Battery device and electric equipment

Abstract

The embodiment of the invention provides a battery device and electric equipment. The use performance of the battery device can be improved. The battery device comprises a box body, a single battery and a heat exchange device, the box body is provided with a first accommodating cavity, the single battery is accommodated in the first accommodating cavity, and the heat exchange device is accommodated in the first accommodating cavity, is close to the single battery and is used for exchanging heat with the single battery; the heat exchange device comprises a pipeline body for containing a heat exchange medium and a first protective layer arranged on the outer surface of the pipeline body, the first protective layer is used for blocking the impact of emissions discharged by the single batteries on the pipeline body, the heat exchange device further comprises a second protective layer, and the second protective layer is arranged between the outer surface of the pipeline body and the first protective layer. And / or the second protective layer is arranged on the inner surface of the pipeline body, and the second protective layer is used for conducting thermal isolation on the pipeline body.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery device and an electrical appliance. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, besides improving the electrical performance of battery devices, safety is also a crucial issue, such as thermal runaway. If the safety of a battery device cannot be guaranteed, it becomes unusable, reducing its performance. Therefore, minimizing the impact of thermal runaway propagation from individual cells on the battery device and improving its performance has become a pressing technical problem in this field. Summary of the Invention

[0004] This application provides a battery device and an electrical appliance that can improve the performance of the battery device.

[0005] In a first aspect, this application provides a battery device, comprising: a housing having a first receiving cavity; a battery cell receiving the first receiving cavity; and a heat exchange device receiving the first receiving cavity and disposed close to the battery cell, the heat exchange device being used to exchange heat with the battery cell; the heat exchange device including a pipeline body containing a heat exchange medium and a first protective layer disposed on the outer surface of the pipeline body, the first protective layer being used to block the impact of emissions discharged from the battery cell on the pipeline body; the heat exchange device further including a second protective layer disposed between the outer surface of the pipeline body and the first protective layer, and / or, the second protective layer being disposed on the inner surface of the pipeline body, the second protective layer being used to provide thermal insulation to the pipeline body.

[0006] In this embodiment, the heat exchange device within the battery device includes a pipeline body containing a heat exchange medium and a first protective layer disposed on the outer surface of the pipeline body. The first protective layer is used to block the impact of emissions from the battery cell on the pipeline body. The heat exchange device also includes a second protective layer disposed between the outer surface of the pipeline body and the first protective layer, and / or disposed on the inner surface of the pipeline body. The second protective layer is used for thermal isolation of the pipeline body. In the event of thermal runaway of the battery cell, the high-temperature or high-pressure gas emitted by the battery cell can be effectively blocked by the first protective layer. At the same time, the second protective layer can thermally isolate the pipeline body, thereby reducing the risk of leakage caused by ablation or melting of the pipeline body due to the high-temperature environment inside the battery device, improving the performance of the heat exchange device, and thus improving the performance of the battery device.

[0007] In some embodiments, at least a portion of the pipeline body includes a corrugated pipe, and the second protective layer covers the corrugated pipe. Thus, in this embodiment, by configuring at least a portion of the pipeline body to include a corrugated pipe, the assembly of the pipeline body is facilitated. Furthermore, since the corrugated pipe is prone to damage or melting at high temperatures, by covering the corrugated pipe with the second protective layer, in the event of thermal runaway of a single battery cell, the second protective layer can provide thermal isolation to the corrugated pipe. This reduces the risk of leakage caused by the high-temperature environment inside the battery device, leading to ablation or melting of the corrugated pipe surface. This improves the performance of the heat exchange device and consequently, the performance of the battery device.

[0008] In some embodiments, the second protective layer is disposed between the outer surface of the pipeline body and the first protective layer, wherein, on a plane perpendicular to the extension direction of the pipeline body, the inner diameter r1 of the first protective layer and the outer diameter R2 of the second protective layer satisfy: r1-R2≥1mm, and the inner diameter r2 of the second protective layer and the outer diameter R3 of the pipeline body satisfy: r2-R3≥1mm.

[0009] In this embodiment, the second protective layer is disposed between the outer surface of the pipe body and the first protective layer. On a plane perpendicular to the extension direction of the pipe body, the inner diameter r1 of the first protective layer and the outer diameter R2 of the second protective layer are set to satisfy: r1-R2≥1mm, and the inner diameter r2 of the second protective layer and the outer diameter R3 of the pipe body are set to satisfy: r2-R3≥1mm, so as to facilitate the assembly between the first protective layer, the second protective layer and the pipe body, and improve the performance of the heat exchange device.

[0010] In some embodiments, the second protective layer is disposed between the outer surface of the corrugated pipe and the first protective layer, wherein, along the extension direction of the pipe body, the length L1 of the first protective layer and the length L2 of the second protective layer satisfy: L1≥L2, and the length L2 of the second protective layer and the length L3 of the corrugated pipe satisfy: L2-L3≥5mm.

[0011] In this embodiment, the second protective layer is disposed between the outer surface of the corrugated pipe and the first protective layer. Along the extension direction of the pipe body, the length L1 of the first protective layer and the length L2 of the second protective layer are set to satisfy: L1≥L2, and the length L2 of the second protective layer and the length L3 of the corrugated pipe are set to satisfy: L2-L3≥5mm. This balances the protective performance of the corrugated pipe with the assembly tolerances between the first protective layer, the second protective layer and the corrugated pipe, thereby improving the performance of the heat exchange device.

[0012] In some embodiments, the first protective layer and the second protective layer are an integral structure. Thus, in this embodiment, by setting the first protective layer and the second protective layer as an integral structure, the performance of the protective layer in blocking the impact of emissions from the battery cell on the pipeline body and the performance in thermally isolating the pipeline body can be taken into account. This reduces the space occupied by the protective layer in the first receiving cavity, increases the energy density of the battery cell, thereby improving the performance of the battery device and saving assembly process.

[0013] In some embodiments, the maximum thickness D1 of the integrated structure satisfies: 0mm < D1 ≤ 1mm. Thus, in this embodiment, by setting the first protective layer and the second protective layer as an integrated structure, and setting the thickness D1 of the integrated structure to satisfy: 0mm < D1 ≤ 1mm, the performance of the integrated structure in blocking the impact of emissions from the battery cell on the pipeline body and in providing thermal insulation to the pipeline body can be considered. Furthermore, by adjusting the maximum thickness of the integrated structure, the internal space occupied by the pipeline body in the first receiving cavity can be reduced, thereby increasing the energy density of the battery cell, improving the performance of the battery device, and simultaneously saving assembly time.

[0014] In some embodiments, the first protective layer is disposed on the outer surface of the pipe body, and the second protective layer is disposed on the inner surface of the pipe body, wherein, on a plane perpendicular to the extension direction of the pipe body, the inner diameter r4 of the first protective layer and the outer diameter R6 of the pipe body satisfy: r4-R6≥1mm, and the outer diameter R5 of the second protective layer and the inner diameter r6 of the pipe body satisfy: 0mm≤r6-R5≤1mm.

[0015] In this embodiment, the first protective layer is disposed on the outer surface of the pipe body, and the second protective layer is disposed on the inner surface of the corrugated pipe. On a plane perpendicular to the extension direction of the pipe body, the inner diameter r4 of the first protective layer and the outer diameter R6 of the pipe body are set to satisfy: r4-R6≥1mm, and the outer diameter R5 of the second protective layer and the inner diameter r6 of the pipe body are set to satisfy: 0mm≤r6-R5≤1mm, so as to facilitate the assembly between the first protective layer, the second protective layer and the pipe body, and improve the performance of the heat exchange device.

