Heat exchange apparatus, battery pack and electric device

Abstract

Embodiments of the present disclosure provide a heat exchange apparatus, a battery pack, and an electric device. The heat exchange apparatus comprises a liquid inlet and a plurality of cooling areas, wherein the plurality of cooling areas are sequentially arranged in a first direction, and each cooling area is provided with a flow channel; in the first direction, the liquid inlet is located on one side of the plurality of cooling areas, and is separately communicated with liquid inlet ends of the cooling areas; in the first direction, flow channels of the cooling areas among the plurality of cooling areas other than the cooling area closest to the liquid inlet are each provided with at least one diversion node; and in the first direction and in a direction moving away from the liquid inlet, the number of diversion nodes in the plurality of cooling areas tends to increase.

Description

Heat exchangers, battery packs and electrical equipment

[0001] This disclosure claims priority to Chinese Patent Application No. 202411182029.6, 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 disclosure 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, liquid cooling devices typically include flow channel plates, which are configured with multiple cooling zones, and each cooling zone contains a cooling branch through which fluid flows to cool the battery pack. However, the temperature uniformity of each cooling zone is poor, making it difficult to ensure the thermal balance of each battery pack and reducing the safety of the battery pack. Summary of the Invention

[0005] In view of the above problems, the present disclosure provides a heat exchange device, a battery pack, and an electrical device, which can improve the temperature uniformity of each cooling zone, thereby ensuring the heat balance of each battery group in the battery pack and helping to improve the safety of the battery pack and the electrical device.

[0006] To achieve the above objectives, the present disclosure provides the following technical solutions:

[0007] A first aspect of this disclosure provides a heat exchange device, comprising: a liquid inlet and a plurality of cooling zones, wherein the plurality of cooling zones are arranged sequentially along a first direction and each cooling zone is provided with a flow channel; in the first direction, the liquid inlet is located on one side of the plurality of cooling zones and is respectively connected to the liquid inlet end of each cooling zone;

[0008] In the first direction, except for the cooling zone closest to the liquid inlet, the flow channels of the remaining cooling zones are provided with at least one diversion node; in the first direction and in the direction away from the liquid inlet, the number of diversion nodes in the multiple cooling zones shows an increasing trend.

[0009] In one possible implementation, in the first direction and in a direction away from the liquid inlet, in any two adjacent cooling zones, the number of the diversion nodes in the cooling zone closer to the liquid inlet is less than or equal to the number of the diversion nodes in the cooling zone away from the liquid inlet.

[0010] In one possible implementation, in the first direction and in the direction away from the liquid inlet, the number of the diversion nodes in the remaining cooling zones, except for the cooling zone closest to the liquid inlet, gradually increases.

[0011] In one possible implementation, in the first direction and in the direction away from the liquid inlet, the number of the diversion nodes in the cooling zone closest to the liquid inlet and the cooling zone second closest to the liquid inlet among the plurality of cooling zones are equal;

[0012] The number of the branching nodes in the remaining cooling zones gradually increases.

[0013] In one possible implementation, when the number of the diversion nodes in any two adjacent cooling zones is equal, the flow channel of each cooling zone includes at least two diversion channels.

[0014] The length of the flow distribution channel in the cooling zone near the liquid inlet is less than the length of the flow distribution channel in the cooling zone away from the liquid inlet.

[0015] In one possible implementation, in the first direction, all of the cooling zones except the one closest to the liquid inlet are provided with at least one confluence node; in the first direction, each cooling zone includes a first edge and a second edge disposed opposite to each other, the first edge being located between the liquid inlet and the second edge;

[0016] In the plurality of cooling zones, except for the cooling zone closest to the liquid inlet, in any two adjacent cooling zones, the distance between the confluence node and the first edge in the cooling zone closer to the liquid inlet is the first distance, and the distance between the confluence node and the first edge in the cooling zone farther from the liquid inlet is the second distance.

[0017] The first distance is less than or equal to the second distance.

[0018] In one possible implementation, each of the cooling zones further includes a busbar node;

[0019] In the first direction, a branching node for each cooling zone is disposed at at least one end of the cooling zone;

[0020] At least a portion of the cooling zones have a confluence node located in the middle of the cooling zone.

[0021] In one possible implementation, the inner diameter of the flow channels of the plurality of cooling zones tends to increase in the first direction and in the direction away from the liquid inlet.

[0022] In one possible implementation, the inner diameter of the flow channels of the plurality of cooling zones gradually increases in the first direction and in the direction away from the liquid inlet;

[0023] Alternatively, in the first direction and away from the liquid inlet, in any two adjacent cooling zones, the inner diameter of the flow channel in the cooling zone closer to the liquid inlet is less than or equal to the inner diameter of the flow channel in the cooling zone away from the liquid inlet.

[0024] In one possible implementation, the plurality of cooling zones includes a first cooling zone, which is the cooling zone closest to the liquid inlet; the first cooling zone is provided with a flow splitting node.

[0025] In one possible implementation, the diversion node divides the flow channel of the first cooling zone into a first diversion channel and a second diversion channel;

[0026] The first diversion channel is located on the side of the second diversion channel near the inlet, and the length of the first diversion channel is less than the length of the second diversion channel.

[0027] In one possible implementation, the flow channel of the first cooling zone includes a first constricted section, the inner diameter of which is smaller than the inner diameter of the remaining area of ​​the flow channel of the first cooling zone.

[0028] In one possible implementation, the flow channel of the first cooling zone further includes a converging channel, which is connected to the first branch channel and the second branch channel; the first constriction section is provided in at least one of the first branch channel, the second branch channel and the converging channel.

[0029] In one possible implementation, the plurality of cooling zones further includes a first cooling zone and a second cooling zone arranged along the first direction, wherein the second cooling zone is disposed on the side of the first cooling zone opposite to the liquid inlet.

[0030] The second cooling zone is provided with a flow splitting node, and the flow splitting node is located at the end of the flow channel of the second cooling zone facing the first cooling zone.

[0031] In one possible implementation, the diversion node of the second cooling zone divides the flow channel of the second cooling zone into a third diversion channel and a fourth diversion channel;

[0032] The third diversion channel is located on the side of the fourth diversion channel that is close to the first cooling zone, and the length of the third diversion channel is less than or equal to the length of the fourth diversion channel.

[0033] In one possible implementation, the flow channel of the second cooling zone includes a second constricted section, the inner diameter of which is smaller than the inner diameter of the rest of the flow channel.

[0034] In one possible implementation, the second necking section is disposed in the third diversion channel and / or the fourth diversion channel.

[0035] In one possible implementation, along the first direction and away from the liquid inlet, the plurality of cooling zones further include a first cooling zone, a second cooling zone, and a third cooling zone arranged sequentially.

[0036] The third cooling zone is provided with three flow-diverting nodes; in the first direction, two of the flow-diverting nodes are located on the side of the third cooling zone near the liquid inlet, and the other flow-diverting node is located on the side of the third cooling zone away from the liquid inlet.

[0037] In one possible implementation, the third cooling zone includes a first sub-cooling zone and a second sub-cooling zone, wherein the first sub-cooling zone is located on the side of the second sub-cooling zone closer to the second cooling zone;

[0038] Of the three diversion nodes, two are located on the side of the first sub-cooling zone closer to the liquid inlet, and the other is located on the side of the second sub-cooling zone away from the liquid inlet.

[0039] In one possible implementation, along the first direction and away from the liquid inlet, the plurality of cooling zones further include a first cooling zone, a second cooling zone, a third cooling zone, and a fourth cooling zone arranged sequentially.

[0040] The third cooling zone is provided with six flow-diverting nodes. In the first direction, three of the flow-diverting nodes are located on the side of the fourth cooling zone near the liquid inlet, and the other three flow-diverting nodes are located on the side of the fourth cooling zone away from the liquid inlet.

[0041] In one possible implementation, the fourth cooling zone includes a third sub-cooling zone and a fourth sub-cooling zone;

[0042] Of the six diversion nodes, three are located on the side of the third sub-cooling zone near the liquid inlet, and the other three are located on the side of the fourth sub-cooling zone away from the liquid inlet.

[0043] In one possible implementation, the areas of the first cooling zone, the second cooling zone, the third cooling zone, and the fourth cooling zone gradually increase along the first direction.

[0044] In one possible implementation, the heat exchange device further includes a liquid inlet zone, through which the liquid inlet is connected to each of the cooling zones.

[0045] In one possible implementation, the liquid inlet area includes multiple liquid inlet channels, which are correspondingly connected to multiple cooling zones.

[0046] In one possible implementation, the multiple liquid inlet channels include a first liquid inlet channel, a second liquid inlet channel, and a third liquid inlet channel;

[0047] The liquid inlet is connected to the first cooling zone through the first liquid inlet channel;

[0048] The liquid inlet is connected to the second cooling zone through the second liquid inlet channel;

[0049] The liquid inlet is connected to the third cooling zone through the third liquid inlet channel.

[0050] In one possible implementation, the plurality of liquid inlet channels include a fourth liquid inlet channel, which includes a main liquid inlet path, a first liquid inlet branch path, a second liquid inlet branch path, and a third liquid inlet branch path; the main liquid inlet path is connected to the liquid inlet and extends along a second direction; the first liquid inlet branch path, the second liquid inlet branch path, and the third liquid inlet branch path are respectively connected to the main liquid inlet path and are arranged sequentially in a direction away from the cooling zone;

[0051] The first liquid inlet branch is connected to the third sub-cooling zone; the second liquid inlet branch and the third liquid inlet branch are both connected to the fourth sub-cooling zone.

[0052] In one possible implementation, the liquid inlet area includes a first liquid inlet area and a second liquid inlet area; the first liquid inlet area is located on one side of the plurality of cooling areas in the first direction and is in communication with the liquid inlet.

[0053] The second liquid inlet area is located on the first side of the plurality of cooling areas in the second direction and is connected to the first liquid inlet area; the second direction intersects the first direction.

[0054] In one possible implementation, the main inlet path is located within the first inlet area, and the first inlet branch path, the second inlet branch path, and the third inlet branch path are located within the second inlet area.

[0055] In one possible implementation, the heat exchange device further includes a return port, which is located on the same side of the cooling zone as the inlet port and is connected to the return end of each cooling zone.

