Accordion-shaped tube, accordion-shaped tube type heat exchanger, and vehicle

Abstract

Accordion-shaped tube, accordion-shaped tube type heat exchanger, and vehicle. The accordion-shaped tube includes a plurality of flow paths arranged at intervals, and the inner walls of at least some of the flow paths are provided with protrusions protruding in a direction approaching the center of the flow path and / or recesses recessed in a direction away from the center of the flow path. The protrusions and recesses can enable the liquid fluid (refrigerant) to rapidly nucleate and can also rupture large nuclei that grow disorderly, thereby preventing the large nuclei from forming a boundary layer on the inner wall of the flow path. As a result, the nuclei can be rapidly separated from the wall surface. Therefore, the heat exchange performance of the accordion-shaped tube is improved, and the heat exchange requirements of the traction battery are satisfied.

Description

Technical Field

[0001] Cross - reference to Related Applications This disclosure claims the priority of Chinese Patent Application No. 202210772676.7, entitled "HARMONICA - SHAPED TUBE, HARMONICA - SHAPED TUBE TYPE HEAT EXCHANGER AND VEHICLE", filed on June 30, 2022, the entire content of which is incorporated herein by reference.

[0002] This disclosure relates to the field of battery heat exchangers, and in particular, to harmonic tubes, harmonic tube heat exchangers, and vehicles.

Background Art

[0003] In related technologies, a power battery direct - cooling heat exchanger is mainly formed by welding a harmonic tube, a collecting tube assembly, an end collecting tube, a connector, and a temperature equalization plate. On the one hand, the flow path is arranged in the harmonic tube, and the refrigerant mainly performs boiling heat transfer rather than convective heat transfer inside the harmonic tube. The inner wall of the flow path of the harmonic tube is smooth. The refrigerant enters from one end and flows out from the other end. On the one hand, the contact time between the refrigerant and the inner wall surface is too short to contribute to nucleation. On the other hand, when nucleation occurs, the nuclei always move smoothly along the inner wall surface and cannot quickly detach from the wall surface, thereby significantly reducing the heat exchange capacity.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The purpose of this disclosure is to provide a harmonic tube, a harmonic tube heat exchanger, and a vehicle. The harmonic tube can improve the boiling heat transfer capacity through protrusions and / or recesses formed on the inner side wall of the flow path of the harmonic tube in order to overcome the technical problem of insufficient heat exchange capacity of conventional harmonic tubes.

Means for Solving the Problems

[0005] In order to achieve the above object, in a first aspect of the present disclosure, the harmonica tube includes a plurality of flow paths arranged at intervals, and at least a part of the inner side wall of the flow path is provided with a protruding portion protruding in a direction approaching the center of the flow path and / or a recessed portion recessed in a direction away from the center of the flow path.

[0006] In one embodiment, the protruding portion is formed on the inner side wall of the flow path and penetrates the flow path along the length direction of the flow path.

[0007] Alternatively, the protruding portions are arranged in a spiral shape along the length direction of the flow path.

[0008] Alternatively, the number of the protruding portions is plural, and the plural protruding portions are arranged at intervals along the length direction of the flow path.

[0009] In one embodiment, the recessed portion is formed on the inner side wall of the flow path and penetrates the flow path along the length direction of the flow path.

[0010] Alternatively, the recessed portions are arranged in a spiral shape along the length direction of the flow path.

[0011] Alternatively, the number of the recessed portions is plural, and the plural recessed portions are arranged at intervals along the length direction of the flow path.

[0012] In one embodiment, the number of the protruding portions is plural, the plural protruding portions extend along the length direction of the flow path, and are arranged at intervals along the circumferential direction of the flow path.

[0013] Alternatively, the number of the recessed portions is plural, the plural recessed portions extend along the length direction of the flow path, and are arranged at intervals along the circumferential direction of the flow path.

[0014] In one embodiment, the number of the protruding portions is 2, and the two protruding portions are arranged on two opposite side portions of the flow path.

[0015] In a second aspect of the present disclosure, there is provided a harmonica tube heat exchanger including a collection tube assembly, a terminal collection tube, a connector, a temperature equalization plate, and a plurality of the harmonica tubes.

[0016] Here, the collection tube assembly includes a first collection tube and a second collection tube. The inlet of the connector communicates with the first end of a part of the plurality of harmonica tubes through the first collection tube, and the outlet of the connector communicates with the first end of another part of the plurality of harmonica tubes through the second collection tube. The second ends of the plurality of harmonica tubes respectively communicate with the terminal collection tube.

[0017] And the plurality of harmonica tubes are fixedly arranged on the temperature equalization plate.

[0018] In one embodiment, in a direction perpendicular to the extending direction of the harmonica tubes, at least two of the outermost harmonica tubes among the plurality of harmonica tubes communicate with the first collection tube.

