WO2024114446A1 - Liquid cooling plate, liquid cooling system, and battery pack - Google Patents

Abstract

A liquid cooling plate, a liquid cooling system, and a battery pack. The liquid cooling plate (1) comprises: a plate body (11), wherein an accommodating cavity (112) for accommodating a cooling liquid is provided in the plate body (11), a plurality of through holes (111) communicated with the accommodating cavity (112) are provided on the outer surface of the plate body (11), and the through holes (111) are spaced apart; hot melt members (12), wherein each through hole (111) is provided with one hot melt member (12) for blocking the through hole (111); and a linkage mechanism (13), wherein the linkage mechanism (13) is provided in the accommodating cavity (112), the linkage mechanism (13) is connected to each hot melt member (12), and the linkage mechanism (13) is configured such that, when the at least one hot melt member (12) melts, the linkage mechanism (13) is released to drive at least part of at least some of the remaining hot melt members (12) to open the corresponding through holes (111).

Description

Liquid cooling plate, liquid cooling system and battery pack

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with application numbers 202211528462.1 and 202211529774.4 and filing date November 30, 2022, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby introduced into this application as a reference.

Technical Field

The present application relates to the field of battery technology, and in particular to a liquid cooling plate, a liquid cooling system and a battery pack.

Background technique

During the operation of the battery pack, the battery cells may experience abnormal conditions such as overcharging, overheating, internal short circuit, extrusion or impact. Under these abnormal conditions, the battery cells are prone to the risk of thermal runaway or even fire. At the same time, after a single battery cell catches fire, it will trigger thermal runaway of other battery cells inside the battery module, and then cause a larger range of fires or even explosions.

Summary of the invention

The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a liquid cooling plate, wherein the hot melt component of the liquid cooling plate is melted to open the corresponding through hole, so that the cooling liquid in the accommodating cavity flows out from the through hole, thereby achieving rapid cooling.

The present application also proposes a liquid cooling system, which includes the above-mentioned liquid cooling plate.

The present application also proposes a battery pack, wherein the liquid cooling system includes the above-mentioned liquid cooling system.

According to the liquid cooling plate of the embodiment of the present application, it includes: a plate body, wherein the plate body has a accommodating cavity for accommodating cooling liquid, and the outer surface of the plate body has a through hole connected to the accommodating cavity, and the through holes are multiple and spaced apart; a hot melt component, each of the through holes is provided with the hot melt component for sealing the through hole; a linkage mechanism, the linkage mechanism is arranged in the accommodating cavity, the linkage mechanism is connected to each of the hot melt components, and the linkage mechanism is configured to be released when at least one of the hot melt components is melted and drives at least part of the remaining hot melt components to at least partially open the corresponding through holes.

According to the liquid cooling plate of the embodiment of the present application, the plate body has a receiving cavity for receiving the cooling liquid, the outer surface of the plate body has a through hole connected to the receiving cavity, the through holes are multiple and spaced apart, each through hole is provided with a hot melt component for blocking the through hole, when the temperature of the environment where some of the multiple hot melt components on the liquid cooling plate are located gradually rises to a temperature greater than or equal to the melting point of the hot melt components, the part of the hot melt components is melted, so that the through holes corresponding to the melted hot melt components are opened, and the through holes located in the receiving cavity are closed. The cooling liquid in the cavity flows out from the opened through-holes, thereby achieving rapid cooling. Then, a linkage mechanism is arranged in the accommodating cavity and connected to each hot melt component. The linkage mechanism is released and drives at least part of the remaining hot melt components to open corresponding through-holes, so that the corresponding through-holes are opened in sequence by the linkage mechanism, thereby increasing the speed of the cooling liquid in the accommodating cavity flowing out and improving the cooling effect.

In some embodiments of the present application, the linkage mechanism includes: a plurality of spring clips, the plurality of spring clips corresponding one-to-one to the plurality of through holes, the two ends of each spring clip in the length direction are respectively a first end and a second end, the first end is connected to the inner wall of the accommodating cavity, and the second end is connected to the corresponding hot melt component, when the spring clip is in a connected state with the hot melt component and all the hot melt components are located in the through hole, the second end has a tendency to move in a direction away from the hot melt component, and the plurality of spring clips are arranged in sequence, and after the second end of one of the spring clips is released, it moves toward the next spring clip and contacts with the next spring clip to drive the next spring clip to drive the corresponding hot melt component to open the corresponding through hole.

In some embodiments of the present application, the plurality of through holes are spaced apart along the circumferential direction of the plate body, and the plurality of spring sheets are spaced apart along the circumferential direction of the plate body.

In some embodiments of the present application, the first end of each of the spring pieces is connected to the inner circumferential wall of the accommodating cavity. When the spring piece is connected to the hot melt component and the hot melt component is located in the through hole, the angle between the spring piece and the inner circumferential wall of the accommodating cavity is 10°-50°. When the spring piece is in a free state, the angle between the spring piece and the inner circumferential wall of the accommodating cavity is 70°-110°.

In some embodiments of the present application, the linkage mechanism further includes: a plurality of steel cables, and the second end of each of the spring pieces is connected to the hot melt component via one of the steel cables.

In some embodiments of the present application, the spring piece is a high-carbon steel piece.

In some embodiments of the present application, at least one surface of the hot melt component in the thickness direction has an annular groove extending along the circumferential direction of the hot melt component, the annular groove divides the hot melt component into a moving part and a fixed part located outside the moving part, and the linkage mechanism is connected to the moving part.

In some embodiments of the present application, a protrusion is provided on the peripheral wall of the movable portion, a notch matching with the protrusion is provided on the inner peripheral wall of the fixed portion, and the linkage mechanism is connected to the protrusion.

In some embodiments of the present application, at least part of the hot melt component has a cavity therein, and the cavity is filled with salt powder. After the through hole is opened, the cavity of the hot melt component having the cavity is opened.

In some embodiments of the present application, the salt powder is CuCl2 or CuSo4.

In some embodiments of the present application, the number of the hot melt components having the cavity is multiple and the components are evenly spaced apart along the circumferential direction of the plate body.

In some embodiments of the present application, the through hole having the cavity where the hot melt component is located is larger than the through hole without the cavity. The through hole size of the cavity where the hot melt component is located.

In some embodiments of the present application, the through hole is a circular through hole.

In some embodiments of the present application, the plurality of through holes are disposed on the same surface of the plate.

In some embodiments of the present application, the hot melt part is an ABS part.

The liquid cooling system according to the embodiment of the present application includes the above-mentioned liquid cooling plate.

