Battery box body, battery and electric equipment

Abstract

The invention provides a battery box body, a battery and electric equipment. The battery box body comprises a box body and a battery box body, the heat exchange plate is arranged at the bottom of the box body; the thermal insulation part covers the outer wall of the heat exchange plate, and the outer wall of the thermal insulation part forms the outer wall of the battery box body. According to the battery box body provided by the invention, the thermal insulation part gives consideration to the protection effect of the protection plate, so that the protection plate does not need to be arranged on the outer wall of the thermal insulation part, the number of parts of the battery box body is reduced, the weight of the battery box body is reduced, the energy density of the battery box body is improved, and the thermal insulation performance of the battery box body is improved; and the impact resistance of the bottom of the battery box body can be improved by increasing the thickness of the heat preservation part.

Description

[0001] This application is a divisional application of the invention patent application with the application date of September 13, 2022, application number 202211106995.0, and name "Battery box, battery and electrical equipment". Technical Field

[0002] The embodiments of the present application relate to the field of energy storage technology, and specifically to a battery box, a battery, and an electrical device. Background Art

[0003] In the prior art, a battery case requires many parts to be assembled, and many of the parts have high requirements for assembly precision during the assembly process. The assembly process is complex, and the assembly tolerance formed after the assembly is completed is large. In addition, multiple parts are assembled to form multiple assembly surfaces, which increases the risk of failure of the assembly surfaces. Summary of the invention

[0004] In view of the above problems, the embodiments of the present application provide a battery case, a battery and an electrical equipment. The battery case takes into account the protective function of the protective plate through the thermal insulation component, so there is no need to set the protective plate on the outer wall of the thermal insulation component, thereby reducing the number of parts of the battery case and reducing the weight of the battery case, thereby increasing the energy density of the battery case and improving the thermal insulation performance of the battery case. The impact resistance of the bottom of the battery case can also be improved by increasing the thickness of the thermal insulation component.

[0005] The first aspect of the present application provides a battery case, comprising: a case; a heat exchange plate, which is arranged at the bottom of the case; and a thermal insulation component, which covers the outer wall of the heat exchange plate, and the outer wall of the thermal insulation component constitutes the outer wall of the battery case.

[0006] The battery case provided in the present application takes into account the protective function of the protective plate through the thermal insulation component, so there is no need to set the protective plate on the outer wall of the thermal insulation component, thereby reducing the number of parts of the battery case. At the same time, the low density of the thermal insulation component can also reduce the weight of the battery case, thereby increasing the energy density of the battery case. The strong thermal insulation performance of the thermal insulation component can also improve the thermal insulation performance of the battery case. In addition, the impact resistance of the bottom of the battery case can be improved by using a thermal insulation component of greater thickness.

[0007] In some embodiments, the heat-insulating element includes a foam layer, and the foam layer is sprayed onto the outer wall of the heat exchange plate. The foam layer is integrated into the heat exchange plate by spraying, and there is no need to assemble the foam layer and the heat exchange plate separately, which reduces the types and number of parts of the battery box and saves the installation steps of the heat-insulating element.

[0008] In some embodiments, the material of the foam layer includes polyurethane foam or polypropylene plastic.

[0009] In some embodiments, the heat preservation member includes a heat preservation plate, which is provided as an integrally formed structure. The heat preservation plate not only reduces the types and number of parts of the battery box, but also can provide heat preservation and protection for the heat exchange plate. Moreover, the heat preservation plate is provided as an integrally formed structure, and no additional heat preservation plate is required, thereby reducing the failure risk of various different connection interfaces.

[0010] In some embodiments, the heat preservation plate includes a heat insulation layer and a buffer protection layer, and the heat insulation layer and the buffer protection layer are provided with an integrally formed structure. The heat insulation layer plays a role in heat preservation of the heat exchange plate, and the buffer protection layer plays a role in protecting the heat exchange plate. Moreover, the integrally formed heat preservation plate can reduce the number of parts and reduce the assembly process.

[0011] In some embodiments, the thermal insulation layer includes a foamed polyurethane layer, and / or the buffer protection layer includes a PP honeycomb layer.

