Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer and a box body, the battery monomer is arranged in the box body, the box body comprises a wall part, and a heat exchange runner for introducing a heat exchange medium is formed in the wall part; the wall part comprises a corrosion-resistant structure and a main body structure which are connected with each other, and the corrosion-resistant structure defines a heat exchange runner. According to the structure, the heat exchange flow channel for introducing the heat exchange medium is formed in the wall part, so that the wall part of the box body is integrated with a heat exchange function, the battery monomers can be in a proper temperature interval through heat exchange with the wall part, and the space occupation caused by additional arrangement of a heat exchange device is reduced; the energy density of the battery device can be improved; the heat exchange flow channel in the wall part is enclosed by the corrosion-resistant structure, so that the heat exchange interface has good corrosion resistance, the heat exchange medium in the heat exchange flow channel is not easy to corrode the wall part, the box body has good durability, and the reliability of the battery device is improved.

Description

A battery device and an electrical device Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Technology

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, the requirements for their reliability are also increasing. How to achieve both high energy density and good reliability in battery devices is attracting more and more attention from those skilled in the art. Summary of the Invention

[0004] In view of the above problems, this application provides a battery device and an electrical device, which have both high energy density and good reliability.

[0005] Firstly, some embodiments of this application provide a battery device comprising a battery cell and a housing. The battery cell is disposed within the housing, which includes a wall with heat exchange channels formed therein for introducing a heat exchange medium. The wall includes an interconnected corrosion-resistant structure and a main body structure, with the corrosion-resistant structure surrounding the heat exchange channels. In this structure, the heat exchange channels formed in the wall integrate heat exchange functionality, allowing the battery cell to maintain a suitable temperature range through heat exchange with the wall. This reduces the space occupied by additional heat exchange devices and improves the energy density of the battery device. The heat exchange channels in the wall are surrounded by a corrosion-resistant structure, giving the heat exchange interface good corrosion resistance. The heat exchange medium in the heat exchange channels is less likely to corrode the wall, resulting in good durability of the housing and improving the reliability of the battery device.

[0006] According to some embodiments of the present application, the battery device includes a wall portion comprising a stacked housing plate and a flow channel plate. The surface of the flow channel plate facing the housing plate is recessed in a direction away from the housing plate to form a recess. The housing plate covers the recess to form a heat exchange flow channel. The housing plate includes a stacked first corrosion-resistant layer and a first main body layer. The first corrosion-resistant layer is disposed on the surface of the first main body layer facing the heat exchange flow channel. The flow channel plate includes a stacked second corrosion-resistant layer and a second main body layer. The second corrosion-resistant layer is disposed on the surface of the second main body layer facing the heat exchange flow channel. The second corrosion-resistant layer and the first corrosion-resistant layer are connected to form a corrosion-resistant structure, such that the second corrosion-resistant layer in the flow channel plate and the first corrosion-resistant layer in the housing plate are connected to form a corrosion-resistant structure in the wall portion that surrounds the heat exchange flow channel.

[0007] According to some embodiments of the present application, the battery device has a first corrosion-resistant layer made of stainless steel and a first main body layer made of iron, so that the first corrosion-resistant layer and the first main body layer can be firmly connected together by a hot rolling process; the second corrosion-resistant layer has a stainless steel structure and a second main body layer made of iron, so that the second corrosion-resistant layer and the second main body layer can be firmly connected together by a hot rolling process.

[0008] According to some embodiments of the present application, the battery device is hot-rolled together with the first corrosion-resistant layer and the first main body layer, which not only makes the first corrosion-resistant layer and the first main body layer firmly connected, but also helps to reduce the processing cost of the housing plate; the second corrosion-resistant layer and the second main body layer are hot-rolled together, which not only makes the second corrosion-resistant layer and the second main body layer firmly connected, but also helps to reduce the processing cost of the flow channel plate.

[0009] According to some embodiments of the present application, the thickness of the first corrosion-resistant layer is less than the thickness of the first main body layer, and the thickness of the second corrosion-resistant layer is less than the thickness of the second main body layer. This is beneficial to reducing the processing cost of the casing plate and the flow channel plate, thereby reducing the cost of the battery device.

[0010] According to some embodiments of the present application, the battery device further includes an adhesive structure, through which the battery cells are bonded to the surface of the first main body layer opposite to the heat exchange channel. The bonding of the battery cells to the surface of the first main body layer opposite to the heat exchange channel allows the battery cells to adhere well to the first main body layer, enabling heat exchange between the battery cells and the wall.

[0011] According to some embodiments of the battery device provided in this application, the bonding structure is configured as a thermally conductive structure. By configuring the bonding structure as a thermally conductive structure, the heat exchange efficiency between the battery cell and the wall is higher, which is beneficial to improving the reliability of the battery cell operation.