According to the liquid cooling system of the embodiment of the present application, a liquid cooling plate is provided, wherein the plate body has a receiving cavity for receiving cooling liquid, and the outer surface of the plate body has a through hole connected to the receiving cavity, wherein the through holes are multiple and spaced apart, and each through hole is provided with a hot melt for blocking the through hole, and when the temperature of the environment where some of the multiple hot melts on the liquid cooling plate are located gradually rises to a temperature greater than or equal to the melting point of the hot melt, the part of the hot melt is melted, so that the through hole corresponding to the melted hot melt is opened, and the cooling liquid in the receiving cavity flows out from the opened through hole, thereby achieving rapid cooling and temperature reduction. Then, a linkage mechanism is provided in the receiving cavity and connected to each hot melt, and the linkage mechanism is released and drives at least part of the remaining hot melts to open the corresponding through holes, so that the corresponding through holes are opened in sequence by the linkage mechanism, thereby increasing the speed at which the cooling liquid in the receiving cavity flows out, and improving the cooling and temperature reduction effect of the liquid cooling system.

According to the battery pack of the embodiment of the present application, the battery pack includes: a shell; a battery module, wherein the battery module is disposed in the shell; and the above-mentioned liquid cooling system, wherein the liquid cooling plate is disposed in the shell and is attached to the battery module.

According to the battery pack of the embodiment of the present application, a liquid cooling system is provided, and the liquid cooling plate is provided in the shell and is attached to the battery module. The plate body has a receiving cavity for containing cooling liquid, and the outer surface of the plate body has a through hole connected to the receiving cavity. The through holes are multiple and spaced apart, and each through hole is provided with a hot melt component for sealing the through hole. When the battery module is working normally, the liquid cooling system cools the battery module through the cooling liquid flowing in the receiving cavity of the liquid cooling plate, thereby realizing heat dissipation of the battery pack. When an abnormal condition occurs in the battery module, part of the hot melt components are melted so that the through holes corresponding to the melted hot melt components are opened, and the coolant in the accommodating cavity flows out from the opened through holes, thereby cooling the battery module. Then, a linkage mechanism is arranged in the accommodating cavity and connected to each hot melt component. The linkage mechanism is released and drives at least part of the remaining hot melt components to at least partially open the corresponding through holes, so that the corresponding through holes are opened in turn by the linkage mechanism, thereby increasing the speed at which the coolant in the accommodating cavity flows out, improving the cooling effect of the liquid cooling system, delaying the heat spread speed of the battery module, reducing the possibility of flames directly breaking through the outer shell of the battery pack and causing an explosion, and improving the safety of the battery pack.

In some embodiments of the present application, it also includes: a partition assembly, which is arranged in the shell to divide the space inside the shell into a plurality of spaced-apart sub-spaces, the battery module includes a plurality of sub-modules, and the plurality of sub-modules are respectively arranged in the plurality of sub-spaces, and there are a plurality of liquid cooling plates, and the plurality of liquid cooling plates are respectively arranged in the plurality of sub-spaces and fit with the corresponding sub-modules.

In some embodiments of the present application, the liquid cooling plate is disposed on a side of the sub-module, and the through hole is disposed on a surface of the plate body facing the sub-module.

Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

FIG1 is a structural diagram of a battery pack according to an embodiment of the present application;

FIG2 is a structural diagram of a liquid cooling system according to an embodiment of the present application;

Fig. 3 is an enlarged view of point F in Fig. 1;

FIG4 is a structural diagram of a liquid cooling plate according to an embodiment of the present application;

FIG5 is a diagram of the internal structure of a liquid cooling plate according to an embodiment of the present application, wherein all through holes are not opened;

Fig. 6 is an enlarged view of point A in Fig. 5;

FIG7 is a diagram of the internal structure of a liquid cooling plate according to an embodiment of the present application, wherein a through hole is opened;

FIG8 is an enlarged view of point B in FIG7;

FIG9 is a diagram of the internal structure of a liquid cooling plate according to an embodiment of the present application, wherein two through holes are opened;

FIG10 is an enlarged view of point C in FIG9;

FIG11 is an enlarged view of point D in FIG9 ;

FIG12 is a diagram showing the internal structure of a liquid cooling plate according to an embodiment of the present application, wherein all through holes are opened;

FIG13 is an enlarged view of point E in FIG12;

FIG. 14 is a structural diagram of a sub-module according to an embodiment of the present application.

Reference numerals:
1000, battery pack;
100. Liquid cooling system;
1. Liquid cooling plate; 11. Plate body; 111. Through hole; 112. Accommodating cavity; 113. Liquid inlet; 114. Liquid outlet; 12.
Hot melt component; 12a, first hot melt component; 12b, second hot melt component; 121, annular groove; 122, moving part; 1221, protrusion; 123, fixing part; 1231, notch; 134, cavity; 13, linkage mechanism; 131, spring piece; 131a, first spring piece; 131b, second spring piece; 131c, third spring piece; 1311, first end; 1312, second end; 132, steel cable;
2. Cooling pipe; 21. Connecting pipe; 22. Liquid inlet pipe; 23. Liquid outlet pipe;
200, housing;
300, battery module; 301, submodule; 3011, battery cell; 3012, end plate; 3013, annular cable tie;
400, partition assembly;
500. Subspace.

Detailed ways

The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

The liquid cooling plate 1 according to an embodiment of the present application is described below with reference to the accompanying drawings.

As shown in FIGS. 4 to 10 , a liquid cooling plate 1 according to an embodiment of the present application includes a plate body 11 , a hot melt component 12 and a linkage mechanism 13 .

Specifically, the plate body 11 has a receiving cavity 112 for receiving the cooling liquid, so that the liquid cooling plate 1 has a relatively low temperature, so that the liquid cooling plate 1 can cool down the device attached thereto. For example, when the liquid cooling plate 1 is applied to the battery pack 1000, when the battery pack 1000 is working normally, the liquid cooling plate 1 is used to cool down the battery module 300 in the housing 200 of the battery pack 1000, and take away the heat emitted by the battery module 300, thereby achieving heat dissipation of the battery module 300 and ensuring the performance of the battery pack 1000.

As shown in FIG4 , the outer surface of the plate body 11 has a through hole 111 connected to the accommodating cavity 112. The through holes 111 are multiple and spaced apart. A hot melt 12 is provided in each through hole 111 to block the through hole 111. It can be understood that when the temperature of the environment where the liquid cooling plate 1 is located is lower than the melting point of the hot melt 12, the hot melt 12 blocks the through hole 111, and the liquid cooling plate 1 cools down the device attached to it; when the environment where some of the multiple hot melts 12 on the liquid cooling plate 1 are ... When the temperature gradually increases to be greater than or equal to the melting point of the hot melt component 12, the part of the hot melt component 12 is melted, so that the through hole 111 corresponding to the melted hot melt component 12 is opened, and the cooling liquid in the accommodating cavity 112 flows out from the opened through hole 111, thereby realizing rapid cooling of the device attached to the liquid cooling plate 1, and improving the safety of the device using the liquid cooling plate 1.

