Liquid cooling plate and liquid cooling battery pack

Abstract

The utility model relates to the field of liquid cooling heat dissipation of batteries, in particular to a liquid cooling plate and a liquid cooling battery pack. The plate body is provided with a first liquid flow port and a second liquid flow port, and the first liquid flow port and the second liquid flow port are formed in the two opposite sides of the plate body respectively. The plate body is provided with a plurality of strip-shaped structural parts, and the adjacent strip-shaped structural parts are arranged at intervals to form a first flow channel; the connecting line of the first liquid flow port and the second liquid flow port is parallel to the first flow channel; the width of the strip-shaped structural member is gradually increased from the middle of the plate body to the side edge of the plate body in the direction perpendicular to the connecting line; the heat dissipation area of the middle part of the plate body is large by changing the heat dissipation area of the liquid cooling plate, and the temperature uniformity of the battery cell is improved by controlling the heat dissipation efficiency of different positions of the battery cell; the flow channel is a flat and straight flow channel capable of convection, so that the heat transfer efficiency is improved; according to the liquid-cooled battery pack, the battery cells can be rapidly cooled, and the temperature uniformity of the battery cells is improved.

Description

Technical Field

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

[0002] As the energy density and power of the battery pack increase, a large amount of heat will accumulate during operation. If the battery pack cannot be cooled in a timely and effective manner, it will affect the stable operation of the battery pack and even cause safety hazards. Liquid cooling is usually used to dissipate heat from the battery pack.

[0003] However, since it is more difficult to dissipate heat as the battery pack is closer to the center, the temperature of the battery cells near the middle of the battery pack is higher. The flow channels of traditional liquid cooling plates are arranged in an equal-width and uniform manner. The traditional liquid cooling plates dissipate heat in various parts, resulting in the temperature of the battery cells in the center of the battery pack being higher than the temperature of the battery cells at both ends or sides of the battery pack, which seriously affects the global temperature difference of the battery pack, causes poor temperature uniformity of the battery cells in the battery pack, and reduces the service life of the battery pack.

[0004] Therefore, there is an urgent need for a technical solution to solve the technical problem that the currently used liquid cooling plate affects the global temperature difference of the battery pack, resulting in poor temperature uniformity of the battery cells in the battery pack. Utility Model Content

[0005] The utility model aims to provide a liquid cooling plate and a liquid-cooled battery pack to solve the technical problem that the currently used liquid cooling plate affects the global temperature difference of the battery pack, resulting in poor temperature uniformity of the battery cells in the battery pack.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A liquid cooling plate comprises a plate body;

[0008] The plate body is provided with a first liquid flow port and a second liquid flow port, wherein the first liquid flow port and the second liquid flow port are respectively provided on two opposite sides of the plate body;

[0009] The plate body is provided with a plurality of strip-shaped structural members, and adjacent strip-shaped structural members are arranged at intervals to form a first flow channel;

[0010] A line connecting the first liquid flow port and the second liquid flow port is parallel to the first flow channel;

[0011] Perpendicular to the direction of the connecting line, the width of the strip-shaped structural member gradually increases from the middle of the plate body to the side of the plate body.

[0012] The utility model provides a liquid cooling plate, wherein a first liquid flow port and a second liquid flow port are arranged on two opposite sides of a plate body, and by arranging the first flow channel to be parallel to the line connecting the first liquid flow port and the second liquid flow port, the cooling liquid can be quickly exchanged with the outside through the first liquid flow port or the second liquid flow port, and can quickly take away the heat on the plate body, thereby improving the heat dissipation efficiency of the battery pack; in a direction perpendicular to the line, the width of the strip structure is gradually increased, so that the heat dissipation area in the middle of the plate body is larger than the heat dissipation areas on both sides perpendicular to the line direction, so that when the cooling liquid flows, it can take away more heat in the middle of the plate body and less heat on both sides of the battery cell, thereby ensuring the global temperature difference of the battery pack and improving the temperature uniformity of the single battery cell; the utility model provides a liquid cooling plate, which realizes rapid circulation of the cooling liquid through the first liquid flow port and the second liquid flow port, thereby improving the heat dissipation efficiency of the battery pack, and ensuring the global temperature difference of the battery pack and improving the temperature uniformity of the single battery cell by changing the heat dissipation areas at different positions of the plate body.

