Heat exchangers and thermal management systems for new energy vehicles

Abstract

This application relates to a heat exchanger and a thermal management system for new energy vehicles. The heat exchanger has sequentially connected inlet heat collection channels, multiple layers of hot flow channels, and an outlet heat collection channel. The heat exchanger also has sequentially connected inlet cold flow channels, multiple layers of cold flow channels, and an outlet cold flow channel, with the hot and cold flow channel layers alternately stacked. The heat exchanger further includes a flow-dividing structure located at the connection between the inlet cold flow channels and the cold flow channel layers, and the inlet cold flow channels can connect to multiple adjacent cold flow channel layers through the flow-dividing structure. The heat exchanger and new energy vehicle thermal management system provided by this application solve the problem of the excessive difficulty in achieving uniform distribution of refrigerant within the inlet channel of the heat exchanger.

Description

Technical Field

[0001] This application relates to the field of heat exchange device technology, and in particular to a heat exchanger and a thermal management system for new energy vehicles. Background Technology

[0002] In battery thermal management systems, battery coolers are typically used to cool the coolant to ensure the battery operates within a reasonable temperature range. Battery coolers generally have a finned structure, with coolant on one side and refrigerant on the other. The refrigerant passes through an upstream expansion valve and becomes a two-phase gas-liquid mixture before entering the heat exchanger core.

[0003] Typically, heat exchangers contain multiple parallel refrigerant channels. When the refrigerant enters these channels in a gas-liquid two-phase state, its distribution within the inlet channel is primarily influenced by the refrigerant's own inertia, the frictional resistance of the channel's inner wall, and gravity. Furthermore, as the refrigerant enters each channel sequentially, the degree to which it is affected by these three factors changes. Therefore, the amount of refrigerant distributed through the inlet channel into different distribution channels is constantly changing. This makes improving the uniformity of refrigerant distribution within the inlet channel extremely difficult. Summary of the Invention

[0004] Therefore, it is necessary to provide a heat exchanger and a thermal management system for new energy vehicles to solve the problem of the difficulty in achieving uniform distribution of refrigerant in the inlet channel of the heat exchanger.

[0005] The heat exchanger provided in this application has a heat inlet collector channel, multiple layers of heat flow channels, and a heat outlet collector channel connected in sequence. The heat exchanger also has a cold inlet collector channel, multiple layers of cold flow channels, and a cold outlet collector channel connected in sequence, with the heat flow channels and cold flow channels alternately stacked. The heat exchanger also includes a flow-dividing structure located at the connection point between the cold inlet collector channel and the cold flow channel layers, and the cold inlet collector channel can be connected to multiple adjacent cold flow channel layers through the flow-dividing structure.

[0006] In one embodiment, each shunt structure corresponds to two adjacent cold flow channel layers.

[0007] In one embodiment, the two cold flow channel layers connected by the flow divider structure are defined as a first channel layer and a second channel layer, respectively. The heat exchanger includes a first partition plate, a second partition plate, a third partition plate, and a fourth partition plate stacked sequentially along the flow direction of the refrigerant in the cold inlet manifold channel. The first partition plate and the second partition plate enclose the first channel layer, and the third partition plate and the fourth partition plate enclose the second channel layer. The flow divider structure includes a first outer plate and a second outer plate. One end of the first outer plate is connected to the first partition plate, and the other end extends in a direction away from the starting end of the cold inlet manifold channel. One end of the second outer plate is connected to the fourth partition plate, and the other end extends in a direction close to the starting end of the cold inlet manifold channel. The first outer plate and the second outer plate are spaced apart along the axial direction of the cold inlet manifold channel and form an internal connection port, so that the cold inlet manifold channel connects to the first channel layer and the second channel layer respectively through the internal connection port.

[0008] In one embodiment, the diversion structure further includes a first inner plate and a second inner plate. One end of the first inner plate is connected to the end of the second partition plate near the cold inlet collection channel, and the other end extends toward the direction near the first partition plate and is spaced apart from the first partition plate. The first inner plate and the first outer plate form a first diversion channel. One end of the second inner plate is connected to the end of the third partition plate near the cold inlet collection channel, and the other end extends toward the direction near the fourth partition plate and is spaced apart from the fourth partition plate. The second inner plate and the second outer plate form a second diversion channel. The internal connecting port, the first diversion channel and the second diversion channel are interconnected to form a three-way channel.

