Heat exchange structure, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a heat exchange structure, a battery pack and electric equipment. The heat exchange structure comprises a first cover plate, a second cover plate and a runner plate, wherein the first cover plate and the second cover plate are arranged at an interval; the runner plate is connected between the first cover plate and the second cover plate; the runner plate comprises a first side close to the first cover plate and a second side close to the second cover plate, the first side is provided with a plurality of first grooves sunken towards the second cover plate, the second side is provided with a plurality of second grooves sunken towards the first cover plate, and the first grooves and the second grooves are alternately arranged; the first groove and the first cover plate are enclosed to form a first flow channel, and the second groove and the second cover plate are enclosed to form a second flow channel; the sectional areas of the first flow channels are sequentially increased in the flowing direction of the cooling medium in the first flow channels; in the flowing direction of the cooling medium in the second flow channel, the sectional area of the second flow channel is sequentially increased, the flowing area of the cooling medium is increased, cooling and heat dissipation are achieved on the two sides of the flow channel plate, the heat exchange area is increased, the space utilization rate of the flow channel plate is increased, and the heat exchange effect is improved.

Description

Technical Field

[0001] This application belongs to the technical field of heat exchange, and particularly relates to a heat exchange structure, a battery pack, and an electrical device. Background Art

[0002] A battery pack usually includes a battery cell module and a heat exchange structure. The heat exchange structure is connected to the battery cell module and is used to dissipate heat from the battery cell module, which has a relatively important impact on the performance of the battery pack.

[0003] In the prior art, the heat exchange structure usually includes a cover plate and a liquid cooling plate connected to the cover plate. A plurality of grooves are formed on one side of the liquid cooling plate by stamping. The plurality of grooves are arranged at intervals and enclose a plurality of flow channels with the cover plate. A flowing cooling medium is introduced into the flow channels to achieve heat dissipation and temperature reduction of the battery cell module.

[0004] However, the inventor found in the process of studying the prior art that since the plurality of grooves are arranged at intervals, the plurality of flow channels are distributed at intervals, and there are gaps between adjacent two flow channels, resulting in a small heat exchange area of the cooling medium and a poor heat exchange effect. Summary of the Utility Model

[0005] In view of the above problems, the present utility model is proposed to provide a heat exchange structure, a battery pack, and an electrical device that overcome the above problems or at least partially solve the above problems.

[0006] In order to solve the above technical problems, the present application is implemented as follows:

[0007] In a first aspect, an embodiment of the present application provides a heat exchange structure, which includes: a first cover plate and a second cover plate arranged at intervals, and a flow channel plate connected between the first cover plate and the second cover plate; wherein,

[0008] The flow channel plate includes a first side close to the first cover plate and a second side close to the second cover plate. A plurality of first grooves recessed towards the second cover plate are provided on the first side, and a plurality of second grooves recessed towards the first cover plate are provided on the second side. The first grooves and the second grooves are arranged alternately;

[0009] The first grooves and the first cover plate enclose a first flow channel, and the second grooves and the second cover plate enclose a second flow channel;

[0010] Along the flowing direction of the cooling medium in the first flow channel, the cross-sectional area of the first flow channel increases sequentially;

[0011] Along the flowing direction of the cooling medium in the second flow channel, the cross-sectional area of the second flow channel increases sequentially.

[0012] Optionally, the liquid inlet end of the first flow channel and the liquid outlet end of the second flow channel are located on the same side of the heat exchange structure, the liquid outlet end of the first flow channel and the liquid inlet end of the second flow channel are located on the same side of the heat exchange structure, and the liquid outlet end of two adjacent first flow channels and the liquid inlet end of the second flow channel are communicated, so that the flow directions of the cooling medium in the first flow channel and the cooling medium in the second flow channel are opposite.

[0013] Optionally, the heat exchange structure further includes a flow dividing portion disposed at the liquid inlet end of the first flow channel. The inside of the flow dividing portion has a flow dividing cavity, and an inlet communicating with the flow dividing cavity is disposed on the flow dividing portion. The liquid inlet ends of a plurality of the first flow channels are all communicated with the flow dividing cavity; and / or,

[0014] The heat exchange structure further includes a flow collecting portion disposed at the liquid outlet end of the second flow channel. The inside of the flow collecting portion has a flow collecting cavity, and an outlet communicating with the flow collecting cavity is disposed on the flow collecting portion. The liquid outlet ends of a plurality of the second flow channels are all communicated with the flow collecting cavity.

[0015] Optionally, the flow dividing cavity includes a plurality of sub-flow dividing cavities arranged at intervals. The plurality of sub-flow dividing cavities communicate with each other, and the plurality of sub-flow dividing cavities are arranged in one-to-one correspondence with the plurality of first flow channels. Each sub-flow dividing cavity is communicated with the liquid inlet end of the corresponding first flow channel;

[0016] Along the flow direction of the cooling medium in the flow dividing cavity, the volumes of the plurality of sub-flow dividing cavities decrease in sequence.

[0017] Optionally, the flow collecting cavity includes a plurality of sub-flow collecting cavities arranged at intervals. The plurality of sub-flow collecting cavities communicate with each other, and the plurality of sub-flow collecting cavities are arranged in one-to-one correspondence with the plurality of second flow channels. Each sub-flow collecting cavity is communicated with the liquid outlet end of the corresponding second flow channel;

[0018] Along the flow direction of the cooling medium in the flow collecting cavity, the volumes of the plurality of sub-flow collecting cavities increase in sequence.

[0019] Optionally, the inlet and the outlet are arranged adjacent to each other; or,

[0020] The inlet and the outlet are symmetrically arranged with respect to the central axis of the heat exchange structure.

[0021] Optionally, the flow channel plate, the flow dividing portion and the flow collecting portion are of an integrally formed structure.

[0022] Optionally, the heat exchange structure further includes a turning portion. The turning portion is disposed at the liquid outlet end of the first flow channel and the liquid inlet end of the second flow channel. The turning portion is provided with a cavity, and the cavity is respectively communicated with the liquid outlet end of the first flow channel and the liquid inlet end of the second flow channel.

[0023] Optionally, an opening is provided on one side of the flow channel plate near the liquid outlet end of the first flow channel and the liquid inlet end of the second flow channel, and the first cover plate and the second cover plate corresponding to the opening enclose to form the turning portion.

[0024] Optionally, on one side close to the turning portion, the cross-sectional area of the first flow channel is the same as that of the second flow channel.

