Battery device and electric equipment

Abstract

The utility model relates to the technical field of battery production, in particular to a battery device and electric equipment. The battery device comprises a battery box body, a battery monomer and a heat management assembly, wherein the battery box body is provided with an accommodating space; the battery monomers are arranged in the accommodating space; the heat management assembly comprises a heat exchange part, the heat exchange part is arranged in the accommodating space, a protective layer is arranged between the heat exchange part and the battery monomers, the heat exchange part is configured to exchange heat with the battery monomers, and the protective layer is used for isolating emissions of the battery monomers from the heat exchange part. According to the battery device, the battery box body, the battery monomers and the heat management assembly are arranged, the heat management assembly comprises the heat exchange part, the heat exchange part is configured to exchange heat with the battery monomers, and the protection layer is used for isolating emissions of the battery monomers from the heat exchange part, so that when the battery device is subjected to thermal runaway, the emissions of the battery monomers can be isolated through the protection layer; the impact of emissions on the heat exchange piece is reduced, the heat exchange piece is protected, and therefore the probability that the heat exchange piece is damaged is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of battery production, and in particular to a battery device and electrical equipment. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] As new energy technologies mature, new energy vehicles and other electrical equipment are gradually entering the public eye. The core technology of new energy vehicles lies in the battery system, and the safety and stability of the battery system directly determine the performance of the entire vehicle.

[0004] A battery device typically includes a battery cell and a thermal management component for thermally managing the battery cell. The thermal management component includes a heat exchanger. The heat exchanger can be made of plastic, which has a series of advantages such as light weight, simple molding, and low cost. However, heat exchangers made of this material are prone to damage when thermal runaway occurs in the battery device. Utility Model Content

[0005] In view of the above problems, the present application provides a battery device and an electrical device, which solves the problem in the prior art that heat exchange components made of plastic materials are easily damaged when thermal runaway occurs in the battery device.

[0006] A first aspect of an embodiment of the present application provides a battery device, the battery device comprising:

[0007] A battery box having a storage space;

[0008] A battery cell, the battery cell being disposed in the accommodation space; and

[0009] The thermal management component includes a heat exchanger, which is arranged in the accommodation space. A protective layer is provided between the heat exchanger and the battery cell. The heat exchanger is configured to exchange heat with the battery cell. The protective layer is used to isolate the emissions from the battery cell from the heat exchanger.

[0010] The battery device of the embodiment of the present application is provided with a battery case, a battery cell and a thermal management component, wherein the battery case has a accommodating space, the battery cell is arranged in the accommodating space, the thermal management component includes a heat exchanger, the heat exchanger is configured to exchange heat with the battery cell, and the protective layer is used to isolate the emissions of the battery cell from the heat exchanger. When thermal runaway occurs in the battery device, the emissions of the battery cell can be isolated by the protective layer, reducing the impact of the emissions on the heat exchanger, forming protection for the heat exchanger, thereby reducing the chance of damage to the heat exchanger.

[0011] In some embodiments of the present application, the melting point of the protective layer is greater than the melting point of the heat exchange element.

[0012] In the embodiments of the present application, by making the melting point of the protective layer greater than the melting point of the heat exchanger, the protective layer can better block the emissions of the battery cells than the heat exchanger and is less likely to be damaged, thereby providing better protection for the heat exchanger.

[0013] In some embodiments of the present application, the protective layer is provided on at least a portion of the surface of the heat exchange element facing the battery cell, and / or the protective layer is provided on at least a portion of the surface of the battery cell facing the heat exchange element.

[0014] In the embodiments of the present application, by providing a protective layer on at least a portion of the surface of the heat exchange element facing the battery cell, the protective layer can be provided on the heat exchange element, thereby reducing the space occupied by the protective layer compared to a structure in which the protective layer is provided independently. In addition, by providing a protective layer on at least a portion of the surface of the battery cell facing the heat exchange element, the embodiment of the present application can reduce the space occupied by the protective layer compared to a structure in which the protective layer is provided independently.

[0015] In some embodiments of the present application, the melting point of the protective layer is greater than the maximum temperature of thermal runaway of the battery device.

[0016] In the embodiments of the present application, by setting the melting point of the protective layer higher than the maximum temperature of thermal runaway of the battery device, the protective layer will not be damaged when thermal runaway occurs in the battery device, thereby enabling the protective layer to effectively protect the heat exchange component and reduce the chance of damage to the heat exchange component.

