Connecting device, battery pack cooling system and vehicle

Abstract

The utility model relates to the technical field of connecting devices, particularly provides a connecting device, a battery pack cooling system and a vehicle, and aims to solve the problem that the existing connecting device is easy to generate eddy current to increase circulation resistance. Therefore, according to the connecting device, when one of the first connecting pipe and the second connecting pipe abuts against the blocking part, in a preset area of the connecting position of the first intercepting mechanism and the second intercepting mechanism, the specific value of the circulation areas of any two radial sections is larger than or equal to a first preset value and smaller than or equal to a second preset value. The specific value of any two radial cross-sectional areas at the joint is controlled within the preset range, so that the joint is not suddenly reduced, and the circulation resistance is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of connection devices, and specifically provides a connection device, a battery pack cooling system and a vehicle. Background Art

[0002] The cooling system of the vehicle battery pack includes a water pipe and a quick-change connection device. The water pipe is usually divided into two parts, one part is located near the battery pack, and the other part is located in other locations of the vehicle (outside the battery pack installation location). The water pipe flows through the battery pack to absorb heat, and then returns to the pipes in other locations of the vehicle to dissipate heat and cool down. Then it flows back to the pipes near the battery pack to cool the battery pack through the flowing cooling liquid. In order to facilitate the assembly of the whole vehicle, the water pipe near the battery pack is installed to the bottom of the vehicle together with the battery pack, and a quick-change connection device is used to connect the two parts of the pipe. The quick-change connection device generally includes a vehicle-end connection device fixedly connected to the bottom of the vehicle and a pack-end connection device fixedly connected to the battery pack.

[0003] In the prior art, when the connecting pipe of the vehicle-end connecting device and the connecting pipe of the package-end connecting device are connected, the valve core springs inside the two are often deformed, causing the component of the closed interface to move, and then opening the interface, so that the two parts of the interface are connected. However, there is an obvious diameter change in the size of the connection point, which will make the flow resistance relatively large. If there is a sudden expansion and contraction of the cross-sectional area in the flow channel, causing the flow rate to change, the kinetic energy of the fluid is converted into static pressure, resulting in a pressure difference. Even if the original flow rate is restored later, vortexes will be generated when the flow rate changes, thereby increasing the resistance.

[0004] Accordingly, this field requires a new technical solution to solve the above problems. Utility Model Content

[0005] The utility model aims to solve the above technical problem, that is, to solve the problem that the existing connection device is prone to generate eddy currents and increase the flow resistance.

[0006] In a first aspect, the utility model provides a connecting device, which includes: a first connecting pipe, a second connecting pipe, a first shut-off mechanism and a second shut-off mechanism; the first shut-off mechanism is arranged in the first connecting pipe, and the second shut-off mechanism is arranged in the second connecting pipe; one of the first connecting pipe and the second connecting pipe is provided with a blocking portion, and the other of the first connecting pipe and the second connecting pipe abuts against the blocking portion; when the first shut-off mechanism and the second shut-off mechanism are subjected to external force contact, the first connecting pipe and the second connecting pipe can be connected; when one of the first connecting pipe and the second connecting pipe abuts against the blocking portion, in the connection area of ​​the first shut-off mechanism and the second shut-off mechanism, the ratio of the flow area of ​​any two radial cross sections is greater than or equal to a first preset value and less than or equal to a second preset value.

[0007] In the preferred technical solution of the above-mentioned connecting device, when one of the first connecting tube and the second connecting tube abuts against the blocking portion, the ratio of the flow areas of any two radial cross sections in at least three preset positions in the connecting area is greater than or equal to the first preset value and less than or equal to the second preset value.

[0008] In the preferred technical solution of the above-mentioned connecting device, the first shut-off mechanism includes a first valve core, a second elastic member and a movable sleeve, the first valve core and the first connecting tube are fixedly connected, and the outer wall of the movable sleeve is in contact with the inner wall of the first connecting tube; the first end of the second elastic member is connected to the movable sleeve, and the second end of the second elastic member is connected to the first connecting tube, and the movable sleeve can move in the axial direction of the first connecting tube.

