Box assembly, battery device, energy storage device and power utilization device

Abstract

The embodiment of the utility model provides a box body assembly, a battery device, an energy storage device and a power utilization device. The battery device comprises a multi-box assembly and a battery cell assembly. A containing cavity is formed in the box body assembly, and the battery monomer assembly is arranged in the containing cavity. The box body assembly comprises a box body and a cover plate. The box body forms at least part of a containing cavity. The side, deviating from the containing cavity, of the box body is provided with a convex area and a concave area, the cover plate is arranged on the side, deviating from the containing cavity, of the box body, a medium runner is defined by the cover plate and the concave area and used for circulation of a heat exchange medium, and the heat exchange medium is used for heat exchange with the battery monomer assembly. According to the battery device provided by the embodiment of the invention, the thickness of the heat exchange piece can be reduced while the heat exchange piece has relatively good mechanical properties, so that the occupied space and the weight of the heat exchange piece are reduced, and the energy density of the battery device is improved.

Description

Technical Field

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

[0002] This section is intended to provide a background or context to the embodiments of the present application. No description herein is admitted to be prior art by virtue of its inclusion in this section.

[0003] In new energy vehicles equipped with battery devices, the battery devices can be used to provide power in whole or in part. The box assembly is an important component of the battery device, which plays the role of accommodating and protecting the internal battery cell assembly. In the related art, the box assembly has the problems of heavy weight, high cost, and low energy density of the battery device. Utility Model Content

[0004] In view of this, the embodiments of the present application hope to provide a box assembly, a battery device, an energy storage device, and an electrical device, which can reduce weight, reduce costs, and improve the energy density of the battery device to a certain extent.

[0005] To this end, a first aspect of an embodiment of the present application provides a battery device, including:

[0006] Battery cell assembly;

[0007] A box assembly having a receiving cavity inside, wherein the battery cell assembly is arranged in the receiving cavity;

[0008] Wherein, the box assembly includes a box body and a cover plate, the box body constitutes at least part of the accommodating cavity, the side of the box body facing away from the accommodating cavity has a raised area and a recessed area, the cover plate is arranged on the side of the box body facing away from the accommodating cavity, and defines a medium flow channel with the recessed area, the medium flow channel is used for the circulation of heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly.

[0009] The battery device provided in the embodiment of the present application includes a box assembly and a battery cell assembly, wherein the battery cell assembly is arranged in the accommodating cavity of the box assembly, and the box assembly plays a protective role on the battery cell assembly. The box is provided with a recessed area on the side away from the accommodating cavity, and the cover plate is provided on the box, and defines a medium flow channel with the recessed area. That is to say, the medium flow channel is defined and formed by the cover plate and the side wall of the recessed area of ​​the box. In this way, there is no need to additionally set up a heat exchange component with a medium flow channel, which is conducive to reducing the occupied space and weight of the heat exchange component, improving the energy density of the battery device, and reducing the cost. In addition, by arranging the medium flow channel on the outside of the accommodating cavity, the problem of short circuit of the battery device caused by leakage of the heat exchange medium in the medium flow channel can be avoided to a certain extent, thereby improving the reliability of the battery device, and improving the utilization rate of the accommodating cavity inside the box assembly, thereby further improving the compactness and energy density of the battery device.

[0010] In some embodiments, the box is a composite material structure.

[0011] In this embodiment, by setting the box body as a composite material structure, the box body has the characteristics of light weight and high strength, low density, low thermal conductivity and high insulation and voltage resistance performance, and by setting the composite material structure to have a raised area and a recessed area, the structural strength of the box body is further improved, and by setting a cover plate, the cover plate is covered on the box body and defines a medium flow channel with the recessed area. In other words, the recessed area for increasing the structural strength is fully utilized so that the cover plate and the side wall of the recessed area of ​​the box body define a medium flow channel. In this way, there is no need to additionally set up a heat exchange component with a medium flow channel, which is beneficial to reducing the occupied space and weight of the heat exchange component, improving the energy density of the battery device, and reducing the production cost.

[0012] In some embodiments, the box body is constructed as an integral composite material structure formed by compression molding or pultrusion of a composite plate.

[0013] In this embodiment, by setting the box body as an integrated composite material structure, that is, the box body is simultaneously formed with a raised area and a recessed area during the manufacturing process, the processing steps and parts are reduced, which is beneficial to improving production efficiency and reducing costs to a certain extent.

[0014] In some embodiments, the composite board includes a composite material substrate and a box insert, and the box insert is disposed inside the composite material substrate.

[0015] In this embodiment, by configuring the composite board to include a composite material substrate and a box insert, the box has the advantages of both the composite material substrate and the box insert, has certain strength and deformation resistance, and also has certain heat resistance, thereby reducing the weight and production cost of the box.

