Heat exchange structure and battery pack

Abstract

The application relates to the technical field of heat exchange, and discloses a heat exchange structure and a battery pack, the heat exchange structure comprising a heat exchange plate and a communicating piece, the heat exchange plate being provided with a first channel for flowing in of a heat exchange medium and a second channel for flowing out of the heat exchange medium; the communicating piece being provided with a communicating channel for communicating the first channel and the second channel, the communicating channel comprising a first region close to the first channel and a second region close to the second channel, the communicating piece being provided with a reinforced heat exchange structure at the first region for enhancing the convective heat exchange between the communicating piece and the heat exchange medium located at the first region, and / or the communicating piece being provided with a weakened heat exchange structure at the second region for weakening the convective heat exchange between the communicating piece and the heat exchange medium located at the second region. The application mainly solves the technical problem that the temperature difference between the liquid inlet channel and the liquid outlet channel of the existing heat exchange structure is relatively large.

Description

Technical Field

[0001] This invention relates to the field of heat exchange technology, and more particularly to a heat exchange structure and a battery pack. Background Technology

[0002] Existing heat exchange structures include two types: those for cooling objects and those for heating objects. These structures are typically designed with an inlet channel for the heat exchange medium to flow in and an outlet channel for the heat exchange medium to flow out. As the heat exchange medium flows within the structure, it exchanges heat with the structure, resulting in a significant temperature difference between the heat exchange medium in the inlet channel and the heat exchange medium in the outlet channel. For a detailed understanding, please refer to the following two paragraphs:

[0003] When the heat exchange structure is used in a cooling application, the heat exchange medium, which is the coolant, enters from the inlet channel and eventually flows out from the outlet channel. At this time, the temperature of the heat exchange medium, which is the coolant, will gradually increase in the flow direction due to the cooling effect, so that the temperature of the heat exchange medium in the inlet channel is lower than the temperature of the heat exchange medium in the outlet channel.

[0004] When the heat exchange structure is used in a heating application, the heat exchange medium, which serves as the heat source, enters from the inlet channel and eventually flows out from the outlet channel. At this time, the temperature of the heat exchange medium, which serves as the heat source, will gradually decrease in the direction of flow due to the heating effect, thereby making the temperature of the heat exchange medium in the inlet channel higher than that in the outlet channel.

[0005] In summary, the existing heat exchange structure has the technical problem of a large temperature difference between the liquid inlet channel and the liquid outlet channel. If the existing heat exchange structure is used to cool the positive and negative electrodes of the battery, there will be a large temperature difference between the positive and negative electrodes. The large temperature difference between the two electrodes is not conducive to the performance of the battery and will also have a certain impact on the battery's lifespan. Summary of the Invention

[0006] The purpose of this invention is to provide a heat exchange structure and a battery pack, mainly to solve the technical problem that the existing heat exchange structure has a large temperature difference between the liquid inlet channel and the liquid outlet channel.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A heat exchange structure, comprising:

[0009] The heat exchange plate has a first channel for the inflow of heat exchange medium and a second channel for the outflow of heat exchange medium.

[0010] A connecting member having a connecting channel connecting the first channel and the second channel, the connecting channel including a first region near the first channel and a second region near the second channel, the connecting member having an enhanced heat transfer structure in the first region for enhancing convective heat transfer between the connecting member and the heat transfer medium located in the first region, and / or, the connecting member having a weakened heat transfer structure in the second region for reducing convective heat transfer between the connecting member and the heat transfer medium located in the second region.

[0011] In one of the technical solutions, the connecting component includes a first pipe fitting, a second pipe fitting, and a connecting pipe connected in sequence;

[0012] The first pipe fitting has a first flow channel, the second pipe fitting has a second flow channel, and the connecting pipe has a connecting flow channel that connects the first flow channel and the second flow channel respectively. The first flow channel, the second flow channel and the connecting flow channel together constitute the connecting channel.

[0013] The first pipe fitting and the second pipe fitting are respectively connected to the heat exchange plate, the first flow channel is connected to the first channel, and the second flow channel is connected to the second channel.

