WO2024104319A1 - Cooling structure of cooler, cooler, battery pack and vehicle - Google Patents

Abstract

A vehicle having a cooling structure of a cooler, a cooler and a battery pack. The cooling structure comprises a plurality of cooling flow channels, wherein each cooling flow channel comprises a branching section and a converging section; each branching section is provided with a plurality of branching nodes so as to separate the branching section into a plurality of sections of flow channels; each section of flow channel comprises at least one sub-flow channel; the branching nodes are configured to branch each sub-flow channel into a plurality of sub-flow channels; the sub-flow channels of two adjacent sections of flow channels are separated by means of the branching node; and the converging section is configured to merge the plurality of sub-flow channels of the last section of flow channel.

Description

Cooling structure of cooler, cooler, battery pack and vehicle

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to the Chinese patent application filed on March 10 , 2023 , with application number: 202320541982.X, and invention name: " Cooling structure of cooler, cooler, battery pack and vehicle ", all contents of which are incorporated by reference into this application.

This application also claims priority to the Chinese patent application filed on November 16 , 2022 , with application number: 202223052088.0 , and invention name: " Heat Exchange Plate and Battery Pack ", all contents of which are incorporated by reference into this application.

Technical Field

The present application relates to a cooling structure of a cooler, a cooler, a battery pack and a vehicle.

Background technique

In the related art, a cooling channel is integrated on the battery pack. In order to meet the structural strength of the channel and the lightweight of the battery pack, the cooling channel adopts a smaller channel size design, but this design will bring the following problems:

(1) When the cooling channel is mainly direct cooling, the refrigerant resistance loss is large, and the saturation temperature of the refrigerant in the cooling channel changes greatly, resulting in uneven surface temperature of the cooling channel, which is not conducive to the temperature consistency of the battery;

(2) When the cooling channel is mainly liquid-cooled (the working fluid is generally ethylene glycol/water solution), due to the huge pressure loss, the entire vehicle needs to be equipped with a high-lift circulation pump to meet the flow requirements, which reduces versatility.

Summary of the invention

The technical problem to be solved by the present application is: to address the problem of large resistance loss in the existing cooling flow channel, and to provide a cooling structure of a cooler, a cooler, a battery pack and a vehicle.

In order to solve the above technical problems, on the one hand, an embodiment of the present application provides a cooling structure of a cooler, comprising a liquid inlet, a liquid outlet and a plurality of cooling channels, wherein two ends of the cooling channels are respectively connected to the liquid inlet and the liquid outlet;

The cooling channel includes:

A flow dividing section, the flow dividing section is connected to the liquid inlet, and a plurality of flow dividing nodes are arranged on the flow dividing section to divide the flow dividing section into a plurality of flow channels, each flow channel includes at least one sub-flow channel, and the flow dividing node is used to divide each sub-flow channel into a plurality of flow channels, along the flow direction of the working medium in the flow dividing section, the sub-flow channels of two adjacent flow channels are separated by the flow dividing nodes, and the number of sub-flow channels of the latter flow channel is greater than the number of sub-flow channels of the former flow channel;

The confluence section is connected to the liquid outlet and is used to merge multiple sub-flow channels of the last section of the flow channel and flow them to the liquid outlet.

Optionally, the diverter section includes a first diverter section and a second diverter section, the first diverter section and the converging section are connected at two ends of the second diverter section, and the shape of the converging section is consistent with the shape of the first diverter section.

Optionally, the first flow diversion section includes a first flow channel, a second flow channel and a third flow channel, and the flow diversion node includes a first flow diversion node, a second flow diversion node, a third flow diversion node and a fourth flow diversion node;

The first flow diversion node is arranged between the first flow channel and the liquid inlet, the second flow diversion node is arranged between the first flow channel and the second flow channel, the third flow diversion node is arranged between the second flow channel and the third flow channel, and the fourth flow diversion node is arranged between the third flow channel and the second diversion segment.

