Liquid-cooled heat dissipation plate and lithium battery module comprising same

Abstract

A liquid-cooled heat dissipation plate comprises two heat dissipation assemblies, and each heat dissipation assembly is provided with a rectangular plate body which comprises an inner surface and an opposite outer surface; u-shaped frames with proper heights are arranged on three sides of the periphery of the inner surface, and a plurality of heat dissipation columns are arranged on the inner surface; the height of the middle frame of the U-shaped frame is about two times that of the frames on the two sides, and the height of the heat dissipation columns is not higher than that of the frames on the two sides of the U-shaped frame. The liquid-cooled heat dissipation plate is formed by welding two heat dissipation assemblies after the two heat dissipation assemblies are connected with each other in the mode that the inner surfaces of the two heat dissipation assemblies are opposite to each other, the middle frame of the U-shaped frame of one heat dissipation assembly is connected to an opening of the U-shaped frame of the other heat dissipation assembly to form a liquid flow cavity, and the heat dissipation columns and the U-shaped frames are integrally formed and manufactured through a metal sheet. The at least one liquid inlet is used for allowing cooling liquid to enter the liquid flow chamber; the at least one liquid outlet is used for enabling cooling liquid to flow out of the liquid flow chamber; wherein the liquid inlet and the liquid outlet are formed in the same side or different sides of the liquid-cooled heat dissipation plate.

Description

Technical Field

[0001] The utility model relates to a liquid-cooled heat sink, in particular to a liquid-cooled heat sink that can be used for a lithium battery module. The utility model further relates to a lithium battery module comprising the liquid-cooled heat sink. Background Art

[0002] Research related to lithium batteries has improved their capabilities in voltage, energy density, charge and discharge efficiency, and cycle life, making lithium batteries occupy an extremely important strategic position in the application of daily mobile devices, electric vehicles, and even large-scale energy storage systems. With the continuous development of lithium battery materials and structures, the energy density of batteries is also constantly increasing, and the larger charge and discharge current is accompanied by a large amount of heat energy.

[0003] A lithium battery module is composed of thousands or even tens of thousands of lithium battery cells tightly arranged in a limited space, such as the space under a vehicle chassis. The rapid and large amount of heat generated by lithium batteries during the charging and discharging process can easily lead to heat accumulation due to poor heat dissipation efficiency, causing the temperature of the entire lithium battery module to rise rapidly, causing safety issues.

[0004] Due to their characteristics, lithium batteries are limited to a narrow optimal operating temperature range (approximately 15°C to 40°C). When the temperature is too low, the battery output power will be reduced. When the temperature is too high, the accelerated exothermic reaction may cause corrosion of lithium battery materials, battery degradation, and even lead to thermal runaway safety issues.

[0005] In addition to maintaining the lithium battery cells within the optimal operating range, the greater difficulty is that the overall lithium battery module or each small module that makes up the overall module must also be maintained within the optimal operating range. Currently, the thermal management systems commonly used for lithium battery modules include: air cooling, indirect liquid cooling, direct liquid cooling or immersion cooling, phase change cooling, heat pipe or heat sink cooling, and combinations of the above methods. However, in terms of commercial applications, considering factors such as cost, safety, heat dissipation capacity, weight, and configuration space, only air-cooled and liquid-cooled passive heat dissipation have been widely used in lithium battery module heat dissipation for electric vehicles, for example. However, compared with traditional air cooling technology, the thermal conductivity of liquid is at least 25 times that of air, and the heat that can be carried away by the same volume of liquid is nearly 3,000 times that of the same volume of air. Since the lithium battery cells in a lithium battery module are usually closely arranged to form a module, air cooling cannot allow air to flow efficiently between the lithium battery cells to dissipate heat. Therefore, the heat dissipation efficiency of air cooling has gradually been unable to cope with the existing closely arranged, high-energy-density lithium battery modules. Liquid cooling has a significantly better heat dissipation efficiency than air cooling due to the high heat capacity of the coolant.

[0006] The common liquid cooling heat dissipation device or system refers to indirect liquid cooling heat dissipation, which mainly uses the coolant to circulate in the heat dissipation device pipe or flow channel that is in direct contact with the lithium battery unit or lithium battery module to take away the heat generated by the lithium battery and dissipate it outside the module. Therefore, the structural design of the liquid cooling heat dissipation device not only needs to consider the effectiveness of heat dissipation between lithium battery units in the lithium battery module and the consistency of temperature, but also needs to strictly consider safety to prevent the leakage of coolant.