[0016] In some embodiments, the box body and the cover plate are an integral composite material structure formed by compression molding.

[0017] In this embodiment, by configuring the box body and the cover plate to be an integral composite material structure formed by compression molding, it is beneficial to improve the sealing performance between the box body and the cover plate, and to a certain extent improve the connection strength between the box body and the cover plate.

[0018] In some embodiments, the raised area protrudes toward a side away from the accommodating cavity, and the raised area is adhesively connected to the cover plate.

[0019] In this embodiment, the raised area and the cover plate are connected by bonding. The connection structure is simple and is conducive to improving the sealing performance between the box body and the cover plate, and to a certain extent improves the connection strength between the box body and the cover plate.

[0020] In some embodiments, the box body is provided with a connection port for conducting the heat exchange medium, the connection port is connected to the recessed area, and the connection port is located outside the accommodating cavity.

[0021] In this embodiment, by arranging the connection port outside the accommodating cavity, the problem of short circuit of the battery device caused by leakage of heat exchange medium at the connection port can be avoided to a certain extent, thereby improving the reliability of the battery device.

[0022] In some embodiments, a side surface of the box body facing away from the accommodating cavity is defined as a first surface, and the recessed area is bent and extended on the first surface.

[0023] This is beneficial to increase the extension length of the medium flow channel, that is, the flow path of the heat exchange medium can be increased, thereby improving the heat exchange efficiency between the heat exchange medium and the battery cell assembly.

[0024] In some embodiments, the box assembly includes a support assembly, the support assembly is disposed at the bottom of the box, and the cover is located between the box and the support assembly.

[0025] In this embodiment, by arranging a support assembly at the bottom of the box, it is beneficial to further improve the load-bearing capacity of the box, thereby improving the reliability of the box assembly. In addition, by arranging the support assembly on the side of the cover plate away from the accommodating cavity, it can improve the structural strength and overall rigidity of the box while also providing a certain degree of protection for the cover plate.

[0026] In some embodiments, the support assembly includes a first support member and a second support member, the first support member extends along a first direction, the second support member extends along a second direction, and both ends of the second support member along the second direction are respectively connected to the first support member; wherein the first direction intersects with the second direction, and the first direction is the front-to-back direction of the battery device.

[0027] In this embodiment, by configuring the support assembly to include a first support member and a second support member, and the two ends of the second support member along the second direction are respectively connected to the two first support members, it is beneficial to further improve the structural strength and overall rigidity of the box.

[0028] In some embodiments, a protrusion is provided on the edge of one of the support assembly and the box body, and a groove is provided on the edge of the other one, and the support assembly and the box body are positioned and matched by the protrusion and the groove.

[0029] In this embodiment, the support assembly and the box body are positioned and matched by the protrusion and the groove, which is beneficial to improving the assembly efficiency and connection reliability of the support assembly and the box body. In addition, by supporting the edge of the box body by the support assembly, the structural strength and overall rigidity of the box body assembly are further improved.

[0030] In some embodiments, the support assembly includes a support substrate and a support insert, the support substrate is a composite material structure, and the support insert is disposed inside the support substrate.

[0031] In this embodiment, by configuring the support assembly to include a support substrate and a support insert, the support assembly has the advantages of both the support substrate and the support insert, has certain strength and deformation resistance, and reduces the weight and production cost of the support assembly.

[0032] In some embodiments, the box assembly includes an expansion beam, which extends along a second direction, and the two ends of the expansion beam along the second direction are respectively connected to the box, and the expansion beam is a composite material structure; wherein the first direction intersects with the second direction, and the first direction is the front-to-back direction of the battery device.

[0033] In this embodiment, the expansion beam is configured as a composite material structure, which has the characteristics of low density, light weight and high strength. That is, while reducing the weight of the expansion beam and thus the weight of the battery device, the structural strength of the expansion beam is improved.

[0034] A second aspect of an embodiment of the present application provides a box assembly, which is the box assembly of the battery device described above, and is used to accommodate the battery cell assembly.

[0035] The box assembly provided in the embodiment of the present application is used to accommodate a battery cell assembly, and the box assembly plays a protective role on the battery cell assembly. The box is provided with a recessed area on the side away from the accommodating cavity, and the cover plate is provided on the box, and defines a medium flow channel with the recessed area. In other words, the medium flow channel is defined and formed by the cover plate and the side wall of the recessed area of ​​the box. In this way, there is no need to additionally set up a heat exchange component with a medium flow channel, which is conducive to reducing the occupied space and weight of the heat exchange component, improving the energy density of the battery device, and reducing costs. In addition, by arranging the medium flow channel on the outside of the accommodating cavity, the problem of short circuit of the battery device due to leakage of the heat exchange medium in the medium flow channel can be avoided to a certain extent, thereby improving the reliability of the battery device, and improving the utilization rate of the accommodating cavity inside the box assembly, thereby further improving the compactness and energy density of the battery device.

