Liquid cooling plate for battery pack and battery pack

Abstract

The utility model provides a liquid cooling plate for a battery pack and the battery pack, and the liquid cooling plate comprises a plate body which is provided with a liquid inlet and a liquid outlet; the liquid separation cavity is arranged in the plate body and is communicated with the liquid inlet; the two ends of each heat exchange flow channel communicate with the liquid separation cavity and the liquid outlet correspondingly; the liquid cooling plate further comprises a flow dividing part which is arranged in the liquid dividing cavity and located at the position of the liquid inlet, and the flow dividing part is used for dividing a refrigerant entering the liquid dividing cavity so as to guide part of the refrigerant to flow to the heat exchange runner far away from the position of the liquid outlet. According to the liquid cooling plate for the battery pack, due to the arrangement of the flow dividing part, a refrigerant enters the liquid dividing cavity from the liquid inlet and then flows through the flow dividing part, so that a part of the refrigerant flows to the heat exchange runner away from the liquid outlet, the heat exchange effect of the liquid cooling plate is improved, and the heat dissipation effect of the liquid cooling plate is relatively uniform.

Description

Technical Field

[0001] The utility model relates to the field of battery manufacturing, and in particular to a liquid cooling plate for a battery pack and a battery pack. Background Art

[0002] With the development of technology, the performance parameters of battery packs, such as size, power, capacity, and weight, are constantly increasing. As these performance parameters increase, the heat dissipation of the battery modules in the battery pack is also increasing, so the heat dissipation requirements for the battery pack are also getting higher and higher.

[0003] In the prior art, a liquid cooling plate is usually used as the bottom plate of the battery pack, and the battery module is placed on the liquid cooling plate to achieve cooling of the battery module. In the prior art, in order to increase the heat exchange area, multiple parallel heat exchange channels are set inside the cold liquid plate, but the parallel channels are connected in series, which is equivalent to a rotating and extended channel connected between the liquid inlet and the liquid outlet of the liquid cooling plate. After the refrigerant enters the channel, the heat exchange temperature will increase. Therefore, the closer to the downstream of the heat exchange channel, the worse the cooling effect.

[0004] In some other prior arts, in order to improve the heat exchange effect, a liquid separation cavity is set at the liquid inlet, and multiple parallel heat exchange channels are connected simultaneously through the liquid separation cavity, that is, multiple heat exchange channels are connected in parallel. However, there is still a problem that the heat dissipation channels close to the liquid inlet dissipate heat faster, while the heat dissipation channels far from the liquid inlet dissipate heat slower, which reduces the heat exchange efficiency. Utility Model Content

[0005] The utility model aims to at least solve the problem in the prior art that the heat dissipation channel of the liquid cooling plate close to the liquid inlet dissipates heat faster, while the heat dissipation channel far from the liquid inlet dissipates heat slower, and proposes a liquid cooling plate and a battery pack for a battery pack.

[0006] In order to achieve the purpose of the utility model, a liquid cooling plate for a battery pack is provided, comprising: a plate body, having a liquid inlet and a liquid outlet; a liquid separation cavity, arranged in the plate body and connected to the liquid inlet; a plurality of heat exchange channels arranged in parallel, each of the heat exchange channels having two ends respectively connected to the liquid separation cavity and the liquid outlet; the liquid cooling plate also comprises: a diverter, arranged in the liquid separation cavity and located at the liquid inlet, the diverter being used to divert the refrigerant entering the liquid separation cavity to guide part of the refrigerant to flow to the heat exchange channel away from the liquid outlet.

[0007] Optionally, the diverter portion has a diverter surface facing the liquid outlet, and the diverter surface is configured such that: the refrigerant collides with the diverter surface after entering the liquid diverter cavity, and the refrigerant is decelerated and diverted by colliding with the diverter surface.

