Cold plate, battery pack and electric equipment

Abstract

The utility model relates to a cold plate, a battery pack and electric equipment, the cold plate is provided with a first flow channel, and at least part of the first flow channel is in a continuous bending shape; the first flow channel has the sectional area in the direction perpendicular to the medium flowing direction, and the sectional area of at least part of the first flow channel continuously changes in the medium flowing direction. According to the technical scheme, the heat exchange efficiency between the cold plate and the medium can be improved.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of batteries, in particular to a cold plate, a battery pack and an electric device. BACKGROUND

[0002] In the related art, a cold plate is usually in contact with a battery to exchange heat with the battery and adjust the temperature of the battery. The current cold plate has low heat exchange efficiency with the battery. CONTENT

[0003] The purpose of the present disclosure is to provide a cold plate, a battery pack and an electric device, which can improve the heat exchange efficiency between the cold plate and a medium.

[0004] To achieve the above purpose, the present disclosure provides a cold plate, which is provided with a first flow channel, at least part of the first flow channel is in a continuous bending shape; wherein the first flow channel has a cross-sectional area in a direction perpendicular to the medium flow direction, and the cross-sectional area of at least part of the first flow channel continuously changes in the medium flow direction.

[0005] Optionally, the first flow channel comprises at least one expansion section and at least one contraction section, the expansion section and the contraction section are arranged alternately, the first flow channel has a width in a first direction perpendicular to the medium flow direction, the width of the expansion section continuously widens in the medium flow direction; the width of the contraction section continuously narrows in the medium flow direction.

[0006] Optionally, the first flow channel comprises at least one convex section and at least one concave section, the first flow channel has a height in a second direction perpendicular to the medium flow direction, the height of the convex section continuously increases in the medium flow direction; the height of the concave section continuously decreases in the medium flow direction.

[0007] Optionally, the first flow channel comprises a first sub-flow channel and a second sub-flow channel, the first sub-flow channel extends in the length direction of the cold plate, and the second sub-flow channel extends in the width direction of the cold plate.

[0008] Optionally, the cold plate is provided with a second flow channel in communication with the first flow channel, the second flow channel has a cross-sectional area in a direction perpendicular to the medium flow direction, and the cross-sectional area of the second flow channel remains the same in the medium flow direction.

[0009] Optionally, the cold plate has a first plate section provided with the first flow channel, and / or the cold plate has a second plate section provided with a second flow channel.

[0010] Optionally, the cold plate has a second plate section and two first plate sections, and the second plate section is arranged between the two first plate sections.

[0011] Optionally, the cold plate comprises a substrate and a flow channel plate, the flow channel plate has a recess, and the substrate and the recess enclose the first flow channel.

[0012] On the basis of the above technical solution, the disclosure further provides a battery pack comprising the cold plate.

[0013] Optionally, the battery pack comprises a plurality of battery cells arranged in columns, the battery cells have first portions and second portions, the first portions generate more heat than the second portions, the first portions are attached to the first plate segments, and the second portions are attached to the second plate segments.

[0014] Optionally, the battery pack comprises three columns of battery cells, each column of battery cells comprises a plurality of battery cells, the middle column of battery cells is attached to the second plate segments, and the edge column of battery cells is attached to the first plate segments.

[0015] On the basis of the above technical solution, the disclosure further provides a power consumption device comprising the battery pack.

[0016] Optionally, the power consumption device is configured as a vehicle.

[0017] Through the above technical solution, in the cold plate provided by the disclosure, the cold plate is provided with a first flow channel in a continuous bending shape, and at least part of the first flow channel has a continuously changing cross-sectional area in the medium flow direction. Thus, compared with a plurality of parallel straight flow channels, the arrangement of the bending flow channel can increase the space occupied by the first flow channel on the cold plate, thereby increasing the contact area between the medium and the flow channel wall of the first flow channel, i.e., the cold plate, and improving the heat exchange efficiency between the medium and the cold plate. In addition, compared with a flow channel with the same cross-sectional area, the continuously changing cross-sectional area of the first flow channel can form a wave-shaped flow channel wall, which can also increase the contact area between the medium and the cold plate and increase the resistance of the medium flowing in the first flow channel to achieve sufficient contact between the medium and the cold plate and further improve the heat exchange efficiency between the medium and the cold plate. When the cold plate is applied in the technical field of battery packs, by contacting the battery cells of the battery pack with the cold plate, the heat exchange efficiency between the medium and the battery cells can be improved, and the heat exchange requirement of the battery pack can be met.

