Cooling device, battery pack and electric equipment

Abstract

The embodiment of the utility model provides a cooling device, a battery pack and electric equipment, and relates to the technical field of energy storage. The cooling device comprises a cooling plate, a first heat exchange area is arranged in the middle of the cooling plate, and a first phase change material is arranged at the position, opposite to the first heat exchange area, in the cooling plate; a flow channel is further arranged in the cooling plate and at least located on one side of the first phase change material. The flow channel is used as a flowing channel of the cooling fluid, the first phase change material and the cooling fluid are coupled, and the cooling effect of the cooling device can be guaranteed. The first phase change material is arranged in the middle of the cooling plate, and the flow channel is close to the end part of the cooling plate, so that the first phase change material can cool a low-heat area of the battery cell module, the cooling fluid can cool a high-heat area of the battery cell module, the temperature difference between parts of the battery cell module is reduced, and the temperature uniformity of the battery cell module is improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of energy storage, and particularly to a cooling device, a battery pack and an electrical equipment. Background Art

[0002] With the rapid development of economy and technology, the application of battery packs is becoming more and more extensive. A battery pack is a power source that provides power for electrical equipment. During its operation, a large amount of heat is often generated, causing the temperature to rise. If the large amount of heat generated by the battery pack cannot be dissipated in time and the temperature of the battery pack continues to be too high, the safety and reliability of the battery pack will be reduced, the service life of the battery pack will be greatly shortened, and even safety accidents may occur. Therefore, it is necessary to cool down the battery pack.

[0003] Currently, the cooling methods of battery packs include air cooling and liquid cooling. The cooling medium of the air cooling method is air, and the cooling efficiency is low and the heat dissipation effect is poor. The cooling medium of the liquid cooling method is liquid, and its cooling efficiency is high and the heat dissipation effect is good. However, the temperature uniformity of the battery pack is poor. Utility Model Content

[0004] The embodiments of the present application provide a cooling device, a battery pack and an electrical equipment, which are used to improve the heat dissipation effect and temperature uniformity of the battery pack.

[0005] The embodiments of the present application provide the following technical solutions:

[0006] In the first aspect of the embodiments of the present application, a cooling device is provided, including:

[0007] A cooling plate, the middle part of the cooling plate has a first heat exchange area, and a first phase change material is arranged at a position in the cooling plate opposite to the first heat exchange area; a flow channel is further arranged in the cooling plate, and the flow channel is at least on one side of the first phase change material.

[0008] In a possible implementation manner, the cooling plate further has a second heat exchange area and a third heat exchange area, the first heat exchange area is arranged between the second heat exchange area and the third heat exchange area, and the flow channel includes a first flow channel and a second flow channel;

[0009] At least part of the position in the cooling plate opposite to the second heat exchange area is provided with the first flow channel, and at least part of the position in the cooling plate opposite to the third heat exchange area is provided with the second flow channel.

[0010] In a possible implementation manner, the first flow channel and the second flow channel are arranged in parallel.

[0011] In a possible implementation, a first flow channel is provided at a partial position in the cooling plate opposite to the second heat exchange area, a second phase change material is provided at a partial position in the cooling plate opposite to the second heat exchange area, and the first flow channel is disposed around the outer periphery of the second phase change material.

[0012] In a possible implementation, a second flow channel is provided at a partial position in the cooling plate opposite to the third heat exchange area, a third phase change material is provided at a partial position in the cooling plate opposite to the third heat exchange area, and the second flow channel is disposed around the outer periphery of the third phase change material.

[0013] In a possible implementation, the number of branches of the first flow channel corresponding to the side of the second heat exchange area away from the first heat exchange area is greater than the number of branches of the first flow channel corresponding to the side of the second heat exchange area close to the first heat exchange area;

[0014] and / or, the number of branches of the second flow channel corresponding to the side of the third heat exchange area away from the first heat exchange area is greater than the number of branches of the second flow channel corresponding to the side of the third heat exchange area close to the first heat exchange area.

[0015] In a possible implementation, the cooling plate includes a temperature equalizing plate and a flow channel plate which are oppositely arranged;

[0016] A channel and a receiving groove are provided on the surface of the temperature equalizing plate facing the flow channel plate. The surface of the channel and the temperature equalizing plate enclose to form the flow channel, and the surface of the receiving groove and the temperature equalizing plate enclose to form a receiving cavity, and the first phase change material is filled in the receiving cavity;

[0017] Alternatively, a receiving cavity is formed inside the temperature equalizing plate, the first phase change material is filled in the receiving cavity, a channel is provided on the surface of the flow channel plate facing the temperature equalizing plate, and the surface of the channel and the temperature equalizing plate enclose to form the flow channel.