Optionally, the first flow channel includes at least one first sub-flow channel, the second flow channel includes a plurality of second sub-flow channels, the third flow channel includes a plurality of third sub-flow channels, the second flow branching section includes a plurality of fourth sub-flow channels, the first flow branching node is used to branch at least one first sub-flow channel from the liquid inlet, the second flow branching node is used to divide each first sub-flow channel into a plurality of second sub-flow channels, the third flow branching node is used to divide each second sub-flow channel into a plurality of third sub-flow channels, and the fourth flow branching node is used to divide each third sub-flow channel into a plurality of fourth sub-flow channels;

The number of the first sub-flow channels, the number of the second sub-flow channels, the number of the third sub-flow channels and the number of the fourth sub-flow channels increase in sequence.

Optionally, the plurality of cooling channels are arranged in a circle from the inside to the outside, the lengths of the plurality of cooling channels increase from the inside to the outside, and the outermost cooling channels are arranged along the outer edge of the cooler.

Optionally, the length of the first sub-channel is smaller than that of the second sub-channel, and the lengths of the plurality of second sub-channels increase from inside to outside, and are the same as the lengths of the plurality of fourth sub-channels connected to the same third sub-channel.

Optionally, the diameters of all the first sub-channels decrease from the inside to the outside, the diameters of all the second sub-channels increase from the inside to the outside, and the diameters of all the fourth sub-channels are the same.

Optionally, the cooler comprises a plurality of first spoiler structures and a plurality of second spoiler structures, the first spoiler structures are arranged on the first sub-channel of the innermost cooling channel, and the second spoiler structures are arranged at the diversion nodes.

Optionally, the first spoiler structure is a first protrusion protruding toward the interior of the first sub-channel, and the second spoiler structure includes a second protrusion, a third protrusion and a fourth protrusion, the second protrusion is arranged at the second divergence node and protrudes toward the interior of the first sub-channel, the third protrusion is arranged at the third divergence node and protrudes toward the interior of the second sub-channel, and the fourth protrusion is arranged at the fourth divergence node and protrudes toward the interior of the third sub-channel.

On the other hand, an embodiment of the present application provides a cooler, including a flow channel plate, a flat plate, a cooler joint and a cooling structure of the above-mentioned cooler, wherein the flow channel plate is provided with a flow channel groove recessed in a direction away from the flat plate, the flow channel plate and the flat plate are laminated and connected, and the flat plate can cover the opening of the flow channel groove to define a cooling flow channel;

The liquid inlet and the liquid outlet are arranged on the cooler joint, the flat plate is provided with a first hole and a second hole, the liquid inlet is connected to the inlet of the cooling channel via the first hole, and the liquid outlet is connected to the outlet of the cooling channel via the second hole.

On the other hand, an embodiment of the present application provides a battery pack including the above-mentioned cooler.

On the other hand, an embodiment of the present application provides a vehicle, including the above-mentioned battery pack.

In the cooling structure of the cooler provided in the embodiment of the present application, the closer to the liquid inlet, the greater the flow rate of the working fluid. A plurality of cooling channels are provided, so that the working fluid flowing in from the liquid inlet is diverted into multiple streams. The diversion can quickly reduce the flow rate in a single pipe and divert the flow. The pressure loss is positively correlated with the flow rate, thereby reducing the pressure loss. A plurality of diversion nodes are provided on each cooling channel. Each cooling channel can be diverted multiple times through the diversion nodes, which can also reduce the pressure loss. The flow rates of each section of the channel are basically the same, and the cooling effects are also roughly the same, thereby avoiding the problem of uneven surface temperature of the cooling channel, thereby improving the temperature consistency of the battery.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a cooling structure of a cooler provided in one embodiment of the present application;

FIG2 is an enlarged schematic diagram of point A in FIG1 ;

FIG3 is an enlarged schematic diagram of point B in FIG1 ;

FIG4 is an exploded view of a cooler provided in one embodiment of the present application;

FIG5 is a cross-sectional view of a flow channel provided in an embodiment of the present application;

FIG6 is a schematic diagram of a cooler on a battery pack provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of a vehicle provided in accordance with an embodiment of the present application.