[0009] In one embodiment, the diversion structure further includes a first extension plate, a second extension plate, a third extension plate, and a fourth extension plate. One end of the first extension plate is connected to the end of the first inner plate near the first partition plate, and the other end extends towards the first outer plate and is spaced apart from it. One end of the second extension plate is connected to the end of the first outer plate away from the first partition plate, and the other end extends towards the first inner plate and is spaced apart from it. The first and second extension plates divide the first diversion channel into a serpentine channel. One end of the third extension plate is connected to the end of the second inner plate near the fourth partition plate, and the other end extends towards the second outer plate and is spaced apart from it. One end of the fourth extension plate is connected to the end of the second outer plate away from the fourth partition plate, and the other end extends towards the second inner plate and is spaced apart from it. The third and fourth extension plates divide the second diversion channel into a serpentine channel.

[0010] In one embodiment, the first outer plate and the second outer plate are arranged radially apart along the cooling inlet manifold, and the distance between the first outer plate and the axis of the cooling inlet manifold is less than the distance between the second outer plate and the axis of the cooling inlet manifold.

[0011] In one embodiment, the distance between the first outer plate and the second outer plate decreases radially along the cold inlet manifold from the direction near the beginning of the cold inlet manifold to the direction away from the beginning of the cold inlet manifold.

[0012] In one embodiment, the first outer panel and the first partition plate are integrally formed, and the second outer panel and the fourth partition plate are integrally formed.

[0013] In one embodiment, the edge portion of the first partition plate near the cold inlet manifold extends toward the direction away from the starting end of the cold inlet manifold to form a first outer plate, and the edge portion of the fourth partition plate near the cold inlet manifold extends toward the direction near the starting end of the cold inlet manifold to form a second outer plate.

[0014] This application also provides a new energy vehicle thermal management system, which includes the heat exchanger described in any of the above embodiments.

[0015] Compared to existing technologies, the heat exchanger and new energy vehicle thermal management system provided in this application assume that the number of cold flow channel layers is N, and M cold flow channel layers correspond to one flow distribution structure, that is, the number of flow distribution structures is N / M (the result is an integer). Compared to when each cold flow channel layer has a refrigerant distribution port in the cold inlet manifold, the total number of refrigerant distribution ports in the cold inlet manifold is the same as the total number of cold flow channel layers (both are N). By setting N / M flow distribution structures, multiple cold flow channel layers only have one refrigerant distribution port in the cold inlet manifold, that is, the number of refrigerant distribution ports in the cold inlet manifold becomes N / M. This significantly reduces the number of refrigerant distribution ports in the cold inlet manifold, obviously reducing the difficulty of achieving uniform refrigerant distribution within the cold inlet manifold. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a heat exchanger according to an embodiment of this application;

[0018] Figure 2 A cross-sectional view of a heat exchanger according to an embodiment provided in this application;

[0019] Figure 3 for Figure 2 An enlarged view of point A shown;

[0020] Figure 4 A cross-sectional view of a heat exchanger according to another embodiment provided in this application;

[0021] Figure 5 for Figure 4 An enlarged view of point B shown;

[0022] Figure 6 A partial cross-sectional view of a heat exchanger according to another embodiment provided in this application.

[0023] Reference numerals: 110, Cold flow inlet manifold; 120, Cold flow channel layer; 121, First channel layer; 122, Second channel layer; 130, Cold flow outlet manifold; 200, Hot flow channel layer; 310, Refrigerant inlet pipe; 320, Refrigerant outlet pipe; 410, Coolant inlet pipe; 420, Coolant outlet pipe; 500, Heat exchange core; 600, Diversion structure; 610, First outer plate; 620, Second outer plate; 630, First inner plate; 640, Second inner plate; 650, First extension plate; 660, Second extension plate; 670, Third extension plate; 680, Fourth extension plate; 710, First partition plate; 720, Second partition plate; 730, Third partition plate; 740, Fourth partition plate; 800, Internal connection port; 910, First diversion channel; 920, Second diversion channel. Detailed Implementation

[0024] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not 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.