[0056] In one possible implementation, in the first direction, the flow channels of the remaining cooling zones, except for the cooling zone closest to the liquid inlet, are provided with at least one confluence node.

[0057] In the first direction and in the direction away from the liquid inlet, in any two adjacent cooling zones, the number of the confluence nodes in the cooling zone closer to the liquid inlet is less than or equal to the number of the confluence nodes in the cooling zone away from the liquid inlet.

[0058] In one possible implementation, the heat exchange device further includes a liquid return zone, which includes a plurality of liquid return channels;

[0059] The return liquid ends of multiple cooling zones are connected to the return liquid port through the corresponding return liquid flow channels.

[0060] In one possible implementation, the plurality of return channels include a first return channel and a second return channel; the first return channel connects the liquid outlet of the first cooling zone and the return port, and the second return channel connects the liquid outlet of the second cooling zone and the return port.

[0061] In one possible implementation, the plurality of return channels further includes a third return channel; the third return channel includes a first return branch, a second return branch, and a first return main channel; the first return branch and the second return branch extend along a first direction and are arranged sequentially along a second direction; the first return main channel extends along the second direction.

[0062] The first sub-cooling zone is connected to the first main return liquid line through the first return liquid branch; the second sub-cooling zone is connected to the first main return liquid line through the second return liquid branch.

[0063] The second direction intersects with the first direction.

[0064] In one possible implementation, the plurality of return liquid channels further includes a fourth return liquid channel, which includes a third return liquid branch, a fourth return liquid branch, a fifth return liquid branch, and a second return liquid main channel;

[0065] The third, fourth, and fifth return liquid branches are arranged sequentially in a direction away from the cooling zone and all extend along the first direction; the second return liquid main extends along the second direction.

[0066] The third return liquid branch connects the third sub-cooling zone and the second return liquid main line, and the fourth and fifth return liquid branches connect the fourth sub-cooling zone and the second return liquid main line.

[0067] In one possible implementation, the return liquid zone includes a first return liquid zone and a second return liquid zone, wherein the first return liquid zone is located on one side of the plurality of cooling zones in the first direction;

[0068] The second return zone is located on the second side of the plurality of cooling zones in the second direction and is connected to the first return zone.

[0069] In one possible implementation, the heat exchange device includes a temperature distribution plate, a flow channel plate, a first connector, and a second connector; the flow channel plate is disposed on the temperature distribution plate, and the cooling zone, the liquid inlet zone, and the liquid return zone are formed on the flow channel plate;

[0070] Both the first connector and the second connector are mounted on the temperature distribution plate and are located on the same side of the cooling zone. The first connector is connected to the liquid inlet and the second connector is connected to the liquid return outlet.

[0071] A second aspect of the present disclosure provides a battery pack, which includes: a plurality of battery packs and the heat exchange device described in the first aspect;

[0072] The battery packs are arranged sequentially along a first direction, and each cooling zone of the heat exchange device corresponds to each battery pack.

[0073] A third aspect of this disclosure provides an electrical device, including an electrical appliance and a battery pack as described in the second aspect; the battery pack is electrically connected to the electrical appliance and is used to provide electrical energy to the electrical appliance.

[0074] The heat exchange device, battery pack, and electrical equipment provided in this disclosure include a liquid inlet and multiple cooling zones. The multiple cooling zones are arranged sequentially along a first direction, and each cooling zone is provided with a flow channel. In the first direction, except for the cooling zone closest to the liquid inlet, the flow channel in each of the remaining cooling zones has at least one diversion node. In the first direction and away from the liquid inlet, the number of diversion nodes at the liquid inlet in each of the multiple cooling zones increases. Thus, the flow channel of the cooling zone other than the cooling zone closest to the liquid inlet can be divided into at least two diversion channels by the diversion nodes, which is equivalent to shortening the length of each diversion channel. This reduces the pressure drop in the cooling zones away from the liquid inlet, making the pressure drop in each cooling zone as consistent as possible, thereby improving the temperature uniformity of each cooling zone and ensuring the heat balance of each battery in the battery pack.

[0075] In addition to the technical problems solved by the embodiments of this disclosure, 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 disclosure, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation. Attached Figure Description

[0076] To more clearly illustrate the technical solutions in the embodiments of this disclosure 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 disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0077] Figure 1 is a schematic diagram of a heat exchange device provided in the related art;

[0078] Figure 2 is an exploded schematic diagram of the heat exchange device provided in an embodiment of this disclosure;

[0079] Figure 3 is a schematic diagram of the flow channel plate provided in an embodiment of this disclosure;

[0080] Figure 4 is a schematic diagram of the first cooling zone provided in an embodiment of this disclosure;

[0081] Figure 5 is a partial schematic diagram of the second cooling zone provided in an embodiment of this disclosure;

[0082] Figure 6 is a partial schematic diagram of the second cooling zone provided in an embodiment of this disclosure;

[0083] Figure 7 is a partial schematic diagram of the third cooling zone provided in an embodiment of this disclosure;

[0084] Figure 8 is a partial schematic diagram of the third cooling zone provided in an embodiment of this disclosure;

[0085] Figure 9 is a partial schematic diagram of the fourth cooling zone provided in an embodiment of this disclosure;

[0086] Figure 10 is a partial schematic diagram of the fourth cooling zone provided in an embodiment of this disclosure;

[0087] Figure 11 is a schematic diagram of the battery pack provided in an embodiment of this disclosure;

[0088] Figure 12 is a schematic diagram of the electrical equipment provided in the embodiments of this disclosure.

[0089] Explanation of reference numerals in the attached diagram: 1: Cooling zone; 2: Main channel; 3: Liquid inlet; 4: Liquid outlet; 100: Heat exchanger; 10: Liquid inlet; 20: Cooling zone; 201: First edge; 202: Second edge; 21: First cooling zone; 22: Second cooling zone; 23: Third cooling zone; 231: First sub-cooling zone; 232: Second sub-cooling zone; 24: Fourth cooling zone; 241: Third sub-cooling zone; 242: Fourth sub-cooling zone; 251: Flow branching node; 252: Flow converging node; 26: Flow channel of the first cooling zone; 261: First flow branching channel; 262: Second flow branching channel; 263: First constriction section; 264: Flow converging channel; 27: Flow channel of the second cooling zone; 271: Third flow branching channel; 272: Fourth flow branching channel; 273: Second constriction section; 28: Flow channel of the third cooling zone; 281: First branch channel; 282: Second branch channel; 283: Fifth branch channel; 284: Sixth branch channel; 285: Seventh branch channel; 286: Eighth branch channel; 29: Flow channel of the fourth cooling zone; 291: Ninth branch channel; 292: Tenth branch channel; 293: Eleventh branch channel; 294: Twelfth branch channel; 295: Thirteenth branch channel; 296: Fourteenth branch channel; 30: Flow channel plate; 40: Heat spreader plate; 50: Liquid inlet area; 51: First liquid inlet channel; 52: Second liquid inlet channel; 53: Third liquid inlet channel; 54: Fourth liquid inlet channel; 541: Main liquid inlet path; 542: First liquid inlet branch; 543: Second liquid inlet branch; 544: Third liquid inlet branch; 60: Liquid return port; 70: Return liquid area; 71: First return liquid flow channel; 72: Second return liquid flow channel; 73: Third return liquid flow channel; 731: First return liquid branch; 732: Second return liquid branch; 733: First return liquid main line; 74: Fourth return liquid flow channel; 741: Third return liquid branch; 742: Fourth return liquid branch; 743: Fifth return liquid branch; 744: Second return liquid main line; 80: First connector; 90: Second connector; 200: Battery pack; 300: Battery module; 400: Electrical equipment; 401: Electrical device. Detailed Implementation

[0090] As described in the background section, the inventors have discovered that the poor temperature uniformity of the cooling zones in the flow channel plates of the related art is due to the uneven distribution of the cooling zones. For example, referring to Figure 1, the flow channel plate typically includes four cooling zones 1 and a main channel 2 extending along its length. Two cooling zones 1 are located on one side of the main channel 2, and the other two are located on the other side. The flow channel plate also includes an inlet port 3 and an outlet port 4. The inlet port 3 is connected to the inlet end of each cooling zone via the main channel, and the outlet port 4 is connected to the outlet end of each cooling zone via a return channel. However, the inlet port 3 and outlet port 4 are typically located on one side of the main channel 2, resulting in different flow channel lengths for the cooling zones located on either side of the main channel 2, thus causing uneven temperature distribution in the cooling zones 1.

[0091] To address the aforementioned technical problems, this disclosure provides a heat exchange device, a battery pack, and electrical equipment. The heat exchange device includes a liquid inlet and multiple cooling zones arranged sequentially along a first direction. Each cooling zone is provided with a flow channel. In the first direction, except for the cooling zone closest to the liquid inlet, the flow channel in the remaining cooling zones is provided with at least one diversion node. In the first direction and away from the liquid inlet, the number of diversion nodes at the liquid inlet in the multiple cooling zones increases. Thus, the flow channel of the cooling zone other than the cooling zone closest to the liquid inlet can be divided into at least two diversion channels by the diversion nodes, effectively shortening the length of each diversion channel. This reduces the pressure drop in the cooling zones away from the liquid inlet, making the pressure drop in each cooling zone as uniform as possible, thereby improving the temperature uniformity of each cooling zone and ensuring the heat balance of each battery in the battery pack.

[0092] To make the above-mentioned objects, features, and advantages of the embodiments of this disclosure more apparent and understandable, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0093] Please refer to Figure 2. This embodiment of the present disclosure provides a heat exchange device 100, which can be used to cool a component to be processed, thereby reducing the temperature of the component. The component to be processed may include, but is not limited to, a battery pack. It should be understood that the following description uses the heat exchange device 100 to exchange heat with a battery pack as an example.

[0094] Referring to Figures 2 and 3, the heat exchange device 100 may include an inlet 10 and multiple cooling zones 20, wherein the cooling zones 20 may be formed on the flow channel plate 30; for example, the cooling zones 20 may be formed on the flow channel plate 30 by a stamping process. It should be noted that the heat exchange device 100 in this embodiment also includes a heat spreader 40, which is disposed on the side of the flow channel plate 30 away from the cooling zones. The heat spreader 40 supports the flow channel plate 30 and covers the cooling zones 20 to ensure the airtightness of the heat exchange device 100. Furthermore, the heat spreader 40 facilitates the installation and fixing of the heat exchange device 100 to the component to be cooled.

