Liquid cooling assembly, battery pack and electric equipment

Abstract

The invention discloses a liquid cooling assembly, a battery pack and electric equipment, and relates to the technical field of batteries, the liquid cooling assembly comprises a first liquid cooling plate, at least one first closed cavity and a phase change filling piece, the first liquid cooling plate is internally provided with a first liquid cooling flow channel; at least one first closed cavity is arranged in the first liquid cooling plate, the first closed cavity and the first liquid cooling flow channel are arranged in different areas of the first liquid cooling plate, and the first closed cavity and the first liquid cooling flow channel are independently arranged; the first closed cavity is filled with the phase change filling piece, and at least part of the first closed cavity is filled with the phase change filling piece. According to the battery pack, efficient utilization of energy can be realized in the working process of the battery, so that the energy consumption is reduced, and the service life of the corresponding battery pack is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid cooling assembly, a battery pack and an electrical device. Background Art

[0002] Thermal management of battery packs can be achieved through air cooling, heat pipe cooling, phase change material cooling, immersion cooling, and liquid cooling plate contact heat exchange cooling. The mainstream cooling method is liquid cooling plate contact heat exchange, which is efficient and easy to implement. In order to achieve better heat exchange effect, three-series aluminum or six-series aluminum is usually used as the main material of the liquid cooling plate, but the high thermal conductivity of aluminum also leads to poor insulation effect of the battery pack in low temperature environment.

[0003] The heat of the battery cell is transferred to the box through the liquid cooling plate and carried away by the air. Because the liquid cooling plate is fixed to the edge of the box, the temperature of the liquid cooling plate at the edge is lower. In addition, the heat dissipation of the battery cells around the module cells is faster (heat exchange of air in the package), resulting in a greater temperature difference between modules. The large temperature difference of the battery cells affects the recyclability of the battery cells and ultimately reduces the life of the entire package. Summary of the invention

[0004] The present application provides a liquid cooling assembly, a battery pack and an electrical device, which can enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0005] In a first aspect, the present application provides a liquid cooling assembly, which includes a first liquid cooling plate, at least one first closed cavity and a phase change filler.

[0006] A first liquid-cooling channel is arranged in the first liquid-cooling plate; at least one first closed cavity is arranged in the first liquid-cooling plate, the first closed cavity and the first liquid-cooling channel are arranged in different areas of the first liquid-cooling plate, and the first closed cavity and the first liquid-cooling channel are arranged independently of each other; a phase change filler is filled in the first closed cavity, and at least part of the first closed cavity is filled with the phase change filler.

[0007] The function of the above-mentioned liquid cooling component is to provide heat dissipation for components such as battery cells that need heat dissipation. The following is an exemplary explanation using the battery cell as an example. The liquid cooling component mainly includes a first liquid cooling plate and at least one first closed cavity. The first liquid cooling plate is installed on one side of the battery cell, and a first liquid cooling channel is arranged inside the first liquid cooling plate. The first liquid cooling channel is used to circulate coolant to take away the heat generated by the battery cell. The first closed cavity and the first liquid cooling channel are arranged in different areas of the first liquid cooling plate. It can also be said that the first closed cavity is arranged in an area where the flow channel is not arranged on the first liquid cooling plate, or the first closed cavity is arranged on the side of the first liquid cooling channel away from the battery cell. The first closed cavity is used to fill the phase change filler. Through the characteristics of the phase change filler, the battery can achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack. The phase change filler can be filled in the first closed cavity, and each first closed cavity is filled with a phase change filler, which can further improve the energy utilization rate.

[0008] Specifically, the phase change filler is a filling structure of a special material, which is specifically filled in the first closed cavity, and each first closed cavity is filled with a phase change filler. This phase change filler plays an important role in the operation of the battery. When the battery causes the temperature to rise to the melting point of the phase change material under severe working conditions, for example, when the temperature reaches 30°C, the phase change material begins to melt and absorbs a large amount of heat through its phase change process, thereby delaying the further increase in the battery temperature; or, when the battery causes the temperature to drop under cold working conditions, for example, when the battery is parked outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the solidification point of the phase change filler, the material solidifies and releases heat through latent heat, delaying the temperature drop of the liquid cooling plate and the battery cell. The above characteristics enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0009] In some examples, in the thickness direction of the first liquid cooling plate, the first liquid cooling plate has a first side surface and a second side surface, the first side surface is a plane, and the second side surface is an uneven surface;

[0010] The first side surface is used for installing the battery cell; the first closed cavity is opened in the area of ​​the first liquid cooling plate where no flow channel is set, and the area of ​​the first liquid cooling plate where no flow channel is set includes at least one of the end portion and the groove area of ​​the second side surface.

[0011] In the above structure, the first liquid cooling plate has a first side surface and a second side surface in the thickness direction of the first liquid cooling plate. The first side surface is designed to be a flat plane, which can be conveniently used to install the battery cell, and can provide the connection stability between the first side surface and the battery cell, thereby ensuring the stability and reliability of the battery pack. In addition, after the first side surface is set as a flat surface, the contact area between the first side surface and the battery cell can be increased, ensuring that the heat on the battery cell can be transferred from the first side surface to the first liquid cooling plate faster and more effectively.

[0012] The second side surface presents an uneven surface structure. As can be seen from the above, the second side surface is the surface away from the battery cell. By setting the second side surface as an uneven surface, the heat dissipation efficiency of the first liquid cooling plate can be improved, and the heat generated by the battery cell can be quickly transferred from the first side surface to the second side surface, thereby ensuring that the battery cell can always maintain the operating temperature.

[0013] The above-mentioned design opens at least one first closed cavity on the first liquid cooling plate. The closed cavity is arranged in an area of ​​the first liquid cooling plate where no flow channel is arranged. Specifically, the area where no flow channel is arranged includes at least one of the end and the groove area of ​​the second side. Such a design ensures that the first closed cavity will not conflict with the cooling flow channel in the liquid cooling plate, thereby ensuring the smooth operation of the cooling system.

[0014] The first closed cavity can be used to fill the phase change filler. The phase change filler is a special material that can absorb and release heat through its phase change characteristics during the operation of the battery. This characteristic enables the battery to achieve efficient energy utilization during operation, thereby significantly reducing energy consumption. In this way, the service life of the corresponding battery pack can be effectively improved, ensuring that the battery maintains good performance during long-term operation.

[0015] In order to further improve the utilization of energy, each first closed cavity can be filled with a phase change filler. This comprehensive filling strategy ensures that each closed cavity can fully play its role, thereby achieving the best thermal management effect in the entire battery system. In this way, the battery pack can maintain a stable temperature under various operating conditions, thereby ensuring the efficient operation of the battery and extending its service life.

[0016] In some examples, the first liquid cooling plate has a first side surface and a second side surface in a thickness direction of the first liquid cooling plate;

[0017] The first liquid cooling plate is provided with two layers in the thickness direction. A first liquid cooling channel is provided in a layer of the first liquid cooling plate close to the first side surface, and a first closed cavity is provided in a layer of the first liquid cooling plate close to the second side surface.