[0025] Optionally, a plurality of the first flow channels are symmetrically distributed relative to the central axis of the heat exchange structure, and a plurality of the second flow channels are symmetrically distributed relative to the central axis of the heat exchange structure.

[0026] Optionally, the side wall of the first groove is inclined relative to the horizontal plane, and the inclination angle of the side wall of the first groove is any value between 0.5 - 1°.

[0027] Optionally, the side wall of the second groove is inclined relative to the horizontal plane, and the inclination angle of the side wall of the second groove is any value between 0.5 - 1°.

[0028] Optionally, a first skirt is provided at the edge of the first cover plate, a second skirt is provided at the position corresponding to the first skirt on the second cover plate, and a third skirt is provided on the flow channel plate between the first skirt and the second skirt;

[0029] The third skirt is welded to the first skirt and the second skirt respectively.

[0030] Optionally, a microstructure is provided on the surface of at least one of the first cover plate, the second cover plate, and the flow channel plate, and the microstructure is located in the first flow channel and / or the second flow channel.

[0031] Optionally, the cross-sectional shape of the first flow channel is at least one of a trapezoid, a rectangle, or an arc, and the cross-sectional shape of the second flow channel is at least one of a trapezoid, a rectangle, or an arc.

[0032] In a second aspect, an embodiment of the present application provides a battery pack, which includes a battery cell module and the heat exchange structure as described above;

[0033] The heat exchange structure is connected to the battery cell module.

[0034] In a third aspect, an embodiment of the present application provides an electrical device, which includes the battery pack as described above, or the heat exchange structure as described above.

[0035] In the embodiment of the present application, the heat exchange structure includes: a first cover plate and a second cover plate arranged at intervals, and a flow channel plate connected between the first cover plate and the second cover plate; wherein, the flow channel plate includes a first side close to the first cover plate and a second side close to the second cover plate, the first side is provided with a plurality of first grooves recessed towards the second cover plate, the second side is provided with a plurality of second grooves recessed towards the first cover plate, and the first grooves and the second grooves are arranged alternately; the first grooves and the first cover plate enclose a first flow channel, and the second grooves and the second cover plate enclose a second flow channel; along the flow direction of the cooling medium in the first flow channel, the cross-sectional area of the first flow channel increases sequentially; along the flow direction of the cooling medium in the second flow channel, the cross-sectional area of the second flow channel increases sequentially. In this way, a plurality of first flow channels are formed between the first side of the flow channel plate and the first cover plate through the first grooves, and a plurality of second flow channels are formed between the second side of the flow channel plate and the second cover plate through the second grooves, greatly increasing the flow area of the cooling medium, enabling the cooling medium flowing in the first flow channel on the first side of the flow channel plate to cool the battery pack. At the same time, the cooling medium flowing in the second flow channel on the second side of the flow channel plate can also cool the battery pack, enabling both sides of the flow channel plate to achieve cooling and heat dissipation of the battery pack, increasing the heat exchange area of the cooling medium, improving the space utilization rate of the flow channel plate, and enhancing the heat exchange effect of the heat exchange structure. It avoids the interval distribution of multiple flow channels caused by the interval arrangement of multiple grooves, eliminates the gaps existing between adjacent two flow channels, and increases the effective heat exchange area of the cooling medium. Since the cross-sectional area of the first flow channel increases sequentially, a gradually expanding structure of the first flow channel is realized, enabling the flow rate of the cooling medium in the first flow channel to gradually increase. Thus, when part of the cooling medium in the first flow channel vaporizes due to heat exchange to form a gas-liquid mixture, the gradually expanding first flow channel reduces the flow velocity of the above gas-liquid mixture, reduces the acceleration pressure drop caused by the acceleration of the cooling medium flow, and reduces the flow resistance of the cooling medium in the first flow channel. Then, along the output direction of the cooling medium in the second flow channel, since the cross-sectional area of the second flow channel increases sequentially, a gradually expanding structure of the second flow channel is realized, enabling the flow rate of the cooling medium in the second flow channel to gradually increase, which is beneficial to the smooth discharge of the cooling medium from the heat exchange structure and reduces the resistance loss brought by the gradually expanding design itself.

[0036] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0038] Figure 1 It is a schematic structural diagram of a heat exchange structure according to an embodiment of the present application;

[0039] Figure 2 It is a top view of a flow channel plate of a heat exchange structure according to an embodiment of the present application;

[0040] Figure 3 It is a schematic cross-sectional structure diagram of a heat exchange structure according to an embodiment of the present application;

[0041] Figure 4 It is one of the partially enlarged structural diagrams of a flow channel plate of a heat exchange structure according to an embodiment of the present application;

[0042] Figure 5 It is the second of the partially enlarged structural diagrams of a flow channel plate of a heat exchange structure according to an embodiment of the present application;

[0043] Figure 6 It is a schematic structural diagram of an outlet and an inlet of a heat exchange structure according to an embodiment of the present application;

[0044] Figure 7 It is an outlet and an inlet of a heat exchange structure according to an embodiment of the present application Figure 6 front view;

[0045] Figure 8 It is the third of the partially enlarged structural diagrams of a flow channel plate of a heat exchange structure according to an embodiment of the present application.

[0046] Reference numerals: 10 - first cover plate; 20 - second cover plate; 30 - flow channel plate; 31 - first groove; 32 - second groove; 33 - first flow channel; 34 - second flow channel; 40 - shunt portion; 41 - sub-shunt cavity; 42 - first end; 43 - second end; 50 - turning portion; 51 - cavity; 35 - opening; 44 - inlet; 45 - outlet; 12 - first skirt; 22 - second skirt; 36 - third skirt. Detailed implementation manners

[0047] Hereinafter, embodiments of the present invention will be described in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts fall within the scope of protection of the present application.

[0048] The terms "first" and "second" in the description and claims of this application may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally indicates an "or" relationship between the associated objects before and after.

[0049] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to this utility model.

[0050] In the description of this utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0051] Refer to Figures 1 to 8 , which shows a schematic structural diagram of a heat exchange structure described in an embodiment of this application. The heat exchange structure may specifically include: a first cover plate 10 and a second cover plate 20 arranged at intervals, and a flow channel plate 30 connected between the first cover plate 10 and the second cover plate 20; wherein,

[0052] The flow channel plate 30 includes a first side close to the first cover plate 10 and a second side close to the second cover plate 20. The first side is provided with a plurality of first grooves 31 recessed towards the second cover plate 20, and the second side is provided with a plurality of second grooves 32 recessed towards the first cover plate 10. The first grooves 31 and the second grooves 32 are arranged alternately;

[0053] The first groove 31 and the first cover plate 1* enclose a first flow channel 33, and the second groove 32 and the second cover plate 20 enclose a second flow channel 34;

[0054] Along the flowing direction of the cooling medium in the first flow channel 33, the cross-sectional area of the first flow channel 33 increases in sequence;

[0055] Along the flowing direction of the cooling medium in the second flow channel 34, the cross-sectional area of the second flow channel 34 increases successively.