The reference numerals in the specification are as follows:

100. Cooler;

1. first flow section; 11. first flow channel; 111. first sub-flow channel; 12. second flow channel; 121. second sub-flow channel; 13. third flow channel; 131. third sub-flow channel;

2. second flow section; 21. fourth sub-flow channel;

3. Confluence section;

4. Dividing node; 41. First diverting node; 42. Second diverting node; 43. Third diverting node; 44. Fourth diverting node;

51, first protrusion; 52, second protrusion; 53, third protrusion; 54, fourth protrusion;

6. flow channel plate; 61. flow channel groove;

7. Flat plate; 71. First hole; 72. Second hole;

8. Cooler joint; 81. Liquid inlet; 82. Liquid outlet;

200, battery pack;

300. Vehicle.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects solved by this application clearer, The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

As shown in Figures 1 to 5, an embodiment of the present application provides a cooling structure of a cooler, wherein a liquid inlet 81, a liquid outlet 82 and a plurality of cooling channels are provided on the cooler 100, and two ends of the cooling channel are respectively connected to the liquid inlet 81 and the liquid outlet 82, and the working fluid enters the cooling channel from the liquid inlet 81 and flows out from the liquid outlet 82.

The cooling channel includes a diverter section and a converging section 3 , which are connected to each other. One end of the diverter section away from the converging section 3 is connected to the liquid inlet 81 , and one end of the converging section 3 away from the diverter section is connected to the liquid outlet 82 .

A plurality of flow splitting nodes 4 are provided on the flow splitting section, and the flow splitting section can be divided into a plurality of flow passages by the plurality of flow splitting nodes 4. Each flow passage includes at least one sub-flow passage. All sub-flow passages in the same flow passage are connected in parallel, and the number of sub-flow passages in each flow passage is different. The flow splitting nodes 4 are used to split each sub-flow passage into a plurality of sub-flow passages, that is, each flow splitting node 4 will connect at least three sub-flow passages. Along the flow direction of the working medium in the flow splitting section, the sub-flow passages of two adjacent flow passages are separated by the flow splitting nodes 4, and a sub-flow passage is connected between two adjacent flow splitting nodes 4. Since each sub-flow passage in the previous flow passage will be split, the number of sub-flow passages in the next flow passage is greater than the number of sub-flow passages in the previous flow passage, and the multiple sub-flow passages in the last flow passage are merged through the converging section 3 and flow to the liquid outlet 82.

The cooler provided in the embodiment of the present application has a larger flow rate of the working fluid as it is closer to the liquid inlet 81. A plurality of cooling channels are provided so that the working fluid flowing in from the liquid inlet 81 is diverted into multiple streams. The diversion can quickly reduce the flow rate in a single pipe. The pressure loss is positively correlated with the flow rate, thereby reducing the pressure loss. A plurality of diversion nodes 4 are provided on each cooling channel. The diversion nodes 4 can be used to divert each cooling channel multiple times, which can also reduce the pressure loss. The flow rates of each section of the channel are basically the same, and the cooling effects are also roughly the same, thereby avoiding the problem of uneven surface temperature of the cooling channel, thereby improving the temperature consistency of the battery.

In one embodiment, the number of diversions is limited by the total flow rate and the width of the cooling channel. The more diversions there are, the less flow rate of a single sub-channel will be. When there are too few diversion nodes, a wider cooling channel needs to be designed, which will cause greater resistance loss along the way and deformation of the cooler substrate, making it difficult to meet the requirements of direct cooling. A large number of diversion nodes will increase the difficulty of processing. The number of diversion nodes needs to be determined based on the flow simulation design and the cooling channel processing process limitations.

In one embodiment, as shown in Figures 1 and 4, multiple diversion nodes 4 are arranged at intervals on the diversion section along the flow direction of the working fluid, wherein the first diversion node 4 is arranged at the entrance of the cooling channel, so that the working fluid entering from the liquid inlet 81 is diverted through the first diversion node 4 when entering the cooling channel, which can quickly reduce the flow rate of the working fluid and help reduce pressure loss.

In one embodiment, as shown in FIG. 1 and FIG. 4 , the flow diversion section includes a first flow diversion section 1 and a second flow diversion section 2, and the flow diversion nodes 4 are arranged at intervals on the first flow diversion section 1, wherein the first flow diversion node 4 is arranged at the inlet of the first flow diversion section 1, and the last flow diversion node 4 is arranged at the outlet of the first flow diversion section 1, and the second flow diversion section 2 is obtained by diverting the last flow diversion node 4. The first flow diversion section 1 and the confluence section 3 are symmetrically connected at both ends of the second flow diversion section 2, and the shape of the confluence section 3 is consistent with that of the first flow diversion section 1. Since the first flow diversion section 1 and the confluence section 3 adopt a completely symmetrical structure, the liquid inlet 81 and the liquid outlet 82 of the cooler 100 will not affect its flow characteristics or cooling performance.