[0018] The above structure can further optimize the cooling effect. Specifically, the first liquid cooling plate can be provided with a two-layer structure in the thickness direction. A first liquid cooling channel is provided in a layer of the first liquid cooling plate close to the first side surface. The first side surface can be connected to or abut the battery cell to increase the contact area between the first side surface and the battery cell, thereby ensuring that the heat on the battery cell can be transferred from the first side surface to the first liquid cooling plate faster and more effectively.

[0019] A first closed cavity is provided in a layer of the first liquid cooling plate close to the second side surface, and the first closed cavity can be used to fill a phase change filler. The phase change filler is a special material that can absorb and release heat through its phase change characteristics during the operation of the battery. This characteristic enables the battery to achieve efficient energy utilization during operation, thereby significantly reducing energy consumption. In this way, the service life of the corresponding battery pack can be effectively improved, ensuring that the battery maintains good performance during long-term operation. This double-layer structure design not only ensures the smoothness of the cooling flow channel, but also ensures the independence of the closed cavity and the effective use of the phase change filler. The above-mentioned double-layer structure can be a profile plate with upper and lower planes.

[0020] Based on the above embodiments, when designing and constructing a battery pack, the first side has the ability to be directly or indirectly connected to the battery cell. When a direct connection method is adopted, the first side will be in direct and close contact with the surface of the battery cell to form a direct heat conduction path. This direct contact method can ensure that heat is quickly transferred from the battery cell to the first side, thereby effectively performing thermal management.

[0021] When an indirect connection is used, the first side surface is connected to the surface of the battery cell through a heat-conducting layer. This heat-conducting layer can be made of a variety of materials, such as thermally conductive glue or a flexible thermally conductive pad. These heat-conducting layer materials have good thermal conductivity and can effectively transfer the heat generated by the battery cell to the first side surface. In this way, even if there is a certain gap or incomplete contact between the battery cell and the first side surface, effective heat transfer can be guaranteed.

[0022] The thermal conductive adhesive can be a viscous thermal conductive material with good bonding and thermal conductivity, and can form a stable thermal conductive channel between the battery cell and the first side. The flexible thermal conductive pad is an elastic thermal conductive material that can provide a certain buffering effect between the battery cell and the first side while maintaining a good thermal conductive effect. The selection and application of these two thermal conductive layer materials can be optimized and adjusted according to the specific battery design and thermal management requirements.

[0023] In some examples, the liquid cooling assembly further includes a second liquid cooling plate, which is disposed on a side of the first liquid cooling plate close to the battery cell;

[0024] In the thickness direction of the second liquid cooling plate, the second liquid cooling plate has a third side surface and a fourth side surface, the third side surface is a plane, and the fourth side surface is an uneven surface;

[0025] A second closed cavity is provided on the area of ​​the second liquid cooling plate where no flow channel is provided, and at least a portion of the second closed cavity is filled with a phase change filler. The area of ​​the second liquid cooling plate where no flow channel is provided includes at least one of the groove areas of the end and the second side.

[0026] The second liquid cooling plate is arranged on the side of the first liquid cooling plate close to the battery cell. The second liquid cooling plate can be called a side liquid cooling plate, and side liquid cooling plates can be arranged on both sides of the battery cell. In the thickness direction of the second liquid cooling plate, the second liquid cooling plate has a third side and a fourth side. Among them, the second liquid cooling plate between the two battery cells can be used as a shared liquid cooling plate, and the third side and the fourth side are both set to a flat plane; the second liquid cooling plate that is set on one side of the battery cell and is not shared can also present an uneven surface feature on the fourth side away from the battery cell as needed. Such a design enables the second liquid cooling plate to better contact the battery cell, thereby improving the cooling effect.

[0027] A second closed cavity is arranged on the second liquid cooling plate. These second closed cavities are also arranged in the area of ​​the second liquid cooling plate where no flow channel is arranged, ensuring the smoothness of the flow channel and the independence of the closed cavity. Specifically, the area where no flow channel is arranged on the second liquid cooling plate includes at least one of the groove areas of the end and the fourth side. Such a design enables the second closed cavity to be effectively filled with the phase change filler, thereby utilizing the characteristics of the phase change filler to achieve efficient energy utilization during the operation of the battery. In this way, energy consumption can be significantly reduced and the service life of the corresponding battery pack can be improved.

[0028] The phase change filler can also be filled in the second closed cavity, and each second closed cavity is filled with a phase change filler. This comprehensive filling method can further improve the energy utilization rate and ensure the stability and efficiency of the battery pack during long-term operation.

[0029] In some examples, the phase change filler is at least one of a liquid phase change material, a gas phase change material, or a solid phase change material.

[0030] Phase change fillers usually use one or more of liquid, gas or solid phase change materials. In order to ensure that the volume change during the phase change process is not too large, thereby affecting the stability and performance of the equipment, the choice of phase change materials tends to use solid phase change materials. These solid phase change materials can be further subdivided into organic phase change materials, inorganic phase change materials or eutectic phase change materials. Among these options, hydrated salt materials with a large degree of supercooling can be further used, because the freezing point of such materials can be within a relatively low temperature range, and their melting point is set at room temperature or a suitable operating temperature range for the battery, such as 25°C to 45°C.

[0031] In some examples, the phase change filler is a solid phase change material, and the solid phase change material includes one or a mixture of two or more of an organic phase change material, an inorganic phase change material, or a eutectic phase change material.

[0032] The phase change filler can be further composed of solid phase change materials, which can be organic phase change materials, inorganic phase change materials, or eutectic phase change materials, which can be used alone or as a mixture of two or more materials. When designing these solid phase change materials, their physical and chemical properties are specially considered to ensure that they can effectively change phases within a specific temperature range, thereby realizing the storage and release of thermal energy.

[0033] In some examples, the phase change filler is a hydrated salt material having a supercooling degree within a preset range.

[0034] Among these materials, hydrated salt materials with a large degree of supercooling are preferred because the freezing point of such materials can be within a relatively low temperature range, while their melting point can be set at room temperature or within a suitable operating temperature range for the battery, such as 25°C to 45°C. Such a design has obvious advantages, especially when parking outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the freezing point of the phase change filler, the material solidifies and releases heat by releasing latent heat, which can effectively delay the temperature drop of the liquid cooling plate and the battery cell.

[0035] In some examples, at least one first closed cavity is disposed on an outer edge of the first liquid cooling plate where no flow channel is disposed by at least one of stamping, blowing, and extrusion.

[0036] At least one first closed cavity is arranged on the outer edge of the first liquid cooling plate where no flow channel is arranged by at least one of stamping, blowing, and extrusion. This arrangement can ensure that the first closed cavity will not cause any interference with the first liquid cooling flow channel in the first liquid cooling plate, thereby avoiding potential structural problems. At the same time, the setting of the first closed cavity can also perform temperature compensation for the uncovered area of ​​the first liquid cooling flow channel, ensuring that the temperature distribution of the entire liquid cooling plate is more uniform and improving the cooling efficiency. After the first closed cavity is filled with the phase change filler, the characteristics of the phase change filler can enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0037] In some examples, the first liquid cooling plate is a first liquid cooling plate, a first liquid cooling channel is arranged in a layer of cavity near the battery cell in the first liquid cooling plate, and a cavity on one side of the first liquid cooling plate away from the battery cell is a first closed cavity.

