Power battery heat exchanger, power battery system and electric vehicle

Abstract

The present disclosure relates to a power battery heat exchanger, a power battery system and an electric vehicle, wherein the power battery heat exchanger comprises a joint, a first header assembly and a second header assembly arranged at intervals along a first direction, and a plurality of harmonica tubes arranged between the first header assembly and the second header assembly and arranged at intervals along a second direction; the harmonica tube comprises a first end and a second end opposite to each other; the first header assembly comprises a first header and a second header, the inlet of the joint is respectively connected with the first ends of some harmonica tubes through the first header, and the outlet of the joint is respectively connected with the first ends of other harmonica tubes through the second header; the second ends of the plurality of harmonica tubes are connected through the second header assembly. By setting the first header assembly as the first header and the second header, the number of pipelines is reduced, the space utilization rate is improved, the ineffective heat exchange is avoided, the heat exchange efficiency of the heat exchanger is improved, and the material cost is saved at the same time.

Description

Technical Field

[0001] The present disclosure relates to the technical field of power batteries, and in particular, to a power battery heat exchanger, a power battery system and an electric vehicle. Background Art

[0002] The power battery in electric vehicles is a component with strict temperature requirements. If the battery works at high or low temperatures for a long time, it will reduce the service life of the power battery and cause safety hazards. Therefore, how to maintain the working temperature of the power battery at a suitable temperature is a difficult problem. In the relevant battery thermal management technology, the battery direct cooling technology is used to connect the battery heat exchanger in parallel with the car's air conditioning system, and use the refrigerant in the air conditioning to absorb or release heat in the power battery heat exchanger, thereby maintaining the power battery at a stable and suitable temperature.

[0003] Existing power battery direct cooling heat exchangers such as Figure 1 and Figure 2 As shown, the heat exchanger is mainly welded by a harmonica tube 10, a manifold assembly 20, a tail manifold 30, a joint 40 and a temperature equalizing plate 50. The joint 40 is connected to the air conditioning system of the whole vehicle. The joint 40, the manifold assembly 20, the tail manifold 30 and the harmonica tube 40 are welded together to form a heat exchanger with a flow channel inside. The temperature equalizing plate 50 is welded and fixed to the harmonica tube 10. Since the heat exchanger is now connected to the whole vehicle with a two-hole joint, and the harmonica tube is a component in the whole heat exchanger that plays a role in heat exchange with the battery, in order to maximize the capacity of the heat exchanger, the harmonica tube covers the power battery, so the connection between the joint and the harmonica tube must be transitioned by a manifold assembly. The manifold assembly 20 of the heat exchanger is composed of 9 round tubes and two tees. The manifold assembly cannot be in direct contact with the battery, and the battery system cannot be heated or cooled, resulting in heat or cold loss, reducing the heat exchange efficiency of the heat exchanger. Summary of the invention

[0004] The purpose of the present disclosure is to provide a power battery heat exchanger, a power battery system and an electric vehicle. The power battery heat exchanger reduces the number of pipelines of the first collecting tube assembly by setting the first collecting tube assembly as the first collecting tube and the second collecting tube, has a high space utilization rate, avoids ineffective heat exchange, improves the heat exchange efficiency of the heat exchanger, and saves material costs.

[0005] In order to achieve the above-mentioned object, the present disclosure provides a power battery heat exchanger in a first aspect, comprising a joint, a first header assembly and a second header assembly spaced apart along a first direction, and a plurality of harmonica pipes disposed between the first header assembly and the second header assembly and spaced apart along a second direction;

[0006] The harmonica pipe comprises a first end and a second end opposite to each other; the first manifold assembly comprises a first manifold and a second manifold, the inlet of the joint is respectively connected with the first ends of some of the harmonica pipes through the first manifold, and the outlet of the joint is respectively connected with the first ends of other parts of the harmonica pipes through the second manifold;

[0007] The second ends of the plurality of harmonica pipes are connected through the second header assembly.

[0008] Optionally, the first direction is perpendicular to the second direction.

