Heat exchange system, battery pack and electric equipment

Abstract

The utility model provides a heat exchange system, a battery pack and electric equipment. The heat exchange system comprises a first heat exchange piece and a second heat exchange piece, and the first heat exchange piece is arranged on one side of the battery module and makes contact with the bottom face of the battery module. The second heat exchange part is arranged on one side, facing the battery modules, of the first heat exchange part and is inserted between the two battery packs; the first heat exchange piece and the second heat exchange piece are brazing liquid cooling plates. The assembly process of the heat exchange system and the battery module is simplified.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and in particular to a heat exchange system, a battery pack, and electrical equipment. Background Technology

[0002] 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 battery modules housed within the housing. Battery modules generate a significant amount of heat during operation, usually requiring a heat exchange system within the housing to dissipate this heat.

[0003] However, the current heat exchange system and battery module assembly process is complex, making it inconvenient to disassemble and assemble the heat exchange system. Utility Model Content

[0004] In view of the above problems, embodiments of this application provide a heat exchange system, a battery pack, and electrical equipment, which can simplify the assembly process of the heat exchange system and the battery module.

[0005] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0006] In a first aspect, embodiments of this application provide a heat exchange system adapted to exchange heat with a battery module, the battery module comprising two battery packs arranged along a first direction; the heat exchange system includes:

[0007] The first heat exchanger is disposed on one side of the battery module and in contact with the bottom surface of the battery module.

[0008] The second heat exchanger is disposed on the side of the first heat exchanger facing the battery module and inserted between the two battery modules; wherein, both the first heat exchanger and the second heat exchanger are brazed liquid cooling plates.

[0009] In one possible implementation, the second heat exchanger includes a first flow channel plate and a second flow channel plate connected to each other, the first flow channel plate having a first flow channel and the second flow channel plate having a second flow channel; both the first flow channel and the second flow channel are S-shaped.

[0010] The first flow channel and the second flow channel are symmetrically arranged and surround the second heat exchange flow channel of the second heat exchanger.

[0011] In one possible implementation, the first heat exchanger includes a first heat exchange channel; the first heat exchange channel includes a first confluence channel, a plurality of third channels and a second confluence channel, the plurality of third channels being interconnected and forming a serpentine structure; the first confluence channel is connected to its adjacent third channel, and the second confluence channel is connected to its adjacent third channel.

[0012] The first confluence channel extends along the second direction, and the second direction intersects with the first direction.

[0013] In one possible implementation, each of the third flow channels is provided with at least one diversion node, which is used to divide the corresponding third flow channel into at least two sub-flow channels.

[0014] In one possible implementation, the battery module includes multiple modules, and a second heat exchanger is provided between the battery packs of each battery module.

[0015] In one possible implementation, the first heat exchanger includes a first liquid inlet and a first liquid outlet, and the second heat exchanger includes a second liquid inlet and a second liquid outlet; the two second liquid inlets of adjacent second heat exchangers are connected by a first connecting pipe, and the two second liquid outlets are connected by a second connecting pipe.

[0016] The heat exchange system further includes an inlet pipe and an outlet pipe; the inlet pipe is connected to the first inlet connector and the second inlet connector respectively, and the outlet pipe is connected to the first outlet connector and the second outlet connector respectively.

[0017] In one possible implementation, both the first connecting pipe and the second connecting pipe include a pipe body and clips disposed at both ends of the pipe body, the clips engaging with the corresponding fitting surfaces of the connectors.

[0018] In one possible implementation, the heat exchange system further includes a first transfer pipe, a first end of which is connected to the liquid inlet pipe, a second end of which is connected to the second liquid inlet connector of the adjacent second heat exchanger, and a third end of which is connected to the first liquid inlet connector of the first heat exchanger.

[0019] Secondly, embodiments of this application provide a battery pack, including at least one battery module and the heat exchange system described in the first aspect; the heat exchange system is used for heat exchange of at least one of the battery modules.