For example, when the liquid cooling plate 1 is applied to the battery pack 1000, when an abnormal condition occurs inside the battery pack 1000, such as when the battery pack 1000 has thermal runaway, the released high-temperature smoke and other erupting gases melt part of the hot melt component 12, so that the through hole 111 corresponding to the melted hot melt component 12 is opened, and the coolant in the accommodating cavity 112 flows out from the opened through hole 111, and the battery pack 1000 is quickly cooled and cooled by evaporation heat exchange, flow heat transfer, etc., thereby slowing down the heat spread speed of the battery pack 1000, reducing the possibility of the flame directly breaking through the outer shell of the battery pack 1000 and causing an explosion, thereby improving the safety of the battery pack 1000 using the liquid cooling plate 1.

Furthermore, there are multiple liquid cooling plates 1, and the battery pack 1000 includes a battery module 300. Each sub-module 301 constituting the battery module 300 is bonded to at least one liquid cooling plate 1, and each battery cell 3011 constituting the sub-module 301 is in contact with at least one hot melt component 12. Therefore, when thermal runaway occurs in any battery cell 3011, the temperature is transferred to the corresponding hot melt component 12 to melt it to open the through hole 111, and the cooling liquid flows out from the opened through hole 111 to the corresponding sub-module 301, thereby slowing down the heat spread speed of the battery cell 3011 and further improving safety.

As shown in FIG6 , the linkage mechanism 13 is disposed in the accommodating cavity 112, and the linkage mechanism 13 is connected to each hot melt component 12. The linkage mechanism 13 is configured such that when at least one hot melt component 12 melts, the linkage mechanism 13 is released and drives at least part of the remaining hot melt components 12 to open corresponding through holes 111. Thus, when at least one hot melt component 12 melts, the linkage mechanism 13 is released and drives at least part of the remaining hot melt components 12 to open corresponding through holes 111, so that at least part of the through holes 111 are opened in sequence, and the coolant flows out from the opened through holes 111, thereby increasing the speed at which the coolant in the accommodating cavity 112 flows out, and improving the cooling effect.

For example, when the liquid cooling plate 1 is applied to the battery pack 1000, when an abnormal condition occurs inside the battery pack 1000, such as the battery pack 1000 releases high-temperature smoke when thermal runaway occurs, causing the temperature inside the battery pack 1000 to rise locally, and the hot melt component 12 located in the high-temperature area melts. At this time, the linkage mechanism 13 is released, and the linkage mechanism 13 can drive at least part of the remaining at least part of the hot melt components 12 to open the corresponding through holes 111 in sequence, and the coolant flows from the opened through holes 111 to the shell 200 of the battery pack 1000, thereby increasing the speed at which the coolant flows out, and achieving rapid cooling of the battery pack 1000.

Further, as shown in FIG1 , the housing 200 of the battery pack 1000 is divided into a plurality of sub-spaces 500 by a plurality of partition assemblies 400 disposed in the housing 200. The plurality of sub-spaces 500 are independent of each other. The plurality of sub-modules 301 constituting the battery module 300 are disposed in the plurality of sub-spaces 500, respectively. There are a plurality of liquid cooling plates 1, and the plurality of liquid cooling plates 1 are disposed in the plurality of sub-spaces 500 and are attached to the corresponding sub-modules 301. When thermal runaway occurs, after at least one hot melt component 12 of the liquid cooling plate 1 opposite thereto is melted by erupting gases such as high-temperature flue gas, the linkage mechanism 13 drives at least part of the remaining hot melt components 12 of the liquid cooling plate 1 to open the corresponding through holes 111 in sequence, and the coolant flows out from the opened through holes 111 to the sub-module 301, and is respectively arranged in a plurality of sub-spaces 500 through each sub-module 301, so that the coolant only fills the sub-space 500 where the sub-module 301 having thermal runaway is located, and does not flow to other sub-spaces 500, thereby achieving rapid immersion of the coolant in the entire sub-module 301, and achieving rapid cooling without affecting other sub-modules 301.

It should be noted that, except for the first hot melt component 12 that is heated and melted to open the corresponding through hole 111 , the remaining hot melt components 12 can be driven by the linkage mechanism 13 to open the corresponding through holes 111 or directly heated and melted to open the corresponding through holes 111 .

According to the liquid cooling plate 1 of the embodiment of the present application, a receiving cavity 112 for receiving cooling liquid is provided in the plate body 11, and a through hole 111 connected to the receiving cavity 112 is provided on the outer surface of the plate body 11, and the through holes 111 are multiple and spaced apart. A hot melt component 12 is provided in each through hole 111 for sealing the through hole 111. When the temperature of the environment in which some of the multiple hot melt components 12 on the liquid cooling plate 1 are located gradually increases to a temperature greater than or equal to the melting point of the hot melt component 12, the part of the hot melt component 12 is melted, so that the through hole 111 corresponding to the melted hot melt component 12 is opened, and the cooling liquid in the receiving cavity 112 flows out from the opened through hole 111, thereby achieving rapid cooling and temperature reduction. Then, a linkage mechanism 13 is arranged in the accommodating cavity 112 and connected to each hot melt component 12. The linkage mechanism 13 is released and drives at least part of the remaining hot melt components 12 to at least partially open the corresponding through holes 111, so that the corresponding through holes 111 are opened in turn by the linkage mechanism 13, thereby increasing the speed at which the coolant in the accommodating cavity 112 flows out and improving the cooling effect.

In some embodiments of the present application, as shown in FIG. 5 to FIG. 9 , the linkage mechanism 13 includes a plurality of spring pieces 131. The plurality of spring pieces 131 correspond to the plurality of through holes 111 one by one, and the two ends of each spring piece 131 in the length direction are respectively a first end 1311 and a second end 1312, the first end 1311 is connected to the inner wall of the accommodating cavity 112, and the second end 1312 is connected to the corresponding hot melt component 12. When the spring piece 131 is connected to the hot melt component 12 and all the hot melt components 12 are located in the through hole 111, the second end 1312 has a tendency to move away from the hot melt component 12. The plurality of spring pieces 131 are arranged in sequence, and after the second end 1312 of one of the spring pieces 131 is released, it moves toward the next spring piece 131 and contacts the next spring piece 131 to drive the next spring piece 131 to drive the corresponding hot melt component 12 to open the corresponding through hole 111.

