Heat dissipation device and battery assembly

Abstract

The present invention relates to the field of new energy, and in particular to a heat dissipation device and a battery assembly; comprising a cold plate, the cold plate being formed with a first end and a second end, N mutually independent first flow channels being formed in the cold plate, the first connecting port of the first flow channel being located on the end surface of the first end, and the second connecting port of the first flow channel being located on the end surface of the second end; a joint, the joint being connected to the first end of the cold plate via a large end; a second flow channel being formed in the joint, the connecting port at one end of the second flow channel having a larger aperture being located on the end surface of the large end, and the connecting port at the other end having a smaller aperture being located on the end surface of the small end; M partition ribs being arranged in the second flow channel, the partition ribs extending from the small end to the large end, the M partition ribs dividing the second flow channel into M+1 mutually independent second sub-flow channels, the first end of the second sub-flow channel facing the small end, and the second end of the second sub-flow channel facing the large end; M and N are both natural numbers greater than 1 to improve the uniformity of the flow of the coolant in the cold plate.

Description

Technical Field

[0001] The present invention relates to the field of new energy, and in particular to a heat dissipation device and a battery assembly. Background Art

[0002] With the continuous development of new energy vehicles, the requirements for their power batteries are becoming increasingly stringent. Power batteries have a direct impact on the range and safety performance of new energy vehicles. Power battery thermal management primarily focuses on maintaining the battery temperature within the ideal operating range, and liquid cooling technology is currently the most common method.

[0003] There are three possible placement options for cold plates within a battery case: bottom, top, and side. Side-mounted cold plates typically utilize a cold plate design with several internal flow channels. Due to the influence of gravity, the coolant is unevenly distributed throughout each flow channel, resulting in uneven flow distribution. This is particularly true with direct cooling, a type of liquid cooling technology. The two-phase refrigerant entering the cold plate is more susceptible to uneven flow distribution due to varying densities, which can affect battery temperature consistency.

[0004] To address the above issues, no effective solutions have been proposed so far. Summary of the Invention

[0005] In order to improve the uniformity of the flow of coolant in the cold plate, a heat dissipation device and a battery assembly are proposed.

[0006] In one aspect, the present invention provides a heat dissipation device, comprising:

[0007] A cold plate having a first end and a second end, wherein the first end is for cooling liquid to flow in, and the second end is for cooling liquid to flow out. The cold plate is arranged vertically, and has N mutually independent first flow channels formed therein along the vertical height of the cold plate, wherein the first communication ports of the N first flow channels are located on the end surface of the first end, and the second communication ports of the N first flow channels are located on the end surface of the second end;

[0008] The joint comprises a liquid inlet joint and a liquid outlet joint, wherein the liquid inlet joint and the liquid outlet joint are respectively formed with a large end and a small end; the liquid inlet joint is connected to the first end of the cold plate via the large end, and the liquid inlet joint is connected to the second end of the cold plate via the large end; a second flow channel is respectively formed in the liquid inlet joint and the liquid outlet joint, and the extension direction of the second flow channel is adapted to the shape of the large end and the small end of the joint in which it is located; the end with a larger diameter of the connecting port of the second flow channel is on the same side as the large end, and the end with a smaller diameter of the connecting port is on the same side as the small end; M partition ribs are provided in the second flow channel, and the partition ribs extend from the small end to the large end, and the M partition ribs divide the second flow channel into M+1 mutually independent second sub-flow channels, the first end of the second sub-flow channel faces the small end, and the second end of the second sub-flow channel faces the large end; M and N are both natural numbers greater than 1;

[0009] The cooling fluid enters the liquid inlet joint from the small end of the liquid inlet joint, and the cooling fluid is diverted by the M partition ribs in the liquid inlet joint and enters the N first flow channels. The cooling fluid flows in the first flow channels and enters the liquid outlet joint and flows out from the small end of the liquid outlet joint.

[0010] Preferably, N mutually independent first flow channels are distributed in a single row along the plate surface of the cold plate, the joint is plate-shaped, and M+1 mutually independent second sub-flow channels are distributed in a single row along the plate surface of the joint; the second end of the second sub-flow channel is connected to the first flow channel.