[0016] In some embodiments, the first protective layer is disposed on the outer surface of the corrugated pipe, and the second protective layer is disposed on the inner surface of the corrugated pipe, wherein, along the extension direction of the pipe body, the length L4 of the first protective layer and the length L6 of the corrugated pipe satisfy: L4-L6≥5mm, and the length L5 of the second protective layer and the length L6 of the corrugated pipe satisfy: L5-L6≥5mm.

[0017] In this embodiment, the first protective layer is disposed on the outer surface of the corrugated pipe, and the second protective layer is disposed on the inner surface of the corrugated pipe. Along the extension direction of the pipe body, by satisfying the following conditions: the length L4 of the first protective layer and the length L6 of the corrugated pipe are L4-L6≥5mm, and the length L5 of the second protective layer and the length L6 of the corrugated pipe are L5-L6≥5mm, the protective performance of the corrugated pipe and the assembly tolerance between the first protective layer, the second protective layer and the corrugated pipe are taken into account, thereby improving the performance of the heat exchange device.

[0018] In some embodiments, the second protective layer is thermally fused or bonded to the inner surface of the pipeline body. Thus, in this embodiment, by thermally fused or bonded the second protective layer to the inner surface of the pipeline body, both the performance of the pipeline body and the bonding strength between the second protective layer and the second surface are considered. Furthermore, this connection method is simple and easy to process and manufacture.

[0019] In some embodiments, the heat resistance temperature of the material of the first protective layer is greater than or equal to 500°C, and / or the heat resistance temperature of the material of the second protective layer is greater than or equal to 500°C. Thus, in this embodiment, by setting the heat resistance temperature of the material of the first protective layer to greater than or equal to 500°C, and / or setting the heat resistance temperature of the material of the second protective layer to greater than or equal to 500°C, the thermal insulation performance of the second protective layer and the thermal impact of the first protective layer on the second protective layer are balanced. This reduces the risk of the first protective layer causing ablation or melt-through of the second protective layer during heating, effectively protecting the pipeline body and improving the performance of the heat exchange device.

[0020] In some embodiments, the material of the second protective layer includes at least one of the following materials: glass fiber, mica sheet, aerogel, and pre-oxidized fiber. Thus, in this embodiment, by setting the material of the second protective layer to include at least one of the following materials: glass fiber, mica sheet, aerogel, and pre-oxidized fiber, the thermal insulation performance of the second protective layer is effectively improved, thereby providing thermal insulation to the pipeline body and improving the performance of the heat exchange device.

[0021] In some embodiments, the material of the first protective layer includes a phase change material or a ceramicized composite tape. Thus, in this embodiment, by setting the material of the first protective layer to include a phase change material or a ceramicized composite tape, the performance of the first protective layer in resisting or blocking the high-temperature or high-pressure gas discharged from the battery cell is effectively improved in the event of thermal runaway of the battery cell, thereby effectively protecting the pipeline body and improving the performance of the heat exchange device.

[0022] In some embodiments, the heat exchange device further includes a heat exchange plate and two pipe bodies. The surface of the housing is provided with an inlet and an outlet that communicate with the outside. One end of the first pipe body of the two pipe bodies is connected to the inlet, and the other end of the first pipe body is connected to the heat exchange plate. One end of the second pipe body of the two pipe bodies is connected to the outlet, and the other end of the second pipe body is connected to the heat exchange plate.

[0023] In this embodiment, the heat exchange device is configured to include a heat exchange plate and two pipe bodies, and the surface of the housing is provided with an inlet and an outlet that communicate with the outside. One end of the first pipe body is connected to the inlet, and the other end of the first pipe body is connected to the heat exchange plate. One end of the second pipe body is connected to the outlet, and the other end of the second pipe body is connected to the heat exchange plate. That is, the heat exchange medium provided by the external device can circulate between the heat exchange device and the outside of the housing through the inlet and outlet, so as to facilitate heat exchange with the battery cells, reduce the risk of thermal runaway of the battery cells, and improve the performance of the battery device.

[0024] In a second aspect, an electrical device is provided, including the battery device described in the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0025] In some implementations, the electrical equipment can be a vehicle, a ship, or a spacecraft. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application.

[0028] Figure 2 This is a schematic diagram of the structure of a battery device provided in an embodiment of this application.

[0029] Figure 3 This is a schematic diagram of the structure of a battery cell provided in an embodiment of this application.

[0030] Figure 4 This is a schematic diagram of the exploded structure of a battery cell provided in another embodiment of this application.

[0031] Figure 5 This is a schematic diagram of the structure of a battery device provided in another embodiment of this application.

[0032] Figure 6 This is a cross-sectional schematic diagram of a heat exchange device provided in an embodiment of this application.

[0033] Figure 7 This is a cross-sectional schematic diagram of a heat exchange device provided in another embodiment of this application.

[0034] Figure 8 This is a cross-sectional schematic diagram of a heat exchange device provided in another embodiment of this application.

[0035] Figure 9 This is a cross-sectional schematic diagram of a heat exchange device provided in another embodiment of this application.

[0036] Figure 10 This is a cross-sectional schematic diagram of a heat exchange device provided in another embodiment of this application.

[0037] Figure 11 This is a cross-sectional schematic diagram of a heat exchange device provided in another embodiment of this application.

[0038] Explanation of reference numerals in the attached drawings: 1-Vehicle; 10-Battery unit; 20-Battery cell; 30-Controller; 40-Motor; 11-Casing; 111-First part; 112-Second part; 112a-Base plate; 112b-Side plate; 21-Outer shell; 22-Electrode assembly; 211-Housing shell; 212-End cap; 213-Pressure relief mechanism; 222-Taper; 222a-Positive electrode tab; 222b-Negative electrode tab; 214-Electrode terminal; 214a - Positive electrode terminal; 214b - Negative electrode terminal; 23 - Connecting member; 24 - Insulating member; 50 - First receiving cavity; 60 - Heat exchange device; 610 - Pipe body; 611 - First pipe body; 612 - Second pipe body; 620 - Outer surface; 630 - Inner surface; 640 - Corrugated pipe; 710 - First protective layer; 720 - Second protective layer; 70 - Integrated structure; 730 - Liquid inlet; 740 - Liquid outlet; 750 - Heat exchange plate.

[0039] The accompanying drawings are not drawn to scale. Detailed Implementation

[0040] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0043] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0047] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0048] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0049] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0050] As an example, the pressure relief mechanism can be integrally molded with the housing.

[0051] As an example, the pressure relief mechanism can also be separately installed and connected to the housing.

[0052] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be configured as a through hole for venting gas inside the battery cell.

[0053] The emissions emitted by the battery cells mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0054] The battery device 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, which are connected in series, parallel, or mixed connections via a busbar.

[0055] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0056] 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.

