Heat exchange apparatus, battery pack, and electrical device

Abstract

Embodiments of the present application provide a heat exchange apparatus, a battery pack, and an electrical device, relating to the technical field of energy storage. The heat exchange apparatus comprises heat exchangers. The heat exchangers comprise a first heat exchanger and a second heat exchanger independent of each other. The first heat exchanger is at least disposed on one side of the second heat exchanger. The first heat exchanger is used for performing heat exchange with a first heat-generating region of a battery, and the second heat exchanger is used for performing heat exchange with a second heat-generating region of the battery. The heat generation amount of the first heat-generating region is greater than the heat generation amount of the second heat-generating region. A flow resistance structure is provided inside the first heat exchanger.

Description

Heat exchangers, battery packs and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202411181371.4, filed on August 26, 2024, entitled "Heat Exchanger, Battery Pack and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a heat exchange device, a battery pack, and an electrical appliance. Background Technology

[0003] A battery pack is a device that converts chemical energy into electrical energy and is widely used in new energy vehicles, energy storage power stations, and other fields. A battery pack typically consists of a housing and multiple battery cells housed within the housing. These battery cells generate a significant amount of heat during operation, usually requiring a heat exchange device within the housing to dissipate heat.

[0004] In related technologies, heat exchange devices typically include a flow channel plate, an inlet connector, and an outlet connector. The flow channel plate is configured to create a flow channel, and the inlet and outlet connectors are connected to the flow channel. Fluid enters the flow channel through the inlet connector, flows within the flow channel, and finally flows out through the outlet connector, completing the fluid circulation within the flow channel. However, current heat exchange devices cannot effectively control the flow rate of the fluid in the flow channel, thus failing to simultaneously achieve balanced heat exchange capacity and avoid resource waste. Summary of the Invention

[0005] In view of the above problems, embodiments of this application provide a heat exchange device, a battery pack, and electrical equipment, which can ensure the balance of heat exchange capacity of the heat exchange device and avoid waste of resources.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A first aspect of this application provides a heat exchange device, including a heat exchanger, wherein the heat exchanger includes a first heat exchanger and a second heat exchanger that are independent of each other, and the first heat exchanger is at least disposed on one side of the second heat exchanger.

[0008] The first heat exchanger is used to exchange heat with the first heating area of ​​the battery, and the second heat exchanger is used to exchange heat with the second heating area of ​​the battery. The heat generated by the first heating area is greater than the heat generated by the second heating area.

[0009] The first heat exchanger is equipped with a flow resistance structure.

[0010] In one possible implementation, the first heat exchanger includes a first sub-heat exchanger and a second sub-heat exchanger, with the first sub-heat exchanger and the second sub-heat exchanger respectively disposed on both sides of the second heat exchanger.

[0011] At least one of the first sub-heat exchanger and the second sub-heat exchanger is provided with a flow resistance structure.

[0012] In one possible implementation, the heat exchanger comprises a plurality of heat exchangers arranged sequentially along a first direction and connected in parallel with each other; each heat exchanger is used to exchange heat with each of the batteries.

[0013] Multiple first heat exchangers are connected in parallel, and multiple second heat exchangers are connected in parallel.

[0014] In one possible implementation, the heat exchange device includes a liquid inlet; in the first direction, the liquid inlet is disposed on one side of the heat exchanger;

[0015] The liquid inlet is connected to the liquid inlet of the first heat exchanger and the liquid inlet of the second heat exchanger, respectively.

[0016] In one possible implementation, the number of flow resistance structures in the plurality of first heat exchangers decreases along a first direction and away from the liquid inlet.

[0017] In one possible implementation, along a first direction and away from the liquid inlet, among the plurality of first heat exchangers, excluding the first heat exchanger furthest from the liquid inlet, in any two adjacent first heat exchangers, the number of flow resistance structures of the first heat exchanger closer to the liquid inlet is greater than or equal to the number of flow resistance structures of the first heat exchanger furthest from the liquid inlet.

[0018] In one possible implementation, among the plurality of first heat exchangers, the number of flow resistance structures in the first heat exchanger furthest from the liquid inlet is greater than the number of flow resistance structures in the second furthest from the liquid inlet.

[0019] In one possible implementation, the flow resistance structure is disposed in a second sub-heat exchanger in the first heat exchanger furthest from the liquid inlet.

[0020] In one possible implementation, the flow resistance structure includes a turbulence section through which the fluid velocity is less than that of the fluid velocity in the remaining sections of the heat exchange channel of the heat exchanger.

[0021] In one possible implementation, the number of turbulent flow sections in a plurality of first sub-heat exchangers decreases along the first direction and away from the liquid inlet.

[0022] In one possible implementation, in any two adjacent first sub-heat exchangers, the number of turbulent flow sections in the first sub-heat exchanger closer to the liquid inlet is greater than or equal to the number of turbulent flow sections in the first sub-heat exchanger farther from the liquid inlet.

[0023] In one possible implementation, along the first direction and away from the liquid inlet, the number of the turbulent flow sections in the plurality of second sub-heat exchangers first decreases and then increases.

[0024] In one possible implementation, in any two adjacent heat exchangers, the adjacent second sub-heat exchanger is symmetrically arranged with respect to the first sub-heat exchanger.

[0025] In one possible implementation, the second heat exchanger is provided with a flow resistance structure.

[0026] In one possible implementation, multiple second heat exchangers have the same structure.

[0027] In one possible implementation, the number of flow resistance structures in the plurality of second heat exchangers decreases along a first direction and away from the liquid inlet.

[0028] In one possible implementation, the flow resistance structure includes a turbulent flow section; in the second heat exchanger, the turbulent flow section is disposed in the middle of the heat exchange channel of the second heat exchanger.

[0029] In one possible implementation, the flow resistance structure includes a flow splitter node;

[0030] Along the first direction and away from the liquid inlet, the number of the flow splitting nodes in the plurality of the first heat exchangers shows an increasing trend.

[0031] In one possible implementation, along a first direction and away from the inlet, in any two adjacent first heat exchangers, the number of flow resistance structures in the first heat exchanger closer to the inlet is less than or equal to the number of flow resistance structures in the first heat exchanger away from the inlet.

[0032] In one possible implementation, the second heat exchanger is provided with a flow resistance structure;

[0033] Along the first direction and away from the liquid inlet, the number of flow resistance structures in the plurality of second heat exchangers is equal.

[0034] In one possible implementation, the heat exchanger's heat exchange channel includes multiple interconnected flow segments, with a flow branching node formed between two adjacent flow segments.

[0035] In one possible implementation, the heat exchange device further includes a first confluence channel and a second confluence channel; the first confluence channel is connected to the first heat exchanger, and the second confluence channel is connected to the second heat exchanger.

[0036] In one possible implementation, at least one of the first and second manifolds is connected to the heat exchanger via a bridging structure.

[0037] In one possible implementation, at least one of the first and second confluence channels is disposed in a different layer from the heat exchanger;

[0038] The confluence channels, which are located in different layers from the heat exchanger, are connected by a bridging structure.

[0039] In one possible implementation, along the stacking direction of the first confluence channel and the heat exchanger, the orthographic projection of the first confluence channel onto the plane containing the second confluence channel at least partially coincides with the second confluence channel.

[0040] In one possible implementation, the first confluence channel, the second confluence channel, and the heat exchanger are arranged in the same layer;

[0041] In the first and second manifolds in the first direction and on the same side of the heat exchanger, the first manifold is located on the side of the second manifold away from the heat exchanger;

[0042] The first flow channel is connected to the first heat exchanger via a bridging structure, and the second flow channel is connected to the second heat exchanger.

[0043] In one possible implementation, the heat exchange device further includes a liquid outlet, which is located on the same side of the heat exchanger as the liquid inlet; and the liquid outlet and the liquid inlet are spaced apart along a second direction; the second direction intersects the first direction.

[0044] In one possible implementation, the first manifold includes a first inlet manifold, a first outlet manifold, and a second outlet manifold.

[0045] Along the second direction, the first liquid inlet manifold and the first liquid outlet manifold are disposed on both sides of the heat exchanger, and the second liquid outlet manifold is located in the middle of the heat exchanger;

[0046] The liquid inlet end of each of the first heat exchangers is connected to the liquid inlet through the first liquid inlet manifold;

[0047] The liquid outlet of each of the first heat exchangers is connected to the liquid outlet in sequence through the first liquid outlet manifold and the second liquid outlet manifold.

[0048] In one possible implementation, the second manifold includes a second inlet manifold, a third outlet manifold, and a fourth outlet manifold.

[0049] Along the second direction, the second liquid inlet manifold and the third liquid outlet manifold are disposed on both sides of the heat exchanger, and the fourth liquid outlet manifold is located in the middle of the heat exchanger;

[0050] The liquid inlet end of each of the second heat exchangers is connected to the liquid inlet through the second liquid inlet manifold;

[0051] The liquid outlet of each of the second heat exchangers is connected to the liquid outlet in sequence through the third liquid outlet manifold and the fourth liquid outlet manifold.

[0052] In one possible implementation, the heat exchange device further includes a first connecting manifold and a second connecting manifold, the first connecting manifold and the second connecting manifold being located on the side of the heat exchanger opposite to the liquid inlet and extending along a second direction;

[0053] The first liquid outlet manifold is connected to the second liquid outlet manifold through the first connecting manifold;

[0054] The third liquid outlet manifold is connected to the fourth liquid outlet manifold through the second connecting manifold.

[0055] A second aspect of this application provides a battery pack, including the heat exchange device and battery pack described in the first aspect, wherein the heat exchange device exchanges heat with the battery pack.

[0056] A third aspect of this application provides an electrical device, including an electrical device and a battery pack as described in the second aspect, wherein the battery pack is electrically connected to the electrical device and is used to provide electrical energy to the electrical device.

