Battery pack and liquid cooling box body thereof

Abstract

The utility model provides a battery pack and a liquid cooling box body thereof, and relates to the technical field of battery packs. The liquid cooling box body of the battery pack comprises a liquid cooling upper cover which comprises a liquid cooling upper plate and a liquid cooling lower plate which are stacked up and down and connected with each other, and the liquid cooling upper plate and the liquid cooling lower plate jointly define a liquid flow channel; and the main shell is connected with the liquid cooling upper cover, the main shell and the liquid cooling upper cover jointly define a containing cavity, and the containing cavity is used for containing the battery module. According to the liquid cooling box body of the battery pack, the liquid cooling system is integrated on the liquid cooling upper cover, the structure is simple, assembly and disassembly are convenient, the development cost of the battery pack can be reduced, the space utilization rate of the battery pack is high, and the energy density of the battery pack can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery packs, and in particular to a battery pack and a liquid cooling box thereof. Background Art

[0002] Liquid cooling and liquid heating system is an indispensable functional module in the development of power battery packs. For battery packs with different system battery modules, the following liquid cooling and liquid heating system forms are currently widely used: serpentine tube liquid cooling system, extruded profile liquid cooling system, and stamping liquid cooling system. Among them, stamping liquid cooling system is more widely used.

[0003] The stamped liquid cooling system uses a stamped liquid cooling plate with a coolant flow channel formed inside the liquid cooling plate. At present, the liquid cooling plate is mostly arranged at the bottom of the battery module and stacked on the inner bottom wall of the box, which will occupy the installation space of the battery module. In addition, the installation method of the stamped liquid cooling plate mostly uses the flow drill screw (FDS) process to connect the liquid cooling plate to the box. The installation process is relatively cumbersome and costly, and it is not easy to disassemble and replace. Utility Model Content

[0004] The present application provides a battery pack and a liquid cooling box thereof. The liquid cooling upper cover of the liquid cooling box is integrated with a liquid cooling system, has a simple structure, is easy to assemble and disassemble, can reduce development costs, has high space utilization of the battery pack, and is conducive to improving the energy density of the battery pack.

[0005] One aspect of the present application provides a liquid cooling box for a battery pack, comprising:

[0006] The liquid-cooled upper cover comprises a liquid-cooled upper plate and a liquid-cooled lower plate which are stacked and connected to each other, and the liquid-cooled upper plate and the liquid-cooled lower plate together form a liquid flow channel;

[0007] The main shell is connected to the liquid cooling cover, and the main shell and the liquid cooling cover together form a containing cavity, which is used to contain the battery module.

[0008] In a possible implementation, at least one of the liquid-cooled upper plate and the liquid-cooled lower plate has a stamped groove.

[0009] In a possible implementation, the liquid-cooled upper plate has a stamped groove, and the edge of the liquid-cooled upper plate is provided with a flange;

[0010] And / or, the liquid-cooled lower plate has a stamped groove, and the edge of the liquid-cooled lower plate is provided with a flange.

[0011] In a possible implementation, the liquid-cooled upper plate has a stamped groove, and the liquid-cooled lower plate is a flat plate.

[0012] In a possible implementation, the thickness of the liquid-cooled upper plate is 1.5 mm-2.0 mm, and the thickness of the liquid-cooled lower plate is 1.0 mm-1.5 mm.

[0013] In a possible implementation manner, the liquid-cooled upper cover further includes:

[0014] The protective layer covers the surface of the liquid-cooled upper plate on one side facing away from the liquid-cooled lower plate.

[0015] In a possible implementation manner, the liquid-cooled upper cover further includes:

[0016] The fireproof layer is arranged on the surface of the liquid-cooled lower plate on one side away from the liquid-cooled upper plate, and the fireproof layer at least covers the area where the battery module is located.

[0017] In a possible implementation manner, the liquid cooling upper cover and the main housing are connected by bolts.

[0018] Another aspect of the present application provides a battery pack, comprising a battery module and the liquid cooling box as described above, wherein the battery module is disposed in a receiving cavity of the liquid cooling box.

