Liquid cooling plate, battery pack box body, power battery pack and vehicle

Abstract

The utility model provides a liquid cooling plate, a battery pack box body, a power battery pack and a vehicle. The liquid cooling plate comprises a body and a composite plate, the body and the composite board are arranged in a stacked mode, the body and the composite board are of an integrated structure, and a flow channel used for circulation of cooling liquid is formed in the body. The liquid cooling plate disclosed by the utility model consists of the body and the composite plate, the strength performance and the rigidity performance of the liquid cooling plate are greatly improved, the pressure range capable of bearing an external load is also greatly improved, a plurality of battery monomers can be effectively supported, and the damage to a flow channel in the liquid cooling plate is not easily caused, so that the normal work of the liquid cooling plate is ensured. And meanwhile, the heat insulation performance of the liquid cooling plate with the composite structure is improved, so that the internal temperature of the battery pack box body does not influence the touch or carrying of the battery pack by personnel from the outside, and the use of the battery pack is greatly facilitated.

Description

Technical Field

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

[0002] With the support of energy conservation and emission reduction policies, the application of new energy technologies has been increasingly valued by the industry. New energy vehicles are increasingly valued by vehicle manufacturers and favored by consumers due to their zero pollution and zero emission characteristics. The power battery pack is the core component of new energy vehicles, providing power for the entire vehicle. Its performance directly affects the power performance and endurance of new energy vehicles.

[0003] In the prior art, a power battery pack is usually composed of a battery cell, a frame, a liquid cooling plate, etc. The battery cell is the core part of the power battery pack and determines the charging and discharging performance of the battery pack; the frame is arranged around the battery cell to provide strength, rigidity and sealing performance for the entire battery pack; the liquid cooling plate is arranged at the bottom of the battery cell, which can not only support the battery cell, but also cool the battery cell to ensure the safe use of the battery pack.

[0004] However, in the prior art, the liquid cooling plate is usually an aluminum plate with low strength and rigidity. When the liquid cooling plate is placed at the bottom of the battery pack box, it is subjected to the pressure of multiple battery cells in the battery pack box, which may cause deformation and damage to the liquid cooling plate, resulting in damage to the flow channel structure in the liquid cooling plate and inability to circulate the coolant normally. In addition, the single aluminum plate structure has poor thermal insulation ability, which makes it inconvenient for people to touch or carry the battery pack from the outside, seriously affecting the use of the battery pack. Utility Model Content

[0005] In view of this, the utility model aims to provide a liquid cooling plate, a battery pack box, a power battery pack and a vehicle, so as to at least solve the problem of poor strength, stiffness and thermal insulation performance of the liquid cooling plate in the prior art.

[0006] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0007] The utility model provides a liquid cooling plate, comprising a body and a composite plate; the body and the composite plate are stacked and formed into an integral structure, wherein a flow channel for circulating cooling liquid is arranged in the body.

[0008] Furthermore, the composite panel includes a composite upper panel and a composite lower panel; the composite upper panel and the composite lower panel are connected to each other, wherein the composite upper panel is located on a side close to the main body.

[0009] Furthermore, a groove structure is provided on the composite upper plate, and the groove structure has the same layout shape and corresponding layout position as the flow channel.

[0010] Furthermore, the composite board also includes a foam layer, and the foam layer is filled between the composite upper board and the composite lower board.

[0011] Furthermore, the main body includes an upper plate of a cold plate and a lower plate of a cold plate; the upper plate of the cold plate is connected to the lower plate of the cold plate, wherein the lower plate of the cold plate is provided with the flow channel, and the upper plate of the cold plate is provided with a pipe joint, and the pipe joint is used to connect the flow channel with an external pipeline.

[0012] Furthermore, the upper plate of the cold plate is an aluminum plate, and the lower plate of the cold plate is a steel plate.

[0013] Another object of the present invention is to provide a battery pack case, comprising a frame and a liquid cooling plate as described in any one of the above items; the frame is arranged around the liquid cooling plate and together with the liquid cooling plate defines a receiving cavity for receiving a battery cell.