[0013] As a preferred solution of the utility model, perpendicular to the direction of the connecting line, the cross-sectional area of ​​the first flow channel gradually decreases from the middle of the plate body to the side of the plate body. This is adapted to the higher temperature in the middle of the battery pack and the lower temperature at the periphery of the battery pack, so that the cross-sectional area of ​​the first flow channel set in the middle of the plate body is the largest; in the direction perpendicular to the connecting line, the closer to the side of the plate body, the smaller the cross-sectional area of ​​the first flow channel, so that the heat dissipation capacity of the first flow channel gradually changes to ensure the global temperature difference of the battery pack.

[0014] As a preferred solution of the utility model, the centerline spacing of any adjacent strip-shaped structural members is the same. The centerline spacing of any adjacent strip-shaped structural members is made the same, and the width of the strip-shaped structural members is controlled to change uniformly, so that the cross-sectional area of ​​different first flow channels in the direction perpendicular to the connecting line gradually changes, so that the heat dissipation capacity of the liquid cooling plate gradually decreases from the middle of the plate body to the side of the plate body; the centerline of the strip-shaped structural member is an extension line passing through the center of the strip-shaped structural member and arranged along the length direction of the strip-shaped structural member.

[0015] As a preferred solution of the utility model, the plate body is provided with a plurality of second flow channels in a direction perpendicular to the connecting line, the second flow channels are connected with the first flow channels, and adjacent second flow channels are arranged at intervals. By providing the second flow channels connected with the first flow channels, the contact area between the liquid cooling plate and the coolant is increased, so that the liquid cooling plate has a better heat dissipation effect.

[0016] As a preferred solution of the utility model, along the connecting line direction, the cross-sectional area of ​​the second flow channel gradually decreases from the middle of the plate body to the side of the plate body. By setting the cross-sectional area of ​​the second flow channel located in the middle of the plate body to the maximum, the heat dissipation capacity of the middle of the liquid cooling plate is stronger; along the connecting line direction, the cross-sectional areas of different second flow channels gradually decrease from the middle of the plate body to the side of the plate body, so that the heat dissipation capacity of the liquid cooling plate gradually decreases from the middle of the plate body to the side of the plate body along the connecting line direction.

[0017] As a preferred solution of the utility model, the width of the second flow channel ranges from 23mm to 39mm. The closer to the center of the plate, the larger the width of the second flow channel. The width of the second flow channel at the center of the plate is 39mm, the width of the second flow channel at the edge of the plate is 23mm, and the width difference of adjacent second flow channels is 2mm.

[0018] As a preferred solution of the utility model, the width of the first flow channel ranges from 10.5 mm to 19.5 mm. The closer to the center of the plate, the larger the width of the first flow channel. The width of the first flow channel at the center of the plate is 19.5 mm, the width of the first flow channel at the edge of the plate is 10.5 mm, and the width difference of adjacent first flow channels is 1 mm.

[0019] As a preferred solution of the utility model, the cross-sectional areas of different first flow channels are the same. The cross-sectional areas of all the first flow channels are the same. By changing the width of the strip-shaped structural member, the number of first flow channels arranged in the middle of the plate body is large, while the number of first flow channels arranged on the side of the plate body is small, so that the heat dissipation capacity of the middle of the plate body is stronger, ensuring the global temperature difference of the battery pack.

[0020] As a preferred solution of the utility model, the strip structure is spaced apart from the side of the plate body, so that the coolant can be dispersed or gathered through the space, and the coolant in each flow channel can flow.

[0021] As a preferred solution of the utility model, the first extension part and the second extension part are respectively arranged at opposite ends of the plate body, the first liquid flow port is arranged at the first extension part, and the second liquid flow port is arranged at the second extension part. The first extension part and the second extension part are arranged to set the first liquid flow port and the second liquid flow port, which can avoid uneven distribution of the coolant; the first extension part is located in the middle of the plate body perpendicular to the connecting line direction, and the first extension part and the second extension part are symmetrically arranged.

[0022] A liquid-cooled battery pack includes the above-mentioned liquid cooling plate and a liquid cooling box, wherein the liquid cooling box is adaptably connected to the liquid cooling plate, the first liquid flow port is connected to a liquid inlet pipe, and the second liquid flow port is connected to a liquid discharge pipe.