[0057] The heat exchange device, battery pack, and electrical equipment provided in this application embodiment include a first heat exchanger and a second heat exchanger. The first heat exchanger is used to exchange heat with a first heating zone with higher heat generation, and the second heat exchanger is used to exchange heat with a second heating zone with lower heat generation. Thus, based on the premise that the battery has at least two heating zones with unequal heat generation, the heat exchanger is divided into at least two independent first and second heat exchangers. This allows for precise control of the temperature and heat generation of the first and second heat exchangers by adjusting their flow rates, ensuring uniform temperature distribution within the heat exchange device and thus ensuring temperature balance between the first and second heating zones of the battery. Furthermore, it is not necessary to design the fluid flow rate according to the heating zone with the highest heat exchange demand, avoiding resource waste and reducing the heat exchange cost of the heat exchange device.

[0058] This embodiment can also enhance the heat exchange capacity of the first heat exchanger by setting a flow resistance structure inside the first heat exchanger, thereby changing the flow velocity and flow rate of the fluid inside the first heat exchanger.

[0059] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the heat exchange device, battery pack, and electrical equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0060] To more clearly illustrate the technical solutions in the embodiments of this application 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 some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0061] Figure 1 is a schematic diagram of the battery pack provided in an embodiment of this application;

[0062] Figure 2 is a distribution diagram of the battery pack provided in an embodiment of this application;

[0063] Figure 3 is a schematic diagram of a heat exchanger provided in an embodiment of this application;

[0064] Figure 4 is a partial schematic diagram of the heat exchanger provided in an embodiment of this application;

[0065] Figure 5 is a partial schematic diagram of the heat exchanger provided in the embodiment of this application;

[0066] Figure 6 is a schematic diagram of the heat exchanger provided in an embodiment of this application;

[0067] Figure 7 is a partial schematic diagram of the heat exchanger provided in an embodiment of this application;

[0068] Figure 8 is a partial schematic diagram of the heat exchanger provided in an embodiment of this application;

[0069] Figure 9 is a schematic diagram of the heat exchanger provided in the embodiment of this application;

[0070] Figure 10 is a schematic diagram of the heat exchanger provided in an embodiment of this application;

[0071] Figure 11 is an enlarged schematic diagram of region A in Figure 10;

[0072] Figure 12 is a partial structural schematic diagram of the battery pack provided in an embodiment of this application;

[0073] Figure 13 is a partial structural schematic diagram of the battery pack provided in the embodiment of this application.

[0074] Explanation of reference numerals in the attached drawings: 100: Heat exchanger; 110: First heat exchanger; 111: First sub-heat exchanger; 112: Second sub-heat exchanger; 120: Second heat exchanger; 130: Flow channel plate; 140: Temperature distribution plate; 150: First manifold; 151: First liquid inlet manifold; 152: First liquid outlet manifold; 153: Second liquid outlet manifold; 160: Second manifold; 161: Second liquid inlet manifold; 162: Third liquid outlet manifold; 163: Fourth liquid outlet manifold; 181: First connecting manifold; 182: Second connecting manifold; 200: Battery; 210: First heating zone; 220: Second heating zone; 300: Liquid inlet; 310: First liquid inlet; 320: Second liquid inlet; 400: Flow resistance structure; 500: Liquid outlet; 510: First liquid outlet; 520: Second liquid outlet; 600: Bridging structure; 700: Support component; 710: First region; 720: Second region; 730: Connection point. Detailed Implementation

[0075] As described in the background section, heat exchange devices in related technologies cannot effectively control the flow rate of fluid in the flow channel, thus failing to simultaneously achieve cooling capacity and avoid resource waste. The inventors discovered that this problem arises because different parts of the battery cell in a battery pack often generate different amounts of heat. For example, along the width of the cell, the heat generated by the electrodes at both ends is greater than that in the middle section. Related heat exchange devices typically include a single inlet and outlet connector. The fluid flowing in from the inlet connector must pass through both ends and the middle of the cell. If the design is based on the refrigerant flow rate required to cool the ends of the cell, the refrigerant flow rate at the inlet connector needs to be increased. However, the middle section of the cell generates less heat and does not require a large refrigerant flow rate, resulting in resource waste. Conversely, if the design is based on the refrigerant flow rate required to cool both ends of the cell, it will cause overheating at the ends, reducing the stability and lifespan of the cell.

[0076] To address the aforementioned technical problems, this application provides a heat exchange device, a battery pack, and an electrical appliance. The heat exchanger includes a first heat exchanger and a second heat exchanger. The first heat exchanger exchanges heat with a first heating zone with higher heat generation, and the second heat exchanger exchanges heat with a second heating zone with lower heat generation. Thus, based on the premise that the battery has at least two heating zones with unequal heat generation, the heat exchanger is divided into at least two independent first and second heat exchangers. This allows for precise control of the temperature and heat output of the first and second heat exchangers by adjusting their flow rates, ensuring uniform temperature distribution within the heat exchange device and thus ensuring temperature balance between the first and second heating zones of the battery. Furthermore, it eliminates the need to design the fluid flow rate according to the heating zone with the highest heat exchange demand, avoiding resource waste and reducing the heat exchange cost of the device.

[0077] This embodiment can also adjust the heat exchange capacity of the first heat exchanger by setting a flow resistance structure inside the first heat exchanger, thereby changing the flow velocity and flow rate of the fluid inside the first heat exchanger.

[0078] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0079] Please refer to Figures 1 and 2. This embodiment of the application provides a heat exchange device for exchanging heat with a battery 200 in a battery pack. The battery 200 has at least two heating zones with unequal heat output. In two adjacent heating zones, the heat output of one heating zone may be greater than or less than that of the other heating zone. For example, the battery 200 includes a first heating zone 210 and a second heating zone 220, where the heat output of the first heating zone 210 is greater than that of the second heating zone 220. It should be noted that in this embodiment, the first heating zone 210 can be the area opposite to the battery terminals; this area has a higher heat output and is typically located at both ends of the battery in a second direction. The second heating zone 220 can be any area of ​​the battery other than the area opposite the terminals; this area has a lower heat output and is typically located in the middle region of the battery.

[0080] If the same heat exchanger is used to exchange heat between the first heating zone 210 and the second heating zone 220 of the battery 200, the temperatures of the first heating zone 210 and the second heating zone 220 will be uneven. Therefore, in this embodiment, the heat exchanger 100 is configured based on the layout of the first heating zone 210 and the second heating zone 220 of the battery 200.

[0081] For example, the heat exchanger 100 includes a first heat exchanger 110 and a second heat exchanger 120 that are independent of each other, with the first heat exchanger 110 at least disposed on one side of the second heat exchanger 120. The first heat exchanger 110 is used to exchange heat with the first heating zone 210 of the battery 200, and the second heat exchanger 120 is used to exchange heat with the second heating zone 220 of the battery 200. The heat generation of the first heating zone 210 is greater than the heat generation of the second heating zone 220. It should be noted that the number of first heat exchangers 110 matches the number of first heating zones 210, and the number of second heat exchangers 120 matches the number of second heating zones 220.

[0082] Referring to Figure 3, along a first direction, a first heat exchanger 110 is disposed on at least one side of a second heat exchanger 120. The first heat exchanger 110 can be disposed on one side of the second heat exchanger 120 or on both sides of the second heat exchanger 120. In one example, there is one first heat exchanger 110, located on one side of the second heat exchanger 120; for example, in the orientation shown in Figure 3, the first heat exchanger 110 is located on the left or right side of the second heat exchanger 120. In another example, there are two first heat exchangers 110, disposed on both sides of the second heat exchanger 120 along the first direction. The first direction can be the X direction in Figure 3.

[0083] Meanwhile, the first heating zone 210 of the battery 200 is also disposed at least on one side of the second heating zone 220. The number of first heating zones 210 corresponds to the number of first heat exchangers 110, and the number of second heating zones 220 corresponds to the number of second heat exchangers 120, so as to facilitate heat exchange between the first heat exchangers 110 and the first heating zone 210, and the second heat exchangers 120 for heat exchange with the second heating zone 220.

[0084] In this embodiment, based on the fact that the battery 200 has at least two first heating zones and a second heating zone with different heat outputs, the heat exchanger 100 is divided into at least two independent first heat exchangers 110 and second heat exchangers 120. In this way, by adjusting the flow rate of the first heat exchangers 110 and the second heat exchangers 120, the temperature and heat output of the first heat exchangers 110 and the second heat exchangers 120 can be precisely controlled, ensuring that the temperature distribution of the heat exchange device is uniform, and thus ensuring the temperature balance of the first heating zone 210 and the second heating zone 220 of the battery 200.

[0085] For example, for the first heating zone 210 with a large amount of heat generation, a more efficient first heat exchanger 110 can be designed, while for the second heating zone 220 with a smaller amount of heat generation, a relatively simple second heat exchanger 120 can be designed. It is not necessary to design the fluid flow rate according to the heating zone with the greatest heat exchange demand of the battery. This can not only reduce or even avoid resource waste and reduce the heat exchange cost of the heat exchange device, but also optimize the performance of the heat exchanger 100 and ensure the temperature uniformity of each heating zone of the battery 200.

[0086] In this embodiment, a flow resistance structure 400 is provided inside the first heat exchanger 110. The flow resistance structure 400 changes the flow velocity and flow rate of the fluid inside the first heat exchanger 110, thereby better enhancing the heat exchange capacity of the first heat exchanger 110.

[0087] It should be noted that the number of first heat exchangers 110 in this embodiment can be one or two. For example, referring to Figure 4, the number of first heat exchangers 110 provided in this embodiment is two. For instance, the two first heat exchangers 110 include a first sub-heat exchanger 111 and a second sub-heat exchanger 112, which are respectively disposed on both sides of the second heat exchanger 120; at least one of the first sub-heat exchanger 111 and the second sub-heat exchanger 112 is provided with a flow resistance structure 400.