[0014] In one of the technical solutions, the enhanced heat exchange structure is disposed in the first flow channel of the first pipe fitting, and the weakened heat exchange structure is disposed at the end of the connecting pipe away from the first pipe fitting.

[0015] In one of the technical solutions, the enhanced heat exchange structure includes at least one protrusion structure disposed on the inner wall of the first pipe fitting, wherein the protrusion structure forms a recessed structure on the side away from the inner wall of the first pipe fitting.

[0016] In one of the technical solutions, the inner wall of the first pipe fitting is provided with at least two rows of protruding structure groups arranged along the axial direction of the first pipe fitting. Each row of the protruding structure groups includes at least one protruding structure, and the protruding structures of adjacent protruding structure groups are staggered from each other along the axial direction of the first pipe fitting.

[0017] In one of the technical solutions, the shortest distance between two adjacent protrusions in each row of protrusion structure groups is greater than the maximum external dimension of the protrusion structure.

[0018] In one of the technical solutions, the protruding structure extends along the axial direction of the first pipe fitting, and a plurality of the protruding structures are arranged at circumferential intervals along the first pipe fitting.

[0019] In one of the technical solutions, the weakened heat exchange structure includes an arc structure, the inner wall diameter of which is equal to the inner diameter of the connecting pipe.

[0020] In one technical solution, the heat exchange plate is provided with a first limiting groove for limiting the position of the first pipe and a second limiting groove for limiting the position of the second pipe. A portion of the first pipe is inserted into the first limiting groove and abuts against the bottom of the first limiting groove, and a portion of the second pipe is inserted into the second limiting groove and abuts against the bottom of the second limiting groove. The bottom of the first limiting groove is provided with a first through hole for connecting the first flow channel and the first channel, and the bottom of the second limiting groove is provided with a second through hole for connecting the second flow channel and the second channel.

[0021] This application also provides a battery pack, including at least one battery cell and the heat exchange structure of any of the above technical solutions. The first electrode of the battery cell directly or indirectly abuts against the outer wall of the first channel provided on the heat exchange plate, and the second electrode of the battery cell directly or indirectly abuts against the outer wall of the second channel provided on the heat exchange plate. The first channel and the second channel are adjacent and parallel to each other, and the connecting member is provided at one end of the first channel and the second channel.

[0022] Compared with the prior art, the heat exchange structure provided by the present invention has at least the following beneficial effects:

[0023] The first channel of this solution is equivalent to the liquid inlet channel mentioned in the background art, and the second channel is equivalent to the liquid outlet channel mentioned in the background art. The connecting component of this solution is used to connect the first channel and the second channel. The connecting component of this solution has an enhanced heat transfer structure in the first region near the first channel. The enhanced heat transfer structure can enhance the convective heat transfer between the connecting component and the heat transfer medium in the first region. The connecting component of this solution also has a weakened heat transfer structure in the second region near the second channel. The weakened heat transfer structure can reduce the convective heat transfer between the connecting component and the heat transfer medium in the second region. For a detailed analysis, please refer to the following two paragraphs:

[0024] When the heat exchange structure is used to cool an object, the enhanced heat exchange structure increases the temperature of the heat exchange medium in the first region due to forced heat exchange. Since the first region and the first channel are arranged adjacent to each other, the temperature of the heat exchange medium in the first channel is appropriately increased. The weakened heat exchange structure decreases the temperature of the heat exchange medium in the second region due to weakened heat exchange. Since the second region and the second channel are arranged adjacent to each other, the temperature of the heat exchange medium in the second channel is appropriately decreased, thereby reducing the temperature difference between the heat exchange medium in the first channel and the second channel.

[0025] When the heat exchange structure is used to heat an object, the enhanced heat exchange structure reduces the temperature of the heat exchange medium in the first region due to forced heat exchange. Since the first region and the first channel are arranged adjacent to each other, the temperature of the heat exchange medium in the first channel is appropriately reduced. The weakened heat exchange structure increases the temperature of the heat exchange medium in the second region due to weakened heat exchange. Since the second region and the second channel are arranged adjacent to each other, the temperature of the heat exchange medium in the second channel is appropriately increased, thereby reducing the temperature difference between the heat exchange medium in the first channel and the second channel.