[0018] In a possible implementation, one of the flow channel plate and the temperature equalizing plate is further provided with a filling port, a liquid inlet and a liquid outlet;

[0019] The filling port is communicated with the receiving cavity, and both the liquid inlet and the liquid outlet are communicated with the flow channel.

[0020] A second aspect of the embodiments of the present application provides a battery pack, including: a battery cell module, and the cooling device as described above;

[0021] The cooling device is disposed on at least one side of the battery cell module, and the first heat exchange area is opposite to the middle of the battery cell module.

[0022] In a possible implementation, pole columns are provided at both ends of the battery cell module, and the second heat exchange area and the third heat exchange area of the cooling device are respectively opposite to the pole columns.

[0023] A third aspect of the embodiments of the present application provides an electrical device, including the battery pack as described above, or including an electrical device and the above-mentioned cooling device, and the cooling device is used to cool the electrical device.

[0024] In the cooling device, battery pack and electrical device provided by the embodiments of the present application, the cooling device includes a cooling plate. The middle of the cooling plate has a first heat exchange area, and a first phase change material is arranged at a position in the cooling plate opposite to the first heat exchange area; a flow channel is further arranged in the cooling plate, and the flow channel is at least on one side of the first phase change material. Using the flow channel as the flow channel of the cooling fluid to couple the first phase change material and the cooling fluid can ensure the cooling effect of the cooling device. The first phase change material is arranged in the cooling plate, and there is no need to additionally increase the accommodating plate for the first phase change material, which can save costs and space and reduce power consumption. The first phase change material is arranged in the middle of the cooling plate, and the flow channel is close to the end of the cooling plate, so that the first phase change material can cool the low heat area of the battery cell module, and the cooling fluid can cool the high heat area of the battery cell module. The cooling effect of the first phase change material is lower than that of the cooling fluid, and the cooling capacity of the cooling plate matches the heat generation distribution of the battery cell module, avoiding the large temperature difference of the battery cell module caused by the heat exchange of the cooling fluid in the low heat area, thereby reducing the temperature difference between different parts of the battery cell module and improving the temperature uniformity of the battery cell module.

[0025] In addition to the technical problems solved by the embodiments of the present application, the technical features constituting the technical solutions, and the beneficial effects brought by these technical features of the technical solutions described above, other technical problems that can be solved by the cooling device, battery pack and electrical device provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought by these technical features will be further described in detail in the specific implementation manner. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0027] Figure 1 It is a schematic diagram of the battery cell module and the cooling device provided by the embodiments of the present application;

[0028] Figure 2 It is a schematic diagram of the battery cell provided by the embodiments of the present application;

[0029] Figure 3 Top view of the battery cell module and the cooling device provided by the embodiment of the present application;

[0030] Figure 4 Schematic diagram of the cooling device provided by the embodiment of the present application;

[0031] Figure 5 Schematic diagram of the cooling plate and the heat spreader provided by the embodiment of the present application;

[0032] Figure 6 Schematic diagram of the flow of the cooling fluid provided by the embodiment of the present application.

[0033] Explanation of reference numerals:

[0034] 10 - Battery cell; 11 - Terminal;

[0035] 12 - High - heat area; 13 - Low - heat area;

[0036] 20 - Cooling plate; 21 - Heat spreader;

[0037] 22 - Flow channel plate; 31 - First phase - change material;

[0038] 32 - Second phase - change material; 33 - Third phase - change material;

[0039] 41 - First flow channel; 42 - Second flow channel;

[0040] 43 - First branch; 44 - Second branch;

[0041] 45 - Third branch; 51 - First heat - exchange area;

[0042] 52 - Second heat - exchange area; 53 - Third heat - exchange area;

[0043] 54 - Filling port; 61 - Liquid inlet pipe;

[0044] 62 - Liquid outlet pipe. Detailed implementation manners

[0045] In the related art, the temperature uniformity of the battery pack is poor. The reason is that: the heat generation of the battery pack is uneven, and the heat generation at its end is usually greater than that in the middle, that is, there are high - heat areas and low - heat areas in the battery pack. The battery pack adopts a liquid - cooling method. The heat - exchange capacity of the cooling fluid is strong, which can ensure the cooling effect of the high - heat area. However, when the cooling fluid exchanges heat with the low - heat area, the temperature of the low - heat area is further reduced, resulting in a large temperature difference from the high - heat area.