[0007] The lithium battery cells of common lithium battery modules include cylindrical, square and plate (or sheet) shapes. The lithium battery module is composed of cylindrical lithium battery cells. Taking Tesla electric vehicles as an example, the liquid cooling heat dissipation device used is to dissipate heat through two curved sheet-shaped liquid cooling plates. The two curved sheet-shaped liquid cooling plates are respectively provided with a liquid inlet and a liquid outlet at both ends, which are used to inject coolant for heat exchange and then take away the heat. The two curved sheet-shaped liquid cooling plates meander along the contour of the closely arranged cylindrical lithium battery cells and are in close contact with the upper and lower halves of each cylindrical lithium battery cell. The liquid cooling plate that contacts the upper half of the battery and the liquid cooling plate that contacts the lower half of the battery have opposite coolant flows in the opposite direction to reduce the temperature difference between the front and rear sections of the coolant flow path.

[0008] For modules composed of square or plate-shaped battery cells, the common liquid cooling method is to lay several liquid cooling plates on each surface of the overall module, and carry out heat exchange by flowing through the cooling liquid flow path in the liquid cooling plate to take away the heat of the module. Heat conduction plates, liquid cooling pipes, etc. can be used between each battery cell to dissipate heat to reduce the weight and cost of the overall lithium battery module. The liquid cooling plate used in this configuration must have a certain rigidity, not easy to deform or break, and must have good cooling efficiency. For example: a cooling member for a battery module disclosed in patent document CN111630708A includes: a cooling member composed of an upper plate and a lower plate, and a support member arranged between the upper plate and the lower plate. In this patent, after the upper plate and the lower plate are combined, a accommodating space is formed between them for configuring the support member. The support member is used to increase the rigidity of the cooling member as a whole, and to support the upper plate and the lower plate to avoid deformation due to external force. The support member can be made by extrusion molding to have a concave cooling liquid flow channel. Although the flow channel design of the support member can increase the rigidity of the cooling component and its heat dissipation efficiency, adding the support member also means that the overall cooling component is significantly heavier than a general two-piece liquid cooling plate, which is not conducive to the trend of lightweighting of electric vehicles. Utility Model Content

[0009] In order to solve the above-mentioned problems of rigidity, heat dissipation efficiency, overall weight, safety, etc. faced by the current liquid-cooled heat sink (or device / system) applied to lithium battery modules, the purpose of the utility model is to provide a liquid-cooled heat sink that can be used for lithium battery modules, which is directly made of a metal sheet (for example: magnesium alloy or aluminum alloy) in an integrated molding method to form a heat dissipation component, and then two heat dissipation components are connected to each other to form a liquid-cooled heat sink with a liquid flow chamber. The manufacturing method of the heat dissipation component can adopt a general traditional stamping or extrusion manufacturing method, or it can be manufactured by forging. The liquid-cooled heat sink proposed in the utility model increases the heat dissipation area and improves the heat dissipation efficiency by forming a plurality of heat dissipation columns on the inner surface of the heat dissipation component. When the two heat dissipation components are connected to form a liquid-cooled heat sink, these heat dissipation columns are distributed in the liquid flow chamber of the liquid-cooled heat sink. Therefore, when the outer surface of the liquid-cooled heat sink contacts the heat source, the heat can be quickly conducted and dispersed to these heat dissipation columns through the high thermal conductivity of the metal, and the heat can be quickly taken away by heat exchange with the cooling liquid flowing through these heat dissipation columns. Compared with the general liquid-cooled heat sink without heat dissipation columns, the liquid-cooled heat sink proposed by the utility model has a larger total heat dissipation area due to the heat dissipation columns in the liquid flow chamber, which can contact with the cooling liquid and exchange heat, so it can significantly improve the heat dissipation efficiency. At the same time, when two heat dissipation components are connected to each other to form a liquid-cooled heat sink, the heat dissipation columns from the two heat dissipation components can touch each other, which can be used as support members, so that the liquid flow chamber has many support members (heat dissipation columns) so that the liquid-cooled heat sink has a strong ability to resist external impact and will not be deformed or damaged. In addition, the liquid-cooled heat sink of the utility model can use laser melting welding to weld homogeneous materials on a small area, which can further strengthen the welding point, making it less likely to break due to external impact, resulting in cooling liquid leakage. Therefore, compared with the liquid-cooled heat sink generally used for lithium battery modules, the liquid-cooled heat sink of the utility model has higher heat dissipation efficiency and anti-deformation and damage characteristics, and also has higher safety when used for heat dissipation of lithium battery modules.