[0026] When the allowable temperature difference between the heat exchange medium in the first and second channels is large, either the enhanced heat exchange structure in the first region or the weakened heat exchange structure in the second region can be selected. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a heat exchange structure provided in an embodiment of this application;

[0029] Figure 2 for Figure 1 A schematic diagram of the heat exchange structure shown in the image from another angle;

[0030] Figure 3 for Figure 1 A top view of the heat exchange structure shown;

[0031] Figure 4 for Figure 3 Sectional view at point AA;

[0032] Figure 5 for Figure 4 A magnified view of the first region in the image;

[0033] Figure 6 for Figure 4 A magnified view of a section at point B in the middle;

[0034] Figure 7 for Figure 4 A magnified view of a section at point C;

[0035] Figure 8 for Figure 4 Another magnified view of point C in the middle;

[0036] Figure 9This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0037] Figure 10 This is a graph showing the temperature of the two electrodes of a battery cell changing over time when the heat exchange structure provided in this embodiment does not employ an enhanced heat exchange structure.

[0038] Figure 11 This is a graph showing the temperature of the two electrodes of a battery cell changing over time when the heat exchange structure provided in this embodiment adopts an enhanced heat exchange structure.

[0039] Figure 12 This is a graph showing the temperature of the two electrodes of a battery cell changing over time when the heat exchange structure provided in this embodiment simultaneously employs both enhanced and weakened heat exchange structures.

[0040] The following are the labeling elements in the figure:

[0041] 10. Heat exchange plate; 101. First channel; 102. Second channel; 103. First limiting groove; 104. Second limiting groove; 105. First through hole; 106. Second through hole; 107. Annular boss;

[0042] 20. Connecting component; 201. First pipe fitting; 2011. First flow channel; 2012. Recessed structure; 202. Second pipe fitting; 2021. Second flow channel; 203. Connecting pipe; 2031. Connecting flow channel; 204. Connecting passage; 205. First region; 206. Second region;

[0043] 30. Enhanced heat exchange structure; 301. Protruding structure; 40. Weakened heat exchange structure; 401. Arc structure; 50. Battery cell. Detailed Implementation

[0044] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0045] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0046] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0049] Please refer to the following: Figures 1 to 5 This embodiment provides a heat exchange structure for cooling or heating an object. The heat exchange structure includes a heat exchange plate 10 and a connecting member 20 connected together. The heat exchange plate 10 is provided with a first channel 101 and a second channel 102. The first channel 101 is used for the inflow of heat exchange medium, and the second channel 102 is used for the outflow of heat exchange medium. Both the first channel 101 and the second channel 102 are used to cool or heat the object. The connecting member 20 is provided with a connecting channel 204, which connects the first channel 101 and the second channel 102 respectively, so that the heat exchange medium entering from the first channel 101 can pass through the connecting channel 204 and be discharged outward along the second channel 102. The heat exchange medium can be a liquid or a gas. In this embodiment, the heat exchange medium is preferably a liquid.

[0050] The connecting member 20 is preferably made of aluminum. Because aluminum has excellent heat exchange performance, a significant temperature difference exists between the heat exchange medium in the first channel 101 and the heat exchange medium in the second channel 102 after passing through the connecting member 20. Specifically, when coolant is introduced into the first channel 101, the heat exchange medium, acting as the coolant, enters through the first channel 101, passes through the connecting channel 204, and finally flows out through the second channel 102. At this time, the temperature of the heat exchange medium, acting as the coolant, gradually increases with its flow direction, resulting in a lower temperature in the first channel 101 than in the second channel 102. Conversely, when a hotter heating medium is introduced into the first channel 101, the heat exchange medium, acting as the heat source, enters through the first channel 101, passes through the connecting channel 204, and finally flows out through the second channel 102. At this time, the temperature of the heat exchange medium, acting as the heat source, gradually decreases with its flow direction, resulting in a higher temperature in the first channel 101 than in the second channel 102.

