battery device 100 is lower, which is more stable and reliable.

[0265] In some embodiments, referring to Figures 2-3 The bottom plate 11 is provided with a mounting beam 12, the mounting beam 12 is arranged on the opposite sides of the heat exchange assembly 50 along the second direction, and the mounting beam 12 extends along the first direction. The battery monomer assembly 20 is connected with the mounting beam 12, and the second direction intersects the first direction.

[0266] In the above technical solution, by arranging the mounting beam 12 on the bottom plate 11, the battery monomer assembly 20 is facilitated to be installed and fixed on the bottom plate 11.

[0267] In some embodiments, the ratio of the size of the box 10 in the first direction to the size of the box 10 in the second direction is greater than 2, and the second direction intersects the first direction.

[0268] For example, the ratio of the size of the box 10 in the first direction to the size of the box 10 in the second direction is 2.2, 2.4, 2.6, 2.8, 3, 3.2, 3.4, 3.6, 3.8, 4, etc.

[0269] In the above technical solution, by making the size of the box 10 of the battery device 100 in the first direction significantly greater than the size of the box 10 in the second direction, the battery device 100 as a whole can be approximately rectangular. When the battery device 100 is applied to a vehicle, the first direction of the box 10 can be placed along the longitudinal direction of the vehicle, the longitudinal space of the vehicle can be fully utilized, and the capacity of the battery device 100 is improved.

[0270] In some embodiments, a ratio of a dimension of the case 10 in a third direction to a dimension of the case 10 in a second direction is less than 0.3, the third direction intersecting the second direction.

[0271] In the technical solution described above, by setting the dimension of the case 10 in the up-down direction to be small, the battery device 100 as a whole can be flat, which can reduce the occupation of the battery device 100 in the Z direction space of the vehicle when the battery device 100 is used in the vehicle, and is conducive to the layout of other components in the vehicle; and when the battery device 100 is installed at the bottom of the vehicle, the bottom surface height position of the battery device 100 will not be too low to cause easy scratch damage, and the risk of scratch damage of the battery device 100 during vehicle driving can be reduced.

[0272] In the second aspect, with reference to Figure 9 The application provides a power utilization device 1000, comprising the battery device 100 of the first aspect of the application.

[0273] In the technical solution described above, by setting the battery device 100 described above, the temperature regulation efficiency of the heat exchange assembly 50 of the battery device 100 on the battery monomer assembly 20 is high, and the lightweight requirement of the battery device 100 can be met.

[0274] In some embodiments, the power utilization device 1000 is a vehicle, and a longitudinal direction of the vehicle is the first direction.

[0275] For example, the battery device 100 can be arranged at the bottom of the vehicle body 200.

[0276] When the battery device 100 is used in the vehicle, the longitudinal direction of the vehicle refers to the arrangement direction of the head and the tail of the vehicle, the lateral direction of the vehicle is perpendicular to the longitudinal direction of the vehicle and perpendicular to the up-down direction, the up-down direction can refer to the Z direction in the drawings, the longitudinal direction of the vehicle is the first direction, and the lateral direction of the vehicle is the second direction.

[0277] In the technical solution described above, when the battery device 100 is used in the vehicle and the longitudinal direction of the vehicle is the first direction, the temperature regulation efficiency of the heat exchange assembly 50 of the battery device 100 on the battery monomer assembly 20 is high, which can improve the safety during vehicle driving; and when the length direction of the battery device 100 is arranged along the longitudinal direction of the vehicle, the longitudinal space of the vehicle can be fully utilized, which is conducive to improving the capacity of the battery device 100.

[0278] In the following Figures 1-8 The battery device 100 according to some embodiments of the application is described, in which the third direction is the up-down direction.

[0279] Reference Figures 1-8 In this embodiment, the battery device 100 comprises a box 10, a plurality of battery cell assemblies 20 accommodated in the box 10 and arranged along a first direction, and a heat exchange assembly 50. Each battery cell assembly 20 comprises two rows of battery cell rows 30 arranged along the first direction, and each battery cell row 30 comprises a plurality of battery cells 301 arranged along a second direction, the thickness direction of the battery cells 301 being consistent with the second direction. The heat exchange assembly 50 is arranged in the box 10 and located at the lower side of the battery cell assemblies 20.

[0280] The box 10 comprises a bottom plate 11 and a top cover 13 arranged on the upper side of the bottom plate 11 and connected with the bottom plate 11. The top cover 13 and the bottom plate 11 are detachably connected, and the bottom plate 11 and the top cover 13 jointly define a space for accommodating the battery cell assemblies 20. The bottom plate 11 is provided with mounting beams 12 arranged on opposite sides of the battery cell assemblies 20 along the second direction, and the battery cell assemblies 20 are connected with the mounting beams 12.