[0009] Optionally, along the second direction, at least the two outermost harmonica tubes are connected to the first collecting pipe.

[0010] Optionally, the number of the harmonica pipes is an even number, and the number of the harmonica pipes connected to the first header is equal to the number of the harmonica pipes connected to the second header.

[0011] Optionally, there are eight harmonica tubes, and in the second direction, the innermost four harmonica tubes are respectively connected to the second collecting pipe, and the other four harmonica tubes located outside the four harmonica tubes are respectively connected to the first collecting pipe.

[0012] Optionally, there are eight harmonica tubes, and in the second direction, the outermost two harmonica tubes and the innermost two harmonica tubes are respectively connected to the first collecting pipe, and the other four harmonica tubes are respectively connected to the second collecting pipe.

[0013] Optionally, the second header assembly includes a third header and a fourth header;

[0014] The third collecting pipe is connected to the second ends of four adjacent harmonica pipes; the fourth collecting pipe is connected to the second ends of another four adjacent harmonica pipes.

[0015] Optionally, the power battery heat exchanger further includes a temperature averaging plate disposed on one side of the plurality of harmonica tubes, and the plurality of harmonica tubes are fixedly connected to the temperature averaging plate.

[0016] Optionally, the first manifold is provided with a plurality of first strip-shaped holes extending along its length direction on the side thereof, and the harmonica pipe is fixedly connected to the first strip-shaped holes so that the plurality of flow channels of the harmonica pipe can communicate with the first manifold;

[0017] And / or, the second manifold is laterally provided with a plurality of second strip-shaped holes extending along its length direction, and the harmonica pipe is fixedly connected to the second strip-shaped holes so that the plurality of flow channels of the harmonica pipe can be communicated with the second manifold.

[0018] Optionally, the joint includes a liquid inlet connected to the inlet and a liquid outlet connected to the outlet, the liquid inlet is connected to the first header through a first connecting pipe, and the liquid outlet is connected to the second header through a second connecting pipe.

[0019] In a second aspect of the present disclosure, a power battery system is further provided, comprising a power battery. The power battery system further comprises the power battery heat exchanger mentioned above, wherein the power battery heat exchanger is arranged on the surface of the power battery for heating and / or cooling the power battery.

[0020] According to a third aspect of the present disclosure, an electric vehicle is provided, comprising the above-mentioned power battery system.

[0021] Through the above technical solution, that is, the power battery heat exchanger disclosed in the present invention, by setting the first manifold assembly as the first manifold and the second manifold, and respectively connecting with the inlet and outlet of the joint, so that the refrigerant entering from the inlet directly enters part of the harmonica tubes after passing through the first manifold, and then flows into the remaining harmonica tubes after being converged by the second manifold assembly, and finally flows out from the outlet of the joint after passing through the second manifold to form a loop, and multiple harmonica tubes exchange heat with the power battery through the temperature averaging plate to achieve heating or cooling of the power battery. In the power battery heat exchanger disclosed in the present invention, the first manifold assembly only includes the first manifold and the second manifold, which reduces the number of pipelines of the first manifold assembly as a whole, improves space utilization, avoids ineffective heat exchange, improves the heat exchange efficiency of the heat exchanger, and saves material costs at the same time.

[0022] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0024] Figure 1 It is a structural schematic diagram of a power battery heat exchanger in the related art;

[0025] Figure 2 It is a schematic diagram of the top view of the structure of a power battery heat exchanger in the related art;

[0026] Figure 3 is a diagram showing an installation structure of a power battery heat exchanger and a power battery according to an exemplary embodiment of the present disclosure;

[0027] Figure 4 is based on Figure 3 Exploded view of the power battery heat exchanger in Figure 1;

[0028] Figure 5 is a schematic diagram of the flow of refrigerant inside a power battery heat exchanger according to an exemplary embodiment of the present disclosure;

[0029] Figure 6 is a schematic diagram of the flow of refrigerant inside a power battery heat exchanger according to another exemplary embodiment of the present disclosure;

[0030] Figure 7 It is a schematic diagram of the partial structure of a joint of a power battery heat exchanger shown in an exemplary embodiment of the present disclosure;

[0031] Figure 8 is a structural schematic diagram of a first header assembly of a power battery heat exchanger shown in an exemplary embodiment of the present disclosure;

[0032] Fig. 9 It is a schematic diagram of the partial structure of a harmonica tube of a power battery heat exchanger shown in an exemplary embodiment of the present disclosure.