In one embodiment, as shown in Fig. 1 and Fig. 4, the first flow diversion section 1 includes a first flow channel 11, a second flow channel 12 and a third flow channel 13, and the flow diversion node 4 includes a first flow diversion node 41, a second flow diversion node 42, a third flow diversion node 43 and a fourth flow diversion node 44. The first flow diversion node 41 is arranged between the first flow channel 11 and the liquid inlet 81, the second flow diversion node 42 is arranged between the first flow channel 11 and the second flow channel 12, the third flow diversion node 43 is arranged between the second flow channel 12 and the third flow channel 13, and the fourth flow diversion node 44 is arranged between the third flow channel 13 and the second flow diversion section 2.

It should be noted that the first diversion node 41 is set at the entrance of the cooling channel, and the first diversion nodes 41 of multiple cooling channels overlap. The working fluid enters from the liquid inlet 81, and when flowing through the first diversion node 41, the working fluid is divided into multiple streams, and each stream flows into a corresponding cooling channel. The number of diversions at the first diversion node 41 is the number of cooling channels. The second diversion node 42, the third diversion node 43 and the fourth diversion node 44 are each provided with multiple, and the first diversion section 1 of each cooling channel continues to be diverted through the second diversion node 42, the third diversion node 43 and the fourth diversion node 44.

In one embodiment, as shown in FIGS. 1 to 4, the first section of the flow channel 11 includes at least one first sub-flow channel. Channel 111, the second section of the channel 12 includes a plurality of second sub-channels 121 connected in parallel, the third section of the channel 13 includes a plurality of third sub-channels 131 connected in parallel, the second branch section 2 includes a plurality of fourth sub-channels 21 connected in parallel, the first branch node 41 is used to branch out at least one first sub-channel 111 from the liquid inlet 81, the second branch node 42 is used to divide each first sub-channel 111 into a plurality of second sub-channels 121, the first branch node 41 is set at the entrance of the cooling channel, the first sub-channel 111 connects the first branch node 41 and the second branch node 42, the third branch node 43 is used to divide each second sub-channel 121 into a plurality of third sub-channels 131, the second sub-channel 121 connects the second branch node 42 and the third branch node 43, the fourth branch node 44 is used to divide each third sub-channel 131 into a plurality of fourth sub-channels 21, and the third sub-channel 131 connects the third branch node 43 and the fourth branch node 44. The number of first sub-channels 111, the number of second sub-channels 121, the number of third sub-channels 131 and the number of fourth sub-channels 21 increase sequentially, the number of first divergence nodes 41 is one, and the number of second divergence nodes 42, the number of third divergence nodes 43 and the number of fourth divergence nodes 44 increase sequentially, and the number of second divergence nodes 42 is consistent with the number of first sub-channels 111, the number of third divergence nodes 43 is consistent with the number of second sub-channels 121, and the number of fourth divergence nodes 44 is consistent with the number of third sub-channels 131.

In a preferred embodiment, as shown in Figures 1 to 3 and 4, after the working fluid enters the cooling channel from the liquid inlet 81 of the cooler joint 8, it passes through 4 diversion nodes in total, among which the first diversion node 41 divides the working fluid into 4 streams, and the second diversion node 42, the third diversion node 43 and the fourth diversion node 44 divide the working fluid into 2 each time, and finally form 32 parallel branches.

Specifically, the working fluid is divided into four streams at the first diversion node 41, and four cooling channels are provided. Among them, in each cooling channel, on the first diversion section 1, one first sub-channel 111 is provided, and correspondingly, one second diversion node 42 is provided, and the second diversion node 42 diverts the first sub-channel 111 into two second sub-channels 121. Corresponding to the number of the second sub-channels 121, two third diversion nodes 43 are provided, and each third diversion node 43 diverts the second sub-channel 121 into two third sub-channels 131, thereby obtaining four parallel third sub-channels 131. Corresponding to the number of the third sub-channels 131, four fourth diversion nodes 44 are provided, and each fourth diversion node 44 diverts the third sub-channel 131 into two fourth sub-channels 21, thereby obtaining eight parallel fourth sub-channels 21 in each cooling channel, and the cooler 100 has a plurality of third diversion nodes 43. Finally, 32 fourth sub-flow channels 21 connected in parallel are obtained.