[0018] Other features and advantages of the disclosure will be described in detail in the following specific embodiments section. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the disclosure and constitute a part of the specification, and together with the following specific embodiments, serve to explain the disclosure but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1is a structural schematic view of a cold plate provided by an exemplary embodiment of the present disclosure;

[0021] Figure 2 is a perspective view of a cold plate provided by an exemplary embodiment of the present disclosure;

[0022] Figure 3 is a structural schematic view of a flow channel plate provided by a first exemplary embodiment of the present disclosure;

[0023] Figure 4 is a structural schematic view of a flow channel plate provided by a second exemplary embodiment of the present disclosure;

[0024] Figure 5 is Figure 4 a partial enlarged schematic view;

[0025] Figure 6 is a sectional view of a cold plate provided by a first exemplary embodiment of the present disclosure;

[0026] Figure 7 is a sectional view of a cold plate provided by a second exemplary embodiment of the present disclosure;

[0027] Figure 8 is a sectional view of a cold plate provided by a third exemplary embodiment of the present disclosure;

[0028] Figure 9 is a structural schematic view of a cold plate and an electric core provided by an exemplary embodiment of the present disclosure;

[0029] Figure 10 is a structural schematic view of a battery pack provided by an exemplary embodiment of the present disclosure.

[0030] BRIEF DESCRIPTION OF DRAWINGS

[0031] 1 - cold plate; 11 - first flow channel; 111 - expansion section; 112 - contraction section; 113 - protrusion section; 114 - recess section; 12 - second flow channel; 13 - first plate section; 14 - second plate section; 15 - flow channel plate; 151 - recess part; R1 - inner chamfer; R2 - outer chamfer; 16 - base plate; 171 - first sub-flow channel; 172 - second sub-flow channel; 181 - inlet; 182 - outlet; 2 - electric core; 21 - first part; 22 - second part; 3 - heat conduction layer; 100 - battery pack. DETAILED DESCRIPTION

[0032] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the present disclosure, and are not intended to limit the present disclosure.

[0033] In the present disclosure, the orientation words such as "inner" and "outer" used without the opposite description generally refer to "inner" and "outer" relative to the contour of the corresponding component itself, the "length direction of the cold plate" refers to the horizontal direction of the middle plane, Figure 4 the "width direction of the cold plate" refers to the vertical direction of the middle plane, Figure 4 the "first direction" refers to the first direction shown in the middle, Figure 7 the "second direction" refers to the second direction shown in the middle, Figure 7 the "width of the first flow channel" refers to the size of D in the middle, Figure 7 the "height of the first flow channel" refers to the size of H in the middle, Figure 7 the "radius of the inner chamfer" refers to the size of R1 in the middle, Figure 7 the "radius of the outer chamfer" refers to the size of R2 in the middle, Figure 7 In addition, the terms "first", "second" and the like used in the present disclosure are used to distinguish one element from another element, and do not have sequential and important meanings. In addition, in the following description, the same reference signs in different drawings represent the same or similar elements unless otherwise explained. The above definitions are only used to explain and illustrate the present disclosure, and should not be understood as a limitation on the present disclosure.

[0034] According to the specific embodiment provided by the present disclosure, with reference to Figures 1 to 10 As shown in the middle, a cold plate 1 is provided, which is provided with a first flow channel 11, at least part of the first flow channel 11 is in a continuous bending shape; wherein the first flow channel 11 has a cross-sectional area in the direction perpendicular to the medium flow direction, and the cross-sectional area of at least part of the first flow channel 11 continuously changes in the medium flow direction.