[0046] In view of the above technical problems, an embodiment of the present application provides a cooling device, a battery pack, and an electrical device. The cooling device includes a cooling plate. The middle of the cooling plate has a first heat exchange area. A first phase change material is arranged at a position in the cooling plate opposite to the first heat exchange area. At least one side of the first phase change material is provided with a flow channel. By arranging the first phase change material in the middle of the cooling plate and the flow channel near the end of the cooling plate, the first phase change material can cool the low-heat area of the battery cell module, and the cooling fluid can cool the high-heat area of the battery cell module, so that the cooling capacity of the cooling plate matches the heat generation distribution of the battery cell module. While ensuring the cooling effect, it avoids the large temperature difference of the battery cell module caused by the heat exchange of the cooling fluid in the low-heat area, thereby reducing the temperature difference between different parts of the battery cell module and improving the temperature uniformity of the battery cell module.

[0047] In order to make the above objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0048] An embodiment of the present application provides an electrical device, which may include a television, an electronic watch, an e-book, a desktop computer, a laptop computer, a tablet computer, a mobile phone, an AR device (Augmented Reality), or a VR device (Virtual Reality), etc. It may also include electrical devices such as electric vehicles, electric ships, and electric tools. The present application does not make specific limitations on this.

[0049] The electrical device includes a battery pack, or the electrical device includes an electrical device and a cooling device. A battery pack refers to a device that can convert chemical energy into electrical energy and provides electrical energy for an electronic device. The battery pack can be a Cell To Pack (CTP) battery pack, which can improve the energy density, reduce costs, and reduce the layout space. The electrical device can be electrical components, etc., or other devices.

[0050] Among them, the battery pack may include a battery cell module and a cooling device. The cooling device and the battery cell module may be arranged opposite to each other in a first direction, and the cooling device is arranged on at least one side of the battery cell module to dissipate heat from the battery cell module. Exemplarily, the first direction is Figure 1 the Z direction shown in the figure, and the cooling device is arranged on the bottom side and / or the top side of the battery cell module. When the cooling device is arranged on the bottom side of the battery cell module, it can not only cool the battery cell module but also support the battery cell module.

[0051] Refer toFigure 1 and Figure 2 The battery cell module includes a plurality of battery cells 10 arranged in the second direction. The battery cells 10 are used to store and release electric energy and are the core components of the battery pack. The second direction intersects with the first direction, for example, is perpendicular. The second direction is, for example, the X direction as shown in Figure 1 . The plurality of battery cells 10 are connected in series, which can increase the capacitance of the battery cell module. Each battery cell 10 can be rectangular or in other shapes, and the embodiments of the present application are not limited thereto. The cooling device faces all the plurality of battery cells 10, can dissipate heat from all the plurality of battery cells 10, can improve the heat dissipation effect of the battery cell module, and at the same time reduce the temperature difference between the battery cells 10 and improve the temperature uniformity of the battery cell module.

[0052] Each battery cell 10 can be a side-outlet terminal battery cell, that is, the terminal 11 is located on the side of the battery cell 10. Among them, the terminal 11 is located on at least one side of the battery cell 10 along the third direction. The third direction intersects with both the second direction and the first direction, for example, is perpendicular. The third direction is, for example, the Y direction as shown in Figure 1 . Exemplarily, there are two terminals 11, and the two terminals 11 are respectively located at opposite ends of the battery cell 10 along the third direction, that is, the terminals 11 are arranged at both ends of the battery cell module, and each terminal 11 and each battery cell 10 face the cooling device. Taking Figure 1 the shown direction as an example, the plurality of battery cells 10 are arranged left and right, the terminals 11 are located at the front end and the rear end of the corresponding battery cells 10, and the cooling device is located at the bottom side of the battery cells 10.

[0053] Referring to Figure 2 , during the operation of the battery cell 10, more heat is generated at one end of the battery cell 10 adjacent to the terminal 11, and relatively less heat is generated in other areas of the battery cell 10. In the example where terminals 11 are provided at both ends of the battery cell 10, high-heat areas 12 are formed at both ends of the battery cell 10, and a low-heat area 13 is formed in the middle of the battery cell 10. The plurality of battery cells 10 are arranged in the second direction, and the high-heat areas 12 of each battery cell 10 are arranged in the second direction, so that high-heat areas are formed at both ends of the battery cell module. Correspondingly, the low-heat areas 13 of each battery cell 10 are arranged in the second direction, so that a low-heat area is formed in the middle of the battery cell module.

[0054] It can be understood that in the example where a terminal 11 is provided at one end of the battery cell 10, a high-heat area 12 is formed at the end of the battery cell 10 adjacent to the terminal 11, and a low-heat area 13 is formed in the middle and the other end of the battery cell 10. Correspondingly, a high-heat area is formed at the corresponding end of the battery cell module, and a low-heat area is formed in the middle and the other end of the battery cell module.