[0011] Preferably, the diameter of the second sub-channel close to the small end is smaller than the diameter of the second sub-channel close to the large end.

[0012] Preferably, on a cross section parallel to the plate surface of the joint and passing through the partition rib, from the first end of the second flow channel to the second end of the second flow channel, the inner wall of the second flow channel includes two opposite first flow sections, two opposite second flow sections and two opposite third flow sections in sequence;

[0013] The distance between the two first flow segments is smaller than the distance between the two third flow segments; the connection between the first flow segment and the second flow segment is a convex arc segment, and the connection between the second flow segment and the third flow segment is a concave arc segment.

[0014] Preferably, the number of the partition ribs M=4, and from one side of the joint to the other side, there are the first partition rib, the second partition rib, the third partition rib and the fourth partition rib in order;

[0015] The first partition rib includes, from the small end to the large end, a first flow guide section A, a first flow guide section B, and a first flow guide section C; the second partition rib includes, from the small end to the large end, a second flow guide section A, a second flow guide section B, and a second flow guide section C; the third partition rib includes, from the small end to the large end, a third flow guide section A, a third flow guide section B, and a third flow guide section C; the fourth partition rib includes, from the small end to the large end, a fourth flow guide section A, a fourth flow guide section B, and a fourth flow guide section C;

[0016] The first guide A section, the second guide A section, the third guide A section and the fourth guide A section are parallel to each other, and the first guide A section, the second guide A section, the third guide A section and the fourth guide A section divide the end of the second flow channel located at the small end into five equal parts; the first guide C section and the second guide C section are bent in directions away from each other, and the third guide C section and the fourth guide C section are bent in directions away from each other.

[0017] Preferably, the symmetry plane between the two first flow segments is used as a reference plane; the two second flow segments are symmetrical about the reference plane, the two third flow segments are symmetrical about the reference plane, and the two concave arc segments are symmetrical about the reference plane;

[0018] The first partition rib and the fourth partition rib are symmetrical with respect to the reference plane, and the second partition rib and the third partition rib are symmetrical with respect to the reference plane.

[0019] Preferably, there are two joints, including a first joint and a second joint, the first joint is connected to the first end of the cold plate, and the second joint is connected to the second end of the cold plate.

[0020] In a second aspect, the present invention further provides a battery assembly, comprising the heat dissipation device and a battery pack;

[0021] The first end and the second end of the cold plate are formed opposite to each other at two ends of the cold plate; the cold plate includes a first cold section, a second cold section and a third cold section in sequence from the first end to the second end;

[0022] The first cold section and the third cold section extend toward the same side of the second cold section, and a gap is formed between the first cold section and the second cold section; when a battery is placed in the gap, the battery contacts the cold plate and can conduct the generated heat to the cold plate.

[0023] Preferably, the end portion of the first end is offset toward one side of the interval, and the end portion of the second end is offset toward one side of the interval.

[0024] Preferably, the battery assembly includes a plurality of heat dissipation devices arranged side by side and adjacent to each other, and among two adjacent heat dissipation devices, the first cold section of one heat dissipation device is abutted against the second cold section of the other heat dissipation device, and the first joint of one heat dissipation device is adjacent to the second joint of the other heat dissipation device.

[0025] Preferably, the battery assembly is further provided with a first header and a second header, the first header is formed into a first header, and the second header is formed into a second header;

[0026] The small end of each first connector is connected in parallel to the first header, and the small end of each second connector is connected in parallel to the second header;

[0027] When the coolant enters from the first header, the coolant flows through the first joint, the cold plate, and the second joint of each heat sink at the same time, and then gathers in the second header and flows out; when the coolant enters from the second header, the coolant flows through the second joint, the cold plate, and the first joint of each heat sink at the same time, and then gathers in the first header and flows out.