[0056] In the embodiment of the present application, a plurality of first flow channels 33 are formed between the first side of the flow channel plate 30 and the first cover plate 10 through the first groove 31, and a plurality of second flow channels 34 are formed between the second side of the flow channel plate 30 and the second cover plate 20 through the second groove 32, greatly increasing the flowing area of the cooling medium. The cooling medium flowing in the first flow channels 33 on the first side of the flow channel plate 30 can cool the battery pack. At the same time, the cooling medium flowing in the second flow channels 34 on the second side of the flow channel plate 30 can also cool the battery pack, enabling both sides of the flow channel plate 30 to achieve cooling and heat dissipation of the battery pack, increasing the heat exchange area of the cooling medium, improving the space utilization rate of the flow channel plate 30, and enhancing the heat exchange effect of the heat exchange structure. It avoids the interval distribution of multiple flow channels caused by the interval arrangement of multiple grooves, eliminates the gap between adjacent two flow channels, and increases the effective heat exchange area of the cooling medium.

[0057] Specifically, in the embodiment of the present application, the first cover plate 10 is connected to the notch of the first groove 31, and the two enclose to form the first flow channel 33. The bottom of the first groove 31 is connected to the second cover plate 20. For example, the bottom of the first groove 31 can be welded to the second cover plate 20, so that the first flow channel 33 has a larger space. The second cover plate 20 is connected to the notch of the second groove 32, and the two enclose to form the second flow channel 34. The bottom of the second groove 32 is connected to the first cover plate 10. For example, the bottom of the second groove 32 can be welded to the first cover plate 10, so that the second flow channel 34 has a larger space. In this way, the flow transmission of the cooling medium between the first flow channel 33 and the second flow channel 34 is not affected, and the cooling medium in the first flow channel 33 and the second flow channel 34 is prevented from flowing through each other.

[0058] In the embodiment of the present application, since the cross-sectional area of the first flow channel 33 increases successively, a gradually expanding structure of the first flow channel 33 is realized, so that the flow rate of the cooling medium in the first flow channel 33 gradually increases. Thus, when part of the cooling medium in the first flow channel 33 vaporizes due to heat exchange to form a gas-liquid mixture, the gradually expanding first flow channel 33 reduces the flow velocity of the above gas-liquid mixture, reduces the acceleration pressure drop caused by the acceleration of the cooling medium flow, and reduces the flow resistance of the cooling medium in the first flow channel 33. Then, along the output direction of the second flow channel 34, since the cross-sectional area of the second flow channel 34 increases successively, a gradually expanding structure of the second flow channel 34 is realized, so that the flow rate of the cooling medium in the second flow channel 34 gradually increases, which is beneficial to the smooth discharge of the cooling medium from the heat exchange structure and reduces the resistance loss brought by the gradually expanding design itself.

[0059] Specifically, in the embodiments of the present application, when the cooling medium flows in the channel and is in a laminar flow state, the cooling medium will generate frictional resistance along the way. Since the frictional resistance is proportional to the square of the fluid flow velocity of the cooling medium and the frictional resistance coefficient, and the frictional resistance coefficient is inversely proportional to the flow Reynolds number. Therefore, without considering the change in fluid physical properties, the flow resistance of the cooling medium in the laminar flow state is at least proportional to the velocity. When considering the change in physical properties caused by the evaporation of the cooling medium or when the flow enters the turbulent state, the fluid flow velocity has a greater impact on the resistance. Therefore, in the embodiments of the present application, by setting the cross-sectional area of the first flow channel 33 to increase sequentially along the flowing direction of the cooling medium therein, the flow velocity of the cooling medium in the first flow channel 33 is reduced, and the influence of the flow velocity of the cooling medium on the resistance is greatly reduced.

[0060] Exemplarily, for the commonly used refrigerant R134a within the operating temperature range of the power battery, the density of its saturated liquid is usually about twenty times that of the saturated gas. Therefore, in the direct cooling scheme adopted in the prior art, the volume expansion caused by the vaporization of the cooling medium in the refrigeration plate and the flow acceleration of the two-phase mixture will cause a significant increase in the flow resistance. For example, if the cooling medium undergoes a vaporization phase change process from saturated liquid to saturated gas in the cold plate, it can be concluded that when the direct cooling cold plate adopts the same design scheme of equal flow cross-section as the water cooling plate, the average frictional resistance in the flow channel is more than ten times that of the water cooling plate with the same flow channel layout, resulting in a large resistance for the cooling medium and also affecting the temperature uniformity of the heat exchange structure. A compressor is usually used in the heat exchange system to provide power, correspondingly increasing the power consumption of the compressor. However, the heat exchange structure provided by the embodiments of the present application reduces the resistance of the cooling medium by setting the first flow channel 33 and the second flow channel 34 with a gradually expanding structure, improves the temperature uniformity of the heat exchange structure, and also reduces the power consumption of the compressor.

[0061] Exemplarily, in the embodiments of the present application, compared with the cold plate structure of the conventional corrugated tube in the prior art, the heat exchange structure of the embodiments of the present application makes the structures of the flow channel plate 30, the first cover plate 10, and the second cover plate 20 relatively compact through the first flow channel 33 and the second flow channel 34, which is easy to process, reduces the process difficulty, and can also be designed into a thinner structure, which is beneficial to the spatial layout of the product. On the other hand, compared with the serpentine flow channel cold plate in the prior art, the heat exchange structure of the embodiments of the present application makes the overall outer surface have better flatness through the first cover plate 10 and the second cover plate 20, which is beneficial to the assembly of the heat exchange structure and the battery cell module.

[0062] In the embodiments of the present application, by way of example, the first cover plate 10, the flow channel plate 30, and the second cover plate 20 can be respectively made by stamping process. The process is relatively simple and easy to obtain. By way of example, the cooling medium can be refrigerant R134a, and can also be refrigerant R513a, etc., which can be set according to actual needs. The embodiments of the present application may not limit the specific type of the cooling medium.