[0055] Referring to Figure 1 , Figure 3 and Figure 4, the cooling device includes a cooling plate 20. The middle part of the cooling plate 20 has a first heat exchange area 51, and a first phase change material 31 is arranged at a position in the cooling plate 20 opposite to the first heat exchange area 51. A flow channel is also arranged in the cooling plate 20, and the flow channel is at least on one side of the first phase change material 31. The flow channel allows a cooling fluid to pass through, and the heat exchange with the battery cell module is enhanced by the flow of the cooling fluid.

[0056] The flow channel is arranged on at least one side of the first phase change material 31, which means that the flow channel is arranged on one side of the first phase change material 31 or on opposite sides. The arrangement position of the flow channel matches the arrangement position of the pole 11. Exemplarily, the poles 11 are arranged at both ends of the battery cell module, and the flow channels are arranged on both sides of the first phase change material 31; the poles 11 are arranged at one end of the battery cell module, and the flow channel is arranged on one side of the first phase change material 31 so that the poles 11 are opposite to the flow channels. In this way, flow channels are correspondingly arranged near the poles 11, and the flow channels are used to cool the area near the poles 11, which can improve the temperature uniformity of the battery cell module.

[0057] Among them, the cooling fluid includes but is not limited to one or more of water, ethylene glycol, nanofluid, and refrigerant. The first phase change material 31 includes but is not limited to one or more of solid-solid phase change materials or solid-liquid phase change materials. By arranging the first phase change material 31 in the middle of the cooling plate 20 and arranging a flow channel beside the first phase change material 31, and using the flow channel as the flow channel of the cooling fluid, the first phase change material 31 and the cooling fluid can be coupled to achieve the cooling function of the cooling device.

[0058] In addition, the first phase change material 31 is arranged in the middle of the cooling plate 20, and there is no need to additionally increase a receiving plate for the first phase change material 31, which can save costs and space and reduce power consumption. The first phase change material 31 absorbs and stores the heat generated in the middle of the battery cell module. The flow channel is arranged on at least one side of the first phase change material 31, and the cooling fluid in the flow channel cools the end of the battery cell module and exchanges heat with the heat absorbed by the first phase change material 31 to complete the heat dissipation of the battery cell module.

[0059] In this way, the first phase change material 31 can cool the low-heat area of the battery cell module, and the cooling fluid can cool the high-heat area of the battery cell module. The cooling effect of the first phase change material 31 is lower than that of the cooling fluid, so that the cooling capacity of the cooling plate 20 matches the heat generation amount of the battery cell module, avoiding large temperature differences in the battery cell module caused by heat exchange of the cooling fluid in the low-heat area, thereby reducing the temperature difference between different parts of the battery cell module and improving the temperature uniformity of the battery cell module. That is, by enhancing the heat exchange at at least one end of the battery cell module and appropriately reducing the heat exchange in the middle of the battery cell module, the temperature uniformity of the battery cell module can be improved.

[0060] Continue to refer to Figure 3 and Figure 4, the cooling plate 20 further has a second heat exchange area 52 and a third heat exchange area 53, and a first heat exchange area 51 is provided between the second heat exchange area 52 and the third heat exchange area 53. The second heat exchange area 52, the first heat exchange area 51, and the third heat exchange area 53 are arranged in sequence. Exemplarily, the second heat exchange area 52, the first heat exchange area 51, and the third heat exchange area 53 are arranged at intervals in the third direction, and the third direction is, for example, Figure 3 and Figure 4 the Y direction shown in. In this way, the second heat exchange area 52 and the third heat exchange area 53 are respectively opposite to the two ends of the battery cell module, and the first heat exchange area 51 is opposite to the middle of the battery cell module. In an example where pole columns 11 are provided at both ends of the battery cell module, the second heat exchange area 52 and the third heat exchange area 53 are respectively opposite to the pole columns 11.

[0061] The flow channel includes a first flow channel 41 and a second flow channel 42. At least a part of the position in the cooling plate 20 opposite to the second heat exchange area 52 is provided with the first flow channel 41, and at least a part of the position in the cooling plate 20 opposite to the third heat exchange area 53 is provided with the second flow channel 42. Among them, the first flow channel 41 can be provided at all positions in the cooling plate 20 opposite to the second heat exchange area 52, that is, the second heat exchange area 52 is only opposite to the first flow channel 41. The first flow channel 41 can also be provided at a part of the position in the cooling plate 20 opposite to the second heat exchange area 52, that is, the second heat exchange area 52 is partially opposite to the first flow channel 41.