[0019] In a possible implementation, an aerogel layer is provided between the liquid cooling upper cover of the liquid cooling box and the battery module.

[0020] The battery pack and its liquid cooling box provided by the present application, the liquid cooling box of the battery pack includes a liquid cooling upper cover and a main shell body, the liquid cooling upper cover is connected to the top of the main shell body, and the two together form a housing cavity for accommodating the battery module. The liquid cooling upper cover is formed by stacking a liquid cooling upper plate and a liquid cooling lower plate up and down, and the liquid cooling upper plate and the liquid cooling lower plate together form a liquid flow channel, and the liquid cooling system is integrated on the liquid cooling upper cover to cool or heat the battery module through the liquid cooling upper cover. With such an arrangement, there is no need to set up a separate liquid cooling plate, which reduces the weight of the battery pack and meets the lightweight design requirements. In addition, the repeated development of the battery pack cover is omitted, which can reduce the development cost of the battery pack. In addition, the internal space of the liquid cooling box can be increased, and the installation space of the battery module is larger, which is conducive to improving the energy density of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A three-dimensional structural diagram of a battery pack provided in an embodiment of the present application;

[0023] Figure 2 for Figure 1 The exploded structure diagram of the battery pack in the

[0024] Figure 3 for Figure 1 The cross-sectional structure diagram of the battery pack along the AA line;

[0025] Figure 4 for Figure 1 A top view of the battery pack in FIG.

[0026] Figure 5 A schematic diagram of the structure of the liquid cooling cover provided in an embodiment of the present application;

[0027] Figure 6 This is a diagram of the exploded structure of the liquid-cooled top cover provided in an embodiment of the present application.

[0028] Description of reference numerals:

[0029] 10-Battery pack;

[0030] 100-liquid cooling box;

[0031] 110-liquid cooling cover; 120-main housing;

[0032] 111-liquid cooling upper plate; 112-liquid cooling lower plate; 113-protective layer; 114-fireproof layer;

[0033] 1101-liquid flow channel; 1102-stamping groove; 1103-flanging; 1111-liquid inlet; 1112-liquid outlet;

[0034] 200-battery module;

[0035] 300-aerogel layer. DETAILED DESCRIPTION

[0036] As described in the background technology, three types of liquid cooling systems are widely used in battery pack development: serpentine tube liquid cooling system, extruded profile liquid cooling system, and stamping liquid cooling system. Among them, the stamping liquid cooling system is the most widely used, and the stamping liquid cooling plate is used to cool or heat the battery modules in the battery pack.

[0037] In the related art, the liquid cooling plate is usually arranged at the bottom of the battery module and supported on the inner bottom wall of the battery pack box. The weight of the box plus the weight of the liquid cooling plate makes the battery pack heavy, which is not conducive to the lightweight design of the battery pack. Moreover, in the development process of the battery pack, it is necessary to design and develop the box and the liquid cooling plate, resulting in a high development cost of the battery pack. In addition, since the liquid cooling plate occupies the internal space of the box, it will encroach on the installation space of the battery module. As a result, the installation space of the battery module is smaller, which limits the energy density of the battery pack.

[0038] In view of this, an embodiment of the present application provides a battery pack and a liquid-cooled box body thereof. The liquid-cooled box body of the battery pack includes a liquid-cooled upper cover and a main shell body. The liquid-cooled upper cover is connected to the top of the main shell body, and the two together form a housing cavity for accommodating the battery module. The liquid-cooled upper cover is formed by stacking a liquid-cooled upper plate and a liquid-cooled lower plate up and down. The liquid-cooled upper plate and the liquid-cooled lower plate together form a liquid flow channel. The liquid cooling system is integrated on the liquid-cooled upper cover to cool or heat the battery module through the liquid-cooled upper cover. With such an arrangement, there is no need to set up a separate liquid cooling plate, which reduces the weight of the battery pack and meets the lightweight design requirements. In addition, the repeated development of the battery pack cover is eliminated, which can reduce the development cost of the battery pack. In addition, the internal space of the liquid-cooled box body can be increased, and the installation space of the battery module is larger, which is beneficial to improving the energy density of the battery pack.

