Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device comprises a battery pack, a shell and a sealing cover, the shell is provided with an accommodating cavity and an opening communicated with the accommodating cavity, the battery pack is arranged in the accommodating cavity, and the sealing cover is hermetically connected to the opening; and the accommodating cavity is filled with gas with preset pressure, so that the surface of the battery pack is uniformly pressed. According to the utility model, the accommodating cavity is filled with the gas with the preset pressure, and the cavity is inflated and pressurized, so that an isostatic pressing environment is formed in the accommodating cavity, and all parts of the surface of the battery pack are uniformly pressed. And the problems of poor interface contact and interface resistance increase in the battery caused by volume expansion of the battery in the charge-discharge use process of the battery and in the positive and negative electrode de-embedding process of lithium ions are avoided, so that the charge-discharge performance and the service life of the battery are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of power battery technology, specifically relating to a battery device and an electrical device. Background Technology

[0002] With the continuous development of the new energy vehicle industry, improving the energy density and safety performance of power batteries has become a major research and development direction to meet consumers' requirements for the range and safety of electric vehicles. As the main form of power battery, solid-state batteries use solid inorganic electrolytes, eliminating the need for electrolytes and separators, thus avoiding the risk of spontaneous combustion of electric batteries and improving battery energy density.

[0003] During the charging and discharging process of conventional solid-state batteries, there is a phenomenon where the cell expands when lithium ions are extracted from the cell. This can lead to poor contact at the internal interface of the battery, increased interface resistance, and affect the battery's charging and discharging performance and lifespan. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide a battery device and an electrical device that can solve the problem of excessive cell expansion affecting battery charging and discharging performance in related technologies.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] In a first aspect, the present invention provides a battery device, including a battery pack, a housing, and a sealing cover;

[0007] The housing has a receiving cavity and an opening communicating with the receiving cavity, the battery pack is disposed in the receiving cavity, and the sealing cover is sealed to the opening;

[0008] The cavity is filled with gas at a preset pressure to ensure that the surface of the battery pack is uniformly pressurized.

[0009] Optionally, it also includes a bundle;

[0010] The binding is wrapped around the outside of the housing and the sealing cap, securing the housing and the sealing cap together.

[0011] Optionally, it also includes an air valve;

[0012] One end of the air valve is connected to the accommodating cavity, and the other end of the air valve is adapted to be connected to a booster, and is adapted to fill or discharge gas into the accommodating cavity.

[0013] Optionally, a pressure sensor may also be included;

[0014] The pressure sensor is connected to the accommodating cavity and is suitable for detecting gas pressure.

[0015] Optionally, the binding element includes prestressed steel wire.

[0016] Optionally, the sealing cover has a mounting groove, the sidewall of which forms a sealing plate;

[0017] The sealing plate seals and covers the opening, and the air valve and / or the pressure sensor are installed in the mounting groove.

[0018] Optionally, the sealing plate is provided with a first through hole and a second through hole;

[0019] One end of the air valve extends into the accommodating cavity through the first through hole, and / or the pressure sensor extends into the accommodating cavity at least partially through the second through hole.

[0020] Optionally, the number of sealing caps is two, including a first sealing cap and a second sealing cap, and the housing has two opposing openings;

[0021] The first sealing cap is sealed to one of the openings, and the second sealing cap is sealed to the other opening.

[0022] Optionally, the air valve and the pressure sensor are located in the mounting groove of the first sealing cover.

[0023] Optionally, it also includes power connectors and wiring harnesses;

[0024] The mounting groove of the second sealing cover is filled with insulating adhesive to seal and fix the power connector and wiring harness, which are electrically connected to the battery pack.

[0025] Optionally, the mounting slot has a partition to divide the mounting slot into multiple sub-mounting slots;

[0026] The air valve and the pressure sensor are located in different sub-mounting slots of the first sealing cover; and / or,

[0027] The power connector and the wiring harness are located in different sub-mounting slots of the second sealing cover.