[0028] Preferably, a first shunt pipe is connected to the small end of the first joint, one end of the first shunt pipe is connected to the small end of the first joint, and the other end is connected to the first collecting pipe; a second shunt pipe is connected to the small end of the second joint, one end of the second shunt pipe is connected to the small end of the second joint, and the other end is connected to the second collecting pipe.

[0029] The present invention arranges multiple first flow channels in the cold plate to evenly distribute the cooling fluid in the cold plate, and allows the cooling fluid to more evenly enter the multiple first flow channels in the cold plate through multiple second sub-flow channels in the joint, thereby improving cooling uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the cold plate structure according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the first flow channel in the cold plate according to an embodiment of the present invention;

[0032] Figure 3 This is a first schematic diagram of the second flow channel in the joint according to an embodiment of the present invention;

[0033] Figure 4 This is a second schematic diagram of the second flow channel in the joint according to an embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of a heat dissipation device provided with a battery according to an embodiment of the present invention.

[0035] The drawings described herein are used to provide further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0036] In the accompanying drawings: 1 - cold plate; 101 - first end; 102 - second end; 103 - first flow channel; 2 - connector; 201 - large end; 202 - small end; 203 - second flow channel; 204 - partition rib; 2031 - second sub-flow channel; 2051 - first flow segment; 2052 - second flow segment; 2053 - third flow segment; 2061 - convex arc segment; 2062 - concave arc segment; 2041 - first partition rib; 2042 - second partition rib; 2043 - third partition rib; 2044 - fourth partition rib; 3011 - first guide A segment; 3012 - first guide B segment Section; 3013-first guide C section; 3021-second guide A section; 3022-second guide B section; 3023-second guide C section; 3031-third guide A section; 3032-third guide B section; 3033-third guide C section; 3041-fourth guide A section; 3042-fourth guide B section; 3043-fourth guide C section; 1041-first cold section; 1042-second cold section; 1043-third cold section; 401-first header; 402-second header; 501-first diverter pipe; 502+-second diverter pipe. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0038] It should be noted that the terms "first," "second," and so on, in the present description, claims, and drawings are used to distinguish similar items and are not necessarily used to describe a specific order or precedence; "front end" and "back end" are relative. It should be understood that the terms used in this manner are interchangeable where appropriate, such that the embodiments of the present invention described herein can be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0039] The present invention relates to the field of new energy, and in particular to a heat dissipation device and a battery assembly. With the continuous development of new energy vehicles, the requirements for power batteries in new energy vehicles are becoming higher and higher. Power batteries are directly related to the cruising range and safety performance of new energy vehicles. The thermal management of power batteries mainly maintains the temperature of the power batteries between ideal operating temperatures, and liquid cooling technology is currently a more common method. There are three ways to place the cold plate in the battery box, namely at the bottom, top and side of the battery. The side-arranged cold plate usually takes the form of a cold plate with several flow channels inside; due to the influence of gravity, the coolant is unevenly distributed in each flow channel, resulting in uneven diversion. In particular, when using the direct cooling method in liquid cooling technology, the two-phase refrigerant entering the cold plate is more prone to uneven diversion due to different densities, which will affect the temperature consistency of the battery.

