Chassis structure and vehicle

Abstract

The invention provides a chassis structure and a vehicle, and relates to the technical field of new energy. The chassis structure provided by the invention comprises a chassis main body with an opening; a cold plate assembly and a cell stack, the cold plate assembly covers the opening and is fixedly connected with the chassis main body to form an accommodating cavity, and the cell stack is fixedly arranged in the accommodating cavity; the cold plate assembly is provided with a first cavity and a second cavity which are sequentially arranged along the thickness direction of the cold plate assembly, the first cavity is positioned on one side close to the battery cell stack, the first cavity is used for introducing cooling liquid so as to dissipate heat of the battery cell stack, and a thermally induced phase change part is arranged in the second cavity. When the chassis structure is applied to the vehicle, the cold plate assembly serves as a part of the chassis to isolate the battery cell pile and the passenger compartment, and the negative effect of thermal runaway of the battery cell pile on the passenger compartment is reduced.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a chassis structure and a vehicle. Background Art

[0002] The Cell to Chassis (CTC) technology in the new energy industry is a method of installing the battery stack directly on the chassis of the vehicle body, which is conducive to the integrated integration of the vehicle body and the battery system. While ensuring performance, it is suitable for large-scale production. Safety is the biggest requirement of users for new energy vehicles. Only by ensuring the safety of the passengers can users use new energy products with confidence.

[0003] However, in new energy vehicles that use CTC technology, thermal runaway of the battery cells in the vehicle often causes excessive temperatures inside the passenger compartment, which can easily cause a fire in the passenger compartment. Therefore, it is urgent to design a solution to regulate the battery cell temperature and prevent fires in the passenger compartment. Summary of the invention

[0004] The present application provides a chassis structure and a vehicle. When the chassis structure is applied to a vehicle, a cold plate assembly is used as a part of the chassis to isolate a battery stack and a passenger compartment, thereby reducing the negative impact of thermal runaway of the battery stack on the passenger compartment.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of the present application provides a chassis structure, which includes: a chassis body having an opening;

[0007] A cold plate assembly and a battery cell stack, wherein the cold plate assembly cover is arranged on the opening and is fixedly connected to the chassis body to form a receiving cavity, and the battery cell stack is fixedly arranged in the receiving cavity; the cold plate assembly comprises a first cavity and a second cavity which are arranged in sequence along its thickness direction, the first cavity is located on a side close to the battery cell stack, the first cavity is used for passing coolant to dissipate heat for the battery cell stack, and a thermotropic phase change element is arranged in the second cavity.

[0008] In a possible implementation, the cold plate assembly includes a flow channel plate, a liquid inlet plate and a liquid outlet plate, the liquid inlet plate is provided with a first inner cavity, and the liquid inlet plate is provided with a liquid inlet port connected to the first inner cavity;

[0009] The first cavity and the second cavity are provided in the flow channel plate, the second inner cavity is provided in the liquid outlet plate, the liquid outlet plate is provided with a liquid outlet connected to the second inner cavity, and the liquid inlet plate and the liquid outlet plate are respectively fixedly connected to the opposite sides of the flow channel plate to connect the first inner cavity, the first cavity and the second inner cavity.

[0010] In a possible implementation, the liquid inlet plate is provided with a first connection portion, the first connection portion is provided with a first connection hole, the liquid outlet plate is provided with a second connection portion, the second connection portion is provided with a second connection hole, the first connection portion and the second connection portion both protrude toward a side away from the flow channel plate, the chassis body is provided with a first mounting hole and a second mounting hole, the liquid inlet plate and the liquid outlet plate are respectively fixed to the chassis body by a first fastener penetrating through the first connection hole and the first mounting hole, and a second fastener penetrating through the second connection hole and the second mounting hole;

[0011] And / or, the flow channel plate is provided with two third connecting parts, and along the length direction of the flow channel plate, the two third connecting parts are respectively located on opposite sides of the flow channel plate, and the third connecting part is provided with a third connecting hole, and the chassis body is provided with a third mounting hole, and the flow channel plate is fixed to the chassis body by a third fastener penetrating the third connecting hole and the third mounting hole.

[0012] In a possible implementation, the flow channel plate includes a plurality of flow channel sub-plates fixedly connected in sequence, wherein the flow channel sub-plates at both ends are provided with the third connecting portion, and each of the flow channel sub-plates is provided with a first sub-cavity and a second sub-cavity along its own thickness direction, and the plurality of first sub-cavities are connected in sequence to form the first cavity, and the plurality of second sub-cavities are connected in sequence to form the second cavity.

