Heat dissipation device and cell heat dissipation method

Abstract

The application relates to the technical field of lithium battery manufacturing, and discloses a heat dissipation device and a cell heat dissipation method. The heat dissipation fin comprises a main body, the main body is oppositely provided with a first plane and a second plane, and a heat dissipation hole is arranged between the first plane and the second plane; the first plane and the second plane are recessed in the direction of the heat dissipation hole to form a plurality of heat dissipation grooves; the surface of the main body, the heat dissipation hole and the heat dissipation grooves forms a heat dissipation surface; and a heat radiation coating is coated on the heat dissipation surface and used for strengthening heat radiation. The application increases the heat dissipation area by arranging the plurality of heat dissipation grooves on the first plane and the second plane of the main body and the heat dissipation hole between the first plane and the second plane, and strengthens the heat radiation effect of the heat dissipation fin by coating the heat radiation coating on the heat dissipation surface, so that the heat dissipation efficiency of the heat dissipation fin is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lithium battery manufacturing, in particular to a heat dissipation device and a cell heat dissipation method. BACKGROUND

[0002] In the process of laser welding of the top cover of the cell, a large amount of heat is generated, which is usually absorbed by the upper and lower positioning blocks. However, the heat dissipation efficiency of the positioning block is limited. If the heat cannot be dissipated quickly and efficiently, the heat will be retained, causing the cell to swell, and even affecting the performance and service life of the cell.

[0003] To improve the heat dissipation efficiency of the positioning block, the number of heat dissipation fins is often increased to increase the heat dissipation area. However, due to the limitation of the internal space of the machine, too many heat dissipation fins will increase the weight and installation area of the entire positioning block, which cannot meet the installation requirements well. In addition, too much installation area will also make the internal heat dissipation space narrow, and the heat cannot be dissipated in time, which will not be conducive to the rapid cooling of the cell when the positioning block is overheated. SUMMARY

[0004] To solve the above problems existing in the prior art, the present application provides a heat dissipation device and a cell heat dissipation method, which can improve the heat dissipation performance of the heat dissipation fin and the heat dissipation device.

[0005] The present application provides the following technical solutions:

[0006] In a first aspect, the present application provides a heat dissipation fin, comprising:

[0007] a main body, oppositely provided with a first plane and a second plane, and a heat dissipation hole is arranged between the first plane and the second plane; the first plane and the second plane are recessed to form a plurality of heat dissipation grooves in the direction of the heat dissipation hole; the surface of the main body, the heat dissipation hole and the heat dissipation grooves forms a heat dissipation surface; and

[0008] a heat radiation coating coated on the heat dissipation surface for strengthening heat radiation.

[0009] In some implementations, the heat dissipation grooves of the first plane and the second plane are arranged oppositely or staggeredly.

[0010] In some implementations, the heat dissipation hole is arranged through the middle part of the main body and extends to the top and bottom parts of the main body respectively.

[0011] In some implementations, the heat radiation coating is prepared from a heat radiation paint including the following components by weight percentage: 40-60% of resin base, 20-40% of nano filler, 5-10% of curing agent, and the balance of solvent.

[0012] In some implementations, the thermal radiation coating has a layer thickness of 5-15 microns.

[0013] In a second aspect, the present application provides a heat dissipation device, comprising:

[0014] a uniform heating plate oppositely provided with a contact surface and a connecting surface, the contact surface being in contact with the battery cell, the uniform heating plate being used to conduct heat away from the battery cell; and

[0015] a plurality of heat dissipation fins arranged side by side on the connecting surface;

[0016] wherein the heat dissipation fins are as described above.

[0017] In some implementations, the uniform heating plate further comprises a heat-conducting layer coated on the contact surface.

[0018] In some implementations, the uniform heating plate further comprises a groove provided in the uniform heating plate and a cooling liquid flowing in the groove.

[0019] In some implementations, the groove is a structure formed by a plurality of groove segments continuously penetrating through, both ends of which are in communication with the outside.

[0020] The heat dissipation device further comprises a cooling liquid control system in communication with the groove, used to flexibly control the cooling liquid flowing in the groove according to the temperature of the heat dissipation device.