[0008] Optionally, the diversion part is a diversion plate, which divides the liquid separation chamber into a first liquid separation chamber and a second liquid separation chamber, the liquid inlet is connected to the first liquid separation chamber, the heat exchange channel is connected to the second liquid separation chamber, and the diversion surface is arranged on the diversion plate and located in the first liquid separation chamber; the first liquid separation chamber has multiple diversion ports, at least one of the diversion ports is close to the liquid inlet, and at least one of the diversion ports is far away from the liquid inlet, and the farther the distance from the liquid inlet, the larger the flow area of ​​the diversion port.

[0009] Optionally, the length direction of the diverter plate is arranged along the first direction, and the diverter port includes a first diverter port and a second diverter port; the first diverter port is arranged through the diverter plate, and there are multiple first diverter ports, and the multiple first diverter ports are spaced apart along the first direction; in the first direction, the first liquid separation chamber forms the second diverter ports at positions close to both ends of the diverter plate, and the sum of the minimum flow areas of all the second diverter ports is greater than the sum of the flow areas of all the first diverter ports.

[0010] Optionally, in the first direction, the diverter surface is located in the middle of the diverter plate, the position of the liquid inlet corresponds to the position of the diverter surface, and all the first diverter ports are respectively arranged on both sides of the position of the diverter surface.

[0011] Optionally, in the first direction, the second branch port is located between the liquid inlet and the heat exchange channel farthest from the liquid inlet.

[0012] Optionally, the farther away from the liquid inlet, the larger the flow area of ​​the first diversion port.

[0013] Optionally, a flow expansion surface is provided on the first side of the diverter plate, and the flow expansion surface is close to the end of the diverter plate and located in the second diverter port. In the first direction, the farther from the liquid inlet, the larger the flow area of ​​the second diverter port.

[0014] Optionally, the liquid inlet end of each of the heat exchange channels has a liquid inlet portion, the liquid inlet portion is provided with a liquid inlet hole, and the heat exchange channel is connected with the second liquid separation chamber through the liquid inlet hole; in the first direction, the distance between the liquid inlet hole and the end closer to the diversion plate is a first spacing D1, and the flow area of ​​the liquid inlet hole is proportional to the size of the first spacing D1.

[0015] Optionally, there is a partition between each two adjacent heat exchange channels, and the partition has a first end close to the liquid inlet and a second end away from the liquid inlet; in the first direction, the distance between the first end of the partition and the end of the diverter plate that is closer to it is a second spacing D2; in the direction perpendicular to the diverter plate, the distance between the first end of the partition and the plane where the diverter plate is located is a third spacing D3, and the third spacing D3 is proportional to the second spacing D2.

[0016] According to a second aspect of the utility model, a battery pack is also disclosed, comprising the above-mentioned liquid cooling plate.

[0017] The utility model discloses a liquid cooling plate for a battery pack, in which a diversion portion is provided. After the refrigerant enters the liquid diversion cavity from the liquid inlet, it is diverted through the diversion portion, so that a part of the refrigerant flows to the heat exchange channel far away from the liquid outlet, thereby increasing the flow rate of the refrigerant in the heat exchange channel far away from the liquid outlet, and reducing the flow rate of the refrigerant in the heat exchange channel close to the liquid outlet, thereby increasing the heat exchange amount of the refrigerant in the heat exchange channel far away from the liquid outlet, improving the heat exchange effect of the liquid cooling plate, and making the heat dissipation effect of the liquid cooling plate relatively uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of a liquid cooling plate according to Embodiment 1 of the present utility model;

[0019] Figure 2 for Figure 1 A partial enlarged view of part A;

[0020] Figure 3 This is a schematic structural diagram of a liquid cooling plate according to a second embodiment of the present utility model;

[0021] Figure 4 for Figure 3 A partial enlarged view of part B;

[0022] Figure 5 for Figure 4 A partial enlarged view of part C in the middle;

[0023] List of reference numerals:

[0024] 10. Plate body; 11. Liquid inlet; 12. Liquid outlet; 20. Converging chamber; 30. Liquid separation chamber; 31. First liquid separation chamber; 32. Second liquid separation chamber; 40. Heat exchange channel; 41. Partition; 42. Channel body; 43. Buffer chamber; 50. Diversion part; 51. Diversion surface; 52. Flow expansion surface; 60. Diversion port; 61. First diversion port; 62. Second diversion port; 70. Liquid inlet; 71. Liquid inlet hole. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution of the present invention, the liquid cooling plate for a battery pack and the battery pack provided by the present invention are described in detail below in conjunction with the accompanying drawings.