[0051] To address the technical problem of a large temperature difference between the heat exchange medium in the first channel 101 and the heat exchange medium in the second channel 102, this embodiment provides a heat exchange enhancement structure 30 in the first region 205 of the connecting channel 204 near the first channel 101. Furthermore, this embodiment provides a heat exchange weakening structure 40 in the second region 206 of the connecting channel 204 near the second channel 102. The heat exchange enhancement structure 30 enhances the convective heat transfer between the connecting member 20 and the heat exchange medium in the first region 205, while the heat exchange weakening structure 40 reduces the convective heat transfer between the connecting member 20 and the heat exchange medium in the second region 206. For detailed analysis, please refer to the following two technical sections:

[0052] When the heat exchange structure is used to cool an object, a coolant with a lower temperature is introduced into the first channel 101. At this time, the temperature of the heat exchange medium in the first channel 101 is relatively low. The enhanced heat exchange structure 30 increases the temperature of the heat exchange medium in the first region 205 due to forced heat exchange. Since the first region 205 and the first channel 101 are arranged adjacent to each other, the temperature of the heat exchange medium in the first channel 101 is appropriately increased at this time. The temperature of the heat exchange medium in the second channel 102 is relatively high. The weakened heat exchange structure 40 decreases the temperature of the heat exchange medium in the second region 206 due to weakened heat exchange. Since the second region 206 and the second channel 102 are arranged adjacent to each other, the temperature of the heat exchange medium in the second channel 102 is appropriately decreased at this time, thereby significantly reducing the temperature difference of the heat exchange medium in the first channel 101 and the second channel 102.

[0053] When the heat exchange structure is used to heat an object, a hotter heat exchange medium is introduced into the first channel 101. At this time, the temperature of the heat exchange medium in the first channel 101 is relatively high. The enhanced heat exchange structure 30 reduces the temperature of the heat exchange medium in the first region 205 due to forced heat exchange. Since the first region 205 and the first channel 101 are arranged adjacently, the temperature of the heat exchange medium in the first channel 101 is appropriately reduced. The temperature of the heat exchange medium in the second channel 102 is relatively low. The weakened heat exchange structure 40 weakens its heat exchange efficiency due to weakened heat exchange, thereby relatively increasing the temperature of the heat exchange medium in the second region 206. Since the second region 206 and the second channel 102 are arranged adjacently, the temperature of the heat exchange medium in the second channel 102 is appropriately increased, thereby significantly reducing the temperature difference between the heat exchange medium in the first channel 101 and the second channel 102.

[0054] If the allowable temperature difference between the heat exchange medium in the first channel 101 and the second channel 102 is large, the enhanced heat exchange structure 30 in the first region 205 and the weakened heat exchange structure 40 in the second region 206 can be selected to reduce the complexity of the connecting parts 20, facilitate production, and also help reduce costs.

[0055] The connecting component 20 in this embodiment specifically includes a first pipe 201, a connecting pipe 203, and a second pipe 202 connected in sequence. The connecting component 20 is fabricated by splicing the three pipes in sequence, thereby reducing costs. Specifically, the first pipe 201 has a first flow channel 2011, the second pipe 202 has a second flow channel 2021, and the connecting pipe 203 has a connecting flow channel 2031. The first flow channel 2011, the connecting flow channel 2031, and the second flow channel 2021 together constitute the connecting channel 204. More specifically, the first pipe fitting 201 and the pipe containing the first channel 101 of the heat exchange plate 10 are welded together, and the first flow channel 2011 inside the first pipe fitting 201 is interconnected with the first channel 101 of the heat exchange plate 10. The second pipe fitting 202 is also welded together with the pipe containing the second channel 102 of the heat exchange plate 10, and the second flow channel 2021 inside the second pipe fitting 202 is interconnected with the second channel 102 of the heat exchange plate 10. The connecting flow channel 2031 is used to connect the first flow channel 2011 and the second flow channel 2021, so that the heat exchange medium flowing in from the first channel 101 can flow outward along the second channel 102 after passing through the first flow channel 2011, the connecting flow channel 2031 and the second flow channel 2021 in sequence. In order to reduce the planar area of ​​the heat exchange plate 10 in the heat exchange structure, the first pipe fitting 201 and the second pipe fitting 202 are set at an angle relative to the heat exchange plate 10. Preferably, the first pipe fitting 201 and the second pipe fitting 202 are both perpendicular to the heat exchange plate 10. In addition, in order to reduce the manufacturing difficulty of the connecting part 20 and avoid increasing the manufacturing cost by using a one-piece molded part, while the first pipe 201, the connecting pipe 203 and the second pipe 202 are spliced ​​together, the length of the connecting pipe 203 in this embodiment is designed to be greater than the distance between the first pipe 201 and the second pipe 202, that is, both ends of the connecting pipe 203 protrude outward relative to the first pipe 201 and the second pipe 202.