[0025] 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 at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] In battery thermal management systems, battery coolers are typically used to cool the coolant to ensure the battery operates within a reasonable temperature range. Battery coolers generally have a finned structure, with coolant on one side and refrigerant on the other. The refrigerant passes through an upstream expansion valve and becomes a two-phase gas-liquid mixture before entering the heat exchanger core.

[0031] Typically, heat exchangers contain multiple parallel refrigerant channels. When the refrigerant enters these channels in a gas-liquid two-phase state, its distribution within the inlet channel is primarily influenced by the refrigerant's own inertia, the frictional resistance of the channel's inner wall, and gravity. Furthermore, as the refrigerant enters each channel sequentially, the degree to which it is affected by these three factors changes. Therefore, the amount of refrigerant distributed through the inlet channel into different distribution channels is constantly changing. This makes improving the uniformity of refrigerant distribution within the inlet channel extremely difficult.

[0032] Please see Figures 1-6 To reduce the difficulty of achieving uniform distribution of refrigerant in the inlet channel of the heat exchanger, this application provides a heat exchanger and a thermal management system for new energy vehicles. The heat exchanger includes a refrigerant inlet pipe 310, a refrigerant outlet pipe 320, a coolant inlet pipe 410, a coolant outlet pipe 420, and a heat exchange core 500. The refrigerant enters the heat exchange core 500 from the refrigerant inlet pipe 310 and exits the heat exchange core 500 from the refrigerant outlet pipe 320. The coolant enters the heat exchange core 500 from the coolant inlet pipe 410 and exits the heat exchange core 500 from the coolant outlet pipe 420. Furthermore, the refrigerant and coolant exchange heat within the heat exchange core 500. The heat exchanger is provided with sequentially connected inlet heat flow channel (not shown), multi-layer heat flow channel layer 200, and outlet heat flow channel (not shown). The heat exchanger also has sequentially connected inlet cold flow channel 110, multi-layer cold flow channel layer 120, and outlet cold flow channel 130. The heat flow channel layer 200 and the cold flow channel layer 120 are alternately stacked. Furthermore, the refrigerant inlet pipe 310 connects to the inlet cold flow channel 110, the refrigerant outlet pipe 320 connects to the outlet cold flow channel 130, the coolant inlet pipe 410 connects to the inlet heat flow channel, and the coolant outlet pipe 420 connects to the outlet heat flow channel. Both the cold flow channel layer 120 and the heat flow channel layer 200 are located within the heat exchange core 500. Furthermore, the heat exchanger also includes a flow splitting structure 600, which is located at the connection between the cold inlet manifold 110 and the cold flow channel layer 120, and the cold inlet manifold 110 can be connected to multiple adjacent cold flow channel layers 120 through the flow splitting structure 600.

[0033] Assuming there are N cold flow channel layers 120, and M cold flow channel layers 120 correspond to one distribution structure 600, the number of distribution structures 600 is N / M (the result is an integer). Compared to when each cold flow channel layer 120 has a refrigerant distribution port in the cold inlet manifold 110, the total number of refrigerant distribution ports in the cold inlet manifold 110 is the same as the total number of cold flow channel layers 120 (both are N). By setting N / M distribution structures 600, multiple cold flow channel layers 120 only have one refrigerant distribution port in the cold inlet manifold 110, meaning the number of refrigerant distribution ports in the cold inlet manifold 110 becomes N / M. This significantly reduces the number of refrigerant distribution ports in the cold inlet manifold 110, obviously reducing the difficulty of achieving uniform refrigerant distribution within the cold inlet manifold 110.

[0034] Furthermore, in one embodiment, as Figures 2-6 As shown, each branch structure 600 corresponds to two adjacent cold flow channel layers 120.

[0035] This setup greatly reduces the difficulty of configuring the 600-level splitter structure.