[0026] With the development of technology, the performance parameters of battery packs, such as size, power, capacity, and weight, are constantly increasing. As these performance parameters increase, the heat dissipation of the battery modules in the battery pack is also increasing, so the heat dissipation requirements for the battery pack are also getting higher and higher.

[0027] In the prior art, a liquid cooling plate is usually used as the bottom plate of the battery pack, and the battery module is placed on the liquid cooling plate to achieve cooling of the battery module. In the prior art, in order to increase the heat exchange area, multiple parallel heat exchange channels are set inside the cold liquid plate, but the parallel channels are connected in series, which is equivalent to a rotating and extended channel connected between the liquid inlet and the liquid outlet of the liquid cooling plate. After the refrigerant enters the channel, the heat exchange temperature will increase. Therefore, the closer to the downstream of the heat exchange channel, the worse the cooling effect.

[0028] In some other existing technologies, in order to improve the heat exchange effect, a liquid separation cavity is set at the liquid inlet, and multiple parallel heat exchange channels are connected simultaneously through the liquid separation cavity, that is, multiple heat exchange channels are connected in parallel, and the refrigerant enters each heat exchange channel after entering the liquid separation cavity from the liquid inlet.

[0029] However, this setting still has the problem of uneven heat exchange. The main reason is that the refrigerant flow rate in each heat exchange channel is different, and different flow rates lead to different heat dissipation effects. The reason for the different refrigerant flow rates in each heat exchange channel is that the distance between the liquid inlet end of the heat exchange channel and the liquid inlet is different. Although the overall flow rate of the refrigerant will slow down after entering the liquid separation chamber from the liquid inlet and diffuse around, the refrigerant flow rate is still fast at a position close to the liquid inlet, and the heat exchange channel facing the liquid inlet is close to the liquid inlet. Therefore, most of the refrigerant will directly enter the heat exchange channel close to the liquid inlet along the direction of the liquid inlet, and the flow rate is faster, while the heat exchange channel far from the liquid inlet has a slower refrigerant inflow speed, and the flow area of ​​each heat exchange channel is the same. According to the flow rate Q=V ·S (Q is the refrigerant flow rate, V represents the refrigerant flow velocity, and S represents the flow area of ​​the heat exchange channel). It can be seen that when the flow area is the same, the greater the flow velocity, the more refrigerant flow enters the heat exchange channel. Therefore, the closer the heat exchange channel is to the liquid inlet, the greater the refrigerant flow rate and the better the heat exchange effect. The farther the heat exchange channel is from the liquid inlet, the smaller the refrigerant flow rate and the worse the heat exchange effect, which ultimately leads to uneven heat exchange of the liquid cooling plate. Therefore, how to improve the heat exchange effect of the liquid cooling plate is an urgent problem to be solved in this field.

[0030] In order to solve the above problems, Figures 1 to 5As shown, the utility model discloses a liquid cooling plate for a battery pack, comprising: a plate body 10, a confluence cavity 20, a liquid separation cavity 30, a heat exchange channel 40 and a diverter 50. The plate body 10 has a liquid inlet 11 and a liquid outlet 12; the liquid separation cavity 30 is arranged in the plate body 10 and communicates with the liquid inlet 11, and the confluence cavity is arranged in the plate body 10 and communicates with the liquid outlet 12. There are multiple heat exchange channels 40 and they are arranged in parallel, the first end of each heat exchange channel 40 is communicated with the liquid separation cavity 30, and the second end of each heat exchange channel 40 is connected to the confluence cavity; the diverter 50 is arranged in the liquid separation cavity 30 and is located at the position of the liquid inlet 11, and the diverter 50 is used to divert the refrigerant entering the liquid separation cavity 30 to guide part of the refrigerant to flow to the heat exchange channel 40 away from the position of the liquid outlet 12.