[0009] In the preferred technical solution of the above-mentioned connecting device, the second shut-off mechanism includes: a second valve core and a third elastic member, the first end of the third elastic member is connected to the second valve core, the second end of the third elastic member is connected to the second connecting tube, the second connecting tube extends into the first connecting tube, the first connecting tube abuts against the movable sleeve, and the first valve core abuts against the second valve core.

[0010] In a preferred technical solution of the above-mentioned connecting device, the movable sleeve has a first port, the first valve core has a first shut-off portion, the first shut-off portion can control the communication state of the first port, and the second valve core has a second shut-off portion, the second shut-off portion can control the communication state of the second connecting pipe.

[0011] When one of the first connecting tube and the second connecting tube abuts against the blocking portion, the first shut-off portion breaks away from the first mouth and extends into the second connecting tube. The first mouth is at a first preset position, the first shut-off portion is at a second preset position, and the second shut-off portion is at a third preset position. The ratio of the flow areas of any two radial cross sections in the first preset position, the second preset position, and the third preset position is greater than or equal to the first preset value and less than or equal to the second preset value.

[0012] In the preferred technical solution of the above-mentioned connecting device, the connecting device includes a first plate, a second plate and a first elastic member, a movable hole is provided on the first plate, the first connecting tube passes through the movable hole, the second plate is connected to the first connecting tube, the two ends of the first elastic member are respectively connected to the first plate and the second plate, and when the second plate moves along the axial direction of the first connecting tube, the first elastic member is deformed.

[0013] In the preferred technical solution of the above-mentioned connecting device, the connecting device also includes a limit member, a first end of the limit member is fixedly connected to one of the first plate member and the second plate member, and a second end of the limit member limits the distance between the first plate member and the second plate member to a preset distance; when one of the first connecting tube and the second connecting tube abuts against the blocking portion, the reaction force of the first elastic member is greater than the preset external force applied to the first shut-off mechanism and the second shut-off mechanism.

[0014] In the preferred technical solution of the above-mentioned connecting device, a first hole is provided on the first plate, the first end of the limiting member is fixedly connected to the second plate, the limiting member passes through the first hole, and a limiting portion is provided at the second end of the limiting member, and the limiting portion is located on the side of the first hole away from the second plate.

[0015] In a second aspect, the present invention further provides a battery pack cooling system, which includes a connecting device according to any one of the above-mentioned preferred technical solutions.

[0016] In a third aspect, the present invention also provides a vehicle, comprising the battery pack cooling system described in the above preferred technical solution.

[0017] When the above technical solution is adopted, the connection device of the present invention includes: a first connecting pipe, a second connecting pipe, a first shut-off mechanism, and a second shut-off mechanism; the first shut-off mechanism is arranged in the first connecting pipe, and the second shut-off mechanism is arranged in the second connecting pipe; one of the first connecting pipe and the second connecting pipe is provided with a blocking portion, and the other of the first connecting pipe and the second connecting pipe abuts the blocking portion; when the first shut-off mechanism and the second shut-off mechanism are subjected to external force, the first connecting pipe and the second connecting pipe can be connected; when one of the first connecting pipe and the second connecting pipe abuts the blocking portion, in the connection area of ​​the first shut-off mechanism and the second shut-off mechanism, the ratio of the flow area of ​​any two radial cross sections is greater than or equal to a first preset value and less than or equal to a second preset value. The utility model controls the ratio of the areas of any two radial cross sections at the connection to be greater than or equal to the first preset value and less than or equal to the second preset value, so that the connection does not produce a sudden diameter change, avoids the generation of eddy currents, and reduces the flow resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0019] Figure 1 This is a structural diagram of a connecting device according to a first preferred embodiment of the present invention;

[0020] Figure 2 It is a structural diagram of a connecting device according to a second preferred embodiment of the present utility model;

[0021] Figure 3 yes Figure 2 Another perspective of the structure diagram;

[0022] Figure 4 It is a structural diagram of the first intercepting mechanism and the second intercepting mechanism of the utility model;

[0023] Figure 5 is a cross-sectional view showing the structure of the second elastic member and the third elastic member after the first connecting pipe and the second connecting pipe are connected in place;

[0024] Figure 6 is a schematic diagram of the connection area when the first shut-off mechanism and the second shut-off mechanism are in full communication;