[0036] However, it is not limited to this. Each branch structure 600 can also connect to three, four or more adjacent cold flow channel layers 120, which will not be listed here.

[0037] In one embodiment, such as Figures 2-6 As shown, the two cold flow channel layers 120 connected by the flow splitting structure 600 are defined as the first channel layer 121 and the second channel layer 122, respectively. The heat exchanger includes a first partition plate 710, a second partition plate 720, a third partition plate 730, and a fourth partition plate 740 stacked sequentially along the flow direction of the refrigerant in the cold inlet manifold 110. The first partition plate 710 and the second partition plate 720 form the first channel layer 121, and the third partition plate 730 and the fourth partition plate 740 form the second channel layer 122. The diversion structure 600 includes a first outer plate 610 and a second outer plate 620. One end of the first outer plate 610 is connected to the first partition plate 710, and the other end extends in a direction away from the starting end of the cold inlet manifold channel 110. One end of the second outer plate 620 is connected to the fourth partition plate 740, and the other end extends in a direction close to the starting end of the cold inlet manifold channel 110. The first outer plate 610 and the second outer plate 620 are spaced apart along the axial direction of the cold inlet manifold channel 110 and form an internal communication port 800, so that the cold inlet manifold channel 110 can be connected to the first channel layer 121 and the second channel layer 122 respectively through the internal communication port 800.

[0038] It should be noted that the starting end of the cooling inlet manifold 110 refers to the liquid inlet of the cooling inlet manifold 110.

[0039] This greatly reduces the processing difficulty of the 600 splitter structure.

[0040] Furthermore, in one embodiment, as Figures 2-6 As shown, the first outer plate 610 and the first partition plate 710 are integrally formed structures, and the second outer plate 620 and the fourth partition plate 740 are integrally formed structures.

[0041] However, this is not the only embodiment. In other embodiments, the first outer plate 610 and the first partition plate 710 may also be welded structures, and the second outer plate 620 and the fourth partition plate 740 may also be welded structures.

[0042] Furthermore, in one embodiment, as Figures 2-6 As shown, the first partition plate 710 extends from the edge of the cold inlet manifold 110 toward the direction away from the starting end of the cold inlet manifold 110 to form the first outer plate 610, and the fourth partition plate 740 extends from the edge of the cold inlet manifold 110 toward the direction near the starting end of the cold inlet manifold 110 to form the second outer plate 620.

[0043] This greatly improves the connection strength between the first outer plate 610 and the first partition plate 710, as well as the connection strength between the second outer plate 620 and the fourth partition plate 740.

[0044] Furthermore, in one embodiment, the first outer plate 610 and the second outer plate 620 are arranged radially apart along the cooling inlet manifold 110, and the distance between the first outer plate 610 and the axis of the cooling inlet manifold 110 is less than the distance between the second outer plate 620 and the axis of the cooling inlet manifold 110.

[0045] Thus, the first outer plate 610 is closer to the center of the cold inlet manifold 110 than the second outer plate 620. At this time, the opening direction of the internal connecting port 800 is away from the starting end of the cold inlet manifold 110. With this arrangement, the first outer plate 610 can play a certain role in blocking the refrigerant in the cold inlet manifold 110, preventing the refrigerant from entering the cold inlet manifold 110 and then concentrating into the internal connecting port 800 which is closer to the starting end of the cold inlet manifold 110. This allows for a certain degree of uniform distribution of the liquid inlet volume of the multiple internal connecting ports 800 in the cold inlet manifold 110.

[0046] Furthermore, in one embodiment, the radial spacing between the first outer plate 610 and the second outer plate 620 along the cold inlet manifold 110 tends to decrease along a direction from near the starting end of the cold inlet manifold 110 to away from the starting end of the cold inlet manifold 110.

[0047] This design prevents a large amount of refrigerant from entering the internal connection port 800, which is far from the starting end of the cold flow manifold 110. This further effectively balances the amount of refrigerant entering the cold flow channel layer 120, which is far from the starting end of the cold flow manifold 110, and the amount of refrigerant entering the cold flow channel layer 120, which is close to the starting end of the cold flow manifold 110, thereby achieving a more uniform distribution of refrigerant throughout the heat exchanger.