[0017] In some embodiments of the present application, the protective layer is a coating structure.

[0018] In the embodiments of the present application, by setting the protective layer as a coating structure, the protective layer and the heat exchanger can be set as an integrated structure, which reduces the assembly process of the battery device and can reduce the probability of the protective layer falling off the heat exchanger. And / or, the protective layer and the battery cell can be set as an integrated structure, which reduces the assembly process of the battery device and can reduce the probability of the protective layer falling off the battery cell. In addition, if the protective layer is a coating structure, a high melting point material can be sprayed onto the heat exchanger to obtain a uniform coating structure as a protective layer, thereby achieving a uniform temperature isolation effect, and / or, if the protective layer is a coating structure, a high melting point material can be sprayed onto the battery cell to obtain a uniform coating structure as a protective layer, thereby achieving a uniform temperature isolation effect.

[0019] In some embodiments of the present application, the coating structure includes at least one of a chromium nitride coating, a titanium nitride coating, a silicon carbide coating, a zirconium dioxide coating, an iridium-based coating, an aluminum phosphide coating, and a ceramic coating.

[0020] The embodiments of the present application, by making the coating structure include at least one of chromium nitride coating, titanium nitride coating, silicon carbide coating, zirconium dioxide coating, iridium-based coating, aluminum phosphide coating and ceramic coating, can utilize the high melting point characteristics of chromium nitride coating, titanium nitride coating, silicon carbide coating, zirconium dioxide coating, iridium-based coating, aluminum phosphide coating and ceramic coating to protect the heat exchanger, thereby reducing the chance of damage to the heat exchanger.

[0021] In some embodiments of the present application, the coating structure is formed on at least a portion of the surface of the battery cell by at least one of roller coating, brush coating and spray coating; and / or the coating structure is formed on at least a portion of the surface of the heat exchange component by at least one of roller coating, brush coating and spray coating.

[0022] In the embodiments of the present application, a coating structure is formed on at least a portion of the surface of a battery cell by at least one of roller coating, brush coating and spray coating; and / or a coating structure is formed on at least a portion of the surface of a heat exchanger by at least one of roller coating, brush coating and spray coating. Then, the coating structure can be applied to the heat exchanger and / or battery cell by at least one of roller coating, brush coating and spray coating, thereby processing a coating structure on the surface of the heat exchanger and / or battery cell.

[0023] In some embodiments of the present application, the thickness of the protective layer is smaller than the thickness of the heat exchange element.

[0024] In the embodiments of the present application, by making the thickness of the protective layer smaller than the thickness of the heat exchange element, the thickness of the protective layer will not affect the normal assembly and packaging of the battery device due to being too thick. By reasonably setting the thickness of the protective layer, the functionality and applicability of the protective layer can be taken into account.

[0025] In some embodiments of the present application, the thickness of the protective layer is T1, and the thickness of the heat exchange element is T2, wherein 0.01*T2≤T1≤0.1*T2.

[0026] In the embodiment of the present application, the thickness of the protective layer is set to T1 and the thickness of the heat exchange element is set to T2, wherein 0.01*T2≤T1≤0.1*T2. Then, the thickness of the protective layer can be determined according to the thickness of the heat exchange element.

[0027] In some embodiments of the present application, the thickness of the protective layer is T1, 1 micron≤T1≤500 microns.

[0028] In the embodiment of the present application, the thickness of the protective layer is set to T1, where 1 micron ≤ T1 ≤ 500 microns. A common spraying method can be used. The thickness of the protective layer can be controlled through a single spraying, thereby improving the spraying efficiency of the protective layer.

[0029] In some embodiments of the present application, the protective layer is a heat conductive member.

[0030] In the embodiment of the present application, by setting the protective layer as a heat conductive member, heat exchange between the battery cell and the heat exchange member can be achieved, thereby reducing the impact of the protective layer on the heat exchange efficiency of the battery device.

[0031] In some embodiments of the present application, a heat exchange element is provided below the battery cell in the direction of gravity, and / or a heat exchange element is provided on the side of the battery cell.

[0032] In the embodiments of the present application, by providing a heat exchange element below the battery cell in the direction of gravity, and / or providing a heat exchange element on the side of the battery cell, the protective layer can be provided below and / or on the side of the battery cell, and the protective layer can be conveniently provided on the surface of the heat exchange element facing the battery cell, thereby improving the processing efficiency of the protective layer.