[0062] The setting of the second flow channel 42 in the third heat exchange area 53 can refer to the setting of the first flow channel 41 in the second heat exchange area 52, and will not be elaborated here. It can be understood that the setting of the second flow channel 42 in the third heat exchange area 53 and the setting of the first flow channel 41 in the second heat exchange area 52 are independent of each other. For example, the first flow channel 41 is opposite to all positions of the second heat exchange area 52, and the second flow channel 42 is opposite to a part of the positions of the third heat exchange area 53.

[0063] In some possible examples, a part of the position in the cooling plate 20 opposite to the second heat exchange area 52 is provided with the first flow channel 41, a part of the position in the cooling plate 20 opposite to the second heat exchange area 52 is provided with the second phase change material 32, and the first flow channel 41 is arranged around the outer periphery of the second phase change material 32. The second phase change material 32 includes, but is not limited to, one or more of solid-solid phase change materials or solid-liquid phase change materials.

[0064] The second phase change material 32 is disposed within the cooling plate 20. Without the need to additionally provide a receiving plate for the second phase change material 32, cost and space can be saved, and power consumption can be reduced. The second phase change material 32 is located on one side of the first phase change material 31 and can absorb and store the heat at the end of the battery cell module. The first flow channel 41 circumferentially surrounds the second phase change material 32 entirely. On the one hand, it can cool the corresponding end of the battery cell module, and on the other hand, it can also cool the second phase change material 32 and the first phase change material 31, realizing heat exchange of the battery cell module and improving the cooling effect and temperature uniformity of the battery cell module.

[0065] In some possible examples, a second flow channel 42 is disposed at a partial position within the cooling plate 20 opposite to the third heat exchange region 53, and a third phase change material 33 is disposed at a partial position within the cooling plate 20 opposite to the third heat exchange region 53, and the second flow channel 42 is disposed around the outer periphery of the third phase change material 33. The third phase change material 33 includes, but is not limited to, one or more of solid-solid phase change materials or solid-liquid phase change materials. The third phase change material, the second phase change material, and the first phase change material may be the same, partially the same, or all different, and can be selected according to the needs of the battery cell module.

[0066] The third phase change material 33 is disposed within the cooling plate 20. Without the need to additionally provide a receiving plate for the third phase change material 33, cost and space can be saved, and power consumption can be reduced. The third phase change material 33 is located on one side of the first phase change material 31 and can absorb and store the heat at the end of the battery cell module. The second flow channel 42 circumferentially surrounds the third phase change material 33 entirely. On the one hand, it can cool the corresponding end of the battery cell module, and on the other hand, it can also cool the third phase change material 33 and the first phase change material 31, realizing heat exchange of the battery cell module and improving the cooling effect and temperature uniformity of the battery cell module.

[0067] Continue to refer to Figure 3 and Figure 4 , the first flow channel 41 and the second flow channel 42 are arranged in parallel. Among them, one ends of the first flow channel 41 and the second flow channel 42 are communicated and are communicated with the liquid inlet of the cooling plate 20. The other ends of the first flow channel 41 and the second flow channel 42 are communicated and are communicated with the liquid outlet of the cooling plate 20. In this way, the first flow channel 41 and the second flow channel 42 can form a closed loop, reducing the problem of poor sealing.

[0068] Refer to Figure 6 , when the cooling plate 20 cools the battery cell module, the cooling fluid enters through the liquid inlet and is divided into two branches, respectively entering the first flow channel 41 and the second flow channel 42, and flowing in a direction away from the first heat exchange region 51. First, the two ends of the battery cell module are cooled, and then the middle part of the battery cell module is cooled, and they converge to flow out at the liquid outlet, completing heat exchange with the battery cell module.

[0069] To further improve the cooling effect and temperature uniformity, refer toFigure 4 The number of branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 far from the first heat exchange area 51 is greater than the number of branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 close to the first heat exchange area 51; and / or, the number of branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 far from the first heat exchange area 51 is greater than the number of branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 close to the first heat exchange area 51.

[0070] Continue to refer to Figure 4 Both the first flow channel 41 and the second flow channel 42 are formed with a plurality of branches. On the one hand, it can increase the cooling area, and on the other hand, it can increase the flow rate and enhance the cooling effect. Among them, the more branches there are, the larger the cooling area and the faster the flow rate. And the number of branches of the first flow channel 41 and the number of branches of the second flow channel 42 gradually transition along the flow direction of the cooling liquid.