[0012] According to some embodiments of the present application, the battery device has a battery cell attached to the surface of the first main body layer away from the heat exchange channel. The channel plate also includes an impact-resistant layer, which is disposed on the surface of the second main body layer away from the heat exchange channel. This is beneficial to improving the wall's resistance to stone impacts and reducing the possibility of damage to the battery cell.

[0013] According to some embodiments of the battery device provided in this application, the housing plate further includes a third corrosion-resistant layer, which is disposed on the surface of the first main body layer facing away from the heat exchange channel. By disposing of the third corrosion-resistant layer on the surface of the first main body layer facing away from the heat exchange channel, the first main body layer can be separated from the interior of the housing by the third corrosion-resistant layer, making it less likely for the electrolyte of the battery cells in the housing to corrode the first main body layer even if it leaks, thus reducing the possibility of damage to the housing plate.

[0014] According to some embodiments of the battery device provided in this application, the flow channel plate further includes a fourth corrosion-resistant layer, which is disposed on the surface of the second main body layer facing away from the heat exchange flow channel. By disposing of the fourth corrosion-resistant layer on the surface of the second main body layer facing away from the heat exchange flow channel, the second main body layer can be separated from the external air by the fourth corrosion-resistant layer, making it less likely for substances in the external environment to corrode the second main body layer, thereby reducing the possibility of damage to the flow channel plate.

[0015] According to some embodiments of the present application, the fourth corrosion-resistant layer is made of stainless steel, which not only has good corrosion resistance but also good structural strength. This is beneficial to improving the impact resistance of the flow channel plate and reducing the possibility of damage to the flow channel plate due to impact.

[0016] According to some embodiments of the present application, the surface of the flow channel plate opposite to the housing plate protrudes in a direction away from the housing plate to form a protrusion. Along the thickness direction of the flow channel plate, the protrusion and the concave portion are opposite to each other, so that the thickness of the flow channel plate is not easily thinned due to the setting of the concave portion, so that the structural strength of the flow channel plate can be kept consistent, which is beneficial to improving the reliability of the flow channel plate.

[0017] Secondly, some embodiments of this application provide an electrical device that includes a battery device provided by any of the above-described technical solutions, the battery device being used to provide electrical energy.

[0018] The technical solutions provided by the embodiments of this disclosure bring at least the following beneficial effects:

[0019] Some embodiments of this application provide a battery device including a battery cell and a housing. The battery cell is disposed in the housing, which includes a wall with heat exchange channels for introducing a heat exchange medium. The wall includes an interconnected corrosion-resistant structure and a main structure, with the corrosion-resistant structure surrounding the heat exchange channels. In this structure, the heat exchange channels formed in the wall integrate heat exchange functionality, allowing the battery cell to maintain a suitable temperature range through heat exchange with the wall. This reduces the space occupied by additional heat exchange devices and improves the energy density of the battery device. The heat exchange channels in the wall are surrounded by a corrosion-resistant structure, giving the heat exchange interface good corrosion resistance. The heat exchange medium in the heat exchange channels is less likely to corrode the wall, resulting in good durability of the housing and improving the reliability of the battery device. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0021] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this application;

[0022] Figure 2 is a schematic diagram of the disassembled structure of a battery device provided in some embodiments of this application;

[0023] Figure 3 is a cross-sectional view of a partial structure of a battery device provided in some embodiments of this application;

[0024] Figure 4 is an exploded view of the wall portion of a battery device provided in some embodiments of this application;

[0025] Figure 5 is an enlarged view of point F in Figure 3;

[0026] Figure 6 is a cross-sectional view of a portion of the wall of a battery device provided in some embodiments of this application;

[0027] Figure 7 is a cross-sectional view of a portion of the flow channel plate in a battery device provided in some embodiments of this application;

[0028] Figure 8 is a cross-sectional view of a portion of the flow channel plate in a battery device provided in some other embodiments of this application.

[0029] In the picture;

[0030] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5a. First housing section; 5b. Second housing section; 5c. Accommodation space; 7. Battery cell; 8. Housing; 81. Wall; 810. Heat exchange channel; 811. Corrosion-resistant structure; 812. Main structure; 82. Housing plate; 821. First corrosion-resistant layer; 822. First main body layer; 823. Third corrosion-resistant layer; 83. Channel plate; 831. Second corrosion-resistant layer; 832. Second main body layer; 833. Impact-resistant layer; 834. Fourth corrosion-resistant layer; 835. Protrusion; 836. Recess; 9. Adhesive structure. Detailed Implementation

[0031] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0032] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0033] In the description of the embodiments of this application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0034] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise explicitly defined.

[0035] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0036] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0037] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in individual battery cells such as energy storage containers or energy storage cabinets. As the application fields of battery devices continue to expand, the requirements for the reliability of battery devices are also constantly increasing.