[0023] The utility model provides a liquid-cooled battery pack, in which a first liquid flow port is connected to a liquid inlet pipe, and a second liquid flow port is connected to a liquid discharge pipe. Coolant enters the liquid cooling box from the first liquid flow port and is discharged from the liquid cooling box from the second liquid flow port. In the liquid cooling box, the coolant flows from the first liquid flow port to the second liquid flow port through the first flow channel. Since the cross-sectional area of ​​the first flow channel in the middle of the plate body is larger, the heat dissipation area in the middle of the plate body is larger, thereby being able to take away more heat from the middle of the battery pack, thereby ensuring the global temperature difference of the battery pack.

[0024] A liquid-cooled battery pack includes the above-mentioned liquid cooling plate and a liquid cooling box, wherein the liquid cooling box is adaptably connected to the liquid cooling plate, a liquid inlet pipe is arranged in the middle of the liquid cooling box, and the first liquid flow port and the second liquid flow port are both connected to a liquid discharge pipe.

[0025] In a liquid-cooled battery pack of the utility model, coolant enters the liquid cooling box from the middle of the liquid cooling box and is then discharged from a first liquid flow port and a second liquid flow port. The coolant has a faster flow speed in the liquid cooling box. When the coolant enters the liquid cooling box, it first contacts the middle area of ​​the plate body, which can effectively cool the middle of the battery pack, thereby improving the cooling performance of the liquid cooling box and ensuring the global temperature difference of the battery pack.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0027] 1. A liquid cooling plate of the utility model is provided with a first liquid flow port and a second liquid flow port on opposite sides of a plate body, and by providing the first flow channel parallel to the line connecting the first liquid flow port and the second liquid flow port, the cooling liquid can be quickly exchanged with the outside through the first liquid flow port or the second liquid flow port, and can quickly take away the heat on the plate body, thereby improving the heat dissipation efficiency of the battery pack; in a direction perpendicular to the line, the width of the strip structure is gradually increased, so that the heat dissipation area in the middle of the plate body is larger than the heat dissipation area on both sides perpendicular to the line direction, so that when the cooling liquid flows, it can take away more heat in the middle of the plate body and less heat on both sides of the battery cell, thereby ensuring the global temperature difference of the battery pack and improving the temperature uniformity of the single battery cell; A liquid cooling plate of the utility model realizes rapid circulation of the cooling liquid through the first liquid flow port and the second liquid flow port, thereby improving the heat dissipation efficiency of the battery pack, and by changing the heat dissipation area at different positions of the plate body, the global temperature difference of the battery pack is ensured, thereby improving the temperature uniformity of the single battery cell.

[0028] 2. In a liquid-cooled battery pack of the utility model, a first liquid flow port is connected to a liquid inlet pipe, a second liquid flow port is connected to a liquid discharge pipe, the coolant enters the liquid cooling box from the first liquid flow port and is discharged from the liquid cooling box from the second liquid flow port. In the liquid cooling box, the coolant flows from the first liquid flow port to the second liquid flow port through the first flow channel. Since the cross-sectional area of ​​the first flow channel in the middle of the plate body is larger, the heat dissipation area in the middle of the plate body is larger, thereby being able to take away more heat from the middle of the battery pack and ensuring the global temperature difference of the battery pack.

[0029] 3. In a liquid-cooled battery pack of the utility model, the coolant enters the liquid cooling box from the middle of the liquid cooling box and is then discharged from the first liquid flow port and the second liquid flow port. The coolant has a faster flow speed in the liquid cooling box. When the coolant enters the liquid cooling box, it first contacts the middle area of ​​the plate body, which can effectively cool the middle of the battery pack, thereby improving the cooling performance of the liquid cooling box and ensuring the global temperature difference of the battery pack.

[0030] 4. The utility model provides a liquid cooling plate with a simple structure and easy manufacturing. By changing the width of the strip structure of the flow channel, the middle part of the liquid cooling plate has a larger heat dissipation area, so that when the coolant takes away the heat generated by the battery cell, the heat dissipation area in the middle part of the plate body can be larger, thereby improving the temperature uniformity of the battery cell; the flow channel is constructed as a flat flow channel, which can realize the convection of the coolant, increase heat transfer, and improve the heat dissipation effect; ensure the safe operation of the battery cell, and have good economic value and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of a liquid cooling plate in Example 1;

[0032] Figure 2 is a structural schematic diagram of a liquid cooling plate in Example 2;

[0033] Figure 3 is a schematic structural diagram of a liquid cooling plate in Example 3;

[0034] Figure 4 is a schematic structural diagram of a liquid cooling box of a liquid-cooled battery pack in Example 4;

[0035] Figure 5 It is a schematic structural diagram of a liquid cooling box of a liquid-cooled battery pack in Example 5.