[0056] The aforementioned enhanced heat exchange structure 30 is arranged in the first flow channel 2011 of the first pipe fitting 201, and the aforementioned weakened heat exchange structure 40 is arranged at the end of the connecting pipe 203 away from the first pipe fitting 201.

[0057] Specifically, the enhanced heat exchange structure 30 includes at least one protruding structure 301 protruding from the inner wall of the first pipe fitting 201. To form the protruding structure 301, the outer wall of the first pipe fitting 201 is provided with a recessed structure 2012. By providing the recessed structure 2012, the inner wall of the first pipe fitting 201 can protrude and form the protruding structure 301. In other words, each protruding structure 301 has a corresponding recessed structure 2012 formed on the side away from the inner wall of the first pipe fitting 201. In this specific embodiment, the inner wall of the first pipe fitting 201 is provided with at least two rows of protruding structure groups, each row of protruding structure groups including at least one of the above-mentioned protruding structures 301. When there are multiple protruding structures 301 in a row of protruding structure groups, the multiple protruding structures 301 are arranged sequentially along the axial direction of the first pipe fitting 201. Moreover, the protruding structures 301 in two adjacent rows of protruding structure groups are staggered along the axial direction of the first pipe fitting 201, thereby improving the disturbance to the heat exchange medium and improving the heat exchange efficiency. Furthermore, the shortest distance between two adjacent protruding structures 301 within each row of protruding structures is greater than the maximum external dimension of the protruding structure 301, ensuring that the protruding structures 301 do not overlap and that the heat exchange medium can flow smoothly. In this embodiment, the protruding structure 301 is curved, which can be elongated, preferably hemispherical. That is, in this embodiment, the distance between two adjacent protruding structures 301 along the axial direction of the first pipe 201 is greater than the diameter of the protruding structure 301. Preferably, the interval between two adjacent protruding structures 301 is 5-20mm to facilitate fluid flow. More specifically, the radius r of the protruding structure 301 is smaller than the diameter D of the first pipe 201. Preferably, r = 1 / 2 * D ~ 3 / 4 * D, thereby ensuring fluid flow. The protruding structure 301 can enhance the disturbance of the heat exchange medium, thereby increasing the convective heat transfer coefficient between the heat exchange medium and the first pipe 201, and further improving the convective heat transfer effect of the heat exchange medium in the first region 205 within the connecting channel 204.

[0058] In other embodiments, the protrusion structure 301 may be an elongated protrusion extending axially along the first pipe 201. When there are multiple protrusion structures 301, the multiple elongated protrusion structures 301 may be arranged at intervals along the circumference of the first pipe 201. In more embodiments, the elongated protrusions may also be arranged at intervals along the axial direction of the first pipe 201, or may extend along the axial direction of the first pipe 201. The shape, size, and arrangement of the protrusion structures 301 may be configured as needed, as long as it can improve the disturbance to the heat exchange medium.

[0059] See Figure 4As shown, the weakened heat exchange structure 40 extends away from the first pipe fitting 201 and has an arc structure 401 at its end. The inner wall of the arc structure 401 is hemispherical, and its diameter is equal to the inner diameter of the connecting pipe 203, thereby maximizing the inner diameter of the arc structure. The outer wall of the arc structure 401 is also hemispherical for ease of manufacturing. The arc structure 401 can weaken the disturbance of the heat exchange medium, thereby weakening the convective heat transfer coefficient between the heat exchange medium and the connecting pipe 203, and thus weakening the convective heat transfer effect of the heat exchange medium in the connecting channel 204 at the second region 206. It should be noted that the distance between the arc structure 401 and the first pipe fitting 201 or the second pipe fitting 202 has minimal impact on heat exchange and can be set as needed. That is, the distance at which both ends of the connecting pipe 203 protrude outward relative to the first pipe fitting 201 and the second pipe fitting 202 is not limited, as long as it facilitates installation and production.