[0033] Description of Reference Numerals

[0034] 10-harmonica tube; 20-collector assembly; 30-tail collector; 40-connector; 50-temperature plate;

[0035] 100-harmonica tube; 101-first end; 102-second end; 110-flow channel; 200-first collector assembly; 210-first collector; 211-first strip hole; 220-second collector; 221-second strip hole; 230-first connecting pipe; 240-second connecting pipe; 300-second collector assembly; 310-third collector; 320-fourth collector; 400-connector; 401-inlet; 402-outlet; 403-liquid inlet; 404-liquid outlet; 500-temperature averaging plate; 600-power battery; 610-battery positive electrode; 620-battery negative electrode. DETAILED DESCRIPTION

[0036] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0037] In the present disclosure, unless otherwise specified, directional words such as "up, down, left, right" generally refer to the up, down, left, right corresponding to the drawings; "inside and outside" refer to the "inside and outside" relative to the corresponding component's own contour; "X" refers to the first direction; "Y" refers to the second direction. In addition, the terms "first", "second", "third", "fourth", etc. used in the present disclosure are intended to distinguish one element from another and do not have order or importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same figure numbers in different drawings represent the same or similar elements. The above definitions are only used to explain and illustrate the present disclosure and should not be construed as limitations on the present disclosure.

[0038] like Figures 1 to 9 As shown, in order to achieve the above-mentioned purpose, the first aspect of the present disclosure provides a power battery heat exchanger, including a joint 400, a temperature averaging plate 500, a first header assembly 200 and a second header assembly 300 arranged at intervals along a first direction X, and a plurality of harmonica tubes 100 arranged between the first header assembly 200 and the second header assembly 300 and arranged at intervals along a second direction Y, wherein the plurality of harmonica tubes 100 are connected to the temperature averaging plate 500; wherein the first direction X is perpendicular to the second direction Y; the harmonica tubes 100 00 includes a first end 101 and a second end 102 opposite to each other; the first collecting pipe assembly 200 includes a first collecting pipe 210 and a second collecting pipe 220, the inlet 401 of the joint 400 is respectively connected with the first ends 101 of some harmonica tubes 100 through the first collecting pipe 210, and the outlet 402 of the joint 400 is respectively connected with the first ends 101 of other harmonica tubes 100 through the second collecting pipe 220; the second ends 102 of multiple harmonica tubes 100 are connected through the second collecting pipe assembly 300.

[0039] Through the above technical scheme, that is, the power battery heat exchanger disclosed in the present invention, by setting the first manifold assembly 200 as the first manifold 210 and the second manifold 220, and respectively connecting with the inlet 401 and the outlet 402 of the connector 400, so that the refrigerant entering from the inlet 401 directly enters part of the harmonica tubes 100 after passing through the first manifold 210, and then flows into the remaining harmonica tubes 100 after being converged by the second manifold assembly 300, and finally flows out from the outlet 402 of the connector 400 after passing through the second manifold 220, forming a loop, and multiple harmonica tubes 100 exchange heat with the power battery 600 through the temperature equalizing plate 500, thereby realizing heating or cooling of the power battery 600. In the power battery heat exchanger disclosed in the present invention, the first manifold assembly 200 only includes a first manifold 210 and a second manifold 220, which reduces the number of pipelines of the first manifold assembly 200 as a whole, has a higher space utilization rate, avoids ineffective heat exchange, improves the heat exchange efficiency of the heat exchanger, and saves material costs.