[0028] Optionally, it may also include positioning elements;

[0029] The positioning element is inserted between the housing and the sealing cover.

[0030] Optionally, a sealing ring may also be included;

[0031] The sealing ring is wrapped around the inside of the opening and is sealed between the housing and the sealing cover.

[0032] Optionally, the cross-section of the sealing cover is arc-shaped along the thickness direction of the battery pack.

[0033] Optionally, the sealing cover has a limiting groove on the surface opposite to the housing;

[0034] The binding element is at least partially wrapped around the limiting groove.

[0035] Optionally, the battery pack also includes a tray disposed within the receiving cavity, the battery pack comprising a plurality of individual cells arranged along the thickness direction and disposed within the tray.

[0036] Secondly, this utility model provides an electrical device, including the battery device described in one of the above-mentioned embodiments.

[0037] In the battery device provided by this embodiment, the battery pack is inserted into the accommodating cavity through the opening of the casing. A sealing cap is connected to the opening, forming a sealed cavity that effectively seals and constrains the volume of the battery pack. The accommodating cavity is filled with gas at a preset pressure, pressurizing the cavity. According to Pascal's principle, an isostatic pressure environment is formed inside the accommodating cavity, ensuring uniform pressure across the surface of the battery pack. This avoids the problem of battery volume expansion during the lithium ion insertion / extraction process at the positive and negative electrodes, which can lead to poor internal interface contact and increased interface resistance. Therefore, it ensures the battery's charge / discharge performance and lifespan.

[0038] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0039] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0040] Figure 1 This is a schematic diagram of the battery device structure provided in an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the battery pack structure according to an embodiment of the present invention;

[0042] Figure 3 This is a schematic diagram of the shell structure according to an embodiment of the present utility model;

[0043] Figure 4 This is a schematic diagram of the first sealing cap structure according to an embodiment of the present utility model;

[0044] Figure 5This is a schematic diagram of the second sealing cap structure according to an embodiment of the present utility model;

[0045] Figure 6 This is a schematic diagram of the prestressed steel wire tensioning system according to an embodiment of the present invention;

[0046] Figure 7 This is a schematic diagram of the inflation device according to an embodiment of the present invention;

[0047] Figure 8 This is a schematic diagram of the battery device processing flow according to an embodiment of the present invention.

[0048] Explanation of reference numerals in the attached figures:

[0049] 1-Battery pack, 11-Single cell, 12-Tray, 13-Limiting plate, 2-Housing shell, 21-Accommodation cavity, 22-Opening, 23-Flanged edge, 3-Sealing cover, 301-Top plate, 302-Bottom plate, 3a-First sealing cover, 3b-Second sealing cover, 31-Mounting groove, 32-Sealing plate, 33-Limiting groove, 34-Separator, 321-First through hole, 322-Second through hole, 4-Binding component, 51-Air valve, 52-Pressure sensor, 53-Booster, 6-Positioning component, 81-Power connector, 82-Wire harness, 91-Wire release frame, 92-Tension wheel, 93-Weighted hammer device, 94-Wire laying device, 95-Rotation device. Detailed Implementation

[0050] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0051] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0052] The battery device and power-consuming device provided by the present invention will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0053] Reference Figure 1 and Figure 3 This utility model provides a battery device, including a battery pack 1, a housing 2, and a sealing cover 3; the housing 2 has a receiving cavity 21 and an opening 22 communicating with the receiving cavity 21, the battery pack 1 is disposed in the receiving cavity 21, and the sealing cover 3 is sealed to the opening 22; the receiving cavity 21 is filled with gas at a preset pressure so that the surface of the battery pack 1 is uniformly pressurized.

