Expansion kettle, thermal management system and vehicle

Abstract

The utility model provides an expansion kettle, a heat management system and a vehicle. The expansion kettle comprises a kettle main body part and a fluid separation part. The kettle body part comprises a top wall, a bottom wall and a side wall. A liquid cavity is defined by the top wall, the side wall and the bottom wall. The top wall and the bottom wall are distributed along a first direction. And the kettle main body part comprises a second inlet pipe and a second outlet pipe which are communicated with the liquid cavity. The fluid separation part comprises a main body unit arranged on the bottom wall. The main body unit is provided with a separation cavity. And the separation cavity is communicated with the liquid cavity. And the fluid separation part further comprises a first inlet pipe and a first outlet pipe which are respectively communicated with the separation cavity. The first outlet pipe and the first inlet pipe are respectively arranged on the main body unit. The first outlet tube is located between the first inlet tube and the bottom wall in the first direction.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology, and in particular to an expansion kettle, a thermal management system and a vehicle. Background Art

[0002] The thermal management system usually has a motor cooling circuit and a battery cooling circuit. The reversing valve in the thermal management system can realize the series or parallel connection of the motor cooling circuit and the battery cooling circuit. When the motor cooling circuit and the battery cooling circuit are connected in series, the coolants in the two cooling circuits mix with each other. However, since the motor water temperature is usually around 65°C and the battery temperature is usually around 15-25°C, the mixed heat of the coolant in the motor cooling circuit and the coolant in the battery cooling circuit will affect the cooling or heating efficiency of the battery, and thus affect the energy consumption.

[0003] In addition, there may be certain bubbles in the coolant during the flow of the thermal management system, which may reduce the heat exchange effect or produce abnormal noise. How to reduce the impact of energy consumption while ensuring the heat exchange effect is a problem that industry insiders in the vehicle field are concerned about. Utility Model Content

[0004] The present application provides an expansion kettle, a thermal management system and a vehicle to solve some or all of the deficiencies in the related art.

[0005] A first aspect of the present application provides an expansion kettle, comprising:

[0006] A kettle body, comprising a top wall, a bottom wall and a side wall, wherein the top wall, the side wall and the bottom wall enclose a liquid cavity; the top wall and the bottom wall are distributed along a first direction; the kettle body comprises a second inlet pipe and a second outlet pipe communicating with the liquid cavity; and

[0007] The fluid separation part comprises a main body unit arranged on the bottom wall, wherein the main body unit is provided with a separation cavity; the separation cavity is communicated with the liquid cavity;

[0008] Wherein, the fluid separation part also includes a first inlet pipe and a first outlet pipe respectively connected to the separation chamber; the first outlet pipe and the first inlet pipe are respectively arranged in the main unit; the first outlet pipe is located between the first inlet pipe and the bottom wall in the first direction.

[0009] Further, the bottom wall includes a protrusion; the main body unit is connected to the protrusion; the protrusion is provided with a connecting cavity; the connecting cavity connects the separation cavity and the liquid cavity; wherein, in the direction from the main body unit to the main body of the kettle, the flow area of ​​the connecting cavity gradually decreases.

[0010] Furthermore, the separation chamber is configured as a cylindrical chamber; and the first inlet pipe is connected to the separation chamber along a tangent direction of the cylindrical chamber.

[0011] Furthermore, the fluid separation part includes a guide unit arranged on the side of the main unit away from the bottom wall; the guide unit is provided with a guide cavity connected to the separation cavity; the guide cavity is arranged in a spiral shape extending toward the main unit around the axis of the separation cavity; and the first inlet pipe is arranged in the guide unit.

[0012] Furthermore, the fluid separation portion includes a reinforcing rib; the reinforcing rib is arranged on a side of the fluid separation portion close to the bottom wall; and the reinforcing rib extends along a direction in which the fluid separation portion and the kettle main body are connected.

[0013] Furthermore, the second inlet pipe is arranged close to the top wall; and the second outlet pipe is arranged close to the bottom wall.

[0014] Furthermore, the kettle main body includes a first kettle body and a second kettle body; the top wall is arranged on the first kettle body; the bottom wall is arranged on the second kettle body; the first kettle body is provided with a first cavity; the second kettle body is provided with a second cavity; the first kettle body and the second kettle body are fixedly connected so that the first cavity and the second cavity enclose the liquid cavity.