[0010] The utility model proposes a liquid-cooled heat sink that can be used for lithium battery modules. A metal sheet / block is directly made into a heat sink component with heat dissipation columns in an integrated molding method, and then two heat sink components are joined in a manner that their heat dissipation columns correspond to each other (or touch each other) to form a liquid-cooled heat sink with many heat dissipation columns distributed in the liquid flow chamber. The heat dissipation columns are distributed on the inner surfaces of both sides of the liquid flow chamber, directly immersed in the cooling liquid and heat exchange to achieve the purpose of accelerating heat dissipation. Such a heat dissipation column structural design can make the liquid-cooled heat sink of the utility model have a large heat exchange area on both sides in contact with the heat source, and can quickly conduct the heat source from both sides of the liquid-cooled heat sink to the heat dissipation columns of each heat dissipation component through heat conduction, and exchange heat with the cooling liquid to achieve rapid heat dissipation. Compared with a hollow liquid-cooled heat sink without heat dissipation columns, the liquid-cooled heat sink of the utility model has a larger total heat dissipation area, and the heat dissipation area of ​​the heat dissipation column is directly immersed in the cooling liquid, so the heat dissipation efficiency will be higher.

[0011] According to one embodiment, the utility model provides a liquid-cooled heat sink that can be used for a lithium battery module, which at least includes: two heat sink components, at least one liquid inlet and at least one liquid outlet. The heat sink component has: a rectangular plate body, including an inner surface and an opposite outer surface. Three sides of the inner surface periphery are provided with a U-shaped frame of appropriate height, and a plurality of heat dissipation columns are provided on the inner surface. The height of the middle frame of the U-shaped frame is about twice the height of the two side frames, and the height of the heat dissipation column is not higher than the two side frames of the U-shaped frame. A liquid-cooled heat sink that can be used for a lithium battery module of the utility model is formed by welding two heat sink components that are mutually joined in a manner that the inner surfaces are opposite to each other, and the middle frame of the U-shaped frame of one heat sink component is joined to the opening of the U-shaped frame of another heat sink component to form a liquid-cooled heat sink, and has a liquid flow chamber; wherein the overall structure of the heat sink component including the heat dissipation column and the U-shaped frame is made of a metal sheet in an integral molding manner. The liquid-cooled heat sink has at least one liquid inlet for connecting to an external pipeline to allow a cooling liquid to enter a liquid flow chamber; and has at least one liquid outlet for connecting to an external pipeline to allow the cooling liquid to flow out of the liquid flow chamber; wherein the liquid inlet and the liquid outlet are arranged on the same side or different sides of the liquid-cooled heat sink.

[0012] According to an embodiment of the present invention, the overall structure of the heat dissipation assembly including the heat dissipation column and the U-shaped frame is manufactured by an integral molding method using a metal sheet, and the metal sheet is a magnesium alloy or an aluminum alloy.

[0013] According to an embodiment of the present invention, the liquid-cooled heat sink is composed of two heat sink components that are joined to each other with their inner surfaces facing each other and then welded together by laser welding.

[0014] According to an embodiment of the present invention, the liquid flow chamber further includes at least one guide plate.

[0015] According to one embodiment of the utility model, the liquid-cooled heat sink is used for heat dissipation of a plate-shaped or sheet-shaped lithium battery module, and the liquid-cooled heat sink is a plate-shaped structure with a length of approximately 250mm-600mm, a width of approximately 150mm-450mm, and a thickness of approximately 10mm-30mm.

[0016] According to an embodiment of the present invention, the cooling liquid is water.

[0017] According to one embodiment, the utility model provides a lithium battery module, which includes a plurality of liquid-cooled heat sinks as described in any of the above embodiments, and a plurality of sheet-shaped or plate-shaped lithium batteries, wherein the liquid-cooled heat sinks are alternately arranged between the plurality of sheet-shaped or plate-shaped lithium batteries.

[0018] According to the lithium battery module described in an embodiment of the present invention, at least one sheet-shaped or plate-shaped lithium battery is included between two adjacent liquid-cooled heat sinks.

[0019] According to the lithium battery module described in an embodiment of the present invention, two sheet-shaped or plate-shaped lithium batteries are included between two adjacent liquid-cooled heat sinks. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The figure is a schematic structural diagram of a liquid-cooled heat sink and a heat sink assembly according to an embodiment of the present invention.

[0021] Figure 2 It is a schematic top view of the structure of the heat dissipation component in the first embodiment of the present utility model.

[0022] Figure 3 For Figure 2 A schematic top perspective structural diagram of a first embodiment of a liquid-cooled heat sink of the utility model obtained by using a heat dissipation assembly.

[0023] Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure of the first implementation form of the liquid-cooled heat sink.