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] Figure 1 This is a three-dimensional structural diagram of a battery pack provided in an embodiment of the present application. Figure 1 As shown, the embodiment of the present application provides a battery pack 10, which can be used in new energy vehicles, for example, the battery pack 10 is used in pure electric vehicles or hybrid vehicles. Alternatively, the battery pack 10 can also be used in other fields such as solar / wind power storage systems, power grid / electric power supply systems, base station battery power supplies, electric robots, etc.

[0041] Figure 2 for Figure 1 Exploded structure diagram of the battery pack in Figure 1. Figure 3 for Figure 1 The cross-sectional structure of the battery pack along the AA line. Figure 2 and Figure 3 As shown, the battery pack 10 may include a liquid cooling box 100 and a battery module 200. The liquid cooling box 100 has a receiving cavity, and the battery module 200 is arranged in the receiving cavity. The liquid cooling box 100 is the main support structure of the battery pack 10, which is used to support and fix the battery module 200, and provide protection for the battery module 200 located in its receiving cavity to ensure the reliability of the battery pack 10. The battery module 200 can convert chemical energy into electrical energy to provide current to electrical equipment.

[0042] A plurality of battery modules 200 may be disposed in the accommodating cavity of the liquid cooling box 100 . The plurality of battery modules 200 may be arranged in an array in the accommodating cavity, for example, to meet the requirements of the battery pack 10 for the capacity and power of the battery modules 200 .

[0043] The liquid-cooled housing 100 may include a liquid-cooled upper cover 110 and a main shell 120. The liquid-cooled upper cover 110 is mounted on the main shell 120, and the liquid-cooled upper cover 110 and the main shell 120 together form a receiving cavity. The main shell 120 may include a bottom wall and side walls surrounding the bottom wall, and the side walls may be perpendicular to the bottom wall, for example. The liquid-cooled upper cover 110 is mounted on the opening surrounded by the side walls of the main shell 120, and the liquid-cooled upper cover 110 may be connected to the side walls of the main shell 120 to form an installation space for the battery module 200 between the liquid-cooled upper cover 110 and the bottom wall of the main shell 120.

[0044] The main housing 120 may be an integrally formed structure, or the main housing 120 may be formed by connecting a plurality of parts. For example, the main housing 120 may be made of aluminum to ensure the structural strength of the main housing 120 and meet the reliability requirements of the main housing 120. In addition, the main housing 120 is relatively light in weight, which can meet the lightweight design requirements of the battery pack 10.

[0045] In this embodiment, the liquid-cooled upper cover 110 serves as the upper cover of the liquid-cooled box 100, and together with the main shell 120, protects the battery module 200 to achieve the overall protection function of the liquid-cooled box 100. On this basis, the liquid-cooled upper cover 110 can also serve as the liquid cooling system of the battery pack 10, and a liquid flow channel 1101 for liquid (such as coolant) to flow through is formed inside the liquid-cooled upper cover 110. The temperature of the battery module 200 can be adjusted through the liquid-cooled upper cover 110, for example, the battery module 200 is cooled or heated, so that the battery module 200 maintains a stable and suitable operating temperature.

[0046] By integrating the liquid cooling system of the battery pack 10 on the liquid cooling cover 110, the liquid cooling cover 110 can not only protect the structure of the liquid cooling box 100, but also adjust the temperature of the battery module 200. In this way, the battery pack 10 does not need to be equipped with a separate liquid cooling plate, which saves the weight of the liquid cooling plate, and can reduce the overall weight of the battery pack 10, which is conducive to the lightweight design of the battery pack 10.

[0047] Furthermore, in the process of developing and producing the battery pack 10, a plate-like structure with a liquid flow channel 1101 can be designed and processed as the liquid cooling cover 110, without the need to design an additional cover that only has a structural protection function. In this way, repeated development of the cover of the battery pack 10 is omitted, and the development cost of the battery pack 10 can be reduced.