[0015] Furthermore, the bottom wall is fixedly connected to the main unit; and / or the wall thickness of the fluid separation part is uniform.

[0016] A second aspect of the present application provides a thermal management system, comprising a motor, a battery, and an expansion kettle as described in the above embodiment; the battery is connected to the expansion kettle through the first inlet pipe and the first outlet pipe;

[0017] The kettle body includes a second inlet pipe and a second outlet pipe communicating with the liquid chamber; the motor is connected to the expansion kettle via the second inlet pipe and the second outlet pipe.

[0018] A third aspect of the present application provides a vehicle, comprising the thermal management system described in the aforementioned embodiment.

[0019] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0020] It can be seen from the above embodiments that the expansion kettle of the present application enables the battery cooling circuit to be independent to a certain extent, avoiding heat loss or heat gain of the battery coolant, thereby ensuring the cooling or heating efficiency of the battery. At the same time, since the main unit of the fluid separation part is directly connected to the bottom wall of the kettle body, compared with the technical solution connected by a pipeline, the volume of the expansion kettle of the present application is further reduced, which is conducive to optimizing the overall size of the thermal management system.

[0021] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 Shown is an overall schematic diagram of an embodiment of an expansion kettle of the present application;

[0024] Figure 2 A partial longitudinal sectional schematic diagram of an embodiment of an expansion kettle of the present application is shown;

[0025] Figure 3 Shown as Figure 1 Another overall schematic diagram of the expansion kettle shown;

[0026] Figure 4 Shown as Figure 3 An overall schematic diagram of the expansion kettle from another angle is shown.

[0027] Description of reference numerals:

[0028] 100 expansion kettle, 1 kettle main body, 11 top wall, 12 bottom wall, 121 raised part, 121a connecting cavity, 13 side wall, 14 liquid cavity, 141 reinforcing plate, 15 second inlet pipe, 16 second outlet pipe, 17 first kettle body, 171 first cavity, 18 second kettle body, 181 second cavity, 19 flange, 2 fluid separation part, 21 main unit, 22 separation cavity, 23 first inlet pipe, 24 first outlet pipe, 25 guide unit, 251 guide cavity, 26 reinforcing rib, 3 cover body, 4 connecting piece, 5 liquid level sensor, 6 avoidance recess, Z first direction. DETAILED DESCRIPTION

[0029] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The methods described in the following exemplary embodiments do not represent all methods consistent with the present application. Instead, they are merely examples of devices consistent with some aspects of the present application as detailed in the appended claims.

[0030] The terms used in this application are only for the purpose of describing specific embodiments and are not intended to limit this application. Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not indicate a quantitative limit, but indicate that there is at least one, and if only "one" is referred to, it will be separately described. "Multiple" or "several" means two or more. Unless otherwise specified, similar words such as "front", "rear", "lower" and / or "upper" are only for the convenience of explanation, and are not limited to one position or one spatial orientation. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect. The singular forms "a", "said" and "the" used in this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0031] The present application provides a thermal management system. The thermal management system includes a motor, a battery, and an expansion kettle. The motor and the expansion kettle are connected by a pipeline to form a motor cooling circuit. The battery and the expansion kettle are connected by a pipeline to form a battery cooling circuit. The battery cooling circuit and the motor cooling circuit are connected in series, or at least can be switched between parallel and series connection by a reversing valve.

[0032] It should be understood that the connection referred to in this application can be a direct connection or an indirect connection. For example, the motor and the expansion kettle are connected to form a motor cooling circuit, which means that the motor and the expansion kettle are directly connected through a pipeline, or other thermal management components such as an evaporator and a heat exchanger are also provided between the motor and the expansion kettle, and are indirectly connected through a pipeline.

[0033] refer to Figures 1 to 4 The expansion kettle 100 of the present application includes a kettle main body 1 and a fluid separation part 2. The kettle main body 1 includes a top wall 11, a bottom wall 12 and a side wall 13. The top wall 11, the side wall 13 and the bottom wall 12 surround a liquid chamber 14. The fluid separation part 2 includes a main unit 21 arranged on the bottom wall 12. The main unit 21 is provided with a separation chamber 22. The main unit 21 is connected to the bottom wall 12. The separation chamber 22 is connected to the liquid chamber 14. The fluid separation part 2 also includes a first inlet pipe 23 and a first outlet pipe 24 respectively connected to the separation chamber 22. The kettle main body 1 includes a second inlet pipe 15 and a second outlet pipe 16 connected to the liquid chamber 14.