[0095] The shape of the flow channel plate 30 can be regular or irregular. The following embodiments are all described with the flow channel plate 30 as a rectangle.

[0096] Please refer to Figure 3. Multiple cooling zones 20 are arranged sequentially along a first direction. The first direction can be the length direction of the flow channel plate 30, i.e., the X direction in Figure 3. The second direction can be the width direction of the flow channel plate 30, i.e., the Y direction in Figure 3. It should be noted that the multiple cooling zones 20 can also be connected in parallel, allowing for relatively independent configuration and control of each zone.

[0097] In the first direction, the liquid inlet 10 is located on one side of the plurality of cooling zones 20. Taking the orientation shown in Figure 3 as an example, the liquid inlet 10 can be located on the left or right side of the plurality of cooling zones 20. The liquid inlet 10 is connected to the liquid inlet end of each cooling zone 20, so that the fluid flows in each cooling zone 20 and exchanges heat with each battery pack 200. It should be noted that, in this embodiment, heat exchange can be understood as the heat exchange device 100 being able to cool down the battery pack 200 or heat the battery pack 200. Specifically, the type of fluid flowing in the cooling zone 20 can be freely selected according to the environment in which the battery pack 200 is located. For example, when the heat exchange device 100 is used to cool down the battery pack 200, the fluid may include refrigerant, CO2, ethylene glycol, or water.

[0098] Each cooling zone 20 is provided with a flow channel; the flow channel is used for fluid circulation, thereby exchanging heat with the battery pack 200, so that the battery pack 200 is within a suitable temperature range. In the first direction and away from the liquid inlet 10, except for the cooling zone 20 closest to the liquid inlet 10, the flow channel of the other cooling zones 20 is provided with at least one diversion node 251.

[0099] It should be noted that, in this embodiment, the cooling zone 20 closest to the liquid inlet 10 among the multiple cooling zones 20 may or may not have a flow branch node 251. In this embodiment, the cooling zone 20 closest to the liquid inlet 10 can be understood as the cooling zone 20 closest to the liquid inlet 10, i.e., the first cooling zone 20 in Figure 3. In this embodiment, the function of the flow branch node 251 is to divide the flow channel into different flow branches; therefore, the area connecting two flow branches is called the flow branch node 251.

[0100] In this embodiment, the number of cooling zones 20 can be selected in various ways. For example, the number of cooling zones 20 can be two, three, four, or even more. For example, taking the structure shown in Figure 3 as an example, the number of cooling zones 20 is four. That is, the multiple cooling zones 20 include a first cooling zone 21, a second cooling zone 22, a third cooling zone 23, and a fourth cooling zone 24. The first cooling zone 21 is the cooling zone 20 closest to the liquid inlet 10. At the same time, apart from the cooling zone 20 closest to the liquid inlet 10, the remaining cooling zones 20 are the second cooling zone 22, the third cooling zone 23, and the fourth cooling zone 24.

[0101] If the first cooling zone 21, the second cooling zone 22, the third cooling zone 23, and the fourth cooling zone 24 maintain the same pressure drop, the following defects will occur: the first cooling zone 21 is closest to the liquid inlet 10, therefore, the temperature of the fluid in the first cooling zone 21 is lower; if the pressure drop of the first cooling zone 21 is the same as the pressure drop of the other cooling zones 20, under the premise of the same heat exchange time, the heat exchange cooling capacity of the first cooling zone 21 will be higher than that of the other cooling zones 20, resulting in an imbalance in the cooling capacity of each cooling zone 20. Based on this, this embodiment requires that, except for the cooling zone 20 closest to the liquid inlet 10, the flow channels of the other cooling zones 20 be provided with at least one diversion node 251.

[0102] Based on this, in this embodiment, the flow channel of the cooling zone 20 far from the liquid inlet 10 can be divided by the flow node 251, so that the flow channel includes at least two flow channels, which is equivalent to shortening the length of each flow channel, thereby reducing the pressure drop of the cooling zone far from the liquid inlet, making the pressure drop of each cooling zone as consistent as possible, thereby improving the temperature uniformity of each cooling zone and ensuring the heat balance of each battery pack 200 in the battery pack.

[0103] Furthermore, in the first direction and in the direction away from the inlet 10, the number of diversion nodes 251 in the multiple cooling zones 20 tends to increase. In this embodiment, by setting fewer diversion nodes 251 in the cooling zones 20 near the inlet 10 and more diversion nodes 251 in the cooling zones 20 away from the inlet 10, it is possible to ensure that the fluid maintains a higher pressure drop in the cooling zones 20 near the inlet 10, thereby ensuring that the fluid can quickly reach the cooling zones 20 further away, and shortening the heat exchange time of the fluid in each cooling zone 20 near the inlet 10. This avoids excessive consumption of cooling capacity when the fluid passes through the cooling zones 20 near the inlet 10, thereby preventing insufficient heat exchange capacity in the cooling zones 20 away from the inlet 10, and thus improving the uniformity of the cooling performance of each cooling zone 20.

[0104] In addition, by rationally allocating the number of flow branch nodes 251 in each cooling zone 20, the flow resistance of the fluid in the heat exchange device 100 can be effectively reduced, thereby improving the cooling efficiency of the entire heat exchange device 100.

[0105] In one possible implementation, in any two adjacent cooling zones 20 in a first direction and away from the inlet 10, the number of diversion nodes 251 in the cooling zone 20 closer to the inlet 10 is less than or equal to the number of diversion nodes 251 in the cooling zone 20 away from the inlet 10. For example, the number of diversion nodes 251 in the first cooling zone 21 is less than or equal to the number of diversion nodes 251 in the second cooling zone 22; the number of diversion nodes 251 in the second cooling zone 22 is less than or equal to the number of diversion nodes 251 in the third cooling zone 23; and the number of diversion nodes 251 in the third cooling zone 23 is less than or equal to the number of diversion nodes 251 in the fourth cooling zone 24.

[0106] In this way, the voltage drop of adjacent cooling zones 20 is balanced as much as possible, thereby improving the temperature uniformity of each cooling zone and ensuring the heat balance of each battery pack 200 in the battery pack.

[0107] In one possible implementation, in the first direction and away from the inlet 10, the number of flow-diverting nodes 251 in the multiple cooling zones 20, except for the closest cooling zone 20, gradually increases. This ensures that the fluid is gradually dispersed in the remaining cooling zones 20, preventing excessive concentration or thinning of the fluid in any one cooling zone, thus resulting in a more uniform cooling effect for the heat exchanger 100. Furthermore, gradually increasing the number of flow-diverting nodes in the remaining cooling zones 20 helps optimize the fluid flow path and velocity, reducing fluid flow resistance and turbulence, thereby improving the overall efficiency of the heat exchanger 100.

[0108] It should be noted that the layout of the flow-diverting nodes 251 in the cooling zone 20 closest to the liquid inlet 10 and the cooling zone 20 next to the liquid inlet 10 can have several options. For example, no flow-diverting nodes 251 may be provided in the cooling zone 20 closest to the liquid inlet 10. Alternatively, flow-diverting nodes 251 may be provided in the cooling zone 20 closest to the liquid inlet 10. When flow-diverting nodes 251 are provided in the cooling zone 20 closest to the liquid inlet 10, the number of flow-diverting nodes 251 in the cooling zone 20 closest to the liquid inlet 10 can be less than or equal to the number of flow-diverting nodes 251 in the cooling zone 20 next to the liquid inlet 10. The cooling zone 20 closest to the liquid inlet 10 can be understood as the first cooling zone 20 in the first direction. For example, the cooling zone 20 closest to the liquid inlet 10 is the first cooling zone 21. The cooling zone 20 next to the liquid inlet 10 can be understood as the second cooling zone 20 in the first direction. For example, the cooling zone 20 next to the liquid inlet 10 is the second cooling zone 22.

[0109] Preferably, in the first direction and in the direction away from the liquid inlet 10, the number of diversion nodes 251 in the cooling zone 20 closest to the liquid inlet 10 and the cooling zone 20 second closest to the liquid inlet 10 are equal; the number of diversion nodes 251 in the remaining cooling zones 20 gradually increases.

[0110] In this embodiment, by setting a flow-diverting node 251 in the cooling zone 20 closest to the liquid inlet 10, excessive pressure drop and flow velocity of the fluid in the cooling zone 20 closest to the liquid inlet 10 can be prevented, thus avoiding overheating in the cooling zone 20 closest to the liquid inlet 10. Furthermore, in conjunction with a technical solution that gradually increases the number of flow-diverting nodes 251 in the remaining cooling zones 20, it can be ensured that the fluid can be more fully dispersed and flow in the cooling zones 20 farther from the liquid inlet 10. This progressively increasing design can optimize the heat exchange efficiency of the heat exchange device 100, ensuring a more uniform and efficient cooling effect throughout the entire heat exchange device 100.

[0111] In one possible implementation, when the number of branch nodes 251 in any two adjacent cooling zones 20 is equal, the flow channel of each cooling zone 20 includes at least two branch channels; that is, each cooling zone 20 includes at least one branch node.

[0112] The length of the flow channel in the cooling zone 20 near the liquid inlet 10 is less than the length of the flow channel in the cooling zone 20 away from the liquid inlet 10.

[0113] The following description uses the example of a flow-diverting node 251 being provided in one of the two cooling zones 20 closest to and second closest to the liquid inlet 10. For example, the plurality of cooling zones 20 includes a first cooling zone 21, which is the cooling zone closest to the liquid inlet 10, and a flow-diverting node 251 is provided in the first cooling zone 21. The flow-diverting node 251 is located on the side of the flow channel away from the liquid inlet 10.

[0114] Please refer to Figure 4. The diversion node 251 divides the flow channel 26 of the first cooling zone into a first diversion channel 261 and a second diversion channel 262. The first diversion channel 261 and the second diversion channel 262 converge at the ends away from the diversion node 251 to form a converging channel 264.

[0115] Please refer to Figures 5 and 6. The multiple cooling zones 20 also include a second cooling zone 22, which is the cooling zone closest to the liquid inlet 10. A flow divider 251 is provided in the second cooling zone 22. The flow divider 251 is located in the middle of the second cooling zone 22 to divide the flow channel of the second cooling zone into a third flow divider 271 and a fourth flow divider 272.