[0057] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0058] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0059] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0064] Currently, the development of battery device technology must consider multiple design factors simultaneously, such as energy density, cycle life, discharge capacity, and charge / discharge rate. In the development of battery device technology, besides improving the electrical performance of the battery device, safety is also a crucial issue. For example, there is the problem of thermal runaway in battery devices. If the safety of the battery device cannot be guaranteed, it cannot be used, reducing its performance. Therefore, how to reduce the risk of thermal runaway propagation from individual battery cells and improve the performance of the battery device has become an urgent technical problem to be solved in this field. Specifically, a pipe body is usually installed on the inner wall of the battery device casing near the individual battery cells, and a gas shield layer, such as a fiberglass sleeve, is installed around the outer periphery of the pipe body to prevent the thermal shock of the high-temperature, high-pressure gas discharged from the individual battery cells to the pipe body in the event of thermal runaway. However, in actual use, although the gas shield layer plays a role in resisting thermal shock, its own temperature will continuously increase with the increase of the external airflow temperature, increasing the risk of surface ablation or melting through the pipe body, leading to leakage and reducing the performance of the battery device.

[0065] Therefore, embodiments of this application provide a battery device and an electrical appliance. The battery device includes: a housing, a battery cell, and a heat exchange device. The housing has a first receiving cavity in which the battery cell is received. The heat exchange device is received in the first receiving cavity and disposed close to the battery cell. The heat exchange device is used to exchange heat with the battery cell. The heat exchange device includes a pipeline body containing a heat exchange medium and a first protective layer disposed on the outer surface of the pipeline body. The first protective layer is used to block the impact of emissions from the battery cell on the pipeline body. The heat exchange device also includes a second protective layer disposed between the outer surface of the pipeline body and the first protective layer, and / or, the second protective layer is disposed on the inner surface of the pipeline body. The second protective layer is used to provide thermal insulation to the pipeline body. Thus, in this embodiment of the application, by providing a pipeline body containing a heat exchange medium and a first protective layer disposed on the outer surface of the pipeline body in the heat exchange device within the battery device, the first protective layer is used to block the impact of emissions from the battery cell on the pipeline body. The heat exchange device is also provided with a second protective layer, which is disposed between the outer surface of the pipeline body and the first protective layer, and / or, the second protective layer is disposed on the inner surface of the pipeline body. The second protective layer is used to thermally insulate the pipeline body. In the event of thermal runaway of the battery cell, the high-temperature or high-pressure gas discharged from the battery cell can be effectively blocked by the first protective layer, while the second protective layer can thermally insulate the pipeline body, thereby reducing the risk of leakage caused by the surface of the pipeline body being ablated or melted through due to the high-temperature environment inside the battery device, improving the performance of the heat exchange device, and thus improving the performance of the battery device.

[0066] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery devices.

[0067] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. 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. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0068] It should be understood that the technical solutions described in the embodiments of this application are not limited to the electrical equipment described above, but can also be applied to all devices that use batteries. For the sake of simplicity, the following embodiments will be described in detail using a vehicle as an example of electrical equipment.

[0069] For example, such as Figure 1 The diagram shown is a structural schematic of a vehicle 1 according to one embodiment of this application. Vehicle 1 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A motor 40, a controller 30, and a battery device 10 can be installed inside vehicle 1. The controller 30 controls the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be installed at the bottom, front, or rear of vehicle 1. The battery device 10 can be used to power vehicle 1. For example, the battery device 10 can serve as the operating power source for vehicle 1, for example, to meet the electrical system requirements of vehicle 1, such as for starting, navigation, and operation. In another embodiment of this application, the battery device 10 can not only serve as the operating power source for vehicle 1, but also as the driving power source for vehicle 1, replacing or partially replacing gasoline or natural gas to provide driving power for vehicle 1.

[0070] To meet different power demands, the battery device 10 in this embodiment may include at least one battery cell assembly, which comprises multiple battery cells. These multiple battery cells can be electrically connected in series, parallel, or a combination thereof to form the battery device 10. A combination of series and parallel connections is used. The battery device 10 may also be referred to as a battery pack. For example, multiple battery cells can first be connected in series, parallel, or a combination to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form the battery device 10. That is, multiple battery cells can directly form the battery device 10, or they can first be assembled into battery modules, and then the battery modules can be assembled into the battery device 10.

[0071] For example, such as Figure 2 The diagram shown is a structural schematic of a battery device 10 according to an embodiment of this application. The battery device 10 may include a plurality of battery cells 20. The battery device 10 may also include a housing 11 (or cover), the housing 11 having a hollow structure, and the plurality of battery cells 20 are housed within the housing 11. For example, the plurality of battery cells 20 may be connected in parallel, in series, or in a mixed configuration and then placed within the housing 11.

[0072] like Figure 2As shown, the housing 11 may include two parts, referred to here as the first part 111 and the second part 112, which are fastened together. The shapes of the first part 111 and the second part 112 can be determined according to the combined shape of multiple battery cells 20. Both the first part 111 and the second part 112 may have an opening. For example, both the first part 111 and the second part 112 may be hollow cuboids with only one open face. The openings of the first part 111 and the second part 112 are opposite to each other, and the first part 111 and the second part 112 are fastened together to form a housing 11 with a closed cavity. The second part 112 may include a bottom plate 112a, a side plate 112b, and a beam. Multiple battery cells 20 are connected in parallel, series, or mixed configurations and placed inside the housing 11 formed by the fastening of the first part 111 and the second part 112.

[0073] Optionally, the battery device 10 may also include other structures, which will not be described in detail here. For example, the battery device 10 may also include a busbar component for realizing the electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can realize the electrical connection between battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the housing by a conductive mechanism. Optionally, the conductive mechanism may also be part of the busbar component.

[0074] Figure 3 This paper shows a schematic diagram of the structure of a battery cell 20 provided in an embodiment of this application. Figure 4 An exploded structural diagram of a battery cell 20 according to another embodiment of this application is shown. Figure 3 and Figure 4 As shown, the battery cell 20 in this embodiment may include a housing 21 and an electrode assembly 22. The housing 21 has a closed receiving space, and the electrode assembly 22 is placed in the receiving space within the housing 21. The housing 21 may include a shell 211 and an end cap 212. The shell 211 is a hollow structure with at least one opening; the end cap 212 is used to fasten with the shell 211 to form a housing 21 with a closed receiving space.

[0075] It should be understood that the battery cell 20 in this application embodiment can be a secondary battery. A secondary battery refers to a battery cell 20 that can be recharged after being discharged to activate the active materials and continue to be used. For example, the battery cell 20 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0076] The electrode assembly 22 in this embodiment includes a positive electrode, a negative electrode, and a separator, with the separator disposed between the negative and positive electrodes. During the charging and discharging process of the battery cell 20, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0077] In some embodiments, the end cap 212 may be a plate-like structure used to cover the opening of the housing 211. In other embodiments, the end cap 212 has a similar structure to the housing 211, that is, both the housing 211 and the end cap 212 are hollow structures with one opening, and the two openings are joined together to form an outer shell 21 with a closed accommodating space.

[0078] It should be understood that if the end cap 212 is a plate-like structure, the shell 211 can be a hollow structure with an opening at one or more ends. For example, if the shell 211 is a hollow structure with an opening at one end, the end cap 212 can be set as one; if the shell 211 is a hollow structure with openings at opposite ends, the end cap 212 can be set as two, with the two end caps 212 respectively covering the openings at both ends of the shell 211.

[0079] The outer shell 21 can be of various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, ... Figure 3 and Figure 4 As shown in the embodiments of this application, the description mainly takes the outer shell 21 as a cuboid structure.