[0038] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0039] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0040] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0041] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0042] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0043] In some embodiments, the battery device may include one or more battery packs, which may include one or more individual battery cells. As an example, a battery pack includes a housing and one or more individual battery cells, which are housed within the housing, for example, by a fixed arrangement. As yet another example, the battery device may include multiple battery packs, which may be connected in series, parallel, or in a mixed configuration.

[0044] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0045] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0046] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0047] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0048] As the application scope of battery devices continues to expand in various fields, people are paying more and more attention to the reliability of battery devices. How to improve the reliability of battery devices has become an important research direction for those skilled in the art.

[0049] As devices that provide electrical energy in electrical appliances, batteries have the characteristics of high specific energy and high power density, which makes their reliability a major concern.

[0050] During charging and discharging, individual battery cells generate heat, causing their temperature to rise. To ensure the reliability of these cells, heat exchange devices are needed to control their temperature through heat exchange with them. Currently, the common approach is to install heat exchange devices within the battery pack's casing to exchange heat with the individual cells. In some cases, to increase the battery pack's energy density, the heat exchange devices are integrated into the casing's walls. This involves creating heat exchange channels within the casing walls for the heat exchange medium to flow through, allowing heat exchange between the battery cells and the medium. However, the corrosion resistance of commonly used casing wall materials is often insufficient to withstand the corrosion of the heat exchange medium, making the casing walls susceptible to damage and severely impacting the reliability of the battery pack.

[0051] To improve the reliability of battery devices, some embodiments of this application provide a battery device comprising a battery cell and a housing. The battery cell is disposed within the housing, which includes a wall with heat exchange channels for introducing a heat exchange medium. The wall includes an interconnected corrosion-resistant structure and a main structure, with the corrosion-resistant structure surrounding the heat exchange channels. In this structure, the heat exchange channels formed in the wall integrate heat exchange functionality, allowing the battery cell to maintain a suitable temperature range through heat exchange with the wall. This reduces the space occupied by additional heat exchange devices and improves the energy density of the battery device. The corrosion-resistant structure surrounding the heat exchange channels in the wall provides excellent corrosion resistance at the heat exchange interface, preventing the heat exchange medium in the channels from corroding the wall and ensuring the housing has good durability, thus improving the reliability of the battery device.

[0052] The battery device described in the embodiments of this application is applicable to electrical devices that use battery devices.

[0053] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0054] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0055] Figure 1 is a schematic diagram of a vehicle provided in some embodiments of this application.

[0056] As shown in Figure 1, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0057] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0058] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0059] Figure 2 is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application. As shown in Figure 2, the battery device 2 includes a housing 8 and battery cells 7, with the battery cells 7 housed within the housing 8. The battery cell 7 can be the smallest unit that makes up a battery.

[0060] The housing 8 is used to house the battery cell 7, and the housing 8 can have various structures. In some embodiments, the housing 8 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 7. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, covering the open side of the second housing portion 5b to form a housing 8 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 8 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0061] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0062] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0063] In the battery device 2, there can be one or more battery cells 7. If there are multiple battery cells 7, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 7 are connected in both series and parallel. Multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 7 is housed in the housing 8. Alternatively, multiple battery cells 7 can first be connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 8.

[0064] Some embodiments of this application provide a battery device. Referring to FIG3, the battery device 2 includes a battery cell 7 and a housing 8. The battery cell 7 is disposed in the housing 8. The housing 8 includes a wall portion 81, in which a heat exchange channel 810 for introducing a heat exchange medium is formed. The wall portion 81 includes a corrosion-resistant structure 811 and a main structure 812 connected to each other. The corrosion-resistant structure 811 surrounds the heat exchange channel 810.

[0065] Battery cell 7 can be a rechargeable battery cell, which refers to a battery cell 7 that can be recharged after discharge to activate the active materials and continue to be used. Battery cell 7 can be a lithium-ion battery cell, sodium-ion battery cell, sodium-lithium-ion battery cell, lithium metal battery cell, sodium metal battery cell, lithium-sulfur battery cell, magnesium-ion battery cell, nickel-metal hydride battery cell, nickel-cadmium battery cell, lead-acid battery cell, etc.

[0066] For example, the battery cell 7 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0067] When the battery device 2 includes multiple battery cells 7, the multiple battery cells 7 can be arranged and fixed to form a battery module.

[0068] The housing 8 can be a component that provides a receiving space 5c, which is used to accommodate components such as battery cells 7, wiring harnesses, and circuit boards located inside the battery device 2. The housing 8 can be the first housing part 5a in the aforementioned scheme, or the second housing part 5b in the aforementioned scheme.

[0069] The wall portion 81 can be at least a portion of the wall structure in the housing 8. As a wall structure in the housing 8, the wall portion 81 can protect the battery cells 7, wiring harnesses, circuit boards, and other components in the housing 8. For example, the wall portion 81 can be the bottom wall or the side wall of the housing 8, and those skilled in the art can choose the position of the wall portion 81 in the housing 8 according to the actual situation.