[0033] A second aspect of the present application provides an electrical device, which includes the battery device mentioned in the above embodiment, and the battery device is used to supply power to the electrical device.

[0034] 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

[0035] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0036] Figure 1 A schematic diagram of the structure of an electrical device provided in some embodiments of the present application;

[0037] Figure 2 A schematic structural diagram of a battery device provided in some embodiments of the present application;

[0038] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the battery device shown in (partial structure);

[0039] Figure 4 A schematic diagram of the structure of a heat exchange component provided in some embodiments of the present application;

[0040] Figure 5 for Figure 4 Schematic diagram of the structure of the heat exchange element shown in the second viewing angle.

[0041] The reference numerals are as follows:

[0042] 1000, vehicle; 100, battery device; 200, controller; 300, motor;

[0043] 10. Battery cells;

[0044] 20. Battery box; 21. First box; 211. First plate; 212. Second plate; 22. Second box; 23. Accommodation space;

[0045] 30. Thermal management components; 31. Heat exchange components; 32. Current collectors;

[0046] 40. Protective layer;

[0047] XX, length direction of the battery device;

[0048] YY, width direction of the battery device;

[0049] ZZ, height direction of the battery device;

[0050] T1, thickness of protective layer;

[0051] T2. Thickness of heat exchanger. DETAILED DESCRIPTION

[0052] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art 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" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0054] In the description of the embodiments of this application, the technical terms "first," "second," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0055] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0056] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0057] 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).

[0058] 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" and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0060] Currently, market developments indicate that battery applications are becoming increasingly widespread. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0061] The battery device involved in the embodiments of the present application can be used, but is not limited to, in electrical equipment such as vehicles, ships, or aircraft. The battery device can be composed of the battery cells, battery devices, etc. involved in the present application.

[0062] In the embodiments of the present application, the electrical devices using the battery device as a power source may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all batteries including battery boxes and electrical equipment using batteries.

[0064] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0065] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0066] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing multiple battery cells to form an independent module. As an example, the battery module may be formed by bundling multiple battery cells with a cable tie.

[0067] In some embodiments, the battery device may be a battery pack, which includes a battery case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the battery case.

[0068] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in a battery box by fixing the battery module in the box.

[0069] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0070] As an example, a battery case may include a first case and a second case. The first and second cases snap together to form an enclosed space within the battery case to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first case may be a top cover or a bottom plate.

[0071] As an example, a battery case may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame to form a closed space inside the case to accommodate the battery cell assembly.

[0072] In some embodiments, the battery box can be used as part of the chassis structure of the vehicle. For example, part of the battery box can become at least a part of the floor of the vehicle, or part of the battery box can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0073] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly consists of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer. The current collectors uncoated with the positive active material layer, when stacked, serve as the positive electrode tabs. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer. The current collectors uncoated with the negative active material layer, when stacked, serve as the negative electrode tabs. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0074] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0075] A battery device typically includes a battery cell and a thermal management component for thermally managing the battery cell. The thermal management component includes a heat exchanger. The heat exchanger can be made of plastic, which has a series of advantages such as light weight, simple molding, and low cost. However, heat exchangers made of this material are prone to damage when thermal runaway occurs in the battery device.

[0076] To address this issue, embodiments of the present application propose a battery device comprising a battery case, battery cells, and a thermal management assembly. The battery case has a storage space; the battery cells are located in the storage space; and the thermal management assembly includes a heat exchanger located in the storage space. A protective layer is provided between the heat exchanger and the battery cells. The heat exchanger is configured to exchange heat with the battery cells, and the protective layer is used to isolate the heat exchanger from the battery cell emissions. In the event of thermal runaway in the battery device, the protective layer, with its higher melting point, blocks the impact of heat on the heat exchanger, protecting it and reducing the chance of damage.

[0077] The battery device in the embodiment of the present application can be used on electrical equipment such as vehicles, and can also be installed on electrical equipment that requires the battery device to be installed in advance.

[0078] The structure in the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0079] Combine Figure 1 As shown, the vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0080] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0081] like Figure 2 As shown, an embodiment of the present application further provides a battery device 100 , including a battery case 20 and a battery cell 10 . A receiving space 23 is provided in the battery case 20 , and the battery cell 10 is installed in the receiving space 23 .