[0060] Please refer to the following: Figure 4 , Figure 6 and Figure 7In this embodiment, the heat exchange plate 10 is provided with a first limiting groove 103 and a second limiting groove 104. The end of the first pipe 201 is inserted into the first limiting groove 103 and abuts against the bottom of the first limiting groove 103. The first limiting groove 103 is used to limit the position of the first pipe 201 relative to the heat exchange plate 10, so as to ensure high airtightness between the first pipe 201 and the heat exchange plate 10 after welding them together. The bottom of the first limiting groove 103 is provided with a first through hole 105. The first through hole 105 is used to connect the first channel 101 of the heat exchange plate 10 and the first flow channel 2011 in the first pipe 201, so that the heat exchange medium located in the first channel 101 can enter the first flow channel 2011 after passing through the first through hole 105. The first flow channel 2011 of the first pipe fitting 201 is inserted into the second flow channel 2011; similarly, the end of the second pipe fitting 202 is inserted into the second limiting groove 104 and abuts against the bottom of the second limiting groove 104. The second limiting groove 104 is used to limit the position of the second pipe fitting 202 relative to the heat exchange plate 10, so as to ensure high airtightness between the second pipe fitting 202 and the heat exchange plate 10 after the second pipe fitting 202 and the heat exchange plate 10 are welded together. The bottom of the second limiting groove 104 is provided with a second through hole 106. The second through hole 106 is used to connect the second channel 102 of the heat exchange plate 10 and the second flow channel 2021 in the second pipe fitting 202, so that the heat exchange medium located in the second flow channel 2021 can enter the second channel 102 of the heat exchange plate 10 after passing through the second through hole 106. By providing a first limiting groove 103 and a second limiting groove 104, which respectively abut against the first pipe 201 and the second pipe 202, leakage of the heat exchange medium from the gap between the first pipe 201 and the heat exchange plate 10 or from the gap between the second pipe 202 and the heat exchange plate 10 can be reliably prevented. Furthermore, a first through hole 105 is provided at the center of the bottom of the first limiting groove 103, so that the bottom of the first limiting groove 103 has a supporting surface that abuts against the first pipe 201. The supporting surface is arranged around the edge of the first through hole 105. This supporting surface not only improves the airtightness of the first pipe 201 and the heat exchange plate 10, but also prevents the welding liquid from flowing into the first channel 101 during the welding process between the first pipe 201 and the wall of the first limiting groove 103. Similarly, the second through hole 106 is located at the center of the bottom of the second limiting groove 104, so that the bottom of the second limiting groove 104 has a bearing surface that abuts against the second pipe 202. The bearing surface is arranged around the edge of the second through hole 106. By setting the bearing surface, the airtightness of the second pipe 202 and the heat exchange plate 10 can also be improved, while preventing the welding liquid from flowing into the second channel 102 during the welding process between the second pipe 202 and the second limiting groove 104.

[0061] Both the first limiting groove 103 and the second limiting groove 104 can be used as follows: Figure 6 or Figure 7 As shown, it is formed by directly slotting into the heat exchange plate 10. The upper top surface of the heat exchange plate 10 can also be as shown... Figure 8 As shown, an annular boss 107 protrudes upwards. The inner diameter of the annular boss 107 is slightly larger than that of the first pipe fitting 201 / second pipe fitting 202 to facilitate the positioning and insertion of the first pipe fitting 201 / second pipe fitting 202, thereby increasing the contact area between the first pipe fitting 201 / second pipe fitting 202 and the heat exchange plate and improving airtightness. It should be noted that a first limiting groove 103 can also be provided on the pipe where the first channel 101 is located, and a second limiting groove 104 can be provided on the pipe where the second channel 102 is located. Furthermore, the first limiting groove 103 is opened on the pipe where the first channel 101 is located in a direction away from the heat exchange plate 10, and the second limiting groove 104 is opened on the pipe where the second channel 102 is located in a direction away from the heat exchange plate 10, in order to simplify the structure and reduce the flow channel layout.

