Complementary cooling device, liquid cooling system, battery pack and electric equipment

Abstract

The utility model relates to the technical field of battery packs, and provides a complementary cooling device, a liquid cooling system, a battery pack and electric equipment.The complementary cooling device comprises a first liquid cooling plate and a second liquid cooling plate, the first liquid cooling plate and the second liquid cooling plate are arranged in parallel and form a containing space, and the containing space is used for containing a to-be-cooled object; the circulation direction of a cooling medium in the first liquid cooling plate is opposite to the circulation direction of a cooling medium in the second liquid cooling plate; in the flowing direction of the cooling medium, the flow speed of the cooling medium in the first liquid cooling plate and the second liquid cooling plate is gradually increased. According to the scheme, the staggered liquid inlet temperature and liquid outlet temperature can be formed at the two ends of the two side faces of the to-be-cooled object, the heat interaction capacity of the liquid outlet area can be improved, the cooling heat exchange capacity of the to-be-cooled object is improved, and the regional temperature difference is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a complementary cooling device, a liquid cooling system, a battery pack and electrical equipment. Background Art

[0002] At present, most of the liquid cooling plates in battery packs are designed to be placed on the bottom of the battery, and dissipate heat by contacting the bottom of the battery. However, this arrangement has the disadvantages of small heat transfer area and low heat dissipation efficiency, and will cause a large temperature gradient in the height direction of the battery, which will cause a large temperature difference inside the battery. In addition, the design process of the flow channel in most current liquid cooling plates is relatively long. During the process of cooling medium flowing along the liquid cooling plate for heat exchange, the temperature along the way continues to rise due to heating, and its heat exchange capacity continues to decrease. The cooling medium temperature at the inlet of the liquid cooling plate is low and the cooling effect is good, while the cooling medium temperature at the outlet is high and the cooling effect is poor. This ultimately leads to a large temperature difference between the batteries in the inlet and outlet areas. Long-term use will cause the battery consistency to deteriorate, thereby affecting the service life and safety of the entire pack. Utility Model Content

[0003] In order to overcome at least one disadvantage of the above-mentioned prior art, the purpose of the present application is to provide a complementary cooling device, a liquid cooling system, a battery pack and an electrical device.

[0004] The technical means adopted by this application to solve the above technical problems are:

[0005] On the one hand, an embodiment of the present application provides a complementary cooling device, including a first liquid cooling plate and a second liquid cooling plate, wherein the first liquid cooling plate and the second liquid cooling plate are arranged parallel to each other and form a receiving space, wherein the receiving space is used for placing an object to be cooled;

[0006] The flow direction of the cooling medium in the first liquid cooling plate is opposite to the flow direction of the cooling medium in the second liquid cooling plate;

[0007] Along the flow direction of the cooling medium, the flow velocity of the cooling medium in the first liquid cooling plate and the second liquid cooling plate gradually increases.

[0008] In the embodiment scheme of the present application, by setting the flow directions of the cooling medium in the first liquid cooling plate and the second liquid cooling plate to opposite forms, it is possible to form staggered liquid inlet temperatures and liquid outlet temperatures at both ends of the two sides of the object to be cooled; at the same time, by designing the flow rate of the cooling medium in the first liquid cooling plate and the second liquid cooling plate, it is possible to improve the thermal interaction capacity at the liquid outlet area, thereby improving the cooling and heat exchange capacity of the object to be cooled and reducing the regional temperature difference.

[0009] In some embodiments, a plurality of flow channel sections are disposed in the first liquid cooling plate and / or the second liquid cooling plate, and the plurality of flow channel sections are arranged in sequence along the flow direction of the cooling medium;

[0010] Along the flow direction of the cooling medium, the flow area of ​​each flow channel section gradually decreases.

[0011] In the embodiment of the present application, the flow channel section is provided and the flow area of ​​the flow channel section is designed so that the flow velocity of the cooling medium can be gradually increased during the circulation process.

[0012] In some embodiments, a plurality of sub-flow channels are arranged in the flow channel section, and along the flow direction of the cooling medium, the number of the sub-flow channels in each of the flow channel sections gradually increases.

[0013] In the embodiment of the present application, the sub-flow channel is provided in the flow channel section so as to realize a gradual reduction in the flow area of ​​each flow channel section.

[0014] In some embodiments, several flow-disturbing columns are arranged in the flow channel sections, and along the flow direction of the cooling medium, the density of the flow-disturbing columns in each of the flow channel sections gradually increases.