[0036] icon:

[0037] 1-plate body, 2-first liquid flow port, 3-second liquid flow port, 4-strip structure, 5-first flow channel, 6-second flow channel, 7-liquid cooling box, 8-liquid inlet pipe, 9-liquid discharge pipe. DETAILED DESCRIPTION

[0038] The utility model is described in detail below in conjunction with the accompanying drawings.

[0039] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0040] Example 1

[0041] like Figure 1 A liquid cooling plate shown includes a plate body 1;

[0042] The plate body 1 is provided with a first liquid flow port 2 and a second liquid flow port 3, wherein the first liquid flow port 2 and the second liquid flow port 3 are respectively provided on two opposite sides of the plate body 1;

[0043] The plate body 1 is provided with a plurality of strip-shaped structural members 4, and adjacent strip-shaped structural members 4 are arranged at intervals to form a first flow channel 5;

[0044] The connecting line between the first liquid flow port 2 and the second liquid flow port 3 is parallel to the first flow channel 5;

[0045] Perpendicular to the direction of the connecting line, the width of the strip-shaped structural member 4 gradually increases from the middle of the plate body 1 to the side of the plate body 1 .

[0046] By controlling the width of the strip structure 4, the width of the strip structure 4 from the middle of the plate body 1 to the side of the plate body 1 gradually increases; the strip structure 4 can control the distribution of the first flow channel 5 on the plate body and the size of the local heat dissipation area of ​​the plate body 1; the wider the width of the strip structure 4, the more area of ​​the plate body 1 occupied by the strip structure 4, and the smaller the local heat dissipation area of ​​the plate body 1 where the strip structure 4 is set, and the more difficult the heat dissipation is; from the middle of the plate body 1 to the side of the plate body 1, the width of the strip structure 4 gradually increases, so that the heat dissipation capacity from the middle of the plate body 1 to the side of the plate body 1 gradually decreases, thereby realizing the control of the temperature uniformity of the battery cell.

[0047] Specifically, the center line spacing of any adjacent strip-shaped structural members 4 is the same, and the width of the strip-shaped structural members 4 is controlled to change uniformly, so that the cross-sectional areas of different first flow channels 5 in the direction perpendicular to the connecting line change uniformly; and the width of the strip-shaped structural members 4 is increased so that the strip-shaped structural members 4 occupy the first flow channels 5 on both sides thereof.

[0048] Specifically, in a direction perpendicular to the connecting line, a plurality of strip-shaped structural members 4 are arranged on the plate body 1, and the cross-sectional area of ​​the first flow channel 5 gradually decreases from the middle of the plate body 1 perpendicular to the connecting line to the side of the plate body 1; by controlling the width of the strip-shaped structural members 4, the width of the strip-shaped structural members 4 gradually increases from the middle of the plate body 1 perpendicular to the connecting line to the side of the plate body 1, and the cross-sectional area of ​​the first flow channel 5 gradually decreases, thereby adapting to the gradual change in temperature from the middle of the battery pack to the edge of the battery pack.

[0049] Specifically, the strip structure 4 is spaced apart from the side of the plate body 1 , so that the coolant in the first flow channel 5 can be gathered or split from the strip structure 4 by the space on the side of the plate body 1 , so that the coolant in each first flow channel 5 can flow smoothly.

[0050] Specifically, a first extension portion and a second extension portion are respectively provided at opposite ends of the plate body 1, the first liquid flow port 2 is provided at the first extension portion, and the second liquid flow port 3 is provided at the second extension portion; through the first extension portion and the second extension portion, the first liquid flow port 2 and the second liquid flow port 3 are prevented from directly flushing the plate body 1 to cause uneven distribution of the coolant, so that the coolant can flow evenly in the first flow channel 5.

[0051] Specifically, the plate body 1 is a rectangular plate, and a first extension portion and a second extension portion are respectively arranged on both sides in the length direction of the rectangular plate, so that the first extension portion and the second extension portion are both located in the middle of the width direction of the rectangular plate, a strip structure 4 is arranged on the line connecting the first extension portion and the second extension portion, and a plurality of strip structures 4 are arranged in the width direction of the rectangular plate, the strip structures 4 are parallel to each other, and gaps are arranged between adjacent strip structures 4 to form a first flow channel 5, and adjacent first flow channels 5 are parallel to each other; in the width direction of the plate body 1, the width of the first flow channel 5 from the middle of the plate body 1 to the side of the plate body 1 is 19.5mm, 18.5mm, 17.5mm, 16.5mm, 15.5mm, 14.5mm, 13.5mm, 12.5mm, 11.5mm and 10.5mm respectively.