[0014] Furthermore, the frame is an aluminum frame or a rolled steel frame.

[0015] Furthermore, the body comprises an upper cold plate and a lower cold plate, the upper cold plate is an aluminum plate, and the lower cold plate is a steel plate;

[0016] The aluminum frame is fixedly connected to the upper plate of the cold plate, or the rolled steel frame is fixedly connected to the lower plate of the cold plate.

[0017] Furthermore, the area of ​​the upper plate of the cold plate is greater than the area of ​​the lower plate of the cold plate;

[0018] The edge of the upper plate of the cold plate extends toward the aluminum frame to form a first connecting portion, and the first connecting portion is fixedly connected to the aluminum frame.

[0019] Furthermore, the area of ​​the upper plate of the cold plate is smaller than the area of ​​the lower plate of the cold plate;

[0020] The edge of the lower plate of the cold plate extends toward the rolled steel frame to form a second connecting portion, and the second connecting portion is fixedly connected to the rolled steel frame.

[0021] Furthermore, the upper plate of the cold plate is provided with a pipe joint, and the pipe joint is used to connect the flow channel with an external pipeline;

[0022] The pipe joint is arranged outside the frame; or, the pipe joint is arranged inside the frame, and the interface portion of the pipe joint passes through the frame and is exposed outside the frame.

[0023] Another object of the present utility model is to provide a power battery pack, comprising a plurality of battery cells and a battery pack box as described in any one of the above items, wherein the plurality of battery cells are arranged in the accommodating cavity.

[0024] Another object of the present invention is to provide a vehicle, comprising the aforementioned power battery pack.

[0025] Compared with the prior art, the liquid cooling plate, battery pack box, power battery pack and vehicle described in the utility model have the following advantages:

[0026] In the embodiment of the utility model, the liquid cooling plate is composed of two parts, the main body and the composite plate. It is no longer a single aluminum plate. Its strength and rigidity properties are greatly improved, and the pressure range that can withstand external loads is also greatly improved. When the liquid cooling plate is placed at the bottom of the battery pack case, it can effectively support multiple battery cells and is not easy to cause damage to the flow channel in the liquid cooling plate, thereby ensuring the normal operation of the liquid cooling plate. At the same time, the thermal insulation performance of the liquid cooling plate with a composite structure is improved, so that the internal temperature of the battery pack case will not affect the touch or handling of the battery pack by personnel from the outside, thereby greatly facilitating the use of the battery pack. At the same time, the weight of the composite plate is relatively light, which is conducive to controlling the total weight of the liquid cooling plate and realizing the lightweight design of the liquid cooling plate.

[0027] The advantages of the battery pack box, power battery pack and vehicle are the same as those of the above-mentioned liquid cooling plate over the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0029] Figure 1 It is a schematic diagram of a liquid cooling plate according to an embodiment of the utility model;

[0030] Figure 2 It is a schematic diagram of the liquid cooling plate body according to an embodiment of the utility model;

[0031] Figure 3 It is a schematic diagram of a liquid cooling plate composite plate according to an embodiment of the utility model;

[0032] Figure 4 A schematic diagram of a battery pack box according to an embodiment of the present utility model;

[0033] Figure 5 A side view of a battery pack box according to an embodiment of the present utility model;

[0034] Figure 6 It is a partial enlarged view of a battery pack box according to an embodiment of the utility model;

[0035] Figure 7It is a partial enlarged view of another battery pack box according to an embodiment of the utility model;

[0036] Figure 8 A schematic diagram of a pipe joint connection portion according to an embodiment of the utility model;

[0037] Fig. 9 This is a schematic diagram of another pipe joint connection portion described in an embodiment of the utility model.