[0015] In the embodiment of the present application, by arranging the spoiler column in the flow channel section, the flow area of ​​each flow channel section can be gradually reduced.

[0016] In some embodiments, the first liquid cooling plate and / or the second liquid cooling plate includes a plurality of sub-cold plates, and the plurality of sub-cold plates are sequentially spliced ​​to form the first liquid cooling plate or the second liquid cooling plate.

[0017] In the embodiment of the present application, by providing the sub-cold plate, it is possible to facilitate the production and processing of the first liquid cooling plate or the second liquid cooling plate.

[0018] In some embodiments, along the flow direction of the cooling medium, the flow area of ​​the cooling medium in the first liquid cooling plate and the second liquid cooling plate gradually decreases.

[0019] In some embodiments, a plurality of heat dissipation ribs are disposed in the first liquid cooling plate and the second liquid cooling plate, and the heat dissipation ribs are extended along the length direction of the first liquid cooling plate and the second liquid cooling plate;

[0020] The surface of the heat dissipation rib is arranged in an inclined manner, and the lower inclined end of the heat dissipation rib is close to the input end of the cooling medium, and the higher inclined end of the heat dissipation rib is close to the output end of the cooling medium.

[0021] In the embodiment of the present application, by providing the heat dissipation ribs, an effect of gradually decreasing flow area can also be formed in the first liquid cooling plate or the second liquid cooling plate.

[0022] On the other hand, the embodiment of the present application provides a liquid cooling system, in which the complementary cooling device as described above is arranged;

[0023] It comprises a plurality of the first liquid cooling plates and a plurality of the second liquid cooling plates, wherein the first liquid cooling plates and the second liquid cooling plates are arranged alternately to form a plurality of the accommodating spaces.

[0024] In the embodiment of the present application, by forming a plurality of the accommodating spaces, it is possible to facilitate the installation and arrangement of more objects to be cooled, thereby achieving overall cooling.

[0025] On the other hand, an embodiment of the present application provides a battery pack, including a plurality of battery cells and a liquid cooling system as described above;

[0026] The width of the accommodating space is adapted to the width or thickness of the battery cell.

[0027] In the embodiment of the present application, by designing the width of the accommodating space, the complementary cooling device can perform heat exchange cooling on the side of the battery core, thereby improving the cooling and heat exchange effect.

[0028] On the other hand, an embodiment of the present application provides an electrical device in which the battery pack as described above is arranged.

[0029] In the embodiment scheme of the present application, by applying the battery pack in an electrical device, it is possible to improve the temperature consistency of the battery cells in the electrical device, so that the state of the battery cells during application can be more stable and reliable, thereby extending the service life of the battery cells and reducing the application cost of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the structure of the complementary cooling device of the present application.

[0032] Figure 2 This is a schematic diagram of the internal structure of a first liquid cooling plate according to an example of the present application.

[0033] Figure 3 This is a schematic diagram of the internal structure of a first liquid cooling plate according to an example of the present application.

[0034] Figure 4 It is a schematic cross-sectional view of a first liquid cooling plate in one example of the present application.

[0035] Figure 5 This is a schematic cross-sectional structural diagram of a first liquid cooling plate in one example of the present application.

[0036] Figure 6 This is a schematic cross-sectional structural diagram of a first liquid cooling plate in one example of the present application.

[0037] Figure 7 This is a schematic diagram of the structure of the liquid cooling system of this application.

[0038] Figure 8 This is a schematic diagram of the structure of the battery pack of this application.

[0039] Marking Description:

[0040] 1-first liquid cooling plate, 11-main channel, 111-sub-channel, 112-spoiler column, 12-first channel section, 13-second channel section, 14-sub-cold plate, 15-heat dissipation ribs, 16-thermal pad;

[0041] 2-second liquid cooling plate; 3-accommodating space; 4-battery cell;

[0042] 5-current collector, 51-liquid inlet, 52-liquid outlet;

[0043] 6-Liquid inlet pipe; 7-Liquid outlet pipe. DETAILED DESCRIPTION

[0044] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention, and the embodiments described are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the art without making creative work are within the scope of protection of the present invention.

[0045] It should be noted that: unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0046] like Figures 1 to 8 As shown, a complementary cooling device is provided in this embodiment, including a first liquid cooling plate 1 and a second liquid cooling plate 2, wherein the first liquid cooling plate 1 and the second liquid cooling plate 2 are arranged parallel to each other, and an accommodating space 3 is formed between the first liquid cooling plate 1 and the second liquid cooling plate 2, and the accommodating space 3 can be used for placing an object to be cooled.