[0052] A liquid cooling plate of the present embodiment, when in use, the coolant flows in the first flow channel 5 to take away the heat of the liquid cooling plate, and the coolant in the first flow channel 5 exchanges coolant with the outside through the first liquid flow port 2 or the second liquid flow port 3. Since the width of the first flow channel 5 in the width direction of the plate body 1 gradually changes, the closer the first flow channel 5 is to the two sides in the width direction of the plate body 1, the worse the heat dissipation capacity is, thereby ensuring the global temperature difference of the battery pack.

[0053] A liquid cooling plate of the utility model is provided with a first liquid flow port 2 and a second liquid flow port 3 on two opposite sides of a plate body 1, and by arranging the first flow channel 5 to be parallel to the connecting line between the first liquid flow port 2 and the second liquid flow port 3, the cooling liquid can be quickly exchanged with the outside through the first liquid flow port 2 or the second liquid flow port 3, and can quickly take away the heat on the plate body 1, thereby improving the heat dissipation efficiency of the battery pack; in the direction perpendicular to the connecting line, the width of the strip structure 4 is gradually increased, so that the heat dissipation area in the middle of the plate body 1 is larger than the heat dissipation area on both sides perpendicular to the connecting line direction, so that when the cooling liquid flows, it can take away more heat from the middle of the plate body 1 and less heat from both sides of the battery cell, thereby ensuring the global temperature difference of the battery pack and improving the temperature uniformity of the single battery cell; a liquid cooling plate of the utility model realizes rapid circulation of the cooling liquid through the first liquid flow port 2 and the second liquid flow port 3, thereby improving the heat dissipation efficiency of the battery pack, and ensuring the global temperature difference of the battery pack and improving the temperature uniformity of the single battery cell by changing the heat dissipation area at different positions of the plate body 1.

[0054] Example 2

[0055] like Figure 2The structure of a liquid cooling plate shown is substantially the same as that of Example 1. The difference from Example 1 is that the plate body 1 is provided with a plurality of second flow channels 6, the second flow channels 6 are connected with the first flow channels 5, and adjacent second flow channels 6 are arranged at intervals.

[0056] Specifically, along the connecting line direction, the cross-sectional area of ​​the second flow channel 6 gradually decreases from the middle of the plate body 1 to the side of the plate body 1; the second flow channel 6 is arranged along the width direction of the plate body 1, so that the second flow channel 6 vertically penetrates the first flow channel 5, so that the contact area between the coolant and the plate body 1 is larger, and the heat dissipation capacity of the plate body 1 is stronger.

[0057] Specifically, along the connecting line direction in the length direction of the plate body 1, from the middle of the plate body 1 to the side of the length direction of the plate body 1, the width of the second flow channel 6 is 39mm, 37mm, 35mm, 33mm, 31mm, 29mm, 27mm, 25mm and 23mm respectively.

[0058] Example 3

[0059] like Figure 3 The structure of a liquid cooling plate shown is substantially the same as that of Embodiment 1, and the difference from Embodiment 1 is that: 6. the cross-sectional areas of the first flow channels 5 are the same.

[0060] Specifically, by controlling the width of the strip structure 4 , in the width direction of the plate body 1 , the arrangement density of the first flow channels 5 is greater in the middle of the plate body 1 , while the arrangement density of the first flow channels 5 on both sides of the plate body 1 is smaller.

[0061] Example 4

[0062] like Figure 4 A liquid-cooled battery pack shown includes a liquid cooling plate of Example 1 / Example 2 / Example 3, and also includes a liquid cooling box 7, the liquid cooling box 7 is adapted to be connected to the liquid cooling plate, the first liquid flow port 2 is connected to the liquid inlet pipe 8, and the second liquid flow port 3 is connected to the liquid discharge pipe 9.

[0063] A liquid-cooled battery pack of the present embodiment, when in use, coolant is introduced from the first liquid flow port 2, and the coolant is discharged from the second liquid flow port 3. The first liquid flow port 2 and the second liquid flow port 3 form convection through the first flow channel 5, which can make the coolant flow quickly, thereby improving the heat dissipation capacity of the liquid cooling plate and ensuring the global temperature difference of the battery pack.