[0063] Optionally, in the embodiments of the present application, the liquid inlet end of the first flow channel 33 and the liquid outlet end of the second flow channel 34 are located on the same side of the heat exchange structure. The liquid outlet end of the first flow channel 33 and the liquid inlet end of the second flow channel 34 are located on the same side of the heat exchange structure. The liquid outlet end of two adjacent first flow channels 33 and the liquid inlet end of the second flow channel 34 are communicated, so that the flow directions of the cooling medium in the first flow channel 33 and the cooling medium in the second flow channel 34 are opposite. By way of example, the first flow channel 33 can be used to input the cooling medium, and the second flow channel 34 can be used to output the cooling medium. Two adjacent first flow channels 33 and the second flow channel 34 are communicated, and the flow directions of the cooling medium in the first flow channel 33 and the second flow channel 34 are opposite. Specifically, the cooling medium can be input into the heat exchange structure along the first flow channel 33, and then flow out of the heat exchange structure in the reverse direction along the second flow channel 34, realizing the circulating flow of the cooling medium in the heat exchange structure. And because the first grooves 31 and the second grooves 32 on the flow channel plate 30 are arranged alternately, the first flow channel 33 and the second flow channel 34 are also arranged alternately. In the case of cooling and dissipating heat of the battery pack, the temperature of the cooling medium input into the first flow channel 33 is relatively low. The heat generated by the battery pack exchanges heat with the cooling medium in the first flow channel 33, that is, the cooling medium in the first flow channel 33 absorbs the heat generated by the battery pack and the temperature rises. Then the temperature of the cooling medium output from the second flow channel 34 is relatively high. Among two adjacent first flow channels 33 and the second flow channel 34, the cooling medium with a relatively low temperature in the first flow channel 33 can also exchange heat with the cooling medium with a relatively high temperature in the second flow channel 34, so that the flow channel plate 30, the first cover plate 10, and the second cover plate 20 have better temperature uniformity, and a relatively balanced and stable heat exchange effect on the battery pack is realized.

[0064] In the embodiments of the present application, optionally, the heat exchange structure further includes a flow dividing part 40 arranged at the liquid inlet end of the first flow channel 33. The inside of the flow dividing part 40 has a flow dividing cavity. An inlet 44 communicated with the flow dividing cavity is arranged on the flow dividing part 40. The liquid inlet ends of a plurality of first flow channels 33 are all communicated with the flow dividing cavity; and / or, the heat exchange structure further includes a converging part arranged at the liquid outlet end of the second flow channel 34. The inside of the converging part has a converging cavity. An outlet 45 communicated with the converging cavity is arranged on the converging part. The liquid outlet ends of a plurality of second flow channels 34 are all communicated with the converging cavity.

[0065] In an embodiment of the present application, at the liquid inlet end of the first flow channel 33, the flow dividing part 40 may be provided with an inlet 44, and the inlet 44 communicates with the flow dividing cavity. Through the inlet 44, it is convenient to introduce the cooling medium into the flow dividing cavity. Moreover, at the liquid outlet end of the second flow channel 34, the flow collecting part may be provided with an outlet 45, and the outlet 45 communicates with the flow collecting cavity. Through the outlet 45, it is convenient to output the cooling medium from the flow collecting cavity, realizing the recycling and recovery of the cooling medium. Moreover, the liquid inlet of the first flow channel 33 is realized through the flow dividing cavity of the flow dividing part 40, so that the liquid inlet of multiple first flow channels 33 can be realized through the flow dividing part 40, which has good liquid inlet stability and is convenient for making the flow distribution of the cooling medium in multiple first flow channels 33 relatively uniform. Moreover, the confluence of the cooling medium output from the second flow channel 34 is realized through the flow collecting cavity of the flow collecting part, so that the liquid outlet of multiple second flow channels 34 can also be realized through the flow collecting part, which has good output stability and is convenient for making the output of the cooling medium in multiple second flow channels 34 have good uniformity.

[0066] Exemplarily, in an embodiment of the present application, the flow collecting part may be arranged on the back side of the flow dividing part 40, and the flow collecting part and the flow dividing part 40 are of an integrally formed structure. In this way, the connection strength between the flow dividing part 40 and the flow collecting part is relatively high, and material loss and manufacturing processes are reduced. Exemplarily, the flow direction of the cooling medium in the flow dividing cavity and the flow collecting cavity may be the same or opposite, and the embodiment of the present application may not limit this.

[0067] In an embodiment of the present application, optionally, the flow dividing cavity includes a plurality of sub-flow dividing cavities 41 arranged at intervals, and the plurality of sub-flow dividing cavities 41 communicate with each other. The plurality of sub-flow dividing cavities 41 are arranged in one-to-one correspondence with the plurality of first flow channels 33, and each sub-flow dividing cavity 41 communicates with the liquid inlet end of the corresponding first flow channel 33; along the flow direction of the cooling medium in the flow dividing cavity, the volumes of the plurality of sub-flow dividing cavities 41 gradually decrease, so as to balance the pressure of the cooling medium in the flow dividing cavity. Exemplarily, the flow dividing part 40 may include a first end 42 and a second end 43 arranged back to back, and the cooling medium flows in the flow dividing cavity along the direction from the first end 42 to the second end 43. Specifically, the plurality of sub-flow dividing cavities 41 in the flow dividing part 40 communicate with each other, and the cooling medium can flow from the first end 42 of the flow dividing cavity towards the second end 43. When the volumes of the plurality of sub-flow dividing cavities 41 are the same, the pressure of the cooling medium in the sub-flow dividing cavity 41 close to the first end 42 is relatively large, and the pressure of the cooling medium in the sub-flow dividing cavity 41 close to the second end 43 is relatively small, which easily leads to a large pressure difference of the cooling medium transported from each sub-flow dividing cavity 41 into the first flow channel 33 and is not conducive to the temperature uniformity of the heat exchange structure. Therefore, the volumes of the plurality of sub-flow dividing cavities 41 are arranged to gradually decrease along the direction from the first end 42 to the second end 43 of the cooling medium, so that the pressure of the cooling medium in the plurality of sub-flow dividing cavities 41 is relatively balanced, which is beneficial to improving the temperature uniformity performance of the heat exchange structure.