[0047] In this embodiment, a square cell is mainly used as the object to be cooled for illustration. It should be understood that the object to be cooled includes but is not limited to a square cell, for example, a blade cell, a soft-pack cell, or an object with regular sides to be cooled.

[0048] In some embodiments, the first liquid cooling plate 1 and the second liquid cooling plate 2 have the same structural composition. In this embodiment, the first liquid cooling plate 1 is mainly used as an example for structural description.

[0049] As one application example, the flow direction of the cooling medium in the first liquid cooling plate 1 is opposite to the flow direction of the cooling medium in the second liquid cooling plate 2. Figure 1 As shown; in this application form, when the battery cell 4 is placed in the accommodating space 3, due to the different flow directions of the cooling medium in the first liquid cooling plate 1 and the second liquid cooling plate 2, the two side surfaces of the same end of the battery cell 4 will respectively serve as the liquid inlet area and the liquid outlet area of ​​the cooling medium, so that the influence of the relatively high temperature in the liquid outlet area can be reduced by the relatively low temperature in the liquid inlet area, thereby reducing the influence of the reduced cooling effect caused by the temperature rise of the cooling medium due to heat exchange along the way.

[0050] In some embodiments, along the flow direction of the cooling medium, the flow rate of the cooling medium in the first liquid cooling plate 1 and the second liquid cooling plate 2 can be set to be gradually increased.

[0051] By setting the flow directions of the cooling medium in the first liquid cooling plate 1 and the second liquid cooling plate 2 to opposite forms, it is possible to form staggered liquid inlet temperatures and liquid outlet temperatures at both ends of the two sides of the object to be cooled, and by performing cooling and heat exchange on the side, it is possible to control the vertical temperature difference of the object to be cooled, such as the temperature difference in the height direction of the battery cell 4; at the same time, by designing the flow rate of the cooling medium in the first liquid cooling plate 1 and the second liquid cooling plate 2, it is possible to improve the thermal interaction capacity at the liquid outlet area, reduce the temperature difference between the liquid inlet area and the liquid outlet area, thereby improving the cooling and heat exchange capacity of the object to be cooled, reducing the regional temperature difference, and facilitating improving the temperature consistency of the battery cell 4 during application.

[0052] As one application example, along the length direction of the first liquid cooling plate 1, a plurality of flow channel sections are arranged in the first liquid cooling plate 1, and the plurality of flow channel sections are arranged in sequence along the flow direction of the cooling medium; and along the flow direction of the cooling medium, the flow area of ​​each of the flow channel sections gradually decreases. By setting the flow channel sections and designing the flow area of ​​the flow channel sections, the flow velocity of the cooling medium can be gradually increased during the circulation process.

[0053] In some embodiments, along the length direction of the first liquid cooling plate 1 , the plurality of flow channel sections are sequentially arranged and connected to form a straight main flow channel 11 , and the length of the main flow channel 11 is the length of the first liquid cooling plate 1 .

[0054] In some embodiments, along the height direction of the first liquid cooling plate 1, a plurality of the main channels 11 are arranged in parallel in sequence, such as Figure 2 , 3 , 5, and 6. For example, current collectors 5 are respectively provided at both ends of the first liquid cooling plate 1, and the cooling medium is input from the current collector 5 at the liquid inlet end, so as to enter the plurality of main channels 11 synchronously, and flow through the plurality of main channels 11 to the current collector 5 at the liquid outlet end, thereby realizing centralized output.

[0055] In some embodiments, the current collector 5 at the liquid inlet end is provided with a liquid inlet 51, and the current collector 5 at the liquid outlet end is provided with a liquid outlet 52, and the setting height of the liquid inlet 51 is higher than the setting height of the liquid outlet 52. For example, the liquid inlet 51 corresponds to the main flow channel 11 at the highest position in the first liquid cooling plate 1, and the liquid outlet 52 corresponds to the main flow channel 11 at the lowest position. Figure 2 shown.

[0056] In some embodiments, a plurality of sub-channels 111 are provided in the channel section, and along the flow direction of the cooling medium, the number of the sub-channels 111 in each channel section gradually increases. Figure 2As shown, when the flow channel section is provided with two sections, the number of the sub-flow channels 111 in the first flow channel section 12 close to the liquid inlet end is 1, and at this time the first flow channel section 12 is the sub-flow channel 111; and the number of the sub-flow channels 111 in the second flow channel section 13 close to the liquid outlet end can be set to 2, and at this time two sub-flow channels 111 are formed in the second flow channel section 13.