[0020] Thirdly, embodiments of this application provide an electrical device, including an electrical device and a battery pack as described in the second aspect; the battery pack is electrically connected to the electrical device to provide electrical energy to the electrical device.

[0021] In the heat exchange system, battery pack, and electrical equipment provided in this application embodiment, a second heat exchanger is inserted between two battery packs. This places the second heat exchanger on one side of one of the battery packs, avoiding the need for liquid cooling plates on both large areas of the battery pack. Furthermore, both the first and second heat exchangers are brazed liquid cooling plates. Compared to harmonica-style liquid cooling plates in related technologies, brazed liquid cooling plates can be integrally formed, reducing the number of parts and connection interfaces. This makes the heat exchange system easier to install and fix in narrow gaps between battery modules, significantly improving production efficiency and product consistency.

[0022] Furthermore, the first heat exchanger is located at the bottom of the battery module, exchanging heat with the bottom of the battery module. Thus, the first and second heat exchangers work together to enhance the heat exchange capacity of the system, enabling rapid heat exchange with the battery module and increasing the stability of the battery pack.

[0023] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the heat exchange system, battery pack, and electrical equipment provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A perspective view of the battery pack provided in an embodiment of this application;

[0026] Figure 2 A top view of the battery pack provided in an embodiment of this application;

[0027] Figure 3 For along Figure 2 A cross-sectional view along the AA direction;

[0028] Figure 4 A perspective view of the heat exchange system provided in the embodiments of this application;

[0029] Figure 5 A top view of the heat exchange system provided in an embodiment of this application;

[0030] Figure 6 A perspective view of the first heat exchanger provided in an embodiment of this application;

[0031] Figure 7 A schematic diagram of the first heat exchange channel of the first heat exchanger provided in the embodiments of this application;

[0032] Figure 8 A perspective view of the second heat exchanger provided in an embodiment of this application;

[0033] Figure 9 A right view of the second heat exchanger provided in an embodiment of this application;

[0034] Figure 10 A left view of the second heat exchanger provided in an embodiment of this application;

[0035] Figure 11 For along Figure 10 Cross-sectional view along the BB direction;

[0036] Figure 12 This is a schematic diagram of the first connecting pipe and the second connecting pipe provided in the embodiments of this application.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1000: Battery pack;

[0039] 100: Heat exchange system;

[0040] 110: First heat exchanger; 111: First manifold; 112: Third manifold; 113: Second manifold; 114: First liquid inlet connector; 115: First liquid outlet connector;

[0041] 120: Second heat exchanger; 121: First flow channel plate; 1211: First flow channel; 122: Second flow channel plate; 1221: Second flow channel; 123: First heat exchange flow channel; 124: Second liquid inlet connector; 125: Second liquid outlet connector; 126: Engaging surface;

[0042] 130: Buffer layer;

[0043] 140: First connecting pipe; 141: Pipe body; 142: Clip; 143: Sealing groove;

[0044] 150: Second connecting pipe;

[0045] 160: Liquid inlet pipe;

[0046] 170: Liquid outlet pipe;

[0047] 180: First transfer pipe;

[0048] 190: Second transfer pipe;

[0049] 200: Battery module;

[0050] 210: Battery pack; 211: Individual battery cell. Detailed Implementation

[0051] Heat exchange systems in related technologies typically include liquid cooling plates, often with a harmonica-tube structure, meaning the liquid cooling plate is made of multiple parallel flat aluminum tubes welded to manifolds. To improve the heat exchange capacity, the system is usually positioned to contact two large surfaces of the battery module, increasing the heat exchange area. However, the space between adjacent battery modules is relatively narrow, and the harmonica-tube liquid cooling plates need to be arranged within this limited space, leading to complex assembly processes and making the disassembly and reassembly of the heat exchange system inconvenient.