The shape of the confluence section 3 is consistent with that of the first diversion section 1. The confluence section 3 undergoes a total of four confluences starting from the fourth sub-channel 21. The confluence section 3 is provided with a first confluence node, a second confluence node, a third confluence node and a fourth confluence node. Among them, the first confluence node, the second confluence node and the third confluence node merge two streams of working fluid into one stream each time. The fourth confluence node is provided at the outlet of the cooling channel. The fourth confluence node merges four streams of working fluid into one stream, and gradually merges the 32 fourth sub-channels 21 into one stream, and flows out through the outlet of the cooling channel.

In one embodiment, as shown in FIG. 1 , a plurality of cooling channels are arranged in a circle from the inside to the outside, and the lengths of the plurality of cooling channels increase from the inside to the outside. The outermost cooling channels are arranged along the outer edge of the cooler 100 .

In one embodiment, as shown in FIG. 1 and FIG. 4 , the length of the first sub-channel 111 is less than the length of the second sub-channel 121 . When the working fluid flows stably, the total working fluid flow rate flowing in the cooling channel is conserved. After the flow is divided through a flow dividing node 4 , each flow is equal and the flow rate is evenly divided. When the fluid continues to pass through a flow dividing node 4 , the flow rate is further evenly divided. Therefore, the closer to the liquid inlet 81 , the fewer nodes the working fluid passes through, and the higher the flow rate. By qualitatively analyzing the relationship between flow resistance, flow rate, and pipe diameter, the pressure loss is positively correlated with the square of the flow rate. The larger the flow rate, the greater the pressure loss of the working fluid. Therefore, shortening the length of the high flow section as much as possible can reduce the flow resistance as much as possible. In the cooling channel, the first sub-channel 111 is connected to the liquid inlet 81, and its flow rate is the largest in the cooling channel. By shortening the length of the first sub-channel 111 as much as possible, the flow resistance can be reduced.

When the flow rate is fixed, for liquid cooling or direct cooling, in general, the longer the pipeline flow, the smaller the cross-sectional area of the pipeline, and the greater the flow resistance along the way. If there are structures such as protrusions and bends, local energy loss will also occur, thereby generating local flow resistance. In this application, the flow channels are mostly designed in parallel, and the lengths of the parallel branches vary greatly. For parallel pipelines, the pressure drops at both ends of different pipe sections are always equal. To ensure uniform distribution of flow, the resistance characteristics of each branch can be balanced in two ways.

In one embodiment, in order to ensure uniform distribution of flow, the resistance characteristics of each branch can be balanced by designing a variety of pipe diameters. A variety of different flow channel sizes are used. In a group of parallel pipes, for a relatively large flow path, The longer branch is designed with a larger diameter, which can effectively reduce its resistance and increase the flow through the branch.

The lengths of the multiple second sub-channels 121 of the second section of the channel 12 increase from the inside to the outside, and are the same as the lengths of the multiple fourth sub-channels 21 connected to the same third sub-channel 131. The multiple fourth sub-channels 21 branched off from one third sub-channel 131 are recorded as a group, and the lengths of the multiple groups of fourth sub-channels 21 in the second branch section 2 increase from the inside to the outside.

Since the multiple cooling channels on the cooler 100 are sequentially surrounded, the lengths of all the first sub-channels 111 on the cooler decrease from the inside to the outside, and the diameters decrease from the inside to the outside. The lengths of all the second sub-channels 121 increase from the inside to the outside, and the diameters increase from the inside to the outside. By increasing the diameters of the first sub-channels 111 and the second sub-channels 121 with longer flow paths, the resistance can be reduced, the flow rate in the channel can be increased, and the flow distribution on the cooler 100 can be more balanced.

The third sub-channel 131 and the fourth sub-channel 21 are far away from the liquid inlet 81 and do not belong to the high flow section. The diameters of all third sub-channels 131 can be consistent, or different diameters can be designed according to the length of the channel. The diameters of all fourth sub-channels are consistent.