[0012] In some embodiments, the inner wall of the insulation plate is in close contact with the outer wall of the heat exchange plate, and / or the edge profile of the insulation plate matches the edge profile of the heat exchange plate. The inner wall of the insulation plate is in close contact with the outer wall of the heat exchange plate, including the insulation plate filling the gap between the insulation plate and the heat exchange plate through its own flexible deformation or expansion, thereby reducing the accumulation of condensed water or debris in the gap between the insulation plate and the heat exchange plate to affect the NVH performance of the whole vehicle.

[0013] In some embodiments, the heat exchange plate is configured as a liquid cooling plate, and the outer wall of the liquid cooling plate is provided with a flow channel protrusion, and the inner wall of the heat preservation plate is provided with a groove that matches the flow channel protrusion. By configuring the inner wall contour of the heat preservation plate to match the outer wall contour of the heat exchange plate, the volume of the cavity between the heat preservation plate and the heat exchange plate can be reduced, and the contact area between the heat preservation plate and the heat exchange plate can be increased.

[0014] In some embodiments, a flexible pad is laid on the bottom of the box, and the heat exchange plate covers the outer wall of the flexible pad. The flexible pad buffers the force between the battery cell or battery module and the heat exchange plate, thereby reducing the risk of the battery cell or battery module being damaged due to hard collision.

[0015] In some embodiments, a snap-in groove is provided at the bottom of the box, and at least a portion of the heat-insulating element is embedded in the snap-in groove. By filling at least a portion of the heat-insulating element into the snap-in groove of the box, the strength and rigidity of the battery box can be improved, and at the same time, the weight of the battery box can be reduced, thereby achieving lightweighting of the entire battery box.

[0016] In some embodiments, the box includes a beam frame and a frame arranged around the beam frame in a circumferential direction, and at least a portion of the heat-insulating component is assembled to the beam frame and / or the frame. At least a portion of the heat-insulating component is assembled to the beam frame and / or the frame by means of adhesive or fasteners, so that the heat-insulating component is arranged close to the heat exchange plate, thereby improving the temperature control and protection effect of the heat-insulating component on the heat exchange plate, and reducing the gap between the heat exchange plate and the heat-insulating component to affect the performance of the battery box.

[0017] A second aspect of the present application provides a battery, the battery comprising: at least one battery cell or a battery module; and a battery case according to the first aspect of the present application, wherein the at least one battery cell or battery module is arranged in the accommodating space of the battery case.

[0018] A third aspect of the present application provides an electrical device, the electrical device comprising the battery according to the second aspect of the present application.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0021] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0022] Figure 2 A schematic diagram of the exploded structure of a battery according to some embodiments of the present application;

[0023] Figure 3 This is a schematic diagram of the structure of a battery module of some embodiments of the present application;

[0024] Figure 4 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0025] Figure 5 This is a schematic diagram of the disassembled structure of the battery box of an embodiment of the present application;

[0026] Figure 6 for Figure 5 A schematic diagram of the structure of the split insulation plate of the battery box shown;

[0027] Figure 7 for Figure 5A schematic diagram of the top view of the battery box shown;

[0028] Figure 8 for Figure 7 A schematic diagram of the structure of the split insulation plate of the battery box shown;

[0029] Fig. 9 This is a schematic diagram of the structure of the insulation board of some embodiments of the present application.

[0030] Some of the reference numerals in the specific implementation manner are as follows:

[0031] 1,000 vehicles;

[0032] 100 batteries, 200 frames;

[0033] 10 battery box, 11 first part, 12 second part, 13 flange;

[0034] 20 battery module, 21 battery cell, 211 end cover, 211a electrode terminal, 212 housing, 213 electrode assembly;

[0035] 110 box body, 101 beam frame, 102 frame, 120 heat exchange plate, 121 flow channel protrusion, 130 insulation component, 131 plate body, 132 groove, 133 installation part, 140 flexible pad. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0038] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0042] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of 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 embodiments of the present application.

[0043] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0044] In the prior art, a battery case requires many parts to be assembled, and many of the parts have high requirements for assembly precision during the assembly process. The assembly process is complex, and the assembly tolerance formed after the assembly is completed is large. In addition, multiple parts are assembled to form multiple assembly surfaces, which increases the risk of failure of the assembly surfaces.