[0088] In other words, one of the first sub-heat exchanger 111 and the second sub-heat exchanger 112 is provided with a flow resistance structure 400, or both the first sub-heat exchanger 111 and the second sub-heat exchanger 112 are provided with a flow resistance structure 400. This arrangement allows for the reasonable adjustment of the position of the flow resistance structure 400 according to the heating conditions of each heating zone of the battery 200, thereby better controlling and adjusting the fluid flow velocity and direction, reducing fluid turbulence and resistance, and thus improving the heat exchange efficiency and stability of the heat exchange device.

[0089] In one possible implementation, the heat exchanger 100 comprises multiple heat exchangers 100, i.e., the number of heat exchangers 100 is multiple. The multiple heat exchangers 100 are arranged sequentially along a first direction and connected in parallel with each other, and each heat exchanger 100 is used to exchange heat with each battery 200. In this way, the heat exchange device can exchange heat with multiple batteries 200, thereby improving the heat exchange efficiency of the heat exchange device.

[0090] Furthermore, each heat exchanger 100 in the heat exchange device is independent of the others and connected in parallel. On the one hand, if one heat exchanger 100 fails, it will not affect the use of the remaining heat exchangers 100, thereby preventing thermal failure of the remaining batteries 200 and improving the safety of the battery pack. On the other hand, if one heat exchanger 100 fails, it will not affect the normal operation of the other heat exchangers 100, making the maintenance and repair of the heat exchange device more convenient and reducing downtime and maintenance costs.

[0091] Given that the heat exchanger 100 in this embodiment includes a first heat exchanger 110 and a second heat exchanger 120, the multiple first heat exchangers 110 and the multiple second heat exchangers 120 in this embodiment are connected in parallel. In this way, the multiple first heat exchangers 110 and the multiple second heat exchangers 120 can be controlled individually, so that the heat exchange capabilities of the multiple first heat exchangers 110 and the multiple second heat exchangers 120 are different. This allows for targeted heat exchange in the first and second heating areas of the battery 200, improving the uniformity of the heat exchange capability of the heat exchange device and thus improving the temperature uniformity of various areas of the battery 200.

[0092] It should be noted that the definition of the first direction in this embodiment can have multiple options. For example, the first direction can be parallel to the horizontal direction or it can have a certain angle with the horizontal direction. Taking the orientation shown in Figure 1 as an example, in one example, the first direction can be parallel to the X direction. In another example, the first direction can be parallel to the Y direction. In yet another example, the first direction can have a certain angle with both the X and Y directions.

[0093] The following embodiments are described in detail using the X direction in Figure 3 as the first direction.

[0094] In one possible implementation, the heat exchange device includes a liquid inlet 300, which is located on one side of the heat exchanger 100 in a first direction.

[0095] The liquid inlet 300 is connected to the liquid inlet end of the first heat exchanger 110 and the liquid inlet end of the second heat exchanger 120, respectively. It should be noted that in this embodiment, the first heat exchanger 110 and the second heat exchanger 120 are relatively independent and are used to exchange heat in different heat-generating areas of the battery 200. The first heat exchanger 110 and the second heat exchanger 120 need to have different heat exchange capabilities. Therefore, in this embodiment, the liquid inlet 300 may include two different outlets, or the number of liquid inlets 300 may be two. For example, the liquid inlet 300 disclosed in this embodiment may include a first liquid inlet 310 and a second liquid inlet 320, and the first liquid inlet 310 and the second liquid inlet 320 are relatively independent. The first liquid inlet 310 can be connected to the liquid inlet end of the first heat exchanger 110, and the second liquid inlet 320 can be connected to the liquid inlet end of the second heat exchanger 120. In this way, it is convenient to control the flow rate and temperature of the fluid in the first heat exchanger 110 and the second heat exchanger 120 separately, thereby ensuring the balance of the heat exchange capacity of the heat exchange device.

[0096] In this embodiment, the first liquid inlet 310 and the second liquid inlet 320 can be located on the same side of the heat exchanger 100 in the first direction, which can optimize the layout of the heat exchanger 100, the first liquid inlet 310 and the second liquid inlet 320, making the layout of the heat exchanger more compact.

[0097] When the heat exchanger 100 includes multiple heat exchangers, each first heat exchanger 110 is provided with a flow resistance structure 400. The reason for this arrangement is that the distance between the liquid inlet end and the liquid inlet 300 of the first heat exchanger 110 is not equal. Correspondingly, the fluid travels along the path of each first heat exchanger 110. Therefore, in this embodiment, a flow resistance structure 400 is provided in each first heat exchanger 110. The flow resistance structure 400 can effectively balance the distribution of fluid in each first heat exchanger 110. Even if the distance between the liquid inlet end and the liquid inlet 300 of each first heat exchanger 110 is different, the flow resistance structure 400 can adjust the fluid flow rate to ensure that the fluid flow rate in each first heat exchanger 110 is approximately the same. This can prevent local overheating or undercooling of some first heat exchangers 110 due to excessively fast or slow fluid flow rates, which helps to maintain the overall temperature uniformity of the heat exchange device and improves the reliability and stability of the heat exchange device.

[0098] It should be understood that the number of flow resistance structures 400 in each first heat exchanger 110 can be freely set according to the distance between each first heat exchanger 110 and the liquid inlet 300, as well as the heat exchange requirements of each first heat exchanger 110.

[0099] For example, along the first direction and away from the liquid inlet 300, the number of flow resistance structures 400 in the plurality of first heat exchangers 110 shows a decreasing trend. It should be noted that, in this embodiment, the decreasing trend can be understood as the number of flow resistance structures 400 in the first heat exchangers 110 closer to the liquid inlet 300 being more, while the number of flow resistance structures 400 in the first heat exchangers 110 farther from the liquid inlet 300 being less. The decreasing trend can be a gradual decrease, showing a linear change; or it can be a gradual decrease overall, but the number of flow resistance structures 400 in some adjacent first heat exchangers 110 can be equal.

[0100] Given that the first heat exchanger 110 on the side closer to the liquid inlet 300 is more likely to receive a larger fluid flow rate and has a smaller pressure drop loss, while the first heat exchanger 110 on the side farther from the liquid inlet 300 has a large pressure drop loss, there is no need to set too many flow resistance structures 400.

[0101] Therefore, in this embodiment, along the first direction and away from the inlet 300, the number of flow resistance structures 400 in the multiple first heat exchangers 110 tends to decrease. By increasing the number of flow resistance structures 400 in the first heat exchangers 110 near the inlet 300, the fluid velocity in the first heat exchangers 110 near the inlet 300 can be effectively reduced, thereby balancing the fluid flow rate in each first heat exchanger 110 and ensuring that the fluid flow rate in each first heat exchanger 110 is approximately the same. Furthermore, by rationally distributing the number of flow resistance structures 400 in each first heat exchanger 110, the pressure drop and energy consumption of the fluid flowing through the heat exchange device can be minimized while ensuring a balanced flow rate. This not only helps save energy but also reduces the operating cost of the heat exchange device.

[0102] It should be noted that the first heat exchanger 110 typically includes a heat exchange channel. In this embodiment, the flow resistance structure 400 can be disposed within the heat exchange channel of the first heat exchanger 110. It can be a turbulence protrusion or a perforated turbulence plate disposed within the heat exchange channel; or, the inner wall of the heat exchange channel can be corrugated. In addition, the flow resistance structure 400 can also be disposed at a flow branching node on the heat exchange channel.

[0103] In one possible implementation, the direction along the first direction and away from the inlet 300, taking the orientation shown in Figure 3 as an example, can be understood as the direction from left to right.

[0104] In a plurality of first heat exchangers 110, excluding the first heat exchanger 110 furthest from the liquid inlet 300, in any two adjacent first heat exchangers 110, the number of flow resistance structures 400 of the first heat exchanger 110 closer to the liquid inlet 300 is greater than or equal to the number of flow resistance structures 400 of the first heat exchanger 110 furthest from the liquid inlet 300. In one example, the number of flow resistance structures 400 of the first heat exchanger 110 closer to the liquid inlet 300 is greater than the number of flow resistance structures 400 of the first heat exchanger 110 furthest from the liquid inlet 300, such that the number of flow resistance structures 400 gradually decreases along a first direction. In another example, the number of flow resistance structures 400 of the first heat exchanger 110 closer to the liquid inlet 300 is equal to the number of flow resistance structures 400 of the first heat exchanger 110 furthest from the liquid inlet 300.

[0105] Since the pressure drop is smallest in the first heat exchanger 110 closest to the inlet 300, the pressure drop and flow velocity increase accordingly with the greater distance from the inlet 300. Therefore, along the first direction away from the inlet 300, the number of flow resistance structures 400 in the multiple first heat exchangers 110, except for the one furthest from the inlet 300, tends to decrease. This balances the flow rate in each first heat exchanger 110, making the flow rate of each first heat exchanger 110 basically the same. This prevents local overheating or undercooling caused by excessively fast or slow fluid flow in some first heat exchangers 110, helps maintain the overall temperature uniformity of the heat exchange device, and improves the reliability and stability of the heat exchange device.

[0106] It should be noted that the farthest first heat exchanger 110 can be understood as the first heat exchanger 110 that is the furthest from the liquid inlet 300. For example, if there are 5 first heat exchangers 110, taking the orientation shown in Figure 3 as an example, in the first direction, the 5th first heat exchanger 110 from left to right is called the farthest first heat exchanger 110.

