Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of batteries, the battery device comprises a box body and single batteries, the box body is provided with a bottom plate assembly, the bottom plate assembly comprises an inner lining plate and a bottom protection plate which are stacked in the thickness direction of the bottom plate assembly, and the inner lining plate is located on the side, facing the interior of the box body, of the bottom protection plate; the battery monomers are arranged in the box body and are mounted on the inner lining plate; the inner lining plate comprises a heat exchange part, the heat exchange part is used for carrying out heat exchange with the battery monomers, a cavity is formed between the inner lining plate and the bottom protection plate, the cavity comprises a first cavity body corresponding to the heat exchange part and a second cavity body staggered with the heat exchange part, and the first cavity body is provided with a first buffer part. According to the technical scheme provided by the invention, the first cavity is arranged corresponding to the heat exchange part, and the first buffer part is arranged in the first cavity, so that when the bottom protection plate is impacted, the first buffer part can perform energy absorption protection on the heat exchange part, and the problem that the heat exchange part at the bottom of the single battery in the current battery device is easy to fail is solved.

Description

Technical Field

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

[0002] In existing battery devices for new energy vehicles, a heat exchange unit is typically installed at the bottom of the battery cell. This heat exchange unit exchanges heat with the battery cell, allowing the battery cell to operate within an efficient temperature range. However, the heat exchange unit in current battery devices is prone to failure, resulting in reduced reliability of the battery device. Utility Model Content

[0003] The main purpose of this application is to propose a battery device and an electrical device, aiming to improve the problem that the heat exchange part at the bottom of the battery cell in the current battery device is prone to failure.

[0004] In a first aspect, the battery device proposed in this application includes:

[0005] A box body, the box body having a bottom plate assembly, the bottom plate assembly including an inner lining plate and a bottom guard plate stacked along the thickness direction thereof, the inner lining plate being located on a side of the bottom guard plate facing the interior of the box body; and

[0006] A battery cell is disposed in the box and mounted on the inner lining plate;

[0007] Among them, the inner lining plate includes a heat exchange part, which is used to exchange heat with the battery cell. There is a cavity between the inner lining plate and the bottom guard plate. The cavity includes a first cavity corresponding to the heat exchange part and a second cavity staggered from the heat exchange part. The first cavity is provided with a first buffer part.

[0008] In the technical solution provided in the present application, there is a cavity between the inner lining plate and the bottom guard plate. When the bottom guard plate encounters a collision impact, the cavity can provide sufficient buffer space for the battery cell to reduce the degree of damage to the battery cell. On this basis, the cavity also includes a first cavity corresponding to the heat exchange part, and a second cavity staggered from the heat exchange part. A first buffer part is arranged in the first cavity. The first buffer part can provide targeted energy absorption protection for the heat exchange part when the bottom guard plate is deformed, thereby improving the problem that the heat exchange part at the bottom of the battery cell in the current battery device is prone to failure when encountering a collision impact, ensuring the service life of the heat exchange part, and improving the reliability of the battery device.

[0009] In some embodiments, the first buffer portion is connected to both the bottom guard plate and the inner lining plate.

[0010] In the above technical solution, the bottom guard plate and the inner lining plate are connected by the first buffer portion, which is beneficial to improving the overall rigidity and modality of the bottom plate assembly and preventing a large area of ​​overhang between the inner lining plate and the bottom guard plate.

[0011] In some embodiments, a second buffer portion is provided in the second cavity;

[0012] Wherein, the hardness of the second buffer portion is smaller than the hardness of the first buffer portion.

[0013] In the above technical solution, a second buffer portion is provided in the second cavity, and the hardness of the second buffer portion is less than that of the first buffer portion. The second buffer portion can enhance the impact protection performance of other areas of the inner lining plate except the heat exchange portion to a certain extent, so that the impact protection performance of various areas of the inner lining plate is evenly distributed.

[0014] In some embodiments, the bottom guard plate has a raised area protruding toward the inner lining plate at a position corresponding to the first cavity;

[0015] The first buffer portion is disposed between the heat exchange portion and the raised area of ​​the bottom guard plate.

[0016] In the above technical solution, the bottom guard plate has a raised area. On the one hand, the existence of the raised area can increase the rigidity and modality of the bottom guard plate. On the other hand, the raised area appears as a groove on the side of the bottom guard plate facing away from the inner lining plate, which reduces the probability of the raised area being subjected to direct impact.

[0017] In some embodiments, a heat exchange channel is formed inside the lining plate, and the heat exchange portion includes the heat exchange channel.

[0018] In the above technical solution, heat exchange fluid can be introduced into the inner lining plate through the heat exchange flow channel, which can simultaneously heat the battery cells and dissipate heat and cool the battery cells.