[0036] A third aspect of an embodiment of the present application provides an energy storage device, comprising a plurality of the battery devices described above, wherein the battery devices are used to store or provide electrical energy.

[0037] The battery device of the energy storage device provided in the embodiment of the present application includes a box assembly and a battery cell assembly. The battery cell assembly is arranged in the accommodating cavity of the box assembly, and the box assembly plays a protective role on the battery cell assembly. The box body is provided with a recessed area on the side away from the accommodating cavity, and the cover plate is provided on the box body, and defines a medium flow channel with the recessed area. That is to say, the medium flow channel is defined and formed by the cover plate and the side wall of the recessed area of ​​the box body. In this way, there is no need to additionally set up a heat exchange component with a medium flow channel, which is conducive to reducing the space and weight occupied by the heat exchange component, improving the energy density of the battery device, and reducing the cost. In addition, by arranging the medium flow channel on the outside of the accommodating cavity, the problem of short circuit of the battery device caused by leakage of the heat exchange medium in the medium flow channel can be avoided to a certain extent, thereby improving the reliability of the battery device, and improving the utilization rate of the accommodating cavity inside the box assembly, thereby further improving the compactness and energy density of the battery device.

[0038] A fourth aspect of an embodiment of the present application provides an electrical device, comprising the battery device described above or the energy storage device described above, wherein the battery device is used to store or provide electrical energy.

[0039] The battery device of the electric device provided in the embodiment of the present application includes a box assembly and a battery cell assembly. The battery cell assembly is arranged in the accommodating cavity of the box assembly, and the box assembly plays a protective role on the battery cell assembly. The box body is provided with a recessed area on the side away from the accommodating cavity, and the cover plate is provided on the box body, and defines a medium flow channel with the recessed area. That is to say, the medium flow channel is defined and formed by the cover plate and the side wall of the recessed area of ​​the box body. In this way, there is no need to additionally set up a heat exchange component with a medium flow channel, which is conducive to reducing the occupied space and weight of the heat exchange component, improving the energy density of the battery device, and reducing the cost. In addition, by arranging the medium flow channel on the outside of the accommodating cavity, the problem of short circuit of the battery device caused by leakage of the heat exchange medium in the medium flow channel can be avoided to a certain extent, thereby improving the reliability of the battery device, and improving the utilization rate of the accommodating cavity inside the box assembly, thereby further improving the compactness and energy density of the battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a vehicle provided in one embodiment of the present application;

[0041] Figure 2 A schematic diagram of a partial structure of a battery device provided in one embodiment of the present application;

[0042] Figure 3 for Figure 2 A top view of

[0043] Figure 4 for Figure 3 Sectional view in the AA direction;

[0044] Figure 5 for Figure 4 The enlarged view of point B in the middle;

[0045] Figure 6 for Figure 2 Exploded diagram of

[0046] Figure 7 A schematic diagram of the structure of a box provided in one embodiment of the present application.

[0047] Description of Reference Numerals

[0048] 20. Box assembly; 21. Box; 211. Raised area; 212. Recessed area; 213. Connecting port; 214. First surface; 215. Groove; 22. Cover plate; 23. Accommodating cavity; 24. Medium flow channel; 25. Support assembly; 251. First support member; 252. Second support member; 253. Protrusion; 26. Expansion beam; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. DETAILED DESCRIPTION

[0049] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0050] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0051] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0052] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0053] With the development of clean energy, more and more devices use electric energy as driving energy, and then power batteries that can store more electric energy and can be charged and discharged repeatedly are developing rapidly, such as lithium-ion batteries. Among them, power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields.

[0054] An embodiment of the present application provides an electrical device, including a battery device of any embodiment of the present application or an energy storage device of any embodiment of the present application, wherein the battery device is used to store or provide electrical energy.

[0055] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0056] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0057] Please refer to Figure 1 , a controller 200, a motor 300 and a battery device 100 may be arranged inside the vehicle 1000, and the controller 200 is used to control the battery device 100 to power the motor 300. For example, the battery device 100 may be arranged at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0058] An embodiment of the present application provides an energy storage device, including a plurality of battery devices 100 according to any embodiment of the present application, and the battery devices 100 are used to store or provide electrical energy.

[0059] The energy storage device can be used in energy storage power stations, wind power generation systems, solar power generation systems, mobile power systems or temporary power supply systems. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during low power consumption and provide electrical energy to relevant users or electrical equipment during peak power consumption. The energy storage system provided in the embodiment of the present application can be any power system that requires the use of an energy storage device.

[0060] In some embodiments, the energy storage device is an energy storage container or an energy storage cabinet.