[0034] For the sake of simplicity, the first direction Z is set as a reference direction in the drawings. In addition, in the viewing angle shown in the drawings, the first direction Z is downward, which is the direction of gravity.

[0035] The top wall 11 and the bottom wall 12 are distributed along the first direction X. The first inlet pipe 23 and the first outlet pipe 24 are respectively disposed on the main unit 21 . In the first direction Z, the first outlet pipe 24 is located between the first inlet pipe 23 and the bottom wall 12 .

[0036] The following description will be made by taking the battery cooling circuit connected to the fluid separation part 2 and the motor cooling circuit connected to the kettle main body 1 as an example. However, it should be understood that the thermal management system may also be such that the motor cooling circuit is connected to the fluid separation part 2 and the battery cooling circuit is connected to the kettle main body 1.

[0037] The motor is connected to the kettle body 1 through the second inlet pipe 15 and the second outlet pipe 16, so that the coolant in the motor cooling circuit can enter the liquid chamber 14. The battery is connected to the expansion kettle 100 through the first inlet pipe 23 and the first outlet pipe 24, so that the coolant in the battery cooling circuit can enter the separation chamber 22 through the first inlet pipe 23. Since the first outlet pipe 24 is arranged closer to the bottom wall 12 relative to the first inlet pipe 23, the coolant needs to be Figure 2 After the separation chamber 22 is filled upward in the first direction Z of the viewing angle shown, the coolant can leave the separation chamber 22 from the first outlet pipe 24. Due to the different densities of gas and liquid, the gas in the separation chamber 22 will enter the liquid chamber 14 from the separation chamber 22, thereby achieving separation of gas and liquid in the fluid separation part 2, reducing the gas in the fluid leaving the separation chamber 22 from the first outlet pipe 24, and achieving degassing of the coolant in the battery cooling circuit.

[0038] After the coolant in the battery cooling circuit circulates multiple times, the bubbles in the coolant are eliminated through the fluid separation part 2. Since the gas overflow in the separation chamber 22 is reduced, the fluid exchange between the separation chamber 22 and the liquid chamber 14 is reduced, thereby reducing the heat exchange between the coolant in the separation chamber 22 and the coolant in the liquid chamber 14. In addition, the first outlet pipe 24 is also provided in the fluid separation part 2, so the coolant flow of the motor cooling circuit does not need to pass through the liquid chamber 14. In this way, the coolant of the motor cooling circuit flows through the expansion kettle 100 via the second inlet pipe 15, the liquid chamber 14 and the second outlet pipe 16, and the coolant of the battery cooling circuit flows through the expansion kettle 100 via the first inlet pipe 23, the separation chamber 22 and the first outlet pipe 24. It can be seen that the expansion kettle 100 of the present application can achieve the isolation of the coolant of the battery cooling circuit and the coolant of the motor cooling circuit, and avoid the heat exchange of the coolants of the two circuits.

[0039] It can be seen that the expansion kettle 100 of the present application enables the battery cooling circuit to be independent to a certain extent, avoiding heat loss or heat gain of the battery coolant, thereby ensuring the cooling or heating efficiency of the battery. At the same time, since the main unit 21 of the fluid separation part 2 is directly connected to the bottom wall 12 of the kettle main body 1, compared with the technical solution connected by pipeline, the volume of the expansion kettle 100 of the present application is further reduced, which is conducive to optimizing the overall size of the thermal management system.

[0040] It should be noted that the fluid separation part 2 is arranged on the bottom wall 12, which should be understood as the fluid separation part 2 being connected to the side of the kettle body 1 away from the top wall 11 in the first direction Z. In other words, the bottom wall 12 may be a non-planar wall structure. Figure 2 As shown, the bottom wall 12 includes a raised portion 121 。 The main body unit 21 is connected to the protrusion 121, so as to facilitate the assembly of the fluid separation unit 2 and the kettle main body 1. However, this should be taken as an example and not a limitation. The fluid separation unit 2 can also be connected to the bottom wall 12 at a plane position of the bottom wall 12, and the present application does not limit this.

[0041] In an optional embodiment, the bottom wall 12 is fixedly connected to the main body unit 21. For example, it can be achieved by welding, bonding, etc. Since coolant flows in the expansion kettle 100, compared with the detachable connection, the fixed connection method can improve the fluid sealing performance between the kettle main body 1 and the fluid separation part 2, and prevent the fluid from leaking from the connection gap between the kettle main body 1 and the fluid separation part 2.