[0045] Specifically, during the assembly process of the battery case, the liquid cooling plate, foam and bottom guard plate need to be installed together to form the bottom of the battery case. The foam is pasted between the liquid cooling plate and the bottom guard plate, and the bottom guard plate is fixed to the bottom of the battery case by bolts or welding and gluing. The assembly composed of the liquid cooling plate, foam and bottom guard plate not only increases the number of parts of the battery case, but also the cavity between the bottom guard plate and the liquid cooling plate is prone to form condensation water, or small stones and other foreign objects enter, affecting the NVH performance (noise, vibration and harshness) of the whole vehicle. Moreover, the bottom guard plate has only one layer of plate, which cannot effectively buffer mechanical impact conditions such as bottom impact. The bottom guard plate also increases the weight and cost of the battery case, and the thermal insulation effect of the bottom guard plate is poor.

[0046] In order to solve the technical problem that the protective plate of the battery box on the market affects the performance of the battery box, the battery box provided in the present application improves the performance of the battery box by taking into account the protective effect of the protective plate while using the thermal insulation component.

[0047] The battery box disclosed in the embodiment of the present application can be used for batteries. The battery box is used to accommodate battery cells or battery modules. For example, vehicles, ships and other equipment that need to use electric energy need batteries. The battery includes a battery box and battery cells or battery modules.

[0048] For the convenience of description, the following embodiments are described by taking a battery according to an embodiment of the present application as an example.

[0049] Please see Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application. A battery 100 and a frame 200 are provided inside the vehicle 1000, and the battery 100 can be provided on the frame 200. Multiple batteries 100 can be stacked from top to bottom on the frame 200, or can be laid flat on the frame 200.

[0050] Please see Figure 2 and Figure 3 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application, Figure 3The schematic diagram of the structure of the battery module of some embodiments of the present application. The battery 100 includes a battery case 10 and a battery cell 21, and the battery cell 21 is contained in the battery case 10. Among them, the battery case 10 is used to provide a storage space for the battery cell 21, and the battery case 10 can adopt a variety of structures. In some embodiments, the battery case 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 21. Optionally, to ensure the sealing effect, the first part 11 and the second part 12 are both provided with matching flanges 13 at the edge position. The second part 12 can be a hollow structure with one end open, and the first part 11 can be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 can also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the battery case 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid, etc.

[0051] In the battery 100, there may be multiple battery cells 21, and the multiple battery cells 21 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 21 are both connected in series and in parallel. The multiple battery cells 21 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 21 is accommodated in the box 10; of course, the battery 100 may also be a battery module 20 in the form of multiple battery cells 21 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a converging component for realizing electrical connection between the multiple battery cells 21.

[0052] The battery cell 21 may be a secondary battery or a primary battery, a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 21 may be cylindrical, flat, rectangular or in other shapes.

[0053] See also Figure 3 , Figure 3 A schematic structural diagram of a battery module 20 according to an embodiment of the present application is shown. Figure 3In the embodiment, the battery module 20 may include a plurality of battery cells 21, and the plurality of battery cells 21 may be first connected in series, in parallel, or in a mixed connection to form the battery module 20, and then the plurality of battery modules 20 may be connected in series, in parallel, or in a mixed connection to form the battery 10. The battery cells 21 are generally divided into three types according to the packaging method: cylindrical battery cells 21, square battery cells 21, and soft-pack battery cells 21, and the embodiments of the present application do not limit this. However, for the sake of simplicity, the following embodiments are all described by taking the square battery cells 21 as an example.

[0054] Figure 4 The schematic diagram of the exploded structure of the battery cell 21 provided in some embodiments of the present application. The battery cell 21 refers to the smallest unit constituting the battery 100. Figure 4 The battery cell 21 includes an end cover 211 , a shell 212 and an electrode assembly 213 .

[0055] The end cap 211 refers to a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 21 from the external environment. The shape of the end cap 211 can be adapted to the shape of the shell 212 to match the shell 212. Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 211 is not easily deformed when squeezed and collided, so that the battery cell 21 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals 211a can be provided on the end cap 211. The electrode terminal 211a can be used to electrically connect with the electrode assembly 213 to output or input the electrical energy of the battery cell 21. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 21 reaches a threshold. In some embodiments, an insulating member can also be provided on the inner side of the end cap 211, and the insulating member can be used to isolate the electrical connection components in the shell 212 from the end cap 211 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0056] The shell 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 21, wherein the formed internal environment can be used to accommodate the electrode assembly 213, the electrolyte (not shown in the figure) and other components. The shell 212 and the end cap 211 can be independent components, and an opening can be set on the shell 212, and the internal environment of the battery cell 21 is formed by covering the opening with the end cap 211 at the opening. Optionally, the end cap 211 and the shell 212 can also be integrated. Specifically, the end cap 211 and the shell 212 can form a common connection surface before other components are put into the shell, and when it is necessary to encapsulate the interior of the shell 212, the end cap 211 covers the shell 212. The shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 213. The shell 212 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special limitation on this.