[0038] Alternatively, the first liquid cooling plate is a structure of at least two layers, including a flow channel layer and a phase change layer. The flow channel layer is arranged close to the battery cell, and the flow channel layer is provided with a first liquid cooling flow channel. The phase change layer is arranged on the side of the flow channel layer away from the battery cell, and a first closed cavity filled with a phase change filler is provided in the phase change layer. The flow channel layer is fixedly connected to the phase change layer.

[0039] The first liquid cooling plate can adopt the design of the first liquid cooling plate. In this design, the first liquid cooling plate includes two parts, and the first liquid cooling channel is specially designed inside the cavity layer close to the battery cell. The function of these channels is to effectively absorb and conduct the heat generated by the battery cell during operation through the circulating coolant, thereby achieving the cooling effect. On the other side of the first liquid cooling plate, that is, the cavity layer away from the battery cell, it is designed as a closed cavity, which can play a certain role in heat insulation and also provides a stable structural support for the liquid cooling system.

[0040] Alternatively, the first liquid cooling plate can also adopt a design with at least two layers of structure, which includes a flow channel layer and a phase change layer. The flow channel layer is the layer directly close to the battery cell, and the first liquid cooling flow channel is arranged on the flow channel layer. These flow channels are also used for the circulation of the coolant to achieve cooling of the battery cell. The phase change layer is located on the side of the flow channel layer away from the battery cell. A closed cavity filled with phase change material is arranged inside the phase change layer. These phase change materials will undergo phase change after absorbing heat, thereby absorbing more heat and further improving the cooling efficiency.

[0041] In some examples, the liquid cooling assembly also includes a second liquid cooling plate, the first liquid cooling plate is a bottom liquid cooling plate, the second liquid cooling plate is a side liquid cooling plate, a second closed cavity is provided in an area of ​​the second liquid cooling plate where no flow channel is provided, and the second closed cavity is filled with a phase change filler.

[0042] The design of the liquid cooling assembly includes two main parts, namely the first liquid cooling plate and the second liquid cooling plate. Among them, the first liquid cooling plate is usually designed as a bottom liquid cooling plate. The first liquid cooling plate is located at the bottom of the battery pack and is mainly responsible for dissipating the heat from the bottom of the battery pack. The second liquid cooling plate is designed as a side liquid cooling plate. The second liquid cooling plate is located on the side of the battery pack and is responsible for dissipating the heat from the side of the battery pack. On the second liquid cooling plate, a second closed cavity is specially designed for those areas where flow channels are not set. The second closed cavity is filled with phase change materials, which can undergo phase changes when the temperature changes, thereby absorbing or releasing heat, further improving the heat dissipation efficiency and effect. The characteristics of the phase change filler enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0043] In some examples, the liquid cooling assembly and the battery cells are both disposed in a box of the battery pack, and a buffer foam is disposed on a side of the first liquid cooling plate facing away from the battery cells.

[0044] The liquid cooling components and battery cells are cleverly arranged in the internal space of the battery pack. In order to ensure the heat dissipation effect and protect the battery cells, a layer of buffer foam is specially set on the side of the first liquid cooling plate away from the battery cells. This layer of buffer foam can not only play a certain role in heat insulation, reducing the direct transfer of heat to the battery cells, thereby protecting the battery cells from overheating, but also absorb vibration and impact to a certain extent, improving the stability and safety of the entire battery pack. This design takes into account the dual needs of heat dissipation and protection, ensuring the efficient performance and long-term reliability of the battery pack during operation.

[0045] In a second aspect, the present application provides a battery pack, comprising the above-mentioned liquid cooling assembly and a box, wherein the liquid cooling assembly is disposed in the box. The liquid cooling assembly can also be disposed as a part of the box.

[0046] The battery pack having the above-mentioned liquid cooling assembly can realize efficient energy utilization during the operation of the battery through the characteristics of the phase change filler, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0047] Specifically, the first closed cavity is used to fill the phase change filler. The characteristics of the phase change filler enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack. The phase change filler plays an important role in the operation of the battery. When the battery causes the temperature to rise to the melting point of the phase change material under severe working conditions, for example, when the temperature reaches 30°C, the phase change material begins to melt and absorbs a large amount of heat through its phase change process, thereby delaying the further increase in the battery temperature; or, when the battery causes the temperature to drop under cold working conditions, for example, when the battery is parked outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the solidification point of the phase change filler, the material solidifies and releases heat through latent heat, delaying the temperature drop of the liquid cooling plate and the battery cell. The above characteristics enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0048] In a third aspect, the present application provides an electrical device, including the above-mentioned battery pack and a device body, wherein the battery pack is arranged on the device body.

[0049] The electrical equipment having the above-mentioned battery pack can realize efficient energy utilization of the battery during operation through the characteristics of the phase change filler, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0050] Specifically, the first closed cavity is used to fill the phase change filler. The characteristics of the phase change filler enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack. The phase change filler plays an important role in the operation of the battery. When the battery causes the temperature to rise to the melting point of the phase change material under severe working conditions, for example, when the temperature reaches 30°C, the phase change material begins to melt and absorbs a large amount of heat through its phase change process, thereby delaying the further increase in the battery temperature; or, when the battery causes the temperature to drop under cold working conditions, for example, when the battery is parked outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the solidification point of the phase change filler, the material solidifies and releases heat through latent heat, delaying the temperature drop of the liquid cooling plate and the battery cell. The above characteristics enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings required for use in the examples or prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some examples of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0052] Figure 1This is a schematic diagram of the structure of the bottom liquid cooling plate and the box body in the liquid cooling assembly in an example of the present application.

[0053] Figure 2 This is a structural schematic diagram showing the first liquid cooling channel and the first closed cavity after the bottom liquid cooling plate in the liquid cooling assembly in an example of the present application is cut away.

[0054] Figure 3 For this application Figure 2 A schematic diagram of the enlarged structure at point A in the middle.

[0055] Figure 4 This is a schematic structural diagram of a liquid cooling assembly in an example of the present application in which a bottom liquid cooling plate is provided with two layers including a flow channel layer and a phase change layer.

[0056] Figure 5 This is a schematic diagram of a structural explosion when the bottom liquid cooling plate in the liquid cooling assembly in an example of the present application is provided with two layers including a flow channel layer and a phase change layer.

[0057] Figure 6 This is a structural schematic diagram of a liquid cooling assembly in an example of the present application in which the bottom liquid cooling plate is provided with three layers including a flow channel layer, a phase change layer and an assembly layer.

[0058] Figure 7 This is a schematic diagram of a structural explosion when the bottom liquid cooling plate in the liquid cooling assembly in an example of the present application is provided with three layers including a flow channel layer, a phase change layer and an assembly layer.

[0059] Figure 8 This is a schematic diagram of the structure of a side liquid cooling plate in a liquid cooling assembly in an example of the present application.

[0060] Fig. 9 This is a structural schematic diagram showing the second liquid cooling channel and the second closed cavity after the side liquid cooling plate in the liquid cooling assembly in an example of the present application is cut away.