[0064] Example 5

[0065] like Figure 5 A liquid-cooled battery pack shown includes a liquid cooling plate of Example 2, and also includes a liquid cooling box 7, the liquid cooling box 7 is adaptably connected to the liquid cooling plate, a liquid inlet pipe 8 is arranged in the middle of the liquid cooling box 7, and the first liquid flow port 2 and the second liquid flow port 3 are both connected to a liquid discharge pipe 9.

[0066] A liquid-cooled battery pack of the present embodiment is provided with a liquid inlet pipe 8 in the middle of the liquid cooling box 7 so that the cooling liquid enters the liquid cooling box 7 and impacts the middle of the plate body 1. The cooling liquid flows in the first flow channel 5 and the second flow channel 6, and can take away the heat in the middle of the liquid cooling plate more quickly. The cooling liquid is discharged from the first liquid flow port 2 and the second liquid flow port 3, which increases the flow rate of the cooling liquid in the liquid cooling box 7, makes the heat dissipation efficiency of the liquid cooling plate higher, and ensures the global temperature difference of the battery pack.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid cooling plate, characterized in that: It includes a plate body (1); The plate body (1) is provided with a first liquid flow port (2) and a second liquid flow port (3), wherein the first liquid flow port (2) and the second liquid flow port (3) are respectively arranged on two opposite sides of the plate body (1); The plate body (1) is provided with a plurality of strip-shaped structural members (4), and adjacent strip-shaped structural members (4) are arranged at intervals to form a first flow channel (5); A line connecting the first liquid flow port (2) and the second liquid flow port (3) is parallel to the first flow channel (5); In a direction perpendicular to the connecting line, from the middle of the plate body (1) to the side of the plate body (1), the width of the strip-shaped structural member (4) gradually increases.

2. A liquid cooling plate according to claim 1, characterized in that: In a direction perpendicular to the connecting line, from the middle of the plate body (1) to the side of the plate body (1), the cross-sectional area of ​​the first flow channel (5) gradually decreases.

3. A liquid cooling plate according to claim 2, characterized in that: The center line spacing of any adjacent strip-shaped structural members (4) is the same.

4. A liquid cooling plate according to claim 3, characterized in that: In a direction perpendicular to the connecting line, the plate body (1) is provided with a plurality of second flow channels (6), the second flow channels (6) being connected to the first flow channels (5), and adjacent second flow channels (6) being arranged at intervals.

5. A liquid cooling plate according to claim 4, characterized in that: Along the connecting line direction, from the middle of the plate body (1) to the side of the plate body (1), the cross-sectional area of ​​the second flow channel (6) gradually decreases.

6. A liquid cooling plate according to claim 4, characterized in that: The width of the second flow channel (6) ranges from 23 mm to 39 mm.

7. The liquid cooling plate according to claim 1, characterized in that: The width of the first flow channel (5) ranges from 10.5 mm to 19.5 mm.

8. The liquid cooling plate according to claim 1, characterized in that: The cross-sectional areas of the first flow channels (5) are different from each other.

9. The liquid cooling plate according to claim 1, characterized in that: The strip-shaped structural member (4) is spaced apart from the side edge of the plate body (1).

10. A liquid cooling plate according to any one of claims 1 to 9, characterized in that: The plate body (1) is provided with a first extension portion and a second extension portion at opposite ends, respectively; the first liquid flow port (2) is provided at the first extension portion, and the second liquid flow port (3) is provided at the second extension portion.

11. A liquid-cooled battery pack, characterized in that: A liquid cooling plate comprising any one of claims 1 to 10, further comprising a liquid cooling box (7), wherein the liquid cooling box (7) is adaptably connected to the liquid cooling plate, wherein the first liquid flow port (2) is connected to a liquid inlet pipe (8), and the second liquid flow port (3) is connected to a liquid discharge pipe (9).

12. A liquid-cooled battery pack, characterized in that: A liquid cooling plate comprising the method according to any one of claims 4 to 6, further comprising a liquid cooling box (7), wherein the liquid cooling box (7) is adaptably connected to the liquid cooling plate, a liquid inlet pipe (8) is arranged in the middle of the liquid cooling box (7), and the first liquid flow port (2) and the second liquid flow port (3) are both connected to a liquid discharge pipe (9).

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