It can be understood that, as shown in Figures 5 to 8, since the second end 1312 of the spring 131 has a tendency to move in the direction away from the hot melt component 12, after the first hot melt component 12 is heated and melted, the second end 1312 of the first spring piece 131 (the first spring piece 131a as shown in Figure 8) is released, and the first spring piece 131 converts elastic potential energy into kinetic energy. As a result, the second end 1312 of the first spring piece 131 moves toward the second spring piece 131 and contacts the second spring piece 131 (the second spring piece 131b as shown in Figure 8) to drive the second spring piece 131 to drive the corresponding hot melt component 12 to open the corresponding through hole 111.

At the same time, as shown in FIG. 9 and FIG. 10, the second spring piece 131 drives the corresponding hot melt member 12 to open the corresponding passage. After the through hole 111 is opened, the second end 1312 of the second spring piece 131 is released, and the second spring piece 131 converts the elastic potential energy into kinetic energy, whereby the second end 1312 of the second spring piece 131 moves toward the third spring piece 131 (the third spring piece 131c shown in FIG. 10 ) and contacts the third spring piece 131 to drive the third spring piece 131 to drive the corresponding hot melt component 12 to open the corresponding through hole 111, and then drive the next spring piece 131 in sequence. Until the multiple spring pieces 131 arranged in sequence in the back drive the corresponding hot melt component 12 to open the corresponding through hole 111 one by one, thereby realizing the linkage triggering of the multiple spring pieces 131, so that the coolant can flow out from more through holes 111, thereby increasing the speed of the coolant flowing out of the accommodating cavity 112, and then improving the cooling effect of the liquid cooling plate 1.

In addition, the mechanical triggering method in which the second end 1312 of one of the springs 131 is released and moves toward the next spring 131 and contacts the next spring 131 to drive the next spring 131 to drive the corresponding hot melt 12 to open the corresponding through hole 111 is more reliable than circuit control. For example, when the liquid cooling plate 1 is applied to the battery pack 1000, in the case that the battery pack 1000 has thermal runaway and the circuit is burned, the corresponding hot melt 12 can still be driven one by one by multiple springs 131 to open the corresponding through hole 111 so that the coolant can quickly flow out of more through holes 111, thereby improving the reliability of the liquid cooling plate 1.

In some embodiments of the present application, as shown in FIG. 5, FIG. 7, FIG. 9 and FIG. 12, a plurality of through holes 111 are spaced apart along the circumferential direction of the plate body 11, and a plurality of spring pieces 131 are spaced apart along the circumferential direction of the plate body 11. Thus, through such an arrangement, after the second end 1312 of at least one spring piece 131 is released, each of the remaining spring pieces 131 will be driven one by one to drive the corresponding hot melt component 12 to open the corresponding through hole 111, so that each through hole 111 is opened, so that the coolant in the accommodating cavity 112 can flow out from each through hole 111, thereby increasing the speed of the coolant outflow and ensuring the cooling effect of the liquid cooling plate 1.

For example, as shown in FIG1 , when the liquid cooling plate 1 is applied to the battery pack 1000, there are multiple liquid cooling plates 1, and multiple through holes 111 are spaced apart along the circumferential direction of the plate body 11. The liquid cooling plate 1 is arranged on the side of the sub-module 301. Thus, when thermal runaway occurs in any sub-module 301, the multiple through holes 111 are spaced apart along the circumferential direction of the plate body 11, so that the coolant is discharged from the accommodating cavity 112 as much as possible through the through holes 111 at the lowest point along the height direction of the sub-module 301, thereby achieving more efficient cooling.

In some embodiments of the present application, as shown in Figure 6, the first end 1311 of each spring piece 131 is connected to the inner circumferential wall of the accommodating cavity 112. When the spring piece 131 is connected to the hot melt component 12 and the hot melt component 12 is located in the through hole 111, the angle between the spring piece 131 and the inner circumferential wall of the accommodating cavity 112 is 10°-50°. When the spring piece 131 is in a free state, the angle between the spring piece 131 and the inner circumferential wall of the accommodating cavity 112 is 70°-110°.

It can be understood that when the spring piece 131 is connected to the hot melt member 12 and the hot melt member 12 is located in the through hole 111, the angle between the spring piece 131 and the inner peripheral wall of the accommodating cavity 112 is 10°, 15°, 20°, 25°, 30°, 35°, 40° or 50°, and the angle between the spring piece 131 and the inner peripheral wall of the accommodating cavity 112 is 10°, 15°, 20°, 25°, 30°, 35°, 40° or 50° when the spring piece 131 is in a free state. 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105° or 110°. Thus, the linkage triggering between each spring piece 131 is realized by such an angle setting, so that the second end 1312 of one spring piece 131 moves toward the next spring piece 131 after being released and contacts with the next spring piece 131 to drive the next spring piece 131 to drive the corresponding hot melt part 12 to open the corresponding through hole 111.

In some embodiments of the present application, when the spring clip 131 is connected to the hot melt component 12 and the hot melt component 12 is located in the through hole 111, the angle between the spring clip 131 and the inner circumferential wall of the accommodating cavity 112 is 30°, and when the spring clip 131 is in a free state, the angle between the spring clip 131 and the inner circumferential wall of the accommodating cavity 112 is 90°.

In some embodiments of the present application, as shown in FIG6 , the linkage mechanism 13 further includes a plurality of steel cables 132. The second end 1312 of each spring piece 131 is connected to the hot melt piece 12 via a steel cable 132. Thus, in the process of the spring piece 131 being driven to drive the hot melt piece 12 to open the through hole 111, the driving force received by the spring piece 131 is transmitted to the hot melt piece 12 via the steel cable 132 to open the through hole 111. The provision of the steel cable 132 enhances the reliability of the connection between the spring piece 131 and the hot melt piece 12 and the force transmission process.

In some embodiments of the present application, the spring pieces 131 are high-carbon steel parts. Since high-carbon steel has high strength and wear resistance after heat treatment and cold drawing hardening, has certain flexibility and plasticity, and has low cost, by setting the spring pieces 131 to be high-carbon steel parts, the cost of the liquid cooling plate 1 can be reduced while the linkage triggering between each spring piece 131 is met.

In some embodiments of the present application, as shown in Figures 6 and 10, and as shown in Figures 11 and 13, at least one surface in the thickness direction of the hot melt component 12 has an annular groove 121 extending along the circumferential direction of the hot melt component 12, and the annular groove 121 divides the hot melt component 12 into a movable part 122 and a fixed part 123 located outside the movable part 122, and the linkage mechanism 13 is connected to the movable part 122.