[0019] In one embodiment, the number of the harmonica tubes is 8. In a direction perpendicular to the extending direction of the harmonica tubes, the first ends of the innermost 4 harmonica tubes respectively communicate with the second collection tube, and the first ends of the other 4 harmonica tubes communicate with the first collection tube.

[0020] In one embodiment, the first collection tube is provided with a plurality of first strip-shaped holes extending along the length direction of the first collection tube. The first ends of the harmonica tubes are fixedly connected to the first strip-shaped holes, whereby the plurality of flow paths of the harmonica tubes can communicate with the first collection tube.

[0021] And / or the second collection tube is provided with a plurality of second strip-shaped holes extending along the length direction of the second collection tube. The first ends of the harmonica tubes are fixedly connected to the second strip-shaped holes, whereby the plurality of flow paths of the harmonica tubes can communicate with the second collection tube.

[0022] And / or, the end collecting pipe is provided with a plurality of third strip-shaped holes extending along the length direction of the end collecting pipe, and the second end of the harmonica pipe is fixedly connected to the third strip-shaped holes, whereby the plurality of flow paths of the harmonica pipe can communicate (lead through) with the end collecting pipe.

[0023] In a third aspect of the present disclosure, a vehicle including a power battery is also provided, and the vehicle further includes the above-mentioned harmonica pipe heat exchanger.

[0024] The technical scheme, that is, by the harmonica pipe of the present disclosure, the protrusions and / or recesses are arranged on the inner side walls of the plurality of flow paths or a part of the plurality of flow paths. The protrusions and recesses can be used as vaporization cores, whereby the liquid fluid (refrigerant) can be rapidly nucleated and evaporated. On the one hand, the protrusions and / or recesses can also disrupt the disorderly growth of large nuclei (bubbles) after nucleation, thereby rapidly detaching the large nuclei (bubbles) from the wall of the flow path and preventing the formation of a boundary layer on the surface of the inner side wall of the flow path by the nucleated large nuclei (bubbles), improving the heat transfer capacity of the harmonica pipe and meeting the heat transfer needs of the power battery.

[0025] Additional aspects and advantages of the present disclosure will be described in detail in the following detailed description.

[0026] The drawings included to provide a further understanding of the present disclosure and constituting a part of the description are used together with the following detailed description to explain the present disclosure and are not intended to unduly limit the present disclosure.

Brief Description of the Drawings

[0027]

Figure 1

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Figure 5

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Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0028] It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes of the present disclosure only and are not intended to limit the present disclosure.

[0029] In the present disclosure, unless otherwise explicitly specified and limited, the terms "upper", "lower", "left", and "right" are generally used to refer to the upper, lower, left, and right corresponding to the figure, and "inner" and "outer" refer to "inner and outer" with respect to the contour of the corresponding component itself. In addition, terms such as "first", "second", "third", "fourth", etc. are used in the present disclosure to distinguish one element from another element, and are not sequential or important. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings indicate the same or similar elements. The above definitions are merely for the purpose of explaining and describing the present disclosure and should not be construed as limiting the present disclosure.

[0030] In the related art, the power battery direct cooling heat exchanger is mainly formed by welding a harmonic tube, a collector tube assembly, an end collector tube, a connector, and a temperature equalization plate. Different from liquid cooling, the refrigerant in the harmonic tube will gradually change from a liquid to a gas-liquid two-phase state and can finally become a gas. Therefore, the heat transfer performs boiling heat transfer instead of convective heat transfer in the harmonic tube. According to the characteristics of boiling heat transfer, in order to have the best heat exchange capacity, it is necessary that the liquid refrigerant in the harmonic tube can quickly nucleate and detach from the wall surface. If the nucleation rate of the nuclei is too slow, or the rate of detachment from the wall surface after nucleation is too slow, or the nuclei continuously grow and further block the entire pipeline, the heat exchange capacity may be significantly reduced. However, the smooth inner side wall of the harmonic tube currently does not have a method to quickly create nuclei in the liquid refrigerant, and after nucleation, the nuclei cannot be quickly detached from the wall surface.

[0031] As shown in FIG. 1, in the related art, the inner sidewall of the flow path 11 of the harmonica tube 10 is smooth. The refrigerant enters from one end and flows out from the other end. The speed at which the refrigerant contacts the wall surface of the flow path 11 is too fast, which is disadvantageous for nucleation. After nucleation, when the fluid (refrigerant) flows inside the harmonica tube 10, a boundary layer is formed on the inner sidewall surface of the flow path 11 of the harmonica tube 10, and the boundary layer will prevent the heat exchange of the fluid. In other words, the conventional harmonica tube 10 may have a slow nucleation rate of the refrigerant. At the same time, whether the nuclei grow from small nuclei to large nuclei, or the nuclei of the liquid always move smoothly on the wall surface and cannot be quickly detached from the wall surface, etc. This will particularly seriously affect the heat exchange capacity of the direct cooling heat exchanger under the conditions of high heat generation of the power battery, so it is particularly important to design a harmonica tube that can enhance heat transfer.