[0054] Specifically, such as Figure 1 As shown, the battery device provided in this embodiment of the present invention includes a battery pack 1, a housing 2, and a sealing cover 3. Figure 2 As shown, the battery pack 1 includes multiple individual battery cells 11, and the tray 12 is used to hold and place the multiple individual battery cells 11. The housing 2 has an internal cavity 21 with an opening 22. The shape of the housing 2 can be a cuboid, cube, or prism, such as... Figure 3 As shown, the housing 2 used in this embodiment is a cuboid with a rectangular opening to accommodate the external shape of the battery pack 1. The size of the cuboid is slightly larger than the size of the battery pack 1 to effectively constrain the volume expansion of the battery pack 1 during charging and discharging. The battery pack 1 can fit against the inner wall of the housing 2, or there can be a certain gap between the battery pack 1 and the inner wall of the housing 2. At least one end of the housing 2 is provided with an opening 22. The battery pack 1 is inserted into the receiving cavity 21 through the opening 22, and the sealing cover 3 is sealed and connected to the opening 22. The sealing connection method includes, but is not limited to, at least one of the following: using a sealing gasket, sealant, mechanical connection, and externally wrapping prestressed steel wire rope. Therefore, the sealing connection between the housing 2 and the sealing cover 3 ensures the airtightness of the receiving cavity 21, and the volume constraint effect of the housing 2 prevents the battery pack 1 from expanding excessively during charging and discharging. The housing 2 and the sealing cover 3 can be made of materials with a tensile strength greater than or equal to 10 MPa, such as aluminum alloy.

[0055] Specifically, before the battery assembly is packaged, a gas at a preset pressure (10 MPa or slightly less) is introduced into the accommodating cavity 21. The gas is an inert gas or other common gas without moisture, such as carbon dioxide. Pressurizing the accommodating cavity 21 stops when the preset pressure is reached and the pressure is maintained stable. According to Pascal's principle, pressure is transmitted through the air medium, creating an isostatic pressure environment inside the accommodating cavity 21, ensuring uniform pressure throughout the battery pack. This ensures uniform stress on the surface of the battery pack 1 during charging and discharging, avoiding excessive thermal expansion.

[0056] The battery device provided in this embodiment of the utility model has a shell and a sealing cover that serve to seal the cavity and constrain the volume expansion of the battery pack. The cavity is filled with gas at a preset pressure, which makes the battery pack uniformly pressurized. This avoids the problem of battery volume expansion during the lithium ion insertion and extraction process at the positive and negative electrodes during the charging and discharging process, which would cause poor contact at the battery interface and increase the interface resistance. Therefore, it ensures the charging and discharging performance and service life of the battery.

[0057] Optionally, refer to Figure 1 It also includes a binding member 4; the binding member 4 is wrapped around the outside of the housing 2 and the sealing cover 3 to securely connect the housing 2 and the sealing cover 3.

[0058] Specifically, such as Figure 1 As shown, the binding member 4 has a certain tension, also known as prestress. The binding member 4 is wrapped around the outside of the housing 2 and the sealing cover 3, pressing the housing 2 and the sealing cover 3 together. The prestress parameter value of the binding member 4 must be greater than or equal to the gas pressure inside the accommodating cavity 21 to prevent the battery pack 1 from bursting through the housing 2 due to thermal expansion. Therefore, the binding member 4 establishes a certain prestress field by binding and wrapping, applying a certain amount of prestress to the housing 2 and the sealing cover 3, reducing the pressure inside the housing 2 during the charging and discharging of the battery pack 1, and improving the structural strength and sealing performance of the battery device. The binding member 4 can take the form of, but is not limited to, ropes, cable ties, or steel wires. Compared with related technologies that use mechanical connections such as bolts to connect the various structures of the battery device, the fastening method of the binding member 4 in this embodiment is simple and effective, and has better airtightness.

[0059] Optionally, refer to Figure 1 and Figure 4 It also includes a gas valve 51; one end of the gas valve 51 is connected to the accommodating cavity 21, and the other end of the gas valve 51 is adapted to be connected to a booster 53, and is adapted to fill or discharge gas into the accommodating cavity 21.