[0080] It should be understood that the end cap 212 in this embodiment is used to cooperate with the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 212 can be adapted to the shape of the housing 211, such as... Figure 3 and Figure 4 As shown, the shell 211 has a cuboid structure, and the end cap 212 has a rectangular plate structure that is adapted to the shell 211.

[0081] In some embodiments, the housing 211 may be a hollow structure with an opening at at least one end, and the shape of the end cap 212 may be adapted to the shape of the housing 211. The end cap 212 is used to cover the opening of the housing 211 so that the housing 21 isolates the internal environment of the battery cell 20 from the external environment. If the housing 211 is a hollow structure with an opening at one end, the end cap 212 may be provided as one.

[0082] The material of the housing 211 in this embodiment may include one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may also be one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 212 may be the same as or different from that of the housing 211; the materials of the different walls of the housing 211 may also be the same or different.

[0083] The end cap 212 in this embodiment can be any wall of the outer shell 21. For example, the end cap 212 can be the wall with the largest area among the multiple walls included in the outer shell 21, or the wall with the smallest area, or it can be other walls. This embodiment is not limited to this. Alternatively, the end cap 212 can also be other structures. For example, the end cap 212 can also be a groove structure with an opening to cover the opening of the shell 211. This embodiment is not limited to this.

[0084] It should be understood that the battery cell 20 also includes electrode terminals 214. In this embodiment, the electrode terminals 214 are used for electrical connection with the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. Figures 3 to 4 As shown, the battery cell 20 may include at least two electrode terminals 214, which may include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b. The positive electrode terminal 214a is used for electrical connection to the positive electrode tab 222a of the electrode assembly 22, and the negative electrode terminal 214b is used for electrical connection to the negative electrode tab 222b of the electrode assembly 22. The positive electrode terminal 214a and the positive electrode tab 222a may be directly connected or indirectly connected, and the negative electrode terminal 214b and the negative electrode tab 222b may be directly connected or indirectly connected. For example, the positive electrode terminal 214a may be electrically connected to the positive electrode tab 222a through a connecting member 23, and the negative electrode terminal 214b may be electrically connected to the negative electrode tab 222b through a connecting member 23. It should be understood that in the embodiments of this application, the positive electrode tab 222a and the negative electrode tab 222b may be collectively referred to as tab 222.

[0085] In this embodiment, the wall of the housing 211 and the wall of the end cap 212 are both referred to as the wall of the battery cell 20. Figure 3 and Figure 4The rectangular battery cell 20 shown has a housing 211 with a bottom wall and four side walls. The housing 211 is shaped according to the combination of one or more electrode assemblies 22. For example, the housing 211 can be a hollow cuboid, cube, or cylinder, and one face of the housing 211 has an opening to allow one or more electrode assemblies 22 to be placed inside. For example, when the housing 211 is a hollow cuboid or cube, one plane of the housing 211 is an open face, meaning that this plane has no wall, allowing communication between the inside and outside of the housing 211. When the housing 211 is a hollow cylinder, the end face of the housing 211 is an open face, meaning that this end face has no wall, allowing communication between the inside and outside of the housing 211. An end cap 212 covers the opening and connects to the housing 211 to form a closed cavity for placing the electrode assemblies 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0086] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are provided inside the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure.

[0087] In this battery cell 20, the electrode assembly 22 is the component in which the electrochemical reaction occurs. Depending on actual usage requirements, the electrode assembly 22 within the casing 211 can be one or multiple. For example, as... Figure 4 As shown, two electrode assemblies 22 are disposed within the battery cell 20. The electrode assembly 22 can be a cylinder, a cuboid, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the housing 211 can also be a cuboid structure. In this embodiment, the material of the housing 211 may include the following materials: copper, iron, aluminum, steel, aluminum alloy, etc.

[0088] The pressure relief mechanism 213 provided on the battery cell 20 can be any of the possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism, which is configured to melt when the internal temperature of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold; and / or, the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism, which is configured to rupture when the internal gas pressure of the battery cell 20 with the pressure relief mechanism 213 reaches a threshold.

[0089] In some implementations, an insulating member 24 may also be provided in the battery cell 20. The insulating member 24 is disposed in the accommodating space of the housing 211, and the insulating member 24 may be a hollow structure with one or more openings. The accommodating space in the hollow structure is used to accommodate the electrode assembly 22 to improve the insulation performance of the battery cell 20.

[0090] Figure 5 A schematic diagram of the structure of a battery device 10 provided in another embodiment of this application is shown. Figure 6 A cross-sectional schematic diagram of a heat exchange device 60 provided in an embodiment of this application is shown. Figure 7 A cross-sectional schematic diagram of a heat exchange device 60 provided in another embodiment of this application is shown. Figure 8 A cross-sectional schematic diagram of a heat exchange device 60 provided in another embodiment of this application is shown. Figure 9 A cross-sectional schematic diagram of a heat exchange device 60 provided in another embodiment of this application is shown. Figure 10 A cross-sectional schematic diagram of a heat exchange device 60 provided in another embodiment of this application is shown. Figure 11 A cross-sectional schematic diagram of a heat exchange device 60 provided in another embodiment of this application is shown.

[0091] Figure 6 , Figure 8 and Figure 10 The cross-sectional schematic diagram of the pipe body 610 in the heat exchange device 60 shown can be a cross-sectional view of different pipe bodies 610 to show the internal structure of the pipe body 610. Figure 7 , Figure 9 and Figure 11 The cross-sectional schematic diagrams of the pipe body 610 in the heat exchanger 60 shown can be cross-sectional schematic diagrams of different pipe bodies 610 in the extension direction perpendicular to the pipe body 610. It should also be understood that... Figure 6 and Figure 7 The pipe body 610 in the heat exchange device 60 shown can be a cross-sectional schematic diagram of the same pipe body 610 in different directions. Figure 8 and Figure 9 The pipe body 610 in the heat exchange device 60 shown can be a cross-sectional schematic diagram of the same pipe body 610 in different directions. Figure 10 and Figure 11 The pipe body 610 in the heat exchange device 60 shown can be a cross-sectional schematic diagram of the same pipe body 610 in different directions.

[0092] In some implementations, such as Figures 5 to 11As shown, the battery device 10 includes: a housing 11, a battery cell 20, and a heat exchange device 60. The housing 11 has a first receiving cavity 50; the battery cell 20 is received in the first receiving cavity 50, and the heat exchange device 60 is received in the first receiving cavity 50 and disposed close to the battery cell 20. The heat exchange device 60 is used to exchange heat with the battery cell 20. The heat exchange device 60 includes a pipeline body 610 for receiving a heat exchange medium and a first... A first protective layer 710 is provided to block the impact of the emissions from the battery cell 20 on the pipeline body 610. The heat exchange device 60 also includes a second protective layer 720, which is disposed between the outer surface 620 of the pipeline body 610 and the first protective layer 710, and / or, the second protective layer 720 is disposed on the inner surface 630 of the pipeline body 610, and is used to provide thermal insulation for the pipeline body 610.

[0093] It should be understood that the first receiving cavity 50 of the box 11 can be an open receiving cavity or a closed receiving cavity. For example, if the first receiving cavity 50 is an open receiving cavity, at least one opening can be provided at the end of the first receiving cavity 50 for sealing connection with the box lid.