[0057] In some embodiments, the number of sub-channels 111 may correspond to the order of the channel segments; for example, when there is a third channel segment, the number of sub-channels in the third channel segment is set to 3, and so on.

[0058] In some embodiments, the quantitative relationship between the preceding flow path segment and the succeeding flow path segment may be set to an arithmetic progression relationship.

[0059] In some embodiments, the quantitative relationship between the preceding flow channel segment and the succeeding flow channel segment may also be set to a multiple relationship; for example, when there is a third flow channel segment, the number of sub-flow channels in the third flow channel segment is set to 4, and so on.

[0060] By setting the sub-channels 111 in the channel section, the number of the sub-channels 111 will gradually increase along the flow direction of the cooling medium, so that the flow area of ​​each channel section can gradually decrease, thereby achieving an increase in the flow velocity of the cooling medium along the flow process.

[0061] As one application example, a plurality of flow-disturbing columns 112 are arranged in the flow channel section, and along the flow direction of the cooling medium, the density of the flow-disturbing columns 112 in each flow channel section gradually increases, such as Figure 3 At this time, by arranging the spoiler column 112 in the flow channel section, the flow area of ​​each flow channel section can be gradually reduced; moreover, the arrangement of the spoiler column 112 can also facilitate the increase of the interaction area between the cold plate and the cooling medium, and the overall heat exchange effect is better.

[0062] In some embodiments, the spoiler column 112 can be arranged in the middle of each flow channel section, such as Figure 3 shown.

[0063] In some embodiments, the spoiler column 112 may also serve as a side wall structure of the sub-channel 111 , and thus be disposed in the channel section.

[0064] As an application example, the first liquid cooling plate 1 includes a plurality of sub-cold plates 14, which are sequentially spliced ​​to form the first liquid cooling plate 1. The sub-cold plates 14 can facilitate the production and processing of the first liquid cooling plate 1.

[0065] In some embodiments, the number of the sub-cold plates 14 can be set to correspond one-to-one with the number of the flow channel sections, so as to facilitate the processing and production of the internal structure of each flow channel section; and then the sub-cold plates 14 are welded to form an integrated first liquid cooling plate 1.

[0066] As one application example, along the flow direction of the cooling medium, the flow area of ​​the cooling medium in the first liquid cooling plate 1 gradually decreases. Different from the above example, in the above example, the main channel 11 is designed in sections, so as to reduce the flow area in each channel section. Figure 2 As shown; In this example, the main flow channel 11 is not designed in sections, but the internal structure is set to achieve a gradual decrease in the flow area in the main flow channel 11, such as Figure 5 , 6 as shown in .

[0067] In some embodiments, a plurality of heat dissipation ribs 15 are provided in the first liquid cooling plate 1, and the heat dissipation ribs 15 are extended along the length direction of the first liquid cooling plate 1, one end of the heat dissipation rib 15 is connected to the inner wall of the first liquid cooling plate 1, and the other end protrudes toward the inside of the first liquid cooling plate 1. The surface of the heat dissipation rib 15 is inclined, and the lower inclined end of the heat dissipation rib 15 is close to the input end of the cooling medium, and the higher inclined end of the heat dissipation rib 15 is close to the output end of the cooling medium. Figure 4-6 shown.

[0068] By providing the heat dissipation ribs 15 , the effect of gradually decreasing the flow area in the first liquid cooling plate 1 or the second liquid cooling plate 2 can also be achieved.

[0069] On the other hand, Figure 7 As shown, in this embodiment, a liquid cooling system is provided, in which the complementary cooling device as described above is arranged; it also includes a plurality of the first liquid cooling plates 1 and a plurality of the second liquid cooling plates 2; at this time, the first liquid cooling plates 1 and the second liquid cooling plates 2 are staggered with each other to form a plurality of the accommodating spaces 3.

[0070] In some embodiments, a liquid inlet pipe 6 and a liquid outlet pipe 7 are also provided. The liquid inlet pipe 6 is connected to the liquid inlet 51 of the first liquid cooling plate 1 and the second liquid cooling plate 2, and the liquid outlet pipe 7 is connected to the liquid outlet 52 of the first liquid cooling plate 1 and the second liquid cooling plate 2.

[0071] In some embodiments, the liquid inlet pipe 6 and the liquid outlet pipe 7 are arranged in a "U" shape and form an upper and lower layered layout, such as Figure 1 ,7 shown.

[0072] By forming a plurality of the accommodating spaces 3, it is possible to facilitate the installation and arrangement of more objects to be cooled, thereby achieving overall cooling.