[0024] Figure 5 It is a schematic top view of the structure of the heat dissipation component in the second implementation of the utility model.

[0025] Figure 6 For Figure 5 A schematic top perspective structural diagram of a second implementation of the liquid-cooled heat sink of the utility model obtained by using a heat dissipation component.

[0026] Figure 7 It is a schematic top view of the structure of the heat dissipation assembly in the third embodiment of the present utility model.

[0027] Figure 8 For Figure 7 A top perspective structural schematic diagram of a third implementation of the liquid-cooled heat sink of the utility model obtained by using a heat dissipation component.

[0028] Fig. 9 This is an embodiment of a guide plate used in a liquid-cooled heat sink of the utility model. The upper figure is a three-dimensional view, and the lower figure is a top view.

[0029] Fig.10 It is a schematic top view of the structure of the heat dissipation component in the fourth implementation of the utility model.

[0030] Fig.11 For Fig.10 A schematic top perspective structural diagram of a fourth implementation of the liquid-cooled heat sink of the utility model obtained by using a heat dissipation assembly.

[0031] Fig.12 It is a schematic diagram of a lithium battery module according to an embodiment of the utility model, which includes the liquid-cooled heat sink of the utility model.

[0032] Fig.13 It is a schematic diagram of a lithium battery module according to another embodiment of the present invention, which includes the liquid-cooled heat sink of the present invention.

[0033] Explanation of the reference numerals: 10, 20, 30, 40 - liquid-cooled heat sink; 100, 110, 120, 130, 140, 150 - heat dissipation assembly; 101 - rectangular plate; 1011 - inner surface; 1012 - outer surface; 102 - U-shaped frame; 1021 - middle frame; 1022 - two side frames; 103 - heat dissipation column; 104 - connector opening; 105 - liquid inlet; 106 - liquid outlet; 200 - connector; 300 - guide plate; 500 - sheet or plate-shaped lithium battery; S100, S200 - lithium battery module; L - liquid flow chamber. DETAILED DESCRIPTION

[0034] The following will refer to the relevant figures to illustrate an embodiment of a liquid-cooled heat sink that can be used for a lithium battery module of the present invention. For the sake of clarity and convenience of the illustration, the components in the figures may be exaggerated or reduced in size and proportion. In the following description and / or claims, the technical terms used should be interpreted in the sense known and commonly used by ordinary technicians with common knowledge in the technical field. For ease of understanding, the same elements in the following embodiments are illustrated with the same symbols. In the present utility model specification, the word "about" usually refers to the actual value within plus or minus 10%, 5%, 1% or 0.5% of a specific value or range. The word "about" in the present utility model represents that the actual value falls within the acceptable standard error of the mean value, depending on the consideration of ordinary technicians with common knowledge in the technical field to which the present utility model belongs. Except for the embodiments, or unless otherwise explicitly stated, it should be understood that the ranges, quantities, values ​​and percentages used herein are all modified by "about". Therefore, unless otherwise stated, the values ​​or parameters disclosed in the present utility model specification and the accompanying claims are approximate values ​​and can be changed as needed.

[0035] In the description of the utility model specification, the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. used to indicate the orientation or position relationship of components are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the device of the utility model and simplifying the description. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or must be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0036] See also Figures 1 to 4, which is a schematic diagram of a liquid-cooled heat sink 10 that can be used for a lithium battery module according to an embodiment of the present invention. As shown in the figure, the liquid-cooled heat sink 10 of the present invention at least includes: two heat sink components 100 with completely identical structures, which have: a rectangular plate body 101, including an inner surface 1011 and an opposite outer surface 1012; three sides of the inner surface 1011 are provided with a U-shaped frame 102 of appropriate height, and a plurality of heat dissipation columns 103 are provided on the inner surface 1011; the height of the middle frame 1021 of the U-shaped frame 102 is approximately twice the height of the two side frames 1022, and the height of the heat dissipation column 103 is not higher than the height of the two side frames 1022 of the U-shaped frame 102. In this embodiment, the liquid-cooled heat sink 10 of the utility model is formed by welding two heat sink components 100 with identical structures in a manner that the inner surfaces 1011 are opposite to each other, and the middle frame 1011 of the U-shaped frame 102 of one heat sink component 100 is connected to the opening of the U-shaped frame 102 of the other heat sink component 100 to form a liquid-cooled heat sink having a liquid flow chamber L; wherein the overall structure of the heat sink component 101 including the heat sink column 103 and the U-shaped frame 102 is made of a metal sheet (for example, magnesium alloy or aluminum alloy) in an integral molding manner. The liquid-cooled heat sink 10 of the utility model also includes at least one liquid inlet 105 for connecting an external pipeline for cooling liquid to enter the liquid flow chamber L, and at least one liquid outlet 106 for connecting an external pipeline for cooling liquid to flow out of the liquid flow chamber L, wherein the liquid inlet 105 and the liquid outlet 106 can be respectively arranged on the same side or different sides of the liquid-cooled heat sink 10. When the cooling liquid enters the liquid flow chamber L, it will flow through the plurality of heat dissipation columns 103 distributed in the liquid flow chamber L and perform heat exchange. Then, the temperature of the cooling liquid after absorbing the heat source will rise and flow out from the liquid outlet 106. Through the external pipeline connected to the liquid outlet 106, the cooling liquid after absorbing the heat source is transported to the heat dissipation device to dissipate the heat and reduce the temperature of the cooling liquid. Then, the cooled cooling liquid is transported again through another external pipeline and injected into the liquid flow chamber L through the liquid inlet 105, so as to circulate and achieve the heat dissipation effect of the liquid-cooled heat sink.