[0070] The heat exchange channel 810 can be a channel through which the heat exchange medium can circulate. By providing the heat exchange channel 810 in the wall portion 81, the heat exchange medium can circulate into the wall portion 81 through the heat exchange channel 810, so that the wall portion 81 can maintain a temperature difference with the devices (such as battery cells 7) in the housing 8, and the wall portion 81 can continuously and efficiently exchange heat with the devices (such as battery cells 7) in the housing 8.

[0071] For example, a portion of the wall 81 may be provided with a heat exchange channel 810, so that the heat exchange medium circulating in the heat exchange channel 810 can exchange heat with the battery cells 7 in the housing 8; or the entire wall 81 may be provided with a heat exchange channel 810, so that the heat exchange medium circulating in the heat exchange channel 810 can exchange heat with the battery cells 7 in the housing 8.

[0072] By providing a heat exchange channel 810 in the wall 81, the wall 81 integrates heat exchange function, eliminating the need to install heat exchange devices with heat exchange function in the housing 8 to exchange heat with the battery cell 7. This allows the heat exchange medium flowing through the wall 81 to directly exchange heat with the battery cell 7, shortening the heat transfer path between the heat exchange medium and the battery cell 7, which is beneficial to improving the heat exchange effect.

[0073] The corrosion-resistant structure 811 and the main structure 812 can be two structural parts within the wall 81. The corrosion resistance of the corrosion-resistant structure 811 is stronger than that of the main structure 812. The corrosion resistance of the corrosion-resistant structure 811 and the main structure 812 can be evaluated by their corrosion ratings after a salt spray test. The corrosion ratings of the corrosion-resistant structure 811 and the main structure 812 after the salt spray test can be determined according to the national standard GB / T 10125-2021. The specific testing method can be found in GB / T 10125-2021 and will not be elaborated here. After the salt spray test, if the corrosion rating of the corrosion-resistant structure 811 is lower than that of the main structure 812, then the corrosion resistance of the corrosion-resistant structure 811 is considered stronger than that of the main structure 812.

[0074] The corrosion-resistant structure 811 surrounds the heat exchange channel 810. This can mean that the inner wall of the heat exchange channel 810 is a corrosion-resistant structure 811, ensuring that the heat exchange interface of the heat exchange medium is composed of corrosion-resistant structures 811 with good corrosion resistance. By using the corrosion-resistant structure 811 to surround the heat exchange channel 810, the heat exchange medium in the heat exchange channel 810 comes into contact with the corrosion-resistant structure 811 with good corrosion resistance, while the main structure 812 with poor corrosion resistance is less likely to come into contact with the heat exchange medium. This makes the wall 81 less susceptible to damage due to corrosion by the heat exchange medium, giving the housing 8 good durability and improving the reliability of the battery device 2.

[0075] In the above structure, a heat exchange channel 810 for introducing a heat exchange medium is formed in the wall portion 81, so that the wall portion 81 of the housing 8 integrates a heat exchange function, allowing the battery cell 7 to exchange heat with the wall portion 81 and remain in a suitable temperature range, reducing the space occupied by additional heat exchange devices and improving the energy density of the battery device 2; the heat exchange channel 810 in the wall portion 81 is surrounded by a corrosion-resistant structure 811, so that the heat exchange interface has good corrosion resistance, and the heat exchange medium in the heat exchange channel 810 is not likely to corrode the wall portion 81, so that the housing 8 has good durability and improves the reliability of the battery device 2.

[0076] In some embodiments, referring to Figures 4, 5, and 6, the wall portion 81 includes a stacked housing plate 82 and a flow channel plate 83. The surface of the flow channel plate 83 facing the housing plate 82 is recessed in a direction away from the housing plate 82 to form a recess 836. The housing plate 82 covers the recess 836 to form a heat exchange flow channel 810. The housing plate 82 includes a stacked first corrosion-resistant layer 821 and a first main body layer 822. The first corrosion-resistant layer 821 is disposed on the surface of the first main body layer 822 facing the heat exchange flow channel 810. The flow channel plate 83 includes a stacked second corrosion-resistant layer 831 and a second main body layer 832. The second corrosion-resistant layer 831 is disposed on the surface of the second main body layer 832 facing the heat exchange flow channel 810. The second corrosion-resistant layer 831 and the first corrosion-resistant layer 821 are connected to form a corrosion-resistant structure 811.

[0077] The box plate 82 and the flow channel plate 83 can be two interconnected plate structures in the wall portion 81, which together form the wall portion 81. The box plate 82 and the flow channel plate 83 are stacked, which means that the box plate 82 and the flow channel plate 83 are arranged sequentially along the thickness direction of the wall portion 81 and are connected to each other.

[0078] For example, the connection between the housing plate 82 and the flow channel plate 83 can be that the housing plate 82 and the flow channel plate 83 are connected to each other by connecting bolts, rivets or other connecting parts; or the housing plate 82 and the flow channel plate 83 can be connected to each other by welding, gluing or other methods.