[0052] To address the aforementioned technical problems, embodiments of this application provide a heat exchange system, a battery pack, and electrical equipment, by inserting a second heat exchanger between two battery packs. This allows the second heat exchanger to be positioned on one side of one of the battery packs, avoiding the need for liquid cooling plates on both large areas of the battery pack. Furthermore, both the first and second heat exchangers are brazed liquid cooling plates. Compared to harmonica-style liquid cooling plates in related technologies, brazed liquid cooling plates can be integrally formed, reducing the number of components and connection interfaces. This makes the heat exchange system easier to install and fix in narrow gaps between battery modules, significantly improving production efficiency and product consistency.

[0053] Furthermore, the first heat exchanger is located at the bottom of the battery module, exchanging heat with the bottom of the battery module. Thus, the first and second heat exchangers work together to enhance the heat exchange capacity of the system, enabling rapid heat exchange with the battery module and increasing the stability of the battery pack.

[0054] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0055] Please refer to Figures 1 to 3 This application provides a battery pack 1000, which serves as an energy storage component and can be applied to electrical equipment. For example, the battery pack 1000 can be applied to a vehicle to provide electrical energy to ensure the normal operation of the vehicle.

[0056] The battery pack 1000 includes a battery module 200, which includes two battery packs 210 arranged along a first direction. Each battery pack 210 includes multiple battery cells 211 arranged along a second direction. Taking a rectangular battery cell 211 as an example, the first direction is the width direction of the battery cell 211. Figure 1 and Figure 2 The first direction is the X-direction, and the second direction is the length direction of the battery cell 211, i.e. Figure 1 and Figure 2 Center Y direction.

[0057] It should be understood that, in order to facilitate a detailed description of the structure of the battery module 200, it is advisable to refer to... Figure 2 All battery cells 211 within the small dashed box are defined as a battery pack 210, and all battery cells 211 within the two small dashed boxes are defined as a battery module 200.

[0058] Please refer to Figures 4 to 11 The battery pack 1000 also includes a heat exchange system 100, which is adapted to exchange heat with the battery module 200 to keep the battery module 200 at a suitable temperature. It should be noted that in this embodiment, heat exchange can be understood as the heat exchange system 100 being able to cool or heat the battery module 200. Specifically, the type of fluid flowing within the heat exchange system 100 can be freely selected depending on the environment in which the battery module 200 is located. For example, when the heat exchange system 100 is used to cool the battery module 200, the fluid may include a refrigerant, CO2, ethylene glycol, or water.

[0059] The heat exchange system 100 includes a first heat exchange element 110, which is disposed on one side of the battery module 200 and in contact with the bottom surface of the battery module 200. That is, along the thickness direction of the battery module 200, the first heat exchange element 110 is located on the bottom side of the battery module 200 and exchanges heat with the battery module 200.

[0060] The heat exchange system 100 also includes a second heat exchanger 120, which is disposed on the side of the first heat exchanger 110 facing the battery module 200 and inserted between the two battery packs 210; wherein, both the first heat exchanger 110 and the second heat exchanger 120 are brazed liquid cooling plates. It should be noted that when there are multiple battery modules 200, one second heat exchanger 120 is disposed between the battery packs 210 of each battery module 200.

[0061] from Figure 1It is evident that the second heat exchanger 120 is disposed on one side of the battery pack 210, and the second heat exchanger 120 exchanges heat with one of the large surfaces of the battery pack 210. The first heat exchanger 110 is disposed at the bottom of the battery module 200 and is used to exchange heat with the bottom surface of the battery module 200.

[0062] In this way, on the one hand, liquid cooling plates are not placed on both large areas of the battery pack 210, and on the other hand, the first heat exchanger 110 and the second heat exchanger 120 are brazed liquid cooling plates. Compared with the harmonica-type liquid cooling plates in related technologies, the brazed liquid cooling plates can be integrally formed, reducing the number of parts and connection interfaces, making it easier to install and fix the heat exchange system 100 in the narrow gap of the battery module 200, significantly improving production efficiency and product consistency.