[0116] In this embodiment, the lengths along the flow path of the first diversion channel 261 and the second diversion channel 262 are shorter than the lengths along the flow path of the third diversion channel 271 and the fourth diversion channel 272. This ensures that the confluence channel 264 in the first cooling zone 21 still has a relatively long flow path. Compared to a single flow path and the second cooling zone 22, this not only reduces the length of a single flow path, avoiding excessive pressure drop in the first cooling zone 21, but also balances the cooling capacity of the first cooling zone 21 and the second cooling zone 22.

[0117] It should be noted that when the cooling zone 20 contains a branch node 251, a convergence node 252 will also be set in the cooling zone 20 accordingly.

[0118] For example, in the first direction, all cooling zones 20 except the one closest to the liquid inlet 10 are provided with at least one confluence node 252. It should be understood that when the cooling zone 20 closest to the liquid inlet 10 is provided with a diversion node 251, the cooling zone 20 closest to the liquid inlet 10 is also provided with a confluence node 252.

[0119] Please continue referring to Figures 4 to 10. Each cooling zone 20 includes a first edge 201 and a second edge 202 disposed opposite to each other. The first edge 201 is located between the liquid inlet 10 and the second edge 202, that is, the first edge 201 is adjacent to the liquid inlet 10. Taking the orientation shown in Figure 4 as an example, the first edge 201 is the left edge of the first cooling zone 21, and the second edge 202 is the right edge of the first cooling zone 21.

[0120] In the multiple cooling zones 20, except for the cooling zone 20 closest to the liquid inlet 10, in any two adjacent cooling zones 20, the distance between the confluence node 252 and the first edge 201 in the cooling zone 20 closest to the liquid inlet 10 is the first distance, and the distance between the confluence node 252 and the first edge 201 in the cooling zone farther from the liquid inlet 10 is the second distance; the first distance is less than or equal to the second distance. This arrangement allows for a reasonable distribution of fluid flow velocity and flow rate within each cooling zone, avoiding overcooling or overheating in certain cooling zones, thereby achieving a more uniform temperature distribution and improving the heat exchange efficiency of the heat exchange device.

[0121] In one possible implementation, each cooling zone 20 further includes a confluence node 252; in a first direction, a branch node of each cooling zone 20 is disposed at at least one end of the cooling zone 20; and the confluence node 252 of at least a portion of the cooling zones 20 is disposed in the middle of the cooling zone 20.

[0122] It should be noted that in this embodiment, the end can be understood as the cooling zone 20 having an end facing the liquid inlet 10 and an end away from the liquid inlet 10 in the first direction. Taking the orientation shown in Figure 4 as an example, one end corresponds to the first edge 201, and the other end corresponds to the second edge 202.

[0123] In this embodiment, a cooling zone 20 typically exchanges heat with a battery pack 200. Different areas of the battery pack 200 generate varying amounts of heat. For example, the battery pack 200 includes a first heating zone and a second heating zone. The heat generated by the first heating zone is greater than that of the second heating zone. The first heating zone is located at least on one side of the second heating zone. It should be noted that in this embodiment, the first heating zone can be the area opposite the terminals of the battery pack, and this area generates a larger amount of heat, typically located at both ends of the battery pack in the first direction. The second heating zone can be the other areas of the battery pack excluding the areas opposite the terminals, and this area generates a smaller amount of heat, typically located in the middle of the battery pack.

[0124] Therefore, in this embodiment, the diversion node 251 is located at at least one end of the cooling zone 20 in the first direction, and the confluence node 252 is located in the middle of the cooling zone 20. This allows the fluid to enter the cooling zone 20 from the end in the first direction and then flow back from the middle of the cooling zone 20. When the heat exchange device is used to cool the battery, it ensures that the fluid first flows through the end of the battery with higher heat generation and exchanges heat before flowing out from the middle of the battery with lower heat generation, thus improving the cooling effect on the battery. In addition, it can also avoid the superposition effect of local overheating caused by the heat exchange device and the high heat generation area of ​​the battery.

[0125] It should be noted that, in order to balance the pressure drop of each cooling zone 20, in addition to adjusting the number and location of the branch nodes 251 and the converging nodes 252 of each cooling zone 20, other features can also be used to limit it.

[0126] Exemplarily, in the first direction and away from the liquid inlet 10, the inner diameter of the flow channels of the plurality of cooling zones 20 tends to increase. In one example, in the first direction and away from the liquid inlet 10, the inner diameter of the flow channels of the plurality of cooling zones 20 gradually increases. In another example, in the first direction and away from the liquid inlet, in any two adjacent cooling zones 20, the inner diameter of the flow channel in the cooling zone 20 closer to the liquid inlet 10 is less than or equal to the inner diameter of the flow channel in the cooling zone 20 away from the liquid inlet 10.

[0127] Given that the inner diameter of the flow channel is inversely proportional to the pressure drop, a smaller inner diameter results in a smaller cross-sectional area for fluid flow, higher flow velocity, greater frictional loss, and a greater pressure drop. Meanwhile, the flow path further away from the inlet 10 already has a relatively large travel distance. Therefore, in order to minimize the pressure drop in the cooling zones 20 further away from the inlet 10, in this example, the inner diameter of the flow channels in the multiple cooling zones 20 tends to increase. This helps to balance the pressure drop in each cooling zone 20 as much as possible, making the pressure drop area consistent across all cooling zones 20.

[0128] To facilitate a detailed description of each cooling zone 20, let's take four cooling zones as an example. For instance, the multiple cooling zones 20 include a first cooling zone 21, a second cooling zone 22, a third cooling zone 23, and a fourth cooling zone 24 arranged sequentially along a first direction. The inner diameter of the flow channel 29 in the fourth cooling zone is larger than the inner diameter of the flow channel 28 in the third cooling zone; the inner diameter of the flow channel 28 in the third cooling zone is larger than the inner diameter of the flow channel 26 in the first cooling zone; and the inner diameter of the flow channel 26 in the first cooling zone is larger than the inner diameter of the flow channel 27 in the second cooling zone. Since the inner diameter of the flow channel is inversely proportional to the pressure drop, a smaller inner diameter results in a smaller cross-sectional area for fluid flow, a higher flow velocity, greater frictional loss, and a greater pressure drop. Therefore, to minimize the pressure drop in the fourth cooling zone, the inner diameter of the flow channel 29 in the fourth cooling zone can be set to be the largest possible value, greater than the inner diameter of the flow channel 28 in the third cooling zone.

[0129] It should be understood that, given that the first cooling zone adopts a design concept of no flow splitting or the flow splitting node being far away from the liquid inlet, the first cooling zone 21 already has a sufficiently large pressure drop. If the inner diameter of the flow channel 26 in the first cooling zone is too small, it will excessively reduce the pressure drop of the first cooling zone 21. Therefore, in this embodiment, the inner diameter of the flow channel 26 in the first cooling zone is larger than the inner diameter of the flow channel 27 in the second cooling zone, which can adjust the pressure drop of the first cooling zone 21 and ensure the cooling capacity of each cooling zone 20 is as balanced as possible.

[0130] The following embodiments all take multiple cooling zones 20, including a first cooling zone 21, a second cooling zone 22, a third cooling zone 23 and a fourth cooling zone 24 arranged sequentially along a first direction, as examples, and describe in detail the number of flow distribution nodes and the layout of flow channels in each cooling zone 20.

[0131] In one possible implementation, the first cooling zone 21 is the cooling zone closest to the liquid inlet 10; the first cooling zone 21 is provided with a flow splitting node 251. If the flow channel in the first cooling zone 21 is arranged in a single-pipe configuration, the flow channel will be too long, resulting in excessive pressure drop and flow velocity within the flow channel. This would cause the heat exchange time between the first cooling zone 21 and the battery to be too short, making it difficult to achieve the desired cooling effect. Therefore, in this embodiment, a flow splitting node 251 is provided in the first cooling zone 21, so that the fluid is divided into two flow splitting channels within the first cooling zone 21, thereby relatively reducing the length of a single flow path and avoiding the defect of excessively increasing the pressure drop in the first cooling zone 21.

[0132] To further regulate the cooling effect of the first cooling zone 21, please refer to Figure 4. The diversion node 251 is located on the side of the flow channel away from the inlet 10, dividing the flow channel 26 of the first cooling zone into a first diversion channel 261 and a second diversion channel 262. The first diversion channel 261 is located on the side of the second diversion channel 262 closer to the inlet 10, and the length of the first diversion channel 261 is less than the length of the second diversion channel 262. Furthermore, in other embodiments, the length of the first diversion channel 261 can also be equal to the length of the second diversion channel 262. It should be noted that in this embodiment, "length" can be understood as the distance of the fluid flow path.

[0133] In this embodiment, while ensuring that the flow channel 26 of the first cooling zone has a sufficiently high pressure drop, the pressure drop of the first cooling zone 21 is finely adjusted through the second diversion channel 262, so that the flow rate in the second diversion channel 262 is slightly increased, thereby reducing the temperature difference between the first cooling zone 21 and other cooling zones 20.

[0134] Furthermore, when the heat exchange device 100 is used to cool the battery pack, the width direction of the battery pack is usually parallel to the first direction, and the length direction of the battery pack is usually perpendicular to the first direction. Therefore, the size of the first cooling zone 21 in the first direction needs to match the width of the battery pack. In this embodiment, by dividing the flow channel 26 of the first cooling zone into a first branch channel 261 and a second branch channel 262, and making fine adjustments using the second branch channel 262 with a shorter path, it is not only convenient to lay out the flow channel 26 of the first cooling zone, but also to ensure that the flow channel 26 of the first cooling zone covers the width of the battery pack as much as possible, thus ensuring the temperature uniformity of each area of ​​the battery pack and improving the safety of the battery pack.

[0135] The inner diameter of the flow channel 26 in the first cooling zone can be the same or different everywhere. For example, the flow channel 26 in the first cooling zone includes a first constricted section 263, wherein the first constricted section 263 can be the area within the dashed box in Figure 4.