[0019] In some embodiments, the inner lining plate is provided in a convex manner at least toward one side of the bottom guard plate in the area where the heat exchange flow channel is formed.

[0020] In the above technical solution, the inner lining plate is raised toward one side of the bottom guard plate in the area where the heat exchange flow channel is formed, so that the forming of the heat exchange flow channel can make full use of the raised part, that is, the flow rate of the heat exchange flow channel can be guaranteed. On this basis, the area on the inner lining plate that is staggered from the heat exchange flow channel can be appropriately thinned to reduce the overall quality of the inner lining plate.

[0021] In some embodiments, the lining plate comprises:

[0022] A first plate body, supporting the battery cell; and

[0023] The second plate body is arranged on the side of the first plate body facing the bottom guard plate, and the second plate body is attached to the first plate body at the second cavity. The second plate body is provided with a protrusion at the first cavity, and the protrusion and the first plate body jointly define the heat exchange channel.

[0024] Compared with the traditional method of directly casting the heat exchange channel, in the above technical solution, the protrusion and the first plate body jointly define the heat exchange channel, and the second plate body is equivalent to the protrusion formed by stamping. On this basis, the first plate body and the second plate body are fitted and connected at the position corresponding to the second cavity, thereby forming an inner lining plate with a heat exchange channel. This processing method can ensure the structural integrity and processing accuracy of the complex heat exchange channel.

[0025] In some embodiments, the inner lining plate further includes a lining plate body, and the heat exchange portion is disposed on a side of the lining plate body facing the battery cell and abuts against the battery cell.

[0026] In the above technical solution, the inner lining plate is composed of a lining plate body and a heat exchange part. The lining plate body mainly provides an installation basis for the heat exchange part, which can greatly reduce the processing difficulty of the inner lining plate with the heat exchange part. Not only that, under the impact condition, when the impact force borne by the bottom guard plate is transmitted to the inner lining plate, the lining plate body can first deform and absorb a large part of the impact force, and the impact force finally transmitted to the heat exchange part is greatly weakened, thereby improving the impact protection effect of the heat exchange part.

[0027] In some embodiments, the heat exchange portion includes a heating film or a heat exchange tube.

[0028] In the above technical solution, the heating film occupies less space inside the box, which helps to improve the energy density of the battery device, and the heating accuracy of the heating film is usually high, which has a better thermal management effect on the battery cell; the heat exchange tube is usually a tubular structure, and there is usually a cavity inside it for the heat exchange liquid to circulate. Therefore, when the heat exchange tube encounters an impact, it can absorb energy through its own collapse, and can not only exchange heat with the battery cell, but also provide impact protection for the battery cell.

[0029] In some embodiments, a receiving recess is provided on a side of the liner body close to the battery cell, and the heat exchange portion is provided in the receiving recess.

[0030] In the above technical solution, a receiving recess is formed on the liner body by stamping, and the heat exchange part is arranged in the receiving recess. On the one hand, the rigidity and modality of the liner body can be improved, and on the other hand, it is also beneficial to the positioning and installation of the heat exchange part.

[0031] In some embodiments, the lining plate body has a support area adjacent to the accommodating recess, and an inner surface of the support area is flush with a surface of the heat exchange portion.

[0032] In the above technical solution, the inner surface of the supporting area of ​​the lining plate body is set flush with the surface of the heat exchange part, so that the inner surface of the heat exchange part and the inner surface of the supporting area can simultaneously participate in abutting the battery cell, which is beneficial to improving the supporting stability of the inner lining plate for the battery cell, and at the same time can also reduce the bearing pressure of the heat exchange part.

[0033] In a second aspect, the present application further proposes an electrical device comprising the above-mentioned battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0035] Figure 1 A simplified structural diagram of an embodiment in which the electrical equipment provided in this application is a vehicle;

[0036] Figure 2 A schematic diagram of the exploded structure of an embodiment of the battery device provided in this application;

[0037] Figure 3 A schematic top view of another embodiment of the battery device provided in this application;

[0038] Figure 4 for Figure 3 A schematic structural diagram of an embodiment of the middle box;

[0039] Figure 5 for Figure 4 Structural diagram of the middle section A;

[0040] Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the part B in the middle;

[0041] Figure 7 for Figure 3 A schematic structural diagram of another embodiment of the middle box;

[0042] Figure 8 for Figure 7 Structural diagram of the middle section C;

[0043] Figure 9 for Figure 8Schematic diagram of the enlarged structure of local D in the middle.