[0037] For further explanation, please refer to Figures 1 to 3In this embodiment, the liquid inlet 105 and the liquid outlet 106 can be formed by pre-arranging at least one joint opening 104 in the middle frame 1011 of the U-shaped frame 102 when manufacturing the heat dissipation component 100, and then two heat dissipation components 100 with the same structure are joined to form a liquid-cooled heat sink 10. The joint opening 104 serves as the liquid inlet 105 and the liquid outlet 106 of the liquid-cooled heat sink 10, and can be connected to an external pipeline through a joint 200. The liquid-cooled heat sink 10 in this embodiment is formed by joining two heat dissipation components 100 with the same structure. The number of the joint opening 104 of the heat dissipation component 100 is one, and its position is located in the middle position of the middle frame 1021. Therefore, when the two heat dissipation components 100 are connected to each other to form a liquid-cooled heat sink 10, one joint opening 104 of one heat dissipation component 100 is used as a liquid inlet 105, and one joint opening 104 of the other heat dissipation component 100 is used as a liquid outlet 106. The liquid inlet 105 and the liquid outlet 106 are located on opposite sides (i.e., different sides) of the liquid-cooled heat sink 10.

[0038] See also Figure 5 and Figure 6 In the second embodiment of the present invention, the liquid cooling heat sink 20 has a plurality of liquid inlets 105 and a plurality of liquid outlets 106, and the plurality of liquid inlets 105 are located on opposite sides of the plurality of liquid outlets 106. For further description, please refer to Figure 5In the second embodiment of the present invention, the liquid-cooled heat sink 20 is formed by joining two heat sink components 110 of the same structure, and the middle frame 1021 of the U-shaped frame 102 of the heat sink component 110 has a plurality of joint openings 104. The number of the joint openings 104 described in this embodiment is 4, but not limited to this, and they are evenly arranged in the middle frame 1021. Therefore, when the two heat sink components 110 are joined together to form the liquid-cooled heat sink 20, the four joint openings 104 from one heat sink component 110 can be used as four liquid inlets 105, which are used to further connect four external pipelines through the joint 200, and inject cooling liquid into the liquid flow chamber L through these four external pipelines to the liquid-cooled heat sink 20. The four joint openings 104 of the other heat dissipation component 110 serve as four liquid outlets 106, which are used to further connect four external pipelines through the joints 200, so that the cooling liquid flowing through the liquid flow chamber L can flow out to the external pipelines through the four liquid outlets 106 and perform heat dissipation and circulation. In the liquid-cooled heat sink 20 of the present embodiment, the four liquid inlets 105 are located on opposite sides of the four liquid outlets 106. It should be understood that the liquid-cooled heat sink 20 provided in the present embodiment has four liquid inlets 105 and four liquid outlets 106. Therefore, compared with the liquid-cooled heat sink 10 having only one liquid inlet 105 and one liquid outlet 106, the volume of cooling liquid injected into and flowing out of the liquid flow chamber L per unit time is larger, and the efficiency of liquid cooling and heat dissipation will be relatively improved.