[0042] In an optional embodiment, the fluid separation part 2 includes a reinforcing rib 26. The reinforcing rib 26 is arranged on one side of the fluid separation part 2 close to the bottom wall 12. The reinforcing rib 26 extends along the direction in which the fluid separation part 2 is connected to the kettle body 1. By providing the reinforcing rib 26, the structural strength of the fluid separation part 2 at the connection position with the kettle body 1 is improved. In this way, the structural strength and fluid sealing performance of the expansion kettle 100 can be further guaranteed.

[0043] refer to Figure 2 and Figure 3 In one embodiment, the second inlet pipe 15 is arranged near the top wall 11. The second outlet pipe 16 is arranged near the bottom wall 12. The motor is connected to the expansion kettle 100 through the second inlet pipe 15 and the second outlet pipe 16, so that the coolant of the motor cooling circuit can enter the liquid chamber 14 through the second inlet pipe 15, and then leave the liquid chamber 14 through the second outlet pipe 16. By arranging the second inlet pipe 15 near the top wall 11 and the second outlet pipe 16 near the bottom wall 12, when the coolant flows into the liquid chamber 14 from the second inlet pipe 15, the liquid part of the coolant mixed with bubbles moves downward in the first direction Z under the action of gravity, while the bubbles move upward in the first direction Z. In this way, the bubbles in the coolant leaving the liquid chamber 14 from the second outlet pipe 16 near the bottom wall 12 can be reduced, further improving the degassing capacity of the expansion kettle 100.

[0044] In an optional embodiment, the kettle body 1 includes a first kettle body 17 and a second kettle body 18. The top wall 11 is arranged on the first kettle body 17. The bottom wall 12 is arranged on the second kettle body 18. The first kettle body 17 is provided with a first cavity 171. The second kettle body 18 is provided with a second cavity 181. The first kettle body 17 and the second kettle body 18 are fixedly connected so that the first cavity 171 and the second cavity 181 enclose a liquid cavity 14. Setting the kettle body 1 as a combination of the first kettle body 17 and the second kettle body 18 can reduce the difficulty of processing the kettle body 1. Specifically, the first kettle body 17 and the second kettle body 18 can be processed in a mold respectively, and then the first kettle body 17 and the second kettle body 18 are connected by welding or the like. Compared with the technical solution of integrally casting the kettle body 1, this embodiment can reduce the difficulty of removing the first kettle body 17 and the second kettle body 18 from the mold and improve the yield rate of the kettle body 1.

[0045] As shown in the figure, the first kettle body 17 and the second kettle body 18 can be provided with flanges 19 at the connection positions. The provision of the flanges 19 facilitates the welding operation of the first kettle body 17 and the second kettle body 18. At the same time, after the first kettle body 17 and the second kettle body 18 are connected, the flanges 19 can also play a role of abutment with other components such as the thermal management system to achieve fixed connection.

[0046] like Figure 2 As shown, a plurality of reinforcing plates 141 are provided in the liquid cavity 14. The provision of the reinforcing plates 141 can improve the overall structural strength of the kettle body 1, so as to prevent the kettle body 1 from being dented, deformed, or damaged when an external force impacts the expansion kettle 100.

[0047] Combination Figure 2 and Figure 3 In one embodiment, the separation chamber 22 is configured as a cylindrical chamber. The first inlet pipe 23 is connected to the separation chamber 22 along the tangent direction of the cylindrical chamber. By configuring in this way, the fluid entering the separation chamber 22 from the first inlet pipe 23 can form a spiral upward flow trajectory in the separation chamber 22, and then leave through the first outlet pipe 24. The spiral upward flow trajectory can further improve the fluid separation effect of gas and liquid, reduce the time for the cooling circuit to completely remove gas, and improve the degassing efficiency.

[0048] The first inlet pipe 23 may be connected to the separation chamber 22 on the side of the main unit 21 away from the bottom wall 12. In another embodiment, the fluid separation part 2 may include a guide unit 25 arranged on the side of the main unit 21 away from the bottom wall 12. The guide unit 25 is provided with a guide chamber 251 connected to the separation chamber 22. The guide chamber 251 is arranged in a spiral shape extending toward the main unit 21 around the axis of the separation chamber 22. The first inlet pipe 23 is arranged in the guide unit 25. In other words, the first inlet pipe 23 of this embodiment is indirectly connected to the separation chamber 22 through the guide chamber 251. In this embodiment, the first inlet pipe 23 enters the guide chamber 251 along the tangent direction of the cylindrical cavity, and then flows in a spiral ascending trajectory under the guidance of the spiral cavity of the guide chamber 251. The setting of the guide chamber 251 can further guide the spiral flow of the fluid, thereby ensuring the fluid separation effect of the fluid separation part 2.