[0040] It should be noted that the inlet 401 and the outlet 402 of the joint 400 are used for the inflow and outflow of the refrigerant in the entire heat exchanger. The harmonica tube 100 has multiple flow channels 110 inside. The joint 400, the first header 210, the second header 220, the harmonica tube 100 and the second header assembly 300 are mutually embedded and welded, and the channels inside each component are interconnected to form the flow channel 110 for the refrigerant to circulate in the heat exchanger. In order to increase the heat exchange area of ​​the entire heat exchanger, the temperature averaging plate 500 is welded to the harmonica tube 100.

[0041] It should be noted that the first direction X is perpendicular to the second direction Y, that is, the extension direction of the multiple harmonica tubes 100 is perpendicular to the extension direction of the first header 210, the second header 220 and the second header assembly 300, which is beneficial to the uniformity of the diversion of the refrigerant from the header to the harmonica tubes 100.

[0042] In some embodiments, the first direction X and the second direction Y may also be at an angle, but not vertically arranged, which may also meet the above-mentioned connection requirements. For example, the harmonica pipe 100 may extend along the first direction X, the first header 210 and the second header 220 may extend along the second direction Y, and the angle between the first direction X and the second direction Y is 15°, 30°, 45°, 60°, 75°, 105°, 120°, 135°, 150°, 165°, etc.

[0043] like Figure 3 As shown, the power battery 600 adopts a long battery horizontal arrangement scheme, and 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 is arranged in the direction of the battery negative electrode 620, which is consistent with the second direction Y of the heat exchanger. When the power battery 600 is at a high temperature, the temperature of the positive and negative ends of the power battery 600 will be higher than the temperature in the middle. Therefore, when the power battery 600 is cooled, the first thing to consider is the cooling of the two ends of the power battery 600.

[0044] In some embodiments, along the second direction Y, at least the two outermost harmonica pipes 100 are connected to the first manifold 210. Figure 5 and Figure 6As shown, at least the first ends 101 of the two harmonica tubes 100 on the left and right are connected to the first header 210, as the first channel for the refrigerant to enter, and have the best cooling effect; the first ends 101 of the other harmonica tubes 100 located in the middle are connected to the second header 220, as the last channel for the refrigerant to flow out, and their cooling effect is slightly worse than that of the two outermost harmonica tubes 100, so as to meet the actual use requirements of the power battery 600 and reduce the temperature difference of the power battery 600. It should be noted that the second ends 102 of the multiple harmonica tubes 100 are connected through the second header assembly 300, so that the multiple harmonica tubes 100 are connected to form the flow of the refrigerant.

[0045] According to the temperature characteristics of the power battery 600, which has a higher temperature at both ends and a relatively lower temperature in the middle, the direction of the refrigerant in the harmonica tube 100 of the power battery heat exchanger is redesigned. The power battery heat exchanger is connected to the air conditioner, that is, the refrigerant in the air conditioning system enters from the inlet 401 of the joint 400, flows to the first header 210, and then is separated by the first header 210 to the left and right outermost or near-outer harmonica tubes 100, flows back to the second header 220 through the second header assembly and other harmonica tubes 100, and then flows out from the outlet 402 of the joint 400 to the air conditioning system. The heat exchanger is hard-connected in parallel with the air conditioning system of the whole vehicle through the joint 400. When the power battery system needs to be cooled, the air conditioning controller controls the refrigerant to flow to the heat exchanger, which has the effect of cooling the power battery 600.

[0046] Similarly, when the temperature of the power battery 600 is low and needs to be heated, the refrigerant enters from the outlet 402 of the connector 400, passes through the second collecting pipe 220, multiple harmonica tubes 100 in the middle position, and flows back to the first collecting pipe 210 through the second collecting assembly and other harmonica tubes 100 on the outside, and then flows out from the inlet 401 of the connector 400 to the air-conditioning system, thereby realizing power electric heating.

[0047] It should be noted that the first header 210 and the second header 220 may both be aluminum tubes, or other metal materials, such as copper or aluminum alloy.