[0107] The number of flow resistance structures 400 in the plurality of first heat exchangers 110 can also be other options. In one possible implementation, the number of flow resistance structures 400 in the first heat exchanger 110 furthest from the liquid inlet 300 is greater than the number of flow resistance structures 400 in the second furthest from the liquid inlet 300.

[0108] To simplify the layout of the heat exchange channels within the heat exchanger 100, the inlet and / or outlet ends of two adjacent second sub-heat exchangers 112 and first sub-heat exchangers 111 in two adjacent heat exchangers 100 are connected together and communicate with the manifold. As can be clearly seen from Figure 4, along the first direction and away from the inlet 300, the second sub-heat exchanger 112 of the first heat exchanger 100 and the first sub-heat exchanger 111 of the second heat exchanger 100 are connected together. The second sub-heat exchanger 112 of the second heat exchanger 100 is connected to the first sub-heat exchanger 111 of the third heat exchanger 100, and so on. The second sub-heat exchanger 112 of the third heat exchanger 100 and the first sub-heat exchanger 111 of the fourth heat exchanger 100 are connected together. As a result, the sum of the heat exchange flow paths of the second sub-heat exchanger 112 of the third heat exchanger 100 and the first sub-heat exchanger 111 of the fourth heat exchanger 100 will be greater than the heat exchange flow path of the second sub-heat exchanger 112 of the fourth heat exchanger 100. This leads to an excessive pressure drop and excessive flow velocity in the first heat exchanger 110, which is furthest from the inlet 300.

[0109] Based on the above theory, in this embodiment, the number of flow resistance structures 400 in the first heat exchanger 110 furthest from the liquid inlet 300 is greater than the number of flow resistance structures 400 in the second furthest heat exchanger 110 furthest from the liquid inlet 300. This results in an increasing number of turbulent flow sections in the first heat exchanger 110 furthest from the liquid inlet 300, thereby reducing the pressure drop and flow velocity in the first heat exchanger 110 furthest from the liquid inlet 300, maximizing the balance of flow rate in each first heat exchanger 110, making the flow rate of each first heat exchanger 110 basically the same, and improving the heat exchange balance of the heat exchange device.

[0110] It should be noted that, taking the structure of heat exchanger 100 shown in Figure 3 as an example, the first heat exchanger 110 furthest from the liquid inlet 300 can be understood as the fourth first heat exchanger 110, and the first heat exchanger 110 furthest from the liquid inlet 300 can be understood as the third first heat exchanger 110.

[0111] Based on the above theory, the flow resistance structure 400 in the first heat exchanger 110 furthest from the liquid inlet 300 can be located in either the first sub-heat exchanger 111 or the second sub-heat exchanger 112. For example, in the first heat exchanger 110 furthest from the liquid inlet 300, the flow resistance structure 400 is located in the second sub-heat exchanger 112. This arrangement avoids excessively rapid pressure drop in the second sub-heat exchanger 112 of the first heat exchanger 110 furthest from the liquid inlet 300, effectively controls the fluid flow path, reduces unnecessary fluid resistance, and ensures that the fluid can smoothly pass through the entire heat exchange device, thus improving the uniformity of the heat exchange capacity of the heat exchange device.

[0112] As one possible implementation of the flow resistance structure 400, the flow resistance structure 400 includes a turbulent flow section, through which the fluid velocity is lower than that of the fluid in the other flow sections of the heat exchanger. That is, the heat exchange channel of the heat exchanger 100 includes a turbulent flow section and a non-turbulent flow section. In this embodiment, the turbulent flow section can be understood as a straight-flow channel in the heat exchange channel that does not extend along the second direction. For example, the shape of the turbulent flow section can be wavy or sawtooth. The non-turbulent flow section can be understood as a straight-flow channel in the heat exchange channel that extends along the second direction.

[0113] By making the fluid velocity in the turbulent flow section less than the fluid velocity in the other sections of the heat exchange channel of the heat exchanger 100, the flow resistance of the heat exchange channel with the turbulent flow section can be increased, thereby balancing the flow rate in each heat exchanger 100 and making the flow rate of each heat exchanger 100 basically the same.

[0114] Furthermore, the heat exchange device in this embodiment adopts a gas-liquid phase change heat exchange method. The wave-shaped flow resistance structure 400 can enhance the turbulence of the fluid, enhance the mixing of the gas and liquid phases, and thus increase the heat exchange contact area of ​​the liquid phase. This enhances the heat exchange capacity at the location of the flow resistance structure 400 and also improves the heat exchange effect of the heat exchange device.

[0115] Please continue to refer to Figures 3 and 4. Along the first direction and away from the liquid inlet 300, the number of turbulent flow sections in the plurality of first sub-heat exchangers 111 shows a decreasing trend. The explanation of the decreasing trend can be found in the above-described embodiments, which will not be elaborated further here.

[0116] In one example, in any two adjacent first sub-heat exchangers 111, the number of turbulent flow sections in the first sub-heat exchanger 111 closer to the liquid inlet 300 is greater than or equal to the number of turbulent flow sections in the first sub-heat exchanger 111 farther from the liquid inlet 300. For example, the number of turbulent flow sections in multiple first sub-heat exchangers 111 gradually decreases. For example, the heat exchange channels of the first sub-heat exchanger 111 closest to the liquid inlet 300 are all wavy; most of the heat exchange channels of the first sub-heat exchanger 111 next closest to the liquid inlet 300 are wavy; a small portion of the flow sections in the next closest first sub-heat exchanger 111 are wavy; and no turbulent flow sections are provided in the first sub-heat exchanger 111 farther from the liquid inlet 300. This arrangement can balance the flow rate in each first sub-heat exchanger 111, making the flow rate of each first sub-heat exchanger 111 basically the same, and improving the heat exchange uniformity of the heat exchange device.

[0117] In one possible implementation, referring to Figure 3, along the first direction and away from the inlet 300, the number of turbulent flow sections in the plurality of second sub-heat exchangers 112 first decreases and then increases. That is, the number of turbulent flow sections in the second sub-heat exchanger 112 furthest from the inlet 300 is greater than the number of turbulent flow sections in the second sub-heat exchanger 112 furthest from the inlet 300. This reduces the pressure drop and flow velocity in the second sub-heat exchanger 112 furthest from the inlet 300, maximizing the balance of flow rates in each second sub-heat exchanger 112, making the flow rates of each second sub-heat exchanger 112 essentially the same, and improving the heat exchange uniformity of the heat exchange device.

[0118] Please continue to refer to Figure 3. In any two adjacent heat exchangers 100, the adjacent second sub-heat exchanger 112 is symmetrically arranged with the first sub-heat exchanger 111. For example, the second sub-heat exchanger 112 in the first heat exchanger 100 is symmetrically arranged with the first sub-heat exchanger 111 in the second heat exchanger 100.

[0119] The adjacent second sub-heat exchanger 112 and the first sub-heat exchanger 111 can be connected to the same flow channel through a connecting channel. The adjacent second sub-heat exchanger 112 and the first sub-heat exchanger 111 are symmetrically arranged. On the one hand, this can make the fluid distribution of the adjacent second sub-heat exchanger 112 and the first sub-heat exchanger 111 more uniform and improve the heat exchange uniformity of each heat exchanger 100. On the other hand, it can simplify the manufacturing process of the heat exchanger 100 and reduce the manufacturing difficulty of the heat exchanger 100.

[0120] In one possible implementation, referring to Figures 3, 5, and 8, a flow resistance structure 400 is provided in the second heat exchanger 120. Thus, the flow resistance structure 400 allows for better control and adjustment of the fluid flow velocity and direction in the second heat exchanger 120, reducing fluid turbulence and resistance, thereby improving the heat exchange efficiency and stability of the heat exchange device.

[0121] The arrangement of the flow resistance structure 400 in the second heat exchanger 120 can be varied. In one example, multiple second heat exchangers 120 have identical structures, meaning that the same flow resistance structure 400 is provided in each of the multiple second heat exchangers 120. The flow path of each second heat exchanger 120 is equal, ensuring that the fluid flows along a consistent path length in all the second heat exchangers 120, thus achieving a uniform heat exchange effect, helping to improve the heat exchange efficiency of the heat exchange device and reduce local overheating or undercooling. Furthermore, it greatly simplifies the design and manufacturing process of the heat exchanger 100, thereby improving the production efficiency of the heat exchanger 100. In another example, along the first direction and away from the liquid inlet, the number of flow resistance structures 400 in the multiple second heat exchangers 120 decreases. This effectively optimizes the fluid flow. As can be clearly seen from Figure 3, the multiple second heat exchangers 120 are all connected in parallel and communicate with the confluence channel.

[0122] Thus, in the second heat exchanger 120 near the inlet 300, the flow velocity is relatively high because the fluid has just entered and the flow path through the confluence channel is relatively long. By increasing the flow resistance structure, the flow velocity can be reduced and the heat exchange time can be increased. As the fluid gradually flows through multiple second heat exchangers 120, the flow path through the confluence channel becomes longer, and the fluid velocity will naturally slow down. Therefore, reducing the flow resistance structure in the second heat exchanger 120 far from the inlet can avoid excessively hindering the fluid flow and ensure that the fluid can pass smoothly through the entire heat exchange device.

[0123] In one possible implementation, referring to Figures 3 and 5, a turbulent flow section is provided in the middle of the second heat exchanger 120.

[0124] As can be clearly seen from Figures 3 and 5, the connection point between the second heat exchanger 120 and the manifold is typically located in the middle of the second heat exchanger 120, where the flow is split to divide the second heat exchanger 120 into two separate channels. Based on the above theory, the connection point between the second heat exchanger 120 and the manifold is located in the middle of the second heat exchanger 120, where it is easier to receive a larger fluid flow rate and has a smaller pressure drop loss. In addition, the cells in the middle of the battery pack are far from the side beams of the battery pack support 700 (see Figures 11 and 12), making it difficult to transfer more heat over a large area. Therefore, based on the above theory, in this embodiment, the turbulence section is set in the middle of the second heat exchanger 120 to increase the flow resistance in the middle of the second heat exchanger 120, thereby extending the heat exchange time with the battery 200 and ensuring the balance of heat exchange capacity in each area of ​​the second heat exchanger 120.