[0068] Optionally, in the embodiments of the present application, the confluence cavity includes a plurality of sub-confluence cavities arranged at intervals, and the plurality of sub-confluence cavities communicate with each other. The plurality of sub-confluence cavities are arranged in one-to-one correspondence with a plurality of second flow channels 34, and each sub-confluence cavity communicates with the liquid outlet end of the corresponding second flow channel 34; along the flowing direction of the cooling medium in the confluence cavity, the volumes of the plurality of sub-confluence cavities increase in sequence. Specifically, since the confluence part can be arranged on the back side of the shunt part 40, the cooling medium after heat exchange can flow in the confluence cavity from the second end 43 towards the first end 42. When the volumes of the plurality of sub-confluence cavities are the same, the pressure of the cooling medium near the second end 43 is relatively small, while the pressure of the cooling medium near the first end 42 is relatively large, which easily leads to a large pressure difference between the sub-confluence cavities at different positions and is not conducive to the temperature uniformity of the heat exchange structure. Therefore, the volumes of the plurality of sub-confluence cavities are arranged to increase in sequence along the direction in which the cooling medium is transmitted from the second end 43 to the first end 42, so that the pressures of the cooling medium in the plurality of sub-confluence cavities are relatively balanced, which is conducive to improving the temperature uniformity performance of the heat exchange structure.

[0069] In the embodiments of the present application, optionally, the inlet 44 and the outlet 45 are arranged adjacent to each other; or, the inlet 44 and the outlet 45 are symmetrically arranged with respect to the central axis of the heat exchange structure. When the inlet 44 and the outlet 45 are arranged adjacent to each other, it is convenient to arrange the interface connected to the inlet 44 and the interface connected to the outlet 45 at the same position, which is beneficial to the spatial layout of the overall structure of the battery pack and improves the space utilization rate. In addition, the inlet 44 and the outlet 45 can also be symmetrically arranged on both sides of the heat exchange structure according to needs, and then the interface connected to the inlet 44 and the interface connected to the outlet 45 can be respectively arranged on the symmetric sides of the heat exchange structure, and two connection interfaces are respectively arranged, which is beneficial to the flow stability of the cooling medium in the heat exchange structure.

[0070] Optionally, in the embodiments of the present application, the flow channel plate 30, the shunt part 40 and the confluence part are of an integrally formed structure. In this way, the connection strength between the flow channel plate 30, the shunt part 40 and the confluence part is relatively high, and the material loss and manufacturing processes are reduced. Specifically, the depth of the first groove 31 provided in the flow channel plate 30 is greater than the depth of the shunt cavity of the shunt part 40 to facilitate the connection of the plurality of sub-shunt cavities 41, and the depth of the second groove 32 provided in the flow channel plate 30 is greater than the depth of the confluence cavity of the shunt part 40 to facilitate the connection of the plurality of sub-confluence cavities.

[0071] In an embodiment of the present application, optionally, the heat exchange structure further includes a turning portion 50 disposed at the liquid outlet end of the first flow channel 33 and the liquid inlet end of the second flow channel 34. The turning portion 50 is provided with a cavity 51, and the cavity 51 is respectively communicated with the liquid outlet end of the first flow channel 33 and the liquid inlet end of the second flow channel 34. In this way, the turning flow of the cooling medium between the first flow channel 33 and the second flow channel 34 is realized through the turning portion 50, that is, as Figure 2 shown, the cooling medium can flow upward from bottom to the turning portion 50 along the first flow channel 33 on the front surface of the flow channel plate 30, and then flow out downward along the second flow channel 34 on the back surface of the flow channel plate 30 through the turning portion 50, realizing the circulating flow of the cooling medium in the first flow channel 33 and the second flow channel 34.

[0072] For example, in an embodiment of the present application, the flow channel plate 30 is provided with an opening 35 near the liquid outlet end of the first flow channel 33 and the liquid inlet end of the second flow channel 34. The corresponding first cover plate 10 and second cover plate 20 at the opening 35 can enclose to form the turning portion 50. For example, the opening 35 can be disposed on the side of the flow channel plate 30 away from the shunt portion 40. Since the flow channel plate 30 is disposed between the first cover plate 10 and the second cover plate 20, setting the opening 35 on the side of the flow channel plate 30 away from the shunt portion 40 causes a gap between the first cover plate 10 and the second cover plate 20 to form the turning portion 50, which has a simple structure, is convenient for processing, and is easy to implement.

[0073] Optionally, in an embodiment of the present application, on one side close to the turning portion 50, the cross-sectional area of the first flow channel 33 is the same as the cross-sectional area of the second flow channel 34. In this way, the cooling medium in the first flow channel 33 has good continuity when flowing into the second flow channel 34 after commutation, and the stability of the cooling medium during the commutation transmission process is improved.

[0074] In an embodiment of the present application, optionally, a plurality of first flow channels 33 are symmetrically distributed relative to the central axis of the heat exchange structure, and a plurality of second flow channels 34 are symmetrically distributed relative to the central axis of the heat exchange structure. In this way, the cooling medium in the symmetrically distributed plurality of first flow channels 33 has good temperature uniformity for the flow channel plate 30 and the first cover plate 10 and the second cover plate 20, and the cooling medium in the symmetrically distributed plurality of second flow channels 34 also has good temperature uniformity for the flow channel plate 30 and the first cover plate 10 and the second cover plate 20, further improving the temperature balance performance of the heat exchange structure during the heat exchange process.

[0075] Optionally, in the embodiments of the present application, the side wall of the first groove 31 is inclined relative to the horizontal plane, and the inclination angle of the side wall of the first groove 31 is any value in the range of 0.5 - 1°. In this way, the cross-sectional area change of the first flow channel 33 formed between the first groove 31 and the first cover plate 10 can be made more appropriate, avoiding a situation where a large change in the cross-sectional area causes the flow rate of the cooling medium to be too slow, resulting in poor circulation, and also avoiding a situation where a small change in the cross-sectional area causes the flow rate of the cooling medium to be too fast, resulting in a poor effect of reducing resistance, and also reducing the resistance loss caused by the gradually expanding structure formed by the first flow channel 33.

[0076] Exemplarily, in the embodiments of the present application, the inclination angle of the side wall of the first groove 31 can be 0.5°, 0.6°, 0.8°, or 1°, etc., and can be set according to actual needs. The embodiments of the present application do not need to limit the specific value of the inclination angle of the side wall of the first groove 31.

[0077] In the embodiments of the present application, optionally, the side wall of the second groove 32 is inclined relative to the horizontal plane, and the inclination angle of the side wall of the second groove 32 is any value in the range of 0.5 - 1°. Similarly, the cross-sectional area change of the second flow channel 34 formed between the second groove 32 and the second cover plate 20 can be made more appropriate, avoiding a situation where a large change in the cross-sectional area causes the flow rate of the cooling medium to be too slow, resulting in poor circulation, and also avoiding a situation where a small change in the cross-sectional area causes the flow rate of the cooling medium to be too fast, resulting in a poor effect of reducing resistance, and also reducing the resistance loss caused by the gradually expanding structure formed by the second flow channel 34.