[0048] In order to further improve the uniformity of cooling and heating of the power battery heat exchanger, Figure 5 and Figure 6As shown, in some examples of the present disclosure, the number of harmonica tubes 100 is an even number, and the number of harmonica tubes 100 connected to the first header 210 is equal to the number of harmonica tubes 100 connected to the second header 220. The flow rate of the refrigerant flowing into the inlet harmonica tube 100 and the refrigerant flowing into the outlet harmonica tube 100 can be kept roughly consistent, that is, when the flow direction of the refrigerant in different harmonica tubes 100 is set according to the characteristics of the power battery 600 to adapt to the different temperatures at both ends and the middle of the power battery 600, the flow rate and pressure drop at various locations on the entire heat exchanger can be kept uniform to a certain extent.

[0049] like Figure 5 As shown, in some embodiments, there are eight harmonica tubes 100, and in the second direction, the innermost four harmonica tubes 100 are respectively connected to the second header 220, and the other four harmonica tubes 100 located outside the four harmonica tubes 100 are respectively connected to the first header 210. Among them, the first ends 101 of the two harmonica tubes 100 located on the leftmost side and the two harmonica tubes 100 located on the rightmost side are respectively connected to the first header 210, the first ends 101 of the four harmonica tubes 100 in the middle are respectively connected to the second header 220, and the second ends 102 of the eight harmonica tubes 100 are respectively connected through the second header assembly 300. During the cooling process, the refrigerant of the air conditioning system enters from the inlet 401 of the joint 400, and flows to the four harmonica tubes 100 on the left and right sides through the first header 210. The refrigerant enters the second header assembly 300 at the second end 102 of the four harmonica tubes 100, and then flows into the second header 220 through the four harmonica tubes 100 located in the middle and connected to the second header assembly 300, and flows back to the air conditioning system through the outlet 402 of the joint 400. During the flow process, the refrigerant first enters the two harmonica tubes 100 on the left and the two harmonica tubes 100 on the right, cooling the two ends of the power battery 600 with a higher temperature so that it can reach a suitable temperature range as quickly as possible, and then the four harmonica tubes 100 located in the middle cool the middle position of the battery, which can also meet the temperature requirements of the power battery 600. During the heating process, the flow direction is just the opposite, that is, the refrigerant enters from the outlet 402 of the joint 400 and flows out from the inlet 401 of the joint 400, so that the battery can be heated. Compared with the related art, the first manifold assembly 200 of the present disclosure simplifies the number of shunt pipes to avoid heat loss. Therefore, the eight harmonica pipes 100 mentioned above can be used in combination with the temperature averaging plate 500 to meet the heat dissipation requirements.

[0050] like Figure 6As shown, in other embodiments, there are eight harmonica tubes 100. In the second direction, the two outermost harmonica tubes 100 and the two innermost harmonica tubes 100 are respectively connected to the first header 210, and the other four harmonica tubes 100 are respectively connected to the second header 220. In the second direction Y, the first ends 101 of the two harmonica tubes 100 located on the leftmost and rightmost sides and the two harmonica tubes located in the middle are respectively connected to the first header 210, while the first ends 101 of the remaining four harmonica tubes 100 are respectively connected to the second header 220, and the second ends 102 of the eight harmonica tubes 100 are respectively connected to the second header assembly 300. During the cooling process, the refrigerant of the air conditioning system enters from the inlet 401 of the joint 400 and flows to the rightmost side through the first header 210. The refrigerant flows into the second header assembly 300 at the second ends 102 of the four harmonica tubes 100, and then flows into the second header assembly 220 through the two harmonica tubes 100 connected to the second header assembly 300 and between the leftmost harmonica tube 100 and the middle harmonica tube 100, and the two harmonica tubes 100 located between the rightmost harmonica tube 100 and the middle harmonica tube 100, and then flows back to the air conditioning system through the outlet 402 of the joint 400. During the flow, the refrigerant first enters the leftmost harmonica tube 100 and the rightmost harmonica tube 100, and cools the two ends of the power battery 600 with higher temperature and the middle position that is not easy to dissipate heat, so that it can reach a suitable temperature range as quickly as possible, and then the other four harmonica tubes 100 cool the position between the two ends and the middle of the battery, so as to further meet the temperature requirements of the power battery 600. During the heating process, the flow direction is just the opposite, that is, the refrigerant enters from the outlet 402 of the connector 400 and flows out from the inlet 401 of the connector 400, so that the battery can be heated, which will not be described in detail here.