[0125] In addition, in this example, the two flow channels are symmetrically arranged relative to the turbulence section, so that the flow path of the two flow channels is the same, thus ensuring the balance of heat exchange capacity in each region of the second heat exchanger 120 as much as possible.

[0126] Please continue to refer to Figures 6 to 8. In one possible implementation, the flow resistance structure 400 includes a flow splitting node, wherein the heat exchange channel of the heat exchanger 100 includes multiple interconnected flow segments, and a flow splitting node is formed between two adjacent flow segments.

[0127] Along the first direction and away from the liquid inlet, the number of flow splitting nodes in the plurality of first heat exchangers 110 increases. These flow splitting nodes are used to divide the heat exchange channel into multiple interconnected flow segments, so that flow splitting nodes are formed between adjacent flow segments.

[0128] The more flow splitting nodes there are, the more flow segments the heat exchange channel of the first heat exchanger 110 is divided into. Compared with the original heat exchange channel, the friction length of each flow segment is shorter, which can reduce the pressure drop of each flow segment and reduce the flow resistance of the fluid.

[0129] Since the flow path of the heat exchanger 110 near the liquid inlet 300 is shorter than that of the heat exchanger 110 away from the liquid inlet 300, the flow resistance of the heat exchanger 110 away from the liquid inlet 300 is too large, affecting the uniformity of heat exchange capacity of each heat exchanger 110. Therefore, in this embodiment, by increasing the number of flow branching nodes in the multiple heat exchangers 110 along the first direction and away from the liquid inlet 300, the uniformity of heat exchange capacity of each heat exchanger 110 can be improved.

[0130] In one possible implementation, along the first direction and away from the liquid inlet, in any two adjacent first heat exchangers 110, the number of flow resistance structures 400 in the first heat exchanger 110 closer to the liquid inlet 300 is less than or equal to the number of flow resistance structures 400 in the first heat exchanger 110 away from the liquid inlet 300. Furthermore, while maintaining an overall increasing trend, in any two adjacent first heat exchangers 110, the number of flow resistance structures 400 in the preceding first heat exchanger 110 is less than or equal to the number of flow resistance structures 400 in the following first heat exchanger 110.

[0131] For example, along the first direction and away from the liquid inlet, the number of flow resistance structures 400 in the plurality of first heat exchangers 110 gradually increases. Referring to Figure 7, along the first direction and from bottom to top, the number of flow splitting nodes in the first first heat exchanger 110 is 2, the number of flow splitting nodes in the second first heat exchanger 110 is 3, the number of flow splitting nodes in the third first heat exchanger 110 is 4, and the number of flow splitting nodes in the fourth first heat exchanger 110 is 5.

[0132] This configuration ensures that the flow rate of each first heat exchanger 110 is the same as possible, so that the heat exchange capacity of each first heat exchanger 110 is consistent, thereby achieving temperature uniformity in the first heating zone of each battery 200.

[0133] It should be noted that the flow splitting node can be set not only in the first heat exchanger 110, but also in the second heat exchanger 120. For example, the second heat exchanger 120 is provided with a flow resistance structure 400; along the first direction and away from the liquid inlet, the number of flow resistance structures 400 in the multiple second heat exchangers 120 is equal. This arrangement ensures that the flow rate of each second heat exchanger 120 is the same, making the heat exchange capacity of each second heat exchanger 120 consistent, thereby achieving temperature uniformity in the second heating zone of each battery 200.

[0134] This embodiment independently sets the flow resistance structure 400 in the first heat exchanger 110 and the second heat exchanger 120, thereby quantifying the flow resistance of the first heat exchanger 110 and the second heat exchanger 120 in a targeted manner, thus providing a faster flow distribution adjustment.

[0135] In one possible implementation, referring to Figures 2 and 6, the heat exchange device further includes a first confluence channel 150 and a second confluence channel 160; the first confluence channel 150 is connected to the first heat exchanger 110, and the second confluence channel 160 is connected to the second heat exchanger 120.

[0136] It should be noted that both the first manifold 150 and the second manifold 160 include at least two channels, one of which serves as the inlet manifold and the other as the outlet manifold. This ensures that the fluid circulates in the first heat exchanger 110 and the second heat exchanger 120, thereby guaranteeing the heat exchange function of the heat exchanger 100.

[0137] In this embodiment, the first manifold 150 can be directly connected to the first heat exchanger 110 or indirectly connected. At the same time, the second manifold 160 can be directly connected to the second heat exchanger 120 or indirectly connected.

[0138] For example, at least one of the first manifold 150 and the second manifold 160 is connected to the heat exchanger 100 via a bridging structure 600. This arrangement allows for a reasonable layout of the first manifold 150, the second manifold 160, and the heat exchange channels of the heat exchanger 100, thereby making efficient use of the layout space.

[0139] It should be noted that the design of which of the first and second flow channels 150 is connected to the heat exchanger 100 via the bridging structure 600 depends on the layout of the first and second flow channels 150.

[0140] For example, at least one of the first manifold 150 and the second manifold 160 is disposed in a different layer from the heat exchanger; wherein the manifold disposed in a different layer from the heat exchanger 100 is connected by a bridging structure 600.

[0141] In this embodiment, the heat exchange channel of the heat exchanger 100 can be formed by a flow channel plate 130 and a heat spreader plate 140. For example, the heat exchanger 100 includes a flow channel plate 130 and a heat spreader plate 140 stacked together, with the heat spreader plate 140 disposed on the flow channel plate 130 and forming an integral part with the flow channel plate 130.

[0142] As an example, referring to Figure 9, one of the first manifold 150 and the second manifold 160 is disposed in a different layer from the heat exchanger 100. For example, the second manifold 160 is disposed in the same layer as the heat exchanger 100, while the first manifold 150 is disposed in a different layer from the heat exchanger 100. The second manifold 160 and the heat exchanger 100 are disposed between the flow channel plate 130 and the heat spreader plate 140. In other words, the first manifold 150 can be an independent component. This arrangement allows for free configuration of the formation and structure of the first manifold 150, improving the design flexibility of the heat exchanger 100.

[0143] The formation of the first manifold 150 can be varied. For example, the first manifold 150 can be formed by a manifold welded to the heat exchanger 140. Alternatively, the heat exchanger 100 may include an auxiliary plate, which is stacked on the side of the heat exchanger 140 opposite to the flow channel plate 130; for example, the auxiliary plate may be disposed on the side of the heat exchanger 140 opposite to the flow channel plate 130. In this example, the auxiliary plate can be fixed to the heat exchanger 140 by welding to improve the connection stability between the auxiliary plate and the flow channel plate 140.

[0144] The first flow channel 150 is located between the auxiliary plate and the heat exchanger plate 140. For example, the first flow channel 150 can be formed on the auxiliary plate by a stamping process. When the heat exchanger plate 140 is placed on the auxiliary plate, a closed first flow channel 150 is formed between the auxiliary plate and the heat exchanger plate 140. In this embodiment, the stacked arrangement of the auxiliary plate and the heat exchanger plate 140 makes the design of the heat exchanger more compact, effectively utilizes the internal space, reduces the volume and weight of the heat exchanger, and adapts to different application scenarios and operating conditions.

[0145] In this embodiment, the first confluence channel 150 and the second confluence channel 160 formed between the auxiliary plate and the heat exchange plate 140 are directly opposite each other. When the working fluid is flowing during thermal management, the first confluence channel 150 and the second confluence channel 160 are separated by the heat exchange plate 140 and do not come into contact with other structures of the support 700, the battery 200 and other structures of the heat exchange component, effectively avoiding the loss of cold / heat caused by unnecessary heat exchange.

[0146] To facilitate communication between the first manifold 150 and the heat exchange channel of the first heat exchanger, please refer to Figure 9. In this embodiment, the heat spreader 140 has a connecting hole that connects the first manifold 150 and the first heat exchanger 110, forming a bridging structure 600. This embodiment simplifies the manufacturing process, reduces processing steps, improves production efficiency, and lowers manufacturing costs through the connecting hole. It also ensures effective heat transfer between different channels, reduces heat transfer resistance, and improves the heat transfer efficiency and performance of the heat exchanger.

[0147] As another example, please refer to Figures 10 and 11. The first confluence channel 150 and the second confluence channel 160 are both arranged in different layers from the heat exchange channel of the heat exchanger 100. The first confluence channel 150 is connected to the first heat exchanger 110 through the bridging structure 600, and the second confluence channel 160 is connected to the second heat exchanger 120 through the bridging structure 600.

[0148] In one possible implementation, along the stacking direction of the first manifold 150 and the heat exchanger 100, the orthographic projection of the first manifold 150 onto the plane containing the second manifold 160 at least partially coincides with the second manifold 160. That is, the orthographic projection of the first manifold 150 onto the plane containing the second manifold 160 at least partially coincides with the second manifold 160. It should be understood that "at least partially coincident" in this example can be interpreted as partial coincidence or complete coincidence.

[0149] This configuration avoids the first and second busbar channels 150 from being laid flat in the horizontal direction, reducing the area occupied by the busbar channels and thus maximizing the area occupied by the heat exchanger channels. Furthermore, it ensures that the channels corresponding to the battery are already divided heat exchange channels, reducing the impact of the busbar channels on temperature differences in different areas of the battery, improving the thermal uniformity of different areas of the battery, and enhancing the safety of the battery pack.