[0078] Exemplarily, in the embodiments of the present application, the inclination angle of the side wall of the second groove 32 can be 0.5°, 0.6°, 0.8°, or 1°, etc., and can be set according to actual needs. The embodiments of the present application do not need to limit the specific value of the inclination angle of the side wall of the second groove 32. In addition, the inclination angle of the side wall of the second groove 32 can be the same as or different from the inclination angle of the side wall of the first groove 31, and the embodiments of the present application do not need to limit this.

[0079] Optionally, in the embodiments of the present application, the first cover plate 10 is provided with a first skirt 12 at its edge, the second cover plate 20 is provided with a second skirt 22 at a position corresponding to the first skirt 12, and the flow channel plate 30 is provided with a third skirt 36 between the first skirt 12 and the second skirt 22; the third skirt 36 is welded to the first skirt 12 and the second skirt 22 respectively. In this way, through the welding of the third skirt 36 to the first skirt 12 and the second skirt 22 respectively, a relatively stable and reliable connection between the flow channel plate 30, the first cover plate 10, and the second cover plate 20 is achieved, enabling the first cover plate 10 and the second cover plate 20 to achieve good sealing performance for the first flow channel 33 and the second flow channel 34 formed with the flow channel plate 30.

[0080] In an embodiment of the present application, optionally, a microstructure is provided on the surface of at least one of the first cover plate 10, the second cover plate 20, and the flow channel plate 30, and the microstructure is located within the first flow channel 33 and / or the second flow channel 34. In an embodiment of the present application, the microstructure refers to a pattern structure or a concave-convex structure with a relatively small size. In this way, the contact area between the first flow channel 33 and the second flow channel 34 and the cooling medium can be increased through the microstructure, further improving the heat exchange effect. For example, the microstructure can be a roll-embossed structure or a concave-convex structure, etc. The specific type of the microstructure in the embodiment of the present application may not be limited. Specifically, the microstructure can be provided on the surface of the first cover plate 10 on the side close to the flow channel plate 30, or on the surface of the second cover plate 20 on the side close to the flow channel plate 30, and the microstructure can be respectively provided on the first side surface and the second side surface of the flow channel plate 30. The specific setting position of the microstructure in the embodiment of the present application may not be limited.

[0081] Optionally, in an embodiment of the present application, the cross-sectional shape of the first flow channel 33 is at least one of a trapezoid, a rectangle, or an arc shape, and the cross-sectional shape of the second flow channel 34 is at least one of a trapezoid, a rectangle, or an arc shape. In this way, the shape of the flow channel plate 30 can be a sawtooth shape, a broken line shape, a wave shape, etc. The specific shape of the flow channel plate 30 in the embodiment of the present application may not be limited. The setting methods of the first flow channel 33 and the second flow channel 34 are enriched, and can be set according to actual needs such as the resistance reduction effect test or the assembly situation.

[0082] For example, in an embodiment of the present application, the cross-sectional shape of some of the plurality of first flow channels 33 can be a trapezoid, the cross-sectional shape of some of the first flow channels 33 can be a rectangle, and the cross-sectional shape of some of the first flow channels 33 can also be an arc shape. The cross-sectional shapes between the plurality of first flow channels 33 can be the same or different, and the embodiment of the present application may not limit this. Similarly, the cross-sectional shape of some of the plurality of second flow channels 34 can be a trapezoid, the cross-sectional shape of some of the second flow channels 34 can be a rectangle, and the cross-sectional shape of some of the second flow channels 34 can also be an arc shape. The cross-sectional shapes between the plurality of second flow channels 34 can be the same or different, and the embodiment of the present application may not limit this. In addition, the cross-sectional shape of the first flow channel 33 can be the same as or different from the cross-sectional shape of the second flow channel 34, and the embodiment of the present application may not limit this either.

[0083] In summary, the heat exchange structure described in the embodiment of the present application can at least have the following advantages:

[0084] In an embodiment of the present application, the heat exchange structure includes: a first cover plate and a second cover plate arranged at intervals, and a flow channel plate connected between the first cover plate and the second cover plate; wherein, the flow channel plate includes a first side close to the first cover plate and a second side close to the second cover plate, the first side is provided with a plurality of first grooves recessed towards the second cover plate, the second side is provided with a plurality of second grooves recessed towards the first cover plate, and the first grooves and the second grooves are arranged alternately; the first grooves and the first cover plate enclose a first flow channel, and the second grooves and the second cover plate enclose a second flow channel; along the flow direction of the cooling medium in the first flow channel, the cross-sectional area of the first flow channel increases successively; along the flow direction of the cooling medium in the second flow channel, the cross-sectional area of the second flow channel increases successively. In this way, a plurality of first flow channels are formed between the first side of the flow channel plate and the first cover plate through the first grooves, and a plurality of second flow channels are formed between the second side of the flow channel plate and the second cover plate through the second grooves, greatly increasing the flow area of the cooling medium, enabling the cooling medium flowing in the first flow channel on the first side of the flow channel plate to cool the battery pack. At the same time, the cooling medium flowing in the second flow channel on the second side of the flow channel plate can also cool the battery pack, enabling both sides of the flow channel plate to achieve cooling and heat dissipation of the battery pack, increasing the heat exchange area of the cooling medium, improving the space utilization rate of the flow channel plate, and enhancing the heat exchange effect of the heat exchange structure. It avoids the interval distribution of multiple flow channels caused by the interval arrangement of multiple grooves, eliminates the gaps between adjacent two flow channels, and increases the effective heat exchange area of the cooling medium. Since the cross-sectional area of the first flow channel increases successively, a gradually expanding structure of the first flow channel is realized, enabling the flow rate of the cooling medium in the first flow channel to gradually increase. Thus, when a part of the cooling medium in the first flow channel vaporizes due to heat exchange to form a gas-liquid mixture, the gradually expanding structure of the first flow channel reduces the flow velocity of the above gas-liquid mixture, reduces the acceleration pressure drop caused by the acceleration of the cooling medium flow, and reduces the flow resistance of the cooling medium in the first flow channel. Then, along the output direction of the cooling medium in the second flow channel, since the cross-sectional area of the second flow channel increases successively, a gradually expanding structure of the second flow channel is realized, enabling the flow rate of the cooling medium in the second flow channel to gradually increase, which is beneficial to the smooth discharge of the cooling medium from the heat exchange structure and reduces the resistance loss brought by the gradually expanding design itself.