[0048] In addition, since the liquid-cooled box 100 relies on its own liquid-cooled upper cover 110 to realize the function of the liquid cooling system, there is no need to additionally set a liquid cooling plate in the accommodating chamber of the liquid-cooled box 100. In this way, the space in the accommodating chamber of the liquid-cooled box 100 can be fully utilized, which is equivalent to increasing the internal space of the liquid-cooled box 100, increasing the installation space of the battery module 200, and providing a larger height space for installing the battery module 200. In this way, a larger number of battery modules 200 can be arranged in the accommodating chamber of the liquid-cooled box 100, or the volume of a single battery module 200 can be larger. Thereby, it is beneficial to improve the energy density of the battery pack 10, increase the power of the battery pack 10, and enhance the working performance of the battery pack 10.

[0049] It should be noted that when the battery module 200 in the accommodating cavity of the liquid-cooling box 100 is inverted, the temperature of the battery module 200 is adjusted by setting a liquid-cooling upper cover 110. Since the liquid-cooling upper cover 110 is located above the battery module 200, the contact area between the liquid-cooling upper cover 110 and the inverted battery module 200 is larger, and the liquid-cooling upper cover 110 has higher cooling efficiency and better cooling effect on the battery module 200, which is beneficial to enhancing the temperature uniformity of the battery module 200 and improving the working performance of the battery module 200.

[0050] Reference Figure 3 As shown, as for the connection method between the liquid-cooled upper cover 110 and the main housing 120, in some embodiments, the liquid-cooled upper cover 110 and the main housing 120 can be connected by bolts, and nuts (such as rivet nuts) are arranged outside the bolts to lock the liquid-cooled upper cover 110 and the main housing 120 together. For example, the liquid-cooled upper cover 110 is locked on the side wall of the main housing 120 by bolts and nuts.

[0051] Such a configuration can ensure the connection strength between the liquid cooling cover 110 and the main housing 120 and the reliability of the liquid cooling box 100. In addition, the assembly and disassembly between the liquid cooling cover 110 and the main housing 120 are facilitated, and the assembly efficiency of the battery pack 10 can be improved.

[0052] Of course, the liquid cooling cover 110 and the main housing 120 may be connected in other ways, which are not specifically limited in the present embodiment. For example, the liquid cooling cover 110 and the main housing 120 may be connected by a flow drill screw process.

[0053] An aerogel layer 300 may also be provided between the liquid-cooled upper cover 110 and the battery module 200 located in the accommodating cavity of the liquid-cooled box 100. Through the bonding effect of the aerogel layer 300, the liquid-cooled upper cover 110 and the battery module 200 may be bonded and connected, thereby improving the stability and reliability of the liquid-cooled upper cover 110 and enhancing the integrity of the battery pack 10. In addition, the aerogel layer 300 has a large volume and a low density, and has good buffering properties, which helps to absorb the external force on the liquid-cooled upper cover 110, protect the battery module 200 from impact, and improve the reliability and safety of the battery pack 10.

[0054] In addition, since the density of aerogel is extremely low and the air content in aerogel is relatively high, aerogel has a very good heat insulation effect. In this regard, the aerogel layer 300 between the liquid-cooled upper cover 110 and the battery module 200 can only cover a partial area of ​​the liquid-cooled upper cover 110 to reserve sufficient space between the liquid-cooled upper cover 110 and the battery module 200 to ensure the temperature regulation effect of the liquid-cooled upper cover 110 on the battery module 200 and maintain the battery module 200 within a suitable temperature range.

[0055] For example, the aerogel layer 300 may only cool the edge area of ​​the liquid-cooled upper cover 110 , or the aerogel layer 300 may only cover the edge area of ​​each battery module 200 , and the aerogel layer 300 may bond the liquid-cooled upper cover 110 to the battery module 200 .

[0056] Figure 4 for Figure 1 A top view of the battery pack in Figure 1. Figure 5 This is a schematic diagram of the structure of the liquid cooling cover provided in the embodiment of the present application. Figure 4 or Figure 5 As shown, the liquid cooling cover 110 has a liquid flow channel 1101 inside, and the liquid flow channel 1101 is used for liquid (such as coolant) to flow. The liquid flowing through the liquid flow channel 1101 exchanges heat with the battery module 200 in the accommodating cavity of the liquid cooling box 100 to adjust the temperature of the battery module 200.