[0150] In one possible implementation, referring to Figures 6 to 8, the first confluence channel 150, the second confluence channel 160, and the heat exchanger 100 are arranged in the same layer. The heat exchange channels of the first confluence channel 150, the second confluence channel 160, and the heat exchanger 100 are all formed between the flow channel plate 130 and the heat equalization plate 140.

[0151] In the first flow channel 150 and the second flow channel 160 located in the first direction and on the same side of the heat exchanger 100, the first flow channel 150 is located on the side of the second flow channel 160 away from the heat exchanger 100.

[0152] The first manifold 150 is connected to the first heat exchanger 110 via the bridging structure 600, and the second manifold 160 is connected to the second heat exchanger 120.

[0153] The first manifold 150 is connected to the first heat exchanger 110 via a bridging structure 600, and the second manifold 160 is connected to the second heat exchanger 120. Thus, without changing the position of the second manifold 160, the first manifold 150 can be connected to the first heat exchanger 110, ensuring that the working fluid can flow into the first heat exchanger 110, thereby enabling the first heat exchanger 110 to have heat exchange capabilities. Furthermore, the connection between the first manifold 150 and the first heat exchanger 110 via the bridging structure 600 also makes the heat exchanger structure more compact, helping to save space and making it suitable for applications requiring efficient heat exchange but with limited space.

[0154] In addition, in other embodiments, in the first flow channel 150 and the second flow channel 160 located in the first direction and on the same side of the heat exchanger 100, the second flow channel 160 is located on the side of the first flow channel 150 away from the heat exchanger 100, the second flow channel 160 is connected to the second heat exchanger 120 through the bridging structure 600, and the first flow channel 150 is connected to the first heat exchanger 110.

[0155] It should be noted that the bridging structure 600 in this embodiment may include a bridging plate, which is disposed on the side of the heat spreader 140 facing away from the flow channel plate 130. The bridging plate and the heat spreader 140 form a bridging flow channel. To facilitate the connection between the bridging flow channel and the heat exchange flow channel of the first manifold 150 and the first heat exchanger 110, this embodiment provides a first connecting hole (not shown in the figure) and a second connecting hole (not shown in the figure) on the heat spreader 140, wherein the first connecting hole and the second connecting hole are spaced apart. One end of the bridging flow channel is connected to the first manifold 150 through the first connecting hole, and the other end of the bridging flow channel is connected to the heat exchange flow channel of the first heat exchanger 110 through the second connecting hole, thereby realizing the connection between the first manifold 150 and the heat exchange flow channel of the first heat exchanger 110. It should be noted that the heat exchange device in this example can be applied to a battery pack for heat exchange with the battery 200. To support the batteries and heat exchange devices, the battery pack typically includes a support member 700, which includes accommodating cavities for receiving batteries 200. The number of accommodating cavities in the support member 700 matches the number of batteries 200, ensuring that at least one battery 200 is placed in each cavity, thereby improving the neatness of the battery pack.

[0156] In this example, the support 700 also includes a side beam, wherein the first confluence channel 150 and the second confluence channel 160, in their orthographic projections onto the support 700, cover at least a portion of the side beam. Given that the first confluence channel 150 and the second confluence channel 160 are typically inlet or outlet confluence channels, and these channels are used for heat exchange across the entire battery 200, they cannot be divided according to a dual-control channel design. Furthermore, the heat exchange between these channels and the battery 200 also affects the overall uniformity of the battery. Therefore, in this embodiment, the first confluence channel 150 and the second confluence channel 160 are typically placed outside the battery 200, such that the first confluence channel 150 and the second confluence channel 160, in their orthographic projections onto the support 700, cover at least a portion of the side beam. This arrangement facilitates the layout of the first heat exchanger 110 and the second heat exchanger 120, enabling the first heat exchanger 110 to exchange heat on the first heating zone with higher heat generation, and the second heat exchanger 120 to exchange heat on the second heating zone with lower heat generation. This results in a more uniform and efficient heat exchange effect, which in turn helps maintain the temperature consistency of the battery, extends the battery life, and improves the battery performance.

[0157] It should be noted that the first confluence channel 150 and the second confluence channel 160, when projected onto the support member 700, cover at least a portion of the side beam. This can be understood as the first confluence channel 150 and the second confluence channel 160, when projected onto the support member 700, covering the entire side beam, or a portion thereof.

[0158] A recessed area is provided on the side beam, wherein the recessed area constitutes a bridging channel for the bridging component, or at least partially constitutes a bridging structure 600. In one example, the recessed area constitutes a bridging channel for the bridging structure 600, thus reducing the need for additional components, simplifying the overall structural design, reducing the weight of the battery pack, and improving the energy density of the battery. In another example, the recessed area at least partially accommodates the bridging structure 600, thereby protecting the bridging structure 600 from external physical damage and environmental influences, helping to extend the service life of the bridging structure 600 and improve the reliability of the battery pack. Furthermore, the bridging structure 600 is opposite to the side beam and offset from the battery 200 to ensure that the bridging structure 600 does not affect the heat dissipation of the battery 200.

[0159] In addition, the recessed area accommodates at least part of the bridging structure 600. On the one hand, this reduces the height of the battery pack; on the other hand, it frees up more internal space for the arrangement of other components, improving space utilization.

[0160] In one possible implementation, a gap exists between the bridging structure 600 and the inner wall of the recessed area. For example, if the distance between the surface of the bridging structure 600 facing away from the heat exchanger 100 and the heat exchanger 100 along the thickness direction of the support 700 is 4 mm, then the distance between the bottom wall of the recessed area and the heat exchanger is greater than 4 mm. This configuration, on the one hand, allows the bridging structure 600 a certain degree of freedom during thermal expansion and contraction, thereby reducing the impact of thermal stress on the bridging structure 600 and the recessed area, which helps to extend the service life of the battery pack and improve its reliability; on the other hand, it can play a role in shock absorption and vibration reduction, reducing the mechanical stress experienced by the bridging structure 600 during operation, which helps to improve the stability and durability of the battery pack.

[0161] In other embodiments, the bridging structure 600 may also be disposed between the battery 200 and the side beam, i.e., there is a gap between the battery 200 and the side beam, which can be used to accommodate the bridging structure 600.

[0162] In other possible implementations, please refer to Figures 6 and 10, the second liquid outlet manifold 153 and the fourth liquid outlet manifold 163 are located in the middle of the heat exchanger in the second direction, or the first manifold 150 is located in the middle of the heat exchanger in the second direction.

[0163] The support member 700 also includes a central beam extending in a first direction, which is located between two side beams spaced apart in a second direction; for example, the central beam is located in the middle of the support member 700.

[0164] In one example, both the second liquid outlet manifold 153 and the fourth liquid outlet manifold 163 are formed on the intermediate beam. For example, the intermediate beam has two grooves extending along a second direction; the two grooves respectively constitute the second liquid outlet manifold 153 and the fourth liquid outlet manifold 163. This arrangement simplifies the second liquid outlet manifold 153 and the fourth liquid outlet manifold 163, thereby simplifying the fabrication of the heat exchanger and reducing its production cost.

[0165] Furthermore, in other embodiments, the groove accommodates the second liquid outlet manifold 153 and the fourth liquid outlet manifold 163. That is, the second liquid outlet manifold 153 and the fourth liquid outlet manifold 163 can also be constructed from additional components, and the groove merely provides space to accommodate these additional components. For example, the heat exchanger may include a liquid return component positioned on the side of the heat spreader away from the flow channel plate, thereby forming the second liquid outlet manifold 153 and the fourth liquid outlet manifold 163 between the liquid return component and the heat spreader. In this case, the groove accommodates at least a portion of the liquid return component. This approach reduces the height of the battery pack and frees up more internal space for the arrangement of other components, improving space utilization.

[0166] In one example, a groove is provided on the intermediate beam for accommodating the liquid outlet or liquid inlet of the second manifold 160.

[0167] During operation, the superheat at the heat exchanger outlet is typically controlled to ensure normal compressor operation. Therefore, the flow channels here often overheat. Consequently, it's necessary to consider placing the outlet manifolds 153 and 163 (or 160) in locations where the battery 200 is not located. For example, the outlet manifolds 153 and 163 (or 160) can be positioned on the intermediate beam. This arrangement ensures that even if the temperatures of the outlet manifolds 153 and 163 (or 160) become excessively high, it will not affect battery heat exchange, preventing overheating and improving battery temperature uniformity. On the other hand, given the large size of the intermediate beam, in this embodiment, the second liquid outlet manifold 153 and the fourth liquid outlet manifold 163 or the second manifold 160, the first liquid return manifold 370 and the second liquid return manifold 380 are set on the intermediate beam, which can avoid occupying the space of the side beam.

[0168] In other embodiments, referring to Figures 12 and 13, the support member 700 includes a first region 710 and a second region 720, with the second region 720 disposed on at least one side of the first region 710. For example, the second region 720 may be disposed on one side of the first region 710, or on both sides of the first region 710, or even around the first region 710.

[0169] The first region 710 is used to support the battery 200, that is, the battery 200 is disposed on the first region 710. The second region 720 can be a fixing area for the support member 700, which can be installed onto the target component. It should be noted that the first region 710 can be the area below the dashed line in Figure 12, and the second region 720 can be the area above the dashed line in Figure 13.

[0170] Please refer to Figures 12 and 13. The heat exchanger is disposed on the support member 700. For example, the heat exchanger is disposed on the side of the support member 700 opposite to the battery 200. The heat exchanger is in contact with the battery 200 and exchanges heat with the battery 200.