[0051] The second manifold assembly 300 may be constructed in any suitable structure, and may be formed by a tube extending along the second side and sealed at both ends, such as but not limited to an aluminum tube. Figure 6As shown, in some embodiments of the present disclosure, the second header assembly 300 includes a third header 310 and a fourth header 320; wherein the third header 310 is connected to the second ends 102 of four adjacent harmonica tubes 100; and the fourth header 320 is connected to the second ends 102 of the other four adjacent harmonica tubes 100. That is, the third header 310 is connected to the second ends 102 of the four harmonica tubes 100 on the left side, and during cooling, the two harmonica tubes 100 on both sides of the four harmonica tubes 100 flow into the third header 310 with refrigerant, and the refrigerant in the third header 310 flows into the two harmonica tubes 100 in the middle; at the same time, the fourth header 320 is connected to the second ends 102 of the four harmonica tubes 100 on the right side, and during cooling, the two harmonica tubes 100 on both sides of the four harmonica tubes 100 flow into the fourth header 320 with refrigerant, and the refrigerant in the fourth header 320 flows into the two harmonica tubes 100 in the middle. It can also be understood that the eight harmonica tubes 100 are divided into two groups, which prevents the refrigerant from converging and affecting the flow distribution in each harmonica tube 100 when flowing into the second manifold assembly 300, thereby further improving the flow stability during cooling or heating.

[0052] In some embodiments, the second manifold assembly 300 may also be a straight tube extending along the second direction, with both ends of the straight tube sealed, and the second ends 102 of the plurality of harmonica tubes 100 are connected to the straight tube at intervals, so that the refrigerant in some harmonica tubes 100 can flow in and out of other harmonica tubes 100. It should be noted that in order to achieve the above-mentioned effect of improving the stability of the internal flow, a blocking seal may be provided in the middle of the straight tube, dividing the straight tube into two sections, wherein the four harmonica tubes 100 on the left are connected to one section, and the four harmonica tubes 100 on the right are connected to the other section, so that the purpose of stabilizing the flow can also be achieved.

[0053] In order to improve the reliability of the connection between the first header 210 and the second header 220 and the harmonica pipe 100, as shown in FIG. Figure 8 and Fig. 9 As shown, in some embodiments of the present disclosure, the first collecting pipe 210 is laterally provided with a plurality of first strip holes 211 extending along its length direction, and the harmonica tube 100 is fixedly connected to the first strip holes 211 so that the plurality of flow channels 110 of the harmonica tube 100 can be connected to the first collecting pipe 210; wherein, the inner side of the first collecting pipe 210 is provided with a plurality of first strip holes 211 corresponding to the width of the harmonica tube 100, and the harmonica tube 100 is embedded in the first strip holes 211 and connected to the first strip holes 211 by welding.

[0054] In some embodiments, the second manifold 220 is provided with a plurality of second strip holes 221 extending along its length direction on its side, and the harmonica pipe 100 is fixedly connected to the second strip holes 221, so that the plurality of flow channels 110 of the harmonica pipe 100 can communicate with the second manifold 220. The inner side of the second manifold 220 is provided with a plurality of second strip holes 221 corresponding to the width of the harmonica pipe 100, and the harmonica pipe 100 is embedded in the second strip holes 221 and connected to the second strip holes 221 by welding.

[0055] It should be noted that if Fig. 9 As shown, one end of the harmonica tube 100 is bent downward relative to the portion connected to the temperature equalizing plate 500, and is connected to the first collector assembly 200, and is used to wrap the power battery 600 when connected to the power battery 600, and the other end can be a straight section, that is, the portion connected to the temperature equalizing plate 500 can be in the same plane, that is, there is no bending, and it is directly connected to the second collector assembly 300.