[0063] Secondly, the first heat exchanger 110 and the second heat exchanger 120 work together to improve the heat exchange capacity of the heat exchange system 100, thereby quickly exchanging heat with the battery module 200 and increasing the stability of the battery pack 1000.

[0064] It should be noted that the second heat exchanger 120 may or may not be connected to the first heat exchanger 110. For example, please refer to... Figure 3 The first heat exchanger 110 and the second heat exchanger 120 are arranged at intervals so that there is a gap between the bottom of the second heat exchanger 120 and the top of the first heat exchanger 110. This gap can facilitate the air circulation in the battery pack 1000 and further improve the heat exchange capacity of the heat exchange system 100.

[0065] In one possible implementation, please refer to Figures 8 to 11 The second heat exchanger 120 includes a first flow channel plate 121 and a second flow channel plate 122 connected to each other. The first flow channel plate 121 has a first flow channel 1211, and the second flow channel plate 122 has a second flow channel 1221; both the first flow channel 1211 and the second flow channel 1221 are S-shaped. Please refer to [reference needed]. Figure 11 The first flow channel 1211 and the second flow channel 1221 are symmetrically arranged and surround the second heat exchange flow channel 123 of the second heat exchange element 120.

[0066] In other words, the first flow channel 1211 and the second flow channel 1221 are arranged opposite to each other, which increases the area of ​​the second heat exchange flow channel 123, thereby improving the smoothness of fluid flow. Furthermore, both the first flow channel 1211 and the second flow channel 1221 are S-shaped, which extends the fluid flow path and significantly increases the contact time between the fluid and the wall of the first heat exchange component, resulting in more complete heat exchange. In addition, the S-shaped meandering structure causes the fluid to continuously change direction during flow, enhancing the turbulence effect, breaking the thermal boundary layer, and making the temperature distribution of the battery module more uniform.

[0067] It is important to understand that both the first flow channel plate 121 and the second flow channel plate 122 have uneven surfaces. To facilitate matching with the large surface of the battery pack 210, a buffer layer 130 is provided on the surface of the second heat exchanger 120 facing the battery pack 210. The buffer layer 130 can be cushioning foam, effectively filling the microscopic gaps between the second heat exchanger 120 and the large surface of the battery pack 210, thus reducing contact thermal resistance. This design ensures a tight fit between the heat exchange surface and the battery pack, significantly improving thermal conductivity.

[0068] It is also important to understand that the second heat exchanger 120 can be formed by brazing two aluminum plates or by stamping or blowing two aluminum plates.

[0069] Please refer to Figure 6 and Figure 7 The first heat exchanger 110 includes a first heat exchange channel; the first heat exchange channel includes a first confluence channel 111, multiple third channels 112, and a second confluence channel 113. The multiple third channels 112 are interconnected and form a serpentine structure. The first confluence channel 111 is connected to its adjacent third channel 112, and the second confluence channel 113 is connected to its adjacent third channel 112. In this way, the fluid can continuously change direction during the flow process, enhancing the turbulence effect of the fluid, breaking the thermal boundary layer, and making the temperature distribution of the battery module more uniform.

[0070] It should be noted that the first heat exchanger 110 can be composed of a flow channel plate and a heat spreader plate, and the first heat exchange flow channel is formed by a stamping process. Subsequently, the flow channel plate and the heat spreader plate are welded together by a brazing process to form a closed whole.

[0071] In this embodiment, the first confluence channel 111 extends along the second direction, and its length is approximately equal to the length of the battery module 200 in the second direction. In this way, the fluid first flows into the surrounding area and then into each region, reducing the temperature difference between the battery cells 211.

[0072] Please continue to refer to this. Figure 7 Each third flow channel 112 is provided with at least one flow branch node 114, and the at least one flow branch node 114 is used to divide the corresponding third flow channel 112 into at least two sub-flow channels.