[0171] In this design, the orthographic projection of the heat exchanger's heat exchange channels onto the surface of the support 700 at least covers the first region 710, and the orthographic projection of the heat exchanger's confluence channels onto the surface of the support 700 is located in the second region 720. This arrangement ensures that the orthographic projection of the confluence channels onto the surface of the support 700 is offset from that of the battery 200, avoiding direct contact with the battery 200. This configuration, on the one hand, increases the space of the heat exchange channels, improving the heat exchanger's heat exchange capacity; on the other hand, it ensures that the channels corresponding to the battery 200 are all heat exchange channels with pre-diverted flow, reducing the impact of the confluence channels on the temperature difference between different regions of the battery 200, improving the heat balance between different regions of the battery 200, and enhancing the safety of the battery pack.

[0172] In one possible implementation, referring to Figures 12 and 13, the heat exchanger is connected to the first region 710, and the heat exchanger and the first region 710 have a connection point 730. The connection point 730 can be a bolt hole; for example, aligned bolt holes can be formed on the heat exchanger and the first region 710, and bolts are used to connect the aligned bolt holes together, thereby achieving a fixed connection between the heat exchanger and the support member 700. This embodiment, by connecting the heat exchanger and the support member 700 together with bolts, reduces the risk of loosening or detachment due to vibration or other external forces.

[0173] The confluence channel has a preset distance between its orthographic projection on the surface of the support member 700 and the connection point 730. This preset distance can be greater than the safe distance between the outer circumference of the bolt facing the heat exchange channel and the heat exchange channel itself. Thus, the offset arrangement of the confluence channel's orthographic projection on the surface of the support member 700 and the battery 200 maximizes the space of the heat exchange channel, improving the heat exchanger's heat exchange capacity. It also ensures that the channels corresponding to the battery 200 are all heat exchange channels with pre-diverted flow, guaranteeing temperature uniformity across all areas of the battery 200.

[0174] It is important to understand that there is a preset distance between the orthographic projection of the manifold channel on the surface of the support 700 and the connection point 730. This preset distance can be greater than the safe distance between the outer circumference of the bolt facing the heat exchange channel and the heat exchange channel. For example, the manifold channel is spaced apart from the connection point 730 on the surface of the support 700. This increases the distance between the manifold channel and the connection point 730, preventing the bolt from damaging the manifold channel, thereby preventing fluid leakage and improving the safety of the battery pack.

[0175] In one possible implementation, referring to Figures 2 to 11, the heat exchange device further includes a liquid outlet 500, which and the liquid inlet 300 are located on the same side of the heat exchanger 100; and the liquid outlet 500 and the liquid inlet 300 are spaced apart along a second direction; the second direction intersects the first direction.

[0176] The first direction can be the X direction in the attached diagram, and the second direction can be the Y direction in the attached diagram. This configuration optimizes the layout of each heat exchange channel, thereby optimizing the flow path of the fluid in the heat exchange channels of the heat exchanger 100, which helps to distribute the fluid evenly and thus improves the heat exchange efficiency of the heat exchange device.

[0177] It should be understood that, in order to facilitate independent control of the first heat exchanger 110 and the second heat exchanger 120, the liquid outlet 500 disclosed in this embodiment may include a first liquid outlet 510 and a second liquid outlet 520, which are relatively independent; the liquid inlet 300 includes a first liquid inlet 310 and a second liquid inlet 320 that are independent of each other.

[0178] The first liquid inlet 310 and the first liquid outlet 510 are respectively connected to the liquid inlet and liquid outlet of the first heat exchanger 110, and the second liquid inlet 320 and the second liquid outlet 520 can be respectively connected to the liquid inlet and liquid outlet of the second heat exchanger 120. In this embodiment, the liquid inlet 300 and the liquid outlet 500 can be located on the same side of the heat exchanger 100 in the first direction, which can optimize the layout of the heat exchanger 100, the liquid outlet 500 and the liquid inlet 300 of the heat exchange device, making the layout of the heat exchange device more compact.

[0179] In one possible implementation, the first manifold 150 includes a first inlet manifold 151, a first outlet manifold 152, and a second outlet manifold 153; along the second direction, the first inlet manifold 151 and the first outlet manifold 152 are disposed on both sides of the heat exchanger 100, and the second outlet manifold 153 is located in the middle of the heat exchanger 100.

[0180] The liquid inlet of each first heat exchanger 110 is connected to the liquid inlet 300 through the first liquid inlet manifold 151; for example, the liquid inlet of each first heat exchanger 110 is connected to the first liquid inlet 310 through the first liquid inlet manifold 151. The liquid outlet of each first heat exchanger 110 is connected to the liquid outlet 500 through the first liquid outlet manifold 152 and the second liquid outlet manifold 153 in sequence; for example, the liquid outlet of each first heat exchanger 110 is connected to the first liquid outlet 510 through the first liquid outlet manifold 152 and the second liquid outlet manifold 153 in sequence.

[0181] The second manifold 160 includes a second liquid inlet manifold 161, a third liquid outlet manifold 162, and a fourth liquid outlet manifold 163. Along the second direction, the second liquid inlet manifold 161 and the third liquid outlet manifold 162 are disposed on both sides of the heat exchanger 100, and the fourth liquid outlet manifold 163 is located in the middle of the heat exchanger 100. The liquid inlet end of each second heat exchanger 120 is connected to the liquid inlet 300 through the second liquid inlet manifold 161. For example, the liquid inlet end of each second heat exchanger 120 is connected to the second liquid inlet 320 through the second liquid inlet manifold 161. The liquid outlet of each second heat exchanger 120 is connected to the liquid outlet 500 in sequence through the third liquid outlet manifold 162 and the fourth liquid outlet manifold 163. For example, the liquid outlet of the second heat exchanger 120 is connected to the second liquid outlet 520 in sequence through the third liquid outlet manifold 162 and the fourth liquid outlet manifold 163.

[0182] It should be noted that the middle part can be understood as the region adjacent to the axis of the heat exchanger 100 extending along the second direction. Among them, the first liquid outlet manifold 152 and the second liquid outlet manifold 153 can be directly connected or indirectly connected; and the third liquid outlet manifold 162 and the fourth liquid outlet manifold 163 can be directly connected or indirectly connected.

[0183] For example, the heat exchange device further includes a first connecting manifold 181 and a second connecting manifold 182, the first connecting manifold 181 and the second connecting manifold 182 are located on the side of the heat exchanger 100 away from the liquid inlet 300 and extend along a second direction; the first liquid outlet manifold 152 is connected to the second liquid outlet manifold 153 through the first connecting manifold 181; the third liquid outlet manifold 162 is connected to the fourth liquid outlet manifold 163 through the second connecting manifold 182.

[0184] This embodiment, through the reasonable layout of the first confluence channel 150, the second confluence channel 160, the first connecting confluence channel 181, and the second connecting confluence channel 182, can ensure that the flow path of each first heat exchanger 110 and each second heat exchanger 120 is basically the same, thereby improving the balance of the heat exchange capacity of each first heat exchanger 110 and each second heat exchanger 120.

[0185] To facilitate the explanation of how a reasonable layout of the first confluence channel 150, the second confluence channel 160, the first connecting confluence channel 181, and the second connecting confluence channel 182 ensures that the heat exchange capabilities of multiple heat exchangers 100 are substantially the same, the following embodiment will use a heat exchange device comprising four heat exchangers 100, each heat exchanger 100 including two first heat exchangers 110 and one second heat exchanger 120 as an example. Referring to Figures 7 and 8, the eight first heat exchangers 110 are respectively designated as regions A1, A2, A3, A4, A5, A6, A7, and A8; and the four second heat exchangers 120 are respectively designated as regions B1, B2, B3, and B4.

[0186] For region A1: the fluid enters the first inlet manifold 151 through the first inlet port 310, flows into region A1 at the first branching point, then flows out from the left side of region A1, flows upward through the first outlet manifold 152 on the left side, and finally flows to the first outlet port 510 through the second outlet manifold 153 in the middle.

[0187] For region A2: the fluid enters the first inlet manifold 151 through the first inlet port 310, flows into region A2 at the second branching point, then flows out from the left side of region A2, flows upward through the first outlet manifold 152 on the left side, and finally flows to the first outlet port 510 through the second outlet manifold 153 in the middle.

[0188] By comparing the fluid's path along region A1 and region A2, it can be seen that the fluid travels less along the dashed line a1 but more along the dashed line a2 during its flow in region A1. Therefore, the fluid's path along the first inlet manifold 151 and the first outlet manifold 152 is complementary, so that the fluid's path along region A1 and region A2 is basically the same.

[0189] This process continues, ensuring that the fluid travels along the same path in region A1 as in region A2, and so on, until the fluid travels along the same path in region A8, so as to guarantee that the flow rates in regions A1 through A8 are the same.

[0190] It should be noted that the flow path design concept of area B is the same as that of area A, which can also ensure that the flow rate of areas B1 to B4 is the same.

[0191] This application provides a battery pack. Please continue to refer to Figure 1. This application also provides a battery pack, including a battery 200 and a heat exchange device described in any of the above embodiments. The heat exchange device exchanges heat with the battery 200 to heat the battery 200.

[0192] Given that the battery pack in this embodiment includes the heat exchange device described in any of the above embodiments, it possesses the structure and beneficial effects of the heat exchange device, and will not be described in detail here.

[0193] This application also provides an electrical device, including an electrical device and a battery pack as described in any of the above embodiments, the battery pack being used to provide electrical energy to the electrical device.

[0194] The electrical equipment in this application embodiment can be a vehicle, such as a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle, and a new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Accordingly, the electrical device can be the vehicle's drive mechanism or the vehicle's control system.

[0195] In addition, electrical equipment can also serve as other energy storage devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft. Among these, spacecraft can include airplanes, rockets, space shuttles, or spacecraft.