It can be understood that the hot melt 12 has an annular groove 121 extending in the circumferential direction of the hot melt 12 on the surface facing the accommodating cavity 112, or the hot melt 12 has an annular groove 121 extending in the circumferential direction of the hot melt 12 on the surface facing away from the accommodating cavity 112, or the hot melt 12 has an annular groove 121 extending in the circumferential direction of the hot melt 12 on the surfaces facing and away from the accommodating cavity 112. When the temperature of the environment where the liquid cold plate 1 is located is lower than the melting point of the hot melt 12, the moving part 122 is connected to the fixed part 123, the hot melt 12 blocks the through hole 111, and the liquid cold plate 1 cools down the device attached thereto.

When the temperature of the environment where some of the multiple hot melt components 12 on the liquid cooling plate 1 are located gradually rises to a temperature greater than or equal to the melting point of the hot melt components 12, the hot melt components 12 are melted, so that the linkage mechanism 13 is released and drives the moving part 122 of at least some of the remaining hot melt components 12 to separate from the fixed part 123, so that the hot melt components 12 open the corresponding through holes 111, so that the cooling liquid in the accommodating cavity 112 flows out from the opened through holes 111 to the device attached to the liquid cooling plate 1. Therefore, the connection between the moving part 122 and the fixed part 123 is relatively weak through the setting of the annular groove 121, which facilitates the linkage mechanism 13 to drive the moving part 122 to separate from the fixed part 123, thereby improving the reliability of the liquid cooling plate 1.

Further, the linkage mechanism 13 includes a plurality of spring pieces 131. The plurality of spring pieces 131 correspond to the plurality of through holes 111 one by one, and the two ends of each spring piece 131 in the length direction are respectively a first end 1311 and a second end 1312, the first end 1311 is connected to the inner wall of the accommodating cavity 112, and the second end 1312 is connected to the corresponding moving part 122 of the hot melt component 12, when the spring piece 131 is connected to the hot melt component 12 and all the hot melt components 12 are located in the through hole 111, the second end 1312 has a tendency to move from one end of the moving part 122 connected to the spring piece 131 to the other end, and the plurality of spring pieces 131 are arranged in sequence, and after the second end 1312 of one of the spring pieces 131 is released, it moves toward the next spring piece 131 and contacts the next spring piece 131 to drive the next spring piece 131 to drive the corresponding moving part 122 to separate from the fixed part 123, thereby realizing that the hot melt component 12 opens the corresponding through hole 111. Therefore, the provision of the annular groove 121 facilitates the second end 1312 to drive the moving portion 122 to separate from the fixing portion 123 , so as to open the through hole 111 .

In some embodiments of the present application, as shown in FIG6 and FIG10, the peripheral wall of the movable part 122 has a protrusion 1221, the inner peripheral wall of the fixed part 123 has a notch 1231 that matches the protrusion 1221, and the linkage mechanism 13 is connected to the protrusion 1221. Therefore, when the temperature of the environment where some of the multiple hot melts 12 on the liquid cooling plate 1 are located gradually rises to a temperature greater than or equal to the melting point of the hot melt 12, the part of the hot melt 12 is melted, so that the linkage mechanism 13 is released and drives the protrusion 1221 of at least part of the remaining hot melt 12 to separate from the fixed part 123, thereby driving the movable part 122 to separate from the fixed part 123, and then realizing that the hot melt 12 opens the corresponding through hole 111, so that the cooling liquid in the accommodating cavity 112 flows from the opened through hole 111, thereby realizing rapid cooling and cooling of the device attached to the liquid cooling plate 1. At the same time, the setting of the protrusion 1221 makes it easier for the linkage mechanism 13 to drive the moving part 122 of the hot melt component 12 to separate from the fixing part 123 to open the corresponding through hole 111, thereby improving the reliability of the liquid cooling plate 1.

Furthermore, as shown in the figure, the linkage mechanism 13 includes a plurality of spring sheets 131 and a plurality of steel cables 132 . Among them, multiple spring pieces 131 correspond to multiple through holes 111 one by one, and the two ends of each spring piece 131 in the length direction are respectively a first end 1311 and a second end 1312, the first end 1311 is connected to the inner wall of the accommodating cavity 112, and the second end 1312 is connected to the protrusion 1221 of the hot melt component 12 through a steel cable 132. When the spring piece 131 is connected to the hot melt component 12 and all the hot melt components 12 are located in the through hole 111, the second end 1312 has a tendency to move from the protrusion 1221 of the moving part 122 to the direction away from the end of the protrusion 1221. Multiple spring pieces 131 are arranged in sequence. After the second end 1312 of one of the spring pieces 131 is released, it moves toward the next spring piece 131 and contacts the next spring piece 131 to drive the next spring piece 131 to drive the corresponding protrusion 1221 to separate from the fixed part 123, thereby driving the moving part 122 to separate from the fixed part 123, and then realizing the hot melt component 12 to open the corresponding through hole 111.

In some embodiments of the present application, as shown in FIGS. 4 and 9 to 13, at least part of the hot melt 12 has a cavity 134, the annular groove 121 is opposite to the cavity 134, the cavity 134 is filled with salt powder, and the linkage mechanism 13 is configured such that when at least one hot melt 12 is melted, the linkage mechanism 13 is released and drives at least part of the remaining hot melt 12 to open the corresponding through hole 111, and after the hot melt 12 with the cavity 134 opens the through hole 111, the cavity 134 is opened. is opened.

It is understandable that when at least one hot melt component 12 is melted, the linkage mechanism 13 is released and drives at least part of the remaining hot melt components 12 to open the corresponding through holes 111, so that at least part of the through holes 111 are opened in sequence, and the coolant flows out from the opened through holes 111, thereby increasing the speed of the coolant flowing out of the accommodating cavity 112 and improving the cooling effect. At the same time, after the hot melt component 12 with the cavity 134 opens the through hole 111, the cavity 134 is opened, so that the salt powder in the cavity 134 is released and dissolved in the coolant, thereby converting the coolant into a salt solution, further ensuring the cooling effect.

When the temperature of the environment in which some of the multiple hot melts 12 on the liquid cooling plate 1 are located gradually rises to a temperature greater than or equal to the melting point of the hot melt 12, the part of the hot melt 12 is melted, so that the through hole 111 corresponding to the melted hot melt 12 is opened, and the cooling liquid in the accommodating cavity 112 flows out from the opened through hole 111, thereby realizing the rapid cooling and cooling of the device attached to the liquid cooling plate 1, and improving the safety of the device using the liquid cooling plate 1. At the same time, after the hot melt 12 having a cavity 134 and salt powder filled in the cavity 134 is heated and melted, the salt powder in the cavity 134 is released and dissolved in the cooling liquid, so that the cooling liquid is converted into a salt solution, further ensuring the cooling effect. In addition, the salt powder filled in the cavity 134 is in powder form, which is convenient for the salt powder to dissolve in the cooling liquid to form a salt solution, further improving the reliability of the device using the liquid cooling plate 1.