[0038] Description of reference numerals:

[0039] 1-liquid cooling plate, 11-body, 12-composite plate, 111-cold plate upper plate, 112-cold plate lower plate, 121-composite material upper plate, 122-composite material lower plate, 123-foam layer, 13-flow channel, 14-pipe joint, 15-groove structure, 16-installation part, 2-frame. DETAILED DESCRIPTION

[0040] It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict. The described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] The terms "first", "second", etc. in the specification and claims of the present utility model are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the utility model can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0042] It should be understood that the reference to "one embodiment" throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the utility model. Therefore, the "in one embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0044] Reference Figures 1 to 3The utility model provides a liquid cooling plate 1, comprising a main body 11 and a composite plate 12; the main body 11 and the composite plate 12 are stacked and formed as an integral structure, wherein a flow channel 13 for circulating cooling liquid is provided in the main body 11.

[0045] Specifically, in practical applications, the liquid cooling plate 1 of the utility model can be placed at the bottom of the battery pack box so that the liquid cooling plate 1 is in full contact with the surface of the battery cell, which can effectively cool the battery cell and provide some support for the battery cell. The liquid cooling plate 1 includes a body 11 and a composite plate 12. Figure 1 FIG. 1 shows a schematic diagram of the appearance of the liquid cooling plate 1 in this embodiment. Figure 2 1 shows a schematic diagram of the structure of the body 11 in this embodiment, Figure 3 The schematic diagram of the structure of the composite plate 12 in this embodiment is shown. The main body 11 and the composite plate 12 are stacked. The main body 11 is provided with a flow channel 13 for circulating the coolant. The flow of the coolant in the flow channel 13 can realize the cooling of the battery cell. In practical applications, the battery cell will generate a lot of heat during the charging and discharging process, resulting in an increase in the ambient temperature in the battery pack. Excessive ambient temperature is likely to affect the normal operation of the battery cell, and even cause the risk of thermal runaway in the battery pack. The coolant circulating in the flow channel 13 can absorb part of the heat generated by the battery cell during the charging and discharging process of the battery cell, thereby reducing the ambient temperature in the battery pack, ensuring the normal operation of the battery cell, and protecting the safety of the battery pack. The composite plate 12 is processed from a composite material. The composite material is an optimized combination of material components of different properties. The composite material not only maintains the advantages of the performance of each component material, but also can obtain comprehensive performance that cannot be achieved by a single component material through the complementarity and association of the performance of each component. The matrix material of the composite material includes two categories: metal and non-metal. Common metal matrices include aluminum, magnesium, copper, titanium and their alloys, and common non-metal matrices include synthetic resins, rubber, ceramics, graphite, carbon, etc. In addition, composite materials usually have reinforcing materials, such as glass fiber, carbon fiber, boron fiber, silicon carbide fiber, asbestos fiber, etc. Composite materials have a small specific gravity, high specific strength and specific modulus, and are usually used to improve the strength, rigidity or thermal insulation of the board.

[0046] The body 11 and the composite plate 12 of the liquid cooling plate 1 are an integral structure. The body 11 and the composite plate 12 can be connected to each other through a closed mold molding process based on composite materials. The body 11 and the composite plate 12 are placed in the same mold cavity for molding. The mold cavity is formed by connecting two or more molds. The closed mold molding process includes SMC (Sheet Molding Compound) molding process, BMC (Bulk Molding Compound) molding process, RTM (Resin Transfer Molding) molding process, etc. Among them, the SMC molding process is to add a certain amount of powdered, granular or fibrous plastic into a preheated mold, and solidify and mold after closed mold pressurization and heating. The BMC molding process is to add a certain amount of lump plastic into a preheated mold, and solidify and mold after closed mold pressurization and heating. The RTM molding process is to pre-place a reinforcing material that is reasonably designed, cut or mechanized preformed in a designed mold, inject a certain amount of resin after closing the mold, and demold after the resin is solidified to obtain the final product.