[0281] The size of the battery cells 301 in the up-down direction is smaller than the size of the battery cells 301 in the first direction, and the number of each row of battery cell rows 30 can be 15-20. The ratio of the size of the box 10 in the first direction to the size of the box 10 in the second direction is greater than 2, and the ratio of the size of the box 10 in the up-down direction to the size of the box 10 in the second direction is less than 0.3. The entire battery device 100 is in a rectangular flat shape.

[0282] The heat exchange assembly 50 is fixedly mounted on the bottom plate 11 and is in heat-conducting connection with the battery cell assemblies 20. The heat exchange assembly 50 comprises two heat exchange units 5 and an inlet-outlet liquid structure 60, and the inlet-outlet liquid structure 60 comprises two flow collectors 6 arranged along the first direction. One of the flow collectors 6 is formed with an inlet liquid cavity and an inlet liquid port 61, and the other flow collector 6 is formed with an outlet liquid cavity 63 and an outlet liquid port 62. The two ends of each heat exchange unit 5 are connected with the two flow collectors 6, respectively.

[0283] Each heat exchange unit 5 is formed as a heat exchange flat tube, and each heat exchange unit 5 includes a heat exchange flow passage portion 5a in which a heat exchange flow passage 51a is formed. Each heat exchange unit 5 includes a plurality of straight tube sections 51 and a plurality of bent tube sections 52, and two heat exchange units 5 are a first heat exchange unit 501 and a second heat exchange unit 502. The first heat exchange unit 501 includes a first straight tube section 511, a second straight tube section 512, a first bent tube section 521, and a second bent tube section 522, and the second heat exchange unit 502 includes the first straight tube section 511, the second straight tube section 512, a third straight tube section 513, a fourth straight tube section 514, the first bent tube section 521, the second bent tube section 522, a third bent tube section 523, and a fourth bent tube section 524. All of the first straight tube sections 511 and all of the first bent tube sections 521 of each heat exchange unit 5 constitute a bent main body, and the bent main bodies of the two heat exchange units 5 are arranged in a first direction.

[0284] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0285] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that, include: Box; A battery cell assembly, wherein the battery cell assembly is disposed within the housing, and the battery cell assembly comprises a plurality of battery cells; A heat exchange assembly for exchanging heat with the battery cell, the heat exchange assembly including at least one heat exchange unit, the heat exchange unit having a heat exchange channel portion, the heat exchange channel portion having a heat exchange channel for conducting heat exchange medium, the heat exchange channel portion including a straight pipe section extending in a straight line and a bent pipe section extending in an arc, the bent pipe section being connected between two adjacent straight pipe sections in the extension direction of the heat exchange unit, the ratio of the bending radius R of the bent pipe section to the width W of the heat exchange channel portion being k, where k is greater than 0.

5.

2. The battery device according to claim 1, characterized in that, The value of k ranges from 1.0 to 1.

5.

3. The battery device according to claim 1, characterized in that, The plurality of straight pipe segments in a single heat exchange channel section include a plurality of first straight pipe segments arranged at intervals along a first direction, each first straight pipe segment extending along a second direction. The plurality of bent pipe segments in a single heat exchange channel section include a first bent pipe segment, the first bent pipe segment connecting the same end of two adjacent first straight pipe segments along the second direction. The orthographic projections of the first straight pipe segment and the first bent pipe segment along a third direction are both located within the orthographic projection of the battery cell assembly along the third direction. The third direction, the second direction, and the first direction intersect each other.

4. The battery device according to claim 3, characterized in that, The extension length L of the first straight pipe section is greater than or equal to 50 mm.

5. The battery device according to claim 3, characterized in that, In the same heat exchange channel section, the distance d1 between two adjacent first straight pipe sections in the first direction is greater than the width W of the first straight pipe section.

6. The battery device according to claim 5, characterized in that, The ratio of the distance d1 between two adjacent first straight pipe sections in the first direction to the width W of the first straight pipe section in the same heat exchange channel section is less than 2.

7. The battery device according to claim 3, characterized in that, The ratio of the extension length of the first straight pipe section to the extension length of the first bent pipe section is 0.7 to 2.

8. The battery device according to claim 3, characterized in that, All the first straight pipe sections and all the first bent pipe sections in a single heat exchange channel constitute a bending body. There are multiple heat exchange units, and the bending bodies of the multiple heat exchange units are arranged sequentially along the first direction.

9. The battery device according to claim 8, characterized in that, The distance between two adjacent first straight pipe segments in the same bending body in the first direction is d1, and the distance between two adjacent first straight pipe segments in the first direction in two adjacent bending bodies is d2, where d2 is less than d1.