[0032] As shown in FIGS. 2 to 4, in order to achieve the above object, in the first aspect of the present disclosure, the harmonica tube 100 includes a plurality of flow paths 110 arranged at intervals, and at least a part of the inner sidewall of the flow path 110 is provided with a protrusion 111 protruding in a direction approaching the center of the flow path 110 and / or a recess 112 recessed in a direction away from the center of the flow path 110.

[0033] Due to the technical scheme, that is, by the harmonica tube 100 of the present disclosure, the protrusion 111 and / or the recess 112 are arranged on the inner sidewall of the plurality of flow paths 110 or a part of the flow path 110. The protrusion 111 and the recess 112 can be used as vaporization cores, whereby the liquid fluid (refrigerant) can be rapidly nucleated and evaporated. On the one hand, the protrusion 111 and / or the recess 112 can also disrupt the disordered growth of large nuclei (bubbles) after nucleation, thereby rapidly detaching the large nuclei (bubbles) from the wall of the flow path 110 and preventing the formation of a boundary layer on the inner sidewall surface of the flow path by the nucleated large nuclei (bubbles), improving the heat transfer ability of the harmonica tube 100 and meeting the heat transfer needs of the power battery 600.

[0034] The inner sidewalls of the respective flow paths 110 are provided with protrusions 111 or recesses 112, or both protrusions 111 and recesses 112 simultaneously, to avoid the situation where fluid cannot be nucleated due to a fast flow along the surface of the inner sidewall of the flow path, to avoid the formation of a boundary layer on the inner sidewall, and it should be noted that the boiling heat transfer capacity of the harmonic tube 100 can be improved to meet the high heat exchange requirements of the power battery 600 currently and in the future.

[0035] In the plurality of flow paths 110 of the harmonic tube, each flow path 110 is provided with protrusions 111 and / or recesses 112 in order to maximize the heat exchange capacity of the entire harmonic tube 100. Naturally, the protrusions 111 and / or recesses 112 may also be arranged on the inner sidewalls of some of the flow paths 110 (one flow path 110, or two or more flow paths 110) in the plurality of flow paths 110 to improve the heat exchange capacity of the entire harmonic tube 100 to some extent. It can be understood that the number of flow paths 110 provided with protrusions 111 and / or recesses 112 may be selected by the technician as desired.

[0036] As shown in FIGS. 2 and 3, when the protrusion 111 is disposed on the inner sidewall of the flow path 110, the protrusion 111 may be configured by any suitable structure. In some embodiments of the present disclosure, the protrusion 111 may be formed on the inner sidewall of the flow path 110, and the protrusion 111 penetrates the flow path 110 along the length direction of the flow path 110. The protrusion 111 extends along the length direction of the harmonic tube 100 and can extend from one end of the flow path 110 of the harmonic tube 100 to the other end. When the refrigerant is superheated and flows through the flow path 110, the refrigerant can be nucleated by using the protrusion 111 as a vaporization core to form bubbles and flow along the flow path 110. On the one hand, in order to prevent the formation of a boundary layer on the surface of the inner sidewall of the flow path 110 and affect heat exchange, the protrusion 111 can also destroy the randomly growing bubbles.

[0037] In some embodiments, the protrusion 111 may also be arranged spirally along the length direction of the flow path 110. The protrusion 111 can have a protruding structure that is continuous in the length direction of the flow path 110 and protrudes in a direction approaching the center of the flow path 110. That is, the protrusion 111 can extend from one end of the flow path 110 to the other end. Of course, the protruding structure may also be configured as a plurality of sub-protrusions arranged at intervals along the spiral direction, and can also play a role in improving the heat exchange effect. The spirally arranged protrusion 111 can be used as a vaporization core under the condition that the refrigerant is superheated, which is beneficial to the nucleation of bubbles. At the same time, it can prevent nuclei growing disorderly from growing and adhering to the wall surface to form a boundary layer that affects heat exchange.

[0038] In some embodiments, the number of the protrusions 111 is plural, and the protrusions 111 are arranged at intervals along the length direction of the flow path 110. For example, the protrusion 111 may be configured as an arc structure, a triangular structure, a rectangular structure, or other polygonal structures, and are arranged at intervals along the length direction of the flow path 110. That is, a plurality of separated protrusions 111 are arranged along the length direction, whereby the nucleation of the refrigerant can be achieved, the boundary layer can be destroyed, and the boiling heat exchange capacity can be improved.