[0094] It should also be understood that the pressure relief mechanism 213 in the battery cell 20 of this application embodiment refers to an element or component that is actuated when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold to release the internal pressure or temperature. The design of this threshold varies depending on the design requirements. This threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 20.

[0095] The term "actuation" as used in this application refers to the pressure relief mechanism 213 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 20. The actions of the pressure relief mechanism 213 may include, but are not limited to, at least a portion of the pressure relief mechanism 213 rupturing, breaking, tearing, or opening. During the actuation process of the pressure relief mechanism 213, the high-temperature and high-pressure substances inside the battery cell 20 are discharged outwards from the actuated portion as waste. This method enables the battery cell 20 to release pressure and temperature under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0096] The emissions emitted by the battery cell 20 mentioned in this application embodiment include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the insulating component 24, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0097] It should also be understood that the first protective layer 710 is disposed on the outer surface 620 of the pipeline body 610, which means that the first protective layer 710 can cover at least a portion of the outer surface of the pipeline body 610, and the first protective layer 710 and the outer surface 620 may not be fixedly connected, that is, there may be a gap between the first protective layer 710 and the outer surface 620.

[0098] In some implementations, the second protective layer 720 may be disposed between the outer surface 620 and the first protective layer 710. This means that the second protective layer 720 may cover at least a portion of the outer surface 620 of the pipe body 610, and the first protective layer 710 may cover the outer periphery of the second protective layer 720 on the side away from the pipe body 610. It should be understood that the second protective layer 720 and the first protective layer 710 may not be fixedly connected, and the second protective layer 720 and the outer surface 620 may not be fixedly connected; that is, gaps may exist between the second protective layer 720 and the first protective layer 710, and between the second protective layer 720 and the outer surface 620.

[0099] It should also be understood that the shapes of the first protective layer 710 and the second protective layer 720 in the embodiments of this application can be set according to actual needs. For example, both the first protective layer 710 and the second protective layer 720 can be hollow tubular structures.

[0100] It should also be understood that the heat exchange medium contained in the pipe body 610 may include at least one of the following: water-based coolant, glycol-based coolant, mineral oil, synthetic oil, etc.

[0101] In some implementations, the second protective layer 720 may also be disposed on the inner surface 630 of the pipe body 610, meaning that the second protective layer 720 can be connected to at least a portion of the inner surface 630 of the pipe body 610. It should be understood that when the second protective layer 720 is disposed on the inner surface 630, if the second protective layer 720 detaches or is not fixedly connected to the inner surface 630, the thermal insulation performance of the pipe body 610 may decrease, posing a risk of ablation or melt-through of the pipe body 610. Therefore, it is necessary to fix the second protective layer 720 to at least a portion of the inner surface 630 of the pipe body 610, for example, by thermal fusion or adhesive bonding.

[0102] It should also be understood that in some implementations, the heat exchange device 60 in this application embodiment may include two second protective layers 720, one of which is disposed between the outer surface 620 and the first protective layer 710, and the other is disposed on the inner surface 630 of the pipe body 610.

[0103] In this embodiment, the heat exchange device 60 within the battery device 10 includes a pipe body 610 containing a heat exchange medium and a first protective layer 710 disposed on the outer surface 620 of the pipe body 610. The first protective layer 710 is used to block the impact of emissions from the battery cell 20 on the pipe body 610. The heat exchange device 60 also includes a second protective layer 720, which is disposed between the outer surface 620 of the pipe body 610 and the first protective layer 710, and / or, the second protective layer 720 is disposed on the outer surface 620 of the pipe body 610. The inner surface 630, the second protective layer 720 is used to thermally insulate the pipeline body 610. In the event of thermal runaway of the battery cell 20, the high temperature or high pressure gas discharged through the battery cell 20 can be effectively blocked by the first protective layer 710. At the same time, the second protective layer 720 can thermally insulate the pipeline body 610 to reduce the risk of leakage caused by the high temperature environment inside the battery device 10, which may result in the surface of the pipeline body 610 being burned or melted through. This improves the performance of the heat exchange device 60 and thus improves the performance of the battery device 10.

[0104] In some implementations, such as Figures 6 to 11 As shown, at least a portion of the pipeline body 610 includes a corrugated pipe 640, and the second protective layer 720 covers the corrugated pipe 640.

[0105] It should be understood that at least a portion of the pipeline body 610 in this embodiment includes a corrugated pipe 640. This means that at least a portion of the pipeline body 610 can be configured as a corrugated pipe 640. The corrugated pipe 640 can absorb the thermal expansion and contraction of the pipeline caused by temperature changes, reduce the stress on the pipeline, and thus reduce the risk of pipeline body 610 rupture. Secondly, the corrugated pipe 640 has good elasticity to absorb and buffer vibrations caused by the flow of heat exchange medium or external impacts, reducing the impact of the pipeline body 610 on other equipment inside the battery device 10. The corrugated pipe 640 has good flexibility to adapt to various complex installation environments, making the arrangement of the pipeline body 610 more flexible and convenient for installation and maintenance.

[0106] It should also be understood that the second protective layer 720 covering the corrugated pipe 640 can mean that when the second protective layer 720 is provided on the outer surface of the corrugated pipe 640, the second protective layer 720 can completely wrap the outer surface of the corrugated pipe 640 to protect the corrugated pipe 640; when the protective layer 720 is provided on the inner surface of the corrugated pipe 640, the second protective layer 720 is fixedly connected to the entire inner surface of the corrugated pipe 640 to protect the corrugated pipe 640.

[0107] It should also be understood that the area where the corrugated pipe 640 is installed in the pipe body 610 can be set according to actual needs, for example, such as Figure 5 As shown, the corrugated pipe 640 can be disposed in the region near the inlet 730 of the pipe body 610, and / or in the region near the outlet 740, to facilitate the assembly of the pipe body 610.

[0108] In this embodiment, at least a portion of the pipeline body 610 is configured to include a corrugated pipe 640 to facilitate the assembly of the pipeline body 610. Since the corrugated pipe 640 is prone to damage or melting at high temperatures, the second protective layer 720 is configured to cover the corrugated pipe 640. In the event of thermal runaway of the battery cell 20, the second protective layer 720 can provide thermal isolation to the corrugated pipe 640, reducing the risk of leakage caused by ablation or melting of the corrugated pipe 640 due to the high-temperature environment inside the battery device 10. This improves the performance of the heat exchange device 60, thereby enhancing the overall performance of the battery device 10.

[0109] It should be understood that, such as Figure 6 and Figure 7 As shown, when the second protective layer 720 is disposed between the outer surface 620 and the first protective layer 710, the inner diameter of the first protective layer 710 in this embodiment can be represented by r1, the outer diameter of the first protective layer 710 can be represented by R1, the inner diameter of the second protective layer 720 can be represented by r2, the outer diameter of the second protective layer 720 can be represented by R2, the inner diameter of the pipe body 610 can be represented by r3, and the outer diameter of the pipe body 610 can be represented by R3.

[0110] In some implementations, such as Figure 6 and Figure 7 As shown, the second protective layer 720 is disposed between the outer surface 620 of the pipe body 610 and the first protective layer 710. In a plane perpendicular to the extension direction of the pipe body 610, the inner diameter r1 of the first protective layer 710 and the outer diameter R2 of the second protective layer 720 satisfy: r1-R2≥1mm, and the inner diameter r2 of the second protective layer 720 and the outer diameter R3 of the pipe body 610 satisfy: r2-R3≥1mm.