[0048] In one embodiment, such as Figures 4-6 As shown, the diversion structure 600 also includes a first inner plate 630 and a second inner plate 640. One end of the first inner plate 630 is connected to the end of the second partition plate 720 near the cold inlet manifold 110, and the other end extends towards the first partition plate 710 and is spaced apart from the first partition plate 710. The first inner plate 630 and the first outer plate 610 enclose a first diversion channel 910. One end of the second inner plate 640 is connected to the end of the third partition plate 730 near the cold inlet manifold 110, and the other end extends towards the fourth partition plate 740 and is spaced apart from the fourth partition plate 740. The second inner plate 640 and the second outer plate 620 enclose a second diversion channel 920. The internal connecting port 800, the first diversion channel 910 and the second diversion channel 920 are interconnected to form a three-way channel.

[0049] After the refrigerant enters the internal connection port 800, when the hydraulic pressure in the first distribution channel 910 and the second distribution channel 920 is not equal, the refrigerant can be redistributed between the first distribution channel 910 and the second distribution channel 920. Through the secondary distribution of the refrigerant, the uniformity of the refrigerant distribution in different cold flow channel layers 120 is further improved.

[0050] Furthermore, in one embodiment, as Figure 6As shown, the diversion structure 600 also includes a first extension plate 650, a second extension plate 660, a third extension plate 670, and a fourth extension plate 680. One end of the first extension plate 650 is connected to the end of the first inner plate 630 near the first partition plate 710, and the other end extends toward the direction near the first outer plate 610 and is spaced apart from the first outer plate 610. One end of the second extension plate 660 is connected to the end of the first outer plate 610 away from the first partition plate 710, and the other end extends toward the direction near the first inner plate 630 and is spaced apart from the first inner plate 630. The first extension plate 650 and the second extension plate 660 divide the first diversion channel 910 into a serpentine channel. The third extension plate 670 is connected at one end to the second inner plate 640 near the fourth partition plate 740, and the other end extends toward the second outer plate 620 and is spaced apart from the second outer plate 620. The fourth extension plate 680 is connected at one end to the second outer plate 620 away from the fourth partition plate 740, and the other end extends toward the second inner plate 640 and is spaced apart from the second inner plate 640. The third extension plate 670 and the fourth extension plate 680 divide the second diversion channel 920 into a serpentine channel.

[0051] Thus, the serpentine first and second branch channels 910 and 920 can impede the refrigerant to a certain extent, but will not significantly increase the pressure drop of the refrigerant. This arrangement can prevent the refrigerant from directly entering the first and second branch channels 910 and 920, which is conducive to the redistribution of the refrigerant between the first and second branch channels 910 and 920.

[0052] This application also provides a new energy vehicle thermal management system, which includes the heat exchanger described in any of the above embodiments.

[0053] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A heat exchanger, characterized in that, The heat exchanger is provided with a heat inlet collection channel, a multi-layer heat flow channel layer (200) and a heat outlet collection channel connected in sequence. The heat exchanger is also provided with a cold inlet collection channel (110), a multi-layer cold flow channel layer (120) and a cold outlet collection channel (130) connected in sequence. The heat flow channel layer (200) and the cold flow channel layer (120) are alternately stacked. The heat exchanger also includes a flow splitting structure (600), which is located at the connection between the cold inlet collection channel (110) and the cold flow channel layer (120), and the cold inlet collection channel (110) can be connected to a plurality of adjacent cold flow channel layers (120) through the flow splitting structure (600). Each of the aforementioned flow splitting structures (600) corresponds to two adjacent cold flow channel layers (120). The two cold flow channel layers (120) connected by the flow splitting structure (600) are defined as the first channel layer (121) and the second channel layer (122), respectively; the heat exchanger includes a first partition plate (710), a second partition plate (720), a third partition plate (730) and a fourth partition plate (740) stacked sequentially along the flow direction of the refrigerant in the cold inlet collection channel (110), the first partition plate (710) and the second partition plate (720) surround to form the first channel layer (121), and the third partition plate (730) and the fourth partition plate (740) surround to form the second channel layer (122); The diversion structure (600) includes a first outer plate (610) and a second outer plate (620). One end of the first outer plate (610) is connected to the first partition plate (710), and the other end extends in a direction away from the starting end of the cold inlet collection channel (110). One end of the second outer plate (620) is connected to the fourth partition plate (740), and the other end extends in a direction close to the starting end of the cold inlet collection channel (110). The first outer plate (610) and the second outer plate (620) are spaced apart along the axial direction of the cold inlet collection channel (110) and form an internal communication port (800) so that the cold inlet collection channel (110) can be connected to the first channel layer (121) and the second channel layer (122) respectively through the internal communication port (800).