[0057] The electrode assembly 213 is a component in the battery cell 21 where an electrochemical reaction occurs. One or more electrode assemblies 213 may be contained in the housing 212. The electrode assembly 213 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The portion of the positive electrode sheet and the negative electrode sheet with active materials constitutes the main body of the electrode assembly 213, and the portion of the positive electrode sheet and the negative electrode sheet without active materials each constitutes a pole ear (not shown in the figure). The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 100, the positive electrode active material and the negative electrode active material react with the electrolyte, and the pole ear connects the electrode terminal 211a to form a current loop.

[0058] Please see Figures 5 to 9 , Figure 5 This is a schematic diagram of the disassembled structure of the battery box of an embodiment of the present application; Figure 6 for Figure 5 A schematic diagram of the structure of the split insulation plate of the battery box shown; Figure 7 for Figure 5 A schematic diagram of the top view of the battery box shown; Figure 8 for Figure 7 A schematic diagram of the structure of the split insulation plate of the battery box shown; Fig. 9 This is a schematic diagram of the structure of the insulation board of some embodiments of the present application.

[0059] In a first aspect, the present application provides a battery case 10, which includes a case 110, a heat exchange plate 120 and a thermal insulation member 130, wherein the heat exchange plate 120 is disposed at the bottom of the case 110, the thermal insulation member 130 covers the outer wall of the heat exchange plate 120, and the outer wall of the thermal insulation member 130 constitutes the outer wall of the battery case 10.

[0060] In this embodiment, the battery box 10 in the embodiment of the present application can be Figure 2 The box-like structure shown can also be Figure 5-Figure 8 The tray-shaped structure shown in the figure, both structures belong to the protection scope of the battery box 10 of the embodiment of the present application, and will be described below Figure 5-Figure 8 The battery case 10 shown is described in detail as a preferred embodiment.

[0061] The heat exchange plate 120 can be selected as a liquid cooling plate, an air cooling plate or other types of heat dissipation plates. Chemical batteries such as lithium batteries have the characteristics of high energy density, long service life and high operating voltage. However, when chemical batteries are working, high and low temperatures have a great impact on the battery cells. In order to make the operating temperature of the battery cells in the chemical battery consistent, the internal temperature of the battery box 10 is adjusted by the heat exchange plate 120, so that the battery cells can work in a relatively stable temperature environment.

[0062] In order to maintain the temperature control reliability of the heat exchange plate 120 on the battery cell and to protect the heat exchange plate 120, the embodiment of the present application is provided with an insulation component 130 on the outer wall of the heat exchange plate 120 (the side wall of the accommodating cavity facing away from the battery box 10). The insulation component 130 can be selected from foam materials such as polypropylene plastic. The insulation component 130 can not only reduce the heat exchange amount between the heat exchange plate 120 and the external air, but the buffering performance of the insulation component 130 can also provide stronger support for the heat exchange plate 120, thereby avoiding the heat exchange plate 120 from bending and deforming during the operation of the battery box 10, and ensuring that the battery cell 21 or the battery module 20 is always tightly fitted with the heat exchange plate 120, thereby improving the temperature control reliability of the battery box 10.

[0063] The battery case 10 provided in the embodiment of the present application takes into account both the insulation and protection effects on the heat exchange plate 120 through the insulation component 130, so there is no need to set a protective plate on the outer wall of the insulation component, thereby reducing the number of components of the battery case 10. At the same time, the low density performance of the insulation component 130 can also reduce the weight of the battery case 10, thereby improving the energy density of the battery case 10. The strong insulation performance of the insulation component 130 can also improve the insulation performance of the battery case 10. In addition, the ability of the bottom of the battery case 10 to resist external forces can be improved by increasing the thickness of the insulation component 130.

[0064] It should be noted that the embodiments of the present application include a heat exchange plate 120 disposed on the side wall of the battery box 10, and a heat exchange plate 120 disposed on the bottom of the battery box 10. The following will explain the heat exchange plate 120 disposed on the bottom of the battery box 10 as a preferred embodiment.