[0021] In a third aspect, the present application provides a battery cell heat dissipation method, comprising:

[0022] controlling the heat dissipation device to be attached to the battery cell after laser welding;

[0023] acquiring temperature data and heat data of the battery cell through a monitor in the heat dissipation device;

[0024] feeding back the temperature data and the heat data to a cooling liquid control system, and determining, by the cooling liquid control system according to a preset heat dissipation scheme, a cooling fluid type, a cooling fluid concentration and a cooling fluid flow speed selected for heat dissipation of the battery cell;

[0025] performing heat dissipation operation on the battery cell by the heat dissipation device according to the cooling fluid type, the cooling fluid concentration and the cooling fluid flow speed;

[0026] wherein the heat dissipation device is as described above.

[0027] In summary, the present application has at least the following advantages:

[0028] The heat dissipation fin, heat dissipation device and cell heat dissipation method provided by the application increase the heat dissipation area by arranging a plurality of heat dissipation grooves on the first plane and the second plane of the main body and a heat dissipation hole between the first plane and the second plane, and strengthen the heat radiation effect of the heat dissipation fin by coating a heat radiation coating on the heat dissipation surface, thereby improving the heat dissipation efficiency of the heat dissipation fin. In addition, the improved heat dissipation efficiency of the heat dissipation fin can also reduce the number of heat dissipation fins used by the heat dissipation device, ensure the internal heat dissipation space, and improve the heat dissipation effect of the heat dissipation device on the cell. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 The structure schematic diagram of the heat dissipation fin provided for the embodiment 1 of the application.

[0030] Figure 2 The structure schematic diagram of the heat dissipation device provided for the embodiment 2 of the application.

[0031] Figure 3 The structure cross-sectional schematic diagram of the heat plate provided for the embodiment 2 of the application.

[0032] Markings in the figure:

[0033] 1, heat dissipation fin, 11, main body, 111, first plane, 112, second plane, 113, heat dissipation hole, 114, heat dissipation groove; 2, heat plate, 21, contact surface, 22, connecting surface, 23, heat conduction layer, 24, groove, 241, groove section, 25, mounting hole. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the application, the application will be described more comprehensively below in combination with the drawings and specific embodiments. The preferred embodiments of the application are shown in the drawings. However, the application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the application more thorough and comprehensive.

[0035] Embodiment 1

[0036] Please refer to Figure 1 The heat dissipation fin 1 of the application includes a main body 11 and a heat radiation coating.

[0037] The main body 11 is provided with a first plane 111 and a second plane 112, and a heat dissipation hole 113 is arranged between the first plane 111 and the second plane 112; a plurality of heat dissipation grooves 114 are formed by recessing the first plane 111 and the second plane 112 in the direction of the heat dissipation hole 113; the surface of the main body 11, the heat dissipation hole 113 and the heat dissipation grooves 114 forms a heat dissipation surface.

[0038] The heat dissipation hole 113 can increase the contact area of the inside of the main body 11 with air, and the heat dissipation groove 114 can increase the contact area of the two sides of the main body 11 with air, thereby improving the air convection effect and effectively enhancing the heat exchange efficiency. On the other hand, by hollowing out part of the main body 11 through the heat dissipation hole 113 and the heat dissipation groove 114, the weight of the heat dissipation fin 1 can be reduced. Under the same heat dissipation performance requirement, the main body 11 provided with the heat dissipation hole 113 not only increases the contact area with air, improves the air convection effect, effectively enhances the heat exchange efficiency, but also effectively reduces the weight of the heat dissipation fin 1, avoids using a large number of main bodies 11, occupies a small installation area, effectively increases the heat dissipation space, and then realizes rapid cooling.

[0039] The heat radiation coating is coated on the heat dissipation surface. Specifically, the heat radiation coating is a cooling coating formed after the nano infrared heat radiation paint is cured. The heat radiation paint for preparing the heat radiation coating comprises the following components by weight percentage: 40%-60% of resin base material, 20%-40% of nano filler, 5%-10% of curing agent, and the balance of solvent, which can strengthen the heat radiation effect and thereby improve the heat dissipation.