[0057] When the battery module 200 needs to be cooled, the liquid introduced into the liquid flow channel 1101 of the liquid cooling upper cover 110 may be a cooling liquid. The battery module 200 in the liquid cooling box 100 generates heat during operation, and the cooling liquid flowing in the liquid flow channel 1101 of the liquid cooling upper cover 110 exchanges heat with the heat generated by the battery module 200. The cooling liquid in the liquid flow channel 1101 heats up, and the battery module 200 cools down.

[0058] When the battery module 200 needs to be heated, the liquid introduced into the liquid flow channel 1101 of the liquid-cooled upper cover 110 may be a heating liquid. The heating liquid flows in the liquid flow channel 1101 of the liquid-cooled upper cover 110 to perform heat exchange with the battery module 200 in the liquid-cooled box 100. The heat of the heating liquid in the liquid-cooled upper cover 110 is released to the battery module 200, so that the heating liquid is cooled and the battery module 200 is heated.

[0059] In this embodiment, there is no limitation on the arrangement of the liquid flow channels 1101 in the liquid-cooled upper cover 110. The arrangement structure of the liquid flow channels 1101 can be reasonably set according to the specific structure of the battery pack 10 and the layout structure of the battery module 200 in the liquid-cooled box 100, so that the area where the battery module 200 is located is covered with liquid flow channels 1101 of sufficient density and area, ensuring the heat exchange effect between the liquid-cooled upper cover 110 and the battery module 200, and ensuring that the battery module 200 can be maintained within a suitable temperature range.

[0060] Reference Figure 5 As shown, the liquid cooling cover 110 is also provided with a liquid inlet 1111 and a liquid outlet 1112, both of which are connected to the liquid flow channel 1101 in the liquid cooling cover 110. The liquid enters the liquid flow channel 1101 from the liquid inlet 1111, circulates along the liquid flow, and then is discharged from the liquid outlet 1112.

[0061] Figure 6 This is a diagram of the exploded structure of the liquid cooling cover provided in the embodiment of the present application. Figure 6 As shown, the liquid-cooled upper cover 110 may include a liquid-cooled upper plate 111 and a liquid-cooled lower plate 112, which are stacked up and down, and the liquid-cooled upper plate 111 is located on the side of the liquid-cooled lower plate 112 away from the battery module 200. The liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 are connected to each other, and the two together form a liquid flow channel 1101 to achieve the flow of liquid in the liquid-cooled upper cover 110.

[0062] The liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 can be made of aluminum to ensure the structural strength of the liquid-cooled upper cover 110 and meet the reliability requirements of the liquid-cooled upper cover 110. In addition, the liquid-cooled upper cover 110 is light in weight and can meet the lightweight design requirements of the battery pack 10.

[0063] The liquid inlet 1111 and the liquid outlet 1112 on the liquid-cooled upper cover 110 may be arranged on the liquid-cooled upper plate 111, and the liquid inlet 1111 and the liquid outlet 1112 are both connected to the liquid flow channel 1101 inside the liquid-cooled upper cover 110. For example, the liquid inlet 1111 and the liquid outlet 1112 on the liquid-cooled upper plate 111 may extend to a side away from the liquid-cooled lower plate 112, and the liquid inlet 1111 and the liquid outlet 1112 may protrude on the liquid-cooled upper cover 110, so that the liquid inlet 1111 and the liquid outlet 1112 are connected to an external device.

[0064] Continue to refer to Figure 6 At least one of the liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 has a stamped groove 1102, that is, at least one of the liquid-cooled lower plate 112 and the liquid-cooled upper plate 111 has a groove structure formed by a stamping process. The notches of the stamped grooves 1102 formed on the liquid-cooled upper plate 111 or the liquid-cooled lower plate 112 can face each other, so that the liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 can jointly enclose the liquid flow channel 1101.