[0065] In some embodiments, the thermal insulation member 130 includes a foam layer, and the foam layer is sprayed onto the outer wall of the heat exchange plate 120 .

[0066] In this embodiment, the foaming layer can be selected from foaming materials such as polyurethane foam glue or polypropylene plastic. During the process of spraying the foaming layer onto the heat exchange plate 120, part of the foaming material can also fill the gap between the heat exchange plate 120 and the box body 110. During the process of locking and fixing the heat exchange plate 120 and the box body 110 by fasteners such as rivets, the compression rate of the foaming material is controlled by the pre-tightening force applied between the heat exchange plate 120 and the box body 110 by the fasteners. By controlling the compression rate of the foaming material, the purpose of improving the sealing between the heat exchange plate 120 and the box body 110 is achieved.

[0067] In the embodiment of the present application, the foam layer is integrated into the heat exchange plate 120 by spraying, and there is no need to assemble the foam layer and the heat exchange plate 120 separately, which reduces the types and number of parts of the battery box 10 and saves the installation step of the insulation member 130. Moreover, the foam layer and the heat exchange plate 120 are integrated together as a soft connection, and the foam layer can fill the gap between the foam layer and the heat exchange plate 120 to the maximum extent by its own expansion, so that condensed water or debris will not accumulate in the gap between the foam layer and the heat exchange plate 120 to affect the NVH performance of the whole vehicle.

[0068] In some embodiments, the thermal insulation component 130 includes a thermal insulation board, and the thermal insulation board is configured as an integrally formed structure.

[0069] In this embodiment, the thickness of the insulation plate can be reasonably designed so that the insulation plate can have both insulation and protection functions. The insulation plate with an integrally formed structure can be formed by thermoplastic molding or by machining. Compared with the metal protective plate in the prior art, the insulation plate has a small density, strong insulation and buffering properties, and can provide stronger support for the heat exchange plate 120, thereby preventing the heat exchange plate 120 from bending and deforming due to external force during the operation of the battery box 10.

[0070] The insulation plate of the embodiment of the present application not only reduces the types and quantities of parts of the battery box 10, but also can provide insulation and protection for the heat exchange plate 120. Moreover, the insulation plate is configured as an integrally formed structure, and no additional insulation plate needs to be assembled, thereby reducing the failure risk of various different connection interfaces.

[0071] In addition, the thermal insulation board of the integrally formed structure can not only play a role in heat insulation, but also buffer the hard contact between the heat exchange plate 120 and the external force. Since the thermal insulation board has structural integrity and a certain flexibility, when the bottom of the box 110 is subjected to external force impact, the thermal insulation board can buffer the external force impact through its own flexible deformation. When the external force disappears, the thermal insulation board can recover to its original state through its own structural integrity, thereby reducing the impact of external force impact on the normal use of the battery box 10. Compared with the foam layer and the split thermal insulation layer in the prior art, the foam layer and the split thermal insulation layer in the prior art are easily penetrated by the external force when subjected to external force impact due to lack of structural integrity, or the split thermal insulation layer is not easy to recover to its original state after being squeezed together by the external force. The damaged foam layer and the split thermal insulation layer after being squeezed and deformed will affect the normal use of the battery box 10, for example, affecting the normal heat dissipation, impact resistance and normal placement posture of the battery box 10.

[0072] In some embodiments, the thermal insulation board includes a heat insulation layer and a buffer protection layer, and the heat insulation layer and the buffer protection layer are arranged as an integrally formed structure.

[0073] In this embodiment, the insulation board includes a heat insulation layer and a buffer protection layer. The heat insulation layer is a low-density foamed polyurethane layer or other low thermal conductivity material (the specific data of the low density and low thermal conductivity depend on the specific application environment, as long as it can achieve the effects of heat insulation and weight reduction relative to the battery case of the prior art. The specific data of the low density and low thermal conductivity are not disclosed here), and the buffer protection layer is a PP honeycomb layer (a plate made of two thinner polypropylene panels firmly bonded to both sides of a thicker honeycomb core material). The low-density foamed polyurethane layer is located on the top of the PP honeycomb layer, which not only has an insulation effect on the battery case 10, but also can further produce a buffering effect on the impact to improve the protection performance of the battery case 10, thereby enhancing the impact resistance of the battery case 10.