[0013] In a possible implementation, the cold plate assembly further includes a plurality of heat-insulating components, two of which are respectively fixedly connected between the first connection portion and the chassis body, and between the second connection portion and the chassis body;

[0014] And / or, the two thermal insulation components are respectively fixedly connected to the two third connection parts, and each thermal insulation component is located between the third connection part and the chassis body.

[0015] In a possible implementation, the liquid inlet plate is provided with a first convex rib protruding toward one side of the flow channel plate, the first convex rib is provided with a first through hole, the liquid outlet plate is provided with a second convex rib protruding toward one side of the flow channel plate, the second convex rib is provided with a second through hole;

[0016] The flow channel plate has a first snap-in and a second snap-in connected to the first cavity on opposite sides along its width direction, and the first convex rib and the second convex rib are respectively embedded and fixed in the first snap-in and the second snap-in, so that the first through hole and the second through hole are connected to the first cavity.

[0017] In a possible implementation, the cold plate assembly further includes a blocking block, which is sealed between the second cavity of the flow channel plate and the liquid inlet plate, or the blocking block is sealed between the second cavity of the flow channel plate and the liquid outlet plate;

[0018] Alternatively, the cold plate assembly further comprises at least two blocking blocks, and the two blocking blocks are respectively sealed and connected between the second cavity of the flow channel plate and the liquid inlet plate, and between the second cavity of the flow channel plate and the liquid outlet plate.

[0019] In a possible implementation, the cold plate assembly further includes two water nozzles, the two water nozzles are respectively fixed on the liquid inlet and the liquid outlet, and the two water nozzles are respectively connected to the first inner cavity and the second inner cavity.

[0020] In a possible implementation manner, a thermally conductive adhesive is provided between the battery cell stack and the cold plate assembly, and the battery cell stack is bonded to the cold plate assembly through the thermally conductive adhesive.

[0021] The chassis structure provided in the first aspect of the present application includes at least the following beneficial effects:

[0022] The cold plate assembly of the chassis structure is fixedly connected to the chassis body and forms a receiving cavity with the chassis body. The battery stack is fixedly arranged in the receiving cavity. When the chassis structure is used in a vehicle, the cold plate assembly can be used as the floor of the vehicle. It can not only be used as a load-bearing structure of the vehicle body, but also can be used as a cold isolation layer to isolate the battery stack and the passenger compartment, thereby reducing the thermal damage to the passenger compartment when the battery stack thermally runs away. At the same time, the thermotropic phase change component arranged in the second cavity of the cold plate assembly can absorb the heat generated by the overheating of the battery stack to further protect the safety of the passenger compartment.

[0023] A second aspect of the present application provides a vehicle, comprising a chassis structure provided by any one of the above technical solutions.

[0024] The vehicle provided in the second aspect of the present application has all the beneficial effects of the chassis structure provided in the first aspect of the present application, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 An exploded view of the chassis structure provided in an embodiment of the present application;

[0027] Figure 2 for Figure 1 Schematic diagram of the structure after the mid-chassis body and cold plate assembly are assembled;

[0028] Figure 3 for Figure 1 Schematic diagram of the structure of the intercooler plate assembly;

[0029] Figure 4 for Figure 3 Schematic diagram of the internal flow channel of the intercooler plate assembly (the arrows in the figure indicate the flow direction of the coolant);

[0030] Figure 5 for Figure 3 Schematic diagram of the structure of the liquid outlet plate;

[0031] Figure 6 for Figure 3 A schematic cross-sectional view of the intercooler plate assembly;

[0032] Figure 7 To show Figure 1 Partial structural cross-sectional view of the intercooler plate assembly assembled on the chassis body.

[0033] Description of reference numerals:

[0034] 100, chassis body; 110, opening; 120, accommodating cavity; 130, threshold beam; 200, cold plate assembly; 210, first cavity; 220, second cavity; 221, thermal phase change element; 230, flow channel plate; 231, third connecting portion; 2311, third connecting hole; 232, flow channel sub-plate; 240, liquid inlet plate; 241, first inner cavity; 242, first connecting portion; 2421, first connecting hole; 2 43. first convex rib; 2431. first through hole; 250. liquid outlet plate; 251. second inner cavity; 252. second connecting portion; 2521. second connecting hole; 253. second convex rib; 2531. second through hole; 260. thermal insulation component; 270. sealing block; 280. faucet; 300. battery cell stack; 310. thermal conductive adhesive; 400. seat beam; 500. adhesive limit strip; 600. first fastener; 700. plug.