[0136] The inner diameter of the first constricted section 263 is smaller than the inner diameter of the remaining area of ​​the flow channel 26 in the first cooling zone. The pressure drop of the flow channel 26 in the first cooling zone is also related to the inner diameter. For example, the pressure drop of the flow channel 26 in the first cooling zone is inversely proportional to the inner diameter; the smaller the inner diameter of the flow channel 26 in the first cooling zone, the greater the pressure drop.

[0137] This embodiment helps to form a local high flow velocity region by partially reducing the inner diameter of the flow channel 26 in the first cooling zone, so that the flow channel 26 in the first cooling zone is in a state of high pressure drop, which makes it easier to adjust the cooling effect of the first cooling zone 21.

[0138] It should be noted that the location and path of the first constriction section 263 can be reasonably set according to the cooling effect requirements of the heat exchange device. For example, the flow channel 26 of the first cooling zone also includes a converging channel 264, which is connected to the first branch channel 261 and the second branch channel 262; or, the first branch channel 261 and the second branch channel 262 converge at the converging node 252 to form the converging channel 264.

[0139] The first constriction section 263 is provided in at least one of the first diversion channel 261, the second diversion channel 262, and the confluence channel 264. In one example, the first constriction section 263 is provided in one of the first diversion channel 261, the second diversion channel 262, and the confluence channel 264; in another example, the first constriction section 263 is provided in at least two of the first diversion channel 261, the second diversion channel 262, and the confluence channel 264. Thus, while ensuring the formation of a local high-velocity region in the flow channel 26 of the first cooling zone, greater design flexibility is provided for the first constriction section 263, ensuring that the first cooling zone 21 maintains a stable cooling effect under different operating conditions, thereby improving the reliability and stability of the heat exchange device.

[0140] Please refer to Figures 3, 5 and 6. The multiple cooling zones also include a second cooling zone 22, which is located on the side of the first cooling zone 21 away from the liquid inlet 10. Taking the orientation shown in Figure 3 as an example, the second cooling zone 22 is located on the right side of the first cooling zone 21, that is, the distance between the second cooling zone 22 and the liquid inlet 10 is greater than the distance between the first cooling zone 21 and the liquid inlet 10.

[0141] The second cooling zone 22 is provided with a flow splitting node 251, which divides the fluid into two flow paths within the second cooling zone 22. Compared with the flow channel 27 of the second cooling zone being a whole pipeline, the length of a single flow path can be relatively reduced, thereby reducing the pressure drop in the second cooling zone 22, which in turn reduces the flow velocity of the fluid in the second cooling zone 22, increases the residence time of the fluid in the second cooling zone 22, and balances the temperature difference between the second cooling zone 22 and the first cooling zone 21.

[0142] In this embodiment, the flow splitting node 251 is located at the end of the flow channel 27 in the second cooling zone facing the first cooling zone 21. This allows the fluid to be split in the second cooling zone 22 as early as possible, which is beneficial for the fluid to be distributed more evenly in the second cooling zone 22 as early as possible, avoiding the defect of local overheating. In addition, the earlier the fluid is split in the second cooling zone 22, the better it is to regulate the pressure drop in the second cooling zone 22, reduce the pressure drop in the second cooling zone 22, prolong the flow time of the fluid in the second cooling zone 22, and balance the temperature difference between the second cooling zone 22 and the first cooling zone 21.

[0143] If so, the heat exchange device is used to cool the battery pack. The length direction of the battery pack is usually perpendicular to the first direction, and the high-heat area of ​​the battery pack is usually located at the end of the length direction. In this embodiment, by setting the diversion node 251 at the end of the flow channel 27 of the second cooling zone toward the first cooling zone 21, the fluid can pass through the high-heat area of ​​the battery pack first and cool down the high-heat area, which can improve the cooling effect of the second cooling zone 22 on the battery pack.

[0144] Please refer to Figures 3, 5, and 6. The flow branching node 251 of the second cooling zone 22 divides the flow channel 27 of the second cooling zone into a third flow branching channel 271 and a fourth flow branching channel 272. The third flow branching channel 271 is located on the side of the fourth flow branching channel 272 closest to the first cooling zone 21; the length of the third flow branching channel 271 is less than or equal to the length of the fourth flow branching channel 272. Thus, the length of the fourth flow branching channel 272 is approximately equal to that of the third flow branching channel 271, ensuring that the flow resistance of the fluid in the two channels is similar, thereby reducing the overall pressure drop of the second cooling zone 22 and improving the cooling efficiency of the heat exchanger.

[0145] The inner diameter of the flow channel 27 in the second cooling zone can be the same or different everywhere. For example, the flow channel 27 in the second cooling zone includes a second constriction section 273, wherein the second constriction section 273 can be the area within the dashed box in Figures 5 and 6.

[0146] The inner diameter of the second constricted section 273 is smaller than the inner diameter of the remaining area of ​​the flow passage 27 in the second cooling zone. The pressure drop of the flow passage 27 in the second cooling zone is also related to the inner diameter. For example, the pressure drop of the flow passage 27 in the second cooling zone is inversely proportional to the inner diameter; the smaller the inner diameter of the flow passage 27 in the second cooling zone, the greater the pressure drop.

[0147] When the pressure drop of the second cooling zone 22 is too small, the cooling effect of the second cooling zone 22 will increase. Therefore, in this embodiment, by locally reducing the inner diameter of the flow channel 27 of the second cooling zone, it is possible to form a local high flow velocity region, so that the local pressure drop of the flow channel 27 of the second cooling zone will increase, which makes it easier to adjust the cooling effect of the second cooling zone 22.

[0148] It should be noted that the location and path of the second constriction section 273 can be reasonably set according to the cooling effect requirements of the heat exchanger. For example, the second constriction section 273 can be set in the third branch channel 271 and / or the fourth branch channel 272. In one example, the second constriction section 273 is set in the third branch channel 271; in another example, the second constriction section 273 is set in the fourth branch channel 272; in yet another example, the second constriction section 273 is set in both the third branch channel 271 and the fourth branch channel 272. In this way, while ensuring the formation of a local high flow velocity region in the flow channel 27 of the second cooling zone, greater design flexibility can be provided for the setting of the second constriction section 273, ensuring that the second cooling zone 22 maintains a stable cooling effect under different operating conditions, thereby improving the reliability and stability of the heat exchanger.

[0149] Please refer to Figures 3, 7, and 8. The plurality of cooling zones 20 also includes a third cooling zone 23, which is located on the side of the second cooling zone 22 opposite to the first cooling zone 21. Alternatively, along the first direction and away from the liquid inlet 10, the plurality of cooling zones 20 also includes a first cooling zone 21, a second cooling zone 22, and a third cooling zone 23 arranged sequentially. The third cooling zone 23 has three flow-diverting nodes 251. In the first direction, two of the flow-diverting nodes 251 are located on the side of the third cooling zone 23 closest to the liquid inlet 10, and the other flow-diverting node 251 is located on the side of the third cooling zone 23 away from the liquid inlet 10.

[0150] In this embodiment, by setting three flow-diverting nodes 251 within the third cooling zone 23, the flow channel 28 of the third cooling zone can be divided into four flow-diverting channels. This arrangement minimizes the length of the four flow-diverting channels, thereby reducing the pressure drop in the third cooling zone 23 and improving its cooling capacity. Furthermore, in the first direction, two of the flow-diverting nodes 251 are located on the side of the third cooling zone 23 closest to the liquid inlet 10, and the other flow-diverting node 251 is located on the side of the third cooling zone 23 away from the liquid inlet 10. This allows two flow-diverting nodes 251 and the other flow-diverting node 251 to be located at opposite ends of the third cooling zone 23 in the first direction, enabling rapid cooling of the high-heat areas of the battery pack and improving the safety of the battery pack.

[0151] To facilitate a detailed description of the location of the three distribution nodes, the third cooling zone 23 can be further refined. Please refer to Figures 7 and 8. For example, the third cooling zone 23 includes a first sub-cooling zone 231 and a second sub-cooling zone 232. The first sub-cooling zone 231 is located on the side of the second sub-cooling zone 232 that is closer to the second cooling zone 22. That is, the first sub-cooling zone 231 is located on the side of the second cooling zone 22 and the second sub-cooling zone 232.

[0152] Of the three flow branching nodes 251, two are located on the side of the first sub-cooling zone 231 near the liquid inlet 10, and the other is located on the side of the second sub-cooling zone 232 away from the liquid inlet 10. To further illustrate the relationship between the three flow branching nodes 251 and the flow channel in the third cooling zone 23, the three flow branching nodes 251 can be referred to as the first flow branching node, the second flow branching node, and the third flow branching node.

[0153] The first and second diversion nodes are located within the first sub-cooling zone 231. The first diversion node divides the flow channel 28 of the third cooling zone into a first diversion branch 281 and a second diversion branch 282. Part of the fluid flows to the first sub-cooling zone 231 through the first diversion branch 281, and part of the fluid flows to the second sub-cooling zone 232 through the second diversion branch 282.

[0154] Please refer to Figure 7. The second diversion node is located within the first sub-cooling zone 231 and on the first diversion branch 281 to divide the flow channel in the first sub-cooling zone into the fifth diversion channel 283 and the sixth diversion channel 284.

[0155] Please refer to Figure 8. The third diversion node is located in the second sub-cooling zone 232 and on the second diversion branch 282 to divide the flow channel in the second sub-cooling zone into the seventh diversion channel 285 and the eighth diversion channel 286.

[0156] With this configuration, this embodiment divides the flow channel 28 of the third cooling zone 23 into a fifth branch channel 283, a sixth branch channel 284, a seventh branch channel 285, and an eighth branch channel 286 by setting three branch nodes 251 within the third cooling zone 23. This configuration minimizes the length of each branch channel in the third cooling zone, thereby reducing the pressure drop in the third cooling zone 23 and improving its cooling capacity. Furthermore, the first sub-cooling zone 231 and the second sub-cooling zone 232 are symmetrically arranged with respect to the second direction, which simplifies the manufacturing process of the heat exchange device 100 and reduces production costs.

[0157] Please refer to Figures 3, 9, and 10. The multiple cooling zones 20 also include a fourth cooling zone 24, which is located on the side of the third cooling zone 23 away from the first cooling zone 21. The third cooling zone has six flow distribution nodes 251. Three flow distribution nodes 251 are located on the side of the fourth cooling zone 24 near the liquid inlet 10, and the other three flow distribution nodes 251 are located on the side of the fourth cooling zone 24 away from the liquid inlet 10.