[0044] Description of Figure Numbers:

[0045] 1000. Vehicle;

[0046] 100, battery device; 200, controller; 300, motor;

[0047] 1. Box body; 11. Box body; 12. Box cover; 13. Bottom plate assembly; 13a. Cavity; 131a. First cavity; 132a. Second cavity; 131. Inner lining plate; 1311. Liner body; 1311a. Accommodating recess; 1311b. Support area; 1312. First plate; 1313. Second plate; 1313a. Protrusion; 1314. Heat exchange unit; 1314a. Heat exchange channel; 1314b. Heat exchange tube; 132. Bottom guard plate; 1321. Raised area; 2. Battery cell; 31. First buffer; 32. Second buffer

[0048] X, thickness direction.

[0049] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0052] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0053] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0054] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0055] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0056] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0057] The battery device disclosed in the embodiments of the present application can be used to provide power to electrical devices, wherein the electrical devices may be, but are not limited to, battery vehicles, electric vehicles, ships, spacecraft, etc. Among them, spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0058] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0059] Please refer to Figure 1 , Figure 1The electrical equipment provided for this application is a simplified structural diagram of an embodiment of a vehicle 1000. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000. For example, the battery device 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0060] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0061] For easier understanding of the battery device 100 provided in this application, please refer to Figure 2 , Figure 2 This is a schematic diagram of the exploded structure of an embodiment of the battery device 100 provided in this application. The battery device 100 generally includes a box body 1 and a battery cell 2. An installation cavity is formed in the box body 1, and the battery cell 2 is loaded through the installation cavity. The basic structure of the box body 1 generally includes a box body 11 and a box cover 12. The box cover 12 is arranged on the box body 11 and together with the box body 11 define the installation cavity. Generally speaking, the battery cell 2 is generally arranged in the box body 11. After the battery device 100 is mounted on the vehicle 1000, the box cover 12 is generally close to the vehicle 1000, and the box body 11 is generally away from the vehicle 1000; the installation cavity can be mainly formed in the box body 11. In this case, the box body 11 can be understood as a basin-shaped structure, and the box cover 12 is covered on the box body 11 to cover the installation cavity; the installation cavity can also be mainly formed in the box cover 12. In this case, the box cover 12 can be understood as a cover-shaped structure. The box cover 12 is covered on the box body 11 to cover the battery cell 2 carried on the box body 11 into the box cover 12. Of course, the structure of the box body 1 is not limited to this.

[0062] The number of battery cells 2 in the box 1 can be one or more. When multiple battery cells 2 are provided, the multiple battery cells 2 can be connected in series, in parallel, or in a mixed connection. Mixed connection means that multiple battery cells 2 are both connected in series and in parallel. Multiple battery cells 2 can be directly connected in series, in parallel, or in a mixed connection to form a battery as a whole. Of course, multiple battery cells 2 can also be in the form of battery modules that are first connected in series, in parallel, or in a mixed connection, and multiple battery modules are then connected in series, in parallel, or in a mixed connection to form a battery as a whole. The battery device 100 can also include other structures, such as a busbar component, for achieving electrical connection between multiple battery cells 2 or multiple battery modules. Each battery cell 2 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 2 can be cylindrical, flat, rectangular, or in other shapes.

[0063] In the present application, battery cells 2 may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the present application embodiments do not limit this. Battery cells 2 may be cylindrical, flat, rectangular, or in other shapes, etc., and the present application embodiments do not limit this. Battery cells 2 are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the present application embodiments do not limit this.

[0064] The structure of a battery cell 2 generally includes a shell, an end cap, an electrode assembly, and electrode terminals. The end cap is positioned over the opening of the shell and, together with the shell, defines a housing cavity. The electrode assembly is positioned within the housing cavity. The electrode terminal extends through the end cap and is electrically connected to the electrode assembly's tabs via a transition component. The electrode assembly is the component within the battery cell 2 where electrochemical reactions occur. It is primarily formed by winding or stacking positive and negative electrode sheets, and a separator is typically provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative electrode tabs can be located together at one end of the main body or separately at both ends of the main body. During the battery's charge and discharge processes, the positive and negative electrode active materials react with the electrolyte filled within the shell.

[0065] In the battery devices of existing new energy vehicles, a heat exchange part is usually set at the bottom of the battery cell. The heat exchange part is used to perform heat exchange on the battery cell, so that the battery cell operates in an efficient temperature range. At the same time, in order to provide protection for the battery device, current battery manufacturers usually set a bottom plate assembly at the bottom of the battery device box to support and impact-protect the battery cell inside the box with the help of the bottom plate assembly. However, most current battery devices only focus on the impact protection design of the battery cell, and ignore the importance of impact protection of the heat exchange part. When the bottom plate assembly encounters external impact, the heat exchange part is more likely to deform before the battery cell, resulting in heat exchange failure, which in turn leads to reduced reliability of the battery device.