[0040] The thickness of the heat radiation coating is 5-15 μm. The heat radiation coating designed in this thickness range can ensure the stability of the nano infrared heat radiation paint after coating, thereby ensuring stable heat dissipation performance. If the thickness is less than 5 μm, the heat dissipation capacity will be reduced, and it is more susceptible to mechanical damage and environmental factors, resulting in reduced durability. Moreover, the nano infrared heat radiation paint coating that is too thin cannot provide sufficient adhesion and is prone to falling off. If the thickness exceeds 15 μm, the thermal resistance will increase, affecting the heat conduction effect, and the thick coating may not dry uniformly, and there may be areas inside that are not fully cured, affecting the overall performance.

[0041] The preparation method of the above-mentioned nano infrared heat radiation paint is as follows: a certain amount of resin base material is added to the weighed solvent, stirred in a 60°C water bath environment, and the resin base material is gradually dissolved. Then, nano filler, curing agent, etc. are added, stirred for a period of time, the prepared paint is coated on the heat dissipation surface, and cured in a 70-80°C oven for 4-5 hours or at room temperature for 24 hours to obtain the heat radiation coating.

[0042] Specifically, the preparation components of the nano infrared heat radiation paint are as follows:

[0043] The resin base material accounts for 40%-60% of the total content, and a resin with good adhesion and high temperature resistance is selected, such as epoxy resin and silicone resin.

[0044] The solvent accounts for 10%-20% of the total content, such as n-butanol.

[0045] The nano filler accounts for 20%-40% of the total content, and a nano material with high infrared radiation performance is selected, such as one or more of nano aluminum oxide, nano zirconium oxide, nano silicon carbide, and nano titanium dioxide. Different fillers are beneficial to the vibration composite effect of infrared active bonds, thereby being beneficial to infrared radiation and thus being beneficial to cooling. Preferably, the particle size of the nano aluminum oxide ranges from 10 nm to 50 nm. The particle size of the nano zirconium oxide ranges from 20 nm to 100 nm. The particle size of the nano silicon carbide ranges from 30 nm to 500 nm. The particle size of the nano titanium dioxide ranges from 20 nm to 100 nm.

[0046] The curing agent accounts for 5%-10% of the total content.

[0047] The heat dissipation sheet 1 in the embodiment is provided with a plurality of heat dissipation grooves 114 and heat dissipation holes 113 on the main body 11 to improve the air convection efficiency, and a thermal radiation coating is coated on the heat dissipation surface to further strengthen the heat radiation effect. The combination of the structural improvement and the thermal radiation coating that strengthens the heat radiation can greatly improve the heat dissipation performance. In addition, due to the provision of the plurality of heat dissipation grooves 114 and heat dissipation holes 113, the weight of the heat dissipation sheet 1 can be reduced, and the heat dissipation sheet 1 is convenient to install and use. Under the same heat dissipation performance requirement, a large number of heat dissipation sheets 1 can be avoided, the overall structure is compact, the installation area is small, the internal heat dissipation space of the machine is effectively increased, and the function of quickly cooling the battery cell is realized.

[0048] In some embodiments, the first plane 111 and the heat dissipation grooves 114 between the second plane 112 are relatively or staggered. Through this setting, the heat dissipation area can be increased according to the specific design requirements of the heat dissipation sheet 1, and the customer's requirements can be met, and the flexibility is high.

[0049] In some embodiments, the heat dissipation holes 113 are provided in the middle of the main body 11 and extend to the top and bottom of the main body 11, respectively. Through this setting, the heat dissipation holes 113 are provided in the middle of the main body 11, which can improve the uniformity of heat dissipation and is beneficial to rapid heat dissipation. The heat dissipation holes 113 extend to the top and bottom of the main body 11, so that the size of the heat dissipation holes 113 can be designed to be large, thereby increasing the contact area with air, improving the convection rate, and improving the heat dissipation efficiency.

[0050] Embodiment 2:

[0051] Please refer to Figure 2 The heat dissipation device of the present application comprises a heat plate 2 and a plurality of heat dissipation sheets 1.

[0052] The heat plate 2 is provided with a contact surface 21 and a connecting surface 22, the contact surface 21 is in contact with the battery cell, and the heat plate 2 is used to guide out the heat of the battery cell.

[0053] A plurality of heat dissipation fins 1 are arranged side by side on the connecting surface 22; wherein the heat dissipation fin 1 is the heat dissipation fin 1 described above. The plurality of heat dissipation fins 1 are arranged at a specified interval, which can effectively increase the contact area with air and improve the heat dissipation efficiency.