[0031] During use, after the refrigerant enters the liquid separation chamber 30 through the liquid inlet 11, it is split under the action of the diversion part 50. A part of the refrigerant flows to the heat exchange channel 40 farther away from the liquid outlet 12 under the action of the diversion part 50, and the other part of the refrigerant still flows to the heat exchange channel 40 closer to the liquid outlet 12, so that more refrigerant flows to the heat exchange channel 40 away from the liquid outlet 12, thereby reducing the refrigerant flow difference between the heat exchange channels 40.

[0032] The liquid cooling plate for the battery pack of the present invention is provided with a diverter portion 50. After the refrigerant enters the liquid diverter chamber 30 from the liquid inlet 11, it is diverted through the diverter portion 50, so that a part of it flows to the heat exchange channel 40 far away from the liquid outlet 12, thereby increasing the flow rate of the refrigerant in the heat exchange channel 40 far away from the liquid outlet 12, and reducing the flow rate of the refrigerant in the heat exchange channel 40 at a position close to the liquid outlet 12, thereby increasing the heat exchange amount of the refrigerant in the heat exchange channel 40 far away from the liquid outlet 12, improving the heat exchange effect of the liquid cooling plate, and making the heat dissipation effect of the liquid cooling plate relatively uniform.

[0033] It is understandable that the diverter portion 50 has a diverter surface 51 facing the liquid outlet 12 , and the diverter surface 51 is configured such that the refrigerant collides with the diverter surface 51 after entering the liquid diverter cavity 30 , and the refrigerant is decelerated and diverted by colliding with the diverter surface 51 . That is to say, by setting the diverter surface 51 toward the liquid outlet 12, the refrigerant will collide with the diverter surface 51 just after entering the liquid separation chamber 30. Since the refrigerant that has just entered the liquid separation chamber 30 has a faster flow rate and is more concentrated, after colliding with the diverter surface 51, the originally concentrated refrigerant is quickly dispersed by the collision. Since the dispersed refrigerant needs to bypass the diverter surface 51 and then enter the heat exchange channel 40 facing the liquid inlet 11, it is equivalent to increasing the flow distance of the refrigerant and also increasing the flow resistance of the refrigerant, so that more refrigerant can flow to the heat exchange channel 40 farther from the liquid outlet 12; moreover, after the refrigerant collides with the diverter surface 51, the flow rate of the refrigerant is also slowed down, so that the refrigerant speed in the heat exchange channel 40 facing the liquid inlet 11 is reduced, and the flow rate is reduced while the flow area remains unchanged.

[0034] It should be noted that the flow splitter 50 may be in a plate, cylindrical, prism or other structure. When the flow splitter 50 is cylindrical or prism-shaped, its circumferential side wall is the flow splitter surface 51. When the flow splitter 50 is in a plate shape, its plate-shaped side surface is the flow splitter surface 51.

[0035] Specifically, if Figure 1 As shown, the diversion portion 50 is a diversion plate, which divides the liquid diversion chamber 30 into a first liquid diversion chamber 31 and a second liquid diversion chamber 32. The liquid inlet 11 is connected to the first liquid diversion chamber 31, and the heat exchange flow channel 40 is connected to the second liquid diversion chamber 32. The diversion surface 51 is arranged on the diversion plate and is located in the first liquid diversion chamber 31; the first liquid diversion chamber 31 has a plurality of diversion ports 60, at least one diversion port 60 is close to the liquid inlet 11, and at least one diversion port 60 is far away from the liquid inlet 11, and the farther from the liquid inlet 11, the larger the flow area of ​​the diversion port 60. By setting a diverter plate, the diverter plate divides the liquid separation chamber 30 into two parts, namely the first liquid separation chamber 31 and the second liquid separation chamber 32. The first liquid separation chamber 31 is connected to the liquid inlet 11, and the second liquid separation chamber 32 is connected to the heat exchange channel 40. The first liquid separation chamber 31 and the second liquid separation chamber 32 are connected through multiple diverter ports 60. In other words, after the refrigerant enters the first liquid separation chamber 31, it is first decelerated and dispersed by colliding with the diverter surface 51, and then flows to multiple diverter ports 60 under the guidance of the first liquid separation chamber 31, and flows into the second liquid separation chamber 32 through different diverter ports 60, thereby realizing the initial liquid separation. The refrigerant flow rate after liquid separation is lower, and it flows into the second liquid separation chamber 32 through multiple different positions, which is more dispersed and easier to be diverted to each heat exchange channel 40. Moreover, since the flow area of ​​the diversion port 60 becomes larger as the distance from the liquid inlet 11 increases, it is more conducive for the refrigerant to flow to the heat exchange channel 40 which is farther from the liquid outlet 12 , thereby improving the uniformity of the refrigerant flow between the heat exchange channels 40 .