[0061] Fig.10 This is a schematic structural diagram of a liquid cooling assembly in an example of the present application in which a side liquid cooling plate is provided with two layers including a flow channel layer and a phase change layer.

[0062] Fig.11 This is a schematic diagram of a structural explosion when a side liquid cooling plate in a liquid cooling assembly in an example of the present application is provided with two layers including a flow channel layer and a phase change layer.

[0063] Fig.12 This is a structural schematic diagram of a liquid cooling plate in a liquid cooling assembly in an example of the present application having three layers including a flow channel layer, a phase change layer and an assembly layer.

[0064] Fig.13 This is a schematic diagram of a structural explosion when a side liquid cooling plate in a liquid cooling assembly in an example of the present application is provided with three layers including a flow channel layer, a phase change layer and an assembly layer.

[0065] Reference numerals:

[0066] 100, first liquid cooling plate; 110, first liquid cooling channel; 120, first closed cavity; 130, channel layer; 140, phase change layer; 150, assembly layer; 200, second liquid cooling plate; 210, second liquid cooling channel; 220, second closed cavity; 300, housing. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present application.

[0068] In the liquid cooling components of related technologies, thermal management of battery packs is critical to performance and safety, and can be achieved through a variety of cooling methods, such as air, heat pipes, phase change materials, immersion cooling, and liquid cooling plate contact heat exchange cooling. Liquid cooling plate contact heat exchange cooling is widely used because of its high efficiency and ease of implementation.

[0069] To improve the heat exchange effect, high thermal conductivity three-series or six-series aluminum can be used as the liquid cooling plate material, but the high thermal conductivity of aluminum will affect the insulation effect at low temperatures. The heat generated by the battery cell is transferred to the box through the liquid cooling plate and carried away by the air. The temperature of the liquid cooling plate at the edge is usually lower, resulting in an increase in the temperature difference between modules, affecting the recyclability of the battery cell and the life of the battery pack.

[0070] To solve the low temperature insulation problem, you can add a buffer foam or vacuum insulation pad between the bottom of the liquid cooling plate and the bottom guard plate, but the cost is high. Another method is to stick insulation cotton on the outside of the box, but it is difficult to stick and fix, and durability needs to be considered. You can also spray a PVC layer for insulation, but the cost of spraying is high.

[0071] In order to solve the above technical problems, this application adopts a filling solution of phase change material. The phase change material melts when the battery operating temperature rises to the melting point, delaying the temperature rise and improving the temperature uniformity between modules. It is especially suitable for large module battery packs. For small battery packs, a closed cavity can be arranged in the area outside the flow channel to increase the volume content of the phase change material and improve the heat or cold storage capacity. The structural shape of the closed cavity can be arbitrary as long as it meets the cold plate bursting pressure.

[0072] Please refer to Figure 1-Figure 13 As shown, the first aspect of the present application proposes a liquid cooling assembly that enables the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0073] Reference Figure 1-Figure 3As shown, in some examples, a liquid cooling assembly is arranged in conjunction with a battery cell, and the liquid cooling assembly can dissipate heat from the battery cell. The liquid cooling assembly includes a first liquid cooling plate 100, at least one first closed cavity 120, and opposite filling pieces.

[0074] A first liquid-cooling channel 110 is arranged in the first liquid-cooling plate 100; at least one first closed cavity 120 is arranged in the first liquid-cooling plate 100, the first closed cavity 120 and the first liquid-cooling channel 110 are arranged in different areas of the first liquid-cooling plate 100, and the first closed cavity 120 and the first liquid-cooling channel 110 are arranged independently of each other; a phase change filler is filled in the first closed cavity 120, and at least part of the first closed cavity 120 is filled with the phase change filler.

[0075] The function of the above-mentioned liquid cooling component is to provide heat dissipation for components such as battery cells that need heat dissipation. The following is an exemplary explanation using the battery cell as an example. The liquid cooling component mainly includes a first liquid cooling plate 100 and at least one first closed cavity 120. The first liquid cooling plate 100 is installed on one side of the battery cell, and a first liquid cooling channel 110 is arranged inside the first liquid cooling plate 100. The first liquid cooling channel 110 is used to circulate coolant to take away the heat generated by the battery cell. The first closed cavity 120 and the first liquid cooling channel 110 are arranged in different areas of the first liquid cooling plate 100. It can also be said that at least one first closed cavity 120 is arranged in an area where the first liquid cooling plate 100 is not provided with a channel, or the first closed cavity 120 is arranged on the side of the first liquid cooling channel 110 away from the battery cell. The first closed cavity 120 is used to fill the phase change filler. Through the characteristics of the phase change filler, the battery can achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack. The phase-change filler may be filled in the first closed cavity 120 , and each first closed cavity 120 is filled with the phase-change filler, which can further improve energy utilization.

[0076] Specifically, the phase change filler is a filling structure of a special material, which is specifically filled in the first closed cavity 120, and each first closed cavity 120 is filled with a phase change filler. This phase change filler plays an important role in the operation of the battery. When the battery causes the temperature to rise to the melting point of the phase change material under severe working conditions, for example, when the temperature reaches 30°C, the phase change material begins to melt and absorbs a large amount of heat through its phase change process, thereby delaying the further increase of the battery temperature; or, when the battery causes the temperature to drop under cold working conditions, for example, when the battery is parked outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the solidification point of the phase change filler, the material solidifies and releases heat through latent heat, delaying the temperature drop of the liquid cooling plate and the battery cell. The above characteristics enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0077] The above-mentioned first closed cavity 120 can be a certain number of closed cavities formed by stamping, blowing or extrusion on the outer edge of the liquid cooling plate flow channel (depending on the manufacturing process of the liquid cooling plate itself), and a certain amount of phase change material (phase change filler) is filled into these cavities. This phase change material can be a solid phase change material to avoid excessive volume change during phase change. This phase change material can be an organic phase change material, or an inorganic phase change material or a eutectic phase change material, but preferably a hydrated salt material with a large degree of supercooling, whose solidification point can be within a low temperature range, but the melting point is at room temperature or within the suitable operating temperature range of the battery, such as 25°C to 45°C. The advantage of this is that when the car is parked outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the solidification point of the phase change filler, the material solidifies and releases heat through latent heat, delaying the temperature drop of the liquid cooling plate and the battery cell.

[0078] When the battery temperature rises to the melting point of the phase change material under severe working conditions, such as 30°C, the phase change material melts and delays the temperature rise of the battery, achieving efficient energy utilization to reduce energy consumption. For the layout of the closed cavity, it is preferably arranged at the edge area where the liquid cooling plate and the box body 300 are fixed. Usually, the temperature drop in these areas is most obvious in low temperature environments. Therefore, the energy storage characteristics of the phase change material can be used to delay the temperature drop at the edge of the liquid cooling plate and improve the temperature uniformity of the module. It is suitable for battery packs with a large liquid cooling plate area (heat accumulation is prone to occur between large modules, and the fast heat dissipation at the edge leads to a large temperature difference).