2. The heat exchanger according to claim 1, characterized in that, The diversion structure (600) further includes a first inner plate (630) and a second inner plate (640). One end of the first inner plate (630) is connected to the end of the second partition plate (720) near the end of the cold inlet collection channel (110), and the other end extends toward the direction near the first partition plate (710) and is spaced apart from the first partition plate (710). The first inner plate (630) and the first outer plate (610) surround each other to form a first diversion channel (910). One end of the second inner plate (640) is connected to the end of the third partition plate (730) near the end of the cold inlet collection channel (110), and the other end extends toward the direction near the fourth partition plate (740) and is spaced apart from the fourth partition plate (740). The second inner plate (640) and the second outer plate (620) surround each other to form a second diversion channel (920). The internal connecting port (800), the first diversion channel (910) and the second diversion channel (920) are interconnected to form a three-way channel.

3. The heat exchanger according to claim 2, characterized in that, The diversion structure (600) further includes a first extension plate (650), a second extension plate (660), a third extension plate (670) and a fourth extension plate (680). One end of the first extension plate (650) is connected to the end of the first inner plate (630) near the first partition plate (710), and the other end extends toward the first outer plate (610) and is spaced apart from the first outer plate (610). One end of the second extension plate (660) is connected to the end of the first outer plate (610) away from the first partition plate (710), and the other end extends toward the first inner plate (630) and is spaced apart from the first inner plate (630). The first extension plate (650) and the second extension plate (660) divide the first diversion channel (910) into a serpentine channel. One end of the third extension plate (670) is connected to the end of the second inner plate (640) near the fourth partition plate (740), and the other end extends toward the direction near the second outer plate (620) and is spaced apart from the second outer plate (620). One end of the fourth extension plate (680) is connected to the end of the second outer plate (620) away from the fourth partition plate (740), and the other end extends toward the direction near the second inner plate (640) and is spaced apart from the second inner plate (640). The third extension plate (670) and the fourth extension plate (680) divide the second diversion channel (920) into a serpentine channel.

4. The heat exchanger according to claim 1, characterized in that, The first outer plate (610) and the second outer plate (620) are arranged radially apart along the cooling inlet manifold (110), and the distance between the first outer plate (610) and the axis of the cooling inlet manifold (110) is less than the distance between the second outer plate (620) and the axis of the cooling inlet manifold (110).

5. The heat exchanger according to claim 4, characterized in that, Along the direction from near the starting end of the cooling inlet manifold (110) to away from the starting end of the cooling inlet manifold (110), the radial spacing between the first outer plate (610) and the second outer plate (620) along the cooling inlet manifold (110) tends to decrease.

6. The heat exchanger according to claim 1, characterized in that, The first outer plate (610) and the first partition plate (710) are integrally formed structures, and the second outer plate (620) and the fourth partition plate (740) are integrally formed structures.

7. The heat exchanger according to claim 6, characterized in that, The first partition plate (710) extends from the edge of the cold inlet manifold (110) toward the direction away from the starting end of the cold inlet manifold (110) to form the first outer plate (610), and the fourth partition plate (740) extends from the edge of the cold inlet manifold (110) toward the direction near the starting end of the cold inlet manifold (110) to form the second outer plate (620).

8. A thermal management system for new energy vehicles, characterized in that, Includes the heat exchanger as described in any one of claims 1-7.

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