[0025] Reference numerals:

[0026] 10. First plate member; 101. Moving hole; 102. Limiting hole; 11. Second plate member; 12. First connecting pipe; 121. Fixing part; 13. Second connecting pipe; 131. Blocking part; 132. Second port; 133. Second annular groove; 14. Limiting member; 141. Limiting part; 142. Main body; 15. Nut; 16. First shut-off mechanism; 161. First valve core; 1611. First shut-off part; 162. Moving sleeve; 1621. Annular groove; 1622. First port; 163. Second elastic member; 17. Second shut-off mechanism; 171. Second valve core; 1711. Second shut-off part; 172. Third elastic member; 18. First elastic member; 19. Protective cover. DETAILED DESCRIPTION

[0027] The following describes preferred embodiments of the present invention with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely intended to illustrate the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Those skilled in the art may adjust these embodiments as needed to suit specific applications.

[0028] It should be noted that in the description of this utility model, terms such as "upper," "lower," "front," "back," "left," and "right" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or component described must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In addition, it should be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections or detachable connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal connections between two components or to the mutual abutment and contact connection between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0030] first Figure 1 、 4 5. The connecting device of the present invention includes: a first plate 10, a second plate 11, a first connecting tube 12, a second connecting tube 13, a first shut-off mechanism 16, a second shut-off mechanism 17, and a first elastic member 18; a movable hole 101 is provided on the first plate 10, the first connecting tube 12 passes through the movable hole 101, the first shut-off mechanism 16 is provided in the first connecting tube 12, the second shut-off mechanism 17 is provided in the second connecting tube 13, the first shut-off mechanism 16 and the second shut-off mechanism 17 are in contact and are subjected to an external force to enable the first connecting tube 12 and the second connecting tube 13 to be connected; one of the first connecting tube 12 and the second connecting tube 13 is provided with a blocking portion 13 1. When the other of the first connecting tube 12 and the second connecting tube 13 abuts against the blocking portion 131, the first connecting tube 12 and the second connecting tube 13 are connected in place, and the first shut-off mechanism 16 and the second shut-off mechanism 17 are subjected to a preset external force; the second plate 11 and the first connecting tube 12 are fixedly connected, and the two ends of the first elastic member 18 are respectively connected to the first plate 10 and the second plate 11. When the second plate 11 moves along the axial direction of the first connecting tube 12, the first elastic member 18 is deformed; when the first connecting tube 12 and the second connecting tube 13 abut, the force causing the deformation of the first elastic member 18 is greater than the preset external force applied to the first shut-off mechanism 16 and the second shut-off mechanism 17.

[0031] Since the first connecting tube 12 and the second plate 11 are fixedly connected, the maximum reaction force F1 generated by the first shut-off mechanism 16 and the second shut-off mechanism 17 is the force generated when the first connecting tube 12 and the second connecting tube 13 are connected in place, that is, the preset external force applied to the first shut-off mechanism 16 and the second shut-off mechanism 17. At this time, the total reaction force F1 generated by the first shut-off mechanism 16 and the second shut-off mechanism 17 is the first-stage starting force, and the force transmitted to the second plate 11 by the first-stage starting force is F1. In the initial state, the first elastic member 18 needs to generate a deformation force of F2 if it is to be deformed. F2 is greater than F1. Since F2 is greater than F1, When the first connecting tube 12 and the second connecting tube 13 are not connected in place, the second plate 11 will not move upward, and the first elastic member 18 will not be compressed. That is, when the present invention is installed, the starting force in the first stage only allows the first shut-off mechanism 16 and the second shut-off mechanism 17 to connect the first connecting tube 12 and the second connecting tube 13 in place, that is, only a preset external force is required. In the second stage, after the first connecting tube 12 and the second connecting tube 13 are connected in place, the first connecting tube 12 and the second connecting tube 13 will no longer move relative to each other, and the first shut-off mechanism 16 and the second shut-off mechanism 17 will not change. The upward starting force in the second stage is F2. In the prior art, when the first connecting tube 12 and the second connecting tube 13 are not connected in place, the first elastic member 18 is compressed. In the first stage, there is an additional starting force of the first elastic member 18. Compared with the prior art, the present invention is more labor-saving.