[0035] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] As described in the background technology, the cell to chassis (CTC) technology in the new energy industry is a method of directly installing the battery stack on the chassis of the vehicle body, which is conducive to the integrated integration of the vehicle body and the battery system. While ensuring performance, it is suitable for large-scale production. Safety is the biggest requirement of users for new energy vehicles. Only by ensuring the safety of the passengers can users use new energy products with confidence.

[0037] However, in new energy vehicles that use CTC technology, thermal runaway of the battery cells in the vehicle often causes excessive temperatures inside the passenger compartment, which can easily cause a fire in the passenger compartment. Therefore, it is urgent to design a solution to regulate the battery cell temperature and prevent fires in the passenger compartment.

[0038] In response to the above technical problems, an embodiment of the present application provides a chassis structure and a vehicle, wherein a cold plate assembly of the chassis structure is fixedly connected to a chassis body and forms a receiving cavity with the chassis body, in which a battery cell stack is fixedly arranged. When the chassis structure is used in a vehicle, the cold plate assembly can be used as the floor of the vehicle, which can not only be used as a load-bearing structure of the vehicle body, but also can be used as a cold isolation layer to isolate the battery cell stack from the passenger compartment, thereby reducing thermal damage to the passenger compartment when the battery cell stack suffers from thermal runaway. At the same time, the thermotropic phase change component arranged in the second cavity of the cold plate assembly can absorb the heat generated by overheating of the battery cell stack, thereby further protecting the safety of the passenger compartment.

[0039] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of this application.

[0040] refer to Figures 1 to 7The chassis structure provided by the embodiment of the present application includes: a chassis body 100 having an opening 110; a cold plate assembly 200 and a battery stack 300, wherein the cold plate assembly 200 covers the opening 110 and is fixedly connected to the chassis body 100 to form a receiving cavity 120, and the battery stack 300 is fixedly arranged in the receiving cavity 120, and the opening 110 of the receiving cavity 120 is downward, so that the battery stack 300 can be installed from one side of the bottom of the chassis body 100 and fit on the cold plate assembly 200; The plate assembly 200 has a first cavity 210 and a second cavity 220 which are arranged in sequence along its thickness direction. The first cavity 210 is located on a side close to the battery cell stack 300. The first cavity 210 is used to be passed with coolant to dissipate heat from the battery cell stack 300. A thermotropic phase change element 221 is provided in the second cavity 220. Furthermore, the phase change material of the thermotropic phase change element 221 is a solid-liquid phase change material, such as paraffin materials, fatty acids, inorganic hydrated salts or metal materials of gallium and its alloys.

[0041] In this way, the cold plate assembly 200 of the chassis structure is fixedly connected to the chassis body 100, and forms a accommodating cavity 120 with the chassis body 100, and the battery stack 300 is fixedly arranged in the accommodating cavity 120. When the chassis structure is used in a vehicle, the cold plate assembly 200 can be used as the floor of the vehicle, not only as a load-bearing structure of the vehicle body, but also as a cold isolation layer to isolate the battery stack 300 and the passenger compartment, thereby reducing the thermal damage to the passenger compartment when the battery stack 300 thermally runs away. At the same time, the thermotropic phase change element 221 arranged in the second cavity 220 of the cold plate assembly 200 can absorb the heat generated by the overheating of the battery stack 300 to further protect the safety of the passenger compartment. That is, the chassis structure of this embodiment realizes thermal protection of the passenger compartment by setting a double-layer cavity, one layer as a cold source insulation layer, and the other layer as a heat absorption reinforcement layer.

[0042] Exemplarily, the chassis body 100 includes a front crossbeam and a rear crossbeam connected by two sill beams 130 . The front crossbeam, the two sill beams 130 and the rear crossbeam together form an opening 110 , and together with the cold plate assembly 200 form a receiving cavity 120 .