In a preferred embodiment, as shown in Figure 1, four cooling channels are provided, namely a first cooling channel, a second cooling channel, a third cooling channel and a fourth cooling channel. The first cooling channel is located at the innermost side, the second cooling channel surrounds the outer side of the first cooling channel, the third cooling channel surrounds the outer side of the second cooling channel, and the fourth cooling channel surrounds the outer side of the third cooling channel. The lengths of the first cooling channel, the second cooling channel, the third cooling channel and the fourth cooling channel increase successively, and the fourth cooling channel is provided at a position close to the edge of the cooler 100.

In any cooling channel, the length of the first sub-channel 111 is smaller than the length of the second sub-channel 121, and the lengths of the two second sub-channels 121 of the second section channel 12 increase from the inside to the outside, that is, the closer to the edge of the cooler 100, the longer the second sub-channel 121. The third section channel 13 has four third sub-channels 131. Along the direction from the inside to the outside, the shape and length of the first third sub-channel 131 are consistent with the formation and length of the third third sub-channel 131, and the shape and length of the remaining two third sub-channels 131 are consistent. The second diversion section 2 has eight fourth sub-channels 21, and the two fourth sub-channels 21 branched from one third sub-channel 131 are recorded as a group. The second diversion section 2 has a total of four groups of fourth sub-channels 21, the same The lengths of the two fourth sub-flow channels 21 in one group are the same, and the lengths of the four groups of fourth sub-flow channels 21 increase sequentially from the inside to the outside.

In the cooler 100, there are four first sub-channels 111, and the lengths of the four first sub-channels 111 decrease from the inside to the outside, and the diameters decrease from the inside to the outside. There are eight second sub-channels 121, and the lengths of the eight second sub-channels 121 increase from the inside to the outside, and the diameters increase from the inside to the outside. The diameters of the 32 parallel fourth sub-channels 21 remain the same.

In one embodiment, as shown in Figures 2, 3 and 4, in order to ensure uniform distribution of flow, the resistance characteristics of each branch can be balanced by adding local spoiler structures. For cooling channels with shorter flow paths, arc-shaped protrusions can be selectively added to cause sudden contraction and expansion of the fluid flow cross-section, so as to increase local energy losses and thus reduce the flow.

The cooler 100 includes multiple first spoiler structures and multiple second spoiler structures. The first spoiler structure is arranged on the first sub-channel 111 of the innermost cooling channel, that is, the first spoiler structure is arranged on the first sub-channel 111 of the first cooling channel, and the first spoiler structure is a first protrusion 51 protruding toward the inside of the first sub-channel 111.

Multiple cooling channels are surrounded in sequence, and the lengths of the multiple cooling channels increase from the inside to the outside. The lengths of the four cooling channels between the liquid inlet 81 and the liquid outlet 82 are different, but the roughness, pipe diameter and other factors affecting the flow resistance are consistent. Then the flow rate will be more distributed to the cooling channel with a shorter length, that is, more distributed to the first cooling channel. Therefore, in order to balance the flow rate, a local first protrusion 51 is made on the first cooling channel. The first protrusion 51 can cause a sudden contraction and expansion of the internal flow cross-section of the first sub-channel 111, increase turbulence, form local pressure loss, and avoid the flow rate being distributed more to the first cooling channel, so that the flow in the four cooling channels is more balanced.

In one embodiment, as shown in Figures 2 and 3, the second spoiler structure is arranged at the diversion node 4, which can eliminate the influence of the inlet position of the flow channel. If the second spoiler structure is not added, it will cause an imbalance in the flow on both sides of the flow channel. The second spoiler structure is essentially to balance the resistance characteristics on both sides of the flow channel.

The second spoiler structure includes a second protrusion 52, a third protrusion 53 and a fourth protrusion 54. The second protrusion 52, the third protrusion 53 and the fourth protrusion 54 are provided in plurality. The second protrusion 52 is provided at the second flow dividing node 42. The third protrusion 53 is arranged at the third diverging node 43 and protrudes toward the inside of the second sub-channel 121 . The fourth protrusion 54 is arranged at the fourth diverging node 44 and protrudes toward the inside of the third sub-channel 131 .