[0071] As Figure 4 shown, the number of branches of the first flow channel 41 corresponding to both sides of the second heat exchange area 52 is greater than the number of branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 adjacent to the first heat exchange area 51 ( Figure 4 the upper side shown), and less than the number of branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 far from the first heat exchange area 51 ( Figure 4 the lower side shown). The number of branches of the second flow channel 42 corresponding to both sides of the third heat exchange area 53 is greater than the number of branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 adjacent to the first heat exchange area 51 ( Figure 4 the upper side shown), and less than the number of branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 far from the first heat exchange area 51 ( Figure 4 the lower side shown).

[0072] Exemplarily, the number of branches corresponding to both sides of the second heat exchange area 52 is two, the number of branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 adjacent to the first heat exchange area 51 is one, which is less than the number of branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 far from the first heat exchange area 51, which is three. The number of branches of the second flow channel 42 corresponding to both sides of the third heat exchange area 53 is two, the number of branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 adjacent to the first heat exchange area 51 is one, and the number of branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 far from the first heat exchange area 51 is three.

[0073] With such a setting, the branch of the first flow channel 41 corresponding to one side of the second heat exchange area 52 is branched, so that the number of branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 far from the first heat exchange area 51 can be relatively increased. Moreover, the branches of the first flow channel 41 corresponding to the other side of the second heat exchange area 52 are converged, so that the number of branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 adjacent to the first heat exchange area 51 is relatively reduced. The first flow channels 41 on both sides of the second heat exchange area 52 can be coordinated to adapt to the first flow channel 41 corresponding to the side of the second heat exchange area 52 adjacent to the first heat exchange area 51 and the first flow channel 41 corresponding to the side of the second heat exchange area 52 far from the first heat exchange area 51.

[0074] Similarly, the branch of the second flow channel 42 corresponding to one side of the third heat exchange area 53 is branched, so that the number of branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 far from the first heat exchange area 51 can be relatively increased. Moreover, the branches of the second flow channel 42 corresponding to the other side of the third heat exchange area 53 are converged, so that the number of branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 adjacent to the first heat exchange area 51 is relatively reduced. The second flow channels 42 on both sides of the third heat exchange area 53 can be coordinated to adapt to the second flow channel 42 corresponding to the side of the third heat exchange area 53 adjacent to the first heat exchange area 51 and the second flow channel 42 corresponding to the side of the third heat exchange area 53 far from the first heat exchange area 51.

[0075] Furthermore, among the branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 far from the first heat exchange area 51, the branched and converged branches are different; among the branches of the second flow channel 42 corresponding to the side of the third heat exchange area 53 far from the first heat exchange area 51, the branched and converged branches are different. In this way, the uniformity of the cooling liquid mixture and the consistency of the temperature can be improved.

[0076] Taking the first flow channel 41 corresponding to the side of the second heat exchange area 52 far from the first heat exchange area 51 as an example, the branches of the first flow channel 41 corresponding to the side of the second heat exchange area 52 far from the first heat exchange area 51 include three, and along the direction away from the first heat exchange area 51, these three branches are the first branch 43, the second branch 44, and the third branch 45 in sequence. The second branch 44 and the third branch 45 are branched, and the first branch 43 and the second branch 44 are converged.

[0077] In some possible examples, the cooling plate 20 includes a temperature equalizing plate 21 and a flow channel plate 22 arranged oppositely. The surface of the temperature equalizing plate 21 facing the flow channel plate 22 is provided with a channel and a receiving groove. The surface of the channel and the temperature equalizing plate 21 enclose a flow channel, and the surface of the receiving groove and the temperature equalizing plate 21 enclose a receiving cavity, and the receiving cavity is filled with a first phase change material 31.

[0078] Among them, the channel, the receiving groove, etc. are all arranged on the flow channel plate 22 and are located on the surface of the flow channel plate 22 facing the heat dissipation plate 21. The channel is used to form a flow channel, and the receiving groove is used to receive the first phase change material 31. The channel and the receiving groove are independent of each other and are not connected to each other. By arranging both the channel and the receiving cavity on the flow channel plate 22, on the one hand, it is convenient for processing, and on the other hand, it can avoid the flow channel and the receiving cavity being connected due to the misalignment of the heat dissipation plate 21 and the flow channel plate 22.

[0079] In some possible implementation manners, the heat dissipation plate 21 can be a metal flat plate with a certain thickness, and the flow channel plate 22 can be formed with channels and receiving grooves by stamping, machining or other processes. The heat dissipation plate 21 and the flow channel plate 22 are integrated by brazing, so that the surface of the channel and the surface of the heat dissipation plate 21 opposite to the channel enclose to form a flow channel, and the surface of the receiving groove and the surface of the heat dissipation plate 21 opposite to the receiving groove enclose to form a receiving cavity, and the first phase change material 31 is arranged in the receiving cavity. Among them, the number of receiving cavities matches the number of heat exchange areas, and the first heat exchange area 51, the second heat exchange area 52 and the third heat exchange area 53 respectively correspond to one receiving cavity.