[0047] In the prior art, the liquid cooling plate 1 is usually an aluminum plate, which has low strength and rigidity, and can withstand a small pressure range of external loads. When the liquid cooling plate 1 is placed at the bottom of the battery pack box, it is subjected to the pressure of multiple battery cells in the battery pack box, which may cause deformation and damage of the liquid cooling plate 1, resulting in damage to the flow channel 13 structure in the liquid cooling plate 1, and the cooling liquid cannot flow normally. In addition, the single aluminum plate structure has poor thermal insulation ability. Since the heat generated by the battery cells during the charging and discharging process is high, when the liquid cooling plate 1 acts as the bottom plate of the battery pack box, the liquid cooling plate 1 with poor thermal insulation performance is not convenient for people to touch or carry the battery pack from the outside, which may cause burns to people. The liquid cooling plate 1 of the utility model is composed of a body 11 and a composite plate 12. It is no longer a single aluminum plate. Its strength and rigidity performance are greatly improved, and the pressure range of the external load that can be borne is also greatly improved. When the liquid cooling plate 1 is placed at the bottom of the battery pack box, it can effectively support multiple battery cells, and it is not easy to cause damage to the flow channel 13 in the liquid cooling plate 1, thereby ensuring the normal operation of the liquid cooling plate 1. At the same time, the thermal insulation performance of the liquid cooling plate 1 of the composite structure is improved, so that the internal temperature of the battery pack box will not affect the touch or transportation of the battery pack from the outside, thereby greatly facilitating the use of the battery pack.

[0048] Further, see Figure 3 The composite panel 12 includes a composite upper panel 121 and a composite lower panel 122 ; the composite upper panel 121 and the composite lower panel 122 are connected to each other, wherein the composite upper panel 121 is located on a side close to the body 11 .

[0049] Specifically, the composite plate 12 is composed of two plates, namely a composite upper plate 121 and a composite lower plate 122. The composite upper plate 121 is located on the side close to the main body 11, that is, the levels of the liquid cooling plate 1 are the main body 11, the composite upper plate 121, and the composite lower plate 122. The composite upper plate 121 and the composite lower plate 122 are interconnected. In a preferred embodiment, the composite upper plate 121 and the composite lower plate 122 of the utility model can be processed from materials such as a resin matrix and glass fiber, and are interconnected through a closed mold molding process. Resin is an organic polymer that has a softening or melting range after being heated, has a tendency to flow under the action of external force when softened, and is solid, semi-solid or liquid at room temperature. Glass fiber is a high temperature resistant and high strength material. Adding glass fiber to the composite plate 12 can significantly improve the heat resistance, strength and stiffness of the composite plate 12. When the composite upper plate 121 and the composite lower plate 122 are made of materials such as a resin matrix and glass fiber, the composite upper plate 121 and the composite lower plate 122 can be connected to each other by using an RTM molding process.

[0050] Further, see Figure 3 The composite upper plate 121 is provided with a groove structure 15 , and the groove structure 15 has the same layout shape and corresponding layout position as the flow channel 13 .

[0051] Specifically, the flow channel 13 in the main body 11 is usually formed by a stamping process. After the processing is completed, the surface of the main body 11 close to the composite upper plate 121 has an uneven structure, and the shape of the structure is the same as the shape of the flow channel 13. Correspondingly, a groove structure 15 is provided on the composite upper plate 121. The shape of the groove structure 15 is the same as the shape of the flow channel 13 in the main body 11, and the layout position is also the same as the layout position of the flow channel 13 in the main body 11, so that the groove structure 15 can fully cooperate with the uneven structure of the surface of the main body 11, thereby avoiding the formation of a gap between the main body 11 and the composite upper plate 121, which affects the sealing of the liquid cooling plate 1.

[0052] Further, see Figure 3 The composite board 12 further includes a foam layer 123 , and the foam layer 123 is filled between the composite upper board 121 and the composite lower board 122 .