[0043] In some embodiments, the cold plate assembly 200 includes a flow channel plate 230, a liquid inlet plate 240 and a liquid outlet plate 250. The liquid inlet plate 240 is provided with a first inner cavity 241, and the liquid inlet plate 240 is provided with a liquid inlet connected to the first inner cavity 241; the flow channel plate 230 is provided with a first cavity 210 and a second cavity 220, the liquid outlet plate 250 is provided with a second inner cavity 251, and the liquid outlet plate 250 is provided with a liquid outlet connected to the second inner cavity 251. The liquid inlet plate 240 and the liquid outlet plate 250 are respectively fixedly connected to the opposite sides of the flow channel plate 230 to connect the first inner cavity 241, the first cavity 210 and the second inner cavity 251.

[0044] In this embodiment, the material of the flow channel plate 230, the liquid inlet plate 240 and the liquid outlet plate 250 can all be aluminum profiles, which have good structural strength and achieve lightweight structure.

[0045] In more examples, along the length direction of the chassis body 100 , plugs are sealed and connected on both sides of the first cavity 210 of the flow channel plate 230 to ensure the sealing performance of both sides of the flow channel plate 230 .

[0046] In some embodiments, a first connecting portion 242 is provided on the liquid inlet plate 240, a first connecting hole 2421 is provided on the first connecting portion 242, a second connecting portion 252 is provided on the liquid outlet plate 250, a second connecting portion 252 is provided on the second connecting portion 252, both the first connecting portion 242 and the second connecting portion 252 protrude toward the side away from the flow channel plate 230, a first mounting hole and a second mounting hole are provided on the chassis body 100, and the liquid inlet plate 240 and the liquid outlet plate 250 are respectively fixed to the chassis body 100 by a first fastener 600 penetrated through the first connecting hole 2421 and the first mounting hole, and a second fastener penetrated through the second connecting hole 2521 and the second mounting hole.

[0047] And / or, two third connecting parts 231 are provided on the flow channel plate 230, and along the plate length direction of the flow channel plate 230, the two third connecting parts 231 are respectively located on the opposite sides of the flow channel plate 230, and a third connecting hole 2311 is provided on the third connecting part 231, and the chassis body 100 is provided with a third mounting hole, and the flow channel plate 230 is fixed to the chassis body 100 by a third fastener passing through the third connecting hole 2311 and the third mounting hole.

[0048] In this way, the heat insulation member 260 can effectively isolate the heat transfer between the cold plate assembly 200 and the chassis body 100 , thereby ensuring the heat insulation effect on one side of the battery cell stack 300 .

[0049] Specifically, the bottom and sides of the first connection part 242, the second connection part 252 and the third connection part 231 are wrapped by the thermal insulation part 260. Further, the thermal conductivity of the thermal insulation part 260 is less than or equal to 0.3W / mk. For example, the thermal conductivity of the thermal insulation part 260 is 0.25W / mk.

[0050] In more examples, the chassis structure further includes a seat beam 400 , which is fixedly mounted on a side of the cold plate assembly 200 facing away from the battery cell stack 300 .

[0051] In some embodiments, the flow channel plate 230 includes a plurality of flow channel sub-plates 232 fixedly connected in sequence, wherein the flow channel sub-plates 232 located at both ends are provided with a third connecting portion 231, and each flow channel sub-plate 232 is provided with a first sub-cavity and a second sub-cavity along its own thickness direction. The plurality of first sub-cavities are connected in sequence to form a first cavity 210, and the plurality of second sub-cavities are connected in sequence to form a second cavity 220. Further, the plurality of flow channel sub-plates 232 are spliced ​​and welded together in sequence, and the flow channel sub-plates 232 located at the head and tail ends are provided with a third connecting portion 231.

[0052] In some embodiments, the cold plate assembly 200 further includes a plurality of thermal insulation components 260, two thermal insulation components 260 being respectively fixedly connected between the first connection portion 242 and the chassis body 100, and between the second connection portion 252 and the chassis body 100; and / or, two thermal insulation components 260 are respectively fixedly connected to two third connection portions 231, and each thermal insulation component 260 is located between the third connection portion 231 and the chassis body 100.

[0053] In some embodiments, the liquid inlet plate 240 is provided with a first rib 243 protruding toward one side of the flow channel plate 230, and the first rib 243 is provided with a first through hole 2431, and the liquid outlet plate 250 is provided with a second rib 253 protruding toward one side of the flow channel plate 230, and the second rib 253 is provided with a second through hole 2531.