[0080] In some other possible examples, the channel and the receiving groove can be respectively arranged on the heat dissipation plate 21 and the flow channel plate 22. For example, the channel is arranged on the surface of the heat dissipation plate 21 facing the flow channel plate 22, and the receiving groove is arranged on the surface of the flow channel plate 22 facing the heat dissipation plate 21. The channel and the receiving groove can also be partially arranged on the heat dissipation plate 21 and partially arranged on the flow channel plate 22. The channels on the heat dissipation plate 21 and the channels on the flow channel plate 22 are joined together to form a flow channel, and the receiving grooves on the heat dissipation plate 21 and the receiving grooves on the flow channel plate 22 are joined together to form a receiving cavity. In the above examples, the heat dissipation plate 21 and the flow channel plate 22 need to be aligned to avoid the flow channel and the receiving groove being connected or the two parts of the flow channel / receiving groove being misaligned.

[0081] In other examples, refer to Figure 5 , a receiving cavity is arranged inside the heat dissipation plate 21, that is, the receiving cavity is independently formed inside the heat dissipation plate 21 without cooperating with the flow channel plate 22 to form. The receiving cavity is filled with the first phase change material 31. The surface of the flow channel plate 22 facing the heat dissipation plate 21 is provided with a channel, and the surface of the channel and the heat dissipation plate 21 enclose to form a flow channel. In this way, the heat dissipation plate 21 and the flow channel plate 22 do not need to be aligned to ensure that the flow channel and the receiving groove are not connected. Moreover, the arrangement manners of the receiving cavity and the flow channel are more flexible. For example, the receiving cavity can be located directly above the flow channel.

[0082] In the above several examples, the surface of the flow channel plate 22 facing away from the heat dissipation plate 21 can be a plane or a curved surface. For example, the thickness of the flow channel plate 22 is uniform, that is, the flow channel plate 22 is basically of equal thickness, and a protrusion is formed on the surface of the flow channel plate 22 facing away from the heat dissipation plate 21, and the protrusion is opposite to the channel.

[0083] Refer to Figure 3and Figure 4 One of the flow channel plate 22 and the heat spreader 21 is further provided with a filling port 54, a liquid inlet and a liquid outlet. The filling port 54 is communicated with the accommodating cavity, and both the liquid inlet and the liquid outlet are communicated with the flow channel. Exemplarily, the filling port 54, the liquid inlet and the liquid outlet are all opened on the heat spreader 21, for example, on the surface of the heat spreader 21 facing away from the flow channel plate 22. Such a setting facilitates the processing of the filling port 54, the liquid inlet and the liquid outlet, and facilitates the realization of the communication between the filling port 54 and the accommodating cavity, the communication between the liquid inlet and the flow channel, and the communication between the liquid outlet and the flow channel.

[0084] Wherein, a liquid inlet pipe 61 and a liquid outlet pipe 62 may be respectively welded to the liquid inlet and the liquid outlet, serving as the inflow and outflow channels of the cooling fluid respectively. The number of the filling ports 54 is adapted to the number of the accommodating cavities. For example, each accommodating cavity is correspondingly connected to a filling port 54. The first phase change material 31 / the second phase change material 32 / the third phase change material 33 is filled into the corresponding accommodating cavity through the filling port 54, and after the filling is completed, the filling port 54 is sealed by means of gluing, welding or other methods.

[0085] In summary, the cooling device in the embodiment of the present application includes a cooling plate 20. The middle part of the cooling plate 20 has a first heat exchange area 51, and a first phase change material 31 is arranged at a position in the cooling plate 20 opposite to the first heat exchange area 51; a flow channel is further arranged in the cooling plate 20, and the flow channel is at least located on one side of the first phase change material 31. The first phase change material 31 is arranged in the cooling plate 20, and there is no need to additionally increase a containing plate for the first phase change material 31, which can save cost and space and reduce power consumption. The first phase change material 31 is arranged in the middle of the cooling plate 20, and the flow channel is close to the end of the cooling plate 20, so that the first phase change material 31 can cool the low heat area of the battery cell module, and the cooling fluid can cool the high heat area of the battery cell module. The cooling effect of the first phase change material 31 is lower than that of the cooling fluid, and the cooling capacity of the cooling plate 20 matches the heat generation distribution of the battery cell module, avoiding the large temperature difference of the battery cell module caused by the heat exchange of the cooling fluid in the low heat area 13, thereby reducing the temperature difference between various parts of the battery cell module and improving the temperature uniformity of the battery cell module.