In one embodiment, as shown in Figures 4 and 5, the embodiment of the present application provides a cooler 100, including a flow channel plate 6, a flat plate 7 and a cooler joint 8, the flow channel plate 6 is provided with a flow channel groove 61 which is recessed in a direction away from the flat plate 7, the flow channel plate 6 and the flat plate 7 are metal plates, the flow channel groove 61 can be formed by a stamping process, the flow channel plate 6 and the flat plate 7 are laminated and connected, the flat plate 7 is tightly attached to the flow channel plate 6 by welding or bonding, and the flat plate 7 can cover the opening of the flow channel groove 61 to define a cooling channel for the flow of cooling medium.

The shape of the flow channel groove 61 determines the pressure and stress distribution it can withstand. When the flow channel grooves 61 of different shapes are subjected to the same pressure, the stress distribution they withstand will be different, which will affect their structural strength. In this embodiment, through structural design simulation, a suitable flow channel cross-sectional shape is selected so that the cooler 100 can meet the requirements of no deformation under 3.2Mpa pressure and bursting pressure greater than 9Mpa under conventional material and plate thickness conditions, and has the advantages of low flow resistance and high structural strength. When the working fluid in the cooler 100 is a refrigerant such as R134a, R1234yf, etc., the flow channel of the cooler 100 will not rupture or deform. When the working fluid in the cooler 100 is a liquid with a high viscosity such as water, ethylene glycol or cooling oil, the flow resistance is relatively low, which can meet the needs of large flow circulation, and can meet the needs of direct cooling and direct heating of the whole vehicle and liquid cooling and liquid heating, thereby improving the versatility of the cooler 100.

Preferably, the flow channel 61 has a bottom wall and side walls symmetrically connected to both sides of the bottom wall, the bottom wall is arranged parallel to the flat plate 7, and one end of the side wall and the bottom wall and the other end of the side wall and the flat plate 7 are smoothly connected by an arc. The area of the flow channel plate 6 without the flow channel 61 is attached to the flat plate 7.

The liquid inlet 81 and the liquid outlet 82 are arranged on the cooler joint 8, and can be connected to the cooling circuit of the whole vehicle through the cooler joint 8. The flat plate 7 is provided with a first hole 71 and a second hole 72, the liquid inlet 81 is connected to the inlet of the cooling channel via the first hole 71, and the liquid outlet 82 is connected to the outlet of the cooling channel via the second hole 72.

On the other hand, as shown in FIG6 , the embodiment of the present application provides a battery pack 200, including the cooler 100 of the above embodiment. The battery pack 200 includes a tray and a battery module, and the cooler 100 is connected to the tray. Together, they define a space for accommodating the battery module. Multiple holes are distributed on the outer edges of the flow channel plate 6 and the flat plate 7 to achieve riveting or bolting with the tray. Through flow simulation design, the cold plate has better temperature and flow uniformity, and the maximum flow deviation is less than 10%, making the battery temperature more consistent.

On the other hand, as shown in FIG. 7 , an embodiment of the present application provides a vehicle 300 , including the battery pack 200 of the above embodiment.

The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims (12)

1. A cooling structure of a cooler, characterized in that it comprises a liquid inlet (81), a liquid outlet (82) and a plurality of cooling channels, wherein two ends of the cooling channels are respectively connected to the liquid inlet (81) and the liquid outlet (82);

   Wherein, the cooling channel comprises:

   a flow dividing section, the flow dividing section being connected to the liquid inlet (81); a plurality of flow dividing nodes (4) being arranged on the flow dividing section so as to divide the flow dividing section into a plurality of flow channels, each flow channel comprising at least one sub-flow channel, the flow dividing node (4) being used to divide each sub-flow channel into a plurality of flow channels, and along the flow direction of the working medium in the flow dividing section, the sub-flow channels of two adjacent flow channels are separated by the flow dividing node (4), and the number of sub-flow channels of the latter flow channel is greater than the number of sub-flow channels of the former flow channel;

   A confluence section (3), the confluence section (3) is connected to the liquid outlet (82) and is used to converge the multiple sub-flow channels of the last section of the flow channel and flow them to the liquid outlet (82).
2. The cooling structure of the cooler according to claim 1, wherein the diverter section comprises a first diverter section (1) and a second diverter section (2), the first diverter section (1) and the converging section (3) are connected at both ends of the second diverter section (2), and the shape of the converging section (3) is consistent with the shape of the first diverter section (1).
3. The cooling structure of the cooler according to claim 2, wherein the first flow diversion section (1) includes a first flow channel (11), a second flow channel (12) and a third flow channel (13), and the flow diversion node (4) includes a first flow diversion node (41), a second flow diversion node (42), a third flow diversion node (43) and a fourth flow diversion node (44);