[0053] Specifically, the composite board 12 also includes a foam layer 123. The foam layer 123 has the characteristics of low density, light weight, high specific strength, buffering and shock absorption, sound insulation and sound absorption, etc. It is filled between the composite upper plate 121 and the composite lower plate 122, which can make the composite board 12 have better comprehensive performance. In practical applications, it is necessary to stack the composite upper plate 121, the foam layer 123 and the composite lower plate 122. After the composite upper plate 121 and the composite lower plate 122 are connected by the RTM molding process, the foam layer 123 can be fixed between the composite upper plate 121 and the composite lower plate 122. Of course, in order to avoid the foam layer 123 from being offset, the foam layer 123 can also be pre-bonded to the composite upper plate 121 or the composite lower plate 122 to achieve pre-fixation of the foam layer 123. The foam layer 123 can be any type of foam layer 123 such as polyurethane foam, epoxy resin foam, microporous polypropylene foam, etc., which is not limited in this embodiment.

[0054] Further, see Figure 2 The main body 11 includes a cold plate upper plate 111 and a cold plate lower plate 112; the cold plate upper plate 111 is connected to the cold plate lower plate 112, wherein the cold plate lower plate 112 is provided with the flow channel 13, and the cold plate upper plate 111 is provided with a pipe joint 14, and the pipe joint 14 is used to connect the flow channel 13 with an external pipeline.

[0055] Specifically, the body 11 is composed of two plates, namely, the upper plate 111 of the cold plate and the lower plate 112 of the cold plate. The upper plate 111 of the cold plate and the lower plate 112 of the cold plate are both hard metal plates or alloy plates, which can be fixedly connected by a brazing process or a fastener assembly process. In order to ensure the reliability of the connection, the present embodiment preferably realizes the fixed connection between the upper plate 111 of the cold plate and the lower plate 112 of the cold plate by a brazing process. The lower plate 112 of the cold plate is processed by a stamping process to form a flow channel 13 structure. After the brazing of the upper plate 111 of the cold plate and the lower plate 112 of the cold plate is completed, a closed flow channel 13 is formed. A pipe joint 14 is provided on the upper plate 111 of the cold plate. The pipe joint 14 and the upper plate 111 of the cold plate can be detachably connected together by fasteners such as bolts and screws, or can be welded together. The pipe joint 14 is used to be plugged with the plug-in end of the external pipeline, so as to realize the communication between the external pipeline and the flow channel 13 in the body 11. When the external pipeline is connected with the flow channel 13, the circulation of the coolant in the flow channel 13 can be realized.

[0056] Furthermore, the cold plate upper plate 111 is an aluminum plate, and the cold plate lower plate 112 is a steel plate.

[0057] Specifically, in the embodiment of the utility model, the upper plate 111 of the cold plate is made of aluminum plate, and the lower plate 112 of the cold plate is made of steel plate. The aluminum plate is light in weight and low in cost, while the steel plate has good strength and stiffness performance. The main body 11 is brazed by the aluminum plate and the steel plate, which can not only ensure the structural strength and stiffness of the liquid cooling plate 1, but also control the weight and processing cost of the liquid cooling plate 1.

[0058] Reference Figure 4 The utility model also provides a battery pack box, comprising a frame 2 and the liquid cooling plate 1 described in any of the aforementioned embodiments; the frame 2 is arranged around the liquid cooling plate 1, and together with the liquid cooling plate 1 defines a receiving cavity for receiving a battery cell.

[0059] Specifically, the frame 2 is a hard frame 2 surrounded by metal or alloy side beams. The frame 2 is arranged around the liquid cooling plate 1. The frame 2 is fixedly connected to the liquid cooling plate 1. The two together define a receiving cavity for accommodating battery cells. The liquid cooling plate 1 acts as the bottom plate of the receiving cavity. The battery cells are placed in the receiving cavity. The liquid cooling plate 1 supports the battery cells. Of course, the coolant circulating in the flow channel 13 of the liquid cooling plate 1 also cools the battery cells to ensure the safety of the battery cells. In addition to the frame 2 and the liquid cooling plate 1, the battery pack box also includes a cover plate. The cover plate is arranged on the side of the frame 2 away from the liquid cooling plate 1 and is fixedly connected to the frame 2. The cover plate is used to cover the receiving cavity, thereby protecting the battery cells in the receiving cavity and preventing dust, water vapor, etc. from entering the frame 2 to cause a short circuit of the battery cells. It should be noted that the connection between the liquid cooling plate 1 and the frame 2 and the connection between the cover plate and the frame 2 can be achieved by laser welding, blind riveting, bolt connection, etc. The specific connection method is not limited in this embodiment.