[0065] Specifically, the liquid-cooled upper plate 111 may have a stamping groove 1102, and the notch of the stamping groove 1102 of the liquid-cooled upper plate 111 faces the liquid-cooled lower plate 112. The liquid-cooled lower plate 112 may be a flat plate, or in other words, the liquid-cooled lower plate 112 is flat. The stamping groove 1102 on the liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 together form a liquid flow channel 1101.

[0066] Alternatively, the liquid-cooled lower plate 112 may have a stamping groove 1102, and the notch of the stamping groove 1102 of the liquid-cooled lower plate 112 faces the liquid-cooled upper plate 111. The liquid-cooled upper plate 111 may be a flat plate, or in other words, the liquid-cooled upper plate 111 is in a flat plate shape. The stamping groove 1102 on the liquid-cooled lower plate 112 and the liquid-cooled upper plate 111 together form a liquid flow channel 1101.

[0067] Alternatively, the liquid-cooled upper plate 111 may have a stamping groove 1102, and the notch of the stamping groove 1102 of the liquid-cooled upper plate 111 faces the liquid-cooled lower plate 112. The liquid-cooled lower plate 112 may also have a stamping groove 1102, and the notch of the stamping groove 1102 of the liquid-cooled lower plate 112 faces the liquid-cooled upper plate 111. The stamping groove 1102 on the liquid-cooled upper plate 111 and the stamping groove 1102 on the liquid-cooled lower plate 112 at least partially overlap, for example, the stamping groove 1102 on the liquid-cooled upper plate 111 and the stamping groove 1102 on the liquid-cooled lower plate 112 completely overlap, so that the stamping groove 1102 on the liquid-cooled upper plate 111 and the stamping groove 1102 on the liquid-cooled lower plate 112 are connected to each other, and the stamping groove 1102 on the liquid-cooled upper plate 111 and the stamping groove 1102 on the liquid-cooled lower plate 112 together form a liquid flow channel 1101.

[0068] Furthermore, the liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 are provided with the punched groove 1102, and the edges thereof may be provided with flanges 1103. In this way, the structural strength of the liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 provided with the punched groove 1102 can be increased, and its reliability and service life can be improved. Furthermore, the flanges 1103 can make the liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 fit more closely, enhance the sealing of the liquid-cooled upper cover 110, prevent foreign matter such as dust and water vapor from the outside from entering the liquid-cooled flow channel, and increase the protective function of the liquid-cooled upper cover 110.

[0069] When the stamping groove 1102 is provided on the liquid-cooled upper plate 111, the edge of the liquid-cooled upper plate 111 may be provided with a flange 1103. For example, the flange 1103 may be located on a side of the liquid-cooled upper plate 111 close to the liquid-cooled lower plate 112, and the flange 1103 of the liquid-cooled upper plate 111 is closely fitted to the liquid-cooled lower plate 112.

[0070] When the stamping groove 1102 is provided on the liquid-cooled lower plate 112, the edge of the liquid-cooled lower plate 112 may be provided with a flange 1103. For example, the flange 1103 may be located on a side of the liquid-cooled lower plate 112 close to the liquid-cooled upper plate 111, and the flange 1103 of the liquid-cooled lower plate 112 is closely fitted to the liquid-cooled upper plate 111.

[0071] When both the liquid-cooled upper plate 111 and the liquid-cooled lower plate 112 have the stamping groove 1102, the edge of the liquid-cooled upper plate 111 and the edge of the liquid-cooled lower plate 112 may be provided with flanges 1103. For example, the flange 1103 of the liquid-cooled upper plate 111 is located on a side thereof close to the liquid-cooled lower plate 112, and the flange 1103 of the liquid-cooled lower plate 112 is located on a side thereof close to the liquid-cooled upper plate 111, and the flange 1103 of the liquid-cooled upper plate 111 and the flange 1103 of the liquid-cooled lower plate 112 are closely fitted.