[0060] Specifically, such as Figure 1 and Figure 4 As shown, the air valve 51 can be fixed to the housing 2 or the sealing cover 3. One end of the air valve 51 extends into the receiving cavity 21 and communicates with the receiving cavity 21 via a threaded connection, such as... Figure 7As shown, the other end of the air valve 51 is used to connect to the booster 53, to fill the accommodating cavity 21 with gas at a preset pressure or to discharge gas from the accommodating cavity 21 when the gas pressure is greater than the preset pressure. For example, when the air valve 51 is open, gas at a pressure of 10 MPa is filled into the accommodating cavity 21. The air valve 51 is a ball-shaped one-way valve, meaning it can only allow gas to enter or exit in one direction, ensuring a certain filling efficiency and sealing performance. It should be noted that in this embodiment, the air valve 51 can be used not only in the stage before the battery device is assembled, but also continuously during the battery charging and discharging process. In conjunction with the detection function of the pressure sensor 52, when the gas pressure in the accommodating cavity 21 fluctuates or does not meet the preset conditions, potentially leading to the risk of excessive battery expansion, the air valve 51 fills or discharges some gas into the accommodating cavity 21, ensuring that the accommodating cavity 21 maintains a static pressure balance. That is, the air valve 51 is used in conjunction with other components of the battery device.

[0061] Optionally, refer to Figure 1 and Figure 4 It also includes a pressure sensor 52; the pressure sensor 52 is connected to the accommodating cavity 21 and is adapted to detect gas pressure.

[0062] Specifically, such as Figure 1 and Figure 4 As shown, the pressure sensor 52 is a highly automated electronic pressure sensor, which can be fixed to the housing 2 or the sealing cover 3. The pressure probe of the pressure sensor 52 extends into the accommodating cavity 21, enabling communication between the pressure sensor 52 and the accommodating cavity 21 to detect the gas pressure inside the accommodating cavity 21. It should be noted that in this embodiment, the pressure sensor 52 can be used not only in the stage before the battery device is assembled to detect whether the charging gas pressure meets the preset pressure, but also continuously during the battery charging and discharging process. When fluctuations in the gas pressure inside the accommodating cavity are detected or the preset pressure is not met, the gas valve 51 is controlled to charge or vent gas into the accommodating cavity 21. That is, the pressure sensor 52 is used in conjunction with other components of the battery device.

[0063] Optionally, refer to Figure 1 The binding element 4 includes prestressed steel wire.

[0064] Specifically, such as Figure 1 As shown, in this embodiment, the binding component 4 uses prestressed steel wire. First, the steel wire is tensioned to a preset stress value using a tensioning system. Then, the prestressed steel wire is wound around the shell 2, the first sealing cover 3a, and the second sealing cover 3b to establish a certain prestress field, resulting in a battery device with strong load-bearing capacity, high fatigue strength, and no explosion hazard caused by prestressed steel wire winding. Figure 6The diagram illustrates a prestressed steel wire tensioning system. The steel wire passes sequentially through a wire feeding frame 91, a tension wheel 92, a counterweight device 93, and a wire laying device 94 to form a steel wire with a certain tension, i.e., a prestressed steel wire. Driven by a rotating device 95, the prestressed steel wire is wound around the outside of the housing 2, the first sealing cover 3a, and the second sealing cover 3b, tightly fitting the housing 2, the first sealing cover 3a, and the second sealing cover 3b together. This improves the airtightness of the accommodating cavity 21, avoids the risk of hydrogen sulfide gas being generated due to contact with moisture in the air during the charging and discharging process of the all-solid-state battery, and ensures the safety of battery use.

[0065] Optionally, refer to Figure 1 and Figure 4 The sealing cover 3 has a mounting groove 31, and the side wall of the mounting groove 31 forms a sealing plate 32; the sealing plate 32 seals and covers the opening 22, and the air valve 51 and the pressure sensor 52 are installed in the mounting groove 31.