[0066] Therefore, it is possible to consider adding impact protection settings for the heat exchange part based on the layout of the existing battery device. Since most of the current bottom plate assemblies include an inner lining plate and a bottom guard plate, and a cavity is retained between the inner lining plate and the bottom guard plate, the cavity can provide energy absorption protection. On this basis, it is possible to consider setting an additional buffer structure at the position corresponding to the heat exchange part in the cavity to deliberately enhance the impact protection performance of the bottom plate assembly at the position of the heat exchange part.

[0067] In view of this, the present application provides a battery device. Applying the battery device provided by the present application to a vehicle can at least improve the problem of the heat exchange portion at the bottom of the battery cell of the current battery device being prone to failure.

[0068] To facilitate understanding of the battery device provided by the present application, the following description is provided with reference to the accompanying drawings, wherein: Figure 3 A schematic top view of another embodiment of the battery device provided in this application; Figure 4 for Figure 3 A schematic structural diagram of an embodiment of the middle box; Figure 5 for Figure 4 Structural diagram of the middle section A; Figure 6 for Figure 5 Schematic diagram of the enlarged structure of the part B in the middle; Figure 7 for Figure 3 A schematic structural diagram of another embodiment of the middle box; Figure 8 for Figure 7 Structural diagram of the middle section C; Figure 9 for Figure 8 Schematic diagram of the enlarged structure of local D in the middle.

[0069] See also Figures 3 to 5In one embodiment of the present application, the battery device 100 includes a box body 1 and a battery cell 2. The box body 1 has a bottom plate assembly 13. The bottom plate assembly 13 includes an inner lining plate 131 and a bottom guard plate 132 stacked along its thickness direction X. The inner lining plate 131 is located on the side of the bottom guard plate 132 facing the interior of the box body 1; the battery cell 2 is arranged in the box body 1 and mounted on the inner lining plate 131; the inner lining plate 131 includes a heat exchange portion 1314, the heat exchange portion 1314 is used to exchange heat with the battery cell 2, and a cavity 13a is provided between the inner lining plate 131 and the bottom guard plate 132. The cavity 13a includes a first cavity 131a corresponding to the heat exchange portion 1314, and a second cavity 132a staggered from the heat exchange portion 1314. The first cavity 131a is provided with a first buffer portion 31.

[0070] It should be noted that the box body 1 is generally composed of a box cover 12 and a box body 11, and the bottom plate assembly 13 is generally a part of the box body 11. This embodiment defines that the bottom plate assembly 13 has an inner lining plate 131 and a bottom guard plate 132 stacked along its thickness direction X. "The inner lining plate 131 is located on the side of the bottom guard plate 132 facing the inside of the box body 1" means that the inner lining plate 131 is on the inner side of the box body 1, and the bottom guard plate 132 is on the outer side of the box body 1. The inner lining plate 131 usually serves as a plate that directly supports the battery cell 2. For the solution in which the box body 11 includes a frame, the inner lining plate 131 can be directly connected to the frame, and the bottom guard plate 132 can be indirectly connected to the frame through the inner lining plate 131, or the bottom guard plate 132 can be directly connected to the frame, and the inner lining plate 131 can be indirectly connected to the frame through the bottom guard plate 132. This embodiment does not limit this. The thickness direction X of the bottom plate assembly 13 generally refers to the height direction of the box body 1, that is, the direction in which the box cover 12 is connected to the box body 11. "The battery cell 2 is mounted on the inner lining plate 131" means that the inner lining plate 131 supports the battery cell 2, and the battery cell 2 and the inner lining plate 131 may be fixed together by structural adhesive or a locking structure. Of course, the battery cell 2 may also be placed directly on the inner lining plate 131 and fixed by other beam structures within the box body 1.

[0071] Although the inner lining plate 131 is provided with a heat exchange portion 1314 capable of performing heat exchange with the battery cell 2, the inner lining plate 131 should not be limitedly understood as a stamped one-piece heat exchange plate in the battery field. This is because the heat exchange portion 1314 can have many structural types, and this embodiment does not limit this. The main purpose of the embodiment of the present application is also to design impact protection for the heat exchange portion 1314. There is a cavity 13a between the inner lining plate 131 and the bottom guard plate 132. The cavity 13a is generally used as a buffer space. Therefore, the cavity 13a is generally arranged to overlap with the battery cell 2 in the above-mentioned thickness direction X; "the cavity 13a includes a first cavity 131a corresponding to the heat exchange part 1314" means that the first cavity 131a overlaps with the heat exchange part 1314 in the projection of the above-mentioned thickness direction X, and "the cavity 13a includes a second cavity 132a staggered from the heat exchange part 1314" means that the second cavity 132a is staggered from the heat exchange part 1314 in the projection of the above-mentioned thickness direction X, that is, they do not overlap.