[0061] See also Figure 2The embodiment of the present application provides a battery device 100, which includes a box assembly 20 and a battery cell assembly. The box assembly 20 has a receiving cavity 23 inside, and the battery cell assembly is arranged in the receiving cavity 23. Among them, the box assembly 20 includes a box body 21 and a cover plate 22. The box body 21 constitutes at least part of the receiving cavity 23. The box body 21 has a raised area 211 and a recessed area 212 on the side away from the receiving cavity 23. The cover plate 22 is arranged on the side of the box body 21 away from the receiving cavity 23, and defines a medium flow channel 24 with the recessed area 212. The medium flow channel 24 is used for the circulation of a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly.

[0062] The battery device 100 (Battery Apparatus) mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly (Battery Cell Assembly) may include multiple battery cells, and the multiple battery cells are connected in series, parallel or mixed through a busbar component.

[0063] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0064] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0065] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, which is arranged between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0066] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0067] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0068] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0069] In some embodiments, the battery device 100 may be a battery pack, which includes a case assembly 20 and one or more battery cell assemblies, wherein the battery cell assembly is accommodated in the case assembly 20 .

[0070] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box assembly 20 by fixing the battery module in the box assembly 20 .

[0071] As an example, the battery cell assembly may also be accommodated in the case assembly 20 by directly fixing a plurality of battery cells to the case assembly 20 .

[0072] As an example, see Figure 2 The box 21 may include a first box and a second box. The first box and the second box are buckled together to form a closed accommodating chamber 23 inside the box assembly 20 to accommodate the battery monomer assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a lower box or an upper box.

[0073] As an example, the box assembly 20 may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed receiving chamber 23 is formed inside the box assembly 20 to accommodate the battery monomer assembly.

[0074] In some embodiments, the box assembly 20 can be used as part of the chassis structure of the vehicle 1000. For example, part of the box assembly 20 can become at least a part of the floor of the vehicle 1000, or part of the box assembly 20 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0075] Here, the box body 21 constituting at least a part of the accommodating chamber 23 means that the box body 21 may constitute a part of the accommodating chamber 23 or the entire accommodating chamber 23 .

[0076] See also Figure 4 and Figure 5 The box body 21 has a raised area 211 and a recessed area 212 on the side away from the accommodating cavity 23 , that is, the box body 21 has a raised area 211 and a recessed area 212 formed on the outside of the accommodating cavity 23 , which is beneficial to improve the structural strength of the box body 21 .

[0077] The cover plate 22 is disposed on a side of the box body 21 facing away from the accommodating chamber 23 , that is, the cover plate 22 is disposed on the outside of the box body 21 .

[0078] The cover plate 22 and the recessed area 212 define a medium flow channel 24. That is, by covering the cover plate 22 on the recessed area 212 of the box body 21, a sealed medium flow channel 24 is formed between the cover plate 22 and the recessed area 212 for the circulation of heat exchange medium. In this way, there is no need to additionally set up a heat exchange component with a medium flow channel 24, which is beneficial to reducing weight and reducing costs.

[0079] For example, see Figure 2 and Figure 3 The box body 21 is provided with a connection port 213 for conducting a heat exchange medium, and the connection port 213 is connected to the recessed area 212 , that is, the medium flow channel 24 can be connected to the outside through the connection port 213 .

[0080] Exemplarily, the connection port 213 includes an inlet and an outlet, and both the inlet and the outlet are communicated with the medium flow channel 24 .

[0081] Here, the inlet and outlet of the box body 21 are used to be connected to the pipelines of the air conditioning system or water tank or other liquid storage devices of the vehicle or electrical equipment.

[0082] It should be noted that the specific type of heat exchange medium is not limited here, as long as it can achieve heat exchange effect with the battery cell, for example, it can be gaseous or liquid. In the embodiment of the present disclosure, the heat exchange medium is described as a coolant as an example.

[0083] It should be noted that the specific number of the medium flow channels 24 is not limited here, and can be one or more.

[0084] The multiple mentioned in the embodiments of the present disclosure refers to a number of two or more.

[0085] The principle of heat exchange of the battery cell assembly by the heat exchange medium is as follows: the heat exchange medium output by the heat exchange medium source (not shown) enters the medium flow channel 24 through the inlet of the box 21, and after the heat exchange medium exchanges heat with the battery cell assembly, the heat exchange medium flows out through the outlet of the box 21, completing the heat exchange of the battery cell assembly.

[0086] Here, the heat exchange medium exchanging heat with the battery cell assembly may be to dissipate heat from the battery cell assembly or to heat the battery cell assembly.

[0087] In the related art, the battery device is provided with a heat exchange assembly having a medium flow channel, and the heat exchange assembly is used to exchange heat for the battery monomer assembly. However, the aluminum water cooling plate of the heat exchange assembly in the related art is heavy, which reduces the energy density and has a high production cost.