[0054] In the heat dissipation device in the embodiment, the relationship between the number, height, thickness, and interval of the heat dissipation fins 1 and the overall heat dissipation performance can be estimated according to the formula of convective heat dissipation: Q = h × A × (T1-T2), wherein Q is the heat dissipation amount (W), h is the heat transfer coefficient (W / m2·K), A is the heat dissipation area (m2), T1 is the temperature of the heat source (K), T2 is the ambient temperature (K), and T1-T2 is the temperature difference between the temperature of the heat source (K) and the ambient temperature (K). The heat dissipation area A = L × (N × τ + B × (N-1)), wherein L is the length of the base of the heat dissipation fin 1 (m), N is the number of the heat dissipation fins 1, τ is the thickness of the heat dissipation fin 1 (m), and B is the interval of the heat dissipation fins 1 (m). In combination with the heat dissipation device of the present application, the heat dissipation performance of the heat dissipation fin 1 assembly with different parameter combinations, such as the number, height, thickness, and interval of the heat dissipation fins 1, can be evaluated and optimized using the formula. The optimal parameter combination can be obtained according to the results, and then the shape, size, and number of the heat dissipation fins 1 are designed to achieve the best heat dissipation performance.

[0055] In the heat dissipation device in the embodiment, the battery cell is in contact with the contact surface 21, and the heat of the battery cell is conducted from the contact surface 21 to the connecting surface 22, which can better conduct the heat to the heat dissipation fins 1, avoid the retention of heat to cause the swelling of the battery cell, and effectively ensure the quality of the battery cell. Then, the plurality of heat dissipation fins 1 increase the contact area with air, improve the air convection effect, and enhance the heat exchange efficiency, thereby quickly dissipating the heat to the air. Since the heat dissipation performance of a single heat dissipation fin 1 is good, a smaller number of heat dissipation fins 1 can be used in the present application under the condition of requiring the same heat dissipation performance, so that the overall installation area occupies less space, thereby increasing the heat dissipation space and achieving the function of rapid cooling.

[0056] In addition, the corners of the vapor chamber 2 are provided with mounting holes 25, and a conventional fastener is used to fix the pressing block at the mounting hole 25, so as to ensure the positioning of the pressing block during the laser welding of the top cover of the battery cell and ensure the welding stability.

[0057] In some embodiments, the vapor chamber 2 further comprises a heat conduction layer 23 coated on the contact surface 21. Preferably, the heat conduction layer 23 is a heat conduction layer 23 formed by heat conduction silicone grease. The heat conduction layer 23 can more effectively conduct the heat of the battery cell to the vapor chamber 2, thereby achieving the rapid dissipation of the heat of the battery cell. Specifically, the coating thickness of the heat conduction silicone grease is 0.01 mm-0.2 mm, which can ensure that the heat conduction silicone grease is uniformly coated in the small gap on the vapor chamber 2, so that the vapor chamber 2 is uniformly heated and effectively provides the heat conduction performance. If the coating thickness of the heat conduction silicone grease exceeds 0.2 mm, the thermal resistance of the vapor chamber 2 will be increased and the heat dissipation efficiency will be reduced.

[0058] The preparation method of the heat-conducting silicone grease is as follows: the base silicone oil and the auxiliary additive and the structure improving agent are put into a stirrer in proportion for preliminary mixing, to ensure that all the components are uniformly distributed, the obtained premix is put into a grinder for grinding treatment with the heat-conducting filler, the mixture after grinding is stirred and mixed again, the bubbles in the mixture are removed by a vacuum degassing machine during the mixing process, and finally the large particles and impurities not sufficiently ground are removed by a filtering device.

[0059] Specifically, the components for preparing the heat-conducting silicone grease are as follows:

[0060] The base silicone oil accounts for 30%-50% of the total content, and is usually selected as a carrier of the silicone grease, which has moderate viscosity and good chemical stability.

[0061] The heat-conducting filler accounts for 50%-70% of the total content, and can be one or more of aluminum oxide, aluminum nitride, silicon carbide and diamond powder.

[0062] The structure improving agent accounts for 5%-10% of the total content, and can be an organic silicon resin, which has both "organic groups" and "inorganic structures" in the structure, so that it has both the characteristics of organic substances and the functions of inorganic substances, and can improve the mechanical properties and viscosity of the silicone grease when the structure improving agent is the organic silicon resin.