[0079] The first closed cavity 120 can be an integrally formed closed cavity. The closed cavity is preferably arranged at the edge area where the liquid cooling plate and the box body 300 are fixed. The temperature drop in these areas is most obvious in low temperature environments. Therefore, the energy storage characteristics of the phase change material can be used to delay the temperature drop at the edge of the liquid cooling plate and improve the temperature uniformity of the module. This design is particularly suitable for battery packs with large liquid cooling plate areas, because heat accumulation is easy to occur between large modules, and the fast heat dissipation at the edges leads to large temperature differences.

[0080] For smaller battery packs, the temperature difference between modules is relatively small, and closed cavities can be arranged as much as possible in the area outside the flow channel. The purpose of this is to increase the volume content of the phase change material, thereby improving the ability to store heat or cold. There are no special regulations for the structural shape of the closed cavity, and the closed cavity can be any shape that meets the burst pressure of the cold plate. For example, for stamping or blowing liquid cooling plates, long strips or wavy strips can be used to increase the filling amount of phase change material. For aluminum extruded profile plates, part of the cavity can be reserved during the extrusion process, and then this part of the cavity can be filled with phase change material and sealed.

[0081] In addition, the stamping structure filled with phase change material can also enhance the strength of the liquid cooling plate and reduce bending to a certain extent. The temperature improvement of the whole package per liter of phase change material is:△ T = γ*ρ / 1000*n*cp*m, where γ is the latent heat of the phase change material (kJ / kg), ρ is the density of the phase change material (kg / m 3 ), n is the number of single cells, cp is the specific heat of single cell (J / (kg·K)), and m is the mass of single cell (kg).

[0082] Taking a battery pack with 80 cells as an example, the heat absorbed by all cells when the temperature drops by 1K is Q = cp*m*Δt = 1000J / (kg·K)*3kg*1K*80 = 240kJ. Taking ordinary hydrated salt as an example (sodium sulfate decahydrate), its latent heat is 250kJ / kg and its density is 1.5g / cm 3 , 240 / 250 / 1.5=0.64dm 3 That is, when filling 1L of phase change material, the temperature of the whole package can be increased or decreased by 1.6℃ when keeping warm at low temperature or cooling at high temperature, without the need for additional energy input. The above is an example of 80 battery cells, and the number of battery cells is set according to the needs.

[0083] When the number of batteries in the whole pack is reduced, the heat taken away / input into the battery cell by the outside world is less during low-temperature or high-temperature insulation, and the energy storage effect of the phase change material is more obvious at this time. In addition, when the volume, latent heat or density of the phase change material filled increases, the effect can be further improved, that is, the heat storage / release of the closed cavity per unit volume is greater, reducing the heat dissipation or increase of the battery cell body. In general, when the need for insulation at low or high temperatures is urgent, phase change materials can be further arranged in the area where the flow channel is not set on the liquid cooling plate, or a certain flow channel area can be reduced to increase insulation. Alternatively, the stamped liquid cooling plate can be designed with three layers, and another layer of plate is arranged on the back of the flow channel plate and welded to the back of the flow channel plate, and phase change material is filled in between. For aluminum extruded profile plates, double-layer flow channels can also be set, and phase change materials can be filled on the flow channel away from the battery cell side.

[0084] For smaller battery packs, the temperature difference between modules is relatively small, and closed cavities can be arranged as much as possible in the area outside the flow channel. The purpose is to increase the volume content of the phase change material and improve the heat or cold storage capacity. There are no special regulations for the structural shape of the closed cavity. It can be any shape that meets the burst pressure of the cold plate. For stamping or blowing liquid cooling plates, it can be a long strip or a wavy strip to increase the amount of phase change material filling. For aluminum extruded profiles, some cavities can be reserved during the extrusion process, and these cavities are filled with phase change material and then sealed.

[0085] In general, when the need for low or high temperature insulation is very urgent, phase change materials can be further arranged in the area where the liquid cooling plate is not provided with flow channels, or a certain flow channel area can be reduced to increase the insulation effect. Alternatively, the stamped liquid cooling plate can be designed as a three-layer structure, and another layer of plate is arranged on the back of the flow channel plate, and it is welded to the back of the flow channel plate, and phase change material is filled in between. For aluminum extruded profile plates, double-layer flow channels can be set, and phase change materials can be filled in the flow channels away from the battery cell side.

[0086] The shape of the first closed cavity 120 in the present application can be set according to the location. The shape in the drawings is only an exemplary description. The first closed cavity 120 can be a strip, spherical, cylindrical, U-shaped, serpentine, etc. There can be multiple first closed cavities 120, or one continuous one.

[0087] When a plurality of first sealed cavities 120 are provided, some of the first sealed cavities may be connected. For example, when the phase change filler is a gas phase change material, some cavities may be provided as spare buffer cavities.

[0088] In some examples, in the thickness direction of the first liquid cooling plate 100 , the first liquid cooling plate 100 has a first side surface and a second side surface, the first side surface is a plane, and the second side surface is an uneven surface;

[0089] The first side surface is used to install the battery cell; the first closed cavity 120 is opened in the area of ​​the first liquid cooling plate 100 where no flow channel is set, and the area of ​​the first liquid cooling plate 100 where no flow channel is set includes at least one of the end and the groove area of ​​the second side surface.

[0090] In the above structure, in the thickness direction of the first liquid cooling plate 100, the first liquid cooling plate 100 has a first side surface and a second side surface. Among them, the first side surface is designed to be a flat plane, and the first side surface can be conveniently used to install the battery cell, and can provide the connection stability between the first side surface and the battery cell, thereby ensuring the stability and reliability of the battery pack. In addition, after the first side surface is set as a flat surface, the contact area between the first side surface and the battery cell can be increased, ensuring that the heat on the battery cell can be transferred from the first side surface to the first liquid cooling plate 100 faster and more effectively.

[0091] The second side surface presents an uneven surface structure. As can be seen from the above, the second side surface is the surface away from the battery cell. By setting the second side surface as an uneven surface, the heat dissipation efficiency of the first liquid cooling plate 100 can be improved, and the heat generated by the battery cell can be quickly transferred from the first side surface to the second side surface, thereby ensuring that the battery cell can always maintain the operating temperature.

[0092] The above-mentioned design opens at least one first closed cavity 120 on the first liquid cooling plate 100. The closed cavity is arranged in an area where no flow channel is arranged on the first liquid cooling plate 100. Specifically, the area where no flow channel is arranged includes at least one of the end and the groove area of ​​the second side. Such a design ensures that the first closed cavity 120 will not conflict with the cooling flow channel in the liquid cooling plate, thereby ensuring the smooth operation of the cooling system.

[0093] The first closed cavity 120 can be used to fill the phase change filler. The phase change filler is a special material that can absorb and release heat through its phase change characteristics during the operation of the battery. This characteristic enables the battery to achieve efficient energy utilization during operation, thereby significantly reducing energy consumption. In this way, the service life of the corresponding battery pack can be effectively improved, ensuring that the battery maintains good performance during long-term operation.

[0094] In order to further improve the energy utilization, each first closed cavity 120 can be filled with a phase change filler. This comprehensive filling strategy ensures that each closed cavity can fully play its role, thereby achieving the best thermal management effect in the entire battery system. In this way, the battery pack can maintain a stable temperature under various working conditions, thereby ensuring efficient operation of the battery and extending its service life.