[0036] The liquid cooling plate of the present invention is further described below in conjunction with the specific first embodiment.

[0037] like Figure 1 As shown, the length direction of the diverter plate is arranged along the first direction (x direction), the diverter surface 51 is located on the first side of the diverter plate and faces the liquid inlet 11, and all the heat exchange channels 40 are located on the second side of the diverter plate.

[0038] The diverter port 60 includes a first diverter port 61 and a second diverter port 62. The first diverter port 61 is arranged through the diverter plate, that is, the first diverter port 61 runs from the first side of the diverter plate to the second side. There are multiple first diverter ports 61, and the multiple first diverter ports 61 are spaced apart along the first direction. In the first direction, the first liquid separation cavity 31 forms the second diverter ports 62 at positions close to both ends of the diverter plate. The sum of the minimum flow areas of all the second diverter ports 62 is greater than the sum of the flow areas of all the first diverter ports 61.

[0039] After the refrigerant enters the first liquid separation chamber 31 through the liquid inlet 11, it will first hit the diversion surface 51 to disperse and flow along the first direction (x direction) to the two ends of the diversion plate under the guidance of the inner wall of the first liquid separation chamber 31, and then flow from the second diversion port 62 to the second liquid separation chamber 32. After the refrigerant enters the second liquid separation chamber 32 from the second diversion port 62, it will flow to the nearby heat exchange channel 40, that is, part of the refrigerant will flow to the refrigerant far away from the liquid inlet 11, and another part of the refrigerant will bypass the diversion plate and flow to the heat exchange channel 40 closer to the liquid inlet 11. Since the second diversion port 62 is located at both ends of the diversion plate, the distance between the second diversion port 62 and the several heat exchange channels 40 farther away from the liquid inlet 11 becomes closer, so the refrigerant flow rate in the several heat exchange channels 40 farther away from the liquid inlet 11 will be larger, and the refrigerant flow rate in the several heat exchange channels 40 closer to the liquid inlet 11 will be smaller accordingly. At the same time, since the first diversion port 61 is provided on the diversion plate, a part of the refrigerant in the first liquid diversion chamber 31 will flow through the first diversion port 61 to several heat exchange channels 40 in the second liquid diversion chamber 32 that are closer to the liquid inlet 11, and since the sum of the minimum flow areas of all the second diversion ports 62 is greater than the sum of the flow areas of all the first diversion ports 61, the refrigerant flowing out of the second diversion ports 62 is more than the refrigerant flowing out of the first diversion ports 61, so as to ensure that there is enough refrigerant flowing to several heat exchange channels 40 that are far away from the liquid inlet 11, and at the same time, it also avoids excessive refrigerant flow in several heat exchange channels 40 that are close to the liquid inlet 11, so that the refrigerant flow direction in each heat exchange channel 40 tends to be consistent.