[0079] The recess 836 can be a recessed structure formed on the flow channel plate 83, which is used to form a heat exchange channel 810 through which the heat exchange medium flows. By forming the recess 836 by recessing the surface of the flow channel plate 83 toward the housing plate 82 in a direction away from the housing plate 82, the recess 836 is formed between the housing plate 82 and the flow channel plate 83, so that after the housing plate 82 covers the opening of the recess 836, a heat exchange channel 810 for the passage of the heat exchange medium can be formed between the housing plate 82 and the flow channel plate 83.

[0080] For example, the recess 836 can be formed by removing material from the surface of the flow channel plate 83 toward the housing plate 82, or by stamping to make the surface of the flow channel plate 83 toward the housing plate 82 recessed inward. Those skilled in the art can choose the forming method of the recess 836 according to the actual situation.

[0081] The first corrosion-resistant layer 821 and the first main body layer 822 can be interconnected structural layers within the housing panel 82. The corrosion resistance of the first corrosion-resistant layer 821 is stronger than that of the first main body layer 822. The corrosion resistance of the first corrosion-resistant layer 821 and the first main body layer 822 can be evaluated by their corrosion ratings after a salt spray test. The corrosion ratings of the first corrosion-resistant layer 821 and the first main body layer 822 after the salt spray test can be determined according to the national standard GB / T 10125-2021. The specific testing method can be found in GB / T 10125-2021 and will not be elaborated here. After the salt spray test, if the corrosion rating of the first corrosion-resistant layer 821 is lower than that of the first main body layer 822, it can be concluded that the corrosion resistance of the first corrosion-resistant layer 821 is stronger than that of the first main body layer 822.

[0082] The first corrosion-resistant layer 821 and the first main body layer 822 can be stacked together by sequentially attaching and connecting the housing plates 82 along their thickness direction. By placing the first corrosion-resistant layer 821 on the surface of the first main body layer 822 facing the heat exchange channel 810, the first corrosion-resistant layer 821 forms the heat exchange channel 810. The portion of the housing plate 82 in contact with the heat exchange medium flowing through the heat exchange channel 810 is the first corrosion-resistant layer 821 with better corrosion resistance, and it is less likely to come into contact with the first main body layer 822. This reduces the possibility of corrosion of the first main body layer 822 by the heat exchange medium, and helps to reduce the possibility of damage to the housing plate 82 caused by corrosion of the housing plate 82 by the heat exchange medium.

[0083] The second corrosion-resistant layer 831 and the second main body layer 832 can be interconnected structural layers within the flow channel plate 83. The corrosion resistance of the second corrosion-resistant layer 831 is stronger than that of the second main body layer 832. The corrosion resistance of the second corrosion-resistant layer 831 and the second main body layer 832 can be evaluated by their corrosion ratings after a salt spray test. The corrosion ratings of the second corrosion-resistant layer 831 and the second main body layer 832 after the salt spray test can be determined according to the national standard GB / T 10125-2021. The specific testing method can be found in GB / T 10125-2021 and will not be elaborated here. After the salt spray test, if the corrosion rating of the second corrosion-resistant layer 831 is lower than that of the second main body layer 832, it can be concluded that the corrosion resistance of the second corrosion-resistant layer 831 is stronger than that of the second main body layer 832.

[0084] The stacking of the second corrosion-resistant layer 831 and the second main body layer 832 can refer to the flow channel plate 83 being sequentially attached and connected along its thickness direction. By placing the second corrosion-resistant layer 831 on the surface of the second main body layer 832 facing the heat exchange flow channel 810, the inner wall of the recess 836 is formed by the second corrosion-resistant layer 831. The portion of the flow channel plate 83 in contact with the heat exchange medium flowing through the heat exchange channel 810 is the second corrosion-resistant layer 831 with better corrosion resistance, and it is less likely to come into contact with the second main body layer 832. This reduces the possibility of corrosion of the second main body layer 832 by the heat exchange medium, and helps to reduce the possibility of damage to the flow channel plate 83 caused by corrosion of the flow channel plate 83 by the heat exchange medium.

[0085] The second corrosion-resistant layer 831 and the first corrosion-resistant layer 821 are connected to form a corrosion-resistant structure 811. This can mean that the second corrosion-resistant layer 831 in the flow channel plate 83 and the first corrosion-resistant layer 821 in the box plate 82 are connected to form a corrosion-resistant structure 811 in the wall portion 81 that surrounds the heat exchange flow channel 810.

[0086] For example, the first main body layer 822 and the second main body layer 832 form the main body structure 812 of the wall portion 81, which encloses the corrosion-resistant structure 811 in the middle and can protect the heat exchange channel 810 surrounded by the corrosion-resistant structure 811.