[0049] It is easy to understand that the increase in the number of spiral turns of the guide cavity 251 will, to a first extent, lead to a decrease in the flow volume of the guide cavity 251. Therefore, the number of spiral turns of the guide cavity 251 may be less than one turn, such as half a turn, two-thirds of a turn, etc. Of course, in order to improve the guiding effect of the guide cavity 251, the number of spiral turns of the guide cavity 251 may be greater than or equal to one turn, and the present application does not limit this.

[0050] Further, in an optional embodiment, the wall thickness of the fluid separation part 2 is uniform. The uniform wall thickness of the fluid separation part 2 can avoid the stress concentration problem caused by uneven wall thickness, and can also improve the yield rate during molding and demolding of the fluid separation part 2. It should be noted that the uniform wall thickness should be understood as the wall thickness of the fluid separation part 2 being basically the same, and the wall thickness transition being continuous at the place where the wall thickness changes, rather than the wall thickness being absolutely the same.

[0051] refer to Figure 2In an embodiment in which the bottom wall 12 includes a protrusion 121 and the main body unit 21 is connected to the protrusion 121, a connecting cavity 121a is provided on the protrusion 121. The connecting cavity 121a connects the separation cavity 22 and the liquid cavity 14. In which, in the direction in which the main body unit 21 points to the kettle main body 1, the flow area of ​​the connecting cavity 121a gradually decreases. The direction in which the main body unit 21 points to the kettle main body 1 is the upward direction of the first direction Z. When the gas overflows, the gas moves upward along the first direction Z. The gradual reduction in the flow area of ​​the connecting cavity 121a can prevent the gas from remaining on the wall of the connecting cavity 121a and being unable to continue to move upward. In addition, the flow area at the connection position between the connecting chamber 121a and the liquid chamber 14 is the smallest. Therefore, when the gas in the battery cooling circuit is completely removed, even if the coolant fills the separation chamber 22 and the connecting chamber 121a, the heat exchange area between the fluid in the connecting chamber 121a and the fluid in the liquid chamber 14 at the connecting chamber 121a can be controlled, which is beneficial to reducing the influence of the coolant temperature of the motor cooling circuit on the coolant temperature of the battery cooling circuit when the motor cooling circuit and the battery cooling circuit share the expansion kettle 100, thereby realizing the relative independence of the battery cooling circuit.

[0052] The expansion kettle 100 of the present application also includes a cover body 3. The kettle main body 1 is provided with an opening on the top wall 11. The cover body 3 is detachably connected to the top, thereby closing the opening or exposing the opening. The provision of the opening allows personnel to add coolant to the liquid chamber 14, thereby enabling the coolant to be added when the coolant in the thermal management system is insufficient. In some implementations, the cover body 3 is provided as a pressure relief cover. Since the fluid will produce a change in pressure when the fluid temperature changes, the provision of the pressure relief cover can release the pressure when the pressure in the liquid chamber 14 is too high, thereby avoiding damage to the expansion kettle 100 caused by excessive pressure.

[0053] In addition, the kettle body 1 may be provided with an avoidance recess 6. The setting of the avoidance recess 6 can avoid interference between the expansion kettle 100 and other thermal management components, increase the arrangement density of the thermal management components in the thermal management system, and thus optimize the overall volume of the thermal management system.

[0054] Based on the above description of the expansion kettle 100 and the various embodiments of the thermal management system, the present application also provides a vehicle. The vehicle includes the thermal management system described above. The expansion kettle 100 of the thermal management system enables the battery cooling circuit of the vehicle to be independent to a certain extent, avoiding heat loss or heat gain of the battery coolant, thereby ensuring the battery cooling or heating efficiency and reducing the energy consumption of the vehicle. At the same time, since the main unit 21 of the fluid separation part 2 is directly connected to the bottom wall 12 of the kettle main body 1, compared with the technical solution connected by a pipeline, the volume of the expansion kettle 100 of the present application is further reduced, which is conducive to optimizing the overall size of the thermal management system. In this way, the space vacated by the thermal management system allows the vehicle to be provided with components such as motors and batteries with good performance and large size, which is conducive to optimizing the performance of the vehicle. Alternatively, the space vacated by the thermal management system also allows the vehicle to be provided with a larger storage compartment, thereby improving the vehicle's storage capacity.