[0032] Furthermore, the connecting device of this preferred embodiment also includes a limit member 14, the upper end of the limit member 14 is fixedly connected to the first plate 10, and the lower end of the limit member 14 limits the first plate 10 and the second plate 11 to have a preset distance; when not installed, in the initial state, when the second plate 11 does not move upward, the initial distance between the second plate 11 and the first plate 10 is the preset distance, and the first elastic member 18 is in a compressed state at the preset distance. In the compressed state, the reaction force of the first elastic member 18 on the second plate 11 is greater than or equal to the preset external force exerted on the first shut-off mechanism 16 and the second shut-off mechanism 17 after the first connecting pipe 12 and the second connecting pipe 13 are connected in place.

[0033] like Figure 5 As shown, the first connecting tube 12 and the second connecting tube 13 are in place when the lower end of the first connecting tube 12 contacts the blocking portion 131 of the second connecting tube 13. Of course, this is only a preferred arrangement. Alternatively, a blocking portion may be provided on the outside of the first connecting tube 12, the first connecting tube 12 extends into the second connecting tube 13, and the first connecting tube 12 and the second connecting tube 13 abut against the blocking portion. The first connecting tube 12 and the second connecting tube 13 are in place when this arrangement is in place. Persons skilled in the art may determine this arrangement based on actual conditions.

[0034] Although in this preferred embodiment, a movable hole 101 is provided on the first plate 10 and the first connecting tube 12 passes through the movable hole 101, this is not restrictive. The movable hole 101 may not be provided on the first plate 10, the first connecting tube 12 may not contact the first plate 10, and may be located on one side of the first plate 10 in the horizontal direction.

[0035] See next Figure 4 ,like Figure 4 As shown, the first shut-off mechanism 16 includes a first valve core 161, a second elastic member 163 and a movable sleeve 162. The first valve core 161 is fixedly connected to the first connecting pipe 12. The outer wall of the movable sleeve 162 fits with the inner wall of the first connecting pipe 12. The diameter of the upper half of the first connecting pipe 12 is smaller than the diameter of the lower half. The movable sleeve 162 fits with the upper half of the first connecting pipe 12. The first valve core 161 is configured to control the on-off state of the movable sleeve 162, and the first valve core 161 can limit The movable sleeve 162 moves downwardly, and a first shut-off portion 1611 is provided on the first valve core 161. A first opening 1622 is provided below the movable sleeve 162. In the initial state, the first shut-off portion 1611 is located in the first opening 1622 and closes the first opening 1622. When the movable sleeve 162 moves upward, the first opening 1622 is opened, and one end of the second elastic member 163 is connected to the movable sleeve 162, and the other end of the second elastic member 163 is connected to the first connecting pipe 12 ( Figure 4 (The portion where the second elastic member 163 connects to the first connecting tube 12 is not shown.) The second elastic member 163 is preferably a vertically disposed cylindrical spring. When the movable sleeve 162 moves in the axial direction of the first connecting tube 12, the second elastic member 163 deforms in the vertical direction. The second elastic member 163 can automatically reset the movable sleeve 162 to the position where the first shut-off portion 1611 closes the first opening 1622.

[0036] The second shut-off mechanism 17 includes: a second valve core 171 and a third elastic member 172. The second valve core 171 is configured to control the on-off state of the second connecting pipe 13. The second valve core 171 is provided with a second shut-off portion 1711, which can close the second port 132 of the second connecting pipe 13; one end of the third elastic member 172 is connected to the second valve core 171, and the other end of the third elastic member 172 is connected to the second connecting pipe 13. When the second connecting pipe 13 extends into the first connecting pipe 12 and pushes the moving sleeve 162 toward the inside of the first connecting pipe 2, the first valve core 161 pushes the second valve core 171 toward the inside of the second connecting pipe 13, the second valve core 171 moves downward, the second port 132 is opened, and the third elastic member 172 is deformed. The third elastic member 172 can cause the second valve core 171 to automatically reset to the position where the second shut-off portion 1711 closes the second port 132.