[0072] The phrase "the first cavity 131a is provided with a first buffer portion 31" can be understood as meaning that the first buffer portion 31 can be stably maintained within the first cavity 131a. For example, the first buffer portion 31 can be directly or indirectly connected to the bottom guard plate 132 and spaced apart from the inner lining plate 131, or the first buffer portion 31 can be directly or indirectly connected to the inner lining plate 131 and spaced apart from the bottom guard plate 132, or the first buffer portion 31 can be connected to the inner lining plate 131 and the bottom guard plate 132 at both ends in the thickness direction X. The "first buffer portion 31" can fill all of the cavity space of the first cavity 131a or only part of the cavity space of the first cavity 131a, and this is not limited in this embodiment. There are many options for the structural type and material of the "first buffer portion 31", such as a honeycomb structure, a foam structure, a crush energy absorption structure, a spring structure, etc., and this is also not limited in this embodiment.

[0073] In the technical solution provided in the present application, there is a cavity 13a between the inner lining plate 131 and the bottom guard plate 132. When the bottom guard plate 132 encounters a collision impact, the cavity 13a can provide sufficient buffer space for the battery cell 2 to reduce the degree of damage to the battery cell 2. On this basis, the cavity 13a also includes a first cavity 131a corresponding to the heat exchange part 1314, and a second cavity 132a staggered from the heat exchange part 1314. A first buffer part 31 is arranged in the first cavity 131a. The first buffer part 31 can provide targeted energy absorption protection for the heat exchange part 1314 when the bottom guard plate 132 is deformed, thereby improving the problem that the heat exchange part 1314 at the bottom of the battery cell 2 in the current battery device 100 is easily failed when encountering a collision impact, ensuring the service life of the heat exchange part 1314, and also improving the reliability of the battery device 100.

[0074] See also Figure 6 In some embodiments, the first buffer portion 31 is connected to both the bottom guard plate 132 and the inner lining plate 131 .

[0075] It should be noted that there are various possible ways to connect the first buffer portion 31 to the bottom guard plate 132 and the inner lining plate 131. The specific connection method can be selected based on the material of the first buffer portion 31. For example, when the first buffer portion 31 is made of metal, it can be connected by welding. When the first buffer portion 31 is made of cushioning foam, it can be bonded using structural adhesive. To ensure a good connection, the first buffer portion 31 is typically made of a hard material.

[0076] In the above technical solution, the bottom guard plate 132 and the inner lining plate 131 are connected by the first buffer portion 31, which is beneficial to improving the overall rigidity and modality of the bottom plate assembly 13 and preventing a large area of ​​overhang between the inner lining plate 131 and the bottom guard plate 132.

[0077] See also Figure 6 In some embodiments, a second buffer portion 32 is disposed in the second cavity 132 a ; wherein the hardness of the second buffer portion 32 is less than the hardness of the first buffer portion 31 .

[0078] It should be noted that among commonly used buffer structures in battery devices 100, there is generally a correlation between hardness and mass, and between hardness and impact protection effectiveness. The structural type and material selection for the "second buffer portion 32" vary, including honeycomb structures, foam structures, collapse energy absorption structures, spring structures, and the like, and this embodiment does not limit these.

[0079] In the above technical solution, a second buffer portion 32 is provided in the second cavity 132a, and the hardness of the second buffer portion 32 is less than that of the first buffer portion 31. The second buffer portion 32 can enhance the impact protection performance of other areas of the inner lining plate 131 except the heat exchange portion 1314 to a certain extent, replacing the redundant design of providing the first buffer portion 31 in both the first cavity 131a and the second cavity 132a, so that the impact protection performance of various areas of the inner lining plate 131 is evenly distributed.

[0080] See also Figure 6 In some embodiments, at a position corresponding to the first cavity 131a, the bottom guard plate 132 has a raised area 1321 raised toward the inner lining plate 131; the first buffer portion 31 is arranged between the heat exchange portion 1314 and the raised area 1321 of the bottom guard plate 132.

[0081] The "raised area 1321" should not be simply understood as a solid raised structure. Instead, it should be understood as the plate body protruding from the side facing away from the inner liner plate 131 to the side facing the inner liner plate 131 at the raised area 1321, thereby forming a groove on the side facing away from the inner liner plate 131 and a protrusion on the side facing the inner liner plate 131. The phrase "the first buffer portion 31 is disposed between the heat exchange portion 1314 and the raised area 1321 of the bottom guard plate 132" generally means that, in the thickness direction X, the first buffer portion 31 is disposed between the heat exchange portion 1314 of the inner liner plate 131 and the protrusion of the raised area 1321.