[0054] The flow channel plate 230 has a first snap-in and a second snap-in connected to the first cavity 210 on opposite sides along its own width direction. The first rib 243 and the second rib 253 are respectively embedded and fixed in the first snap-in and the second snap-in, so that the first through hole 2431 and the second through hole 2531 are both connected to the first cavity 210. Furthermore, the first rib 243 and the second rib 253 are respectively welded and fixed in the first snap-in and the second snap-in.

[0055] That is, along the width direction of the chassis body 100 , the liquid inlet plate 240 and the liquid outlet plate 250 are respectively spliced ​​and fixed on opposite sides of the flow channel plate 230 , thereby ensuring the stability of the coolant channel of the cold plate assembly 200 .

[0056] In some embodiments, the cold plate assembly 200 further includes a blocking block 270 , which is sealed between the second cavity 220 of the flow channel plate 230 and the liquid inlet plate 240 , or the blocking block 270 is sealed between the second cavity 220 of the flow channel plate 230 and the liquid outlet plate 250 .

[0057] Alternatively, at least two blocking blocks 270 are further included, and the two blocking blocks 270 are respectively sealed and connected between the second cavity 220 of the flow channel plate 230 and the liquid inlet plate 240 , and between the second cavity 220 of the flow channel plate 230 and the liquid outlet plate 250 .

[0058] In some embodiments, the cold plate assembly 200 further includes two water nozzles 280 , which are respectively fixed on the liquid inlet and the liquid outlet, and the two water nozzles 280 are respectively connected to the first inner cavity 241 and the second inner cavity 251 .

[0059] In some embodiments, a thermally conductive adhesive 310 is disposed between the battery cell stack 300 and the cold plate assembly 200 , and the battery cell stack 300 is bonded to the cold plate assembly 200 through the thermally conductive adhesive 310 . The thermally conductive adhesive 310 can effectively transfer heat between the battery cell stack 300 and the cold plate assembly 200 .

[0060] Furthermore, a limiting rubber strip 500 is fixedly provided on the top surface of the cell stack 300 facing the cold plate assembly 200 , and two limiting rubber strips 500 are arranged on opposite sides of the top surface of the cell stack 300 , thereby better limiting the thickness of the thermal conductive adhesive 310 .

[0061] In a second aspect, an embodiment of the present application provides a vehicle, which includes the chassis structure provided by any embodiment of the first aspect. The vehicle can be an electric vehicle / equipment (Electric Vehicle, referred to as EV), a pure electric vehicle equipment (Pure Electric Vehicle / Battery Electric Vehicle, referred to as PEV / BEV), a hybrid electric vehicle (Hybrid Electric Vehicle, referred to as HEV), an extended-range equipment (Range Extended Electric Vehicle, referred to as REEV), a plug-in hybrid electric vehicle (Plug-in Hybrid Electric Vehicle, referred to as PHEV), and a new energy vehicle (New Energy Vehicle).

[0062] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0063] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0064] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0067] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A chassis structure, characterized in that: include: A chassis body (100) having an opening (110); A cold plate assembly (200) and a battery stack (300), wherein the cold plate assembly (200) is covered on the opening (110) and fixedly connected to the chassis body (100) to form a receiving cavity (120), and the battery stack (300) is fixedly arranged in the receiving cavity (120); the cold plate assembly (200) has a first cavity (210) and a second cavity (220) which are arranged in sequence along its thickness direction, the first cavity (210) being located on a side close to the battery stack (300), the first cavity (210) being used to be passed with a coolant to dissipate heat from the battery stack (300), and a thermotropic phase change element (221) being arranged in the second cavity (220).

2. The chassis structure according to claim 1, characterized in that: The cold plate assembly (200) comprises a flow channel plate (230), a liquid inlet plate (240) and a liquid outlet plate (250); a first inner cavity (241) is provided in the liquid inlet plate (240); and a liquid inlet port connected to the first inner cavity (241) is provided on the liquid inlet plate (240); The flow channel plate (230) is provided with the first cavity (210) and the second cavity (220), the liquid outlet plate (250) is provided with a second inner cavity (251), the liquid outlet plate (250) is provided with a liquid outlet connected to the second inner cavity (251), and the liquid inlet plate (240) and the liquid outlet plate (250) are respectively fixedly connected to opposite sides of the flow channel plate (230) so that the first inner cavity (241), the first cavity (210) and the second inner cavity (251) are connected.