[0074] When assembling the battery box 10, after the heat exchange plate 120 is installed, the PP honeycomb layer and the low-density polyurethane layer are assembled on the bottom of the heat exchange plate 120 by bonding, riveting or clamping. Specifically, the embodiment of the present application makes a specific mold according to the structural relationship between the box 110 and the battery module 20, preheats the mold so that the surface temperature of the mold reaches the melting point of the PP honeycomb layer, fills the low-density foamed polyurethane material into the mold, passes steam three times, cools, demoulds, and dries to form an integrated insulation board.

[0075] In some embodiments, see Figure 7 and Figure 8 As shown, the inner wall of the heat preservation plate is in close contact with the outer wall of the heat exchange plate 120 , and / or the edge profile of the heat preservation plate matches the edge profile of the heat exchange plate 120 .

[0076] In this embodiment, the inner wall of the insulation plate (the side facing the heat exchange plate 120) is close to the outer wall of the heat exchange plate 120, including the insulation plate filling the gap between the insulation plate and the heat exchange plate 120 through its own flexible deformation or expansion, thereby reducing the phenomenon that condensation water or debris accumulates in the gap between the insulation plate and the heat exchange plate 120 and affects the NVH performance of the entire vehicle.

[0077] The edge contour of the insulation plate matches the edge contour of the heat exchange plate 120 so that the insulation plate can completely cover the heat exchange plate 120. Since the thermal insulation performance of the insulation plate is better than the thermal insulation performance of the air, that is, its thermal conductivity is lower than the thermal conductivity of the air, increasing the degree of fit between the insulation plate and the heat exchange plate 120 can further improve the thermal insulation performance of the insulation plate and reduce the heat loss of the heat exchange plate 120.

[0078] In some embodiments, Figure 8 and Fig. 9 As shown, the heat exchange plate 120 is configured as a liquid cooling plate, and the outer wall of the liquid cooling plate is provided with a flow channel protrusion 121, and the inner wall of the heat preservation plate is provided with a groove 132 that cooperates with the flow channel protrusion 121.

[0079] In this embodiment, the interior of the heat exchange plate 120 is configured as a hollow structure, and the hollow structure forms a plurality of flow channel protrusions 121 that are distributed in a circuitous manner. The refrigerant flows in a circuitous manner inside the plurality of flow channel protrusions 121, so as to achieve the purpose of heat exchange inside the battery box 10. The plurality of flow channel protrusions 121 protrude from the outer wall of the heat exchange plate 120, and the inner wall of the plate body 131 of the insulation plate is provided with a groove 132 that cooperates with the flow channel protrusion 121. The insulation plate is arranged close to the flow channel protrusion 121 of the heat exchange plate 120 through the groove 132.

[0080] By setting the inner wall profile of the insulation plate to match the outer wall profile of the heat exchange plate 120, the cavity volume between the insulation plate and the heat exchange plate 120 can be reduced, and the contact area between the insulation plate and the heat exchange plate 120 can be increased. Since the thermal insulation performance of the insulation plate is better than the thermal insulation performance of the air, that is, its thermal conductivity is lower than the thermal conductivity of the air, increasing the contact area between the insulation plate and the liquid cooling plate can further improve the thermal insulation performance of the foam plate.

[0081] In some embodiments, Figure 5 As shown, a flexible pad 140 is laid on the bottom of the box body 110 , and the heat exchange plate 120 covers the outer wall of the flexible pad 140 .

[0082] In this embodiment, since the heat exchange plate 120 is arranged at the bottom of the box body 110, the battery cells or battery modules in the battery box body 10 can use their own gravity to move closer to the heat exchange plate 120, thereby improving the heat exchange effect between the battery cells or battery modules and the heat exchange plate 120. The purpose of adjusting the temperature of the battery cells or battery modules is achieved through the heat exchange plate 120, thereby reducing the impact of high temperature and low temperature environments on the battery cells.

[0083] Furthermore, in order to buffer the hard contact between the battery cell or battery module and the heat exchange plate 120, the embodiment of the present application also proposes to set a flexible pad 140 (such as a silicone pad) between the battery cell or battery module and the heat exchange plate 120, and the flexible pad 140 buffers the external force, thereby reducing the risk of the battery cell or battery module being damaged due to hard collision.