10. The battery device according to claim 3, characterized in that, All the first straight pipe segments and all the first bends in a single heat exchange channel section constitute a bending body. The plurality of straight pipe segments in a single heat exchange channel section include a second straight pipe segment. The second straight pipe segment in the same heat exchange channel section is located on at least one side of the bending body along the second direction. The second straight pipe segment extends along the first direction and is connected to the first straight pipe segment in the same heat exchange channel section.

11. The battery device according to claim 10, characterized in that, The minimum distance d3 between the first bend section and the second straight section in the same heat exchange channel section in the second direction is greater than or equal to 20 mm.

12. The battery device according to claim 10, characterized in that, The plurality of bends in a single heat exchange channel section include a second bend, the second bend connecting the first straight pipe section and the second straight pipe section in the same heat exchange channel section.

13. The battery device according to claim 10, characterized in that, All the first straight pipe sections and all the first bent pipe sections in a single heat exchange channel section constitute a bending body. There are two heat exchange units. The bending bodies of the two heat exchange units are arranged along the first direction. The two heat exchange units are a first heat exchange unit and a second heat exchange unit, respectively. The first heat exchange unit includes a second straight pipe section located on one side of the bent body of the first heat exchange unit along the second direction. The second heat exchange unit includes two second straight pipe sections located on both sides of the bent body of the second heat exchange unit along the second direction. The bent body has a first side and a second side opposite to each other in the second direction. The second straight pipe section of the first heat exchange unit and one of the second straight pipe sections of the second heat exchange unit are both located on the first side and arranged along the first direction. The other second straight pipe section of the second heat exchange unit is located on the second side and extends to one side of the bent body of the first heat exchange unit along the second direction.

14. The battery device according to claim 13, characterized in that, The minimum distance d3 between the first bent pipe section and the second straight pipe section in the same heat exchange channel section in the second direction, and the minimum distance d4 between the second straight pipe section located on the second side in the second heat exchange unit and the first bent pipe section in the first heat exchange unit in the second direction, are less than d3.

15. The battery device according to claim 13, characterized in that, The plurality of straight pipe sections in the second heat exchange unit further include a third straight pipe section and a fourth straight pipe section. Along the first direction, the third straight pipe section is located on the side of the bent body in the second heat exchange unit away from the bent body in the first heat exchange unit. The third straight pipe section extends along the second direction. Along the second direction, the fourth straight pipe section is disposed on the side of the second straight pipe section located on the second side away from the bent body. The fourth straight pipe section extends along the first direction. The third straight pipe section connects the second straight pipe section and the fourth straight pipe section in the second heat exchange unit.

16. The battery device according to claim 15, characterized in that, The multiple bends in the second heat exchange unit also include a third bend and a fourth bend. The third bend connects the second straight pipe section of the second heat exchange unit to the third straight pipe section, and the fourth bend connects the third straight pipe section to the fourth straight pipe section.

17. The battery device according to claim 15, characterized in that, The distance between two adjacent first straight pipe sections in the same heat exchange channel section in the first direction is d1, and the distance between the third straight pipe section and the nearest first straight pipe section in the first heat exchange unit is d5. The ratio of d5 to d1 is 0.7 to 1.

5.

18. The battery device according to claim 15, characterized in that, The distance between the fourth straight pipe segment and the second straight pipe segment located on the second side in the second direction is d6. The thickness direction of the battery cell is consistent with the second direction, and the thickness of the battery cell is t, where d6 is less than t.

19. The battery device according to claim 18, characterized in that, The ratio of d6 to t is 0.3 to 0.

8.

20. The battery device according to claim 3, characterized in that, The battery cell assembly includes one or more rows of battery cells arranged along the first direction, and each row of battery cells includes a plurality of battery cells arranged along the second direction.

21. The battery device according to claim 20, characterized in that, The orthographic projection of the first straight pipe segment along the third direction is located within the orthographic projection of the battery cell array along the third direction.

22. The battery device according to claim 21, characterized in that, Each of the battery cell rows corresponds to at least one first straight pipe segment, and the orthographic projection of the first straight pipe segment corresponding to each of the battery cell rows along the third direction is located within the orthographic projection of the corresponding battery cell row along the third direction.

23. The battery device according to claim 22, characterized in that, At least some of the battery cell rows correspond to a plurality of the first straight pipe sections.

24. The battery device according to claim 22, characterized in that, At least some of the battery cell rows have the same number of first straight pipe sections corresponding to each of the battery cell rows.

25. The battery device according to claim 20, characterized in that, All the first straight pipe sections and all the first bent pipe sections in a single heat exchange channel constitute a bending body. There are multiple heat exchange units, and the bending bodies of the multiple heat exchange units are arranged along the first direction. Different bending bodies are used for heat exchange with different battery cells.