[0035] Through the above technical solution, in the cold plate 1 provided by the present disclosure, the cold plate 1 is provided with a first flow channel 11 in a continuous bending shape, and at least part of the first flow channel 11 has a continuously changing cross-sectional area in the medium flow direction. Compared with multiple parallel straight flow channels, the arrangement of the bending flow channel can increase the space occupied by the first flow channel 11 on the cold plate 1, thereby increasing the contact area between the medium and the flow channel wall of the first flow channel 11, i.e. the cold plate 1, and improving the heat exchange efficiency between the medium and the cold plate 1. In addition, compared with the flow channel with the same cross-sectional area, the continuously changing cross-sectional area of the first flow channel 11 can make the first flow channel 11 form a wavy flow channel wall, which can also increase the contact area between the medium and the cold plate 1, and increase the resistance of the medium flowing in the first flow channel 11, so as to realize the sufficient contact between the medium and the cold plate 1, and further improve the heat exchange efficiency between the medium and the cold plate 1. When the cold plate 1 is applied in the technical field of the battery pack 100, by contacting the battery cell 2 of the battery pack 100 with the cold plate 1, the heat exchange efficiency between the medium and the battery cell 2 can be improved, and the heat exchange demand of the battery pack 100 can be met.

[0036] In some embodiments, with reference to Figure 4 As shown in FIG. 1, the first flow channel 11 can have an inlet 181 and an outlet 182, and a portion of the first flow channel 11 between the inlet 181 and the outlet 182 continuously extends, so as to simplify the molding of the first flow channel 11. In some embodiments, the first flow channel 11 can have a continuous bending shape and have first sub-flow channels 171 and second sub-flow channels 172 that are alternately connected in sequence, and the first flow channel 11 can include at least one first sub-flow channel 171 and at least one second sub-flow channel 172, without limitation to the present disclosure.

[0037] In the cold plate provided by the present disclosure, as an exemplary embodiment, with reference to Figure 3 and Figure 5 As shown in FIG. 1, the first flow channel 11 can include at least one expansion section 111 and at least one contraction section 112, and the expansion sections 111 and the contraction sections 112 are alternately arranged, and the first flow channel 11 has a width in a first direction perpendicular to the medium flow direction, the width of the expansion section 111 continuously increases along the medium flow direction, and the width of the contraction section 112 continuously decreases along the medium flow direction. That is, the first flow channel 11 forms a flow channel with a continuously changing width in the medium flow direction, that is, the first flow channel 11 forms a wavy side wall in the medium flow direction, so as to further increase the contact area between the medium and the cold plate 1, and further improve the heat exchange efficiency between the medium and the cold plate 1.

[0038] As another exemplary embodiment, with reference to Figure 6 As shown in FIG. 1, the first flow channel 11 can include at least one convex section 113 and at least one concave section 114, and the first flow channel 11 has a height in a second direction perpendicular to the medium flow direction, the height of the convex section 113 continuously increases along the medium flow direction, and the height of the concave section 114 continuously decreases along the medium flow direction. In this way, the first flow channel 11 forms a flow channel cross section with a changing height in the medium flow direction, that is, the first flow channel 11 forms a wavy top wall in the medium flow direction, so as to further increase the contact area between the medium and the cold plate 1, and further improve the heat exchange efficiency between the medium and the cold plate 1.

[0039] The convex section 113 and the concave section 114 can also be alternately arranged to enable the first flow channel 11 to have a flow channel section with a continuously changing height in the medium flow direction, or the convex section 113 and the concave section 114 can also be arranged at intervals, that is, the convex section 113 and the concave section 114 are connected with a flow channel with a constant height in the medium flow direction. The above manners can further improve the heat exchange efficiency between the medium and the cold plate 1. In combination with the above embodiments, the first flow channel 11 provided by the present disclosure can be a flow channel with a continuously changing width and a continuously changing height in the medium flow direction, that is, the first flow channel 11 can be a flow channel with a wavy side wall and a top wall to as far as possible improve the heat exchange efficiency between the medium and the cold plate 1.