[0062] In summary, the heat exchange structure of this embodiment achieves the purpose of balancing the temperature of the heat exchange medium in the first channel 101 and the second channel 102 by setting an enhanced heat exchange structure 30 in the first region 205 near the first channel 101 and a weakened heat exchange structure 40 in the second region 206 near the second channel 102, and ultimately reduces the temperature difference between the heat exchange medium in the first channel 101 and the heat exchange medium in the second channel 102.

[0063] Please refer to the following: Figures 10 to 12 , Figures 10 to 12 In the diagram, T1 represents the temperature change curve of the electrode of battery cell 50 facing the first channel 101, and T2 represents the temperature change curve of the electrode of battery cell 50 facing the second channel 102. When a -20°C coolant is introduced into the first channel 101, if the aforementioned enhanced heat transfer structure 30 and weakened heat transfer structure 40 are not used, as... Figure 10 As shown, with the increase of heat exchange time, the temperature difference between the two electrodes of multiple battery cells 50 will be around 4.8℃; if only the enhanced heat exchange structure 30 is used, such as Figure 11 As shown, when the same time of 1100s is reached, the temperature difference between the two electrodes of multiple battery cells 50 will be around 3.9℃; if both the enhanced heat transfer structure 30 and the weakened heat transfer structure 40 are used simultaneously, such as Figure 12As shown, at 1100s, the temperature difference between the two electrodes of multiple battery cells 50 can be controlled at around 2.4℃. It can be seen that the temperature difference between the positive and negative electrodes decreases from 4.8℃ without the addition of the enhanced heat exchange structure 30 and the weakened heat exchange structure 40 to 3.9℃ with only the enhanced heat exchange structure 30, achieving a temperature difference reduction effect of 18.75%. With both the enhanced and weakened heat exchange structures 30 and 40, the temperature difference decreases to 2.4℃, achieving a temperature difference reduction effect of 50%. It can be seen that compared to the enhanced heat exchange structure 30, the weakened heat exchange structure 40 has a greater temperature difference reduction effect and can significantly improve the temperature difference reduction efficiency. At the same time, reducing the temperature difference between the two electrodes of the battery cell 50 is beneficial to the performance of the battery cell 50 and can also extend the service life of the battery cell 50.

[0064] Please see Figure 9 This embodiment also provides a battery pack, which includes at least one battery cell 50 and the heat exchange structure described above. Preferably, there are multiple battery cells 50 in this embodiment. Each battery cell 50 has a first electrode and a second electrode. When the first electrode is positive, the second electrode is negative; when the first electrode is negative, the second electrode is positive. Specifically, the first electrodes of the multiple battery cells 50 are directly or indirectly abutted against the outer wall of the first channel 101 provided in the heat exchange plate 10, allowing the first channel 101 to exchange heat with the first electrode of the battery cell 50. The second electrodes of the multiple battery cells 50 are directly or indirectly abutted against the outer wall of the second channel 102 provided in the heat exchange plate 10, allowing the second channel 102 to exchange heat with the second electrode of the battery cell 50. The connecting member 20 is disposed at one end of the first channel 101 and the second channel 102 to avoid obstructing the multiple battery cells 50, reduce volume occupation, and improve overall energy density. In order to accommodate heat exchange for multiple battery cells 50 arranged side by side, this embodiment also designs the first channel 101 and the second channel 102 to be adjacent and arranged in parallel with each other.

[0065] The above are merely preferred embodiments of the present invention, and only specifically describe the technical principles of the present invention. These descriptions are only for explaining the principles of the present invention and should not be construed as limiting the scope of protection of the present invention in any way. Based on this explanation, any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention, as well as other specific embodiments of the present invention that can be conceived by those skilled in the art without creative effort, should be included within the scope of protection of the present invention.