[0085] An embodiment of the present application further provides a battery pack, which includes a battery cell module and the heat exchange structure; the heat exchange structure is connected to the battery cell module. Exemplarily, the first cover plate 10 can be connected to the battery cell module, or the second cover plate 20 can be connected to the battery cell module, and the embodiment of the present application does not limit this.

[0086] Exemplarily, in the embodiments of the present application, the battery pack may be a square shell type battery pack, a cylindrical battery pack, a soft pack type battery pack, etc. The embodiments of the present application may not limit the specific type of the battery pack.

[0087] The battery pack described in the embodiments of the present application may at least include the following advantages:

[0088] In the embodiments of the present application, the battery pack includes a battery cell module and the heat exchange structure; the heat exchange structure is connected to the battery cell module, and the heat exchange structure includes: a first cover plate and a second cover plate arranged at intervals, and a flow channel plate connected between the first cover plate and the second cover plate; wherein, the flow channel plate includes a first side close to the first cover plate and a second side close to the second cover plate, the first side is provided with a plurality of first grooves recessed towards the second cover plate, the second side is provided with a plurality of second grooves recessed towards the first cover plate, and the first grooves and the second grooves are arranged alternately; the first grooves and the first cover plate enclose a first flow channel, and the second grooves and the second cover plate enclose a second flow channel; along the flow direction of the cooling medium in the first flow channel, the cross-sectional area of the first flow channel increases in sequence; along the flow direction of the cooling medium in the second flow channel, the cross-sectional area of the second flow channel increases in sequence. In this way, a plurality of first flow channels are formed between the first side of the flow channel plate and the first cover plate through the first grooves, and a plurality of second flow channels are formed between the second side of the flow channel plate and the second cover plate through the second grooves, greatly increasing the flow area of the cooling medium, enabling the cooling medium flowing in the first flow channel on the first side of the flow channel plate to cool the battery pack. At the same time, the cooling medium flowing in the second flow channel on the second side of the flow channel plate can also cool the battery pack, enabling both sides of the flow channel plate to achieve cooling and heat dissipation of the battery pack, increasing the heat exchange area of the cooling medium, improving the space utilization rate of the flow channel plate, and improving the heat exchange effect of the heat exchange structure. It avoids the interval distribution of multiple flow channels caused by the interval arrangement of multiple grooves, eliminates the gaps existing between adjacent two flow channels, and increases the effective heat exchange area of the cooling medium. Since the cross-sectional area of the first flow channel increases in sequence, a gradually expanding structure of the first flow channel is realized, enabling the flow rate of the cooling medium in the first flow channel to gradually increase. Thus, when a part of the cooling medium in the first flow channel vaporizes due to heat exchange to form a gas-liquid mixture, the gradually expanding structure of the first flow channel reduces the flow velocity of the above gas-liquid mixture, reduces the acceleration pressure drop caused by the acceleration of the cooling medium flow, and reduces the flow resistance of the cooling medium in the first flow channel. Then, along the output direction of the cooling medium in the second flow channel, since the cross-sectional area of the second flow channel increases in sequence, a gradually expanding structure of the second flow channel is realized, enabling the flow rate of the cooling medium in the second flow channel to gradually increase, which is beneficial to the smooth discharge of the cooling medium from the heat exchange structure, and reduces the resistance loss brought by the gradually expanding design itself.

[0089] An embodiment of the present application further provides an electrical device, which includes the battery pack or the heat exchange structure described above.

[0090] Exemplarily, in an embodiment of the present application, the electrical device may be a vehicle, an energy storage cabinet, an aircraft, etc., and the specific type of the electrical device may not be limited in the embodiment of the present application. The vehicle may specifically include a small car, a medium-sized vehicle, a sedan, a truck, a trailer, a CDV (CXr Derived VXn, a van based on a sedan platform), an MPV (multi-Purpose Vehicles), an SUV (Sport Utility Vehicles), etc. The embodiment of the present application may not limit this.

[0091] The electrical device described in the embodiment of the present application may have at least the following advantages:

[0092] In an embodiment of the present application, the electrical device includes the battery pack or the heat exchange structure, and the battery pack includes a battery cell module and the heat exchange structure; the heat exchange structure is connected to the battery cell module, and the heat exchange structure includes: a first cover plate and a second cover plate arranged at intervals, and a flow channel plate connected between the first cover plate and the second cover plate; wherein, the flow channel plate includes a first side close to the first cover plate and a second side close to the second cover plate, the first side is provided with a plurality of first grooves recessed towards the second cover plate, the second side is provided with a plurality of second grooves recessed towards the first cover plate, and the first grooves and the second grooves are arranged alternately; the first grooves and the first cover plate enclose a first flow channel, and the second grooves and the second cover plate enclose a second flow channel; along the flow direction of the cooling medium in the first flow channel, the cross-sectional area of the first flow channel increases sequentially; along the flow direction of the cooling medium in the second flow channel, the cross-sectional area of the second flow channel increases sequentially. In this way, a plurality of first flow channels are formed between the first side of the flow channel plate and the first cover plate through the first grooves, and a plurality of second flow channels are formed between the second side of the flow channel plate and the second cover plate through the second grooves, greatly increasing the flow area of the cooling medium, enabling the cooling medium flowing in the first flow channel on the first side of the flow channel plate to cool the battery pack. At the same time, the cooling medium flowing in the second flow channel on the second side of the flow channel plate can also cool the battery pack, enabling both sides of the flow channel plate to achieve cooling and heat dissipation of the battery pack, increasing the heat exchange area of the cooling medium, improving the space utilization rate of the flow channel plate, and enhancing the heat exchange effect of the heat exchange structure. It avoids the interval distribution of multiple flow channels caused by the interval setting of multiple grooves, eliminates the gaps existing between adjacent two flow channels, and increases the effective heat exchange area of the cooling medium. Since the cross-sectional area of the first flow channel increases sequentially, a gradually expanding structure of the first flow channel is realized, enabling the flow rate of the cooling medium in the first flow channel to gradually increase. Thus, when part of the cooling medium in the first flow channel vaporizes due to heat exchange to form a gas-liquid mixture, the gradually expanding structure of the first flow channel reduces the flow velocity of the above gas-liquid mixture, reduces the acceleration pressure drop caused by the acceleration of the cooling medium flow, and reduces the flow resistance of the cooling medium in the first flow channel. Then, along the output direction of the cooling medium in the second flow channel, since the cross-sectional area of the second flow channel increases sequentially, a gradually expanding structure of the second flow channel is realized, enabling the flow rate of the cooling medium in the second flow channel to gradually increase, which is conducive to the smooth discharge of the cooling medium from the heat exchange structure and reduces the resistance loss brought by the gradually expanding design itself.