[0039] As shown in FIG. 4, when the recess 112 is provided on the inner side wall of the flow path 110, the recess 112 may be configured by any suitable structure. In some embodiments of the present disclosure, the recess 112 is formed on the inner side wall of the flow path 110 and penetrates the flow path 110 along the length direction of the flow path 110. The recess 112 can extend along the length direction of the harmonic pipe 100 and can extend from one end of the flow path 110 of the harmonic pipe 100 to the other end. When the refrigerant is superheated and flows through the flow path 110, the refrigerant can be nucleated by using the recess 112 as a vaporization core to form bubbles and flow along the flow path 110. On the one hand, in order to prevent a boundary layer from being formed on the surface of the inner side wall of the flow path 110 and affecting heat exchange, the recess can also destroy the bubbles growing disorderly.

[0040] In some embodiments, the recess 112 is arranged spirally along the length direction of the flow path 110. The recess 112 can have a structure that is continuous in the length direction of the flow path 110 and recessed in a direction away from the center of the flow path 110. That is, the recess structure can extend from one end of the flow path 110 to the other end. Of course, the recess structure can also be configured as a plurality of sub-grooves arranged at intervals along the spiral direction, and can also play a role in improving the heat exchange effect.

[0041] In some embodiments, the number of the recesses 112 may be plural, and the recesses 112 are arranged at intervals along the length direction of the flow path 110. For example, the recess 112 may be configured as an arc groove, a triangular groove, a rectangular groove, or other polygonal grooves, and are arranged at intervals along the length direction of the flow path 110. That is, a plurality of separated recesses 112 are arranged along the length direction, whereby the nucleation of the refrigerant can be achieved, the boundary layer can be destroyed, and the boiling heat exchange capacity can be improved.

[0042] In other embodiments, the number of the protrusions 111 may be plural, the protrusions 111 extend along the length direction of the flow path 110, and are arranged at intervals along the circumferential direction of the flow path 110. The plurality of protrusions 111 may be arranged at intervals along the length direction of the flow path 110, and the plurality of protrusions 111 may be arranged at intervals along the circumferential direction of the flow path 110. In the length direction of the flow path 110, the plurality of protrusions 111 may be arranged on a plurality of straight lines, or arranged in another way. When the refrigerant is superheated and flows through the flow path 110, the plurality of protrusions 111 arranged in the length direction and the circumferential direction are used as vaporization cores for nucleation, and can form bubbles and flow along the flow path 110. On the one hand, the plurality of protrusions 111 can more effectively break the randomly growing bubbles in order to prevent the bubbles from forming a boundary layer on the inner side wall surface of the flow path 110 and affecting the heat exchange.

[0043] Furthermore, in other embodiments, the number of the recesses 112 may be plural, and the recesses 112 extend along the length direction of the flow path 110 and are arranged at intervals along the circumferential direction of the flow path 110. The plurality of recesses 112 may be arranged at intervals along the length direction of the flow path 110, and the plurality of recesses 112 may also be arranged at intervals along the circumferential direction of the flow path 110. In the length direction of the flow path 110, the plurality of recesses 112 may be arranged on a plurality of straight lines or may be arranged in another way. The plurality of recesses 112 extend along the length direction and are arranged at intervals along the circumferential direction, whereby the vaporization core can be increased and nucleation can be formed, the boundary layer can be effectively broken, and the heat exchange effect can be improved.

[0044] As shown in FIG. 3, in some embodiments, the number of the protrusions 111 is 2, and the two protrusions 111 are provided on two opposite sides (side walls, side surfaces) of the flow path 110. Here, the protrusion 111 is configured as a boss, the downward boss is arranged in the middle part of the upper side wall of the flow path 110, and the upward boss is arranged in the middle part of the lower side wall of the flow path 110, that is, the two bosses are arranged opposite to each other. The cross section of the flow path 110 forms a substantially H shape, and the use of the two bosses can improve the nucleation of the fluid (refrigerant), can also reduce the formation of the fluid boundary layer, thereby reducing the thermal resistance of the fluid boundary layer, strengthening the heat transfer, and enhancing the heat exchange ability of the fluid. The flow path 110 of the entire harmonic pipe 100 can adopt the above H-shaped cross section to strengthen the heat transfer of the entire harmonic pipe 100.

[0045] In some embodiments, in the plurality of flow paths 110 of the harmonic pipe 100, the protrusion 111 may be arranged in one part of the flow path 110, the recess 112 may be arranged in another part of the flow path 110, or the protrusion 111 and the recess 112 may be arranged in one part of the flow path 110, and the protrusion 111 or the recess 112 may be arranged in another part of the flow path 110. That is, various substitutions and combinations of various forms of the above-described scheme may be executed, which should be within the protection scope of the present disclosure and will not be repeatedly described here.