[0060] In the prior art, due to the poor strength and rigidity of the liquid cooling plate 1, in order to ensure that the liquid cooling plate 1 can reliably support the battery cell, it is usually necessary to additionally provide a bottom guard plate under the liquid cooling plate 1. The bottom guard plate is also fixedly connected to the frame 2 by any means such as laser welding, core riveting, bolt connection, etc. The provision of the bottom guard plate increases the overall weight of the battery pack case, and at the same time, it reduces the production efficiency and increases the production cost of the battery pack case. The battery pack case of the utility model uses the liquid cooling plate 1 in the aforementioned embodiment as the bottom plate. The liquid cooling plate 1 has good strength and rigidity properties, and the use of the bottom guard plate in the prior art can be omitted, thereby reducing the types and number of components required for the battery pack case, which helps to reduce the overall weight of the battery pack case. At the same time, the process of fixing the bottom guard plate to the frame 2 is omitted, which can save the processing time of the battery pack case to a certain extent, and helps to improve the production efficiency of the battery pack case and control the production cost.

[0061] Further, see Figures 5 to 9The frame 2 is an aluminum frame or a rolled steel frame. The body 11 includes a cold plate upper plate 111 and a cold plate lower plate 112. The cold plate upper plate 111 is an aluminum plate, and the cold plate lower plate 112 is a steel plate. The aluminum frame is fixedly connected to the cold plate upper plate 111, or the rolled steel frame is fixedly connected to the cold plate lower plate 112.

[0062] Specifically, in some embodiments, the frame 2 is made of aluminum and its alloys. In combination with the above embodiments, since the upper plate 111 of the cold plate is an aluminum plate, Figure 6 As shown, the cold plate upper plate 111 is welded to the frame 2, and the material of the cold plate upper plate 111 is the same as that of the frame 2, so the success rate and reliability of welding are higher. If it is assumed that the cold plate upper plate 111 is located closer to the frame 2 among the cold plate lower plate 112, in some preferred embodiments, the area of ​​the cold plate upper plate 111 can be set to be larger than the area of ​​the cold plate lower plate 112, so that the contact area between the cold plate upper plate 111 and the frame 2 is larger, thereby ensuring the reliability of welding, and at the same time helping to control the overall total amount and cost of the liquid cooling plate 1, and avoiding waste of resources. Specifically, the edge of the cold plate upper plate 111 extends toward the direction of the aluminum frame to form a first connecting portion, and the cold plate upper plate 111 is fixedly connected to the aluminum frame through the first connecting portion. In addition, when both the cold plate upper plate 111 and the frame 2 are made of aluminum, the first connection portion of the cold plate upper plate 111 can be welded to the frame 2 by using a friction stir welding process. The friction stir welding process refers to using the heat generated by the friction between the high-speed rotating welding tool and the workpiece to partially plasticize the welded material. When the welding tool moves forward along the welding interface, the plasticized material flows from the front to the rear of the welding tool under the action of the rotating friction force of the welding tool, and forms a dense solid phase weld under the extrusion of the welding tool. It is often used for welding materials such as magnesium and aluminum. The cold plate upper plate 111 and the frame 2 welded by the friction stir welding process have a fine microstructure and fine grains. There is no spatter and smoke during the welding process, and no defects such as cracks and pores are generated, and there is no need to add welding wire and shielding gas.