[0082] In some embodiments, as Figure 2 As shown, the battery case 20 may include a first case 21 and a second case 22, which cover each other and together define a storage space 23 for accommodating the battery cells 10. The first case 21 and the second case 22 may each be a hollow structure with one end open, with the second case 22 covering the open side of the first case 21, so that the first case 21 and the second case 22 together define a storage space. Alternatively, the second case 22 may be a plate-like structure, the first case 21 may be a hollow structure with one end open, with the open side of the second case 22 covering the open side of the first case 21. Of course, the battery case 20 formed by the first case 21 and the second case 22 may have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0083] It should be noted that the first box body 21 includes a first plate body 211 and a second plate body 212 , wherein the first plate body 211 is a bottom plate, the second plate body 212 is a side plate, and the second plate body 212 and the first plate body 211 enclose an accommodating space 23 .

[0084] The battery cell 10 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be cylindrical, flat, rectangular, or in other shapes.

[0085] like Figure 3 As shown, the battery device 100 also includes a thermal management component 30, which includes a heat exchanger 31. The heat exchanger 31 is arranged in the accommodating space 23 and is configured to exchange heat with the battery cell 10. A protective layer 40 is provided between the heat exchanger 31 and the battery cell 10. The protective layer 40 is used to isolate the emissions of the battery cell 10 from the heat exchanger 31.

[0086] It should be noted that the thermal management here should be understood as the heat between the heat exchanger 31 and the battery cell 10 can be transferred between the two. For example, the heat exchanger 31 is in direct contact with the battery cell 10 to achieve contact heat exchange, or a heat-conducting structure (such as thermally conductive glue) is set between the heat exchanger 31 and the battery cell 10 for heat exchange. Specifically, the heat exchanger 31 dissipates heat and cools or heats the battery cell 10, controls the temperature of the battery cell 10 within an appropriate range, and improves the service life and safety performance of the battery cell 10. In addition, when a battery cell 10 experiences thermal runaway, the heat generated by the thermally runaway battery cell 10 will be taken away by the heat exchanger 31 in contact with it, reducing the temperature of the thermally runaway battery cell 10 and avoiding thermal runaway of the adjacent battery cell 10, thereby ensuring the safety performance of the battery device 100. The heat exchanger 31 can be used to perform thermal management on the battery cell 10 to ensure that the battery cell 10 is within an appropriate temperature range, thereby ensuring the safety performance of the battery device 100.

[0087] The emissions from the battery cell 10 include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, separator fragments, high-temperature and high-pressure gas generated by the reaction, flames, etc. The temperature of the emissions is relatively high and has a greater impact capacity.

[0088] The heat exchanger 31 is usually made of plastic, and its melting point is usually in the range of 100 to 300°C. When the battery device 100 experiences thermal runaway, the maximum temperature of thermal runaway can reach 1000°C. The heat exchanger 31 is easily damaged when the battery device 100 experiences thermal runaway. Therefore,

[0089] The battery device 100 of an embodiment of the present application is provided with a battery case, a battery cell 10 and a thermal management component 30, wherein the battery case 20 has a accommodating space 23, the battery cell 10 is arranged in the accommodating space 23, and the thermal management component 30 includes a heat exchanger 31, the heat exchanger 31 is arranged in the accommodating space 23 and is configured to exchange heat with the battery cell 10, and a protective layer 40 is provided between the heat exchanger 31 and the battery cell 10. When thermal runaway occurs in the battery device 100, the protective layer 40 blocks the impact of the emissions from the battery cell 10 on the heat exchanger 31, thereby protecting the heat exchanger 31 and reducing the probability of damage to the heat exchanger 31.

[0090] In this embodiment, when the melting point of the protective layer 40 is the same as that of the heat exchange element 31 , the protective layer 40 can also protect the heat exchange element 31 .

[0091] Optionally, the melting point of the protective layer 40 is greater than the melting point of the heat exchange element 31 .

[0092] The melting point of the protective layer 40 should be greater than that of the heat exchanger 31 to better protect the heat exchanger 31. The protective layer 40 can be made of a high-temperature resistant material with both high-temperature resistance and thermal conductivity, such as ceramic or chromium nitride. The heat exchanger 31 is typically made of a plastic material, such as polyvinyl chloride or polypropylene.

[0093] In the embodiment of the present application, by making the melting point of the protective layer 40 greater than the melting point of the heat exchanger 31, the protective layer 40 can better block the emissions of the battery cell 10 compared to the heat exchanger 31 due to its higher melting point. The protective layer 40 is less likely to be damaged, thereby providing better protection for the heat exchanger 31.