[0037] See Figure 4 and5 First, the second connecting tube 13 extends into the first connecting tube 12. As the second connecting tube 13 continues to extend, the second connecting tube 13 drives the movable sleeve 162 to move upward, the second elastic member 163 is compressed, and the first valve core 161 is fixed. After the first valve core 161 and the second valve core 171 contact, the second valve core 171 moves downward, and the third elastic member 172 is compressed. When the lower end surface of the first connecting tube 12 contacts the blocking portion 131, the first connecting tube 12 and the second connecting tube 13 are connected in place.

[0038] In addition, in this preferred embodiment, a first annular groove 1621 is provided on the outer side of the movable sleeve 162 , and a first sealing member is provided in the first annular groove 1621 . The first sealing member can seal the gap between the movable sleeve 162 and the first connecting pipe 12 .

[0039] like Figure 4 and 5 As shown, when the first connecting tube 12 and the second connecting tube 13 are in full communication, the second connecting tube 13 is partially inserted into the movable sleeve 162, and a second sealing member is provided between the outer wall of the second connecting tube 13 and the inner wall of the movable sleeve 162. The second connecting tube 13 is provided with a second annular groove 133, and the second sealing member is disposed in the second annular groove 133 to seal the gap between the movable sleeve 162 and the second connecting tube 13.

[0040] The first sealing member and the second sealing member are preferably rubber sealing rings, but may also be other sealing structures as long as they can activate the sealing function and prevent fluid leakage.

[0041] like Figure 5 As shown, the first valve core 161 is fixedly connected to the first connecting pipe 12 through the first fixing portion 121 .

[0042] Furthermore, the connection device of the present invention can be divided into a vehicle-end connection device and a package-end connection device. The boundary between the vehicle-end connection device and the package-end connection device can be referred to Figure 3The dividing line A in the figure, the vehicle-end connecting device is above the dividing line A, and the package-end connecting device is below the dividing line A. The division of the dividing line A only represents the components shown on the outside, and does not mean that the internal components are also divided according to the dividing line A into the vehicle-end connecting device or the package-end connecting device. The vehicle-end connecting device is fixedly connected to the bottom of the vehicle, and the first plate 10 is fixedly connected to the bottom of the vehicle through the connecting device. The first plate 10 cannot move up and down. The package-end connecting device is fixedly connected to the battery pack. When the battery pack is replaced and installed, the battery pack and the package-end connecting device need to be installed together. During the upward installation of the battery pack, the package-end connecting device will move upward. First, the second connecting tube 13 is connected to the first connecting tube 12 in place, and then continues to move upward, so that the second connecting tube 13 moves upward in the movable hole 101.

[0043] See Figure 5 In this preferred embodiment, a limiting hole 102 is provided on the first plate 10, the upper end of the main body 142 of the limiting member 14 is fixedly connected to the first plate 10, the main body 142 is connected to the nut 15, the nut 15 is fixed on the first plate 10, the main body 142 of the limiting member 14 passes through the second plate 11, and a limiting portion 141 is provided at the lower end of the limiting member 14. The limiting portion 141 can make the maximum distance between the first plate 10 and the second plate 11 a preset distance. When the second plate 11 moves upward with the second connecting tube 13, the limiting portion 141 gets closer and closer to the package end connecting device.

[0044] In another preferred embodiment, Figure 2 As shown, one end of the limiting member 14 is fixedly connected to the second plate 11, the main body 142 is connected to the nut 15, the nut 15 is fixed on the second plate 11, the limiting member 14 passes through the limiting hole 102, and the other end of the limiting member 14 is provided with a limiting portion 141, which is located on the side of the limiting hole 102 away from the second plate 11. When the second plate 11 moves upward with the second connecting tube 13, the distance between the limiting portion 141 and the package end connecting device remains unchanged.