[0046] As shown in FIGS. 5 to 10, in the second aspect of the present disclosure, a mouth organ tube heat exchanger 1001 including a collection tube assembly 200, a terminal collection tube 300, a connector 400, a temperature equalization plate 500, and a plurality of mouth organ tubes 100 is provided. The collection tube assembly 200 includes a first collection tube 210 and a second collection tube 220. The inlet 401 of the connector 400 communicates with a first end 101 of one part of the plurality of mouth organ tubes 100 through the first collection tube 210, and the outlet 402 of the connector 400 communicates with a first end 101 of another part of the mouth organ tubes 100 through the second collection tube 220. The second ends 102 of the mouth organ tubes 100 communicate with the terminal collection tube 300 respectively. The plurality of mouth organ tubes 100 are fixed to the temperature equalization plate 500.

[0047] The mouth organ tube 100 having the above-described enhanced heat transfer is applied to the heat exchanger of the battery pack. As shown in FIG. 5, a mouth organ tube heat exchanger 1001 is formed. The mouth organ tube heat exchanger 1001 includes a connector 400, a collection tube assembly 200, a terminal collection tube 300, a temperature equalization plate 500, and the above-described mouth organ tubes 100, and is connected by welding. The two through holes inside the connector 400 are provided as the inlet 401 and the outlet 402 of the entire heat exchanger. The first collection tube 210 and the second collection tube 220 forming the collection tube assembly 200 and the terminal collection tube 300 are all made of circular aluminum tubes. A plurality of holes corresponding to the width of the mouth organ tubes 100 are provided on the side surfaces of the circular aluminum tubes, and flow paths are also formed in the circular aluminum tubes. The connector 400, the first collection tube 210, the second collection tube 220, the mouth organ tubes 100, and the terminal collection tube 300 are embedded and welded to each other, and the through holes of the components communicate with each other to form the flow path of the heat exchanger. In order to increase the heat exchange area of the entire heat exchanger, the temperature equalization plate 500 is welded to the plurality of mouth organ tubes 100.

[0048] Note that in order to improve the distribution uniformity, the inlet 401 of the connector 400 can communicate with the middle part of the first collecting pipe 210 via the first connecting pipe 230, and the outlet 402 of the connector 400 can communicate with the middle part of the second collecting pipe 220 via the second connecting pipe 240.

[0049] The accordion tube heat exchanger 1001 is connected to the air conditioning system via the connector 400 to cool or heat the battery (e.g., the power battery 600) in the battery pack, thereby maintaining the battery at an appropriate operating temperature.

[0050] When the battery temperature is relatively high and needs to be cooled, the air conditioning system receives the cooling requirement of the battery system, distributes the refrigerant of the air conditioning system to the accordion tube heat exchanger 1001, and the refrigerant flows from the inlet 401 of the connector 400 to the first collecting pipe 210, then flows to a part of the accordion tube 100. In this part of the accordion tube 100, the refrigerant flows to the end collecting pipe 300, then flows from the other accordion tubes 100 to the second collecting pipe 220, and finally flows out from the outlet 402 of the connector 400. At this time, the temperature of the battery is transmitted to the temperature equalization plate 500, and the temperature equalization plate 500 transfers heat to the accordion tube 100. Since the accordion tube 100 is an accordion tube 100 with enhanced heat transfer, the heat exchange efficiency is higher. Thereby, compared with the conventional accordion tube 100, the accordion tube 100 removes more heat from the battery, the cooling is faster, and the accordion tube 100 is more beneficial for the operation of the battery.

[0051] As shown in FIGS. 5 and 6, the power battery 600 adopts a long horizontally arranged battery scheme. The two ends of the power battery 600 are the battery positive electrode 610 and the battery negative electrode 620 respectively. The battery positive electrode 610 of the power battery 600 faces the direction of the battery negative electrode 620 and is perpendicular to the length direction of the harmonica tube 100 of the harmonica heat exchanger. In a high-temperature environment, when the power battery 600 is charged or operated, the temperatures at both ends of the positive and negative electrodes of the power battery 600 are higher than the intermediate temperature. Therefore, when the power battery 600 is cooled, the first consideration is the cooling of the two ends of the power battery 600. Similarly, in a severe cold environment, when the power battery 600 is charged or operated, the temperatures at both ends of the positive and negative electrodes of the power battery 600 are higher than the intermediate temperature. Therefore, when the power battery 600 is heated, the intermediate heating of the power battery 600 should be considered first.