[0056] The connector 400 may be constructed in any suitable manner, such as Figure 7 and Figure 8 As shown, in some embodiments of the present disclosure, the connector 400 may include an inlet 401, an outlet 402, a liquid inlet 403 communicating with the inlet 401, and a liquid outlet 404 communicating with the outlet 402, the liquid inlet 403 communicating with the first manifold 210 through the first connecting pipe 230, and the liquid outlet 404 communicating with the second manifold 220 through the second connecting pipe 240. The connector 400 is connected to the pipeline of the air conditioning system through its inlet 401 and outlet 402, for example, it can be connected to the cooling and heating pipeline of the vehicle cab, of course, it cannot be connected to other corresponding pipelines that can achieve cooling and heating, so as to achieve heat exchange of the power battery 600.

[0057] In related technologies, such as Figure 1 and Figure 2 As shown, the heat exchanger is mainly welded by a harmonica tube 10, a manifold assembly, a tail manifold, a joint 40 and a temperature equalizing plate 50. The joint 40 is connected to the air-conditioning system of the whole vehicle. The joint 40, the manifold assembly and the harmonica tube 10 are welded together to form a heat exchanger with an internal flow channel. The temperature equalizing plate 50 is welded and fixed to the harmonica tube 10. The manifold assembly includes two connecting pipes, two three-way valves, four diverter pipes, a manifold one and two manifold twos, a total of 9 pipe fittings. The joint 40 is connected to two three-way valves through two connecting pipes, and a three-way valve is connected to two manifold twos through two left and right diverter pipes with diverting functions. A three-way valve is connected to a manifold one through two left and right diverter pipes with diverting functions. As shown Figure 2As shown, the inlet and outlet are integrated on a joint 40. For example, the manifold assembly can be composed of 9 round tubes. The manifold assembly serves as a transition assembly between the joint 40 and the harmonica tubes 10, and plays a role in distributing the flow of the joint 40 to each harmonica tube 10. The flow direction is as follows Figure 2 As shown, the refrigerant flows in from the inlet of the joint 40, and is divided into two left and right flow paths, each flow path is further divided into two flow paths, and finally becomes four flow paths in the manifold 1 to flow to the harmonica tube 10. After the flow path flows to the tail end manifold, it flows back to the manifold 2 of the manifold assembly from the other four harmonica tubes 10, and the four flow paths merge into two flow paths, and then merge into one flow path and flow out from the outlet of the joint.

[0058] Compared with the solutions in the above-mentioned related technologies, the power battery heat exchanger provided by the present invention has a collector assembly in which the number of pipes is reduced from the original 9 to 4, which reduces the material and saves the production cost. At the same time, since the 9 pipes on the original collector assembly are arranged outside the power battery 600, they cannot cool the battery. Now the collector assembly is reduced to 4 pipes, which can reduce ineffective heat exchange and improve the heat exchange efficiency of the heat exchanger.

[0059] In a second aspect of the present disclosure, a power battery system is further provided, including a power battery 600, and the power battery system further includes the above-mentioned power battery heat exchanger, wherein the power battery heat exchanger is arranged on the surface of the power battery 600, and is used to heat and / or cool the power battery 600. Among them, the heater of the power battery 600, that is, the harmonica tube 100 and the temperature averaging plate 500, can be arranged on the upper surface of the power battery 600, and can also be arranged on the lower surface of the power battery 600, so as to achieve cooling or heating of the power battery 600.

[0060] Among them, the directions of both ends of the power battery 600 correspond to the second direction of the power battery heat exchanger, that is, in the second direction, at least two outermost harmonica tubes 100 correspond to the two ends of the power battery 600. When cooling is required, the cooling capacity of both ends of the power battery 600 is improved, and when heating is required, the heating capacity of the middle position of the battery can be improved.

[0061] In a third aspect of the present disclosure, an electric vehicle is further provided, which includes the above-mentioned power battery system. Therefore, the electric vehicle also has the advantages of the above-mentioned power battery system, which will not be elaborated here.