[0087] For example, the second corrosion-resistant layer 831 and the first corrosion-resistant layer 821 can be connected by brazing, laser welding, adhesive bonding or other methods.

[0088] In some embodiments, the first corrosion-resistant layer 821 is a stainless steel structure, and the base material of the first main layer 822 is iron; the second corrosion-resistant layer 831 is a stainless steel structure, and the base material of the second main layer 832 is iron.

[0089] The first corrosion-resistant layer 821 being made of stainless steel means that the first corrosion-resistant layer 821 is made of stainless steel, giving it good corrosion resistance. For example, the first corrosion-resistant layer 821 can be made of 304 stainless steel or 316 stainless steel. The base material of the first main layer 822 can refer to the material with the largest mass proportion in the first main layer 822. If the base material of the first main layer 822 is iron, then both the first corrosion-resistant layer 821 and the first main layer 822 have iron as their base material, allowing them to be firmly bonded together through a hot rolling process.

[0090] The second corrosion-resistant layer 831 being made of stainless steel means that the second corrosion-resistant layer 831 is made of stainless steel, giving it good corrosion resistance. For example, the second corrosion-resistant layer 831 can be made of 304 stainless steel or 316 stainless steel. The base material of the second main layer 832 can refer to the material with the largest mass proportion in the second main layer 832. If the base material of the second main layer 832 is iron, then both the second corrosion-resistant layer 831 and the second main layer 832 have iron as their base material, allowing the second corrosion-resistant layer 831 and the second main layer 832 to be firmly bonded together through a hot rolling process.

[0091] In some embodiments, the first corrosion-resistant layer 821 and the first main body layer 822 are hot-rolled together, and the second corrosion-resistant layer 831 and the second main body layer 832 are hot-rolled together.

[0092] The first corrosion-resistant layer 821 and the first main body layer 822 are joined together by a hot rolling process, which not only ensures a strong connection between the two layers but also helps reduce the processing cost of the box plate 82. Similarly, the second corrosion-resistant layer 831 and the second main body layer 832 are joined together by a hot rolling process, which not only ensures a strong connection but also helps reduce the processing cost of the flow channel plate 83.

[0093] In some embodiments, the thickness of the first corrosion-resistant layer 821 is less than the thickness of the first main body layer 822, and the thickness of the second corrosion-resistant layer 831 is less than the thickness of the second main body layer 832.

[0094] By setting the thickness of the first corrosion-resistant layer 821 to be less than the thickness of the first main body layer 822, the thickness of the first corrosion-resistant layer 821 is thinner, which can reduce the possibility of material waste in the first corrosion-resistant layer 821 and help reduce the processing cost of the housing plate 82; by setting the thickness of the second corrosion-resistant layer 831 to be less than the thickness of the second main body layer 832, the thickness of the second corrosion-resistant layer 831 is thinner, which can reduce the possibility of material waste in the second corrosion-resistant layer 831 and help reduce the processing cost of the flow channel plate 83, thereby reducing the cost of the battery device 2.

[0095] In some embodiments, the battery device 2 further includes an adhesive structure 9, through which the battery cell 7 is bonded to the surface of the first main body layer 822 facing away from the heat exchange channel 810.

[0096] The adhesive structure 9 can be used to bond the battery cell 7 to the housing plate 82. The battery cell 7 is bonded to the surface of the first main body layer 822 away from the heat exchange channel 810 through the adhesive structure 9, so that the battery cell 7 can fit well with the first main body layer 822, and the battery cell 7 can exchange heat with the wall 81.

[0097] For example, the adhesive structure 9 can be a structure formed by curing an adhesive material coated on the surface of the first main body layer 822 away from the heat exchange channel 810, which can firmly connect the battery cell 7 to the first main body layer 822.

[0098] In some embodiments, the adhesive structure 9 is configured as a thermally conductive structure.

[0099] The adhesive structure 9 is configured as a thermally conductive structure, meaning that the adhesive structure 9 has thermal conductivity and can be a thermally conductive structural adhesive. By configuring the adhesive structure 9 as a thermally conductive structure, the heat exchange efficiency between the battery cell 7 and the wall 81 is higher, which is beneficial to improving the operational reliability of the battery cell 7.

[0100] For example, the adhesive structure 9 can be a structure formed by curing epoxy thermally conductive structural adhesive, silicone thermally conductive structural adhesive, or polyurethane thermally conductive structural adhesive.

[0101] In some embodiments, the battery cell 7 is attached to the surface of the first main body layer 822 away from the heat exchange channel 810, and the channel plate 83 further includes an impact-resistant layer 833, which is disposed on the surface of the second main body layer 832 away from the heat exchange channel 810.