[0066] Specifically, such as Figure 1 and Figure 4 As shown, the sealing cover 3 has a mounting groove 31 with an opening at the top for easy disassembly and placement of the air valve 51 and pressure sensor 52. The side wall of the mounting groove 31 facing the housing 2 is a sealing plate 32, which seals and blocks the opening 22. The surface of the sealing plate 32 is the sealing end face. The air valve 51 and pressure sensor 52 are fixed to the surface of the sealing plate 32 facing the mounting groove 31 by threaded connection, and can also be fixed to the bottom surface of the mounting groove 31.

[0067] Optionally, refer to Figure 1 and Figure 4 The sealing plate 32 has a first through hole 321 and a second through hole 322; one end of the air valve 51 extends into the accommodating cavity 21 through the first through hole 321, and / or the pressure sensor 52 extends into the accommodating cavity 21 at least partially through the second through hole 322.

[0068] Specifically, such as Figure 1 and Figure 4 As shown, the sealing plate 32 has a first through hole 321 and a second through hole 322. The air valve 51 and the pressure sensor 52 are fixed to the sealing plate 32 by a threaded connection, that is, the ends of the air valve 51 and the pressure sensor 52 are threaded portions. The threaded portion of the air valve 51 extends into the receiving cavity 21 through the first through hole 321, and / or the threaded portion of the pressure sensor 52 extends into the receiving cavity 21 through the second through hole 322, which facilitates the supply and exhaust of gas into the receiving cavity 21 and the detection of gas pressure. Therefore, both the inflation efficiency and the airtightness of the receiving cavity 21 can be taken into account.

[0069] Optionally, refer to Figure 1 and Figure 3The number of sealing caps 3 is two, including a first sealing cap 3a and a second sealing cap 3b. The housing 2 has two opposing openings 22. The first sealing cap 3a is sealed to one of the openings 22, and the second sealing cap 3b is sealed to the other opening 22.

[0070] Specifically, such as Figure 1 and Figure 3 As shown, this embodiment has two sealing covers 3, namely a first sealing cover 3a and a second sealing cover 3b. Correspondingly, each end of the housing 2 has an opening 22. The first sealing cover 3a is the rear end cover, which is sealed to one of the openings 22, and the second sealing cover 3b is the front end cover, which is sealed to the other opening 22.

[0071] In some embodiments, such as Figure 8 As shown, the battery device is formed using the following steps;

[0072] Step S1: Place multiple individual batteries 11 into the tray 12 in sequence to form a battery pack 1, and place the battery pack 1 into the receiving cavity 21;

[0073] Step S2: Install the air valve 51 and pressure sensor 52 onto the first sealing cover 3b, and install the power connector 81 and wiring harness 82 onto the second sealing cover 3b.

[0074] Step S3: The first sealing cover 3b, the housing 2 and the second sealing cover 3b are tightly connected by prestressed steel wire winding technology.

[0075] Step S4: Inject a preset pressure gas into the accommodating cavity 21 through the gas valve 51.

[0076] Optionally, refer to Figure 4 The air valve 51 and the pressure sensor 52 are located in the mounting groove 31 of the first sealing cover 3a.

[0077] Optionally, refer to Figure 5 It also includes a power connector 81 and a wiring harness 82; the mounting groove 31 of the second sealing cover 3b is filled with insulating glue to seal and fix the power connector 81 and the wiring harness 82, and the wiring harness 82 is electrically connected to the battery pack 1.

[0078] Specifically, such as Figure 4 As shown, the air valve 51 and pressure sensor 52 are fixed in the mounting groove 31 of the first sealing cover 3a by a threaded connection. Figure 5As shown, the power connector 81 and wiring harness 82 are installed in the mounting groove 31 of the second sealing cover 3b in a potting seal. The power connector 81 is used to connect to the electrical load, and the wiring harness 82 is electrically connected to the battery pack 1, conducting current to supply power to the electrical load and transmit electrical signals.