[0158] In this embodiment, by setting six flow-diverting nodes 251 within the fourth cooling zone 24, the flow channel 29 of the fourth cooling zone can be divided into six flow-diverting channels. Compared with the third cooling zone 23, the flow channel 29 of the fourth cooling zone is divided into more flow-diverting channels. This arrangement can shorten the length of the six flow-diverting channels as much as possible, thereby minimizing the pressure drop in the fourth cooling zone 24 and improving its cooling capacity. This balances the cooling capacity of the first cooling zone 21, the second cooling zone 22, the third cooling zone 23, and the fourth cooling zone 24.

[0159] Furthermore, in the first direction, three of the shunt nodes 251 are located on the side of the fourth cooling zone 24 near the liquid inlet 10, and the other three shunt nodes 251 are located on the side of the fourth cooling zone 24 away from the liquid inlet 10. In this way, three of the shunt nodes 251 and the other three shunt nodes 251 are located at both ends of the fourth cooling zone 24 in the first direction, which can quickly cool the high-heat area of ​​the battery and improve the safety of the battery pack.

[0160] Please refer to Figures 3, 9, and 10. The fourth cooling zone 24 includes a third sub-cooling zone 241 and a fourth sub-cooling zone 242. Among the six flow-diverting nodes, three flow-diverting nodes are located on the side of the third sub-cooling zone 241 near the liquid inlet 10, to divide the flow channel in the third sub-cooling zone 241 into a ninth flow-diverting channel 291, a tenth flow-diverting channel 292, and an eleventh flow-diverting channel 293. The other three flow-diverting nodes are located on the side of the fourth sub-cooling zone 242 away from the liquid inlet 10, to divide the flow channel in the fourth sub-cooling zone into a twelfth flow-diverting channel 294, a thirteenth flow-diverting channel 295, and a fourteenth flow-diverting channel 296. With this arrangement, the number of flow channels in the third sub-cooling zone 241 and the fourth sub-cooling zone 242 is the same, which can ensure the balance of cooling capacity between the third sub-cooling zone 241 and the fourth sub-cooling zone 242.

[0161] Please continue referring to Figure 3. In the first direction, the areas of the first cooling zone 21, the second cooling zone 22, the third cooling zone 23, and the fourth cooling zone 24 gradually increase. As the distance between the second cooling zone 22, the third cooling zone 23, and the fourth cooling zone 24 and the liquid inlet 10 increases, the cooling capacity of the second cooling zone 22, the third cooling zone 23, and the fourth cooling zone 24 relatively weakens. Therefore, in this embodiment, by gradually increasing the area of ​​the second cooling zone 22, the third cooling zone 23, and the fourth cooling zone 24, the heat exchange time between the fluid and the battery in the second cooling zone 22, the third cooling zone 23, and the fourth cooling zone 24 can be extended, thereby gradually improving the cooling effect of the heat exchange device 100.

[0162] In one possible implementation, referring to Figure 3, the heat exchange device 100 of this embodiment further includes a liquid inlet zone 50, through which the liquid inlet 10 is connected to each cooling zone 20. The liquid inlet zone 50 serves two purposes: firstly, it ensures uniform distribution of fluid before it enters each cooling zone 20, guaranteeing sufficient flow to each cooling zone and thus improving the cooling efficiency of the heat exchange device; secondly, it optimizes the fluid flow path, reduces flow resistance, and enhances the hydrodynamic performance of the heat exchange device 100.

[0163] In one possible implementation, the liquid inlet zone 50 includes multiple liquid inlet channels, which are correspondingly connected to multiple cooling zones 20. That is, the number of cooling zones 20 is equal to the number of liquid inlet channels, and one of the cooling zones 20 is connected to the liquid inlet 10 through at least one liquid inlet channel.

[0164] For example, referring to Figures 3 to 10, the plurality of liquid inlet channels include a first liquid inlet channel 51, a second liquid inlet channel 52, and a third liquid inlet channel 53. The liquid inlet 10 is connected to the first cooling zone 21 via the first liquid inlet channel 51; the liquid inlet 10 is connected to the second cooling zone 22 via the second liquid inlet channel 52; and the liquid inlet 10 is connected to the third cooling zone 23 via the third liquid inlet channel 53.

[0165] The multiple liquid inlet channels include a fourth liquid inlet channel 54, which includes a main liquid inlet channel 541, a first liquid inlet branch channel 542, a second liquid inlet branch channel 543, and a third liquid inlet branch channel 544.

[0166] Referring to Figure 9, one end of the main liquid inlet channel 541 is connected to the liquid inlet 10 and extends along the second direction. The first liquid inlet branch channel 542, the second liquid inlet branch channel 543 and the third liquid inlet branch channel 544 are connected to the main liquid inlet channel 541 and are arranged sequentially in the direction away from the cooling zone 20.

[0167] In other words, three branching nodes are provided at the other end of the main liquid inlet channel 541 to divide the main liquid inlet channel 541 into three branches. For example, the three branching nodes divide the main liquid inlet channel 541 into a first liquid inlet branch 542, a second liquid inlet branch 543, and a third liquid inlet branch 544. The second liquid inlet branch 543 is located on the side of the first liquid inlet branch 542 away from the cooling zone 20; the third liquid inlet branch 544 is located on the side of the second liquid inlet branch 543 away from the cooling zone 20.

[0168] The first liquid inlet branch 542 is connected to the third sub-cooling zone 241, and the second liquid inlet branch 543 and the third liquid inlet branch 544 are both connected to the fourth sub-cooling zone 242.

[0169] Given that the total flow path of the fluid in the fourth cooling zone 24 is longer, it is necessary to further reduce the pressure drop in the fourth cooling zone 24. Therefore, in this embodiment, three flow branching nodes are set on the fourth liquid inlet channel 54 to divide the main liquid inlet channel 541 into three branches. This allows the fourth cooling zone 24 to meet the design principle that the earlier the flow is branched, the lower the pressure drop can be, thereby enabling the fourth cooling zone 24 to meet the cooling flow requirements and ensuring that the cooling capacity of the fourth cooling zone 24 is as balanced as possible with the cooling capacity of the other cooling zones 20.

[0170] It should be noted that, to facilitate the layout of the liquid inlet channels of each cooling zone 20, the liquid inlet zone 50 is divided in this embodiment. For example, the liquid inlet zone 50 includes a first liquid inlet zone and a second liquid inlet zone; the first liquid inlet zone is located on one side of the plurality of cooling zones 20 in a first direction and is connected to the liquid inlet; the second liquid inlet zone is located on the first side of the plurality of cooling zones 20 in a second direction and is connected to the first liquid inlet zone; the second direction intersects the first direction. This arrangement allows for better control of the fluid flow path in the heat exchanger, enabling the fluid to enter each cooling zone 20 uniformly, thereby improving the cooling effect of the heat exchanger 100.

[0171] The main inlet channel 541 is located within the first inlet area, while the first inlet branch channel 542, the second inlet branch channel 543, and the third inlet branch channel 544 are located within the second inlet area. This arrangement allows for a better layout of the various inlet branches.

[0172] It should be noted that the second liquid inlet channel 52 and the third liquid inlet channel 53 are L-shaped, which helps to arrange them in the first liquid inlet area and the second liquid inlet area, and reduces the layout complexity of each channel in the heat exchange device 100.

[0173] In one possible implementation, referring to Figure 3, the heat exchanger 100 further includes a return port 60, which is located on the same side of the cooling zone 20 as the inlet port 10 and is connected to the return end of each cooling zone 20. Fluid enters the inlet end of each cooling zone 20 through the inlet port 10, then flows within each cooling zone 20, and finally returns to the return port 60 through the outlet end of each cooling zone 20.

[0174] The return port 60 and the inlet port 10 are located on the same side of the cooling zone 20. On the one hand, this facilitates the layout of each cooling zone 20 and reduces the complexity of the flow pipe arrangement in each cooling zone 20, thereby reducing the difficulty of manufacturing the heat exchange device. On the other hand, it also facilitates matching with the vehicle's water system and improves the applicability of the heat exchange device.

[0175] It should be noted that the return port 60 may include one main return branch or multiple main return branches. For example, the number of main return branches of the return port 60 is multiple, and the number of main return branches matches the number of cooling zones 20.

[0176] In one possible implementation, in the first direction, the flow channels of the multiple cooling zones 20, except for the cooling zone 20 closest to the liquid inlet 10, are provided with at least one confluence node 252. It should be noted that, since the cooling zone 20 closest to the liquid inlet 10 may not have a flow branch node 251, the confluence node 252 may not be provided in this cooling zone 20.

[0177] In the first direction and away from the liquid inlet 10, in any two adjacent cooling zones 20, the number of confluence nodes 252 in the cooling zone 20 closer to the liquid inlet 10 is less than or equal to the number of confluence nodes 252 in the cooling zone 20 away from the liquid inlet 10.

[0178] For example, please refer to Figures 3 to 10. The first cooling zone 21 is provided with one confluence node 252, the second cooling zone 22 is provided with one confluence node 252, the third cooling zone 23 is provided with two confluence nodes 252, and the fourth cooling zone 24 is provided with four confluence nodes 252.

[0179] It should be noted that the confluence node 252 that ultimately merges and flows out of the cooling zone in this embodiment is called the return end of the cooling zone.

[0180] It should be understood that the return liquid end of each cooling zone 20 can be directly connected to the return liquid port 60 or indirectly connected. For example, the heat exchange device 100 also includes a return liquid zone 70, which includes multiple return liquid channels; the return liquid ends of the multiple cooling zones 20 are connected to the return liquid port 60 through corresponding return liquid channels. In this way, the return liquid zone 70 can effectively collect the return liquid from each cooling zone 20, ensuring the uniformity of the return liquid, avoiding imbalances in liquid flow between the cooling zones 20, and improving the overall cooling effect of the heat exchange device.

[0181] At least a portion of the return liquid zone 70 is located on the second side of the cooling zone 20 along a second direction, which intersects the first direction. This arrangement, with the inlet liquid zone 50 and the return liquid zone 70 located on opposite sides of the second direction, allows for a more compact layout of the various areas of the heat exchange device.