[0082] In the above technical solution, the bottom guard plate 132 has a raised area 1321. On the one hand, the existence of the raised area 1321 can increase the rigidity and modality of the bottom guard plate 132. On the other hand, the raised area 1321 appears as a groove on the side of the bottom guard plate 132 facing away from the inner lining plate 131, which reduces the probability of the raised area 1321 being subjected to direct impact.

[0083] See also Figure 6 In some embodiments, a heat exchange channel 1314 a is formed inside the inner lining plate 131 , and the heat exchange portion 1314 includes the heat exchange channel 1314 a .

[0084] It should be noted that the heat exchange channel 1314a is usually arranged in a winding manner and has a channel inlet and a channel outlet for an external circulation device to pass heat exchange fluid. By changing the temperature of the heat exchange fluid, it can heat the battery cell 2 and cool the battery cell 2.

[0085] In the above technical solution, heat exchange fluid can be introduced into the inner lining plate 131 through the heat exchange channel 1314 a , which can simultaneously heat the battery cell 2 and dissipate heat and cool the battery cell 2 .

[0086] In some embodiments, the lining plate 131 is convexly arranged toward at least one side of the bottom guard plate 132 in the area where the heat exchange channel 1314 a is formed.

[0087] This embodiment specifies that "the inner lining plate 131 is provided in a raised manner toward at least one side of the bottom guard plate 132." The inner lining plate 131 may also be provided in a raised manner toward either the bottom guard plate 132 or the battery cell 2. It should be noted that the purpose of the raised inner lining plate 131 is to provide more molding space for the heat exchange channel 1314a, allowing the heat exchange channel 1314a to fully utilize the raised portion of the inner lining plate 131.

[0088] In the above technical solution, the inner lining plate 131 is convexly arranged toward one side of the bottom guard plate 132 in the area where the heat exchange channel 1314a is formed, so that the forming of the heat exchange channel 1314a can make full use of the convex part, that is, the flow rate of the heat exchange channel 1314a can be guaranteed. On this basis, the area on the inner lining plate 131 that is staggered from the heat exchange channel 1314a can be appropriately thinned to reduce the overall quality of the inner lining plate 131.

[0089] Please continue reading Figure 6 In some embodiments, the inner lining plate 131 includes a first plate body 1312 and a second plate body 1313. The first plate body 1312 supports the battery cell 2; the second plate body 1313 is arranged on the side of the first plate body 1312 facing the bottom guard plate 132, and the second plate body 1313 is attached to the first plate body 1312 at the second cavity 132a. The second plate body 1313 is provided with a protrusion 1313a at the first cavity 131a. The protrusion 1313a and the first plate body 1312 jointly define a heat exchange channel 1314a.

[0090] It should be noted that the inner lining plate 131 of this solution is connected by the first plate 1312 and the second plate 1313 at the second cavity 132a, and the shape structure of the protrusion 1313a on the second plate 1313 and the first plate 1312 together define a heat exchange flow channel 1314a. This inner lining plate 131 is generally formed by brazing (a solder is provided between the second plate 1313 and the first plate 1312 at the second cavity 132a. Since the melting point of the solder is lower than that of the second plate 1313 and the first plate 1312, the solder is melted by heating to a corresponding temperature, thereby connecting the second plate 1313 and the first plate 1312). It should also not be ruled out that the second plate body 1313 and the first plate body 1312 are bonded together by coating a sealing structural adhesive at the second cavity 132a; "the second plate body 1313 is provided with a protrusion 1313a at the first cavity 131a", wherein the "protrusion 1313a" refers to the second plate body 1313 protruding toward the bottom guard plate 132 in the area corresponding to the first cavity 131a compared to the area corresponding to the second cavity 132a, thereby forming a cavity between the second plate body 1313 and the first plate body 1312, and the cavity is the heat exchange channel 1314a, wherein the protrusion 1313a of the second plate body 1313 can be formed by stamping.

[0091] Compared with the traditional method of directly casting the heat exchange channel 1314a, in the above technical solution, the protrusion 1313a and the first plate body 1312 jointly define the heat exchange channel 1314a, and the second plate body 1313 is equivalent to forming the protrusion 1313a by stamping. On this basis, the first plate body 1312 and the second plate body 1313 are fitted and connected at the position corresponding to the second cavity 132a, thereby forming the inner lining plate 131 with the heat exchange channel 1314a. This processing method can ensure the structural integrity and processing accuracy of the complex heat exchange channel 1314a.