[0111] For example, on a plane perpendicular to the extending direction of the pipe body 610, the difference r1-R2 between the inner diameter r1 of the first protective layer 710 and the outer diameter R2 of the second protective layer 720 can be set to 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 3mm, 4mm, 5mm, etc., or its value is within the range obtained by any combination of the above two values. For example, the difference r2-R3 between the inner diameter r2 of the second protective layer 720 and the outer diameter R3 of the pipe body 610 can be set to 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 3mm, 4mm, 5mm, etc., or its value is within the range obtained by any combination of the above two values.

[0112] In this embodiment, the second protective layer 720 is disposed between the outer surface 620 of the pipe body 610 and the first protective layer 710. On a plane perpendicular to the extension direction of the pipe body 610, the inner diameter r1 of the first protective layer 710 and the outer diameter R2 of the second protective layer 720 are set to satisfy: r1-R2≥1mm, and the inner diameter r2 of the second protective layer 720 and the outer diameter R3 of the pipe body 610 are set to satisfy: r2-R3≥1mm. This facilitates the assembly of the first protective layer 710, the second protective layer 720 and the pipe body 610, thereby improving the performance of the heat exchange device 60.

[0113] In some implementations, such as Figure 6 As shown, the second protective layer 720 is disposed between the outer surface 620 of the corrugated pipe 610 and the first protective layer 710. Along the extension direction of the pipe body 610, the length L1 of the first protective layer 710 and the length L2 of the second protective layer 720 satisfy: L1≥L2, and the length L2 of the second protective layer 720 and the length L3 of the corrugated pipe 640 satisfy: L2-L3≥5mm.

[0114] For example, the difference L2-L3 between the length L2 of the second protective layer 720 and the length L3 of the corrugated pipe 640 can be set to 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or its value is within the range obtained by any combination of the above two values.

[0115] In this embodiment, the second protective layer 720 is disposed between the outer surface 620 of the corrugated pipe 610 and the first protective layer 710. Along the extension direction of the pipe body 610, the length L1 of the first protective layer 710 and the length L2 of the second protective layer 720 are set to satisfy: L1≥L2, and the length L2 of the second protective layer 720 and the length L3 of the corrugated pipe 640 are set to satisfy: L3-L1≥5mm. This balances the protective performance of the corrugated pipe 640 with the assembly tolerances between the first protective layer 710, the second protective layer 720 and the corrugated pipe 640, thereby improving the performance of the heat exchange device 60.

[0116] In some implementations, such as Figure 8 and Figure 9 As shown, the first protective layer 710 and the second protective layer 720 are an integral structure 70.

[0117] It should be understood that, in the embodiments of this application, the first protective layer 710 and the second protective layer 720 of the pipeline body being an integral structure 70 can mean that the first protective layer 710, which is used to block the emissions emitted by the battery cell 20 from impacting the pipeline body 610, and the second protective layer 720, which is used to achieve thermal isolation of the pipeline body 610, are formed by hot pressing or fixed connection, so that the first protective layer 710 and the second protective layer 720 form an integral structure, thereby wrapping the outer surface 620 of the pipeline body 610 to protect the pipeline body 610.

[0118] In this embodiment, by setting the first protective layer 710 and the second protective layer 720 as an integrated structure 70, the integrated structure 70 can both block the impact of the emissions from the battery cell 20 on the pipeline body 610 and provide thermal insulation to the pipeline body 610. This reduces the space occupied by the integrated structure 70 in the first receiving cavity 50, increases the energy density of the battery cell 20, thereby improving the performance of the battery device 10 and saving assembly time.

[0119] In some implementations, the maximum thickness D1 of the integral structure 70 satisfies: 0mm < D1 ≤ 1mm.

[0120] For example, the maximum thickness D1 of the integral structure 70 can be set to 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc., or its value is within the range obtained by any combination of the above two values.

[0121] In this embodiment, by setting the first protective layer 710 and the second protective layer 720 as an integral structure 70, and setting the maximum thickness D1 of the integral structure 70 to satisfy: 0mm < D1 ≤ 1mm, in order to take into account both the performance of the integral structure 70 in blocking the impact of the emissions discharged by the battery cell 20 on the pipeline body 610 and the performance in thermally isolating the pipeline body 610, the thickness of the integral structure 70 can also be adjusted to reduce the internal space occupied by the pipeline body 610 in the first receiving cavity 50, thereby increasing the energy density of the battery cell 20, thereby improving the performance of the battery device 10, and saving assembly process.

[0122] It should be understood that, such as Figure 10 and Figure 11 As shown, when the first protective layer 710 is disposed on the outer surface 620 of the pipe body 610 and the second protective layer 720 is disposed on the inner surface 630 of the pipe body 610, the inner diameter of the first protective layer 710 in this embodiment can be represented by r4, the outer diameter of the first protective layer 710 can be represented by R4, the inner diameter of the second protective layer 720 can be represented by r5, the outer diameter of the second protective layer 720 can be represented by R5, the inner diameter of the pipe body 610 can be represented by r6, and the outer diameter of the pipe body 610 can be represented by R6.

[0123] In some implementations, such as Figure 10 and Figure 11 As shown, the first protective layer 710 is disposed on the outer surface 620 of the pipe body 610, and the second protective layer 720 is disposed on the inner surface 630 of the pipe body 610. In a plane perpendicular to the extension direction of the pipe body 610, the inner diameter r4 of the first protective layer 710 and the outer diameter R6 of the pipe body 610 satisfy: r4-R6≥1mm, and the outer diameter R5 of the second protective layer 720 and the inner diameter r6 of the pipe body 610 satisfy: 0mm≤r6-R5≤1mm.

[0124] For example, the difference r4-R6 between the inner diameter r4 of the first protective layer 710 and the outer diameter R6 of the pipe body 610 can be set to 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, 3mm, 4mm, 5mm, etc., or its value is within the range obtained by any combination of the above two values.

[0125] For example, the difference r6-R5 between the outer diameter R5 of the second protective layer 720 and the inner diameter r6 of the pipe body 610 can be set to: 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc., or its value is within the range obtained by any combination of the above two values. It should be understood that when the difference r6-R5 between the outer diameter R5 of the second protective layer 720 and the inner diameter r6 of the pipe body 610 is equal to 0mm, the second protective layer 720 is fixedly connected to the inner surface 630 of the pipe body 610.

[0126] In this embodiment, the first protective layer 710 is disposed on the outer surface 620 of the pipe body 610, and the second protective layer 720 is disposed on the inner surface 630 of the pipe body 610. On a plane perpendicular to the extension direction of the pipe body 610, the inner diameter r4 of the first protective layer 710 and the outer diameter R6 of the pipe body 610 are set to satisfy: r4-R6≥1mm, and the outer diameter R5 of the second protective layer 720 and the inner diameter r6 of the pipe body 610 are set to satisfy: 0mm≤r6-R5≤1mm. This facilitates the assembly between the first protective layer 710, the second protective layer 720, and the pipe body 610, thereby improving the performance of the heat exchange device 60.

[0127] In some implementations, such as Figure 10 As shown, the first protective layer 710 is disposed on the outer surface of the corrugated pipe 640, and the second protective layer 720 is disposed on the inner surface of the corrugated pipe 640. Along the extension direction of the pipe body 610, the length L4 of the first protective layer 710 and the length L6 of the corrugated pipe 640 satisfy: L4-L6≥5mm, and the length L5 of the second protective layer 720 and the length L6 of the corrugated pipe 640 satisfy: L5-L6≥5mm.