[0094] Optionally, the protective layer 40 can be arranged between the heat exchanger 31 and the battery cell 10 in various ways. For example, the protective layer 40 can be independently arranged between the heat exchanger 31 and the battery cell 10, with a gap between the protective layer 40 and the heat exchanger 31, and a gap between the protective layer 40 and the battery cell 10. In this case, additional components can be provided to fix the protective layer 40. Alternatively, the protective layer 40 can also be arranged on at least a portion of the surface of the heat exchanger 31 facing the battery cell 10. In this case, the protective layer 40 and the heat exchanger 31 are in contact with each other. Alternatively, the protective layer 40 can be arranged on at least a portion of the surface of the battery cell 10 facing the heat exchanger 31. The protective layer 40 and the battery cell 10 are in contact with each other.

[0095] Alternatively, the surface of the battery cell 10 facing the heat exchange element 31 is provided with a protective layer 40 , and the surface of the heat exchange element 31 facing the battery cell 10 is also provided with a protective layer 40 , which can better reduce the probability of damage to the heat exchange element 31 .

[0096] In the embodiments of the present application, the protective layer 40 is disposed on at least a portion of the surface of the heat exchange element 31 facing the battery cell 10. This allows the protective layer 40 to be disposed on the heat exchange element 31, thereby reducing the space occupied by the protective layer 40 compared to a structure in which the protective layer 40 is disposed independently. Furthermore, in the embodiments of the present application, the protective layer 40 is disposed on at least a portion of the surface of the battery cell 10 facing the heat exchange element 31, thereby reducing the space occupied by the protective layer 40 compared to a structure in which the protective layer 40 is disposed independently.

[0097] Optionally, the melting point of the protective layer 40 is greater than the maximum temperature of thermal runaway of the battery device 100 .

[0098] We mentioned earlier that the melting point of the protective layer 40 is greater than the melting point of the heat exchanger 31. At this time, there are many options for the material of the protective layer 40. For example, the protective layer 40 selects a material with a melting point of 500 to 900°C. However, considering that the battery device 100 may experience thermal runaway, when selecting the material of the protective layer 40, the melting point of the protective layer 40 can be greater than the maximum thermal runaway temperature of the battery device 100. This ensures that the protective layer 40 will not be damaged when the battery device 100 experiences thermal runaway, and can also ensure that the protective layer 40 can still protect the heat exchanger 31 when the battery device 100 experiences thermal runaway, thereby reducing the chance of damage to the heat exchanger 31.

[0099] In the embodiment of the present application, by setting the melting point of the protective layer 40 to be greater than the maximum temperature of thermal runaway of the battery device 100, the protective layer 40 will not be damaged when thermal runaway occurs in the battery device 100. As a result, the protective layer 40 can effectively protect the heat exchange element 31 and reduce the probability of damage to the heat exchange element 31.

[0100] Optionally, the protective layer 40 is a coating structure.

[0101] The coating structure mentioned here means that the protective layer 40 exists in the form of a coating, which can be obtained by a spraying process.

[0102] In the embodiment of the present application, by configuring the protective layer 40 as a coating structure, the protective layer 40 and the heat exchanger 31 can be configured as an integrated structure, thereby reducing the assembly process of the battery device 100 and reducing the probability of the protective layer 40 falling off the heat exchanger 31. And / or, the protective layer 40 and the battery cell 10 can be configured as an integrated structure, thereby reducing the assembly process of the battery device 100 and reducing the probability of the protective layer 40 falling off the battery cell 10. In addition, if the protective layer 40 is a coating structure, a high-melting-point material can be sprayed onto the heat exchanger 31 by spraying to obtain a uniform coating structure as the protective layer 40, thereby achieving a uniform temperature isolation effect, and / or, if the protective layer 40 is a coating structure, a high-melting-point material can be sprayed onto the battery cell 10 by spraying to obtain a uniform coating structure as the protective layer 40, thereby achieving a uniform temperature isolation effect.

[0103] Optionally, the coating structure includes at least one of a chromium nitride coating, a titanium nitride coating, a silicon carbide coating, a zirconium dioxide coating, an iridium-based coating, an aluminum phosphide coating, and a ceramic coating.