[0092] See also Figures 7 to 9 In some embodiments, the inner lining plate 131 further includes a lining plate body 1311 , and the heat exchange portion 1314 is disposed on a side of the lining plate body 1311 facing the battery cell 2 and abuts against the battery cell 2 .

[0093] In the above technical solution, the inner lining plate 131 is composed of a lining plate body 1311 and a heat exchange part 1314. The lining plate body 1311 mainly provides an installation basis for the heat exchange part 1314, which can greatly reduce the processing difficulty of the inner lining plate 131 with the heat exchange part 1314; not only that, under the impact condition, when the impact force borne by the bottom guard plate 132 is transmitted to the inner lining plate 131, the lining plate body 1311 can first deform and absorb a large part of the impact force, and the impact force finally transmitted to the heat exchange part 1314 is greatly weakened, thereby improving the impact protection effect on the heat exchange part 1314.

[0094] In some embodiments, the heat exchange portion 1314 includes a heating film or a heat exchange tube 1314b.

[0095] In the above technical solution, the heating film occupies less space inside the box 1, which helps to improve the energy density of the battery device 100. In addition, the heating accuracy of the heating film is generally high, which has a better thermal management effect on the battery cell 2; please refer to Figure 9 The heat exchange tube 1314b is usually a tubular structure, and a cavity is usually provided inside it for the heat exchange liquid to circulate. Therefore, when the heat exchange tube 1314b encounters an impact, it can absorb energy through its own collapse, and can not only exchange heat with the battery cell 2, but also provide impact protection for the battery cell 2.

[0096] Please continue reading Figure 9 In some embodiments, a receiving recess 1311 a is provided on a side of the liner body 1311 close to the battery cell 2 , and the heat exchange portion 1314 is provided in the receiving recess 1311 a .

[0097] It should be noted that the "accommodation recess 1311a" can be understood as a groove, and can also be similar to the concept of the "raised area 1321" described above. The accommodation recess 1311a can be formed by the area of ​​the liner body 1311 corresponding to the heat exchange portion 1314 being recessed toward the bottom guard plate 132, thereby forming a groove on the side near the battery cell 2 and a protrusion on the side near the bottom guard plate 132. The heat exchange portion 1314 can be only partially disposed within the groove of the accommodation recess 1311a, or it can be completely located within the groove of the accommodation recess 1311a. In either case, it is necessary to ensure that the battery cell 2 can exchange heat with the heat exchange portion 1314 in the accommodation recess 1311a.

[0098] In the above technical solution, a receiving recess 1311a is formed on the liner body 1311 by stamping, and the heat exchange part 1314 is arranged in the receiving recess 1311a. On the one hand, the rigidity and modality of the liner body 1311 can be improved, and on the other hand, it is also beneficial to the positioning and installation of the heat exchange part 1314.

[0099] Please continue reading Figure 9 In some embodiments, the liner body 1311 has a support area 1311 b adjacent to the accommodating recess 1311 a , and an inner surface of the support area 1311 b is flush with the surface of the heat exchange portion 1314 .

[0100] It should be noted that, since the support area 1311b is adjacent to the accommodating recess 1311a, that is, the accommodating recess 1311a is recessed compared to the support area 1311b, the "inner surface of the support area 1311b" refers to the surface of the support area 1311b facing the battery cell 2, and the "inner surface of the support area 1311b is flush with the surface of the heat exchange part 1314" means that the end surface of the heat exchange part 1314 for heat exchange with the battery cell 2 is in the same plane as the inner surface of the support area 1311b, which also means that the inner surface of the support area 1311b can simultaneously participate in abutting the battery cell 2 with the heat exchange part 1314.

[0101] In the above technical solution, the inner surface of the supporting area 1311b of the lining plate body 1311 is set flush with the surface of the heat exchange part 1314, so that the heat exchange part 1314 and the inner surface of the supporting area 1311b can simultaneously participate in abutting the battery cell 2, which is beneficial to improving the supporting stability of the inner lining plate 131 for the battery cell 2, and at the same time can reduce the bearing pressure of the heat exchange part 1314.

[0102] This application also proposes an electrical device, which includes a battery device 100. The battery device 100 is used to provide electrical energy. The specific structure of the battery device 100 is referred to the above embodiments. Since this electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here. Among them, the battery device 100 is used to provide electrical energy to the electrical device, which includes but is not limited to new energy vehicles such as pure electric vehicles, hybrid vehicles, and extended-range vehicles, and may also include aircraft such as electric drones and electric passenger aircraft.