[0095] In some examples, in the thickness direction of the first liquid cooling plate 100 , the first liquid cooling plate 100 has a first side surface and a second side surface;

[0096] The first liquid cooling plate 100 is provided with two layers in the thickness direction. A first liquid cooling channel 110 is provided in a layer of the first liquid cooling plate 100 close to the first side surface, and a first closed cavity 120 is provided in a layer of the first liquid cooling plate 100 close to the second side surface.

[0097] The above structure can further optimize the cooling effect. Specifically, the first liquid cooling plate 100 can be provided with a two-layer structure in the thickness direction. A first liquid cooling channel 110 is provided in a layer of the first liquid cooling plate 100 close to the first side surface. The first side surface can be connected to or abut the battery cell to increase the contact area between the first side surface and the battery cell, ensuring that the heat on the battery cell can be transferred from the first side surface to the first liquid cooling plate 100 faster and more effectively.

[0098] A first closed cavity 120 is provided in a layer of the first liquid cooling plate 100 close to the second side surface, and the first closed cavity 120 can be used to fill the phase change filler. The phase change filler is a special material that can absorb and release heat through its phase change characteristics during the operation of the battery. This characteristic enables the battery to achieve efficient energy utilization during operation, thereby significantly reducing energy consumption. In this way, the service life of the corresponding battery pack can be effectively improved, ensuring that the battery maintains good performance during long-term operation. This double-layer structure design not only ensures the smoothness of the cooling flow channel, but also ensures the independence of the closed cavity and the effective use of the phase change filler. The above-mentioned double-layer structure can be a profile plate with upper and lower planes.

[0099] Based on the above embodiments, when designing and constructing a battery pack, the first side has the ability to be directly or indirectly connected to the battery cell. When a direct connection method is adopted, the first side will be in direct and close contact with the surface of the battery cell to form a direct heat conduction path. This direct contact method can ensure that heat is quickly transferred from the battery cell to the first side, thereby effectively performing thermal management.

[0100] When an indirect connection is used, the first side surface is connected to the surface of the battery cell through a heat-conducting layer. This heat-conducting layer can be made of a variety of materials, such as thermally conductive glue or a flexible thermally conductive pad. These heat-conducting layer materials have good thermal conductivity and can effectively transfer the heat generated by the battery cell to the first side surface. In this way, even if there is a certain gap or incomplete contact between the battery cell and the first side surface, effective heat transfer can be guaranteed.

[0101] The thermal conductive adhesive can be a viscous thermal conductive material with good bonding and thermal conductivity, and can form a stable thermal conductive channel between the battery cell and the first side. The flexible thermal conductive pad is an elastic thermal conductive material that can provide a certain buffering effect between the battery cell and the first side while maintaining a good thermal conductive effect. The selection and application of these two thermal conductive layer materials can be optimized and adjusted according to the specific battery design and thermal management requirements.

[0102] In some examples, the liquid cooling assembly further includes a second liquid cooling plate 200, and the second liquid cooling plate 200 is disposed on a side of the first liquid cooling plate 100 close to the battery cell;

[0103] In the thickness direction of the second liquid cooling plate 200 , the second liquid cooling plate 200 has a third side surface and a fourth side surface, the third side surface is a plane, and the fourth side surface is an uneven surface;

[0104] A second closed cavity 220 is provided in an area of ​​the second liquid cooling plate 200 where no flow channel is provided, and at least a portion of the second closed cavity 220 is filled with a phase change filler. The area of ​​the second liquid cooling plate 200 where no flow channel is provided includes at least one of the end portion and the groove area of ​​the second side surface.

[0105] The second liquid cooling plate 200 is arranged on the side of the first liquid cooling plate 100 close to the battery cell. The second liquid cooling plate 200 can be called a side liquid cooling plate, and side liquid cooling plates can be arranged on both sides of the battery cell. In the thickness direction of the second liquid cooling plate 200, the second liquid cooling plate 200 has a third side and a fourth side. Among them, the second liquid cooling plate 200 between the two battery cells can be used as a shared liquid cooling plate, and the third side and the fourth side are both set to a flat plane; the second liquid cooling plate 200 that is set on one side of the battery cell and is not shared can also present an uneven surface feature on the fourth side away from the battery cell as needed. Such a design enables the second liquid cooling plate 200 to better contact the battery cell, thereby improving the cooling effect.

[0106] A second closed cavity 220 is provided on the second liquid cooling plate 200. These second closed cavities 220 are also provided in areas on the second liquid cooling plate 200 where no flow channels are provided, ensuring the smoothness of the flow channels and the independence of the closed cavities. Specifically, the areas on the second liquid cooling plate 200 where no flow channels are provided include at least one of the groove areas on the end and the fourth side. Such a design enables the second closed cavity 220 to be effectively filled with the phase change filler, thereby utilizing the characteristics of the phase change filler to achieve efficient energy utilization during battery operation. In this way, energy consumption can be significantly reduced and the service life of the corresponding battery pack can be increased.

[0107] The phase change filler can also be filled in the second closed cavity 220, and each second closed cavity 220 is filled with a phase change filler. This comprehensive filling method can further improve the energy utilization rate and ensure the stability and efficiency of the battery pack during long-term operation.

[0108] In some examples, the phase change filler is at least one of a liquid phase change material, a gas phase change material, or a solid phase change material.

[0109] Phase change fillers usually use one or more of liquid, gas or solid phase change materials. In order to ensure that the volume change during the phase change process is not too large, thereby affecting the stability and performance of the equipment, the choice of phase change materials tends to use solid phase change materials. These solid phase change materials can be further subdivided into organic phase change materials, inorganic phase change materials or eutectic phase change materials. Among these options, hydrated salt materials with a large degree of supercooling can be further used, because the freezing point of such materials can be within a relatively low temperature range, and their melting point is set at room temperature or a suitable operating temperature range for the battery, such as 25°C to 45°C.

[0110] The benefit of this design is that in a cold environment, when the vehicle is parked outdoors and the temperature of the liquid cooling plate drops to the solidification point of the phase change filler, the material solidifies and releases heat by releasing latent heat. This process helps to delay the temperature drop of the liquid cooling plate and the battery cells, thereby protecting the performance and life of the battery in a low temperature environment. Conversely, when the battery is under severe working conditions and the temperature rises to the melting point of the phase change material, for example, 30°C, the phase change material will begin to melt. This process also helps to delay the further increase in battery temperature, and through the phase change endothermic effect of the phase change material, efficient energy utilization is achieved, thereby reducing energy consumption and ensuring the stability and safety of the battery in a high temperature environment. In this way, the phase change material not only improves the temperature adaptability of the battery, but also optimizes the battery's energy management, prolongs the battery's service life, and also improves the energy efficiency performance of the entire battery system.

[0111] In some examples, the phase change filler is a solid phase change material, and the solid phase change material includes one or a mixture of two or more of an organic phase change material, an inorganic phase change material, or a eutectic phase change material.