[0104] It is important to note that chromium nitride coatings are highly valued wear-resistant coatings due to their high hardness and excellent wear resistance. They are also thermally conductive, with a melting point of 1650°C, and can be used as the material for protective layer 40. Titanium nitride is a compound with a high melting point, high hardness, high-temperature chemical stability, and excellent thermal and electrical conductivity. Its melting point is 2950°C, and it can be used as the material for protective layer 40. Silicon carbide, as an excellent ceramic material, has extremely high thermal conductivity. Its melting point is 2700°C, and it can be used as the material for protective layer 40. Zirconium dioxide coatings have low thermal conductivity and a melting point of 2715°C, and can be used as the material for protective layer 40. Iridium-based coatings have good thermal conductivity and a melting point of 2454°C, and can be used as the material for protective layer 40. Aluminum phosphide coatings have thermal conductivity and a melting point of 2000°C, and can be used as the material for protective layer 40. There are many materials to choose from for the ceramic coating, such as oxide ceramics, carbide ceramics, nitride ceramics, boride ceramics, etc. All of them have melting points above 2000° C. and have good thermal conductivity, and can be used as the material of the protective layer 40 .

[0105] It should be emphasized that the coating structure here can be a single-layer structure or a multi-layer structure. For example, the coating structure can be one of these coatings, or a two-layer structure, such as the first layer is a chromium nitride coating and the second layer is a titanium nitride coating. Correspondingly, it can also be a three-layer or more-layer structure, such as the first layer is a chromium nitride coating, the second layer is a titanium nitride coating, and the third layer is a silicon carbide coating.

[0106] The embodiments of the present application can utilize the high melting point characteristics of chromium nitride coating, titanium nitride coating, silicon carbide coating, zirconium dioxide coating, iridium-based coating, aluminum phosphide coating and ceramic coating to protect the heat exchanger 31, thereby reducing the chance of damage to the heat exchanger 31.

[0107] Optionally, the coating structure is formed on at least a portion of the surface of the battery cell by at least one of roller coating, brush coating and spray coating; and / or the coating structure is formed on at least a portion of the surface of the heat exchanger by at least one of roller coating, brush coating and spray coating.

[0108] Roller coating uses a roller as a carrier for the paint. The paint forms a wet film of a certain thickness on the surface of the roller. The roller then contacts the object to be coated during rotation, applying the paint to the surface of the object, achieving high efficiency and large-area coating effects.

[0109] Brushing is a method of using various paintbrushes and paintbrushes to apply paint on the surface of the product to form a uniform coating. It is one of the earliest and most commonly used coating methods. Its advantages are that it requires almost no investment in equipment and fixtures, saves coating materials, and generally does not require a masking process.

[0110] Spraying is a coating method that uses a spray gun or disc atomizer to disperse the spray into uniform and fine droplets with the help of pressure or centrifugal force and apply it to the surface of the object. It has the advantages of high efficiency, uniformity and strong applicability.

[0111] The coating structure here can be realized by using at least one of the above methods.

[0112] In the embodiments of the present application, a coating structure is formed on at least a portion of the surface of the battery cell 10 by at least one of roller coating, brush coating and spray coating, and / or a coating structure is formed on at least a portion of the surface of the heat exchanger 31 by at least one of roller coating, brush coating and spray coating. Then, the coating structure can be applied to the heat exchanger 31 and / or the battery cell 10 by at least one of roller coating, brush coating and spray coating, thereby processing a coating structure on the surface of the heat exchanger 31 and / or the battery cell 10.

[0113] Alternatively, as Figure 4 and Figure 5 As shown, the thickness of the protective layer 40 is smaller than the thickness of the heat exchange element 31 .

[0114] The heat exchange element 31 here can typically be a heat exchange plate structure, wherein the heat exchange plate is a hollow structure that allows fluid to flow inside. The thickness of the heat exchange element 31 refers to the total thickness of the heat exchange element 31, which is typically measured in millimeters, such as 5 mm or 6 mm. The protective layer 40 is a solid structure and is typically thin.

[0115] In the embodiment of the present application, the thickness of the protective layer 40 is smaller than the thickness of the heat exchange element 31, so that the thickness of the protective layer 40 will not affect the normal assembly and packaging of the battery device 100 due to being too thick. By reasonably setting the thickness of the protective layer 40, the functionality and applicability of the protective layer 40 can be taken into account.