[0103] The present application proposes a battery device 100, which includes a box body 1 and a battery cell 2. The box body 1 has a bottom plate assembly 13, and the bottom plate assembly 13 includes an inner lining plate 131 and a bottom guard plate 132 stacked along its thickness direction X. The inner lining plate 131 is located on the side of the bottom guard plate 132 facing the interior of the box body 1; the battery cell 2 is arranged in the box body 1 and supported by the inner lining plate 131; the inner lining plate 131 is provided with a heat exchange portion 1314 capable of performing heat exchange with the battery cell 2, and there is a space between the inner lining plate 131 and the bottom guard plate 132. Cavity 13a, the cavity 13a includes a first cavity 131a corresponding to the heat exchange portion 1314, and a second cavity 132a staggered from the heat exchange portion 1314. The first cavity 131a is provided with a first buffer portion 31, and the second cavity 132a is provided with a second buffer portion 32. The hardness of the second buffer portion 32 is less than the hardness of the first buffer portion 31. At the position corresponding to the first cavity 131a, the bottom guard plate 132 has a raised area 1321. The first buffer portion 31 is provided between the heat exchange portion 1314 and the raised area 132 of the bottom guard plate 132. 1; the inner lining plate 131 includes a first plate 1312 and a second plate 1313, the first plate 1312 supports the battery cell 2; the second plate 1313 is arranged on the side of the first plate 1312 facing the bottom guard plate 132, the second plate 1313 is corresponding to the second cavity 132a and is attached to the first plate 1312, the second plate 1313 is corresponding to the first cavity 131a and is provided with a protrusion 1313a, the protrusion 1313a and the first plate 1312 together define a heat exchange flow channel 1314a, the heat exchange portion 1 314 includes a heat exchange channel 1314a; or, the heat exchange part 1314 includes a heat exchange tube 1314b, the inner lining plate 131 also includes a lining plate body 1311, and the lining plate body 1311 is provided with a accommodating recess 1311a on the side close to the battery cell 2, and the heat exchange tube 1314b is provided in the accommodating recess 1311a, and the lining plate body 1311 has a supporting area 1311b adjacent to the accommodating recess 1311a, and the inner surface of the supporting area 1311b is flush with the surface of the heat exchange part 1314, and they are jointly in contact with the battery cell 2.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A box body, the box body having a bottom plate assembly, the bottom plate assembly including an inner lining plate and a bottom guard plate stacked along the thickness direction thereof, the inner lining plate being located on a side of the bottom guard plate facing the interior of the box body; and A battery cell is disposed in the box and mounted on the inner lining plate; Among them, the inner lining plate includes a heat exchange part, which is used to exchange heat with the battery cell. There is a cavity between the inner lining plate and the bottom guard plate. The cavity includes a first cavity corresponding to the heat exchange part and a second cavity staggered from the heat exchange part. The first cavity is provided with a first buffer part.

2. The battery device according to claim 1, wherein: The first buffer portion is connected to the bottom guard plate and the inner lining plate at the same time.

3. The battery device according to claim 1, wherein: A second buffer portion is provided in the second cavity; Wherein, the hardness of the second buffer portion is smaller than the hardness of the first buffer portion.

4. The battery device according to claim 1, wherein: At a position corresponding to the first cavity, the bottom guard plate has a raised area raised toward the inner lining plate; The first buffer portion is disposed between the heat exchange portion and the raised area of ​​the bottom guard plate.

5. The battery device according to any one of claims 1 to 4, characterized in that: A heat exchange channel is formed inside the inner lining plate, and the heat exchange portion includes the heat exchange channel.

6. The battery device according to claim 5, wherein: The inner lining plate is provided in a convex manner toward at least one side of the bottom guard plate in an area where the heat exchange flow channel is formed.

7. The battery device according to claim 6, wherein: The inner lining plate comprises: A first plate body, supporting the battery cell; and The second plate body is arranged on the side of the first plate body facing the bottom guard plate, and the second plate body is attached to the first plate body at the second cavity. The second plate body is provided with a protrusion at the first cavity, and the protrusion and the first plate body jointly define the heat exchange channel.

8. The battery device according to any one of claims 1 to 4, characterized in that: The inner lining plate further includes a lining plate body. The heat exchange portion is disposed on a side of the lining plate body facing the battery cell and abuts against the battery cell.

9. The battery device according to claim 8, wherein: The heat exchange part includes a heating film or a heat exchange tube.

10. The battery device according to claim 8, wherein A receiving recess is provided on a side of the liner body close to the battery cell, and the heat exchange portion is provided in the receiving recess.

11. The battery device according to claim 10, wherein: The lining plate body has a support area adjacent to the accommodating recess, and an inner surface of the support area is flush with a surface of the heat exchange portion.

12. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1 to 11.

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