[0039] See also Figures 7 to 9 In the third embodiment of the present invention, the liquid-cooled heat sink 30 has a plurality of liquid inlets 105 and a plurality of liquid outlets 106, and these plurality of liquid inlets 105 are located on the same side of these plurality of liquid outlets 106. At the same time, a long sheet-shaped guide plate 300 is further provided in the liquid flow chamber L of the liquid-cooled heat sink 30, disposed in the liquid flow chamber L, between these plurality of liquid inlets 105 and these plurality of liquid outlets 106, so as to guide the cooling liquid injected from the liquid inlet 105 to a farther distance, and avoid the cooling liquid just injected into the liquid flow chamber L from being directly discharged from the liquid outlet 106 and affecting the heat dissipation efficiency. It should be understood that the form and quantity of the guide plate 300 can be designed according to actual application requirements. For example, the number of the guide plates 300 can be 1, 2, 3, 4, 5 or 6. For further explanation, please refer to Figure 7In the third embodiment of the present invention, the liquid-cooled heat sink 30 is formed by joining a heat sink component 120 and another heat sink component 130. Among them, the middle frame 1021 of the U-shaped frame 102 of the heat sink component 120 does not have a joint opening 104; on the contrary, a plurality of joint openings 104 are provided on the middle frame 1021 of the U-shaped frame 102 of the heat sink component 130. In this embodiment, the number of joint openings 104 is 6, which are evenly distributed on the middle frame 1021. When the heat sink component 120 and the heat sink component 130 are joined to each other to form the liquid-cooled heat sink 30, three of the six joint openings 104 located on one side can be used as liquid inlets 105, and the other three located on the other side can be used as liquid outlets 106. At the same time, a long sheet-shaped guide plate 300 is further provided between the three liquid inlets 105 and the three liquid outlets, such as Figure 7 As shown in FIG. 1 , the guide plate 300 can guide the flow direction of the cooling liquid flowing into the liquid flow chamber L from the three liquid inlets 105, so that the cooling liquid does not form turbulence in the liquid flow chamber L, but can flow out smoothly from the three liquid outlets 106. In this embodiment, the guide plate 300 is in the shape of an O-shaped long strip, such as Fig. 9 As shown, it can be fixed in the liquid flow chamber L by covering a plurality of heat dissipation columns 103 in the liquid flow chamber L.

[0040] See also Fig.10 and Fig.11 In the fourth embodiment of the present invention, the liquid-cooled heat sink 40 has a plurality of liquid inlets 105 and a plurality of liquid outlets 106, and the plurality of liquid inlets 105 are located on the opposite side of the plurality of liquid outlets 106, and are approximately located at the diagonal positions of the liquid-cooled heat sink 40. In the liquid flow chamber L of the liquid-cooled heat sink 40 of this embodiment, a plurality of long strip-shaped guide plates 300 are further provided in the liquid flow chamber L, between the plurality of liquid inlets 105 and the plurality of liquid outlets 106. For further description, please refer to Fig.10 In the fourth embodiment of the present invention, the liquid-cooled heat sink 40 is formed by joining a heat sink component 140 and another heat sink component 150. The difference between the heat sink component 140 and the heat sink component 150 is that the joint openings 104 of the two are respectively located on the left and right halves of the middle frame 1021 of the U-shaped frame 102. Therefore, when the heat sink component 140 and the heat sink component 150 are joined to form the liquid-cooled heat sink 40, the joint openings 104 of the two will be approximately located at diagonal positions on opposite sides of the liquid-cooled heat sink 40, such as Fig.11 In this embodiment, two guide plates 300 are further provided in the liquid flow chamber L to guide the flow direction of the cooling liquid flowing into the liquid flow chamber L and increase the flow path, so as to increase the residence time of the cooling liquid in the liquid flow chamber L and thereby improve the heat dissipation efficiency.

[0041] It should be understood that the positions and numbers of the joint openings 104 and the guide plates 300 in the above-mentioned embodiments can be adjusted according to the actual application conditions, and each implementation is only used as an exemplary description of the content of the utility model, and should not be regarded as a limitation on the liquid-cooled heat sink claimed by the utility model. For example: the liquid inlet 105 and the liquid outlet 106 can be arranged on the same side or different sides of the liquid-cooled heat sink, and the number of the liquid inlet 105 and the liquid outlet 106 can be 1, 2, 3 or 4 respectively, and each liquid inlet 105 and the liquid outlet 106 can be arranged on the same side, part of the same side or different sides. In addition, in addition to being pre-set on the middle frame 1021 of the heat dissipation component (such as heat dissipation components 100, 110, 130, 140, 150) as shown in the above-mentioned embodiments, two heat dissipation components (such as heat dissipation component 120) that are not pre-set with the joint opening 104 can also be first connected to form a liquid-cooled heat sink, and then the opening is made according to actual application requirements.