For example, when the liquid cooling plate 1 is applied to the battery pack 1000, when an abnormal condition occurs inside the battery pack 1000, such as when the battery pack 1000 has thermal runaway, high-temperature smoke is released, causing the temperature inside the battery pack 1000 to rise locally, and the hot melt component 12 located in the high-temperature area melts. At this time, the linkage mechanism 13 is released, and the linkage mechanism 13 can drive at least part of the remaining at least part of the hot melt components 12 to open the corresponding through holes 111 in sequence, and the coolant flows from the opened through holes 111 to the shell 200 of the battery pack 1000, thereby increasing the speed at which the coolant flows out, achieving rapid cooling of the battery pack 1000, slowing down the heat spread of the battery pack 1000, reducing the possibility of the flame directly breaking through the shell of the battery pack 1000 and causing an explosion, thereby improving the safety of the battery pack 1000 using the liquid cooling plate 1. At the same time, after the hot melt part 12 having the cavity 134 opens the through hole 111, the cavity 134 is opened, thereby converting the coolant into a salt solution, so that the battery pack 1000 is immersed in the salt solution to slowly release electrical energy until the electricity is drained, thereby completely blocking the possibility of the battery pack 1000 reigniting, and further improving the safety of the battery pack 1000 using the liquid cooling plate 1.

In some embodiments of the present application, the salt powder is CuCl2 or CuSo4. Since CuCl2 and CuSo4 are easily soluble in the coolant, when the hot melt component 12 having the cavity 134 and filled with salt powder is heated and melted, the salt powder in the cavity 134 is released and dissolved in the coolant, so that the coolant is converted into a salt solution, thereby improving the reliability of the liquid cooling plate 1. It should be noted that the salt powder can also be other materials in powder form that are soluble in the coolant.

In some embodiments of the present application, as shown in FIG9 and FIG11 , in some embodiments of the present application, as shown in FIG9 , the hot melt member 12 having the cavity 134 is multiple and evenly spaced along the circumferential direction of the plate body 11 . Thus, By providing multiple hot-melt pieces 12 with cavities 134 and evenly spaced along the circumferential direction of the plate body 11, the hot-melt pieces 12 with cavities 134 can quickly link and open corresponding through holes 111, so that the salt powder in the cavities 134 is released and dissolved in the coolant, thereby realizing the conversion of the coolant into a salt solution at the early stage of thermal runaway of the battery pack 1000, thereby releasing the electrical energy of the battery pack 1000 and further improving safety.

Specifically, when the liquid cooling plate 1 is applied to the battery pack 1000 and the battery pack 1000 has thermal runaway, the hot melt parts 12 with cavities 134 are multiple and evenly spaced along the circumferential direction of the plate body 11, so that the hot melt parts 12 with cavities 134 can quickly link and open the corresponding through holes 111, so that the salt powder in the cavity 134 is released and dissolved in the coolant, thereby realizing the conversion of the coolant into a salt solution in the early stage of thermal runaway of the battery pack 1000, thereby releasing the electrical energy of the battery pack 1000 and further improving safety.

Further, as shown in FIG11 , the plate body 11 is square, and there are four hot melt members 12 with cavities 134 (the first hot melt member 12a shown in FIG11 ) and they are respectively arranged at the four diagonal positions of the liquid cooling plate 1, and the hot melt members 12 without cavities 134 (the second hot melt member 12b shown in FIG11 ) are evenly spaced along the circumferential direction of the plate body 11. Thus, through such an arrangement, at the initial stage of thermal runaway of the battery pack 1000, the hot melt member 12 with cavities 134 is driven by the linkage mechanism 13 to open the corresponding through hole 111 and cavity 134, and the processing and production of the liquid cooling plate 1 is facilitated.

In some embodiments of the present application, as shown in FIG11 , the size of the through hole 111 where the hot melt component 12 having the cavity 134 (the first hot melt component 12a shown in FIG11 ) is located is larger than the size of the through hole 111 where the hot melt component 12 not having the cavity 134 (the second hot melt component 12b shown in FIG11 ) is located. Thus, such a setting facilitates the release of the salt powder filled in the cavity 134, ensures that the salt powder dissolves into the coolant to form a salt solution, and further improves the reliability of the liquid cooling plate 1.

In some embodiments of the present application, as shown in FIG10 , the through hole 111 is a circular through hole. Thus, such a configuration facilitates the opening of the through hole 111 on the plate body 11, reduces the process difficulty and production cost, and improves the production efficiency of the liquid cooling plate 1. Furthermore, the hot melt 12 is a circular structure, so that the hot melt 12 can easily block the through hole 111.

In some embodiments of the present application, as shown in FIG. 4 and FIG. 12 , a plurality of through holes 111 are provided on the same surface of the plate body 11. Thus, by such a setting, when the linkage mechanism 13 is released and drives at least part of the remaining hot melt components 12 to at least partially open, the corresponding through holes 111 are located on the same surface, so that the coolant in the accommodating cavity 112 flows out from the same direction, further ensuring the outflow speed of the coolant, and realizing rapid cooling.

In some embodiments of the present application, the hot melt component 12 is an ABS (Acrylonitrile butadiene Styrene copolymers). It is understandable that, since ABS has good comprehensive physical and mechanical properties at room temperature and is wear-resistant, chemically resistant, and corrosion-resistant, when the liquid cooling plate 1 is at room temperature, the hot melt component 12 is used to block the through hole 111 and connect to the linkage mechanism 13; when the ambient temperature of the liquid cooling plate 1 reaches the melting point of ABS, the hot melt component 12 is heated and melted to open the corresponding through hole 111, and the linkage drive connected to it is released and drives at least part of the remaining hot melt components 12 to open the corresponding through hole 111, so as to ensure the liquid cooling. Reliability of board 1.

For example, when the liquid cooling plate 1 is applied to the battery pack 1000, when the battery pack 1000 is working normally, the environment where the liquid cooling plate 1 is located is lower than the melting point of ABS, and the hot melt component 12 is used to block the through hole 111. The liquid cooling plate 1 cools down the battery pack 1000 to achieve heat dissipation of the battery pack 1000 and ensure the performance of the battery pack 1000. When an abnormal condition occurs inside the battery pack 1000, such as when the battery pack 1000 has thermal runaway, when the high-temperature flue gas and other erupting gases released reach the melting point of ABS, the hot melt component 12 is heated and melted to open the through hole 111, and the coolant in the accommodating cavity 112 flows out from the opened through hole 111, and the battery pack 1000 is quickly cooled down by evaporation heat exchange, flow heat transfer, etc.

It should be noted that the hot melt component 12 can also be made of a hot melt material that is fixed at room temperature and has a melting point of about 200°.

The liquid cooling system 100 according to an embodiment of the present application is described below.