[0128] For example, the difference L4-L6 between the length L4 of the first protective layer 710 and the length L6 of the corrugated pipe 640 can be set to 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or its value is within the range obtained by any combination of the above two values. The difference L5-L6 between the length L5 of the second protective layer 720 and the length L6 of the corrugated pipe 640 can be set to 5mm, 5.2mm, 5.4mm, 5.6mm, 5.8mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc., or its value is within the range obtained by any combination of the above two values.

[0129] In this embodiment, the first protective layer 710 is disposed on the outer surface of the corrugated pipe 640, and the second protective layer 720 is disposed on the inner surface of the corrugated pipe 640. Along the extension direction of the pipe body 610, the length L4 of the first protective layer 710 and the length L6 of the corrugated pipe 640 are satisfied that L4-L6≥5mm, and the length L5 of the second protective layer 720 and the length L6 of the corrugated pipe 640 are satisfied that L5-L6≥5mm. This balances the protective performance of the corrugated pipe 640 with the assembly tolerances between the first protective layer 710, the second protective layer 720, and the corrugated pipe 640, thereby improving the performance of the heat exchange device 60.

[0130] In some implementations, the second protective layer 720 is thermally fused or bonded to the inner surface 630 of the pipe body 610.

[0131] It should be understood that when the second protective layer 720 is heat-fused or bonded to the inner surface 630 of the pipe body 610, the difference r6-R5 between the outer diameter R5 of the second protective layer 720 and the inner diameter r6 of the pipe body 610 on a plane perpendicular to the extension direction of the pipe body 610 can be 0 mm.

[0132] In this embodiment, the second protective layer 720 is heat-fused or bonded to the inner surface 630 of the pipe body 610 to balance the performance of the pipe body 610 and the bonding strength between the second protective layer 720 and the inner surface 630 of the pipe body 610. At the same time, this connection method is simple and easy to process and manufacture.

[0133] In some implementations, the material of the first protective layer 710 has a heat resistance temperature greater than or equal to 500°C, and / or the material of the second protective layer 720 has a heat resistance temperature greater than or equal to 500°C.

[0134] It should be understood that the heat resistance temperature of the material in the embodiments of this application refers to the highest temperature that the material can withstand. Below the heat resistance temperature, the material will not undergo any physical or chemical changes or damage.

[0135] When testing the material of the first protective layer 710, a portion of the material can be obtained, for example, by cutting off a certain area of ​​the first protective layer 710. A flame torch is used to control the temperature of the outer surface of the first protective layer 710 to be greater than or equal to 800°C for 20 seconds. The surface of the first protective layer 710 is then checked for perforation. If no perforation occurs, the material of the first protective layer 710 meets the usage requirements. Alternatively, when testing the material of the second protective layer 720, a portion of the material can be obtained, for example, by cutting off a certain area of ​​the second protective layer 720. A flame torch is used to control the temperature of the outer surface of the second protective layer 720 to be greater than or equal to 800°C for 20 seconds. The surface of the second protective layer 720 is then checked for perforation. If no perforation occurs, the material of the second protective layer 720 meets the usage requirements.

[0136] It should also be understood that, since the first protective layer 710 is used to block the impact of the emissions from the battery cell 20 on the pipeline body 610, the temperature of the first protective layer 710 itself will continuously increase during the protection process of the pipeline body 610. By setting a second protective layer 720 with a suitable heat resistance temperature, at least part of the pipeline body 610 can be thermally isolated, reducing the risk of leakage caused by the high temperature environment inside the battery device 10 causing the surface of the pipeline body 610 to be burned or melted through, thereby improving the performance of the heat exchange device 60.

[0137] In this embodiment of the application, by setting the heat resistance temperature of the material of the first protective layer to be greater than or equal to 500°C, and / or setting the heat resistance temperature of the material of the second protective layer 720 to be greater than or equal to 500°C, the thermal insulation performance of the second protective layer 720 and the thermal influence of the first protective layer 710 on the second protective layer 720 are taken into account. This reduces the risk of the first protective layer 710 causing ablation or melt-through to the second protective layer 720 during the heating process, thereby effectively protecting the pipeline body 610 and improving the performance of the heat exchange device 60.

[0138] In some implementations, the material of the second protective layer 720 includes at least one of the following materials: glass fiber, mica sheet, aerogel, and pre-oxidized fiber.

[0139] In this embodiment of the application, by setting the material of the second protective layer 720 to include at least one of the following materials: glass fiber, mica sheet, aerogel, and pre-oxidized fiber, the thermal insulation performance of the second protective layer 720 is effectively improved, so as to provide thermal insulation to the pipeline body 610, thereby improving the performance of the heat exchange device 60.

[0140] In some implementations, the material of the first protective layer 710 includes: a phase change material or a ceramicized composite strip.

[0141] It should be understood that the phase change materials in the embodiments of this application refer to materials that store and release heat through phase changes such as melting, solidification, evaporation, and condensation at a specific temperature. These materials can absorb or release a large amount of heat energy when the temperature changes, and are therefore widely used in applications such as temperature regulation, thermal management, and energy storage. Specifically, each phase change material has a specific phase change temperature at which the material undergoes a phase change, thereby storing or releasing heat. During the phase change process, the material can absorb or release a large amount of heat energy, and although the temperature change is not large, the energy transfer efficiency is high. Phase change materials can undergo phase change processes multiple times without significant performance degradation. The ceramicized composite tape in the embodiments of this application can be coated and calendered with ceramic fire-resistant and fire-resistant silicone rubber and high-temperature resistant fiberglass cloth as substrates.

[0142] In this embodiment of the application, by setting the material of the first protective layer 710 to include: phase change material or ceramic composite tape, the performance of resisting or blocking the high temperature or high pressure gas discharged from the battery cell 20 is effectively improved in the event of thermal runaway of the battery cell 20, so as to effectively protect the pipeline body 610 and thereby improve the performance of the heat exchange device 60.

[0143] In some implementations, such as Figure 5 As shown, the heat exchange device 60 also includes a heat exchange plate 750 and two pipe bodies 610. The surface of the housing 11 is provided with an inlet 730 and an outlet 740 that communicate with the outside. One end of the first pipe body 611 of the two pipe bodies 610 is connected to the inlet 730, and the other end of the first pipe body 611 is connected to the heat exchange plate 750. One end of the second pipe body 612 of the two pipe bodies 610 is connected to the outlet 740, and the other end of the second pipe body 612 is connected to the heat exchange plate 750.

[0144] It should be understood that, in this embodiment, the external device located outside the housing 11 can exchange heat with the battery cells 20 inside the battery device 10 through the inlet 730 and outlet 740 provided on the housing 11. The heat exchange medium generated by the external device can flow into the pipeline body 610 through the inlet 730 and carry away the heat generated by the battery device 10 through heat conduction. The heat exchange medium flows out to the external device through the outlet 740. That is, a circulation loop for the heat exchange medium is formed between the external device and the pipeline body 610 to continuously regulate the temperature of the battery device 10. It should also be understood that the external device may include a heat exchanger and a pump. The heat exchanger is used to cool the heat exchange medium flowing out through the outlet 740, and the pump is used to return the cooled heat exchange medium to the pipeline body 610 through the inlet 730 to continuously regulate the temperature of the battery device 10.