[0196] Since the electrical device in this embodiment includes the battery pack described in any of the above embodiments, the electrical device includes the battery pack structure and beneficial effects, which will not be described in detail here.

[0197] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0198] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0199] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heat exchange device, wherein, Includes a heat exchanger (100), which includes a first heat exchanger (110) and a second heat exchanger (120) that are independent of each other, wherein the first heat exchanger (110) is at least disposed on one side of the second heat exchanger (120); The first heat exchanger (110) is used to exchange heat with the first heating zone (210) of the battery (200), and the second heat exchanger (120) is used to exchange heat with the second heating zone (220) of the battery (200). The heat generation of the first heating zone (210) is greater than the heat generation of the second heating zone (220). The first heat exchanger (110) is provided with a flow resistance structure (400).

2. The heat exchange device according to claim 1, wherein, The first heat exchanger (110) includes a first sub-heat exchanger (111) and a second sub-heat exchanger (112), and the first sub-heat exchanger (111) and the second sub-heat exchanger (112) are respectively disposed on both sides of the second heat exchanger (120); At least one of the first sub-heat exchanger (111) and the second sub-heat exchanger (112) is provided with a flow resistance structure (400).

3. The heat exchange device according to claim 1 or 2, wherein, The heat exchanger (100) includes a plurality of heat exchangers, which are arranged sequentially along a first direction and connected in parallel with each other; each heat exchanger (100) is used to exchange heat with each battery (200); Multiple first heat exchangers (110) are connected in parallel, and multiple second heat exchangers (120) are connected in parallel.

4. The heat exchange device according to claim 3, wherein, The heat exchange device includes a liquid inlet (300); in the first direction, the liquid inlet (300) is disposed on one side of the heat exchanger; The liquid inlet (300) is connected to the liquid inlet of the first heat exchanger (110) and the liquid inlet of the second heat exchanger (120), respectively.

5. The heat exchange device according to any one of claims 1-4, wherein, Along the first direction and away from the liquid inlet (300), the number of the flow resistance structures (400) in the plurality of first heat exchangers (110) tends to decrease.

6. The heat exchange device according to any one of claims 1-5, wherein, Along the first direction and away from the liquid inlet (300), among the plurality of first heat exchangers (110), except for the first heat exchanger (110) furthest from the liquid inlet (300), in any two adjacent first heat exchangers (110), the number of flow resistance structures (400) of the first heat exchanger (110) closer to the liquid inlet (300) is greater than or equal to the number of flow resistance structures (400) of the first heat exchanger (110) furthest from the liquid inlet (300).

7. The heat exchange device according to claim 6, wherein, Among the plurality of first heat exchangers (110), the number of flow resistance structures (400) in the first heat exchanger (110) furthest from the liquid inlet (300) is greater than the number of flow resistance structures (400) in the first heat exchanger (110) furthest from the liquid inlet (300).

8. The heat exchange device according to any one of claims 2-7, wherein, In the first heat exchanger (110) furthest from the liquid inlet (300), the flow resistance structure (400) is disposed in the second sub-heat exchanger (112).

9. The heat exchange device according to any one of claims 2-8, wherein, The flow resistance structure (400) includes a turbulence section, through which the fluid velocity is less than that of the fluid velocity in the other sections of the heat exchange channel of the heat exchanger.

10. The heat exchange device according to claim 9, wherein, Along the first direction and away from the liquid inlet (300), the number of turbulent flow sections in the plurality of first sub-heat exchangers (111) tends to decrease.

11. The heat exchange device according to claim 10, wherein, In any two adjacent first sub-heat exchangers (111), the number of turbulent flow sections in the first sub-heat exchanger (111) closer to the liquid inlet (300) is greater than or equal to the number of turbulent flow sections in the first sub-heat exchanger (111) farther from the liquid inlet (300).

12. The heat exchange device according to any one of claims 9-11, wherein, Along the first direction and away from the liquid inlet (300), the number of turbulent flow sections in the plurality of second sub-heat exchangers (112) shows a trend of first decreasing and then increasing.

13. The heat exchange device according to any one of claims 2-12, wherein, In any two adjacent heat exchangers (100), the adjacent second sub-heat exchanger (112) is symmetrically arranged with the first sub-heat exchanger (111).

14. The heat exchange device according to any one of claims 2-13, wherein, The second heat exchanger (120) is provided with a flow resistance structure (400).

15. The heat exchange device according to claim 14, wherein, Multiple second heat exchangers (120) have the same structure.

16. The heat exchange device according to claim 14, wherein, Along the first direction and away from the liquid inlet, the number of flow resistance structures (400) in the plurality of second heat exchangers (120) tends to decrease.

17. The heat exchange device according to any one of claims 14-16, wherein, The flow resistance structure (400) includes a turbulent flow section; in the second heat exchanger (120), the turbulent flow section is disposed in the middle of the heat exchange channel of the second heat exchanger (120).

18. The heat exchange device according to any one of claims 1-4, wherein, The flow resistance structure (400) includes a flow splitting node; Along the first direction and away from the liquid inlet, the number of the diversion nodes in the plurality of the first heat exchangers (110) tends to increase.

19. The heat exchange device according to claim 18, wherein, Along the first direction and away from the liquid inlet, in any two adjacent first heat exchangers (110), the number of flow resistance structures (400) in the first heat exchanger (110) closer to the liquid inlet (300) is less than or equal to the number of flow resistance structures (400) in the first heat exchanger (110) away from the liquid inlet (300).

20. The heat exchange device according to claim 18 or 19, wherein, The second heat exchanger (120) is provided with a flow resistance structure (400); Along the first direction and away from the liquid inlet, the number of flow resistance structures (400) in the plurality of second heat exchangers (120) is equal.

21. The heat exchange device according to any one of claims 18-20, wherein, The heat exchanger (100) includes multiple interconnected flow sections, with a flow splitting node formed between two adjacent flow sections.

22. The heat exchange device according to any one of claims 1-21, wherein, The heat exchange device further includes a first confluence channel (150) and a second confluence channel (160); the first confluence channel (150) is connected to the first heat exchanger (110), and the second confluence channel (160) is connected to the second heat exchanger (120).

23. The heat exchange device according to claim 22, wherein, At least one of the first confluence channel (150) and the second confluence channel (160) is connected to the heat exchanger (100) via a bridging structure (600).

24. The heat exchange device according to claim 23, wherein, At least one of the first and second confluence channels (150) is disposed in a different layer from the heat exchanger (100); The confluence channel, which is disposed in a different layer from the heat exchanger (100), is connected by a bridging structure (600).

25. The heat exchange device according to claim 24, wherein, Along the stacking direction of the first confluence channel (150) and the heat exchanger (100), the orthographic projection of the first confluence channel (150) onto the plane where the second confluence channel (160) is located at least partially coincides with the second confluence channel (160).

26. The heat exchange device according to claim 22, wherein, The first confluence channel (150), the second confluence channel (160), and the heat exchanger (100) are arranged in the same layer; In the first confluence channel (150) and the second confluence channel (160) located in the first direction and on the same side of the heat exchanger (100), the first confluence channel (150) is located on the side of the second confluence channel (160) away from the heat exchanger (100); The first confluence channel (150) is connected to the first heat exchanger (110) through a bridging structure (600), and the second confluence channel (160) is connected to the second heat exchanger (120).

27. The heat exchange device according to claim 26, wherein, The heat exchange device further includes a liquid outlet (500), the liquid outlet (500) and the liquid inlet (300) are located on the same side of the heat exchanger (100); and along the second direction, the liquid outlet (500) and the liquid inlet (300) are spaced apart; the second direction intersects the first direction.

28. The heat exchange device according to claim 27, wherein, The first manifold (150) includes a first inlet manifold (151), a first outlet manifold (152), and a second outlet manifold (153); Along the second direction, the first liquid inlet manifold (151) and the first liquid outlet manifold (152) are disposed on both sides of the heat exchanger (100), and the second liquid outlet manifold (153) is located in the middle of the heat exchanger (100). The liquid inlet end of each of the first heat exchangers (110) is connected to the liquid inlet (300) through the first liquid inlet manifold (151); The liquid outlet of each of the first heat exchangers (110) is connected to the liquid outlet (500) in sequence through the first liquid outlet manifold (152) and the second liquid outlet manifold (153).

29. The heat exchange device according to claim 28, wherein, The second manifold (160) includes a second inlet manifold (161), a third outlet manifold (162), and a fourth outlet manifold (163); Along the second direction, the second liquid inlet manifold (161) and the third liquid outlet manifold (162) are disposed on both sides of the heat exchanger (100), and the fourth liquid outlet manifold (163) is located in the middle of the heat exchanger (100); The liquid inlet end of each of the second heat exchangers (120) is connected to the liquid inlet (300) through the second liquid inlet manifold (161); The liquid outlet of each of the second heat exchangers (120) is connected to the liquid outlet (500) in sequence through the third liquid outlet manifold (162) and the fourth liquid outlet manifold (163).

30. The heat exchange device according to claim 29, wherein, The heat exchange device further includes a first connecting flow channel (181) and a second connecting flow channel (182), the first connecting flow channel (181) and the second connecting flow channel (182) being located on the side of the heat exchanger (100) away from the liquid inlet (300) and extending along a second direction; The first liquid outlet manifold (152) is connected to the second liquid outlet manifold (153) through the first connecting manifold (181); The third liquid outlet manifold (162) is connected to the fourth liquid outlet manifold (163) through the second connecting manifold (182).

31. A battery pack, wherein, It includes the heat exchange device and battery (200) according to any one of claims 1-30, wherein the heat exchange device exchanges heat with the battery (200).

32. An electrical appliance, wherein, It includes an electrical device and a battery pack as described in claim 31, the battery pack being electrically connected to the electrical device for providing electrical energy to the electrical device.

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