[0052] In some embodiments, at least the outermost two of the plurality of harmonica tubes 100 communicate with the first collecting tube 210 in a direction perpendicular to the extending direction of the harmonica tube 100. On the one hand, among the two harmonica tubes 100 positioned outermost, one corresponds to the battery positive electrode 610 at one end of the power battery 600, and the other corresponds to the battery negative electrode 620 at the opposite end of the power battery 600, and the other harmonica tubes 100 correspond to the middle portion of the power battery 600. It can be understood that perpendicular to the extending direction of the harmonica tube, it can coincide with the arrangement direction of the plurality of harmonica tubes. When the power battery 600 needs to be cooled, the connector 400 of the heat exchanger is connected to the air conditioner, that is, the refrigerant of the air conditioning system enters from the inlet 401 of the connector 400, flows into the first collecting tube 210, and then from the first collecting tube 210, it is divided and flows into the harmonica tubes 100 on the outermost left and right sides or near the outside, and then flows back to the second collecting tube 220 through the end collecting tube 300 and other intermediate harmonica tubes 100, and then flows out of the air conditioning system from the outlet 402 of the connector 400. The heat exchanger is connected in parallel with the air conditioning system of the whole vehicle through the connector 400. When the power battery system needs to be cooled, the air conditioning controller controls the refrigerant to flow through the heat exchanger, thereby achieving the effect of cooling the power battery 600.

[0053] Similarly, when the temperature of the power battery 600 is low and it needs to be heated, the refrigerant enters through the outlet 402 of the connector 400, flows through the second collecting tube 220 and the plurality of intermediate harmonica tubes 100, returns to the first collecting tube 210 through the end collecting tube 300 and the outermost harmonica tubes 100, and then flows out of the air conditioning system through the inlet 401 of the connector 400, thereby enabling electric heating to be achieved.

[0054] As shown in FIG. 7, in some embodiments, the number of harmonica tubes can be eight. In a direction perpendicular to the extending direction of the harmonica tubes 100, the first ends 101 of the four innermost harmonica tubes 100 communicate with the second collecting tube 220 respectively, and the first ends 101 of the two harmonica tubes 100 positioned on both sides of the four harmonica tubes 100 communicate with the first collecting tube 210 respectively.

[0055] In the extending direction of the harmonica tubes 100, that is, in a direction perpendicular to the direction in which the battery positive electrode 610 of the power battery 600 faces the battery negative electrode 620, the four innermost harmonica tubes 100 communicate with the second collecting tube 220 respectively, and the other four harmonica tubes 100 communicate with the first collecting tube 210 respectively. The first ends 101 of the two harmonica tubes 100 positioned on the leftmost side and the two harmonica tubes 100 positioned on the rightmost side communicate with the first collecting tube 210 respectively. The first ends 101 of the four harmonica tubes 100 positioned at the intermediate positions communicate with the second collecting tube 220 respectively. The second ends 102 of the eight harmonica tubes 100 communicate with the terminal collecting tube 300 respectively. During the cooling process, the refrigerant of the air conditioning system enters from the inlet 401 of the connector 400 and flows through the first collecting tube 210 into the two harmonica tubes 100 on the left side and the two harmonica tubes 100 on the right side respectively. The refrigerant converges at the second ends 102 of the four harmonica tubes 100 into the terminal collecting tube 300, flows into the second collecting tube 220 through the four harmonica tubes 100 that communicate with the terminal collecting tube 300 and are positioned in the middle, and then flows back into the air conditioning system through the outlet 402 of the connector 400 to achieve circulation. In the flowing process, the refrigerant first enters the two harmonica tubes 100 on the leftmost side and the two harmonica tubes 100 on the rightmost side to cool the two ends of the higher-temperature power battery 600, so that the two ends of the higher-temperature power battery 600 can reach the appropriate temperature range as soon as possible. Then, the four harmonica tubes 100 positioned at the intermediate positions cool the intermediate position of the battery, so that the cooling requirements of different regions of the power battery 600 can be met, and the temperature difference can be avoided. In the heating process, the direction of the flow is exactly the opposite, that is, the refrigerant enters through the outlet 402 of the connector 400 and flows out from the inlet 401 of the connector 400, so that the middle part of the power battery 600 with a relatively low temperature can be preferentially heated. Then, the two end regions with a relatively higher temperature can be heated, so that the temperature requirements of the power battery 600 can be met as soon as possible.

[0056] As shown in FIGS. 8, 9, and 10, the harmonica tube 100 can be connected to the first collecting tube 210, the second collecting tube 220, and the end collecting tube 300 in any suitable manner. In some embodiments of the present disclosure, the first collecting tube 210 includes a plurality of first strip-shaped holes 211 extending along its length direction. The first end 101 of the harmonica tube 100 is fixedly connected to the first strip-shaped holes 211, whereby a plurality of flow paths 110 of the harmonica tube 100 can communicate with the first collecting tube 210. The inside of the first collecting tube 210 includes a plurality of first strip-shaped holes 211 corresponding to the width of the first end 101 of the harmonica tube 100 to be connected. The harmonica tube 100 is inserted into the first strip-shaped holes 211 and connected to the first strip-shaped holes 211 by welding. It should be noted that the first end 101 of the harmonica tube 100 may be formed with a bent portion to save space along the length direction of the harmonica tube 100. The bent portion is bent downward, inserted into the first strip-shaped holes 211 for a specific length, and then the harmonica tube 100 and the first collecting tube 210 are connected by brazing, thereby avoiding blocking the flow path 110 of the harmonica tube 100 during the welding process.