[0040] In the first direction, the diverter surface 51 is located in the middle of the diverter plate, the position of the liquid inlet 11 corresponds to the position of the diverter surface 51, and all the first diverter ports 61 are respectively arranged on both sides of the position of the diverter surface 51. Figure 2 As shown, the flow dividing surface 51 faces the liquid inlet 11, so that the refrigerant entering the first liquid dividing chamber 31 from the liquid inlet 11 can directly hit the flow dividing surface 51, and the first flow dividing openings 61 are respectively arranged on both sides of the position where the flow dividing plate is located, that is, Figure 2The upper and lower parts of the middle diverter surface 51 can make the diverted refrigerant enter the second liquid diverter cavity 32 more evenly. The second diverter port 62 is located between the liquid inlet 11 and the heat exchange channel 40 farthest from the liquid inlet 11. Figure 1 As shown, the second branch port 62 is located between the heat exchange channel 40 farthest from the liquid inlet 11 and the heat exchange channel 40 closest to the liquid inlet 11, so that after the refrigerant flows out from the second branch port 62, the distance difference between the refrigerant flows to each heat exchange channel 40 is reduced, thereby reducing the difference in refrigerant flow between each heat exchange channel 40.

[0041] like Figure 2 As shown, in this embodiment, the farther from the liquid inlet 11, the larger the flow area of ​​the first diverter port 61. Since the pressure in the first diverter cavity 31 is relatively high near the liquid inlet 11, the refrigerant flow rate is still relatively fast, and the refrigerant flow rate is relatively slow at a position far from the liquid inlet 11. Therefore, by setting the flow area of ​​the first diverter port 61 near the liquid inlet 11 to be relatively small, it is avoided that too much refrigerant flows to the second diverter cavity 32 through the first diverter port 61.

[0042] The first side of the diverter plate is provided with a flow expansion surface 52, which is close to the end of the diverter plate and is located in the second diverter port 62. In the first direction, the farther from the liquid inlet 11, the larger the flow area of ​​the second diverter port 62. In other words, the flow surface and the inner wall where the liquid inlet 11 is located are not arranged in parallel. Therefore, in the first direction, when the refrigerant flows in the second diverter port 62 away from the liquid outlet 12, the flow area of ​​the second diverter port 62 is gradually increased. Since the flow area is gradually increased, it is more conducive to the dispersion of the refrigerant, and the difference in flow between several heat exchange channels 40 near the second diverter port 62 is reduced, thereby improving the heat exchange effect.

[0043] like Figure 3 and Figure 4 As shown, the second embodiment of the utility model also discloses a liquid cooling plate, whose structure is basically the same as that of the first embodiment, except that, in this embodiment, the liquid inlet end of each heat exchange channel 40 has a liquid inlet portion 70, and the liquid inlet portion 70 is provided with a liquid inlet hole 71, and the heat exchange channel 40 is connected with the second liquid separation chamber 32 through the liquid inlet hole 71; in the first direction, the distance between the liquid inlet hole 71 and the end closer to the diverter plate is the first spacing D1, and the flow area of ​​the liquid inlet hole 71 is proportional to the size of the first spacing D1. That is to say, Figure 5 As shown, the distance Figure 5 The closer the end of the middle diverter plate is (that is, the closer it is to the second diverter port 62), the smaller the flow area of ​​the liquid inlet 71 is. Figure 5 The farther the liquid inlet hole 71 is from the end of the middle diverter plate (that is, farther from the second diverter port 62 ), the larger the flow area thereof.

[0044] like Figure 4 As shown, after the refrigerant enters the first liquid-dividing cavity 31, most of the refrigerant will flow to the second liquid-dividing cavity 32 through the second diverting port 62, while a small part of the refrigerant will flow into the second liquid-dividing cavity 32 from the first diverting port 61. The closer the heat exchange flow channel 40 is to the second diverting port 62, the easier it is for the refrigerant to flow into it. Therefore, the closer the heat exchange flow channel 40 is to the second diverting port 62, the greater the refrigerant flow rate in the heat exchange flow channel 40, and the farther the heat exchange flow channel 40 is from the second diverting port 62, the smaller the refrigerant flow rate in the heat exchange flow channel 40. By providing a liquid inlet portion 70 and providing a liquid inlet hole 71 on the liquid inlet portion 70, a smaller liquid inlet hole 71 can be provided in the heat exchange flow channel 40 closer to the second diverting port 62, and a larger liquid inlet hole 71 can be provided in the heat exchange flow channel 40 farther from the second diverting port 62, so that the flow rates in adjacent heat exchange flow channels 40 tend to be consistent, thereby improving the uniformity of heat exchange.