[0045] See Figure 5The first elastic member 18 is arranged around the limiting member 14. Specifically, the first elastic member 18 is a spring, and the spring is arranged around the limiting member 14. The limiting member 14 can prevent the spring from deforming irregularly. The limiting member 14 is arranged on the inner ring of the spring, and the gap between the inner ring of the spring and the outer periphery of the limiting member 14 is small, so that the spring can only be compressed or stretched up and down, and prevented from deforming in the left and right directions or tilting. In other words, the limiting member 14 can play a guiding role and prevent the spring from deforming irregularly. Of course, this is only a preferred arrangement. In other embodiments, the first elastic member 18 ... The component 18 can also be arranged not around the limit member 14, and the first elastic component 18 and the limit member 14 are arranged in parallel left and right or front and back; it can also be that the first elastic component 18 is a plurality of springs, and the plurality of springs are arranged around the limit member 14; it can also be that the first elastic component 18 is a leaf spring, and the leaf spring is vertically arranged, and is respectively connected to the first plate member 10 and the second plate member 11 above and below. The first elastic component 18 can also be an elastic sheet plate, which is vertically arranged and is respectively connected to the first plate member 10 and the second plate member 11 above and below. Those skilled in the art can set it according to actual conditions.

[0046] Furthermore, in this preferred embodiment, the connecting device further includes a protective cover 19, the ends of which are connected to the first plate 10 and the second plate 11, respectively. The first elastic member 18 is disposed within the protective cover 19. During the movement of the stopper 14, both the first elastic member 18 and the protective cover 19 are capable of deforming. The provision of the protective cover 19 prevents dust and other debris from entering the interior of the first elastic member 18, thereby preventing it from affecting installation.

[0047] In other embodiments, the first connecting pipe 12 is provided with the second shut-off mechanism 17 as described above, the second connecting pipe 13 is provided with the first shut-off mechanism 16 as described above, and the diameter of the upper half of the second connecting pipe 13 is larger than that of the lower half.

[0048] The second elastic member 163 and the third elastic member 172 are preferably cylindrical springs, but can also be leaf springs, as long as they can achieve fluid flow.

[0049] It should be noted that the present invention does not impose any restrictions on the specific structure of the first shut-off mechanism and the second shut-off mechanism. As long as there are two pipes, each pipe has an elastic component, and the deformation of the elastic component enables other components to control the conduction of the two pipes. In the initial state, the two pipes are shut off separately, which does not deviate from the basic principle of the present invention. The first shut-off mechanism and the second shut-off mechanism are already relatively mature in the existing technology, and no more examples will be given here.

[0050] like Figure 4 and 6As shown, when the first connecting pipe 12 and the second connecting pipe 13 are connected, the ratio of the flow areas of any two radial cross sections in at least three preset positions in the connection area of ​​the first shut-off mechanism 16 and the second shut-off mechanism 17 is greater than or equal to the first preset value and less than or equal to the second preset value. Figure 6 In the figure, the radial cross section is a horizontal cross section. The connection area is the region from dividing line a to dividing line c. Within the region from dividing lines a to c, any three preset positions are selected. When the first connecting tube 12 and the second connecting tube 13 are fully connected, the first shut-off portion 1611 separates from the first opening 1622 and extends into the second connecting tube 13. The first opening 1622 is the first preset position, corresponding to dividing line a. The first shut-off portion 1611 is the second preset position, corresponding to dividing line b. The second shut-off portion 1711 is the third preset position, corresponding to dividing line c. The ratio of the flow area of ​​any two radial cross sections at the first preset position, the second preset position, or the third preset position is a preset value of 1. Alternatively, the ratio of the flow area of ​​any two radial cross sections at the first preset position, the second preset position, or the third preset position is within a preset range of 0.9-1.1.

[0051] The first preset value is preferably 0.9, and the second preset value is preferably 1.1. Of course, this is not restrictive. The first preset value can also be 0.85, and the second preset value can also be 1.15. Calculators in this field can set it according to actual conditions.

[0052] Furthermore, in the present invention, when the first connecting pipe 12 and the second connecting pipe 13 are fully connected, the ratio of the flow areas of any two radial cross sections in the connection region between the first shutoff mechanism 16 and the second shutoff mechanism 17 is greater than or equal to a first preset value and less than or equal to a second preset value. The connection region can be the region from the dividing line a to the dividing line b, or the region from the dividing line a to the dividing line c.

[0053] More preferably, the ratio of the flow areas of any two radial cross sections in the connection region is 1.

[0054] Based on the above arrangement, it is possible to avoid sudden changes in the diameter of the flow path, thereby avoiding the generation of vortices, preventing the increase in resistance, and thus improving the flow rate.