[0182] In one possible implementation, the multiple return channels include a first return channel 71 and a second return channel 72; the first return channel 71 is connected to the first cooling zone 21, that is, the first return channel 71 connects the liquid outlet end and the return port 60 of the first cooling zone 21; the second return channel 72 is connected to the second cooling zone 22, that is, the second return channel 72 connects the liquid outlet end and the return port 60 of the second cooling zone 22.

[0183] The multiple return flow channels also include a third return flow channel 73, which includes a first return branch 731, a second return branch 732, and a first return main channel 733; the first return branch 731 and the second return branch 732 extend along a first direction and are arranged sequentially along a second direction; the first return main channel 733 extends along the second direction.

[0184] The first sub-cooling zone 231 is connected to the first main return liquid line 733 via the first return liquid branch line 731; the second sub-cooling zone 232 is connected to the first main return liquid line 733 via the second return liquid branch line 732; and then connected to the return liquid port 60 via the first main return liquid line 733. The second direction intersects with the first direction.

[0185] The multiple return flow channels also include a fourth return flow channel 74, which includes a third return flow branch 741, a fourth return flow branch 742, a fifth return flow branch 743, and a second return flow main 744.

[0186] The third return liquid branch 741, the fourth return liquid branch 742, and the fifth return liquid branch 743 are arranged sequentially in the direction away from the cooling zone 20, and all extend in the first direction; the second return liquid main 744 extends in the second direction.

[0187] The third return fluid branch 741 connects the third sub-cooling zone 241 and the second main return fluid line 744. The fourth return fluid branch 742 and the fifth return fluid branch 743 connect the fourth sub-cooling zone 242 and the second main return fluid line 744. Then, it connects to the return fluid port 60 through the second main return fluid line 744.

[0188] This implementation connects to each cooling zone 20 via independent return channels, ensuring uniform return of liquid to each cooling zone. This further ensures that the pressure drop of each cooling zone 20 gradually decreases along the first direction, thereby gradually increasing the heat exchange time between each cooling zone 20 and the battery pack. This helps to ensure a more balanced cooling capacity of each cooling zone 20.

[0189] It should be noted that, in order to facilitate the layout of the return liquid in each cooling zone 20, the return liquid zone 70 is divided in this embodiment. The return liquid zone 70 in this embodiment includes a first return liquid zone and a second return liquid zone.

[0190] The first return zone is located on one side of the multiple cooling zones in the first direction; the second return zone is located on the second side of the multiple cooling zones in the second direction and is connected to the first return zone.

[0191] Thus, the second return flow channel 72, the third return flow channel 73, and the fourth return flow channel 74 can be L-shaped, which facilitates the layout of each return flow channel.

[0192] In one possible implementation, referring to Figure 2, the heat exchange device 100 further includes a heat spreader 40, a flow channel plate 30, a first connector 80, and a second connector 90; the flow channel plate 30 is disposed on the heat spreader 40, and the cooling zone 20, the liquid inlet zone 50, and the liquid return zone 70 are formed on the flow channel plate 30; exemplaryly, the upper component can be formed on the flow channel plate 30 using a stamping process. Then, the flow channel plate 30 is welded to the heat spreader 40 using a brazing or laser welding process.

[0193] Both the first connector 80 and the second connector 90 are disposed on the heat exchange plate 40, and are located on the same side of the cooling zone 20. The first connector 80 is connected to the liquid inlet 10, and the second connector 90 is connected to the liquid return port 60. In this embodiment, the first connector 80 and the second connector 90 can be straight pipes or bent pipes, and can be manufactured by machining or casting.

[0194] This disclosure also provides a battery pack 300, referring to Figure 11, a plurality of battery packs 200 and a heat exchange device 100 described in any of the above embodiments; each battery pack 200 may further include a plurality of battery cells arranged sequentially along a second direction.

[0195] In this arrangement, multiple battery packs 200 are arranged sequentially along a first direction, and the cooling zone 20 of the heat exchange device 100 corresponds to each battery pack 200. For example, the number of battery packs 200 and the number of cooling zones 20 are the same. For instance, there are four battery packs 200 and four cooling zones 20. Along the first direction, the first cooling zone 21 is used to cool the first battery pack 200; the second cooling zone 22 is used to cool the second battery pack 200; the third cooling zone 23 is used to cool the third battery pack 200; and the fourth cooling zone 24 is used to cool the fourth battery pack 200.

[0196] In this embodiment, the heat exchange device 100 can be disposed on the top surface of the multiple battery packs 200 or on the bottom surface of the multiple battery packs 200. To improve the connection stability between the heat exchange device 100 and the battery packs 200, various mounting holes or mounting posts can be provided in the non-flow channel area of ​​the flow channel plate, and bolts can be used to achieve a fixed connection between the two.

[0197] In this embodiment, each cooling zone 20 cools down a single battery pack 200, which can ensure the temperature uniformity of the battery pack 200 in the width direction. At the same time, the cooling capacity of each cooling zone 20 of the heat exchange device 100 is relatively uniform, thus improving the temperature uniformity between each battery pack.

[0198] It should be noted that when a heat source is connected to the interface of the heat exchange device 100, the battery pack can also be heated to prevent the battery pack from becoming too cold.

[0199] This disclosure also provides an electrical device 400, as shown in Figure 12, which includes an electrical device 401 and a battery pack 300 as described in any of the above embodiments. The battery pack 300 is used to provide electrical energy to the electrical device 401.

[0200] In this embodiment, the electrical device 400 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.

[0201] In addition, electrical equipment 400 can also be other energy storage devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships and spacecraft, among which spacecraft can include airplanes, rockets, space shuttles or spacecraft.

[0202] Given that the electrical device 400 in this embodiment includes the battery pack 300 described in any of the above embodiments, the structure and beneficial effects of the battery pack 300 in the electrical device 400 will not be described in detail here.

[0203] 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.

[0204] 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.

[0205] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure 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 disclosure.

Claims

1. A heat exchange device (100), characterized in that, It includes a liquid inlet (10) and multiple cooling zones (20), the multiple cooling zones (20) are arranged sequentially along a first direction, and each cooling zone (20) is provided with a flow channel; in the first direction, the liquid inlet (10) is located on one side of the multiple cooling zones (20) and is connected to the liquid inlet end of each cooling zone (20); In the first direction, except for the cooling zone (20) closest to the liquid inlet (10), the flow channels of the remaining cooling zones (20) are provided with at least one diversion node (251); in the first direction and in the direction away from the liquid inlet (10), the number of diversion nodes (251) in the multiple cooling zones (20) tends to increase.

2. The heat exchange device (100) according to claim 1, characterized in that, In the first direction and in the direction away from the liquid inlet (10), in any two adjacent cooling zones (20), the number of the diversion nodes (251) in the cooling zone (20) closer to the liquid inlet (10) is less than or equal to the number of the diversion nodes (251) in the cooling zone (20) away from the liquid inlet (10).

3. The heat exchange device (100) according to claim 2, characterized in that, In the first direction and in the direction away from the liquid inlet (10), the number of the diversion nodes (251) in the plurality of cooling zones (20) gradually increases, except for the cooling zone (20) closest to the liquid inlet (10).

4. The heat exchange device (100) according to claim 2, characterized in that, In the first direction and in the direction away from the liquid inlet (10), the number of the diversion nodes (251) in the cooling zone (20) closest to the liquid inlet (10) and the cooling zone (20) second closest to the liquid inlet (10) among the plurality of cooling zones (20) is equal; the number of the diversion nodes (251) in the remaining cooling zones (20) gradually increases.

5. The heat exchange device (100) according to any one of claims 1-4, characterized in that, When the number of the diversion nodes (251) in any two adjacent cooling zones (20) is equal, the flow channel of each cooling zone (20) includes at least two diversion channels; the length of the diversion channel in the cooling zone (20) near the liquid inlet (10) is less than the length of the diversion channel in the cooling zone (20) away from the liquid inlet (10).

6. The heat exchange device (100) according to any one of claims 1-4, characterized in that, In the first direction, among the plurality of cooling zones (20), except for the cooling zone (20) closest to the liquid inlet (10), the remaining cooling zones (20) are provided with at least one confluence node (252); in the first direction, each cooling zone (20) includes a first edge (201) and a second edge (202) disposed opposite to each other, the first edge (201) being located between the liquid inlet (10) and the second edge (202); among the plurality of cooling zones (20), except for the cooling zone (20) closest to the liquid inlet (10), in any two adjacent cooling zones (20), the distance between the confluence node (252) in the cooling zone (20) closest to the liquid inlet (10) and the first edge (201) is a first distance, and the distance between the confluence node (252) in the cooling zone (20) far from the liquid inlet (10) and the first edge (201) is a second distance; the first distance is less than or equal to the second distance.

7. The heat exchange device (100) according to any one of claims 1-4, characterized in that, Each of the cooling zones (20) further includes a confluence node (252); in the first direction, a branch node (251) of each of the cooling zones (20) is disposed at at least one end of the cooling zone (20); and at least a portion of the confluence nodes (252) of the cooling zones (20) are disposed in the middle of the cooling zone (20).

8. The heat exchange device (100) according to any one of claims 1-4, characterized in that, In the first direction and in the direction away from the liquid inlet (10), the inner diameter of the flow channels of the plurality of cooling zones (20) tends to increase.

9. The heat exchange device (100) according to claim 8, characterized in that, In the first direction and away from the liquid inlet (10), the inner diameter of the flow channels of the plurality of cooling zones (20) gradually increases; or, in the first direction and away from the liquid inlet (10), in any two adjacent cooling zones (20), the inner diameter of the flow channel in the cooling zone (20) closer to the liquid inlet (10) is less than or equal to the inner diameter of the flow channel in the cooling zone (20) away from the liquid inlet (10).

10. The heat exchange device (100) according to any one of claims 1-4, characterized in that, The plurality of cooling zones (20) include a first cooling zone (21), which is the cooling zone (20) closest to the liquid inlet (10); the first cooling zone (21) is provided with a flow branch node (251).

11. The heat exchange device (100) according to claim 10, characterized in that, The diversion node (251) divides the flow channel (26) of the first cooling zone into a first diversion channel (261) and a second diversion channel (262); the first diversion channel (261) is located on the side of the second diversion channel (262) closer to the liquid inlet (10), and the length of the first diversion channel (261) is less than the length of the second diversion channel (262).