[0045] It can be understood that in this embodiment, the liquid inlet part 70 is a liquid inlet plate, each heat exchange channel 40 is provided with a liquid inlet plate, and the liquid inlet plate divides the heat exchange channel 40 into a channel body 42 and a buffer cavity 43, and the channel body 42 and the buffer cavity 43 are connected through the liquid inlet hole 71.

[0046] like Figure 5 As shown, there is a partition 41 between each two adjacent heat exchange channels 40, the partition 41 has a first end close to the liquid inlet 11 and a second end away from the liquid inlet 11, each liquid inlet plate is connected between two adjacent partitions 41, and the two adjacent partitions 41 and the side of the liquid inlet plate facing the liquid inlet 11 form a buffer cavity 43, the buffer cavity 43 is connected to the second liquid separation cavity 32, and the two partitions 41 and the side of the liquid inlet plate facing the liquid outlet 12 form a channel body 42. By forming the buffer cavity 43 at the first end of the heat exchange channel 40, the area near the liquid inlet 11 can be separated into relatively independent areas, thereby preventing the refrigerant near the liquid inlet 11 from being disturbed by the refrigerant flowing in the first direction, which is more conducive to the refrigerant entering the liquid inlet 11.

[0047] In the first direction, the distance between the first end of the partition 41 and the end closer to the diverter plate is the second spacing D2; in the direction perpendicular to the diverter plate, the distance between the first end of the partition 41 and the plane where the diverter plate is located is the third spacing D3, and the third spacing D3 is proportional to the second spacing D2. In other words, in the first direction, the farther from the first end of the diverter plate, the smaller the distance between the first end of the partition 41 and the side of the liquid inlet plate facing the liquid inlet 11. This arrangement is more conducive to the refrigerant in the buffer cavity 43 overflowing in the direction away from the end of the liquid inlet plate, making it easier for the refrigerant to flow in the direction away from the end of the liquid inlet plate, thereby reducing the difference in refrigerant flow between adjacent heat exchange channels 40.

[0048] According to another aspect of the utility model, a battery pack is also disclosed, comprising the above-mentioned liquid cooling plate.

[0049] Furthermore, the battery pack also includes: a shell, connecting ribs and a battery module, the shell is buckled on the liquid cooling plate and forms a mounting cavity with the liquid cooling plate, the connecting ribs are arranged in the mounting cavity and connected to the surface of the liquid cooling plate, the connecting ribs are arranged along the first direction, and the distance between the connecting ribs and the liquid inlet 11 is greater than the distance between the connecting ribs and the liquid outlet 12. The battery module is arranged on the liquid cooling plate and located in the mounting cavity, and the battery module is fixedly connected to the liquid cooling plate through the connecting ribs. With the battery pack of the utility model, the liquid cooling plate can make the heat dissipation of the battery module more uniform, thereby improving the heat dissipation effect of the battery module.

[0050] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A liquid cooling plate for a battery pack, comprising: The plate body (10) has a liquid inlet (11) and a liquid outlet (12); A liquid separation chamber (30) disposed in the plate body (10) and connected to the liquid inlet (11); A plurality of heat exchange channels (40) are arranged in parallel, and two ends of each of the heat exchange channels (40) are respectively connected to the liquid separation cavity (30) and the liquid outlet (12); characterized in that the liquid cooling plate further comprises: The diverter portion (50) is arranged in the liquid separation chamber (30) and located at the position of the liquid inlet (11), and the diverter portion (50) is used to divert the refrigerant entering the liquid separation chamber (30) to guide part of the refrigerant to flow to the heat exchange channel (40) away from the position of the liquid outlet (12).