   The first flow dividing node (41) is arranged between the first flow channel (11) and the liquid inlet (81), the second flow dividing node (42) is arranged between the first flow channel (11) and the second flow channel (12), the third flow dividing node (43) is arranged between the second flow channel (12) and the third flow channel (13), and the fourth flow dividing node (44) is arranged between the third flow channel (13). and between the second diversion section (2).
4. The cooling structure of a cooler according to claim 3, wherein the first section of the flow channel (11) includes at least one first sub-flow channel (111), the second section of the flow channel (12) includes a plurality of second sub-flow channels (121), the third section of the flow channel (13) includes a plurality of third sub-flow channels (131), the second flow branching section (2) includes a plurality of fourth sub-flow channels (21), the first flow branching node (41) is used to branch at least one of the first sub-flow channels (111) from the liquid inlet (81), the second flow branching node (42) is used to divide each of the first sub-flow channels (111) into a plurality of the second sub-flow channels (121), the third flow branching node (43) is used to divide each of the second sub-flow channels (121) into a plurality of the third sub-flow channels (131), and the fourth flow branching node (44) is used to divide each of the third sub-flow channels (131) into a plurality of the fourth sub-flow channels (21);

   The number of the first sub-flow channels (111), the number of the second sub-flow channels (121), the number of the third sub-flow channels (131), and the number of the fourth sub-flow channels (21) increase in sequence.
5. The cooling structure of the cooler as claimed in claim 4, wherein the plurality of cooling channels are arranged in a circle from the inside to the outside, the lengths of the plurality of cooling channels increase from the inside to the outside, and the outermost cooling channels are arranged along the outer edge of the cooler.
6. The cooling structure of the cooler as claimed in claim 5, wherein the length of the first sub-channel (111) is smaller than the length of the second sub-channel (121), the lengths of the plurality of second sub-channels (121) increase sequentially from the inside to the outside, and the plurality of fourth sub-channels (21) with the same length are connected to the same fourth diversion node (44).
7. The cooling structure of the cooler as claimed in claim 5, wherein the diameters of all the first sub-channels (111) decrease from the inside to the outside, the diameters of all the second sub-channels (121) increase from the inside to the outside, and the diameters of all the fourth sub-channels (21) are consistent.
8. The cooling structure of the cooler as claimed in claim 5, wherein the cooler comprises a plurality of first spoiler structures and a plurality of second spoiler structures, the first spoiler structures being arranged on the first sub-channel (111) of the innermost cooling channel, and the second spoiler structures being arranged at the diversion node (4).
9. The cooling structure of the cooler according to claim 8, wherein the first spoiler structure is a first protrusion (51) protruding toward the inside of the first sub-channel (111), and the second spoiler structure includes a first protrusion (51) protruding toward the inside of the first sub-channel (111). A second protrusion (52), a third protrusion (53) and a fourth protrusion (54), wherein the second protrusion (52) is arranged at the second branch node (42) and protrudes toward the interior of the first sub-channel (111), the third protrusion (53) is arranged at the third branch node (43) and protrudes toward the interior of the second sub-channel (121), and the fourth protrusion (54) is arranged at the fourth branch node (44) and protrudes toward the interior of the third sub-channel (131).
10. A cooler (100), comprising a flow channel plate (6), a flat plate (7), a cooler joint (8), and a cooling structure of the cooler according to any one of claims 1 to 9, wherein the flow channel plate (6) is provided with a flow channel groove (61) which is recessed in a direction away from the flat plate (7), the flow channel plate (6) and the flat plate (7) are laminated and connected, and the flat plate (7) can cover the opening of the flow channel groove (61) to define the cooling flow channel;

    The liquid inlet (81) and the liquid outlet (82) are arranged on the cooler joint (8); a first hole (71) and a second hole (72) are arranged on the flat plate (7); the liquid inlet (81) is connected to the inlet of the cooling channel via the first hole (71); and the liquid outlet (82) is connected to the outlet of the cooling channel via the second hole (72).
11. A battery pack (200), comprising the cooler (100) according to claim 10.
12. A vehicle (300), comprising the battery pack (200) of claim 11.