[0145] In this embodiment, the heat exchange device 60 is configured to include a heat exchange plate 750 and two pipe bodies 610, and the surface of the housing 11 is provided with an inlet 730 and an outlet 740 communicating with the outside. One end of the first pipe body 611 of the two pipe bodies 610 is connected to the inlet 730, and the other end of the first pipe body 611 is connected to the heat exchange plate 750. One end of the second pipe body 612 of the two pipe bodies 610 is connected to the outlet 740, and the other end of the second pipe body 612 is connected to the heat exchange plate 750. That is, the heat exchange medium provided by the external device can circulate between the heat exchange device 60 and the outside of the housing 11 through the inlet 730 and the outlet 740, so as to facilitate heat exchange with the battery cell 20, reduce the risk of thermal runaway of the battery cell 20, and improve the performance of the battery device 10.

[0146] According to some embodiments of this application, this application also provides an electrical device, including the battery device 10 in any of the above embodiments, the battery device 10 being used to provide electrical energy to the electrical device. Specifically, the electrical device can be... Figure 1 The vehicle 1 shown can also be any electrical device that uses the battery device 10.

[0147] The electrical equipment can be any of the aforementioned devices or systems that utilize the battery device 10.

[0148] According to some embodiments of this application, see Figures 5 to 11This application provides a battery device 10, which includes: a housing 11, a battery cell 20, and a heat exchange device 60. The housing 11 has a first receiving cavity 50; the battery cell 20 is received in the first receiving cavity 50, and the heat exchange device 60 is received in the first receiving cavity 50 and disposed close to the battery cell 20. The heat exchange device 60 is used to exchange heat with the battery cell 20; the heat exchange device 60 includes a pipeline body 610 for receiving a heat exchange medium and an outer casing disposed on the pipeline body 610. The heat exchange device 60 includes a first protective layer 710 on surface 620, which is used to block the impact of emissions from the battery cell 20 on the pipe body 610. The heat exchange device 60 also includes a second protective layer 720, which is disposed between the outer surface 620 of the pipe body 610 and the first protective layer 710, and / or, the second protective layer 720 is disposed on the inner surface 630 of the pipe body 610, serving to provide thermal insulation to the pipe body 610. At least a portion of the pipe body 610 includes a corrugated pipe 640, and the second protective layer 720 covers the corrugated pipe 640. The second protective layer 720 is disposed between the outer surface 620 of the pipe body 610 and the first protective layer 710. Specifically, in a plane perpendicular to the extension direction of the pipe body 610, the inner diameter r1 of the first protective layer 710 and the outer diameter R2 of the second protective layer 720 satisfy: r1 - R2 ≥ 1 mm, and the inner diameter r2 of the second protective layer 720 and the outer diameter R3 of the pipe body 610 satisfy: r2 - R3 ≥ 1 mm. Along the extension direction of the pipe body 610, the length L1 of the first protective layer 710 and the length L2 of the second protective layer 720 satisfy: L1 ≥ L2, and the length L2 of the second protective layer 720 and the length L3 of the corrugated pipe 640 satisfy: L2 - L3 ≥ 5 mm.

[0149] 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: The housing has a first receiving cavity; A single battery cell is housed in the first receiving cavity; A heat exchange device is housed in the first receiving cavity and disposed close to the battery cell, the heat exchange device being used to exchange heat with the battery cell; The heat exchange device includes a pipeline body that contains a heat exchange medium and a first protective layer disposed on the outer surface of the pipeline body. The first protective layer is used to prevent the emissions from the battery cells from impacting the pipeline body. The heat exchange device further includes a second protective layer, which is disposed between the outer surface of the pipeline body and the first protective layer, and / or the second protective layer is disposed on the inner surface of the pipeline body, and the second protective layer is used to thermally insulate the pipeline body.

2. The battery device according to claim 1, characterized in that, At least a portion of the pipeline body includes a corrugated pipe, and the second protective layer covers the corrugated pipe.

3. The battery device according to claim 2, characterized in that, The second protective layer is disposed between the outer surface of the pipeline body and the first protective layer. Wherein, on a plane perpendicular to the extension direction of the pipeline body, the inner diameter r1 of the first protective layer and the outer diameter R2 of the second protective layer satisfy: r1-R2≥1mm, and the inner diameter r2 of the second protective layer and the outer diameter R3 of the pipeline body satisfy: r2-R3≥1mm.

4. The battery device according to claim 2 or 3, characterized in that, The second protective layer is disposed between the outer surface of the corrugated pipe and the first protective layer. Wherein, along the extension direction of the pipeline body, the length L1 of the first protective layer and the length L2 of the second protective layer satisfy: L1≥L2, and the length L2 of the second protective layer and the length L3 of the corrugated pipeline satisfy: L2-L3≥5mm.

5. The battery device according to claim 3 or 4, characterized in that, The first protective layer and the second protective layer are an integral structure.

6. The battery device according to claim 5, characterized in that, The maximum thickness D1 of the integrated structure satisfies: 0mm < D1 ≤ 1mm.

7. The battery device according to claim 2, characterized in that, The first protective layer is disposed on the outer surface of the pipe body, and the second protective layer is disposed on the inner surface of the corrugated pipe. Specifically, on a plane perpendicular to the extension direction of the pipeline body, the inner diameter r4 of the first protective layer and the outer diameter R6 of the pipeline body satisfy: r4-R6≥1mm, and the outer diameter R5 of the second protective layer and the inner diameter r6 of the pipeline body satisfy: 0mm≤r6-R5≤1mm.

8. The battery device according to claim 2 or 7, characterized in that, The first protective layer is disposed on the outer surface of the corrugated pipe, and the second protective layer is disposed on the inner surface of the corrugated pipe. Wherein, along the extension direction of the pipeline body, the length L4 of the first protective layer and the length L6 of the corrugated pipeline satisfy: L4-L6≥5mm, and the length L5 of the second protective layer and the length L6 of the corrugated pipeline satisfy: L5-L6≥5mm.

9. The battery device according to claim 7 or 8, characterized in that, The second protective layer is thermally fused or bonded to the inner surface of the pipeline body.

10. The battery device according to any one of claims 1 to 9, characterized in that, The material of the first protective layer has a heat resistance temperature greater than or equal to 500°C, and / or The heat resistance temperature of the material of the second protective layer is greater than or equal to 500℃.

11. The battery device according to any one of claims 1 to 10, characterized in that, The material of the second protective layer includes at least one of the following materials: glass fiber, mica sheet, aerogel, and pre-oxidized fiber.

12. The battery device according to any one of claims 1 to 11, characterized in that, The material of the first protective layer includes: phase change material or ceramic composite tape.

13. The battery device according to any one of claims 1 to 12, characterized in that, The heat exchange device further includes a heat exchange plate and two pipe bodies. The surface of the housing is provided with an inlet and an outlet that communicate with the outside. One end of the first pipe body is connected to the inlet, and the other end of the first pipe body is connected to the heat exchange plate. One end of the second pipe body is connected to the outlet, and the other end of the second pipe body is connected to the heat exchange plate.

14. An electrical appliance, characterized in that, include: The battery device according to any one of claims 1 to 13, wherein the battery device is used to provide electrical energy to the electrical device.

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