[0073] In this embodiment, the shunt node 114 can divide the corresponding third flow channel 112 into at least two sub-flow channels, which is equivalent to shortening the length of each sub-flow channel, thereby reducing the voltage drop of each sub-flow channel, making the voltage drop of each third flow channel 112 as consistent as possible, thereby improving the temperature uniformity of each third flow channel 112 and ensuring the heat balance of the battery pack 1000.

[0074] It should be noted that, in two adjacent third channels 112, the number of branch nodes 114 in the third channel 112 that is far from the outlet of the first confluence channel 111 is greater than or equal to the number of branch nodes 114 in the third channel 112 that is close to the outlet of the first confluence channel 111.

[0075] In this embodiment, by setting fewer branch nodes 114 in the third channel 112 near the first confluence channel 111 and more branch nodes 114 in the third channel 112 far from the first confluence channel 111, it is possible to ensure that the fluid maintains a higher pressure drop near the inlet of the third channel 112 near the first confluence channel 111. This ensures that the fluid can quickly reach the more distant third channel 112, further improving the uniformity of the heat exchange capacity of each third channel 112.

[0076] It should be noted that when there are multiple battery modules 200, there are also multiple second heat exchangers 120. In this case, multiple second heat exchangers 120 need to be connected together.

[0077] The second heat exchanger 120 includes a second liquid inlet connector 124 and a second liquid outlet connector 125; the two second liquid inlet connectors 124 of adjacent second heat exchangers 120 are connected through a first connecting pipe 140, and the two second liquid outlet connectors 125 are connected through a second connecting pipe 150.

[0078] The first heat exchanger 110 includes a first liquid inlet connector 114 and a first liquid outlet connector 115. The heat exchange system 100 also includes a liquid inlet pipe 160 and a liquid outlet pipe 170; the liquid inlet pipe 160 is connected to the first liquid inlet connector 114 and the second liquid inlet connector 124 respectively, and the liquid outlet pipe 170 is connected to the first liquid outlet connector 115 and the second liquid outlet connector 125 respectively, so as to realize efficient flow of fluid in the heat exchange system 100.

[0079] Please refer to Figure 12 The first connecting pipe 140 and the second connecting pipe 150 both include a pipe body 141 and buckles 142 provided at both ends of the pipe body 141. The buckles 142 engage with the corresponding fitting surfaces of the connectors.

[0080] For example, please refer to Figure 3 and Figure 11The outer peripheral surface of the second liquid inlet connector 124 forms a locking surface 126. In any two adjacent second heat exchangers 120, one end of the first connecting pipe 140 is inserted into the second liquid inlet connector 124 of one of the second heat exchangers 120, and the buckle 142 of the first connecting pipe 140 is engaged with the locking surface 126 of the second liquid inlet connector 124 to achieve the connection between the first connecting pipe 140 and one of the second heat exchangers 120. It should be noted that the connection method between the first connecting pipe 140 and the other second heat exchanger 120, and between the second connecting pipe 150 and the two second heat exchangers 120, is the same as described above, and will not be elaborated further in this embodiment.

[0081] In some embodiments, a sealing groove 143 is also provided on the first connecting pipe 140. The sealing groove 143 is used to provide a sealing ring to improve the sealing performance between the first connecting pipe 140 and the second heat exchanger 120.

[0082] In one possible implementation, the heat exchange system 100 further includes a first transfer pipe 180, the first end of which is connected to the liquid inlet pipe 160, the second end of which is connected to the second liquid inlet connector 124 of the adjacent second heat exchanger 120, and the third end of which is connected to the first liquid inlet connector 114 of the first heat exchanger 110.

[0083] Meanwhile, the heat exchange system 100 also includes a second transfer pipe 190. The first end of the second transfer pipe 190 is connected to the liquid outlet pipe 170, the second end of the second transfer pipe 190 is connected to the second liquid outlet connector 125 of the adjacent second heat exchange element 120, and the third end of the second transfer pipe 190 is connected to the first liquid outlet connector 115 of the first heat exchange element 110. This allows for normal fluid flow within the heat exchange system 100.