[0073] On the other hand, Figure 8 As shown, in this embodiment, a battery pack is provided, including a plurality of battery cells 4 and a liquid cooling system as described above; wherein the width of the accommodating space 3 is adapted to the width or thickness of the battery cell 4 .

[0074] In some embodiments, Figure 8 As shown, the width of the accommodating space 3 is adapted to the thickness of the battery core 4, so that the first liquid cooling plate 1 and the second liquid cooling plate 2 can dissipate heat from the battery core 4 from two large sides of the battery core 4 respectively, and the overall heat dissipation effect is better.

[0075] In some embodiments, a thermal pad 16 is further disposed between the battery core 4 and the first liquid cooling plate 1 and the second liquid cooling plate 2 .

[0076] By designing the width of the accommodating space 3 , the complementary cooling device can perform heat exchange cooling on the side of the battery core 4 , thereby improving the cooling and heat exchange effect and improving the temperature consistency of the battery core 4 .

[0077] On the other hand, this embodiment also provides an electrical device, in which the battery pack as described above is arranged.

[0078] In some embodiments, the electrical device may be configured as an electric vehicle.

[0079] By applying the battery pack in electrical equipment, the temperature consistency of the battery cells 4 in the electrical equipment can be improved, so that the state of the battery cells 4 in the application can be more stable and reliable, which can extend the service life of the battery cells 4 and thus reduce the application cost of the electrical equipment.

[0080] The above description is only a specific implementation mode of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, the present application may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should also be included in the scope of protection of the present application. Therefore, the scope of protection of the present application shall be based on the scope of protection of the claims.

[0081] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A complementary cooling device, characterized in that: It includes a first liquid cooling plate and a second liquid cooling plate, wherein the first liquid cooling plate and the second liquid cooling plate are arranged parallel to each other and form a receiving space, and the receiving space is used for placing an object to be cooled; The flow direction of the cooling medium in the first liquid cooling plate is opposite to the flow direction of the cooling medium in the second liquid cooling plate; Along the flow direction of the cooling medium, the flow velocity of the cooling medium in the first liquid cooling plate and the second liquid cooling plate gradually increases.

2. The complementary cooling device according to claim 1, characterized in that A plurality of flow channel sections are arranged in the first liquid cooling plate and / or the second liquid cooling plate, and the plurality of flow channel sections are arranged in sequence along the flow direction of the cooling medium; Along the flow direction of the cooling medium, the flow area of ​​each flow channel section gradually decreases.

3. The complementary cooling device according to claim 2, characterized in that A plurality of sub-flow channels are arranged in the flow channel section, and along the flow direction of the cooling medium, the number of the sub-flow channels in each of the flow channel sections gradually increases.

4. The complementary cooling device according to claim 2, characterized in that Several flow-disturbing columns are arranged in the flow channel sections, and along the flow direction of the cooling medium, the density of the flow-disturbing columns in each of the flow channel sections gradually increases.

5. The complementary cooling device according to any one of claims 2 to 4, characterized in that: The first liquid cooling plate and / or the second liquid cooling plate includes a plurality of sub-cold plates, and the plurality of sub-cold plates are sequentially spliced ​​to form the first liquid cooling plate or the second liquid cooling plate.

6. The complementary cooling device according to claim 1, characterized in that Along the flow direction of the cooling medium, the flow area of ​​the cooling medium in the first liquid cooling plate and the second liquid cooling plate gradually decreases.

7. The complementary cooling device according to claim 6, characterized in that A plurality of heat dissipation ribs are arranged in the first liquid cooling plate and the second liquid cooling plate, and the heat dissipation ribs are extended along the length direction of the first liquid cooling plate and the second liquid cooling plate; The surface of the heat dissipation rib is arranged in an inclined manner, and the lower inclined end of the heat dissipation rib is close to the input end of the cooling medium, and the higher inclined end of the heat dissipation rib is close to the output end of the cooling medium.

8. A liquid cooling system, characterized in that: A complementary cooling device as described in any one of claims 1 to 7 is arranged therein; It comprises a plurality of the first liquid cooling plates and a plurality of the second liquid cooling plates, wherein the first liquid cooling plates and the second liquid cooling plates are arranged alternately to form a plurality of the accommodating spaces.

9. A battery pack, characterized in that: comprising a plurality of battery cells, and also comprising a liquid cooling system as described in claim 8; The width of the accommodating space is adapted to the width or thickness of the battery cell.

10. An electrical device, characterized in that: A battery pack as claimed in claim 9 is arranged therein.

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