[0040] In view of the above problems, the present invention proposes a heat dissipation device; on the one hand, Figure 1-5As shown, the cold plate 1 is formed with a first end 101 and a second end 102, wherein the first end 101 is used for the coolant to flow in, and the second end 102 is used for the coolant to flow out, the cold plate 1 is arranged vertically, and N mutually independent first flow channels 103 are formed inside it along the vertical height of the cold plate 1, the first communication ports of the N first flow channels 103 are located on the end surface of the first end 101, and the second communication ports of the N first flow channels 103 are located on the end surface of the second end 102; the joint 2 includes a liquid inlet joint 2 and a liquid outlet joint 2, the liquid inlet joint 2 and the liquid outlet joint 2 are respectively formed with a large end 201 and a small end 202; the liquid inlet joint 2 is connected to the first end 101 of the cold plate 1 through the large end 201, and the liquid inlet joint 2 is connected to the second end 102 of the cold plate 1 through the large end 201; a second flow channel 203 is respectively formed in the liquid inlet joint 2 and the liquid outlet joint 2, and the extension direction of the second flow channel 203 is the same as that of the joint 2 where it is located The shapes of the large end 201 and the small end 202 are adapted to each other; the end with the larger diameter of the communication port of the second flow channel 203 is on the same side as the large end 201, and the end with the smaller diameter of the communication port is on the same side as the small end 202; M partition ribs 204 are provided in the second flow channel 203, and the partition ribs 204 extend from the small end 202 to the large end 201. The M partition ribs 204 divide the second flow channel 203 into M+1 mutually independent second sub-flow channels 2031. The second sub-flow channels 2031 are connected to the second sub-flow channels 2031. The first end 101 of the second sub-channel 2031 faces the small end 202, and the second end 102 of the second sub-channel 2031 faces the large end 201. M and N are both natural numbers greater than 1. The cooling fluid enters the liquid inlet connector 2 from the small end 202. The cooling fluid is divided by M partition ribs 204 within the liquid inlet connector 2 and enters the N first channels 103. The cooling fluid flows within the first channels 103 and enters the liquid outlet connector 2, out of the small end 202 of the outlet connector 2. The cooling fluid enters the second channel 203 through the small end 202 of the connector 2 and, under the action of the partition ribs 204, enters the multiple second sub-channels 2031. This makes the cooling fluid more evenly distributed within the connector 2. The evenly distributed cooling fluid enters the multiple first channels 103 to cool the cold plate 1.

[0041] Preferably, Figure 2-4 As shown, N mutually independent first flow channels 103 are distributed in a single row along the plate surface of the cold plate 1, the joint 2 is plate-shaped, and M+1 mutually independent second sub-flow channels 2031 are distributed in a single row along the plate surface of the joint 2; the second end 102 of the second sub-flow channel 2031 is connected to the first flow channel 103.

[0042] The single-row distribution enables the cooling fluid in the flow channel to fully exchange heat with the outer surface of the cold plate 1, thereby improving the cooling efficiency.

[0043] Preferably, Figure 3-4As shown, the diameter of the second sub-channel 2031 near the small end 202 is smaller than the diameter of the end near the large end 201. With one end larger and the other smaller, when fluid enters through the small end 202, the cross-section of the small end 202 is smaller. The cooling fluid fills the entire small end 202 after entering. Once the cooling fluid fills the small end 202, it can enter the second sub-channel 2031 more evenly, effectively preventing the upper portion of the second sub-channel 2031 from failing to enter due to gravity.

[0044] Preferably, Figure 3-4 As shown, on a cross section parallel to the plate surface of the joint 2 and passing through the partition 204, from the first end 101 of the second flow channel 203 to the second end 102 of the second flow channel 203, the inner wall of the second flow channel 203 includes two opposite first flow segments 2051, two opposite second flow segments 2052 and two opposite third flow segments 2053 in sequence; the distance between the two first flow segments 2051 is smaller than the distance between the two third flow segments 2053; the connection between the first flow segment 2051 and the second flow segment 2052 is a convex arc segment 2061, and the connection between the second flow segment 2052 and the third flow segment 2053 is a concave arc segment 2062.

[0045] The convex arc segment 2061 and the concave arc segment 2062 allow multiple flow segments to extend smoothly, which is beneficial for the flow of cooling fluid in the joint 2.

[0046] Preferably, Figure 3-4As shown, the number of the partition ribs 204 is M=4, and from one side of the joint 2 to the other side, there are the first partition rib 2041, the second partition rib 2042, the third partition rib 2043 and the fourth partition rib 2044; the first partition rib 2041 includes the first flow guide A section 3011, the first flow guide B section 3012 and the first flow guide C section 3013 in sequence from the small end 202 to the large end 201; the second partition rib 2042 includes the second flow guide A section 3021, the second flow guide B section 3022 and the second flow guide C section 3023 in sequence from the small end 202 to the large end 201; the third partition rib 2043 includes the third flow guide A section 3031, the third flow guide B section 3032 and the third flow guide C section 3033 in sequence from the small end 202 to the large end 201; the fourth The partition rib 2044 includes, from the small end 202 to the large end 201, a fourth guide A section 3041, a fourth guide B section 3042 and a fourth guide C section 3043; the first guide A section 3011, the second guide A section 3021, the third guide A section 3031 and the fourth guide A section 3041 are parallel to each other, and the first guide A section 3011, the second guide A section 3021, the third guide A section 3031 and the fourth guide A section 3041 divide the end of the second flow channel 203 located at the small end 202 into five equal parts; the first guide C section 3013 and the second guide C section 3023 are bent in directions away from each other, and the third guide C section 3033 and the fourth guide C section 3043 are bent in directions away from each other.