[0088] The battery device 100 provided in the embodiment of the present application includes a box assembly 20 and a battery cell assembly, wherein the battery cell assembly is arranged in the accommodating cavity 23 of the box assembly 20, and the box assembly 20 plays a protective role on the battery cell assembly. The box 21 is provided with a recessed area 212 on the side away from the accommodating cavity 23, and the cover plate 22 is provided on the box 21, and defines a medium flow channel 24 with the recessed area 212, that is, the medium flow channel 24 is defined and formed by the cover plate 22 and the side wall of the recessed area 212 of the box 21, so that there is no need to additionally set up a heat exchange component with a medium flow channel 24, which is conducive to reducing the occupied space and weight of the heat exchange component, improving the energy density of the battery device 100, and reducing the production cost. In addition, by arranging the medium flow channel 24 on the outside of the accommodating cavity 23, the problem of short circuit of the battery device 100 caused by leakage of the heat exchange medium in the medium flow channel 24 can be avoided to a certain extent, thereby improving the reliability of the battery device 100 and improving the utilization rate of the accommodating cavity 23 inside the box assembly 20, thereby further improving the compactness and energy density of the battery device 100.

[0089] In some embodiments, the housing 21 is a composite material structure.

[0090] It should be noted that the composite material structure can be formed by compression molding, pultrusion molding, etc.

[0091] It can be understood that the density of the composite material structure is less than or equal to 2 / 3 of the density of the aluminum profile. In this way, the density of the box body 21 of the composite material structure is less than or equal to 2 / 3 of the density of the box body 21 of the aluminum profile. That is to say, by setting the box body 21 as a composite material structure, it is beneficial to further reduce the weight of the battery device 100 and further improve the energy density of the battery device 100.

[0092] The thermal conductivity of the composite material structure box 21 is smaller than that of metal. Therefore, the composite material structure box 21 has better thermal insulation performance and has a certain improvement effect on the endurance rate in some places with lower temperatures.

[0093] The box body 21 of the composite material structure has high insulation withstand voltage performance, which can avoid problems such as insulation withstand voltage failure caused by too close electrical gaps between metals.

[0094] In this embodiment, by setting the box body 21 as a composite material structure, the box body 21 has the characteristics of light weight, high strength, low density, low thermal conductivity and high insulation and voltage resistance performance, and by setting the composite material structure to have a raised area 211 and a recessed area 212, the structural strength of the box body 21 is further improved, and by setting a cover plate 22, the cover plate 22 is covered on the box body 21, and defines a medium flow channel 24 with the recessed area 212, that is, the recessed area 212 that increases the structural strength is fully utilized, so that the cover plate 22 and the side wall of the recessed area 212 of the box body 21 define the medium flow channel 24, so that there is no need to additionally set up a heat exchange component with a medium flow channel 24, which is beneficial to reducing the occupied space and weight of the heat exchange component, improving the energy density of the battery device 100, and reducing the production cost.

[0095] In some embodiments, the box body 21 is constructed as an integral composite material structure formed by compression molding or pultrusion of a composite plate.

[0096] Here, the composite board is, for example, a plate-like structure formed by fiber prepreg, and the plate-like structure formed by the fiber prepreg is molded into the box body 21 .

[0097] In this embodiment, the box body 21 is constructed to be formed of a composite plate, the composite plate is configured to include fibers and a matrix, and the matrix is ​​attached to the continuous fibers. The composite plate has the characteristics of low density, light weight, and high strength. That is, while it is beneficial to reduce the weight of the composite plate and thus reduce the weight of the battery device 100, the structural strength of the box body 21 is improved.

[0098] Illustratively, the fibers are long fibers or continuous fibers.

[0099] Illustratively, the fiber may be glass fiber, aramid fiber, carbon fiber, basalt fiber, or the like.

[0100] Here, the matrix is, for example, a thermoplastic resin, which has the properties of softening when heated and hardening when cooled, and does not react chemically, and can maintain this property no matter how many times the heating and cooling are repeated. Thermoplastic resins have good toughness, large damage tolerance, good dielectric constant, unlimited storage period, no need for low-temperature storage, and no need for large-scale special equipment such as autoclaves for molding. In particular, they have good recyclability, recoverability, reusability, and environmental friendliness, which adapts to the current development direction of environmentally friendly materials.

[0101] Of course, in other embodiments, the matrix may also be a thermosetting resin.

[0102] Pultrusion refers to a process for producing composite material profiles by impregnating continuous fibers or their fabrics with resin under the traction of a traction device and curing the resin by heating a molding die.

[0103] Of course, in other embodiments, the box body 21 may also be an integrated composite material structure formed by other methods such as hand lay-up.