[0102] The impact-resistant layer 833 can be a functional coating used to absorb, disperse, or buffer external impact forces, reducing cracking, scratches, and deformation of the second main body layer 832 caused by collisions, friction, or impacts. It is used to improve the impact resistance of the flow channel plate 83. By attaching the battery cell 7 to the surface of the first main body layer 822 facing away from the heat exchange flow channel 810, and providing the impact-resistant layer 833 on the surface of the second main body layer 832 facing away from the heat exchange flow channel 810, external impacts can first act on the impact-resistant layer 833, which helps to improve the wall portion 81's resistance to stone impacts and reduces the possibility of damage to the battery cell 7.

[0103] For example, the impact-resistant layer 833 may be a coating structure such as a polyurea coating, a glass fiber reinforced epoxy resin coating, or a nanoparticle modified elastomer coating sprayed onto the surface of the second main body layer 832 away from the heat exchange channel 810.

[0104] In some embodiments, the housing plate 82 further includes a third corrosion-resistant layer 823, which is disposed on the surface of the first main body layer 822 away from the heat exchange channel 810.

[0105] The corrosion resistance of the third corrosion-resistant layer 823 is stronger than that of the first main layer 822. The corrosion resistance of the third corrosion-resistant layer 823 can be evaluated by its corrosion rating after a salt spray test. The corrosion rating of the third corrosion-resistant layer 823 after the salt spray test can be determined according to the national standard GB / T 10125-2021. The specific testing method can be found in GB / T 10125-2021 and will not be elaborated here. If the corrosion rating of the third corrosion-resistant layer 823 after the salt spray test is lower than that of the first main layer 822, then the corrosion resistance of the third corrosion-resistant layer 823 is considered to be stronger than that of the first main layer 822.

[0106] By providing a third corrosion-resistant layer 823 on the surface of the first main body layer 822 away from the heat exchange channel 810, the first main body layer 822 can be separated from the interior of the housing 8 by the third corrosion-resistant layer 823. This makes it less likely for the electrolyte of the battery cell 7 in the housing 8 to corrode the first main body layer 822 even if it leaks, thus reducing the possibility of damage to the housing plate 82.

[0107] In some embodiments, the third corrosion-resistant layer 823 is a stainless steel structure.

[0108] By setting the third corrosion-resistant layer 823 to a stainless steel structure, the third corrosion-resistant layer 823 not only has good corrosion resistance but also good structural strength, which is beneficial to improving the structural strength of the box plate 82.

[0109] In some embodiments, referring to FIG7, the flow channel plate 83 further includes a fourth corrosion-resistant layer 834, which is disposed on the surface of the second body layer 832 opposite to the heat exchange flow channel 810.

[0110] The fourth corrosion-resistant layer 834 exhibits stronger corrosion resistance than the second main layer 832. The corrosion resistance of the fourth corrosion-resistant layer 834 can be evaluated by assessing its corrosion rating after a salt spray test. The corrosion rating of the fourth corrosion-resistant layer 834 after the salt spray test can be determined according to the national standard GB / T 10125-2021. The specific testing method can be found in GB / T 10125-2021 and will not be elaborated here. If, after the salt spray test, the corrosion rating of the fourth corrosion-resistant layer 834 is lower than that of the second main layer 832, then the fourth corrosion-resistant layer 834 is considered to have stronger corrosion resistance than the second main layer 832.

[0111] By providing a fourth corrosion-resistant layer 834 on the surface of the second main body layer 832 away from the heat exchange channel 810, the second main body layer 832 can be separated from the outside air by the fourth corrosion-resistant layer 834, making it less likely for substances in the external environment to corrode the second main body layer 832, thus reducing the possibility of damage to the channel plate 83.

[0112] In some embodiments, the fourth corrosion-resistant layer 834 is a stainless steel structure.

[0113] By setting the fourth corrosion-resistant layer 834 to a stainless steel structure, the fourth corrosion-resistant layer 834 not only has good corrosion resistance but also good structural strength, which is beneficial to improving the impact resistance of the flow channel plate 83 and reducing the possibility of damage to the flow channel plate 83 due to impact.

[0114] In some embodiments, referring to FIG8, the flow channel plate 83 protrudes outward from the surface of the housing plate 82 to form a protrusion 835, and the protrusion 835 is opposite to the recess 836 along the thickness direction of the flow channel plate 83.

[0115] By forming a protrusion 835 on the surface of the flow channel plate 83 away from the housing plate 82, which is opposite to the recess 836 along the thickness direction of the flow channel plate 83, the thickness of the flow channel plate 83 is not easily thinned due to the setting of the recess 836, so that the structural strength of the flow channel plate 83 can remain consistent, which is beneficial to improving the reliability of the flow channel plate 83.

[0116] For example, the recess 836 on the flow channel plate 83 can be formed by stamping the flow channel plate 83, which not only helps to improve the structural strength of the flow channel plate 83, but also helps to reduce the processing difficulty, improve the production efficiency of the flow channel plate 83, and reduce the production cost.