[0062] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0063] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0064] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A power battery heat exchanger, It is characterized in that It comprises a joint (400), a first header assembly (200) and a second header assembly (300) arranged at intervals along a first direction, and a plurality of harmonica pipes (100) arranged between the first header assembly (200) and the second header assembly (300) and arranged at intervals along a second direction; The harmonica tube (100) comprises a first end (101) and a second end (102) opposite to each other; the first manifold assembly (200) comprises a first manifold (210) and a second manifold (220); the inlet (401) of the joint (400) is respectively connected to the first ends (101) of some of the harmonica tubes (100) through the first manifold (210); and the outlet (402) of the joint (400) is respectively connected to the first ends (101) of other parts of the harmonica tubes (100) through the second manifold (220); The second ends (102) of the plurality of harmonica tubes (100) are connected via the second manifold assembly (300); At least two of the harmonica tubes (100) located on the outermost sides are connected to the first current collecting tube (210), one of the two harmonica tubes (100) located on the outermost sides corresponds to the battery positive electrode (610) at one end of the battery, the other corresponds to the battery negative electrode (620) at the other end of the battery, and the remaining harmonica tubes (100) correspond to the middle part of the battery.

2. The power battery heat exchanger according to claim 1, It is characterized in that The first direction is perpendicular to the second direction.

3. The power battery heat exchanger according to claim 1, It is characterized in that The number of the harmonica pipes (100) is an even number, and the number of the harmonica pipes (100) connected to the first header (210) is equal to the number of the harmonica pipes (100) connected to the second header (220).

4. The power battery heat exchanger according to claim 3, It is characterized in that There are eight harmonica tubes (100), and in the second direction, the innermost four harmonica tubes (100) are respectively connected to the second collecting pipe (220), and the other four harmonica tubes (100) located outside the four harmonica tubes (100) are respectively connected to the first collecting pipe (210).

5. The power battery heat exchanger according to claim 3, It is characterized in that There are eight harmonica tubes (100); in the second direction, the outermost two harmonica tubes (100) and the innermost two harmonica tubes (100) are respectively connected to the first collecting pipe (210), and the other four harmonica tubes (100) are respectively connected to the second collecting pipe (220).

6. The power battery heat exchanger according to claim 5, It is characterized in that The second header assembly (300) comprises a third header (310) and a fourth header (320); The third collecting pipe (310) is connected to the second ends (102) of four adjacent harmonica pipes (100); and the fourth collecting pipe (320) is connected to the second ends (102) of another four adjacent harmonica pipes (100).

7. The power battery heat exchanger according to claim 1, It is characterized in that The power battery heat exchanger further comprises a temperature averaging plate (500) arranged on one side of the plurality of harmonica tubes (100), and the plurality of harmonica tubes (100) are fixedly connected to the temperature averaging plate (500).

8. The power battery heat exchanger according to any one of claims 1 to 7, It is characterized in that A plurality of first strip-shaped holes (211) extending along the length direction of the first manifold (210) are provided on the side thereof, and the harmonica tube (100) is fixedly connected to the first strip-shaped holes (211), so that the plurality of flow channels (110) of the harmonica tube (100) can communicate with the first manifold (210); And / or, the second manifold (220) is provided with a plurality of second strip-shaped holes (221) extending along its length direction on the side thereof, and the harmonica tube (100) is fixedly connected to the second strip-shaped holes (221), so that the plurality of flow channels (110) of the harmonica tube (100) can communicate with the second manifold (220).

9. The power battery heat exchanger according to any one of claims 1 to 7, It is characterized in that The joint (400) comprises a liquid inlet (403) connected to the inlet (401) and a liquid outlet (404) connected to the outlet (402); the liquid inlet (403) is connected to the first manifold (210) via a first connecting pipe (230), and the liquid outlet (404) is connected to the second manifold (220) via a second connecting pipe (240).

10. A power battery system, comprising a power battery (600), It is characterized in that The power battery system further comprises a power battery heat exchanger according to any one of claims 1 to 9, wherein the power battery heat exchanger is arranged on a surface of the power battery (600) and is used to heat and / or cool the power battery (600).

11. An electric vehicle, It is characterized in that The electric vehicle includes the power battery system according to claim 10.

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