[0104] In this embodiment, by setting the box body 21 as an integrated composite material structure, that is, the box body 21 is simultaneously formed with the raised area 211 and the recessed area 212 during the manufacturing process, the processing steps and parts are reduced, which is beneficial to improving production efficiency and reducing costs to a certain extent.

[0105] In some embodiments, the composite panel includes a composite substrate and a box insert, wherein the box insert is disposed inside the composite substrate.

[0106] Here, the specific type of the composite material substrate is not limited.

[0107] Exemplarily, the box insert is a metal part, which is beneficial to improving the strength and heat resistance of the box 21 and also beneficial to reducing the damage caused by thermal runaway of the battery cell.

[0108] Exemplarily, the box insert is a foam piece, which is beneficial to improving the deformation performance of the box 21 and further reducing the weight of the box 21.

[0109] In this embodiment, by setting the composite plate to include a composite material substrate and a box insert, the box 21 has the advantages of both the composite material substrate and the box insert, has a certain strength and deformation resistance, and also has a certain heat resistance, thereby reducing the weight and production cost of the box 21.

[0110] It should be noted that the specific material of the cover plate 22 is not limited here, and it can be, for example, a metal part, an injection molded part, or a composite plate.

[0111] It should be noted that the specific connection method between the box body 21 and the cover plate 22 is not limited here.

[0112] In some embodiments, see Figures 5 and 6 The box body 21 and the cover plate 22 are an integral composite material structure formed by compression molding.

[0113] For example, the cover plate 22 may be a composite material structure formed by molding fiber prepreg.

[0114] In this embodiment, by setting the cover plate 22 as a composite material structure, the composite material structure is set to include fibers and a matrix, and the matrix is ​​attached to the continuous fibers. The cover plate 22 has the characteristics of low density, light weight and high strength. That is to say, it is beneficial to reduce the weight of the cover plate 22, thereby reducing the weight of the battery device 100, while improving the structural strength of the cover plate 22.

[0115] In this embodiment, by configuring the box body 21 and the cover plate 22 as an integrally molded composite material structure, it is beneficial to improve the sealing performance between the box body 21 and the cover plate 22, and to a certain extent improve the connection strength between the box body 21 and the cover plate 22.

[0116] In some embodiments, the cover plate 22 includes a cover plate substrate and a cover plate inlay, wherein the cover plate inlay is disposed inside the cover plate substrate.

[0117] In this embodiment, by configuring the cover plate 22 to include a cover plate substrate and a cover plate insert, the cover plate 22 has the advantages of both the cover plate substrate and the cover plate insert, has certain strength and deformation resistance, and also has certain heat resistance, thereby reducing the weight and production cost of the cover plate 22.

[0118] It should be noted that the orientation of the raised area 211 is not limited here.

[0119] In some embodiments, see Figures 4 to 5 , the raised area 211 may be protruded toward a side away from the accommodating cavity 23. In other embodiments, the raised area 211 may also be protruded toward a side of the accommodating cavity 23.

[0120] In some embodiments, see Figures 5 and 6 , the raised area 211 is bonded to the cover plate 22 .

[0121] Exemplarily, a structural adhesive may be applied between the raised area 211 and the cover plate 22 to bond the raised area 211 to the cover plate 22 .

[0122] In this embodiment, the raised area 211 is connected to the cover plate 22 by bonding. The connection structure is simple and is conducive to improving the sealing performance between the box body 21 and the cover plate 22, and to a certain extent improves the connection strength between the box body 21 and the cover plate 22.

[0123] In some embodiments, see Figures 2 to 3 The connection port 213 is located outside the accommodating cavity 23 .

[0124] In this embodiment, by arranging the connection port 213 outside the accommodating cavity 23 , the problem of short circuit of the battery device 100 caused by leakage of heat exchange medium at the connection port 213 can be avoided to a certain extent, thereby improving the reliability of the battery device 100 .

[0125] In some embodiments, see Figure 7 A side surface of the box body 21 facing away from the accommodating cavity 23 is defined as a first surface 214 , and the recessed area 212 is bent and extended on the first surface 214 .

[0126] Here, the first surface 214 may be a side surface of the bottom wall of the box body 21 facing away from the accommodating cavity 23 .

[0127] The recessed area 212 bends and extends on the first surface 214, that is, the medium flow channel 24 bends and extends on the first surface 214, which is beneficial to increase the extension length of the medium flow channel 24, that is, the flow path of the heat exchange medium can be increased, thereby improving the heat exchange efficiency between the heat exchange medium and the battery cell assembly.

[0128] In some embodiments, see Figures 5 and 6 The box assembly 20 includes a support assembly 25 , which is disposed at the bottom of the box 21 , and the cover plate 22 is located between the box 21 and the support assembly 25 .