[0057] In some embodiments, the second collecting pipe 220 is provided with a plurality of second strip-shaped holes 221 extending along its length direction, and the first end 101 of the harmonica pipe 100 is fixedly connected to the second strip-shaped holes 221, whereby the plurality of flow paths 110 of the harmonica pipe 100 can communicate with the second collecting pipe 220. The inside of the second collecting pipe 220 is provided with a plurality of second strip-shaped holes 221 corresponding to the width of the first end 101 of the harmonica pipe 100 to be connected. The harmonica pipe 100 is inserted into the second strip-shaped holes 221 and connected to the second strip-shaped holes 221 by welding. Similarly, the first end 101 of the harmonica pipe 100 may be formed with a bent portion to save space along the length direction of the harmonica pipe 100. The bent portion is bent downward and inserted into the second strip-shaped holes 221 for a specific length. Then, the harmonica pipe 100 is connected to the second collecting pipe 220 by brazing, thereby avoiding blocking the flow paths 110 of the harmonica pipe 100 during the welding process.

[0058] In some embodiments, the terminal collecting pipe 300 is provided with a plurality of third strip-shaped holes 301 extending along its length direction, and the second end 102 of the harmonica pipe 100 is fixedly connected to the third strip-shaped holes 301, whereby the plurality of flow paths 110 of the harmonica pipe 100 can communicate with the terminal collecting pipe 300. A plurality of third strip-shaped holes 301 corresponding to the width of the second end 102 of the harmonica pipe 100 to be connected are formed inside the terminal collecting pipe 300. The harmonica pipe 100 is inserted into the third strip-shaped holes 301 and connected to the third strip-shaped holes 301 by welding. The second end 102 of the harmonica pipe 100 is a straight portion, whereby the second end 102 of the harmonica pipe 100 can be directly disposed in the third strip-shaped holes 301. Then, the harmonica pipe 100 and the terminal collecting pipe 300 are connected by brazing, whereby the problem of blocking the flow paths 110 of the second end 102 of the harmonica pipe 100 is not required, and the assembly efficiency can be improved.

[0059] In some embodiments, the end collecting pipe 300 can also be a circular aluminum pipe. Both ends of the circular aluminum pipe are sealed. The second ends 102 of the plurality of harmonic pipes 100 are connected to the circular aluminum pipe at intervals, so that the refrigerant can flow into a part of the harmonic pipe 100 and flow out from other parts of the harmonic pipe 100. In order to achieve the above effect of improving the stability of the internal flow, a sealing member 310 for blocking the internal flow path is arranged at the middle position of the circular aluminum pipe to divide the circular pipe into two sections. The four harmonic pipes 100 on the left communicate with one section, and the four harmonic pipes 100 on the right communicate with the other section. It should be noted that the purpose of stabilizing the flow rate can also be achieved thereby.

[0060] As shown in FIG. 11, in the third aspect of the present disclosure, a vehicle 1000 including a power battery 600 is provided. The vehicle 1000 further includes the above-mentioned harmonic heat exchanger 1001. Since the harmonic pipe heat exchanger 1001 adopts a structural design in which the flow path 110 is provided with protrusions 111 and / or recesses 112, the power battery 600 of the vehicle 1000 can be cooled or heated better.

[0061] In summary, in the harmonic pipe 100, the harmonic pipe heat exchanger 1001, and the vehicle 1000 of the present disclosure, boiling heat transfer, especially forced boiling, is considered to occupy a dominant position in the harmonic pipe heat exchanger 1001. Therefore, according to the characteristics of forced boiling and the characteristics of liquid nucleation during boiling, a structural design for enhancing heat transfer is implemented by arranging protrusions 111 and / or recesses 112 on the entire inner side wall of the flow path 110 of the harmonic pipe 100 or a part of the flow path 110. Thereby, the liquid nucleation rate can be increased. On the one hand, the nuclei continuously expand to form a film, and thereby, the limitation of heat transfer can be restricted. The heat exchange capacity of the harmonic pipe 100 is improved, and the heat exchange requirements of the power battery 600 are met.

[0062] Preferred embodiments of the present disclosure have been described in detail above with reference to the drawings. However, the present disclosure is not limited to the specific details of the above-described embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications may be made to the technical solution of the present disclosure, and all simple modifications belong to the protection scope of the present disclosure.

[0063] It should also be noted that the various specific technical features described in the embodiments detailed above may be combined in any suitable manner without contradiction. To avoid unnecessary repetition, various possible combinations are not described separately in the present disclosure.