[0040] In some embodiments, after the expansion section 111 and the contraction section 112 are arranged, the convex section 113 and the concave section 114 can be arranged upstream or downstream of the expansion section 111 and the contraction section 112, or in another embodiment, the expansion section 111 can have at least one convex section 113 and at least one concave section 114, that is, the convex section 113 and the concave section 114 are arranged in the expansion section 111. Similarly, the contraction section 112 can have at least one convex section 113 and at least one concave section 114, that is, the convex section 113 and the concave section 114 are arranged in the contraction section 112. The present disclosure does not limit this.

[0041] In the cold plate provided by the present disclosure, as an exemplary embodiment, referring to Figure 4 , the first flow channel 11 can include a first sub-flow channel 171 and a second sub-flow channel 172. The first sub-flow channel 171 can extend along the length direction of the cold plate, and the second sub-flow channel 172 can extend along the width direction of the cold plate. That is, the cold plate 1 can also not be provided with the second flow channel 12, and the first flow channel 11 can include the first sub-flow channel 171 and the second sub-flow channel 172. The first sub-flow channel 171 can extend along the length direction (referring to the left-right direction of Figure 4 ) of the cold plate 1, and the second sub-flow channel 172 can extend along the width direction (referring to the up-down direction of Figure 4 ) of the cold plate 1. The first sub-flow channel 171 and the second sub-flow channel 172 can each include the expansion section 111 and the contraction section 112. The number of the first sub-flow channel 171 and the second sub-flow channel 172 can each be multiple. In this way, two adjacent first sub-flow channels 171 extending along the length direction of the cold plate 1 can be connected through the second sub-flow channel 172 extending along the width direction of the cold plate 1. Thus, the first flow channel 11 can be uniformly distributed on the cold plate 1 along the length and width directions of the cold plate 1, thereby improving the overall heat exchange efficiency of the cold plate 1.

[0042] In the cold plate provided by the present disclosure, as an exemplary embodiment, referring to Figure 3As shown, the cold plate 1 may be provided with a second flow channel 12 communicating with the first flow channel 11. The second flow channel 12 may have a cross-sectional area in a direction perpendicular to the medium flow direction, and the cross-sectional area of ​​the second flow channel 12 remains the same in the medium flow direction. That is to say, the second flow channel 12 is a flow channel with a constant cross-sectional size. By controlling the position of the first flow channel 11 and the second flow channel 12 on the cold plate 1, the cold plate 1 can enhance the local heat exchange efficiency. When the cold plate 1 is applied in the technical field of battery pack 100, it can solve the problem of uneven heating of battery pack 100.

[0043] Based on the above embodiments, as an exemplary embodiment, refer to Figure 3 and Figure 9 As shown, the cold plate 1 may have a first plate segment 13, which may be provided with a first flow channel 11 and / or a second plate segment 14, which may be provided with a second flow channel 12. In this way, the first plate segment 13 can be correspondingly set in the part of the battery pack 100 with a large amount of heat generation to improve the cooling efficiency of that part; the second plate segment 14 can be set in the part of the battery pack 100 with a small amount of heat generation to meet the strength and pressure resistance requirements of the cold plate 1 itself.

[0044] Specifically, refer to Figure 9 As shown, the cold plate 1 may have a second plate segment 14 and two first plate segments 13. In this disclosure, the two first plate segments 13 are disposed at both ends in the width direction of the cold plate 1 and are arranged close to the edge of the cold plate 1. The second plate segment 14 may be disposed in a position close to the inside of the cold plate 1. In this way, the first plate segment 13 can achieve local enhancement of the heat exchange effect of the cold plate 1, and the second plate segment 14 can enhance the structural strength of the cold plate 1.