[0063] In other embodiments, the frame 2 is made of rolled steel. In combination with the above embodiments, since the cold plate lower plate 112 is a steel plate, Figure 7As shown, the cold plate lower plate 112 is welded to the frame 2. The material of the cold plate lower plate 112 is the same as that of the frame 2, and the success rate and reliability of welding are higher. If it is assumed that the cold plate lower plate 112 is located farther away from the frame 2 among the cold plate upper plate 111 and the cold plate lower plate 112, then in order to ensure the successful welding of the cold plate lower plate 112 and the frame 2, it is necessary to set the area of ​​the cold plate lower plate 112 to be larger than the area of ​​the cold plate upper plate 111, so that the edge of the cold plate lower plate 112 can fully contact the surface of the frame 2 to ensure the reliability of welding. Specifically, the edge of the cold plate lower plate 112 extends toward the direction of the rolled steel frame to form a second connecting portion, and the cold plate lower plate 112 is fixedly connected to the rolled steel frame through the second connecting portion. In addition, when the cold plate lower plate 112 and the frame 2 are both made of steel, the second connecting portion of the cold plate lower plate 112 can be welded to the frame 2 using a carbon dioxide gas shielded welding process. Carbon dioxide gas shielded welding is a welding method that uses carbon dioxide gas as a shielding gas. The welding method is simple, the welding cost is low, and the efficiency is high, which helps to improve the production efficiency of the battery pack case and control the production cost of the battery pack case.

[0064] In summary, in practical applications, if one wants to control the overall weight of the battery pack case and realize a lightweight design of the battery pack case, an aluminum alloy frame 2 can be selected, and the battery pack case can be formed by welding the cold plate upper plate 111 to the frame 2; if one wants to control the production cost of the battery pack case and ensure the structural strength and rigidity of the battery pack case, a rolled steel frame 2 can be selected, and the battery pack case can be formed by welding the cold plate lower plate 112 to the frame 2.

[0065] In the embodiment where the cold plate upper plate 111 is welded to the frame 2, as shown in FIG. Figure 8 As shown, at least part of the edge of the upper plate 111 of the cold plate can be arranged to protrude from the outer wall of the frame 2 to form a mounting portion 16. The size of the mounting portion 16 is determined according to the size of the pipe joint 14. The mounting portion 16 can be any shape such as a protruding rectangular structure, a fan-shaped structure, a prismatic structure, etc. The specific form is not limited in this embodiment. The pipe joint 14 is arranged on the mounting portion 16 and connected to the upper plate 111 of the cold plate. In this embodiment, the pipe joint 14 is entirely located outside the frame 2, which is convenient for plugging with the plug-in end of the external pipeline. If the coolant leaks at the pipe joint 14, the coolant will also leak to the outside of the frame 2, which will not pollute or affect the battery cells in the frame 2, and will help to improve the safety of the power battery pack.

[0066] In the embodiment where the cold plate lower plate 112 is welded to the frame 2, as shown in FIG. Fig. 9As shown, since the lower plate 112 of the cold plate is located further away from the frame 2, the pipe joint 14 can only be set in the frame 2. In this case, the interface part of the pipe joint 14 passes through the frame 2 and is exposed outside the frame 2, so as to facilitate the connection of the plug-in end of the external pipeline. Exemplarily, a through hole is provided on the frame 2, and the interface part of the pipe joint 14 passes through the through hole and is exposed outside the frame 2, and is used to be plugged with the plug-in end of the external pipeline. In this embodiment, most of the pipe joint 14 is located in the frame 2, and a small part is located outside the frame 2. The frame 2 can play a certain protective role on the pipe joint 14, avoid corrosion at the pipe joint 14, etc., which helps to extend the service life of the pipe joint 14.

[0067] The utility model further provides a power battery pack, comprising a plurality of battery cells and a battery pack box according to any one of the aforementioned embodiments, wherein the plurality of battery cells are arranged in the accommodating cavity.

[0068] Specifically, multiple battery cells can be connected in series or in parallel to form a charge and discharge unit of a power battery pack, which determines the charge and discharge performance of the power battery pack. Multiple battery cells are arranged in the accommodating cavity of the battery pack box, and the liquid cooling plate 1 supports multiple battery cells. The power battery pack of the utility model adopts the battery pack box of the aforementioned embodiment, which helps to improve the strength and rigidity of the entire battery pack, and at the same time helps to achieve a lightweight design of the battery pack and control the production cost of the battery pack.