12. The heat exchange device (100) according to claim 11, characterized in that, The flow channel (26) of the first cooling zone includes a first constricted section (263), the inner diameter of which is smaller than the inner diameter of the rest of the flow channel (26) of the first cooling zone.

13. The heat exchange device (100) according to claim 12, characterized in that, The first cooling zone's flow channel (26) further includes a converging channel (264), which is connected to the first branch channel (261) and the second branch channel (262); the first constriction section (263) is provided in at least one of the first branch channel (261), the second branch channel (262) and the converging channel (264).

14. The heat exchange device (100) according to any one of claims 1-4, characterized in that, The plurality of cooling zones (20) further include a first cooling zone (21) and a second cooling zone (22) arranged along the first direction, wherein the second cooling zone (22) is disposed on the side of the first cooling zone (21) away from the liquid inlet (10); wherein the second cooling zone (22) is provided with a flow branch node (251), and the flow branch node (251) is disposed at the end of the flow channel (27) of the second cooling zone facing the first cooling zone (21).

15. The heat exchange device (100) according to claim 14, characterized in that, The flow branch node (251) of the second cooling zone (22) divides the flow channel (27) of the second cooling zone into a third flow branch channel (271) and a fourth flow branch channel (272); the third flow branch channel (271) is located on the side of the fourth flow branch channel (272) closer to the first cooling zone (21), and the length of the third flow branch channel (271) is less than or equal to the length of the fourth flow branch channel (272).

16. The heat exchange device (100) according to claim 15, characterized in that, The flow channel (27) of the second cooling zone includes a second constricted section (273), the inner diameter of which is smaller than the inner diameter of the rest of the flow channel (27).

17. The heat exchange device (100) according to claim 16, characterized in that, The second constriction section (273) is disposed in the third diversion channel (271) and / or the fourth diversion channel (272).

18. The heat exchange device (100) according to any one of claims 1-4, characterized in that, Along the first direction and away from the liquid inlet (10), the plurality of cooling zones (20) further include a first cooling zone (21), a second cooling zone (22), and a third cooling zone (23) arranged in sequence; the third cooling zone (23) is provided with three flow-diverting nodes (251); in the first direction, two of the flow-diverting nodes (251) are located on the side of the third cooling zone (23) close to the liquid inlet (10), and the other flow-diverting node (251) is located on the side of the third cooling zone (23) away from the liquid inlet (10).

19. The heat exchange device (100) according to claim 18, characterized in that, The third cooling zone (23) includes a first sub-cooling zone (231) and a second sub-cooling zone (232). The first sub-cooling zone (231) is located on the side of the second sub-cooling zone (232) close to the second cooling zone (22). Of the three diversion nodes (251), two diversion nodes (251) are located on the side of the first sub-cooling zone (231) close to the liquid inlet (10), and the other diversion node (251) is located on the side of the second sub-cooling zone (232) away from the liquid inlet (10).

20. The heat exchange device (100) according to any one of claims 1-4, characterized in that, Along the first direction and away from the liquid inlet (10), the plurality of cooling zones (20) further include a first cooling zone (21), a second cooling zone (22), a third cooling zone (23), and a fourth cooling zone (24) arranged in sequence; the third cooling zone (23) is provided with six flow-diverting nodes (251), in the first direction, three of the flow-diverting nodes (251) are located on the side of the fourth cooling zone (24) close to the liquid inlet (10), and the other three flow-diverting nodes (251) are located on the side of the fourth cooling zone (24) away from the liquid inlet (10).

21. The heat exchange device (100) according to claim 20, characterized in that, The fourth cooling zone (24) includes a third sub-cooling zone (241) and a fourth sub-cooling zone (242); of the six diversion nodes (251), three of the diversion nodes (251) are located on the side of the third sub-cooling zone (241) close to the liquid inlet (10), and the other three of the diversion nodes (251) are located on the side of the fourth sub-cooling zone (242) away from the liquid inlet (10).

22. The heat exchange device (100) according to claim 21, characterized in that, Along the first direction, the areas of the first cooling zone (21), the second cooling zone (22), the third cooling zone (23), and the fourth cooling zone (24) gradually increase.

23. The heat exchange device (100) according to claim 21 or 22, characterized in that, The heat exchange device (100) further includes a liquid inlet zone (50), and the liquid inlet (10) is connected to each of the cooling zones (20) through the liquid inlet zone (50).

24. The heat exchange device (100) according to claim 23, characterized in that, The liquid inlet area (50) includes multiple liquid inlet channels, which are connected to multiple cooling areas (20).

25. The heat exchange device (100) according to claim 24, characterized in that, The multiple liquid inlet channels include a first liquid inlet channel (51), a second liquid inlet channel (52), and a third liquid inlet channel (53); the liquid inlet (10) is connected to the first cooling zone (21) through the first liquid inlet channel (51); the liquid inlet (10) is connected to the second cooling zone (22) through the second liquid inlet channel (52); and the liquid inlet (10) is connected to the third cooling zone (23) through the third liquid inlet channel (53).

26. The heat exchange device (100) according to claim 24 or 25, characterized in that, The plurality of liquid inlet channels include a fourth liquid inlet channel (54), which includes a main liquid inlet channel (541), a first liquid inlet branch channel (542), a second liquid inlet branch channel (543), and a third liquid inlet branch channel (544). The main liquid inlet channel (541) is connected to the liquid inlet (10) and extends along a second direction. The first liquid inlet branch channel (542), the second liquid inlet branch channel (543), and the third liquid inlet branch channel (544) are respectively connected to the main liquid inlet channel (541) and are arranged sequentially in a direction away from the cooling zone (20). The first liquid inlet branch channel (542) is connected to the third sub-cooling zone (241). The second liquid inlet branch channel (543) and the third liquid inlet branch channel (544) are both connected to the fourth sub-cooling zone (242).

27. The heat exchange device (100) according to claim 26, characterized in that, The liquid inlet area (50) includes a first liquid inlet area and a second liquid inlet area; the first liquid inlet area is located on one side of the plurality of cooling areas (20) in the first direction and is connected to the liquid inlet (10); the second liquid inlet area is located on the first side of the plurality of cooling areas (20) in the second direction and is connected to the first liquid inlet area; the second direction intersects the first direction.

28. The heat exchange device (100) according to claim 27, characterized in that, The main inlet channel (541) is located in the first inlet area, and the first inlet branch channel (542), the second inlet branch channel (543) and the third inlet branch channel (544) are located in the second inlet area.

29. The heat exchange device (100) according to any one of claims 1-4, characterized in that, The heat exchange device (100) further includes a return port (60), which is located on the same side of the cooling zone (20) as the inlet (10) and is connected to the return end of each cooling zone (20).

30. The heat exchange device (100) according to claim 29, characterized in that, In the first direction, except for the cooling zone (20) closest to the liquid inlet (10), the flow channels of the remaining cooling zones (20) are provided with at least one confluence node (252); in the first direction and away from the liquid inlet (10), in any two adjacent cooling zones (20), the number of confluence nodes (252) in the cooling zone (20) closer to the liquid inlet (10) is less than or equal to the number of confluence nodes (252) in the cooling zone (20) away from the liquid inlet (10).

31. The heat exchange device (100) according to claim 30, characterized in that, The heat exchange device (100) further includes a liquid return zone (70), which includes multiple liquid return channels; the liquid return ends of multiple cooling zones (20) are connected to the liquid return port (60) through the corresponding liquid return channels.

32. The heat exchange device (100) according to claim 31, characterized in that, The plurality of return channels include a first return channel (71) and a second return channel (72); the first return channel (71) connects the liquid outlet of the first cooling zone (21) and the return port (60), and the second return channel (72) connects the liquid outlet of the second cooling zone (22) and the return port (60).

33. The heat exchange device (100) according to claim 32, characterized in that, The plurality of return channels also include a third return channel (73); the third return channel (73) includes a first return branch (731), a second return branch (732), and a first return main channel (733); the first return branch (731) and the second return branch (732) extend along a first direction and are arranged sequentially along a second direction; the first return main channel (733) extends along the second direction; wherein, the first sub-cooling zone (231) is connected to the first return main channel (733) through the first return branch (731); the second sub-cooling zone (232) is connected to the first return main channel (733) through the second return branch (732); the second direction intersects the first direction.

34. The heat exchange device (100) according to claim 33, characterized in that, The plurality of return channels also include a fourth return channel (74), which includes a third return branch (741), a fourth return branch (742), a fifth return branch (743), and a second main return channel (744). The third return branch (741), the fourth return branch (742), and the fifth return branch (743) are arranged sequentially in a direction away from the cooling zone (20) and all extend along the first direction. The second main return channel (744) extends along the second direction. The third return branch (741) connects the third sub-cooling zone (241) and the second main return channel (744), and the fourth return branch (742) and the fifth return branch (743) connect the fourth sub-cooling zone (242) and the second main return channel (744).

35. The heat exchange device (100) according to any one of claims 31-34, characterized in that, The return liquid area (70) includes a first return liquid area and a second return liquid area. The first return liquid area is located on one side of the plurality of cooling areas (20) in the first direction. The second return liquid area is located on the second side of the plurality of cooling areas (20) in the second direction and is connected to the first return liquid area.

36. The heat exchange device (100) according to any one of claims 1-4, characterized in that, The heat exchange device (100) includes a temperature distribution plate (40), a flow channel plate (30), a first connector (80), and a second connector (90); the flow channel plate (30) is disposed on the temperature distribution plate (40), and the cooling zone (20), the liquid inlet zone (50), and the liquid return zone (70) are formed on the flow channel plate (30); the first connector (80) and the second connector (90) are both disposed on the temperature distribution plate (40), the first connector (80) and the second connector (90) are located on the same side of the cooling zone (20), the first connector (80) is connected to the liquid inlet (10), and the second connector (90) is connected to the liquid return port (60).

37. A battery pack (300), characterized in that, It includes a plurality of battery packs (200) and a heat exchange device (100) according to any one of claims 1-36; wherein the plurality of battery packs (200) are arranged sequentially along a first direction, and each cooling zone (20) of the heat exchange device (100) corresponds to each of the battery packs (200).

38. An electrical appliance (400), characterized in that, It includes an electrical device (401) and a battery pack (300) as described in claim 37; the battery pack (300) is electrically connected to the electrical device (401) and is used to provide electrical energy to the electrical device (401).

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