[0045] In the cold plate provided in this disclosure, as an exemplary embodiment, reference is made to... Figure 1 or Figure 2 As shown, the cold plate 1 may include a substrate 16 and a flow channel plate 15. The flow channel plate 15 may have a recessed portion 151, and the substrate 16 and the recessed portion 151 form a first flow channel 11. That is, the recessed portion 151 may be recessed towards one side of the flow channel plate 15, while the substrate 16 may be disposed on the opposite side of the flow channel plate 15 and be attached and fixed to the flow channel plate 15. In this way, the first flow channel 11 is formed between the flow channel plate 15 and the substrate 16 for the flow of medium. In some embodiments, the substrate may be constructed as a flat plate.

[0046] The recessed portion 151 can be integrally formed with the flow channel plate 15 by means of stamping or other methods, and this disclosure does not impose specific limitations on this. In addition, the flow channel plate 15 and the substrate 16 can be fixed in any suitable way. In this disclosure, the flow channel plate 15 and the substrate 16 can be fixed together by welding, such as brazing, and this disclosure does not impose specific limitations on this.

[0047] On the basis of the above-mentioned embodiments, with reference to Figure 7 The recess 151 can be configured as an arc-shaped groove, and the recess 151 can have an inner chamfer R1 tangent to the base plate 16, the radius of the inner chamfer R1 being 1.0 mm to 3.0 mm, for example, 1.2 mm, 1.5 mm, 1.7 mm, 2.0 mm, 2.2 mm, 2.5 mm, 2.9 mm, etc., which is not specifically limited in the present disclosure. Among them, on the one hand, the setting of the inner chamfer R1 can facilitate mold demolding when the cold plate 1 forms the first flow channel 11 or the second flow channel 12 through the stamping process, and on the other hand, compared with a right angle, it can also improve the structural strength and pressure resistance of the cold plate 1. Among them, the size of the inner chamfer R1 can be arbitrarily designed according to the size or material of the cold plate 1 in actual conditions, and in the present disclosure, the radius of the inner chamfer R1 is designed to be 1.0 mm to 3.0 mm, which can facilitate the processing of the inner chamfer R1 on the basis of meeting the structural strength of the cold plate 1. In addition, the recess 151 can also have an outer chamfer R2, and the size of the outer chamfer R2 can be 2.0 mm to 4.0 mm, for example, 3.7 mm, which can also achieve the purpose of facilitating mold demolding and improving the structural performance of the cold plate 1, which is not specifically limited in the present disclosure.

[0048] In some other embodiments, with reference to Figure 8 The recess 151 of the flow channel plate 15 can also not be provided with a chamfer, and the cross section of the recess can be a rectangular surface, which can also be surrounded together with the base plate 16 to form the first flow channel 11, which is not specifically limited in the present disclosure.

[0049] On the basis of the above-mentioned embodiments, the width of the first flow channel 11 can be arbitrarily set according to the size of the cold plate 1 in actual conditions, which is not specifically limited in the present disclosure. As an exemplary embodiment, with reference to Figure 7 The width of the first flow channel 11 can be 7.0 mm to 12.0 mm, for example, 7.4 mm to 11.4 mm, specifically, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, 10.5 mm, 11 mm, 11.5 mm, etc., which can increase the area of the first flow channel 11 on the cold plate as much as possible on the basis of ensuring the pressure resistance of the cold plate 1, thereby further improving the heat exchange efficiency of the cold plate 1.

[0050] On the basis of the above-mentioned embodiments, the height of the first flow channel 11 can be arbitrarily set according to the size of the cold plate 1 in actual conditions, which is not specifically limited in the present disclosure. As an exemplary embodiment, with reference to Figure 6As shown in the figure, the height of the first flow channel 11 can be 1.5mm-3.5mm, such as 1.7mm, 2.0mm, 2.5mm, 2.7mm, 2.8mm, 3.0mm, 3.4mm, etc., which can increase the area of the first flow channel 11 on the cold plate 1 as much as possible on the basis of ensuring the pressure resistance of the cold plate 1, and further improve the heat exchange efficiency of the cold plate 1.