[0055] In a second aspect, the present invention further claims protection for a battery pack cooling system, which includes the connecting device described in any one of the above embodiments.

[0056] In a third aspect, the present invention also claims protection for a vehicle, which includes the battery pack cooling system described in the above example.

[0057] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A connecting device, characterized in that: The connecting device comprises: a first connecting pipe, a second connecting pipe, a first shutoff mechanism, and a second shutoff mechanism; The first shutoff mechanism is disposed in the first connecting pipe, the second shutoff mechanism is disposed in the second connecting pipe, one of the first connecting pipe and the second connecting pipe is provided with a blocking portion, and the other of the first connecting pipe and the second connecting pipe abuts against the blocking portion; When the first shut-off mechanism and the second shut-off mechanism are brought into contact with each other by an external force, the first connecting pipe and the second connecting pipe can be connected; When one of the first connecting pipe and the second connecting pipe abuts the blocking portion, in the connecting region of the first intercepting mechanism and the second intercepting mechanism, the ratio of the flow areas of any two radial cross sections is greater than or equal to a first preset value and less than or equal to a second preset value.

2. The connecting device according to claim 1, characterized in that When one of the first connecting pipe and the second connecting pipe abuts the blocking portion, a ratio of flow areas of any two radial cross sections in at least three preset positions in the connecting area is greater than or equal to a first preset value and less than or equal to a second preset value.

3. The connection device according to claim 2, characterized in that The first shut-off mechanism includes a first valve core, a second elastic member and a movable sleeve. The first valve core is fixedly connected to the first connecting tube, and the outer wall of the movable sleeve is in contact with the inner wall of the first connecting tube; the first end of the second elastic member is connected to the movable sleeve, and the second end of the second elastic member is connected to the first connecting tube, and the movable sleeve can move in the axial direction of the first connecting tube.

4. The connection device according to claim 3, characterized in that The second shut-off mechanism includes: a second valve core and a third elastic member, The first end of the third elastic member is connected to the second valve core, the second end of the third elastic member is connected to the second connecting tube, the second connecting tube extends into the first connecting tube, the first connecting tube abuts against the movable sleeve, and the first valve core abuts against the second valve core.

5. The connecting device according to claim 4, characterized in that The movable sleeve has a first port, the first valve core has a first shutoff portion, the first shutoff portion can control the communication state of the first port, the second valve core has a second shutoff portion, the second shutoff portion can control the communication state of the second connecting pipe, When one of the first connecting tube and the second connecting tube abuts against the blocking portion, the first intercepting portion separates from the first opening and extends into the second connecting tube. The first opening is at a first preset position, the first intercepting portion is at a second preset position, and the second intercepting portion is at a third preset position. The ratio of the flow areas of any two radial cross sections in the first preset position, the second preset position, and the third preset position is greater than or equal to a first preset value and less than or equal to a second preset value.

6. The connection device according to claim 1, characterized in that The connecting device includes a first plate, a second plate and a first elastic member, A movable hole is provided on the first plate, the first connecting tube passes through the movable hole, the second plate is connected to the first connecting tube, the two ends of the first elastic member are respectively connected to the first plate and the second plate, and when the second plate moves along the axial direction of the first connecting tube, the first elastic member is deformed.

7. The connection device according to claim 6, characterized in that The connecting device further includes a limiting member, The first end of the limiting member is fixedly connected to one of the first plate and the second plate, and the second end of the limiting member limits the distance between the first plate and the second plate to a preset distance; When one of the first connecting pipe and the second connecting pipe abuts against the blocking portion, the reaction force of the first elastic member is greater than the preset external force applied to the first intercepting mechanism and the second intercepting mechanism.

8. The connecting device according to claim 7, characterized in that A first hole is provided on the first plate, the first end of the limiting member is fixedly connected to the second plate, the limiting member passes through the first hole, and a limiting portion is provided on the second end of the limiting member, which is located on a side of the first hole away from the second plate.

9. A battery pack cooling system, characterized in that: The battery pack cooling system includes the connecting device according to any one of claims 1 to 8.

10. A vehicle, characterized in that: The vehicle includes the battery pack cooling system described in claim 9.

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