[0055] In some embodiments, the expansion kettle 100 may further include a liquid level sensor 5. The liquid level sensor 5 is used to sense the liquid height in the liquid chamber 14. When the liquid height is lower than a threshold, the liquid level sensor 5 sends a low liquid level signal to the vehicle, thereby reminding the vehicle user to add coolant to the expansion kettle 100.

[0056] In order to facilitate the connection between the expansion kettle 100 and the vehicle frame, the expansion kettle 100 may further include a connector 4. The connector 4 may be disposed on the top wall 11, the side wall 13 or the bottom wall 12 of the kettle body 1, and the present application does not limit this.

[0057] The various embodiments herein may be implemented in combination unless there is any conflict.

[0058] The specific embodiments described herein are merely examples of the spirit of the present application. A person skilled in the art of the present application may make various modifications, supplements, or replace the described specific embodiments with similar methods, but they will not deviate from the spirit of the present application or exceed the scope defined by the attached claims.

[0059] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. An expansion kettle, characterized in that: include: The kettle body comprises a top wall, a bottom wall and a side wall, wherein the top wall, the side wall and the bottom wall form a liquid cavity; the top wall and the bottom wall are distributed along a first direction; The kettle body includes a second inlet pipe and a second outlet pipe communicating with the liquid chamber; as well as The fluid separation part comprises a main body unit arranged on the bottom wall, wherein the main body unit is provided with a separation cavity; The separation chamber is in communication with the liquid chamber; Wherein, the fluid separation part also includes a first inlet pipe and a first outlet pipe respectively connected to the separation chamber; the first outlet pipe and the first inlet pipe are respectively arranged in the main unit; the first outlet pipe is located between the first inlet pipe and the bottom wall in the first direction.

2. The expansion kettle according to claim 1, characterized in that: The bottom wall includes a protrusion; the main body unit is connected to the protrusion; the protrusion is provided with a connecting cavity; the connecting cavity connects the separation cavity and the liquid cavity; wherein, in the direction from the main body unit to the main body of the kettle, the flow area of ​​the connecting cavity gradually decreases.

3. The expansion kettle according to claim 1, characterized in that: The separation chamber is configured as a cylindrical chamber; the first inlet pipe is connected to the separation chamber along a tangent direction of the cylindrical chamber.

4. The expansion kettle according to claim 3, characterized in that: The fluid separation part comprises a guide unit arranged on a side of the main body unit away from the bottom wall; the guide unit is provided with a guide cavity communicated with the separation cavity; The guide cavity is configured to be in a spiral shape extending toward the main body unit around the axis of the separation cavity; The first inlet pipe is disposed at the guide unit.

5. The expansion kettle according to claim 1, characterized in that: The fluid separation part includes a reinforcing rib; the reinforcing rib is arranged on a side of the fluid separation part close to the bottom wall; the reinforcing rib extends along the direction in which the fluid separation part and the kettle main body are connected.

6. The expansion kettle according to claim 1, characterized in that The second inlet pipe is arranged close to the top wall; the second outlet pipe is arranged close to the bottom wall.

7. The expansion kettle according to claim 1, characterized in that The kettle main body includes a first kettle body and a second kettle body; the top wall is arranged on the first kettle body; the bottom wall is arranged on the second kettle body; the first kettle body is provided with a first cavity; the second kettle body is provided with a second cavity; the first kettle body and the second kettle body are fixedly connected so that the first cavity and the second cavity enclose the liquid cavity.

8. The expansion kettle according to any one of claims 1 to 7, characterized in that: The bottom wall is fixedly connected to the main unit; and / or, The wall thickness of the fluid separation part is uniform.

9. A thermal management system, characterized in that: It comprises a motor, a battery and the expansion kettle according to any one of claims 1 to 8; the battery is connected to the expansion kettle through the first inlet pipe and the first outlet pipe; The kettle body includes a second inlet pipe and a second outlet pipe communicating with the liquid chamber; the motor is connected to the expansion kettle via the second inlet pipe and the second outlet pipe.

10. A vehicle, characterized in that: Comprising the thermal management system of claim 9.

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