[0112] The phase change filler can be further composed of solid phase change materials, which can be organic phase change materials, inorganic phase change materials, or eutectic phase change materials, which can be used alone or as a mixture of two or more materials. When designing these solid phase change materials, their physical and chemical properties are specially considered to ensure that they can effectively change phases within a specific temperature range, thereby realizing the storage and release of thermal energy.

[0113] Specifically, solid phase change materials can be organic phase change materials, which usually have good phase change properties and low supercooling, and can absorb or release a large amount of latent heat during the phase change process, which is very beneficial for temperature control. In addition, it can also be inorganic phase change materials, which often have a higher melting point and better thermal stability, and are suitable for use at higher temperatures. Eutectic phase change materials are mixtures of two or more substances, and their phase change temperature can be precisely controlled by adjusting the proportion of the components.

[0114] Among these materials, hydrated salt materials with a large degree of supercooling are preferred because the freezing point of such materials can be within a relatively low temperature range, while their melting point can be set at room temperature or within a suitable operating temperature range for the battery, such as 25°C to 45°C. Such a design has obvious advantages, especially when parking outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the freezing point of the phase change filler, the material solidifies and releases heat by releasing latent heat, which can effectively delay the temperature drop of the liquid cooling plate and the battery cell.

[0115] On the contrary, when the battery is under severe working conditions and the temperature rises to the melting point of the phase change material, such as 30°C, the phase change material will begin to melt and delay the further increase of the battery temperature by absorbing heat. The use of this phase change material can not only achieve efficient energy utilization, but also effectively reduce energy consumption, thereby improving the overall performance and service life of the battery. In this way, the phase change filler plays a vital role in battery temperature management, ensuring that the battery can maintain the best working condition under various working environments.

[0116] In some examples, at least one first closed cavity 120 is disposed on the outer edge of the first liquid cooling plate 100 where no flow channel is disposed by at least one of stamping, blowing, and extrusion.

[0117] At least one first closed cavity 120 is arranged on the outer edge of the first liquid cooling plate 100 where no flow channel is provided by at least one of stamping, blowing, and extrusion. This arrangement can ensure that the first closed cavity 120 will not cause any interference with the first liquid cooling channel 110 in the first liquid cooling plate 100, thereby avoiding potential structural problems. At the same time, the setting of the first closed cavity 120 can also perform temperature compensation for the uncovered area of ​​the first liquid cooling channel 110, ensuring that the temperature distribution of the entire liquid cooling plate is more uniform and improving the cooling efficiency. After the first closed cavity 120 is filled with the phase change filler, the characteristics of the phase change filler can enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0118] The formation of the first closed cavity 120 can be achieved by stamping, blowing or extruding the outer edge of the liquid cooling plate flow channel, depending on the manufacturing process of the liquid cooling plate itself. These methods can form a certain number of closed cavities and fill these cavities with a certain amount of phase change material (phase change filler). This phase change material can be a solid phase change material to avoid excessive volume change during phase change, thereby maintaining the structural stability of the liquid cooling plate.

[0119] In some examples, the first liquid cooling plate 100 is a first liquid cooling plate, a first liquid cooling channel 110 is arranged in a cavity layer near the battery cell in the first liquid cooling plate, and a cavity on one side of the first liquid cooling plate away from the battery cell is a first closed cavity 120 .

[0120] Reference Figure 4 and Figure 5Alternatively, the first liquid cooling plate 100 is a structure of at least two layers, including a flow channel layer 130 and a phase change layer 140, the flow channel layer 130 is arranged close to the battery cell, the flow channel layer 130 is provided with a first liquid cooling flow channel 110, the phase change layer 140 is arranged on a side of the flow channel layer 130 away from the battery cell, a first closed cavity 120 filled with a phase change filler is arranged in the phase change layer 140, and the flow channel layer 130 is fixedly connected to the phase change layer 140. The fixed connection method can be welding, clamping, bundling, bolt connection, etc.

[0121] The first liquid cooling plate 100 can adopt the design of the first liquid cooling plate. In this design, the first liquid cooling plate includes two parts, and the first liquid cooling channel 110 is specially designed inside the cavity layer close to the battery cell. The function of these channels is to effectively absorb and conduct the heat generated by the battery cell during operation through the circulating coolant, thereby achieving a cooling effect. On the other side of the first liquid cooling plate, that is, the cavity layer away from the battery cell, it is designed as a closed cavity, which can play a certain role in heat insulation and also provides a stable structural support for the liquid cooling system.

[0122] Alternatively, the first liquid cooling plate 100 may also adopt a design of at least two layers, which includes a flow channel layer 130 and a phase change layer 140. The flow channel layer 130 is the layer directly close to the battery cell. The first liquid cooling flow channel 110 is arranged on the flow channel layer 130. These flow channels are also used for the circulation of the coolant to achieve cooling of the battery cell. The phase change layer 140 is located on the side of the flow channel layer 130 away from the battery cell. A closed cavity filled with phase change material is arranged inside the phase change layer 140. These phase change materials will undergo phase change after absorbing heat, thereby absorbing more heat and further improving the cooling efficiency.

[0123] The flow channel layer 130 and the phase change layer 140 are fixedly connected by welding, clamping, bundling, bolting and other methods to ensure the structural stability and reliability of the entire liquid cooling plate.

[0124] Reference Figure 6 and Figure 7 In addition, in order to further improve the cooling efficiency and structural integrity, the first liquid cooling plate 100 can also be designed as a three-layer structure. In this design, in addition to the flow channel layer 130 and the phase change layer 140, an assembly layer 150 is also included. The assembly layer 150 is located on the side of the phase change layer 140 away from the flow channel layer 130. The main function of the assembly layer 150 is to fix the entire liquid cooling plate in the battery pack box 300 to ensure the stability of the position of the liquid cooling plate inside the battery pack, while facilitating the assembly and maintenance of the entire battery pack. The design of the assembly layer 150 can be adjusted accordingly according to the actual installation requirements and the structural characteristics of the battery pack to achieve the best cooling effect and installation convenience.

[0125] Reference Figures 8 to 13 In some examples, the liquid cooling assembly further includes a second liquid cooling plate 200, the first liquid cooling plate 100 is a bottom liquid cooling plate, the second liquid cooling plate 200 is a side liquid cooling plate, and a second closed cavity 220 is provided in an area of ​​the second liquid cooling plate 200 where no flow channel is provided, and the second closed cavity 220 is filled with a phase change filler.

[0126] The design of the liquid cooling assembly includes two main parts, namely the first liquid cooling plate 100 and the second liquid cooling plate 200. Among them, the first liquid cooling plate 100 is usually designed as a bottom liquid cooling plate. The first liquid cooling plate 100 is located at the bottom of the battery pack and is mainly responsible for the heat dissipation of the bottom of the battery pack. The second liquid cooling plate 200 is designed as a side liquid cooling plate. The second liquid cooling plate 200 is located on the side of the battery pack and is responsible for the heat dissipation of the side of the battery pack. On the second liquid cooling plate 200, those areas where the flow channel is not set are specially designed with a second closed cavity 220. The second closed cavity 220 is filled with phase change materials. These materials can undergo phase changes when the temperature changes, thereby absorbing or releasing heat, and further improving the heat dissipation efficiency and effect. The characteristics of the phase change filler enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0127] The second liquid cooling plate 200 can be arranged in a manner similar to the first liquid cooling plate 100, and part of the structure can be applied to the arrangement of the first liquid cooling plate 100, which will not be described in detail here. Fig.10 and Fig.11 A schematic structural diagram is shown when the side liquid cooling plate is provided with two layers including a flow channel layer and a phase change layer. Fig.12 and Fig.13 A schematic diagram of the structure is shown when the side liquid cooling plate is provided with three layers including a flow channel layer, a phase change layer and an assembly layer.