[0116] Alternatively, as Figure 4 and Figure 5 As shown, the thickness of the protective layer 40 is T1, and the thickness of the heat exchange element 31 is T2, wherein 0.01*T2≤T1≤0.1*T2, such as T1 can be 0.05*T2 or 0.06*T2 or 0.08*T2, etc.

[0117] In the embodiment of the present application, by setting the thickness of the protective layer 40 to T1 and the thickness of the heat exchange element 31 to T2, wherein 0.01*T2≤T1≤0.1*T2, the thickness of the protective layer 40 can be determined according to the thickness of the heat exchange element 31, thereby controlling the thickness of the protective layer 40.

[0118] It should be noted that the protective layer 40 may cover the entire surface of the heat exchange element 31 facing the battery cell 10, or may cover a portion of the surface of the heat exchange element 31 facing the battery cell 10. Figure 4 In the embodiment, the protective layer 40 covers a portion of the surface of the heat exchange element 31 facing the battery cell 10 , that is, the protective layer 40 covers a portion of the upper surface of the heat exchange element 31 .

[0119] Accordingly, when the protective layer 40 is provided on the battery cell 10 , it can be provided on the entire surface of the battery cell 10 facing the heat exchange element 31 , or it can cover a portion of the surface of the battery cell 10 facing the heat exchange element 31 .

[0120] Optionally, the thickness of the protective layer 40 is T1, 1 micron≤T1≤500 microns, for example, T1 may be 5 microns, 10 microns, 50 microns, 100 microns, 200 microns, 300 microns or 400 microns.

[0121] In the embodiment of the present application, the thickness of the protective layer 40 is set to T1, where 1 micron ≤ T1 ≤ 500 microns. A common spraying method can be used. The thickness of the protective layer 40 can be controlled through a single spraying, thereby improving the spraying efficiency of the protective layer 40.

[0122] Optionally, the protective layer 40 is a heat conductor.

[0123] It should be noted that the heat conducting member mentioned here refers to a component with a heat conducting function, and the heat exchange function between the battery cell 10 and the heat exchange member 31 can be achieved through the heat conducting member.

[0124] In the embodiment of the present application, the protective layer 40 is provided as a heat conductor, thereby enabling heat exchange between the battery cell 10 and the heat exchange element 31 and reducing the impact of the protective layer 40 on the heat exchange efficiency of the battery device 100 .

[0125] Optionally, a heat exchange element 31 is provided below the battery cell 10 in the direction of gravity, and / or a heat exchange element 31 is provided on a side of the battery cell 10 .

[0126] like Figure 3As shown, the ZZ direction of the battery device 100 is the height direction of the battery device 100, that is, the direction of gravity. The XX direction of the battery device 100 is the length direction of the battery device 100, and the YY direction of the battery device 100 is the width direction of the battery device 100. The thermal management assembly 30 can be located below the battery cell 10 along the direction of gravity. In this case, the heat exchange component 31 contacts the bottom of the battery cell 10. The thermal management assembly 30 can also be located on the left or right side of the battery cell 10. In this case, the thermal management assembly 30 contacts the largest side of the battery cell 10. Of course, the heat exchange component 31 of the thermal management assembly 30 here can also be located at the bottom of the battery cell 10 and on the left or right side of the battery cell 10 to achieve a better heat exchange effect.

[0127] In the embodiments of the present application, a heat exchange element 31 is provided below the battery cell 10 along the direction of gravity, and / or a heat exchange element 31 is provided on the side of the battery cell 10. Therefore, the protective layer 40 can be provided below and / or on the side of the battery cell 10, and the protective layer 40 can be conveniently provided on the surface of the heat exchange element 31 facing the battery cell 10, thereby improving the processing efficiency of the protective layer 40.

[0128] Alternatively, as Figure 3 As shown, the thermal management component 30 further includes a current collector 32 , wherein the current collector 32 is in communication with the heat exchange element 31 , and the current collector 32 can realize the circulation flow of the fluid in the thermal management component 30 , thereby achieving better heat exchange for the battery cell 10 .

[0129] In addition, there are multiple heat exchangers 31, and the multiple heat exchangers 31 are arranged at intervals. Each heat exchanger 31 is connected to the current collector 32, so that the multiple heat exchangers 31 can respectively perform heat exchange on different battery cells 10.

[0130] 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.