[0129] It is understandable that the box assembly 20 is usually used to bear the weight of the battery cell assembly. Thus, the structural strength of the box assembly 20 has a great influence on the service life of the box assembly 20 .

[0130] The support assembly 25 is disposed at the bottom of the box body 21 , which is beneficial to further improve the load-bearing capacity of the box body 21 and the overall rigidity of the box body 21 .

[0131] The cover plate 22 is located between the box body 21 and the support assembly 25 , that is, the support assembly 25 is arranged on the side of the cover plate 22 away from the accommodating cavity 23 , which can play a certain protective role for the cover plate 22 .

[0132] In this embodiment, by arranging a support assembly 25 at the bottom of the box body 21, it is beneficial to further improve the load-bearing capacity of the box body 21, thereby improving the reliability of the box body assembly 20. In addition, by arranging the support assembly 25 on the side of the cover plate 22 away from the accommodating cavity 23, while improving the structural strength and overall rigidity of the box body 21, it can also provide a certain protection for the cover plate 22.

[0133] In some embodiments, see Figure 6 The support assembly 25 includes a first support member 251 and a second support member 252, the first support member 251 extends along a first direction, the second support member 252 extends along a second direction, and both ends of the second support member 252 along the second direction are respectively connected to the first support member 251; wherein the first direction intersects with the second direction, and the first direction is the front-to-back direction of the battery device 100.

[0134] Here, the first direction intersecting the second direction means that the first direction is not parallel to the second direction. Exemplarily, the first direction and the second direction are perpendicular to each other.

[0135] Exemplarily, the first direction is the front-to-back direction of the battery device 100, and the second direction is the left-to-right direction of the battery device 100. Figure 3 and Figure 4As shown, the first direction is represented by X, the second direction is represented by Y, and the height direction of the battery device 100 is represented by Z.

[0136] Exemplarily, the number of the first support members 251 is two, and the two first support members 251 are arranged at intervals along the second direction.

[0137] Exemplarily, there are multiple second support members 252 , and the multiple second support members 252 are arranged at intervals along the first direction.

[0138] Exemplarily, two ends of the second support member 252 along the second direction are respectively connected to the two first support members 251 .

[0139] In this embodiment, by configuring the support assembly 25 to include a first support member 251 and a second support member 252, and the two ends of the second support member 252 along the second direction are respectively connected to the two first support members 251, it is beneficial to further improve the structural strength and overall rigidity of the box body 21.

[0140] In some embodiments, see Figures 5 and 6 A protrusion 253 is provided on the edge of one of the support assembly 25 and the box body 21 , and a groove 215 is provided on the edge of the other one of the support assembly 25 and the box body 21 . The support assembly 25 and the box body 21 are positioned and matched by the protrusion 253 and the groove 215 .

[0141] The edge of one of the support component 25 and the box body 21 is provided with a protrusion 253, and the edge of the other one is provided with a groove 215. This means that the edge of the support component 25 can be provided with the protrusion 253, and the edge of the box body 21 is provided with the groove 215; or the edge of the box body 21 can be provided with the protrusion 253, and the edge of the support component 25 is provided with the groove 215.

[0142] In this embodiment, the support assembly 25 and the box body 21 are positioned and matched by the protrusion 253 and the groove 215, which is beneficial to improving the assembly efficiency and connection reliability of the support assembly 25 and the box body 21. In addition, by supporting the edge of the box body 21 by the support assembly 25, the structural strength and overall rigidity of the box body assembly 20 are further improved.

[0143] In some embodiments, the support assembly 25 includes a support substrate and a support insert. The support substrate is a composite material structure, and the support insert is disposed inside the support substrate.

[0144] In this embodiment, by configuring the support assembly 25 to include a support substrate and a support insert, the support assembly 25 has the advantages of both the support substrate and the support insert, has a certain strength and deformation resistance, and reduces the weight and production cost of the support assembly 25.

[0145] In some embodiments, see Figure 2 The box assembly 20 includes an expansion beam 26, which extends along the second direction, and both ends of the expansion beam 26 along the second direction are respectively connected to the box 21, and the expansion beam 26 is a composite material structure.

[0146] It should be noted that the battery cell assembly is, for example, a battery module, or an assembly consisting of a plurality of battery cells.

[0147] Here, a plurality of battery cells are arranged and fixed to form a battery module. For example, the battery module further includes end plates, and the end plates are provided at both ends of the plurality of battery cells along the arrangement direction. In this way, the two end plates of the battery module can be moved toward each other so that the battery cells of the battery module are closely arranged.