[0084] This application also provides an electrical device, including an electrical device and a battery pack as described in any of the above embodiments. The battery pack is electrically connected to the electrical device and is used to provide electrical energy to the electrical device.

[0085] The electrical equipment in this application embodiment can be a vehicle, for example, a new energy vehicle, which 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.

[0086] In addition, electrical equipment can also serve as other energy storage devices, such as mobile phones, portable devices, laptops, electric toys, power tools, ships, and spacecraft. Among these, spacecraft can include airplanes, rockets, space shuttles, or spacecraft.

[0087] Since the electrical device in this embodiment includes the battery pack described in any of the above embodiments, the electrical device includes the battery pack structure and beneficial effects, which will not be described in detail here.

[0088] 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.

[0089] 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.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A heat exchange system adapted to exchange heat with a battery module, the battery module comprising two battery packs arranged along a first direction; characterized in that, The heat exchange system includes: The first heat exchanger is disposed on one side of the battery module and in contact with the bottom surface of the battery module. The second heat exchanger is disposed on the side of the first heat exchanger facing the battery module and inserted between the two battery modules; wherein, both the first heat exchanger and the second heat exchanger are brazed liquid cooling plates.

2. The heat exchange system according to claim 1, characterized in that, The second heat exchanger includes a first flow channel plate and a second flow channel plate connected to each other. The first flow channel plate has a first flow channel, and the second flow channel plate has a second flow channel. Both the first flow channel and the second flow channel are S-shaped. The first flow channel and the second flow channel are symmetrically arranged and surround the second heat exchange flow channel of the second heat exchanger.

3. The heat exchange system according to claim 2, characterized in that, The first heat exchanger includes a first heat exchange channel; the first heat exchange channel includes a first confluence channel, a plurality of third channels and a second confluence channel, the plurality of third channels are interconnected and form a serpentine structure; the first confluence channel is connected to its adjacent third channel, and the second confluence channel is connected to its adjacent third channel; The first confluence channel extends along the second direction, and the second direction intersects with the first direction.

4. The heat exchange system according to claim 3, characterized in that, Each of the third flow channels is provided with at least one flow splitting node, which is used to divide the corresponding third flow channel into at least two sub-flow channels.

5. The heat exchange system according to any one of claims 1-4, characterized in that, The battery module includes multiple modules, and each battery module has a second heat exchanger between its battery cells.

6. The heat exchange system according to claim 5, characterized in that, The first heat exchanger includes a first liquid inlet and a first liquid outlet, and the second heat exchanger includes a second liquid inlet and a second liquid outlet; the two second liquid inlets of adjacent second heat exchangers are connected by a first connecting pipe, and the two second liquid outlets are connected by a second connecting pipe. The heat exchange system further includes an inlet pipe and an outlet pipe; the inlet pipe is connected to the first inlet connector and the second inlet connector respectively, and the outlet pipe is connected to the first outlet connector and the second outlet connector respectively.

7. The heat exchange system according to claim 6, characterized in that, Both the first connecting pipe and the second connecting pipe include a pipe body and buckles disposed at both ends of the pipe body, wherein the buckles engage with the corresponding fitting surfaces of the connectors.

8. The heat exchange system according to claim 7, characterized in that, The heat exchange system further includes a first transfer pipe, the first end of which is connected to the liquid inlet pipe, the second end of which is connected to the second liquid inlet connector of the adjacent second heat exchanger, and the third end of which is connected to the first liquid inlet connector of the first heat exchanger.

9. A battery pack, characterized in that, It includes at least one battery module and a heat exchange system according to any one of claims 1-8; the heat exchange system is used for heat exchange of at least one of the battery modules.

10. An electrical appliance, characterized in that, It includes an electrical device and the battery pack of claim 9; the battery pack is electrically connected to the electrical device to provide electrical energy to the electrical device.

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