[0128] In some examples, the liquid cooling assembly and the battery cells are both disposed in the box body 300 of the battery pack, and a buffer foam is disposed on a side of the first liquid cooling plate 100 facing away from the battery cells.

[0129] The liquid cooling components and battery cells are cleverly arranged in the internal space of the battery pack. In order to ensure the heat dissipation effect and protect the battery cells, a layer of buffer foam is specially provided on the side of the first liquid cooling plate 100 away from the battery cells. This layer of buffer foam can not only play a certain role in heat insulation, reduce the direct transfer of heat to the battery cells, thereby protecting the battery cells from overheating, but also absorb vibration and impact to a certain extent, improving the stability and safety of the entire battery pack. This design takes into account the dual needs of heat dissipation and protection, ensuring the efficient performance and long-term reliability of the battery pack during operation.

[0130] In a second aspect, the present application provides a battery pack, comprising the above-mentioned liquid cooling assembly and a box 300, wherein the liquid cooling assembly is disposed in the box 300. The liquid cooling assembly may also be disposed as a part of the box 300.

[0131] The battery pack having the above-mentioned liquid cooling assembly can realize efficient energy utilization during the operation of the battery through the characteristics of the phase change filler, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0132] Specifically, the first closed cavity 120 is used to fill the phase change filler. The characteristics of the phase change filler enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack. The phase change filler plays an important role in the operation of the battery. When the battery causes the temperature to rise to the melting point of the phase change material under severe working conditions, for example, when the temperature reaches 30°C, the phase change material begins to melt and absorbs a large amount of heat through its phase change process, thereby delaying the further increase in the battery temperature; or, when the battery causes the temperature to drop under cold working conditions, for example, when the battery is parked outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the solidification point of the phase change filler, the material solidifies and releases heat through latent heat, delaying the temperature drop of the liquid cooling plate and the battery cell. The above characteristics enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0133] In a third aspect, the present application provides an electrical device, including the above-mentioned battery pack and a device body, wherein the battery pack is arranged on the device body.

[0134] The electrical equipment having the above-mentioned battery pack can realize efficient energy utilization of the battery during operation through the characteristics of the phase change filler, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0135] Specifically, the first closed cavity 120 is used to fill the phase change filler. The characteristics of the phase change filler enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack. The phase change filler plays an important role in the operation of the battery. When the battery causes the temperature to rise to the melting point of the phase change material under severe working conditions, for example, when the temperature reaches 30°C, the phase change material begins to melt and absorbs a large amount of heat through its phase change process, thereby delaying the further increase in the battery temperature; or, when the battery causes the temperature to drop under cold working conditions, for example, when the battery is parked outdoors in a cold environment, when the temperature of the liquid cooling plate drops to the solidification point of the phase change filler, the material solidifies and releases heat through latent heat, delaying the temperature drop of the liquid cooling plate and the battery cell. The above characteristics enable the battery to achieve efficient energy utilization during operation, thereby reducing energy consumption and increasing the service life of the corresponding battery pack.

[0136] The above-mentioned electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, electric tools, energy storage equipment, amusement equipment, elevators and lifting equipment, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.; spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys or electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.; energy storage equipment can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be carousels, jumping machines, etc. This application does not impose special restrictions on the above-mentioned electrical equipment.

[0137] The same or similar reference numerals in the drawings of this application correspond to the same or similar parts. In the description of this application, it should be understood that if the terms "upper", "lower", "left", "right", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0138] The above are only preferred examples of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A liquid cooling component, characterized in that: The liquid cooling assembly comprises: A first liquid cooling plate, wherein a first liquid cooling channel is disposed in the first liquid cooling plate; At least one first closed cavity is arranged in the first liquid cooling plate, the first closed cavity and the first liquid cooling channel are arranged in different areas of the first liquid cooling plate, and the first closed cavity and the first liquid cooling channel are arranged independently of each other; A phase-change filling member is filled in the first closed cavity, and at least a portion of the first closed cavity is filled with the phase-change filling member.

2. The liquid cooling assembly according to claim 1, characterized in that: In the thickness direction of the first liquid cooling plate, the first liquid cooling plate has a first side surface and a second side surface, the first side surface is a plane, and the second side surface is an uneven surface; The first side surface is used for installing the battery cell; the first closed cavity is opened in the area of ​​the first liquid cooling plate where no flow channel is set, and the area of ​​the first liquid cooling plate where no flow channel is set includes at least one of the end and the groove area of ​​the second side surface.

3. The liquid cooling assembly according to claim 1, characterized in that: In the thickness direction of the first liquid cooling plate, the first liquid cooling plate has a first side surface and a second side surface; The first liquid cooling plate is provided with two layers in the thickness direction, the first liquid cooling channel is provided in a layer of the first liquid cooling plate close to the first side surface, and the first closed cavity is provided in a layer of the first liquid cooling plate close to the second side surface.

4. The liquid cooling assembly according to any one of claims 1 to 3, characterized in that: The liquid cooling assembly further includes a second liquid cooling plate, which is disposed on a side of the first liquid cooling plate close to the battery cell; In the thickness direction of the second liquid cooling plate, the second liquid cooling plate has a third side surface and a fourth side surface, the third side surface is a plane, and the fourth side surface is an uneven surface; A second closed cavity is provided in the area without flow channel on the second liquid cooling plate, and at least a portion of the second closed cavity is filled with the phase change filler. The area without flow channel on the second liquid cooling plate includes at least one of the end portion and the groove area of ​​the second side surface.

5. The liquid cooling assembly according to claim 1, characterized in that: The phase change filler is at least one of a liquid phase change material, a gas phase change material or a solid phase change material.

6. The liquid cooling assembly according to claim 5, characterized in that: The phase change filler is a solid phase change material, and the solid phase change material includes one or a mixture of two or more of an organic phase change material, an inorganic phase change material or a eutectic phase change material.

7. The liquid cooling assembly according to claim 6, characterized in that: The phase change filler is a hydrated salt material with a supercooling degree within a preset range, and the preset range is 25°C to 45°C.

8. The liquid cooling assembly according to claim 1, characterized in that: At least one of the first closed cavities is arranged on the outer edge of the first liquid cooling plate where no flow channel is arranged by at least one of stamping, blowing and extrusion.

9. A battery pack, characterized in that: include: The liquid cooling assembly according to any one of claims 1 to 8; and, A box body, wherein the liquid cooling component is arranged in the box body.

10. An electrical device, characterized in that: include: The battery pack as claimed in claim 9; and, The device body is provided with the battery pack.

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