[0051] In addition, in the present disclosure, the thickness of the cold plate 1, that is, the thickness of the flow channel plate 15 and the base plate 16, can be designed to be any suitable size according to actual conditions, and in the present disclosure, the flow channel plate 15 and the base plate 16 can be designed to be the same size, for example, 1mm-2mm, and specifically, 1.2mm, which is not limited in the present disclosure.

[0052] It should be noted that the working medium in the present disclosure can be any medium that can be liquefied in a low-temperature device, such as R134a (tetrafluoroethane) refrigerant, etc., which is not limited in the present disclosure. The cold plate 1, that is, the flow channel plate 15 and the base plate 16, can be made of any material with light weight and high thermal conductivity, such as aluminum alloy, etc., which is not limited in the present disclosure. In addition, in the present disclosure, the cold plate 1 can also be provided with at least one opening for the medium to enter or exit. Since the present disclosure does not involve improvements in the structure or principle of the opening, it will not be described here.

[0053] On the basis of the above technical solutions, the present disclosure also provides a battery pack comprising the above cold plate 1. The cold plate 1 has all the technical features of the cold plate 1 described above, and therefore will not be described here.

[0054] In the battery pack provided by the present disclosure, as an exemplary embodiment, with reference to Figure 9 As shown in the figure, the battery pack 100 can include a plurality of battery cells 2 arranged in columns, and the battery cells 2 can have a first portion 21 and a second portion 22, the heat generation of the first portion 21 being greater than that of the second portion 22, and the first portion 21 can be attached to the first plate segment 13, and the second portion 22 can be attached to the second plate segment 14. In this way, according to the different heat generation of each portion of the battery cells 2 in the battery pack 100, the first plate segment 13 provided with the first flow channel 11 is attached to the portion with greater heat generation (i.e. the first portion 21), and the second plate segment 14 provided with the second flow channel 12 is attached to the portion with smaller heat generation (i.e. the second portion 22), thereby achieving the effect of strengthening heat exchange for the local uneven heat generation of the battery pack 100, and achieving uniform heat dissipation for the battery cells.

[0055] In some embodiments, the battery cell 2 can be configured to include a row of blade batteries, which have two first parts 21 in the arrangement direction of the blade batteries, and a second part 22 can be arranged between the two first parts 21, wherein each first part 21 can be attached to a first plate segment 13, and the second part 22 is attached to a second plate segment 14, that is, the two ends of the blade battery have high heat generation, and the middle has low heat generation, and the first plate segment 13 and the second plate segment 14 on the cold plate can be correspondingly arranged.

[0056] In yet some embodiments, the battery cell 2 can include three rows of blade batteries arranged side by side, each blade battery has a first part 21 and a second part 22 with different heat generation, so that the cold plate 1 can also be correspondingly provided with a plurality of first plate segments 13 and second plate segments 14, wherein the first plate segment 13 is attached to the first part 21 with larger heat generation, and the second plate segment 14 is attached to the second part 22 with smaller heat generation.

[0057] In other embodiments, as shown in Figure 10 The battery pack 100 can also include a first battery pack and a second battery pack, that is, the battery pack 100 can be configured as an A / B hybrid battery pack, the heat generation of the first battery pack is greater than that of the second battery pack, and the first battery pack can be attached to the first plate segment 13, and the second battery pack can be attached to the second plate segment 14. Similarly, according to the different heat generation of the first battery pack and the second battery pack, the first plate segment 13 provided with the first flow channel 11 can be attached to the part with larger heat generation (i.e. the first battery pack), and the second plate segment 14 provided with the second flow channel 12 can be attached to the part with smaller heat generation (i.e. the second battery pack), thereby achieving the effect of strengthening heat exchange for the local uneven heat generation of the battery pack 100. Among them, the first battery pack can be a sodium battery pack, and the second battery pack can be a lithium battery pack, the first plate segment 13 of the cold plate 1 is attached to the sodium battery pack, and the second plate segment 14 is attached to the lithium battery pack; or the first battery pack can be a ternary battery pack, and the second battery pack can be a lithium iron phosphate battery pack, the first plate segment 13 of the cold plate 1 is attached to the ternary battery pack, and the second plate segment 14 is attached to the lithium iron phosphate battery pack, all of which can achieve the purpose of local heat exchange strengthening and achieve uniform heat dissipation of the battery pack 100.