[0084] In some embodiments, a snap-in groove is provided at the bottom of the box body 110, and at least a portion of the thermal insulation component 130 is embedded in the snap-in groove (not shown in the figure).

[0085] In this embodiment, Figure 5-Figure 8 Taking the battery box shown as an example, the bottom of the battery box 10 includes a beam frame 101, a frame 102 and a heat exchange plate 120. The frame 102 is arranged around the beam frame 101, and the heat exchange plate 120 is arranged on the outside of the bottom of the beam frame 101. The clamping groove is arranged on the beam frame 101, the frame 102 or the heat exchange plate 120. At least part of the thermal insulation member 130 is filled into the clamping groove at the bottom of the battery box 10, so as to improve the bottom strength and rigidity of the battery box 10, and at the same time, reduce the weight of the battery box 10, so as to achieve the lightweight of the entire battery box 10. In addition, the battery box 10 filled with the thermal insulation member 130 can improve the thermal insulation effect of the battery box 10.

[0086] It should be noted that embedding the thermal insulation component 130 into the heat exchange plate 120 or the box 110 is only a preferred embodiment of the present application, and is not a limitation on the fixing method of the thermal insulation component 130. For example, in other embodiments of the present application, the thermal insulation component 130 may also be bonded to the heat exchange plate 120, or the mounting portion 133 of the thermal insulation component 130 may be assembled to the heat exchange plate 120 and / or the box 110 by fasteners. Specifically, the thermal insulation component 130 is directly fixed to the bottom of the heat exchange plate 120 by means of structural adhesive, double-sided adhesive or fasteners, so as to improve the impact resistance of the bottom of the battery box 10, and at the same time, the thermal insulation function of the heat exchange plate 120 can be realized, and the energy loss of the heat exchange plate 120 can be reduced.

[0087] It should be noted that the battery box 10 of the embodiment of the present application can be Figure 2 The structure shown can also be Figure 5-Figure 8The structures shown in the figure, both structures belong to the protection scope of the embodiments of the present application, and the following Figure 5-Figure 8 The battery housing 10 shown is explained in detail.

[0088] In some embodiments, Figure 5 As shown, the box body 110 includes a beam frame and a frame 102 circumferentially arranged around the beam frame 101 , and at least a portion of the thermal insulation member 130 is assembled to the beam frame 101 and / or the frame 102 .

[0089] In this embodiment, at least a portion of the thermal insulation component 130 is assembled to the beam frame 101 and / or the frame 102 by means of adhesive or fasteners, so that the thermal insulation component 130 is arranged close to the heat exchange plate 120, thereby improving the temperature control and protection effect of the thermal insulation component 130 on the heat exchange plate 120, and reducing the gap formed between the heat exchange plate 120 and the thermal insulation component 130 to affect the performance of the battery box 10.

[0090] Furthermore, the beam frame 101 is fixed to the inner side of the two side frames 102 by fasteners, and the beam frame 101 includes a longitudinal beam located in the middle and a plurality of equally spaced transverse beams, one end of the transverse beam is fixed to the longitudinal beam by fasteners, and the other end is fixed to the inner side of the two side frames 102 by fasteners, and the longitudinal beam and the plurality of equally spaced transverse beams form a plurality of placement slots for placing a plurality of battery cells 21 or battery modules 20.

[0091] The beam 101 is connected to the frame 102 by rivets through a connecting piece, which can reduce the amount of welding and welding deformation. The heat exchange plate 120 is connected to the frame 102 and the beam 101 by screws, and the thermal insulation component 130 of the embodiment of the present application can effectively reduce the heat radiation of the heat exchange plate 120, reduce the energy consumption of the product, and improve the temperature consistency of the battery. The frame 102 can also be sealed with thermal insulation materials to reduce the heat dissipation area of ​​the frame 102 and reduce the heat of the battery through the frame 102 to exchange heat with the external air.

[0092] Furthermore, a blocking block is provided between two adjacent frames 102. The blocking block is preferably made by spraying or filling the thermal insulation component 130 of the embodiment of the present application, and is used to block the cavity opening between two adjacent frames 102, reduce the heat dissipation area of ​​the frames 102, prevent the loss of battery heat, and further enhance the protective effect of the battery box 10 on the battery cell.