[0072] like Figure 6 As shown, as an embodiment, the stamping groove 1102 can be provided on the liquid-cooled upper plate 111, while the liquid-cooled lower plate 112 is a flat plate. In this way, the flatness of the liquid-cooled lower plate 112 is better, and the flatness of the surface of the liquid-cooled upper cover 110 facing the liquid-cooled box 100 is better, which is convenient for the contact between the liquid-cooled upper cover 110 and the battery module 200, and convenient for setting the aerogel layer 300 between the liquid-cooled upper cover 110 and the battery module 200. In addition, the force between the liquid-cooled upper cover 110 and the battery module 200 is more balanced, and it is not easy to cause the battery module 200 to produce a force concentration phenomenon, which helps to enhance the reliability of the battery module 200 and extend the service life of the battery module 200.

[0073] When the stamping groove 1102 is set on the liquid cooling upper plate 111, in order to improve the overall structural strength and rigidity of the liquid cooling upper plate 111 and ensure that the liquid cooling upper plate 111 meets the reliability requirements of the liquid cooling upper cover 110, the thickness of the liquid cooling upper plate 111 can be appropriately increased.

[0074] Specifically, the thickness of the liquid-cooled upper plate 111 can be 1.5 mm to 2.0 mm. In this way, the thickness of the liquid-cooled upper plate 111 can be ensured to be moderate, which can ensure the structural strength and rigidity of the liquid-cooled upper plate 111, and the liquid-cooled upper plate 111 can meet the reliability requirements. It also avoids the liquid-cooled upper plate 111 from being too thick, preventing the liquid-cooled upper plate 111 from affecting the overall thickness of the liquid-cooled upper cover 110, which is conducive to the thinness of the liquid-cooled upper cover 110 and meets the thinness requirements of the battery pack 10.

[0075] For example, the thickness of the liquid-cooled upper plate 111 is 1.55 mm, 1.60 mm, 1.65 mm, 1.70 mm, 1.75 mm, 1.80 mm, 1.85 mm, 1.90 mm, 1.95 mm, etc.

[0076] At this time, as a flat piece, the thickness of the liquid-cooled lower plate 112 can be slightly smaller than the thickness of the liquid-cooled upper plate 111. Specifically, the thickness of the liquid-cooled lower plate 112 can be 1.0mm-1.5mm. With such a configuration, while ensuring the structural strength and rigidity of the liquid-cooled lower plate 112 and meeting the reliability requirements of the liquid-cooled lower plate 112, the liquid-cooled lower plate 112 can have a smaller thickness, so that the liquid-cooled lower plate 112 remains thin and light. Furthermore, the thinness of the liquid-cooled upper cover 110 is achieved, which is conducive to the thin and light design of the battery pack 10.

[0077] For example, the thickness of the liquid-cooled lower plate 112 is 1.05 mm, 1.10 mm, 1.15 mm, 1.20 mm, 1.25 mm, 1.30 mm, 1.35 mm, 1.40 mm, 1.45 mm, etc.

[0078] Continue to refer to Figure 6 The liquid-cooled upper cover 110 may further include a protective layer 113, which covers the exposed outer surface of the liquid-cooled upper cover 110, or in other words, the protective layer 113 covers the surface of the liquid-cooled upper cover 110 facing away from the battery module 200. Specifically, the protective layer 113 covers the surface of the liquid-cooled upper plate 111 facing away from the liquid-cooled lower plate 112.

[0079] By covering the outer surface of the liquid-cooled upper cover 110 with a protective layer 113, the protective layer 113 can protect the liquid-cooled upper cover 110. For example, the protective layer 113 can prevent dust and water vapor in the external environment from adhering to the outer surface of the liquid-cooled upper cover 110, so that the liquid-cooled upper cover 110 remains clean. Thus, the external environment is prevented from affecting the battery module 200 inside the liquid-cooled box 100, thereby ensuring the reliability and stability of the battery pack 10. In addition, the protective layer 113 can also play a role in heat preservation to prevent the liquid-cooled upper cover 110 from exchanging heat with the external environment, thereby improving the heat exchange effect between the liquid-cooled upper cover 110 and the battery module 200.

[0080] The thickness of the protective layer 113 may be relatively large, so that the protective layer 113 has sufficient structural strength to ensure that the protective layer 113 can play an effective protective role. Specifically, the thickness of the protective layer 113 may be between 2.0 mm and 2.5 mm, for example, the thickness of the protective layer 113 is 2.05 mm, 2.10 mm, 2.15 mm, 2.20 mm, 2.25 mm, 2.30 mm, 2.35 mm, 2.40 mm, 2.45 mm, etc.