[0117] Some embodiments of this application also provide an electrical device, which includes a battery device 2 provided by any of the above technical solutions, the battery device 2 being used to provide electrical energy.

[0118] The battery device 2 provided in this application embodiment includes a battery cell 7 and a housing 8. The battery cell 7 is disposed in the housing 8. The housing 8 includes a wall portion 81. The wall portion 81 includes a housing plate 82 and a flow channel plate 83 stacked together. The flow channel plate 83 is recessed inward on the surface of the housing plate 82 to form a recess 836. The housing plate 82 covers the recess 836 to form a heat exchange flow channel 810. The housing plate 82 includes a first corrosion-resistant layer 821 and a first main body layer 822 stacked together. The first corrosion-resistant layer 821 is disposed on the surface of the first main body layer 822 facing the heat exchange flow channel 810. The flow channel plate 83 includes a second corrosion-resistant layer 831 and a second main body layer 832 stacked together. The second corrosion-resistant layer 831 is disposed on the surface of the second main body layer 832 facing the heat exchange flow channel 810. The second corrosion-resistant layer 831 and the first corrosion-resistant layer 821 are connected to form a corrosion-resistant structure 811 that surrounds the heat exchange flow channel 810. The first corrosion-resistant layer 821 and the second corrosion-resistant layer 831 are made of stainless steel.

[0119] In the above structure, a heat exchange channel 810 for introducing a heat exchange medium is formed in the wall portion 81, so that the wall portion 81 of the housing 8 integrates a heat exchange function, allowing the battery cell 7 to exchange heat with the wall portion 81 and remain in a suitable temperature range, reducing the space occupied by additional heat exchange devices and improving the energy density of the battery device 2; the heat exchange channel 810 in the wall portion 81 is surrounded by a corrosion-resistant structure 811, so that the heat exchange interface has good corrosion resistance, and the heat exchange medium in the heat exchange channel 810 is not likely to corrode the wall portion 81, so that the housing 8 has good durability and improves the reliability of the battery device 2.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this 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. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: Battery cell; The housing contains the battery cells. The housing includes a wall with heat exchange channels for introducing a heat exchange medium. The wall includes a corrosion-resistant structure and a main structure that are interconnected, with the corrosion-resistant structure surrounding the heat exchange channels.

2. The battery device according to claim 1, characterized in that, The wall portion includes a stacked box plate and a flow channel plate. The surface of the flow channel plate facing the box plate is recessed in a direction away from the box plate to form a recess. The box plate covers the recess to form the heat exchange flow channel. The box plate includes a stacked first corrosion-resistant layer and a first main body layer. The first corrosion-resistant layer is disposed on the surface of the first main body layer facing the heat exchange flow channel. The flow channel plate includes a stacked second corrosion-resistant layer and a second main body layer. The second corrosion-resistant layer is disposed on the surface of the second main body layer facing the heat exchange flow channel. The second corrosion-resistant layer and the first corrosion-resistant layer are connected to form the corrosion-resistant structure.

3. The battery device according to claim 2, characterized in that, The first corrosion-resistant layer is made of stainless steel, and the base material of the first main layer is iron; the second corrosion-resistant layer is made of stainless steel, and the base material of the second main layer is iron.

4. The battery device according to claim 3, characterized in that, The first corrosion-resistant layer and the first main body layer are hot-rolled together, and the second corrosion-resistant layer and the second main body layer are hot-rolled together.

5. The battery device according to claim 2, characterized in that, The thickness of the first corrosion-resistant layer is less than the thickness of the first main body layer, and the thickness of the second corrosion-resistant layer is less than the thickness of the second main body layer.

6. The battery device according to claim 2, characterized in that, The battery device further includes an adhesive structure, through which the battery cells are bonded to the surface of the first main body layer away from the heat exchange channel.

7. The battery device according to claim 6, characterized in that, The adhesive structure is configured as a thermally conductive structure.

8. The battery device according to claim 2, characterized in that, The battery cell is attached to the surface of the first main body layer away from the heat exchange channel. The channel plate also includes an impact-resistant layer, which is disposed on the surface of the second main body layer away from the heat exchange channel.

9. The battery device according to claim 2, characterized in that, The housing plate also includes a third corrosion-resistant layer, which is disposed on the surface of the first main body layer away from the heat exchange channel.

10. The battery device according to claim 2, characterized in that, The flow channel plate also includes a fourth corrosion-resistant layer, which is disposed on the surface of the second main body layer away from the heat exchange flow channel.

11. The battery device according to claim 10, characterized in that, The fourth corrosion-resistant layer is made of stainless steel.

12. The battery device according to claim 2, characterized in that, The flow channel plate protrudes from the surface of the housing plate away from the housing plate to form a convex part, and the convex part is opposite to the concave part along the thickness direction of the flow channel plate.

13. An electrical appliance, characterized in that, Includes the battery device as described in any one of claims 1-12, the battery device being used to provide electrical energy.

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