[0093] The heat exchange plate 120 is preferably a liquid cooling plate, which is welded to the bottom of the box 110 by brazing. It is formed by a blowing process. A water nozzle is welded at the bottom of the box 110 for the refrigerant in and out of the liquid cooling plate, forming a liquid cooling circuit with the liquid cooling plate below, which is used to control the temperature of the battery cells inside the battery box 10.

[0094] The second aspect of the present application provides a battery, the battery 100 includes at least one battery cell 21 or a battery module 20 and a battery case 10 according to the first aspect of the present application, and the at least one battery cell 21 or the battery module 20 is arranged in the accommodating space of the battery case 10.

[0095] In this embodiment, the battery 100 includes a battery case 10, a sealing cover and a plurality of battery modules 20 of the first aspect of the present application. The battery case 10 and the sealing cover cooperate to form a battery accommodating cavity. The battery module 20 is installed in the battery accommodating cavity. The sealing cover is arranged above the battery module 20 and the battery case 10. The sealing cover is installed on the battery case 10 through a connecting component.

[0096] A third aspect of the present application provides an electrical device, the electrical device comprising the battery according to the second aspect of the present application.

[0097] The following describes the stress conditions of the battery box 10 in actual application scenarios through some preferred embodiments of the present application.

[0098] Taking an electric vehicle as an example of an electrical equipment, in the normal operation scenario of the electric vehicle, the battery box 10 controls the temperature balance of the battery box 10 through the insulation part 130. In the vehicle collision scenario of the electric vehicle, when the bottom of the battery box 10 is subjected to the collision force, the insulation part 130 can withstand and buffer the collision force, thereby reducing the tilting and deformation of the heat exchange plate 120 under the action of the collision force, thereby reducing the risk of the heat exchange plate 120 tilting inward and squeezing the battery cell 21 or the battery module 20, thereby improving the collision safety performance of the battery box 10.

[0099] The embodiment provided in the present application improves the thermal insulation and protective safety performance of the battery box 10 by taking into account the protective effect of the protective plate through the thermal insulation component 130. Therefore, there is no need to add a protective plate made of metal material on the outside of the thermal insulation component 130, thereby reducing the weight and number of components of the battery box 10 and reducing the impact of the structural modification of the battery box 10 on the cost.

[0100] 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 them; although the present application is described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific disclosed herein.

[0101] Embodiments, but include all technical solutions that fall within the scope of the claims. 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 is described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that it is still possible to modify the technical solutions recorded in the aforementioned embodiments, or to replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery box, characterized in that: The battery box comprises: Box; A heat exchange plate, wherein the heat exchange plate is arranged at the bottom of the box; A heat-insulating member, wherein the heat-insulating member covers the outer wall of the heat exchange plate, and the outer wall of the heat-insulating member constitutes the outer wall of the battery box. The thermal insulation component comprises a thermal insulation board, the thermal insulation board comprises a heat insulation layer and a buffer protection layer, the heat insulation layer and the buffer protection layer are arranged as an integrally formed structure, the heat insulation layer comprises a foamed polyurethane layer, and the buffer protection layer comprises a PP honeycomb layer.

2. The battery box according to claim 1, characterized in that: The inner wall of the heat-insulating plate is in close contact with the outer wall of the heat-exchanging plate, and / or the edge contour of the heat-insulating plate matches the edge contour of the heat-exchanging plate.

3. The battery box according to claim 1, characterized in that: The heat exchange plate is configured as a liquid cooling plate, the outer wall of the liquid cooling plate is provided with a flow channel protrusion, and the inner wall of the heat preservation plate is provided with a groove matched with the flow channel protrusion.

4. The battery box according to any one of claims 1 to 3, characterized in that: A flexible pad is laid on the bottom of the box body, and the heat exchange plate covers the outer wall of the flexible pad.

5. The battery case according to any one of claims 1 to 3, characterized in that: The bottom of the box body is provided with a clamping groove, and at least a part of the heat-insulating component is embedded in the clamping groove.

6. The battery case according to any one of claims 1 to 3, characterized in that: The box body comprises a beam frame and a frame arranged circumferentially around the beam frame, and at least a part of the thermal insulation component is assembled to the beam frame and / or the frame.

7. A battery, characterized in that: The battery comprises: At least one battery cell or battery module; According to the battery case according to any one of claims 1 to 6, at least one of the battery cells or the battery module is arranged in the accommodating space of the battery case.

8. An electrical device, characterized in that: The electric device comprises the battery according to claim 7.

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