According to the liquid cooling system 100 of the embodiment of the present application, as shown in FIG. 2 , the liquid cooling system 100 includes the above-mentioned liquid cooling plate 1 .

According to the liquid cooling system 100 of the embodiment of the present application, a liquid cooling plate 1 is provided, wherein a plate body 11 has a receiving cavity 112 for receiving cooling liquid, and an outer surface of the plate body 11 has a through hole 111 connected to the receiving cavity 112, wherein the through holes 111 are multiple and spaced apart, and each through hole 111 is provided with a hot melt component 12 for sealing the through hole 111. When the temperature of an environment in which some of the multiple hot melt components 12 on the liquid cooling plate 1 are located gradually increases to a temperature greater than or equal to the melting point of the hot melt component 12, the part of the hot melt component 12 is melted, so that the through hole 111 corresponding to the melted hot melt component 12 is opened, and the cooling liquid in the receiving cavity 112 flows out from the opened through hole 111, thereby achieving rapid cooling and temperature reduction. Then, through the linkage mechanism 13 disposed in the accommodating cavity 112 and connected to each hot melt component 12, the linkage mechanism 13 is released and drives at least part of the remaining hot melt components 12 to at least partially open the corresponding through holes 111, so that the corresponding through holes 111 are opened in turn by the linkage mechanism 13, thereby increasing the speed at which the coolant in the accommodating cavity 112 flows out, and improving the cooling effect of the liquid cooling system 100.

In some embodiments of the present application, as shown in Figures 3 and 4, there are multiple liquid cooling plates 1, and the liquid cooling system 100 also includes a cooling pipe 2, the cooling pipe 2 includes a connecting pipe 21, a liquid inlet pipe 22 and a liquid outlet pipe 23, and each liquid cooling plate 1 has a liquid inlet 113 and a liquid outlet 114 connected to the accommodating cavity 112 on the plate body 11, and the multiple liquid cooling plates 1 are connected in series through the connecting pipe 21. Along the flow direction of the coolant, the liquid inlet 113 of the liquid cooling plate 1 located at the upstream end is connected to the liquid inlet pipe 22, and the liquid outlet 114 of the liquid cooling plate 1 located at the downstream end is connected to the liquid outlet pipe 23. Thus, the coolant enters the liquid cooling system 100 through the liquid inlet pipe 22, and in turn enters the corresponding accommodating cavity 112 through the liquid inlet 113 of each liquid cooling plate 1, and flows into the connecting pipe 21 through the liquid outlet 114 of each liquid cooling plate 1, until the coolant flows out from the liquid outlet 114 of the liquid cooling plate 1 located at the most upstream end to the liquid outlet pipe 23, thereby realizing the circulation of the coolant in the liquid cooling system 100, and further ensuring the cooling effect of the liquid cooling system 100.

Furthermore, there are multiple liquid inlets 113 and multiple liquid outlets 114. The setting of the liquid port 114 ensures the flow speed of the coolant between the liquid inlet pipe 22 and the liquid cooling plate 1 , the liquid cooling plate 1 and the connecting pipe 21 , and the liquid cooling plate 1 and the liquid outlet pipe 23 , further improving the cooling effect of the liquid cooling system 100 .

The battery pack 1000 according to an embodiment of the present application is described below.

According to the liquid cooling system 100 of the embodiment of the present application, as shown in FIG1 , the battery pack 1000 includes a housing 200, a battery module 300 and the above-mentioned liquid cooling system 100. Among them, the battery module 300 is arranged in the housing 200, and the liquid cooling plate 1 is arranged in the housing 200 and fits with the battery module 300. It can be understood that when the battery module 300 is working normally, the coolant flowing in the accommodating cavity 112 of the liquid cooling plate 1 takes away the heat of the battery module 300, thereby realizing the cooling of the battery module 300 by the liquid cooling system 100, and ensuring the performance of the battery pack 1000. When an abnormal condition occurs in the battery module 300, for example, when the battery pack 1000 experiences thermal runaway, the released high-temperature smoke and other erupting gases melt part of the hot melt parts 12. When at least one hot melt part 12 melts, it is released through the linkage mechanism 13 and drives at least part of the remaining hot melt parts 12 to open the corresponding through holes 111, so that the through holes 111 are opened in turn, and the coolant flows out from the opened through holes 111, thereby increasing the speed at which the coolant in the accommodating cavity 112 flows out, improving the cooling effect of the liquid cooling system 100, thereby delaying the heat spread speed of the battery module 300 and further improving the safety of the battery pack 1000.

According to the battery pack 1000 of the embodiment of the present application, a liquid cooling system 100 is provided, the liquid cooling plate 1 is provided in the shell 200 and is fitted with the battery module 300, the plate body 11 has a accommodating cavity 112 for accommodating cooling liquid, the outer surface of the plate body 11 has a through hole 111 connected to the accommodating cavity 112, the through holes 111 are multiple and spaced apart, each of the through holes 111 is provided with a hot melt part 12 for sealing the through hole 111, when the battery module 300 is working normally, the cooling liquid flowing in the accommodating cavity 112 of the liquid cooling plate 1 is used to realize the liquid cooling system 100 to cool down the battery module 300, thereby realizing the heat dissipation of the battery pack 1000. When an abnormal condition occurs in the battery module 300, part of the hot melt component 12 is melted so that the through hole 111 corresponding to the melted hot melt component 12 is opened, and the coolant in the accommodating cavity 112 flows out from the opened through hole 111, thereby cooling the battery module 300. Then, the linkage mechanism 13 is arranged in the accommodating cavity 112 and connected to each hot melt component 12. The linkage mechanism 13 is released and drives at least part of the remaining hot melt components 12 to at least partially open the corresponding through holes 111, so that the corresponding through holes 111 are opened in turn by the linkage mechanism 13, thereby increasing the speed of the coolant in the accommodating cavity 112 flowing out, improving the cooling effect of the liquid cooling system 100, delaying the heat spread speed of the battery module 300, reducing the possibility of the flame directly breaking through the shell of the battery pack 1000 and causing an explosion, thereby improving the safety of the battery pack 1000.

In some embodiments of the present application, as shown in FIG14 , the battery pack 1000 further includes a partition assembly 400. The partition assembly 400 is disposed in the housing 200 to divide the space in the housing 200 into a plurality of spaced-apart subspaces 500. The battery module 300 includes a plurality of submodules 301, and the plurality of submodules 301 are respectively disposed in the plurality of subspaces 500. There are a plurality of liquid cooling plates 1, and the plurality of liquid cooling plates 1 are respectively disposed in the plurality of subspaces 500 and fit with the corresponding submodules 301.