[0047] The plurality of partition ribs 204 are parallel to each other at the small end 202, which is conducive to the uniform entry of the cooling fluid into the plurality of second sub-channels 2031. The plurality of second sub-channels 2031 are bent toward one end of the large end 201 through the first guide C section 3013 and the second guide C section 3023 in directions away from each other, and the third guide C section 3033 and the fourth guide C section 3043 are bent in directions away from each other, so that the cooling fluid can enter the first channel 103 uniformly when discharged from the second sub-channel 2031.

[0048] Preferably, Figure 3-4 As shown, the symmetric plane between the two first flow segments 2051 is used as the reference plane; the two second flow segments 2052 are symmetrical about the reference plane, the two third flow segments 2053 are symmetrical about the reference plane, and the two concave arc segments 2062 are symmetrical about the reference plane;

[0049] The first partition rib 2041 and the fourth partition rib 2044 are symmetrical with respect to the reference plane, and the second partition rib 2042 and the third partition rib 2043 are symmetrical with respect to the reference plane.

[0050] Preferably, there are two connectors 2, including a first connector 2 and a second connector 2. The first connector 2 is connected to the first end 101 of the cold plate 1, and the second connector 2 is connected to the second end 102 of the cold plate 1. The connector 2 can have various forms, and the small end 202 can be in the form of a circular hole to facilitate connection with a component that fills the cold plate 1 with cooling fluid.

[0051] Second, as Figure 5 As shown, the present invention also provides a battery assembly, including a battery pack and a heat dissipation device;

[0052] The first end 101 and the second end 102 of the cold plate 1 are formed opposite to each other at the two ends of the cold plate 1; the cold plate 1 includes a first cold section 1041, a second cold section 1042 and a third cold section 1043 in sequence from the first end 101 to the second end 102;

[0053] First cold segment 1041 and third cold segment 1043 extend toward the same side of second cold segment 1042, with a gap formed between first cold segment 1041 and second cold segment 1042. The battery pack is positioned within the gap, allowing the batteries to contact cold plate 1 and transfer heat to it. Placing the batteries within the gap evenly places both sides of the batteries in contact with the cold plate 1, enhancing the cooling effect of the cold plate 1 on the batteries.

[0054] Preferably, Figure 5 As shown, the end of the first end 101 is offset toward one side of the gap, and the end of the second end 102 is offset toward one side of the gap; the battery assembly includes multiple heat sinks arranged side by side, and in two adjacent heat sinks, the first cold section 1041 of one heat sink is close to the second cold section 1042 of the other heat sink, and the first connector 2 of one heat sink is adjacent to the second connector 2 of the other heat sink. In this way, the batteries can be divided into multiple groups and placed in multiple heat sinks. To facilitate the connection of the connector 2, the two ends of the cold plate 1, that is, the end where the first connector 2 is installed and the end where the second connector 2 is installed, can be offset toward one side of the gap, that is, offset toward one side close to each other; after the offset is close to each other, a gap is formed between the first end 101 of one and the second end 102 of the other in the two adjacent heat sinks, which facilitates the installation of the connector 2 and prevents interference between the two connectors 2.