[0131] The present invention provides a battery device 100, comprising a battery housing 20, battery cells 10, and a thermal management assembly 30. The battery housing 20 has a storage space 23; the battery cells 10 are disposed in the storage space. The thermal management assembly 30 includes a heat exchanger 31 disposed in the storage space 23. A protective layer 40 is disposed between the heat exchanger 31 and the battery cells 10. The heat exchanger 31 is configured to exchange heat with the battery cells 10, and the protective layer 40 is used to isolate the heat exchanger 31 from the exhaust of the battery cells 10. Furthermore, the melting point of the protective layer 40 is greater than the melting point of the heat exchanger 31. Furthermore, the protective layer 40 is disposed on at least a portion of the surface of the heat exchanger 31 facing the battery cells 10, and / or the protective layer 40 is disposed on at least a portion of the surface of the battery cells 10 facing the heat exchanger 31. Furthermore, the melting point of the protective layer 40 is greater than the maximum temperature at which the battery device 10 may experience thermal runaway. Furthermore, the protective layer 40 is a coating structure. Furthermore, the coating structure includes at least one of a chromium nitride coating, a titanium nitride coating, a silicon carbide coating, a zirconium dioxide coating, an iridium-based coating, an aluminum phosphide coating, and a ceramic coating. Furthermore, the coating structure is formed on at least a portion of the surface of the battery cell 10 by at least one of roller coating, brush coating, and spray coating; and / or the coating structure is formed on at least a portion of the surface of the heat exchanger 31 by at least one of roller coating, brush coating, and spray coating. Furthermore, the thickness of the protective layer 40 is less than the thickness of the heat exchanger 31. Furthermore, the thickness of the protective layer 40 is T1, and the thickness of the heat exchanger 31 is T2, wherein 0.01*T2≤T1≤0.1*T2. Furthermore, the thickness of the protective layer 40 is T1, and 1 micron≤T1≤500 microns. Furthermore, the protective layer 40 is a heat conductor. Furthermore, a heat exchanger is provided below the battery cell 10 in the direction of gravity, and / or a heat exchanger is provided on the side of the battery cell.

[0132] The above description is merely a preferred embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A battery device, characterized in that: include: A battery box having a storage space; A battery cell, the battery cell being arranged in the accommodation space; as well as A thermal management component includes a heat exchanger, which is arranged in the accommodating space. A protective layer is provided between the heat exchanger and the battery cell. The heat exchanger is configured to exchange heat with the battery cell, and the protective layer is used to isolate the emissions from the battery cell from the heat exchanger.

2. The battery device according to claim 1, wherein: The melting point of the protective layer is greater than the melting point of the heat exchange element.

3. The battery device according to claim 1, wherein: The protective layer is provided on at least a portion of the surface of the heat exchange element facing the battery cell, and / or the protective layer is provided on at least a portion of the surface of the battery cell facing the heat exchange element.

4. The battery device according to claim 1, wherein: The melting point of the protective layer is greater than the maximum temperature of thermal runaway of the battery device.

5. The battery device according to claim 1, wherein: The protective layer is a coating structure.

6. The battery device according to claim 5, wherein: The coating structure includes at least one of a chromium nitride coating, a titanium nitride coating, a silicon carbide coating, a zirconium dioxide coating, an iridium-based coating, an aluminum phosphide coating, and a ceramic coating.

7. The battery device according to claim 5, wherein: The coating structure is formed on at least a portion of the surface of the battery cell by at least one of roller coating, brush coating and spray coating; And / or the coating structure is formed on at least a portion of the surface of the heat exchange element by at least one of roller coating, brush coating and spray coating.

8. The battery device according to any one of claims 1 to 7, characterized in that The thickness of the protective layer is smaller than the thickness of the heat exchange element.

9. The battery device according to claim 8, wherein: The thickness of the protective layer is T1, and the thickness of the heat exchange element is T2, wherein 0.01*T2≤T1≤0.1*T2.

10. The battery device according to claim 8, wherein The thickness of the protective layer is T1, 1 micron≤T1≤500 microns.

11. The battery device according to any one of claims 1 to 7, characterized in that The protective layer is a heat conducting member.

12. The battery device according to any one of claims 1 to 7, characterized in that The heat exchange element is provided below the battery cell in the direction of gravity, and / or the heat exchange element is provided on a side surface of the battery cell.

13. An electrical device, characterized in that: The battery device comprises the battery device according to any one of claims 1 to 12, wherein the battery device is used to supply power to the electrical device.

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