[0148] Here, the specific method of connecting the battery cell assembly to the expansion beam 26 is not limited. For example, the battery cell assembly is connected to the expansion beam 26 through an end plate, for example, the end plate and the expansion beam 26 are tightly connected. In this way, it is conducive to the close arrangement of the battery cells of the battery module. In addition, when the battery cell expands laterally, the end plate can support the battery cell, improve the anti-expansion ability of the battery cell, and improve the problem of battery cell failure due to expansion force. Furthermore, the expansion beam 26 can also support the bottom of the battery cell, further improving the anti-expansion ability of the battery cell.

[0149] In this embodiment, the expansion beam 26 is configured as a composite material structure, which has the characteristics of low density, light weight and high strength. That is, while reducing the weight of the expansion beam 26 and thus reducing the weight of the battery device 100, the structural strength of the expansion beam 26 is improved.

[0150] In some embodiments, the expansion beam 26 includes an expansion beam substrate and an expansion beam insert. The expansion beam substrate is a composite material structure, and the expansion beam insert is disposed inside the expansion beam substrate.

[0151] In this embodiment, by configuring the expansion beam 26 to include an expansion beam substrate and an expansion beam insert, the expansion beam 26 has the advantages of both the expansion beam substrate and the expansion beam insert, has a certain strength and deformation resistance, and reduces the weight and production cost of the expansion beam 26.

[0152] In the description of the present application, the description with reference to the terms "in one embodiment", "in some embodiments", "in other embodiments", "in yet other embodiments", or "exemplary" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In the present application, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine the different embodiments or examples described in the present application and the features of the different embodiments or examples without contradiction.

[0153] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Battery cell assembly; A box assembly, wherein the box assembly has a receiving cavity inside, and the battery cell assembly is arranged in the receiving cavity; Wherein, the box assembly includes a box body and a cover plate, the box body constitutes at least part of the accommodating cavity, the side of the box body facing away from the accommodating cavity has a raised area and a recessed area, the cover plate is arranged on the side of the box body facing away from the accommodating cavity, and defines a medium flow channel with the recessed area, the medium flow channel is used for the circulation of heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell assembly.

2. The battery device according to claim 1, characterized in that: The box body is a composite material structure.

3. The battery device according to claim 2, characterized in that: The box body is constructed as an integrated composite material structure formed by compression molding or pultrusion of a composite plate.

4. The battery device according to claim 3, characterized in that: The composite board comprises a composite material substrate and a box insert, and the box insert is arranged inside the composite material substrate.

5. The battery device according to claim 2, characterized in that: The box body and the cover plate are an integral composite material structure formed by compression molding.

6. The battery device according to claim 1, characterized in that: The raised area protrudes toward a side facing away from the accommodating cavity, and the raised area is adhesively connected to the cover plate.

7. The battery device according to any one of claims 1 to 6, characterized in that: The box body is provided with a connection port for conducting the heat exchange medium, the connection port is connected to the recessed area, and the connection port is located outside the accommodating cavity.

8. The battery device according to any one of claims 1 to 6, characterized in that: A side surface of the box body facing away from the accommodating cavity is defined as a first surface, and the recessed area is bent and extended on the first surface.

9. The battery device according to any one of claims 1 to 6, characterized in that: The box assembly comprises a supporting assembly, wherein the supporting assembly is arranged at the bottom of the box, and the cover plate is located between the box and the supporting assembly.

10. The battery device according to claim 9, characterized in that: The support assembly includes a first support member and a second support member, the first support member extends along a first direction, the second support member extends along a second direction, and both ends of the second support member along the second direction are respectively connected to the first support member; wherein the first direction intersects with the second direction, and the first direction is the front-to-back direction of the battery device.

11. The battery device according to claim 9, characterized in that: The edge of one of the support assembly and the box body is provided with a protrusion, and the edge of the other one of the protrusion and the box body is provided with a groove, and the support assembly and the box body are positioned and matched through the protrusion and the groove.

12. The battery device according to claim 9, characterized in that: The support assembly comprises a support base plate and a support insert, wherein the support base plate is a composite material structure, and the support insert is arranged inside the support base plate.

13. The battery device according to claim 1, characterized in that: The box assembly includes an expansion beam, which extends along a second direction, and the two ends of the expansion beam along the second direction are respectively connected to the box, and the expansion beam is a composite material structure; wherein the second direction intersects with the first direction, and the first direction is the front-to-back direction of the battery device.

14. A box assembly, characterized in that: The box assembly is the box assembly of the battery device according to any one of claims 1 to 13, and the box assembly is used to accommodate the battery cell assembly.

15. An energy storage device, characterized in that: The invention comprises a plurality of battery devices according to any one of claims 1 to 13, wherein the battery devices are used to store or provide electrical energy.

16. An electrical device, characterized in that: It comprises the battery device according to any one of claims 1 to 13 or the energy storage device according to claim 15, wherein the battery device is used to store or provide electrical energy.

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