26. The battery device according to claim 25, characterized in that, At least one of the heat exchange units satisfies the following relationship: W = (N*AB) / (X*N+(X*N-1)*(2k-1)), where N is the total number of battery cell rows, the number of first straight pipe sections corresponding to each battery cell row is the same and is X, A is the dimension of a single battery cell row in the first direction, the two sides of the bending body along the first direction are the first side edge and the second side edge, the two sides of the battery cell row that exchanges heat with the same bending body along the first direction are the first side edge and the second side edge, the bending body is located between the first side edge and the second side edge, the first side edge is adjacent to the first side edge and the distance between the first side edge and the first side edge in the first direction is B1, the second side edge is adjacent to the second side edge and the distance between the second side edge and the second side edge in the first direction is B2, and B is the sum of B1 and B2.

27. The battery device according to claim 1, characterized in that, The width W of the heat exchange channel is greater than the thickness t of the battery cell.

28. The battery device according to claim 27, characterized in that, The ratio of the width W of the heat exchange channel to the thickness t of the battery cell is less than 2.

29. The battery device according to claim 1, characterized in that, The heat exchange channel is formed as a heat exchange flat tube, the thickness direction of the heat exchange channel is consistent with the third direction, and at least one side surface of the heat exchange channel in the thickness direction is in thermal contact or thermally connected to the battery cell assembly.

30. The battery device according to claim 1, characterized in that, The surface of the heat exchange channel that is in thermal contact or thermally connected with the battery cell assembly is the heat exchange surface, and the heat exchange surface is a plane.

31. The battery device according to claim 1, characterized in that, The heat exchange assembly is arranged on at least one side of the battery cell assembly along a third direction.

32. The battery device according to claim 31, characterized in that, The sum of the projected areas of all the heat exchange units along the third direction is the first projected area, and the sum of the projected areas of all the battery cells along the third direction is the second projected area. The ratio of the first projected area to the second projected area is greater than 1 / 3.

33. The battery device according to claim 1, characterized in that, The heat exchange channel is provided with one or more flow dividers spaced apart along the width direction of the heat exchange channel, and the flow dividers extend along the extension direction of the heat exchange channel.

34. The battery device according to claim 33, characterized in that, The flow divider divides the heat exchange channel into multiple sub-channels arranged side by side and separated from each other, and the multiple sub-channels are arranged along the width direction of the heat exchange channel.

35. The battery device according to claim 33, characterized in that, The heat exchange channel is formed as a heat exchange flat tube, and the ratio of the thickness of the flow divider in the width direction of the heat exchange channel to the wall thickness of the heat exchange flat tube is 0.7 to 1.

2.

36. The battery device according to claim 1, characterized in that, There are multiple heat exchange units, and the multiple heat exchange units are arranged in parallel.

37. The battery device according to claim 36, characterized in that, The heat exchange assembly includes an inlet and outlet liquid structure, which has an inlet and an outlet liquid. Each heat exchange unit is connected to the inlet and outlet liquid structure. The heat exchange assembly has a first end and a second end that are arranged opposite to each other along a first direction, and the inlet and outlet liquid structure is located at the first end.

38. The battery device according to claim 36, characterized in that, The ratio of the extension lengths of the heat exchange flow channels of any two heat exchange units is 0.8 to 1.

2.

39. The battery device according to claim 1, characterized in that, The heat exchange assembly is located inside the housing.

40. The battery device according to claim 39, characterized in that, The inner wall of the housing is formed with a receiving groove, the shape of which is adapted to the shape of the heat exchange unit, and the heat exchange unit is arranged in the receiving groove.

41. The battery device according to claim 40, characterized in that, The inner wall of the box is formed with multiple ribs, which cooperate to define the receiving groove.

42. The battery device according to claim 41, characterized in that, A portion of the box body protrudes inward to form a plurality of the ribs.

43. The battery device according to claim 39, characterized in that, The housing includes a base plate, and the heat exchange assembly is mounted on the base plate.

44. The battery device according to claim 43, characterized in that, The base plate is provided with mounting beams, which are arranged on opposite sides of the heat exchange assembly along the second direction and extend along the first direction. The battery cell assembly is connected to the mounting beams, and the second direction intersects the first direction.

45. The battery device according to claim 1, characterized in that, The ratio of the dimension of the box in the first direction to the dimension of the box in the second direction is greater than 2, and the second direction intersects the first direction.

46. ​​The battery device according to claim 1, characterized in that, The ratio of the dimension of the box in the third direction to the dimension of the box in the second direction is less than 0.3, and the third direction intersects with the second direction.

47. An electrical appliance, characterized in that, The battery device includes any one of claims 1-46.

48. The electrical appliance according to claim 47, characterized in that, The electrical device is a vehicle, and the longitudinal direction of the vehicle is the first direction.

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