[0058] In the battery pack provided in the present disclosure, as an exemplary embodiment, as shown in Figure 10 The battery pack 100 can also include at least one heat-conducting layer 3 arranged between the cold plate 1 and the battery cell 2, so as to improve the heat exchange efficiency between the cold plate 1 and the battery cell 2.

[0059] On the basis of the above technical solution, the present disclosure further provides a power utilization device comprising the battery pack 100. The battery pack 100 has all the technical features of the battery pack 100 described above, and thus will not be described here. Here, the power utilization device can be configured as a vehicle, for example, a hybrid vehicle or a pure electric vehicle.

[0060] The preferred embodiments of the present disclosure are described in detail above in combination with the drawings, but the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept scope of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and all these simple modifications belong to the protection scope of the present disclosure.

[0061] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combination manners.

[0062] In addition, various different embodiments of the present disclosure can also be combined in any manner as long as they do not deviate from the idea of the present disclosure, and they should also be considered as disclosed by the present disclosure.

Claims

1. A cold-rolled steel plate, characterized in that, The cold plate is provided with a first flow channel, at least a portion of which is continuously bent; wherein the first flow channel has a cross-sectional area in a direction perpendicular to the medium flow direction, and the cross-sectional area of ​​at least a portion of the first flow channel continuously changes in the medium flow direction.

2. The cold-rolled plate according to claim 1, characterized in that, The first flow channel includes at least one expansion section and at least one contraction section, the expansion section and the contraction section are alternately arranged, the first flow channel has a width along a first direction perpendicular to the medium flow direction, the width of the expansion section continuously increases along the medium flow direction, and the width of the contraction section continuously decreases along the medium flow direction.

3. The cold-rolled plate according to claim 1, characterized in that, The first flow channel includes at least one raised section and at least one recessed section. The first flow channel has a height along a second direction perpendicular to the medium flow direction. The height of the raised section continuously increases along the medium flow direction, and the height of the recessed section continuously decreases along the medium flow direction.

4. The cold-rolled plate according to any one of claims 1-3, characterized in that, The first flow channel includes a first branch channel and a second branch channel. The first branch channel extends along the length direction of the cold plate, and the second branch channel extends along the width direction of the cold plate.

5. The cold-rolled plate according to any one of claims 1-3, characterized in that, The cold plate is provided with a second flow channel communicating with the first flow channel. The second flow channel has a cross-sectional area in a direction perpendicular to the medium flow direction, and the cross-sectional area of ​​the second flow channel remains the same in the medium flow direction.

6. The cold-rolled plate according to claim 5, characterized in that, The cold plate has a first plate segment, the first plate segment being provided with a first flow channel and / or the cold plate has a second plate segment, the second plate segment being provided with a second flow channel.

7. The cold-rolled plate according to claim 6, characterized in that, The cold plate has a second plate segment and two first plate segments, with the second plate segment disposed between the two first plate segments.

8. The cold-rolled plate according to claim 1, characterized in that, The cold plate includes a substrate and a flow channel plate, the flow channel plate having a recessed portion, and the substrate and the recessed portion forming the first flow channel.

9. A battery pack, characterized in that, Includes the cold plate according to any one of claims 1-8.

10. The battery pack according to claim 9, characterized in that, The battery pack includes a plurality of cells arranged in a row. Each cell has a first part and a second part. The heat generated by the first part is greater than that generated by the second part. The first part is attached to a first plate segment, and the second part is attached to a second plate segment.

11. The battery pack according to claim 9, characterized in that, The battery pack includes three rows of cells, each row of cells includes multiple cells, the middle row of cells is bonded to the second plate segment, and the edge row of cells is bonded to the first plate segment.

12. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 9-11.

13. The electrical equipment according to claim 12, characterized in that, The electrical equipment is constructed as a vehicle.

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