3. The chassis structure according to claim 2, characterized in that: The liquid inlet plate (240) is provided with a first connecting portion (242), the first connecting portion (242) is provided with a first connecting hole (2421), the liquid outlet plate (250) is provided with a second connecting portion (252), the second connecting portion (252) is provided with a second connecting hole (2521), the first connecting portion (242) and the second connecting portion (252) both protrude toward a side away from the flow channel plate (230), the chassis body (100) is provided with a first mounting hole and a second mounting hole, the liquid inlet plate (240) and the liquid outlet plate (250) are respectively fixed to the chassis body (100) by means of a first fastener (600) penetrating the first connecting hole (2421) and the first mounting hole, and a second fastener penetrating the second connecting hole (2521) and the second mounting hole; And / or, the flow channel plate (230) is provided with two third connection parts (231), along the plate length direction of the flow channel plate (230), the two third connection parts (231) are respectively located on opposite sides of the flow channel plate (230), the third connection part (231) is provided with a third connection hole (2311), the chassis body (100) is provided with a third mounting hole, and the flow channel plate (230) is fixed to the chassis body (100) by a third fastener penetrating the third connection hole (2311) and the third mounting hole.

4. The chassis structure according to claim 3, characterized in that: The flow channel plate (230) comprises a plurality of flow channel sub-plates (232) fixedly connected in sequence, wherein the flow channel sub-plates (232) located at both ends are provided with the third connecting portion (231), and each of the flow channel sub-plates (232) is provided with a first sub-cavity and a second sub-cavity along its own thickness direction, and the plurality of first sub-cavities are connected in sequence to form the first cavity (210), and the plurality of second sub-cavities are connected in sequence to form the second cavity (220).

5. The chassis structure according to claim 3, characterized in that: The cold plate assembly (200) further comprises a plurality of heat-insulating components (260), wherein two of the heat-insulating components (260) are respectively fixedly connected between the first connecting portion (242) and the chassis body (100), and between the second connecting portion (252) and the chassis body (100); And / or, the two thermal insulation components (260) are respectively fixedly connected to the two third connection parts (231), and each thermal insulation component (260) is located between the third connection part (231) and the chassis body (100).

6. The chassis structure according to any one of claims 2 to 5, characterized in that: The liquid inlet plate (240) is provided with a first convex rib (243) protruding toward one side of the flow channel plate (230), and the first convex rib (243) is provided with a first through hole (2431); the liquid outlet plate (250) is provided with a second convex rib (253) protruding toward one side of the flow channel plate (230), and the second convex rib (253) is provided with a second through hole (2531); The flow channel plate (230) has a first snap-in and a second snap-in connected to the first cavity (210) on opposite sides along its width direction, and the first convex rib (243) and the second convex rib (253) are respectively embedded and fixed in the first snap-in and the second snap-in, so that the first through hole (2431) and the second through hole (2531) are both connected to the first cavity (210).

7. The chassis structure according to any one of claims 2 to 5, characterized in that: The cold plate assembly (200) further comprises a blocking block (270), wherein the blocking block (270) is sealed between the second cavity (220) of the flow channel plate (230) and the liquid inlet plate (240), or the blocking block (270) is sealed between the second cavity (220) of the flow channel plate (230) and the liquid outlet plate (250); Alternatively, the cold plate assembly (200) further includes at least two sealing blocks (270), and the two sealing blocks (270) are respectively sealed and connected between the second cavity (220) of the flow channel plate (230) and the liquid inlet plate (240), and between the second cavity (220) of the flow channel plate (230) and the liquid outlet plate (250).

8. The chassis structure according to any one of claims 2 to 5, characterized in that: The cold plate assembly (200) further comprises two water nozzles (280), the two water nozzles (280) being respectively fixed on the liquid inlet and the liquid outlet, and the two water nozzles (280) being respectively connected to the first inner cavity (241) and the second inner cavity (251).

9. The chassis structure according to any one of claims 1 to 5, characterized in that: A heat-conducting adhesive (310) is provided between the battery cell stack (300) and the cold plate assembly (200), and the battery cell stack (300) is bonded to the cold plate assembly (200) via the heat-conducting adhesive (310).

10. A vehicle, characterized in that: Comprising a chassis structure as described in any one of claims 1-9.

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