[0069] The utility model also provides a vehicle, comprising the power battery pack of the aforementioned embodiment.

[0070] Specifically, the vehicle includes the power battery pack of any one of the aforementioned embodiments. The power battery pack has a lighter overall weight and lower production cost, thereby helping to reduce the weight of the entire vehicle and control the cost of the entire vehicle.

[0071] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A liquid cooling plate (1), characterized in that: It comprises a body (11) and a composite plate (12); The body (11) and the composite plate (12) are stacked and are an integral structure, wherein a flow channel (13) for circulating a cooling liquid is provided in the body (11); Wherein, the composite plate (12) comprises a composite material upper plate (121) and a composite material lower plate (122); The composite upper plate (121) and the composite lower plate (122) are connected to each other, and the composite upper plate (121) is located on a side close to the body (11); a groove structure (15) is provided on the composite upper plate (121), and the groove structure (15) has the same layout shape and corresponding layout position as the flow channel (13).

2. The liquid cooling plate (1) according to claim 1, characterized in that: The composite plate (12) further comprises a foam layer (123), wherein the foam layer (123) is filled between the composite material upper plate (121) and the composite material lower plate (122).

3. The liquid cooling plate (1) according to claim 1, characterized in that: The body (11) comprises a cold plate upper plate (111) and a cold plate lower plate (112); The cold plate upper plate (111) is connected to the cold plate lower plate (112), wherein the cold plate lower plate (112) is provided with the flow channel (13), and the cold plate upper plate (111) is provided with a pipe joint (14), and the pipe joint (14) is used to connect the flow channel (13) with an external pipeline.

4. The liquid cooling plate (1) according to claim 3, characterized in that: The cold plate upper plate (111) is an aluminum plate, and the cold plate lower plate (112) is a steel plate.

5. A battery pack box, characterized in that: Comprising a frame (2) and a liquid cooling plate (1) according to any one of claims 1 to 4; The frame (2) is arranged around the circumference of the liquid cooling plate (1), and together with the liquid cooling plate (1) defines a receiving cavity for receiving a battery cell.

6. The battery pack case according to claim 5, characterized in that: The frame (2) is an aluminum frame or a rolled steel frame.

7. The battery pack case according to claim 6, characterized in that: The body (11) comprises a cold plate upper plate (111) and a cold plate lower plate (112), the cold plate upper plate (111) is an aluminum plate, and the cold plate lower plate (112) is a steel plate; The aluminum frame is fixedly connected to the cold plate upper plate (111), or the rolled steel frame is fixedly connected to the cold plate lower plate (112).

8. The battery pack case according to claim 7, characterized in that: The area of ​​the upper plate (111) of the cold plate is greater than the area of ​​the lower plate (112) of the cold plate; The edge of the upper plate (111) of the cold plate extends towards the aluminum frame to form a first connecting portion, and the first connecting portion is fixedly connected to the aluminum frame.

9. The battery pack case according to claim 7, characterized in that: The area of ​​the upper plate (111) of the cold plate is smaller than the area of ​​the lower plate (112) of the cold plate; The edge of the cold plate lower plate (112) extends toward the rolled steel frame to form a second connection portion, and the second connection portion is fixedly connected to the rolled steel frame.

10. The battery pack case according to claim 7, characterized in that: The cold plate upper plate (111) is provided with a pipe joint (14), and the pipe joint (14) is used to connect the flow channel (13) with an external pipeline; The pipe joint (14) is arranged outside the frame (2); or, the pipe joint (14) is arranged inside the frame (2), and an interface portion of the pipe joint (14) passes through the frame (2) and is exposed outside the frame (2).

11. A power battery pack, characterized in that: It comprises a plurality of battery cells and a battery pack case as claimed in any one of claims 5 to 10, wherein the plurality of battery cells are arranged in the accommodating cavity.

12. A vehicle, characterized in that: Including the power battery pack as described in claim 11.

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