[0042] In any of the above embodiments, the liquid-cooled heat sink (liquid-cooled heat sink 10, 20, 30, 40) of the present invention, wherein the overall structure of the heat sink assembly (such as heat sink assembly 100, 110, 120, 130, 140, 150) includes the heat sink 103 and the U-shaped frame is made of a metal sheet / block in an integrated manner, and the metal sheet / block is a magnesium alloy or an aluminum alloy.

[0043] In any of the above embodiments, the liquid-cooled heat sink of the present invention is formed by laser welding after two heat sink components are joined to each other in a manner that their inner surfaces 1011 are opposite to each other. It should be understood that laser welding is a process of focusing a laser beam to quickly weld two homogeneous or heterogeneous objects to be joined. The high-energy laser is focused on a small area between the two objects to quickly weld the two objects to be joined, which can reduce the thermal impact of the joined objects. Therefore, in order to avoid the use of traditional welding, which may affect the physical properties of the heat conductivity and thermal diffusion coefficient of the heat sink component material due to the large high-temperature area of ​​welding, laser welding is selected to weld the heat sink components. In addition, laser welding is different from general brazing. It can weld homogeneous objects without the need to use other heterogeneous solders, and can maintain physical properties such as rigidity, thermal conductivity and thermal diffusion coefficient. These characteristics can make the liquid-cooled heat sink of the present invention significantly superior to other similar products when used for heat dissipation of lithium battery modules. For example, the strong rigidity and homogeneous welding can make the liquid-cooled heat sink of the present invention less likely to deform or break at the weld when subjected to external impact when used for heat dissipation of lithium battery modules, thus having higher safety.

[0044] In one embodiment, the liquid-cooled heat sink of the present invention (liquid-cooled heat sink 10, 20, 30, 40, hereinafter only 10 is used as an example) is used for heat dissipation of a plate-shaped or sheet-shaped lithium battery module. Therefore, in order to match the size design of the lithium battery module and maintain effective heat dissipation, the liquid-cooled heat sink 10 of the present invention is a plate-shaped structure with a length of approximately 250mm-600mm, a width of approximately 150mm-450mm, and a thickness of approximately 10mm-30mm, so as to facilitate configuration between the plate-shaped or sheet-shaped lithium batteries 500.

[0045] In one embodiment, the liquid-cooled heat sink (liquid-cooled heat sink 10, 20, 30, 40) of the present invention uses water as the cooling liquid, especially softened water, to avoid scale formation after long-term use. In other embodiments, the cooling liquid may also be added with an antifreeze agent (e.g., ethylene glycol) depending on the actual application situation to prevent the cooling liquid from solidifying and becoming ineffective when the ambient temperature is below zero degrees Celsius.

[0046] See also Fig.12 and Fig.13 , which is a schematic diagram of a lithium battery module (S100, S200) of an embodiment of the present invention, which includes a liquid-cooled heat sink of any of the above embodiments of the present invention (the figure uses the liquid-cooled heat sink 10 as an example). In one embodiment, a lithium battery pack (S100, S200) of the present invention includes a plurality of liquid-cooled heat sinks 10 of any of the above embodiments, and a plurality of sheet-shaped or plate-shaped lithium batteries 500, wherein the liquid-cooled heat sinks 10 are alternately arranged between the plurality of sheet-shaped or plate-shaped lithium batteries 500. In any embodiment, in the above lithium battery module (S100, S200), at least one sheet-shaped or plate-shaped lithium battery 500 is included between two adjacent liquid-cooled heat sinks 10.

[0047] In one embodiment, in a lithium battery module (S200) described in the present invention, two sheet-shaped or plate-shaped lithium batteries 500 are included between two adjacent liquid-cooled heat sinks 10. As mentioned above, since the liquid flow chamber L of the liquid-cooled heat sink (liquid-cooled heat sink 10, 20, 30, 40) of the present invention has many heat dissipation columns 103, compared with other liquid-cooled heat sinks, it has a significantly larger heat dissipation area and can more efficiently exchange heat with the cooling liquid. At the same time, a plurality of liquid inlets 105 and a plurality of liquid outlets 106 can be designed according to the actual application situation to increase the flow rate of the cooling liquid to achieve a faster heat dissipation effect. Therefore, even if two sheet-shaped or plate-shaped lithium batteries are included between two adjacent liquid-cooled heat sinks 10, the temperature of the lithium battery module S200 can be maintained at the operating temperature, and the overall lithium battery module S200 has a lighter total weight.

[0048] Of course, the above embodiments are only used for illustration and not to limit the scope of the present invention. Any equivalent modifications or changes made to a liquid-cooled heat sink or a lithium battery module including the liquid-cooled heat sink according to the above embodiments should still be included in the scope of the claims of the present invention.