[0055] Preferably, the battery assembly is further provided with a first header 401 and a second header 402, wherein the first header 401 is formed into a first header, and the second header 402 is formed into a second header; the small end 202 of each first connector 2 is connected in parallel with the first header, and the small end 202 of each second connector 2 is connected in parallel with the second header;

[0056] When coolant enters through the first header, it simultaneously flows through the first connector 2 of each heat sink, the cold plate 1, and the second connector 2 before being collected in the second header and flowing out. When coolant enters through the second header, it simultaneously flows through the second connector 2 of each heat sink, the cold plate 1, and the first connector 2 before being collected in the first header and flowing out. The simultaneous flow of cooling fluid into and out of different heat sinks reduces the flow path of the cooling fluid within the cold plate 1, helps reduce the pressure drop of the cooling fluid within the first flow channel 103, and reduces the temperature difference across the cold plate 1. This helps maintain similar temperatures for different batteries in the same battery assembly, making battery management easier. The cooling fluid can enter the cold plate 1 through the first connecting pipe and be discharged through the second connecting pipe, or it can enter the cold plate 1 through the second connecting pipe and be discharged through the first connecting pipe. In other words, the cooling fluid can flow in both directions within the cold plate 1.

[0057] Preferably, a first shunt tube 501 is connected to the small end 202 of the first connector 2. One end of the first shunt tube 501 is connected to the small end 202 of the first connector 2, and the other end is connected to the first header. A second shunt tube 502 is connected to the small end 202 of the second connector 2. One end of the second shunt tube 502 is connected to the small end 202 of the second connector 2, and the other end is connected to the second header. The cooling fluid can be the most economical water, or a two-phase refrigerant such as Freon. When charged into the cold plate 1, it is in liquid form, absorbs heat, and then rises in temperature to become gaseous, absorbing more heat during the transition from liquid to gas.

[0058] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included within the spirit and scope of the appended claims.

Claims

1. A heat dissipation device, characterized in that: include: A cold plate having a first end and a second end, wherein the first end is for cooling liquid to flow in, and the second end is for cooling liquid to flow out. The cold plate is arranged vertically, and has N mutually independent first flow channels formed therein along the vertical height of the cold plate, wherein the first communication ports of the N first flow channels are located on the end surface of the first end, and the second communication ports of the N first flow channels are located on the end surface of the second end; The joint comprises a liquid inlet joint and a liquid outlet joint, wherein the liquid inlet joint and the liquid outlet joint are respectively formed with a large end and a small end; the liquid inlet joint is connected to the first end of the cold plate via the large end, and the liquid outlet joint is connected to the second end of the cold plate via the large end; a second flow channel is respectively formed in the liquid inlet joint and the liquid outlet joint, and the extension direction of the second flow channel is adapted to the shape of the large end and the small end of the joint in which it is located; the end with a larger diameter of the connecting port of the second flow channel is on the same side as the large end, and the end with a smaller diameter of the connecting port is on the same side as the small end; M partition ribs are provided in the second flow channel, and the partition ribs extend from the small end to the large end, and the M partition ribs divide the second flow channel into M+1 mutually independent second sub-flow channels, the first end of the second sub-flow channel faces the small end, and the second end of the second sub-flow channel faces the large end; M and N are both natural numbers greater than 1; The cooling fluid enters the liquid inlet joint from the small end of the liquid inlet joint, is divided by the M partition ribs in the liquid inlet joint, and then enters the N first flow channels. The cooling fluid flows in the first flow channels and enters the liquid outlet joint and flows out from the small end of the liquid outlet joint. The first partition rib, the second partition rib, the third partition rib and the fourth partition rib are sequentially arranged from one side of the joint to the other side; The first partition rib includes, from the small end to the large end, a first flow guide section A, a first flow guide section B, and a first flow guide section C; the second partition rib includes, from the small end to the large end, a second flow guide section A, a second flow guide section B, and a second flow guide section C; the third partition rib includes, from the small end to the large end, a third flow guide section A, a third flow guide section B, and a third flow guide section C; the fourth partition rib includes, from the small end to the large end, a fourth flow guide section A, a fourth flow guide section B, and a fourth flow guide section C; The first guide C segment and the second guide C segment are bent in directions away from each other, the third guide C segment and the fourth guide C segment are bent in directions away from each other, the first guide C segment and the fourth guide C segment are bent in directions away from each other, and the second guide C segment and the third guide C segment are bent in directions approaching each other.