[0086] In the present specification, the embodiments or implementation manners are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts among the embodiments can be referred to each other.

[0087] It should be noted that the embodiments referred to in the specification as "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. may include specific features, structures or characteristics, but not necessarily every embodiment includes such specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Further, when combining specific features, structures or characteristics with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in combination with other embodiments, whether explicitly or implicitly described.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cooling device, characterized in that, Comprising: A cooling plate (20), the middle of the cooling plate (20) has a first heat exchange area (51), and a first phase change material (31) is arranged at a position in the cooling plate (20) opposite to the first heat exchange area (51); a flow channel is further arranged in the cooling plate (20), and the flow channel is at least on one side of the first phase change material (31).

2. The cooling device according to claim 1, wherein, The cooling plate (20) further has a second heat exchange area (52) and a third heat exchange area (53), the first heat exchange area (51) is arranged between the second heat exchange area (52) and the third heat exchange area (53), and the flow channel includes a first flow channel (41) and a second flow channel (42); At least part of the position in the cooling plate (20) opposite to the second heat exchange area (52) is provided with the first flow channel (41), and at least part of the position in the cooling plate (20) opposite to the third heat exchange area (53) is provided with the second flow channel (42).

3. The cooling device according to claim 2, characterized in that, The first flow channel (41) and the second flow channel (42) are arranged in parallel.

4. The cooling device according to claim 2, characterized in that, Part of the position in the cooling plate (20) opposite to the second heat exchange area (52) is provided with the first flow channel (41), part of the position in the cooling plate (20) opposite to the second heat exchange area (52) is provided with a second phase change material (32), and the first flow channel (41) is arranged around the outer periphery of the second phase change material (32).

5. The cooling device according to any one of claims 2-4, characterized in that Part of the position in the cooling plate (20) opposite to the third heat exchange area (53) is provided with the second flow channel (42), part of the position in the cooling plate (20) opposite to the third heat exchange area (53) is provided with a third phase change material (33), and the second flow channel (42) is arranged around the outer periphery of the third phase change material (33).

6. The cooling device according to any one of claims 2-4, characterized in that, The number of branches of the first flow channel (41) corresponding to the side of the second heat exchange area (52) far from the first heat exchange area (51) is greater than the number of branches of the first flow channel (41) corresponding to the side of the second heat exchange area (52) close to the first heat exchange area (51); And / or, the number of branches of the second flow channel (42) corresponding to the side of the third heat exchange area (53) far from the first heat exchange area (51) is greater than the number of branches of the second flow channel (42) corresponding to the side of the third heat exchange area (53) close to the first heat exchange area (51).

7. The cooling device according to any one of claims 1 to 4, characterized in that, The cooling plate (20) includes a temperature equalizing plate (21) and a flow channel plate (22) arranged oppositely; The surface of the temperature equalizing plate (21) facing the flow channel plate (22) is provided with a groove and a receiving groove, the surface of the groove and the temperature equalizing plate (21) enclose to form the flow channel, the surface of the receiving groove and the temperature equalizing plate (21) enclose to form a receiving cavity, and the receiving cavity is filled with the first phase change material (31); Or, a receiving cavity is formed inside the temperature equalizing plate (21), the receiving cavity is filled with the first phase change material (31), the surface of the flow channel plate (22) facing the temperature equalizing plate (21) is provided with a groove, and the surface of the groove and the temperature equalizing plate (21) enclose to form the flow channel.

8. The cooling device according to claim 7, characterized in that, One of the flow channel plate (22) and the heat pipe (21) is further provided with a filling port (54), a liquid inlet, and a liquid outlet; The filling port (54) communicates with the accommodating cavity, and both the liquid inlet and the liquid outlet communicate with the flow channel.

9. A battery pack, characterized in that, Comprising: a battery cell module, and a cooling device according to any one of claims 1-8; The cooling device is disposed on at least one side of the battery cell module, and the first heat exchange region (51) faces the middle of the battery cell module.

10. The battery pack according to claim 9, characterized in that, Both ends of the battery cell module are provided with pole columns (11), and the second heat exchange region (52) and the third heat exchange region (53) of the cooling device face the pole columns (11) respectively.

11. An electrical device, characterized in that, Comprising a battery pack according to claim 9 or 10, or comprising an electrical device and the cooling device according to any one of claims 1-8 above, the cooling device being used to cool the electrical device.

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