Thus, when any sub-module 301 experiences thermal runaway, at least one hot melt of the liquid cooling plate 1 opposite to it is When the component 12 is melted by the erupting gas such as high-temperature flue gas, the linkage mechanism 13 drives the remaining at least part of the hot-melt components 12 of the liquid cooling plate 1 to open the corresponding through holes 111 in turn, and the coolant flows out from the opened through holes 111 to the sub-module 301. Each sub-module 301 is respectively arranged in a plurality of sub-spaces 500, so that the coolant only fills the sub-space 500 where the sub-module 301 with thermal runaway is located, and does not flow to other sub-spaces 500, so that rapid cooling is achieved without affecting other sub-modules 301.

Furthermore, the sub-module 301 includes a plurality of battery cells 3011, an end plate 3012 and an annular tie 3013. The plurality of battery cells 3011 are arranged in sequence along the length direction of the sub-module 301. The end plate 3012 is disposed at one end of the plurality of battery cells 3011 along the length direction of the sub-module 301. The annular tie 3013 surrounds the end plate 3012 and the plurality of battery cells 3011 along the circumference of the sub-module 301. Thus, the plurality of battery cells 3011 are fixed by such an arrangement, thereby improving the reliability of the sub-module 301.

In some embodiments of the present application, as shown in FIG. 1 , FIG. 2 and FIG. 14 , the liquid cooling plate 1 is disposed on the side of the submodule 301, and the through hole 111 is disposed on the surface of the plate body 11 facing the submodule 301. Thus, through such an arrangement, when the submodule 301 has thermal runaway, the coolant flows out from the opened through hole 111 and is directly sprayed onto the submodule 301, thereby increasing the speed of evaporation heat exchange, flow heat transfer, etc. between the coolant and the submodule 301, thereby achieving rapid cooling of the submodule 301, reducing the speed of heat spread, and improving the reliability of the battery pack 1000.

It should be noted that the location of the liquid cooling plate 1 is not limited thereto. According to different requirements of the battery pack 1000 , the liquid cooling plate 1 can also be located at the top or bottom of the sub-module 301 .

In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims (19)

1. A liquid cooling plate, comprising:

   A plate body, wherein the plate body has a receiving cavity for receiving a cooling liquid, and an outer surface of the plate body has a through hole connected to the receiving cavity, wherein the through holes are multiple and spaced apart;

   A hot melt component, each of the through holes is provided with the hot melt component for sealing the through hole;

   A linkage mechanism is disposed in the accommodating cavity, the linkage mechanism is connected to each of the hot melt components, and the linkage mechanism is configured to be released and drive at least part of the remaining hot melt components to at least partially open the corresponding through holes when at least one of the hot melt components is melted.
2. The liquid cooling plate according to claim 1, wherein the linkage mechanism comprises:

   A plurality of spring sheets, wherein the plurality of spring sheets correspond one to one with the plurality of through holes, and the two ends of each spring sheet in the length direction are respectively a first end and a second end, the first end is connected to the inner wall of the accommodating cavity, and the second end is connected to the corresponding hot melt component, and when the spring sheet is in a connected state with the hot melt component and all the hot melt components are located in the through hole, the second end has a tendency to move toward a direction away from the hot melt component, and the plurality of spring sheets are arranged in sequence, and after the second end of one of the spring sheets is released, it moves toward the next spring sheet and contacts with the next spring sheet to drive the next spring sheet to drive the corresponding hot melt component to open the corresponding through hole.
3. The liquid cooling plate according to claim 2, wherein the plurality of through holes are spaced apart along the circumferential direction of the plate body, and the plurality of spring sheets are spaced apart along the circumferential direction of the plate body.
4. The liquid cooling plate according to claim 2, wherein the first end of each of the spring pieces is connected to the inner circumferential wall of the accommodating cavity, and when the spring piece is connected to the hot melt component and the hot melt component is located in the through hole, the angle between the spring piece and the inner circumferential wall of the accommodating cavity is 10°-50°, and when the spring piece is in a free state, the angle between the spring piece and the inner circumferential wall of the accommodating cavity is 70°-110°.
5. The liquid cooling plate according to claim 2, wherein the linkage mechanism further comprises:

   A plurality of steel cables, wherein the second end of each of the spring pieces is connected to the hot melt component via one of the steel cables.
6. The liquid cooling plate according to claim 2, wherein the spring piece is a high carbon steel piece.
7. The liquid cooling plate according to any one of claims 1 to 6, wherein at least one surface in the thickness direction of the hot melt has an annular groove extending along the circumferential direction of the hot melt, the annular groove divides the hot melt into a moving part and a fixed part located outside the moving part, and the linkage mechanism is connected to the moving part.
8. The liquid cooling plate according to claim 7, wherein a protrusion is provided on the peripheral wall of the movable portion, a notch matching with the protrusion is provided on the inner peripheral wall of the fixed portion, and the linkage mechanism is connected to the protrusion.
9. The liquid cooling plate according to any one of claims 1-8, wherein at least part of the hot melt component has a cavity, the cavity is filled with salt powder, and the hot melt component having the cavity is opened after the through hole is opened.
10. The liquid cooling plate according to claim 9, wherein the salt powder is CuCl2 or CuSo4.
11. The liquid cooling plate according to claim 9, wherein the hot melt member having the cavity is in plurality and is evenly spaced apart along the circumferential direction of the plate body.
12. The liquid cooling plate according to claim 9, wherein a size of a through hole where the hot melt component having the cavity is located is larger than a size of a through hole where the hot melt component not having the cavity is located.
13. The liquid cooling plate according to any one of claims 1 to 12, wherein the through hole is a circular through hole.
14. The liquid cooling plate according to any one of claims 1 to 13, wherein a plurality of the through holes are provided on the same surface of the plate body.
15. The liquid cooling plate according to any one of claims 1 to 14, wherein the hot melt component is an ABS component.
16. A liquid cooling system, comprising a liquid cooling plate according to any one of claims 1-15.
17. A battery pack, comprising:

    case;

    A battery module, wherein the battery module is disposed in the housing;

    According to the liquid cooling system of claim 16, the liquid cooling plate is disposed in the shell and is attached to the battery module.
18. The battery pack according to claim 17, further comprising:

    A partition assembly is arranged in the shell to divide the space inside the shell into a plurality of spaced-apart sub-spaces. The battery module includes a plurality of sub-modules, and the plurality of sub-modules are respectively arranged in the plurality of sub-spaces. There are a plurality of liquid cooling plates, and the plurality of liquid cooling plates are respectively arranged in the plurality of sub-spaces and fit with the corresponding sub-modules.
19. The battery pack according to claim 18, wherein the liquid cooling plate is arranged on the side of the sub-module, and the through hole is arranged on the surface of the plate body facing the sub-module.