2. The heat dissipation device according to claim 1, characterized in that: N mutually independent first flow channels are distributed in a single row along the plate surface of the cold plate, the joint is plate-shaped, and M+1 mutually independent second sub-flow channels are distributed in a single row along the plate surface of the joint; the second end of the second sub-flow channel is connected to the first flow channel.

3. The heat dissipation device according to claim 2, characterized in that: The diameter of the second sub-channel close to the small end is smaller than the diameter of the second sub-channel close to the large end.

4. The heat dissipation device according to claim 3, characterized in that: On a cross section parallel to the plate surface of the joint and passing through the partition rib, from the first end to the second end of the second flow channel, the inner wall of the second flow channel includes two opposite first flow sections, two opposite second flow sections, and two opposite third flow sections in sequence; The distance between the two first flow segments is smaller than the distance between the two third flow segments; the connection between the first flow segment and the second flow segment is a convex arc segment, and the connection between the second flow segment and the third flow segment is a concave arc segment.

5. The heat dissipation device according to claim 4, characterized in that: The first guide section A, the second guide section A, the third guide section A and the fourth guide section A are parallel to each other, and the first guide section A, the second guide section A, the third guide section A and the fourth guide section A divide the second flow channel at the small end into five equal parts.

6. The heat dissipation device according to claim 5, characterized in that: The symmetry plane between the two first flow segments is used as a reference plane; the two second flow segments are symmetrical about the reference plane, the two third flow segments are symmetrical about the reference plane, and the two concave arc segments are symmetrical about the reference plane; The first partition rib and the fourth partition rib are symmetrical with respect to the reference plane, and the second partition rib and the third partition rib are symmetrical with respect to the reference plane.

7. The heat dissipation device according to claim 6, characterized in that: There are two joints, including a first joint and a second joint, the first joint is connected to the first end of the cold plate, and the second joint is connected to the second end of the cold plate.

8. A battery assembly, characterized in that: The heat dissipation device comprises a battery pack and the heat dissipation device according to any one of claims 1 to 7; the battery pack is arranged in contact with the cold plate of the heat dissipation device.

9. The battery assembly according to claim 8, characterized in that The first end and the second end of the cold plate are formed opposite to each other at two ends of the cold plate; the cold plate includes a first cold section, a second cold section and a third cold section in sequence from the first end to the second end; The first cold segment and the third cold segment extend toward the same side of the second cold segment, and a gap is formed between the first cold segment and the second cold segment; the battery pack is disposed in the gap and contacts the cold plate.

10. The battery assembly according to claim 9, characterized in that An end portion of the first end is offset toward one side of the gap, and an end portion of the second end is offset toward one side of the gap.

11. The battery assembly according to claim 10, characterized in that The battery assembly includes a plurality of heat dissipation devices arranged side by side and adjacent to each other. Among two adjacent heat dissipation devices, the first cold section of one heat dissipation device is in contact with the second cold section of the other heat dissipation device, and the first joint of one heat dissipation device is adjacent to the second joint of the other heat dissipation device.

12. The battery assembly according to claim 11, wherein: The battery assembly is further provided with a first header and a second header; The small end of each first connector is connected in parallel to the first header, and the small end of each second connector is connected in parallel to the second header; When the coolant enters from the first header, the coolant flows through the first joint, the cold plate, and the second joint of each heat sink at the same time, and then gathers in the second header and flows out; when the coolant enters from the second header, the coolant flows through the second joint, the cold plate, and the first joint of each heat sink at the same time, and then gathers in the first header and flows out.

13. The battery assembly according to claim 12, wherein: A first shunt pipe is connected to the small end of the first joint, one end of the first shunt pipe is connected to the small end of the first joint, and the other end is connected to the first collecting pipe; a second shunt pipe is connected to the small end of the second joint, one end of the second shunt pipe is connected to the small end of the second joint, and the other end is connected to the second collecting pipe.

Images