[0081] Exemplarily, the protective layer 113 may be made of polyvinyl chloride (PVC for short) material, or in other words, the protective layer 113 may be a polyvinyl chloride layer.

[0082] Continue to refer to Figure 6 The liquid-cooled upper cover 110 may further include a fireproof layer 114, which covers the inner surface of the liquid-cooled upper cover 110, or in other words, the fireproof layer 114 covers the surface of the liquid-cooled upper cover 110 facing the battery module 200. Specifically, the fireproof layer 114 covers the surface of the liquid-cooled lower plate 112 facing away from the liquid-cooled upper plate 111. The fireproof layer 114 may at least cover the area where the battery module 200 is located.

[0083] By covering the inner surface of the liquid cooling upper cover 110 with a fireproof layer 114, the fireproof layer 114 has low thermal conductivity and good high temperature resistance, which can delay the internal temperature rise of the battery module 200, prolong the time of the overall loss of control of the battery module 200, and reduce the risk of fire and explosion of the battery module 200. Even if the battery module 200 catches fire, the impact of the uncontrolled fire of the battery module 200 on the surrounding environment of the battery pack 10 can be reduced, thereby enhancing the safety of the battery pack 10.

[0084] The fireproof layer 114 may only cover the area where the battery module 200 is located. In other words, the fireproof layer 114 is provided for all battery modules 200, and the gaps between the battery modules 200 may not be provided with the fireproof layer 114. Alternatively, the fireproof layer 114 may cover the entire inner surface of the liquid-cooled upper cover 110.

[0085] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A liquid cooling box for a battery pack, characterized in that: include: The liquid-cooled upper cover comprises a liquid-cooled upper plate and a liquid-cooled lower plate which are stacked up and connected to each other, and the liquid-cooled upper plate and the liquid-cooled lower plate together form a liquid flow channel; The main shell is connected to the liquid-cooled upper cover, and the main shell and the liquid-cooled upper cover together form a containing cavity, and the containing cavity is used to contain the battery module.

2. The liquid cooling box of the battery pack according to claim 1, characterized in that: At least one of the liquid-cooled upper plate and the liquid-cooled lower plate has a stamped groove.

3. The liquid cooling box of the battery pack according to claim 2, characterized in that: The liquid-cooled upper plate has the stamping groove, and the edge of the liquid-cooled upper plate is provided with a flange; And / or, the liquid-cooled lower plate has the stamping groove, and the edge of the liquid-cooled lower plate is provided with a flange.

4. The liquid cooling box of the battery pack according to claim 2, characterized in that: The liquid-cooled upper plate has the stamping groove, and the liquid-cooled lower plate is a flat plate.

5. The liquid cooling box of the battery pack according to claim 4, characterized in that: The thickness of the liquid-cooled upper plate is 1.5 mm-2.0 mm, and the thickness of the liquid-cooled lower plate is 1.0 mm-1.5 mm.

6. The liquid cooling box of the battery pack according to any one of claims 1 to 5, characterized in that: The liquid cooling upper cover also includes: The protective layer covers a surface of the liquid-cooled upper plate that is away from the liquid-cooled lower plate.

7. The liquid cooling box of the battery pack according to any one of claims 1 to 5, characterized in that: The liquid cooling upper cover also includes: The fireproof layer is arranged on a surface of the liquid-cooled lower plate which faces away from the liquid-cooled upper plate, and the fireproof layer at least covers the area where the battery module is located.

8. The liquid cooling box of the battery pack according to any one of claims 1 to 5, characterized in that: The liquid cooling upper cover is connected to the main housing via bolts.

9. A battery pack, characterized in that: It comprises a battery module and the liquid cooling box according to any one of claims 1 to 8, wherein the battery module is arranged in a receiving cavity of the liquid cooling box.

10. The battery pack according to claim 9, characterized in that: An aerogel layer is arranged between the liquid cooling upper cover of the liquid cooling box and the battery module.

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