2. The liquid cooling plate according to claim 1, characterized in that: The diversion portion (50) has a diversion surface (51) facing the liquid outlet (12), and the diversion surface (51) is configured such that the refrigerant collides with the diversion surface (51) after entering the liquid diversion chamber (30), and the refrigerant is decelerated and diverted by colliding with the diversion surface (51).

3. The liquid cooling plate according to claim 2, characterized in that: The flow dividing portion (50) is a flow dividing plate, the flow dividing plate divides the liquid dividing chamber (30) into a first liquid dividing chamber (31) and a second liquid dividing chamber (32), the liquid inlet (11) is in communication with the first liquid dividing chamber (31), the heat exchange flow channel (40) is in communication with the second liquid dividing chamber (32), and the flow dividing surface (51) is arranged on the flow dividing plate and is located in the first liquid dividing chamber (31); The first liquid separation chamber (31) has a plurality of diversion openings (60), at least one of the diversion openings (60) is close to the liquid inlet (11), and at least one of the diversion openings (60) is far away from the liquid inlet (11), and the farther the diversion opening (60) is from the liquid inlet (11), the larger the flow area of ​​the diversion opening (60) is.

4. The liquid cooling plate according to claim 3, characterized in that: The length direction of the diverter plate is arranged along a first direction, and the diverter port (60) comprises a first diverter port (61) and a second diverter port (62); The first flow diversion opening (61) is disposed through the flow diversion plate, there are a plurality of the first flow diversion openings (61), and the plurality of the first flow diversion openings (61) are distributed at intervals along the first direction; In the first direction, the first liquid separation cavity (31) forms the second flow diversion openings (62) at positions close to both ends of the flow diversion plate, and the sum of the minimum flow areas of all the second flow diversion openings (62) is greater than the sum of the flow areas of all the first flow diversion openings (61).

5. The liquid cooling plate according to claim 4, characterized in that: In the first direction, the diverter surface (51) is located in the middle of the diverter plate, the position of the liquid inlet (11) corresponds to the position of the diverter surface (51), and all the first diverter ports (61) are respectively arranged on both sides of the position of the diverter surface (51).

6. The liquid cooling plate according to claim 5, characterized in that: In the first direction, the second branch port (62) is located between the liquid inlet (11) and the heat exchange channel (40) farthest from the liquid inlet (11).

7. The liquid cooling plate according to claim 4, characterized in that: The farther away from the liquid inlet (11), the larger the flow area of ​​the first diversion port (61).

8. The liquid cooling plate according to claim 4, characterized in that: A flow diffusion surface (52) is provided on the first side of the diverter plate. The flow diffusion surface (52) is close to the end of the diverter plate and is located in the second diverter port (62). In the first direction, the farther from the liquid inlet (11), the larger the flow area of ​​the second diverter port (62).

9. The liquid cooling plate according to claim 4, characterized in that: The liquid inlet end of each heat exchange channel (40) has a liquid inlet portion (70), and the liquid inlet portion (70) is provided with a liquid inlet hole (71), and the heat exchange channel (40) is connected to the second liquid separation cavity (32) through the liquid inlet hole (71); In the first direction, the distance between the liquid inlet hole (71) and the end of the diverter plate that is closer is a first spacing D1, and the flow area of ​​the liquid inlet hole (71) is proportional to the size of the first spacing D1.

10. The liquid cooling plate according to claim 8, characterized in that: A partition plate (41) is provided between each two adjacent heat exchange channels (40), and the partition plate (41) has a first end close to the liquid inlet (11) and a second end away from the liquid inlet (11); In the first direction, the distance between the first end of the partition plate (41) and the end of the diverter plate that is closer is a second distance D2; In a direction perpendicular to the diverter plate, the distance between the first end of the partition plate (41) and the plane where the diverter plate is located is a third distance D3, and the third distance D3 is proportional to the second distance D2.

11. A battery pack, characterized in that: The liquid cooling plate comprises the liquid cooling plate according to any one of claims 1 to 10.

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