[0093] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean 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 utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0094] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A heat exchange structure, characterized in that, The heat exchange structure includes: a first cover plate and a second cover plate arranged at intervals, and a flow channel plate connected between the first cover plate and the second cover plate; wherein, The flow channel plate includes a first side close to the first cover plate and a second side close to the second cover plate. The first side is provided with a plurality of first grooves recessed towards the second cover plate, and the second side is provided with a plurality of second grooves recessed towards the first cover plate. The first grooves and the second grooves are arranged alternately; The first groove and the first cover plate enclose a first flow channel, and the second groove and the second cover plate enclose a second flow channel; Along the flow direction of the cooling medium in the first flow channel, the cross-sectional area of the first flow channel increases sequentially; Along the flow direction of the cooling medium in the second flow channel, the cross-sectional area of the second flow channel increases sequentially.

2. The heat exchange structure according to claim 1, wherein The liquid inlet end of the first flow channel and the liquid outlet end of the second flow channel are located on the same side of the heat exchange structure. The liquid outlet end of the first flow channel and the liquid inlet end of the second flow channel are located on the same side of the heat exchange structure. The liquid outlet ends of two adjacent first flow channels and the liquid inlet ends of the second flow channels are communicated, so that the flow directions of the cooling medium in the first flow channel and the cooling medium in the second flow channel are opposite.

3. The heat exchange structure according to claim 2, wherein The heat exchange structure further includes a flow dividing part arranged at the liquid inlet end of the first flow channel. The inside of the flow dividing part has a flow dividing cavity, and an inlet communicated with the flow dividing cavity is arranged on the flow dividing part. The liquid inlet ends of a plurality of the first flow channels are all communicated with the flow dividing cavity; and / or, The heat exchange structure further includes a flow collecting part arranged at the liquid outlet end of the second flow channel. The inside of the flow collecting part has a flow collecting cavity, and an outlet communicated with the flow collecting cavity is arranged on the flow collecting part. The liquid outlet ends of a plurality of the second flow channels are all communicated with the flow collecting cavity.

4. The heat exchange structure according to claim 3, wherein The flow dividing cavity includes a plurality of sub-flow dividing cavities arranged at intervals. The plurality of sub-flow dividing cavities are communicated with each other. The plurality of sub-flow dividing cavities are arranged in one-to-one correspondence with the plurality of first flow channels. Each sub-flow dividing cavity is communicated with the liquid inlet end of the corresponding first flow channel; Along the flow direction of the cooling medium in the flow dividing cavity, the volumes of the plurality of sub-flow dividing cavities decrease sequentially.

5. The heat exchange structure according to claim 3, characterized in that, The flow collecting cavity includes a plurality of sub-flow collecting cavities arranged at intervals. The plurality of sub-flow collecting cavities are communicated with each other. The plurality of sub-flow collecting cavities are arranged in one-to-one correspondence with the plurality of second flow channels. Each sub-flow collecting cavity is communicated with the liquid outlet end of the corresponding second flow channel; Along the flow direction of the cooling medium in the flow collecting cavity, the volumes of the plurality of sub-flow collecting cavities increase sequentially.

6. The heat exchange structure according to any one of claims 3 to 5, characterized in that, The inlet and the outlet are arranged adjacent to each other; or, The inlet and the outlet are symmetrically arranged about the central axis of the heat exchange structure.

7. The heat exchange structure according to any one of claims 3 to 5, characterized in that The flow channel plate, the flow dividing part and the flow collecting part are of an integrally formed structure.

8. The heat exchange structure according to claim 2, wherein, The heat exchange structure further includes a turning part arranged at the liquid outlet end of the first flow channel and the liquid inlet end of the second flow channel. The turning part is provided with a cavity, and the cavity is respectively communicated with the liquid outlet end of the first flow channel and the liquid inlet end of the second flow channel.

9. The heat exchange structure according to claim 8, wherein, An opening is provided on one side of the flow channel plate close to the liquid outlet end of the first flow channel and the liquid inlet end of the second flow channel, and the first cover plate and the second cover plate corresponding to the opening enclose to form the turning part.

10. The heat exchange structure according to claim 8, characterized in that, On one side close to the turning part, the cross-sectional area of the first flow channel is the same as that of the second flow channel.

11. The heat exchange structure according to any one of claims 1-5 or any one of claims 8-10, characterized in that, A plurality of the first flow channels are symmetrically distributed relative to the central axis of the heat exchange structure, and a plurality of the second flow channels are symmetrically distributed relative to the central axis of the heat exchange structure.

12. The heat exchange structure according to any one of claims 1 - 5 or any one of claims 8 - 10, characterized in that, The side wall of the first groove is inclined relative to the horizontal plane, and the inclination angle of the side wall of the first groove is any value in the range of 0.5 - 1°.

13. The heat exchange structure according to any one of claims 1 - 5 or any one of claims 8 - 10, characterized in that, The side wall of the second groove is inclined relative to the horizontal plane, and the inclination angle of the side wall of the second groove is any value in the range of 0.5 - 1°.

14. The heat exchange structure according to any one of claims 1 - 5 or any one of claims 8 - 10, characterized in that, A first skirt is provided at the edge of the first cover plate, a second skirt is provided at the position of the second cover plate corresponding to the first skirt, and a third skirt is provided on the flow channel plate between the first skirt and the second skirt; The third skirt is welded to the first skirt and the second skirt respectively.

15. The heat exchange structure according to any one of claims 1 - 5 or any one of claims 8 - 10, characterized in that, A microstructure is provided on the surface of at least one of the first cover plate, the second cover plate, and the flow channel plate, and the microstructure is located in the first flow channel and / or the second flow channel.

16. The heat exchange structure according to any one of claims 1 - 5 or any one of claims 8 - 10, characterized in that, The cross-sectional shape of the first flow channel is at least one of a trapezoid, a rectangle, or an arc, and the cross-sectional shape of the second flow channel is at least one of a trapezoid, a rectangle, or an arc.

17. A battery pack, characterized in that, The battery pack includes a battery cell module and the heat exchange structure according to any one of claims 1 - 16; The heat exchange structure is connected to the battery cell module.

18. An electrical device, characterized in that, The electrical device includes the battery pack according to claim 17, or the heat exchange structure according to any one of claims 1 - 16.

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