[0063] The auxiliary additive accounts for 1%-5% of the total content, and can be one or more of antioxidants, anti-settling agents and tackifiers, which are used to improve the specific properties of the silicone grease.

[0064] The ratio of the above basic raw materials can be flexibly adjusted according to the performance of the prepared heat-conducting silicone grease, and the specific optimal ratio can be verified by adjusting the ratio of the raw materials through actual performance tests, which is not limited in the present application. The performance targets include the thermal conductivity, thermal stability, mechanical properties, and compatibility with the contact material, and the mechanical properties such as viscosity, elasticity, yield stress, etc.

[0065] The heat-conducting layer 23 in the embodiment is beneficial to the rapid conduction of the heat of the battery cell to the vapor chamber 2, effectively avoids the retention of the heat of the battery cell, and further ensures the performance and service life of the battery cell.

[0066] In some embodiments, referring to Figure 3 , the vapor chamber 2 further includes a groove 24 and a cooling liquid.

[0067] The groove 24 is arranged in the vapor chamber 2, and the groove 24 is a structure formed by a plurality of groove segments 241 continuously penetrating through, and both ends of the groove 24 are in communication with the outside. The groove segment 241 can be a U-shaped groove segment, a V-shaped groove segment or a straight-line groove segment, which can be flexibly set according to the customer's demand, and the present application does not limit it.

[0068] Preferably, the groove segment 241 adopts a U-shaped groove segment, which can form a more uniform pressure distribution in the cooling fluid, make the fluid flow more uniform, and improve the cooling efficiency; secondly, it can increase the contact area between the fluid and the solid surface, and has high structural strength; finally, it helps to guide the fluid to form a more stable laminar flow inside the groove 24, reduces the generation of turbulent flow and vortex, and reduces the fluid flow resistance.

[0069] The cooling fluid flows in the groove 24 for rapid cooling of the heat dissipation device. The heat dissipation device further comprises a cooling fluid control system in communication with the groove 24 for flexible control of the cooling fluid flowing in the groove 24 according to the temperature of the heat dissipation device. The cooling fluid is injected into and flows in the groove 24 through the external cooling fluid control system.

[0070] In the cooling fluid control system, the type, concentration, and flow rate of the cooling fluid can be automatically adjusted according to temperature changes and heat generation. The circulation of the cooling fluid can be realized by a control program to achieve closed-loop control. Specifically, the temperature of the heat plate 2 is collected, the collected data is analyzed to determine the type, concentration, and flow rate of the cooling fluid, and the corresponding cooling fluid is injected into the groove 24. At the same time, the cooling effect is monitored and fed back in real time to achieve closed-loop control.

[0071] The above data collection can be achieved by installing a temperature sensor on one side of the heat plate 2 and a thermocouple, thermistor, or other type of sensor on the other side to monitor temperature changes and heat levels.

[0072] The above cooling fluid is first transmitted to the cooling fluid control system through the monitored data, and then the cooling fluid control system sets different cooling schemes according to the preset temperature threshold and heat level to determine the type, concentration, and flow rate of the required cooling fluid, and finally controls the execution of the scheme. Specifically, the cooling fluid control system is designed as a multi-channel cooling fluid supply system, each channel is equipped with a valve, and the cooling fluid control system adjusts the opening and closing of each valve according to the cooling scheme to supply different types of cooling fluid into the groove 24 in the heat plate 2. For concentration adjustment, an injection pump can be used to accurately control the flow rate. The cooling fluid can be water, glycol solution, cold air, etc.

[0073] The above monitoring and feedback is a real-time monitoring of the adjusted cooling effect, which optimizes the type, concentration, and flow rate of the cooling fluid according to historical data to achieve the best cooling effect and realize closed-loop control.

[0074] In this embodiment, the groove 24 and the cooling fluid cooperate to achieve rapid cooling of the heat dissipation device. When the temperature is too high, the cooling fluid is injected into the groove 24, which transfers and cools the heat of the heat dissipation device, thereby achieving rapid cooling of the heat dissipation device and greatly improving the heat dissipation efficiency.