[0049] It is worth mentioning that the liquid-cooled heat sink for lithium battery modules of the present invention uses a metal sheet to form a heat sink component in an integrated manner, which not only greatly increases the total heat dissipation area of ​​the liquid-cooled heat sink, improves the thermal conductivity and heat diffusion efficiency, but also makes it have higher rigidity and deformation resistance. It is superior to general liquid-cooled heat sinks in terms of heat dissipation efficiency, durability, and reliability. Overall, the liquid-cooled heat sink for lithium battery modules of the present invention has the following advantages:

[0050] 1. The liquid-cooled heat sink has many heat dissipation columns inside, and the structure is relatively rigid, so a thinner liquid-cooled heat sink can be made, which is not easy to break and has higher safety.

[0051] 2. It has a significantly larger heat dissipation and heat exchange area, and better heat dissipation efficiency.

[0052] 3. Laser welding is used for homogeneous welding. The strength of the weld is stronger than that of general low-temperature brazing, it is not easy to crack, and the safety is better than brazing.

[0053] 4. Not only is the heat dissipation area much larger than that of a general liquid-cooled heat sink with flow channels, but also the presence and distribution of the heat dissipation columns can increase the disturbance and mixing of the cooling liquid, making the temperature distribution of the cooling liquid more uniform than that of a liquid-cooled heat sink with flow channels, and the temperature difference of the overall heat dissipation device is smaller.

[0054] It can be seen that the present invention has indeed achieved the desired improved effect by breaking through the existing technology, and it is not easy for those familiar with the art to think of it.

[0055] The above description is for illustrative purposes only and is not intended to be limiting. Any other equivalent modifications or changes made to the present invention without departing from the spirit and scope of the present invention should be included in the scope of the appended claims.

Claims

1. A liquid-cooled heat sink, characterized in that: include: Two heat dissipation components, the heat dissipation components having: A rectangular plate body, including an inner surface and an opposite outer surface; three sides of the inner surface are provided with a U-shaped frame of appropriate height, and a plurality of heat dissipation columns are provided on the inner surface; the middle frame height of the U-shaped frame is twice the height of the two side frames, and the height of the heat dissipation column is not higher than the two side frames of the U-shaped frame; the liquid-cooled heat sink is formed by welding two heat dissipation components, which are mutually joined in a manner that the inner surfaces are opposite, and the middle frame of the U-shaped frame of one heat dissipation component is joined to the opening of the U-shaped frame of the other heat dissipation component to form the liquid-cooled heat sink with a liquid flow chamber; wherein the overall structure of the heat dissipation component including the heat dissipation column and the U-shaped frame is made of a metal sheet in one piece; at least one liquid inlet for connecting to an external pipeline to allow a cooling liquid to enter the liquid flow chamber; and At least one liquid outlet for connecting to an external pipeline to allow the cooling liquid to flow out of the liquid flow chamber; The liquid inlet and the liquid outlet are arranged on the same side or different sides of the liquid-cooled heat sink.

2. The liquid-cooled heat sink according to claim 1, wherein: The overall structure of the heat dissipation component including the heat dissipation column and the U-shaped frame is manufactured by an integral molding method using a metal sheet / block, and the metal sheet / block is a magnesium alloy or an aluminum alloy.

3. The liquid-cooled heat sink according to claim 1, wherein: The liquid-cooled heat sink is formed by welding two heat sink components together in a laser welding manner after the inner surfaces thereof are mutually joined.

4. The liquid-cooled heat sink according to claim 1, wherein: The liquid flow chamber also includes at least one guide plate.

5. The liquid-cooled heat sink according to claim 1, wherein: It is used for heat dissipation of a plate-shaped or sheet-shaped lithium battery module, and the liquid-cooled heat sink is a plate-shaped structure with a length of about 250mm-600mm, a width of about 150mm-450mm, and a thickness of about 10mm-30mm.

6. The liquid-cooled heat sink according to claim 1, wherein: The cooling liquid is water.

7. A lithium battery module, characterized in that: The invention comprises a plurality of liquid-cooled heat sinks as claimed in claim 1 and a plurality of sheet-shaped or plate-shaped lithium batteries, wherein the liquid-cooled heat sinks are alternately arranged between the plurality of sheet-shaped or plate-shaped lithium batteries.

8. The lithium battery module according to claim 7, characterized in that: At least one sheet-shaped or plate-shaped lithium battery is included between two adjacent liquid-cooled heat sinks.

9. The lithium battery module according to claim 7, characterized in that: Two adjacent liquid-cooled heat sinks contain two sheet-shaped or plate-shaped lithium batteries.

Images