[0064] In addition, various embodiments of the present disclosure may be combined in any way without departing from the spirit of the present disclosure, which should also be regarded as a disclosure of the present disclosure. Specifically, image information at the same angle as the rearview mirror can be captured by using the left and right cameras respectively installed on the rearview mirror of the vehicle, and processed to determine whether an obstacle or a pedestrian is within the range. Alternatively, rear image information is collected by using a millimeter-wave radar installed at the rear of the vehicle, and based on the rear image information, it is determined whether an approaching vehicle exists behind the vehicle. In addition, image information regarding both sides of the vehicle is collected by using ultrasonic radars installed on the vehicle body.

Claims

1. A harmonica tube, comprising a plurality of flow paths (110) arranged at intervals, wherein at least a part of the inner side wall of the flow path (110) is provided with a protrusion (111) protruding in a direction approaching the center of the flow path (110), and / or is provided with a recess (112) recessed in a direction away from the center of the flow path (110).

2. The inner side wall of the flow path (110) is provided with the protrusion (111), and the protrusion (111) penetrates the flow path (110) along the length direction of the flow path (110), or the protrusion (111) is arranged in a spiral shape along the length direction of the flow path (110), or the number of the protrusions (111) is plural, and the plural protrusions (111) are arranged at intervals along the length direction of the flow path (110). The harmonica tube according to claim 1.

3. The inner side wall of the flow path (110) is provided with the recess (112), and the recess (112) penetrates the flow path (110) along the length direction of the flow path (110), or the recess (112) is arranged in a spiral shape along the length direction of the flow path (110), or the number of the recesses (112) is plural, and the plural recesses (112) are arranged at intervals along the length direction of the flow path (110). The harmonica tube according to claim 1.

4. The number of the protrusions (111) is plural, and the plural protrusions (111) extend along the length direction of the flow path (110) and are arranged at intervals along the circumferential direction of the flow path (110), or the number of the recesses (112) is plural, and the plural recesses (112) extend along the length direction of the flow path (110) and are arranged at intervals along the circumferential direction of the flow path (110). The harmonica tube according to claim 1.

5. The number of the protrusions (111) is 2, and the two protrusions (111) are arranged on two opposite side portions of the flow path (110). The harmonica tube according to claim 4.

6. A harmonica tube heat exchanger, comprising a collecting tube assembly (200), a terminal collecting tube (300), a connector (400), a temperature equalizing plate (500) to be mounted, and a plurality of harmonica tubes (100) according to any one of claims 1 to 5. The collecting pipe assembly (200) includes a first collecting pipe (210) and a second collecting pipe (220). An inlet (401) of the connector (400) communicates with a first end portion (101) of a part of the harmonica pipes (100) in the plurality of harmonica pipes (100) via the first collecting pipe (210). An outlet (402) of the connector (400) communicates with the first end portion (101) of another part of the harmonica pipes (100) via the second collecting pipe (220). Second end portions (102) of the harmonica pipes (100) communicate with the terminal collecting pipe (300), respectively. A harmonica pipe heat exchanger, wherein a plurality of harmonica pipes (100) are fixedly arranged on the temperature equalizing plate (500). **Claim 7** The harmonica pipe heat exchanger according to claim 6, wherein at least two of the outermost harmonica pipes (100) among the plurality of harmonica pipes (100) communicate with the first collecting pipe (210) in a direction perpendicular to the extending direction of the harmonica pipes (100). **Claim 8** The harmonica pipe heat exchanger according to claim 7, wherein the number of the harmonica pipes (100) is 8. In the direction perpendicular to the extending direction of the harmonica pipes (100), first end portions (101) of the innermost four harmonica pipes (100) communicate with the second collecting pipe (220), respectively. First end portions (101) of the two harmonica pipes (100) located on both sides of the four harmonica pipes (100) communicate with the first collecting pipe (210), respectively. **Claim 9** The first collecting pipe (210) is provided with a plurality of first strip-shaped holes (211) extending along its length direction. The first end portion (101) of the harmonica pipe (100) is fixedly connected to the first strip-shaped hole (211), whereby a plurality of flow paths (110) of the harmonica pipe (100) can communicate with the first collecting pipe (210). And / or the second collecting pipe (220) is provided with a plurality of second strip-shaped holes (221) extending along the length direction of the second collecting pipe (220). The first end portion (101) of the harmonica pipe (100) is fixedly connected to the second strip-shaped hole (221), whereby a plurality of flow paths (110) of the harmonica pipe (100) can communicate with the second collecting pipe (220). and / or the terminal collecting pipe (300) includes a plurality of third strip-shaped holes (301) extending along the length direction of the terminal collecting pipe (300), and the second end portion (102) of the harmonica pipe (100) is fixedly connected to the third strip-shaped holes (301), whereby a plurality of flow paths (110) of the harmonica pipe (100) can communicate with the terminal collecting pipe (300). The harmonica pipe heat exchanger according to any one of claims 6 to 8.

10. A vehicle (1000) comprising a power battery (600), and the vehicle further comprising the harmonica pipe heat exchanger according to any one of claims 6 to 9.

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