[0075] Embodiment 3:

[0076] The embodiment provides a battery cell heat dissipation method based on the above-mentioned embodiments, comprising: controlling a heat dissipation device to be attached to the battery cell after laser welding; obtaining temperature data and heat data of the battery cell through a monitor in the heat dissipation device; feeding back the temperature data and the heat data to a cooling liquid control system, and determining, by the cooling liquid control system, a cooling fluid type, a cooling fluid concentration and a cooling fluid flow speed for heat dissipation of the battery cell according to a preset heat dissipation scheme; and performing, by the heat dissipation device, heat dissipation operation on the battery cell according to the cooling fluid type, the cooling fluid concentration and the cooling fluid flow speed. The heat dissipation device can be the heat dissipation device mentioned in any of the above-mentioned embodiments, and the specific structure and arrangement mode will not be described here.

[0077] The battery cell heat dissipation method in the embodiment can conduct heat in the battery cell to the heat dissipation device through the contact between the battery cell and the heat dissipation device during laser welding of the top cover of the battery cell, thereby avoiding heat retention of the battery cell, accelerating heat dissipation of the heat of the battery cell, avoiding the phenomenon of swelling of the battery cell, and effectively ensuring the performance and service life of the battery cell.

[0078] It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or there can be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element.

[0079] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0080] In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application.

[0082] The above merely provides the illustration and description of the structure of the present application, and the description is relatively specific and detailed, but it should not be understood as the limitation on the patent scope of the present application. It should be noted that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these obvious replacement forms all belong to the protection scope of the present application.

Claims

1. A heat dissipating device, characterized by, The application relates to a heat dissipation device for a battery cell. The heat dissipation device comprises: a heat conduction plate (2) provided with a contact surface (21) and a connecting surface (22), the contact surface (21) being used for contacting the battery cell, and the heat conduction plate (2) being used for conducting heat of the battery cell; and a plurality of heat dissipation fins (1) arranged on the connecting surface (22). The heat dissipation fin (1) comprises: a main body (11) provided with a first plane (111) and a second plane (112), the first plane (111) and the second plane (112) being provided with a heat dissipation hole (113) therebetween, the first plane (111) and the second plane (112) being recessed to form a plurality of heat dissipation grooves (114) towards the heat dissipation hole (113), the surface of the main body (11), the heat dissipation hole (113) and the heat dissipation grooves (114) forming a heat dissipation surface; and a heat radiation coating coated on the heat dissipation surface and used for strengthening heat radiation. The heat dissipation hole (113) is arranged at the middle part of the main body (11) and extends to the top and bottom parts of the main body (11) respectively. The heat radiation coating is prepared from the following components in percentage by weight: 40-60% of a resin base, 20-40% of nano-filler, 5-10% of a curing agent and the rest of solvent; the resin base is selected from a resin with high temperature resistance and good bonding performance; and the nano-filler is selected from a nano material with high infrared radiation performance.

2. The heat dissipating device according to claim 1, wherein The heat dissipation grooves (114) between the first plane (111) and the second plane (112) are arranged oppositely or staggeredly.

3. The heat dissipating device of claim 1, wherein The thickness of the heat radiation coating is 5-15 mu m.

4. The heat dissipating device of claim 1, wherein The heat conduction plate (2) further comprises a heat conduction layer (23) coated on the contact surface (21).

5. The heat dissipating device of claim 1, wherein The heat conduction plate (2) further comprises a groove (24) arranged in the heat conduction plate (2) and cooling liquid flowing in the groove (24).

6. The heat dissipating device according to claim 5, wherein The groove (24) is formed by a plurality of groove segments (241) continuously penetrating and communicating with the outside at both ends. The heat dissipation device further comprises a cooling liquid control system communicating with the groove (24) and used for flexibly controlling the cooling liquid flowing in the groove (24) according to the temperature of the heat dissipation device.

7. A method of dissipating heat from a battery cell, the method comprising: The method comprises: controlling the heat dissipation device to be attached to the battery cell after laser welding; acquiring temperature data and heat data of the battery cell by a monitor in the heat dissipation device; feeding back the temperature data and the heat data to a cooling liquid control system, and determining the type, concentration and flow speed of the cooling fluid selected for the battery cell according to a preset heat dissipation scheme by the cooling liquid control system; performing heat dissipation operation on the battery cell according to the type, concentration and flow speed of the cooling fluid by the heat dissipation device; and The heat dissipation device is the heat dissipation device according to any one of claims 1-6.

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