Claims

1. A heat exchange structure, characterized in that, include: The heat exchange plate (10) has a first channel (101) for the inflow of heat exchange medium and a second channel (102) for the outflow of heat exchange medium. The connecting member (20) has a connecting channel (204) connecting the first channel (101) and the second channel (102), the connecting channel (204) including a first region (205) near the first channel (101) and a second region (206) near the second channel (102), the connecting member (20) is provided with an enhanced heat transfer structure (30) in the first region (205) for enhancing the convective heat transfer of the connecting member (20) and the heat transfer medium located in the first region (205), and / or, the connecting member (20) is provided with a weakened heat transfer structure (40) in the second region (206) for weakening the convective heat transfer of the connecting member (20) and the heat transfer medium located in the second region (206); The connecting component (20) includes a first pipe (201), a second pipe (202), and a connecting pipe (203) connected in sequence; the first pipe (201) and the second pipe (202) are arranged at an angle relative to the heat exchange plate (10).

2. The heat exchange structure as described in claim 1, characterized in that, The first pipe fitting (201) has a first flow channel (2011), the second pipe fitting (202) has a second flow channel (2021), and the connecting pipe (203) has a connecting flow channel (2031) that connects the first flow channel (2011) and the second flow channel (2021) respectively. The first flow channel (2011), the second flow channel (2021) and the connecting flow channel (2031) together constitute the connecting channel (204). The first pipe fitting (201) and the second pipe fitting (202) are respectively connected to the heat exchange plate (10), and the first flow channel (2011) is connected to the first channel (101), and the second flow channel (2021) is connected to the second channel (102).

3. The heat exchange structure as described in claim 2, characterized in that, The enhanced heat exchange structure (30) is disposed in the first flow channel (2011) of the first pipe fitting (201), and the weakened heat exchange structure (40) is disposed at the end of the connecting pipe (203) away from the first pipe fitting (201).

4. The heat exchange structure as described in claim 3, characterized in that, The enhanced heat exchange structure (30) includes at least one protrusion (301) disposed on the inner wall of the first pipe fitting (201), wherein the protrusion (301) forms a recess (2012) on the side away from the inner wall of the first pipe fitting (201).

5. The heat exchange structure as described in claim 4, characterized in that, The inner wall of the first pipe fitting (201) is provided with at least two rows of protruding structure groups arranged along the axial direction of the first pipe fitting (201). Each row of the protruding structure groups includes at least one protruding structure (301). The protruding structures (301) of adjacent protruding structure groups are staggered from each other along the axial direction of the first pipe fitting (201).

6. The heat exchange structure as described in claim 5, characterized in that, The shortest distance between two adjacent protrusions (301) in each row of protrusions is greater than the maximum external dimension of the protrusion (301).

7. The heat exchange structure as described in claim 4, characterized in that, The protruding structure (301) extends along the axial direction of the first pipe (201), and a plurality of the protruding structures (301) are arranged at circumferential intervals along the first pipe (201).

8. The heat exchange structure as described in claim 3, characterized in that, The weakened heat exchange structure (40) includes an arc structure (401), the inner diameter of which is equal to the inner diameter of the connecting pipe (203).

9. The heat exchange structure as described in claim 2, characterized in that, The heat exchange plate (10) is provided with a first limiting groove (103) for limiting the position of the first pipe (201) and a second limiting groove (104) for limiting the position of the second pipe (202). Part of the first pipe (201) is inserted into the first limiting groove (103) and abuts against the bottom of the first limiting groove (103). Part of the second pipe (202) is inserted into the second limiting groove (104) and abuts against the bottom of the second limiting groove (104). The bottom of the first limiting groove (103) is provided with a first through hole (105) for connecting the first flow channel (2011) and the first channel (101). The bottom of the second limiting groove (104) is provided with a second through hole (106) for connecting the second flow channel (2021) and the second channel (102).

10. A battery pack, characterized in that, The device includes at least one battery cell (50) and the heat exchange structure according to any one of claims 1 to 9. The first electrode of the battery cell (50) directly or indirectly abuts against the outer wall of the first channel (101) provided on the heat exchange plate (10), and the second electrode of the battery cell (50) directly or indirectly abuts against the outer wall of the second channel (102) provided on the heat exchange plate (10). The first channel (101) and the second channel (102) are adjacent and parallel to each other. The connecting member (20) is provided at one end of the first channel (101) and the second channel (102).

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