[0079] Optionally, refer to Figure 4 and Figure 5 The mounting groove 31 has a partition 34 that divides the mounting groove 31 into multiple sub-mounting grooves; the air valve 51 and the pressure sensor 52 are located in different sub-mounting grooves of the first sealing cover 3a; and / or, the power connector 81 and the wiring harness 82 are located in different sub-mounting grooves of the second sealing cover 3b.

[0080] Specifically, such as Figure 4 and Figure 5 As shown, both the first sealing cover 3b and the second sealing cover 3b have partitions 34 within their mounting slots 31, dividing the mounting slots 31 into multiple sub-mounting slots. Specifically, the air valve 51 and pressure sensor 52 are located in different sub-mounting slots of the first sealing cover 3a, and / or the power connector 81 and wiring harness 82 are located in different sub-mounting slots of the second sealing cover 3b. These different sub-mounting slots separate and fix the relevant components within them, preventing interference between different components.

[0081] Optionally, refer to Figures 3 to 5 It also includes a positioning element 6; the positioning element 6 is disposed between the housing 2 and the sealing cover 3.

[0082] Specifically, such as Figure 3 and Figure 5 As shown, in this embodiment, the positioning element 6 is a pin, which passes between the flange 23 of the housing 2 and the bottom plate 302 of the sealing cover 3, to pre-position the sealing cover 3 and the housing 2. In this embodiment, the positioning element 6 is provided between the first sealing cover 3a and the housing 2, and between the second sealing cover 3b and the housing 2.

[0083] Optionally, refer to Figure 3 It also includes a sealing ring; the sealing ring is wrapped around the inside of the opening 22 and is sealed between the housing 2 and the sealing cover 3.

[0084] Specifically, such as Figure 3 As shown, sealing rings are wound around the inner sides of the openings 22 at both ends of the housing 2. The sealing rings seal between the housing 2 and the sealing cover 3, further improving the airtightness of the accommodating cavity 21. This avoids the risk of hydrogen sulfide gas being generated due to contact with moisture in the air during the charging and discharging process of the all-solid-state battery, thus improving the safety of the battery. The sealing rings can be made of rubber, plastic and synthetic resin, metal, or fiber-reinforced materials.

[0085] Optionally, refer to Figure 4 and Figure 5 Along the thickness direction of the battery pack 1, the cross-section of the sealing cover 3 is arc-shaped.

[0086] Specifically, such as Figure 4 and Figure 5 As shown, the first sealing cover 3b and the second sealing cover 3b have the same external dimensions and are arc-shaped, including arc-shaped or semi-circular, which can effectively save space and help increase the capacity of the battery device. At the same time, the arc-shaped design ensures that the sealing cover 3 is subjected to more even force during the binding process of the binding member 4, and also prevents the sharp edges of the sealing cover 3 from scratching the binding member 4.

[0087] Optionally, refer to Figure 4 and Figure 5 The sealing cover 3 has a limiting groove 33 on its surface away from the housing 2; the binding member 4 is at least partially wrapped around the limiting groove 33.

[0088] Specifically, both the outer surfaces of the first sealing cover 3b and the second sealing cover 3b are provided with limiting grooves 33. For example... Figure 4 As shown, taking the first sealing cover 3b as an example, the space between its top plate 301 and bottom plate 302 forms a limiting groove 33. The prestressed steel wire of the binding member 4 is wrapped in the limiting groove 33. The limiting groove 33 can fix the limiting steel wire and prevent dislocation failure.

[0089] Optionally, refer to Figure 1 and Figure 2 It also includes a tray 12, which is disposed in the receiving cavity 21. The battery pack 1 includes a plurality of individual cells 11, which are arranged along the thickness direction and disposed in the tray 12.

[0090] Specifically, such as Figure 1 and Figure 2 As shown, tray 12 is used to support individual battery cells 11. Multiple individual battery cells 11 are arranged along the thickness direction and placed inside tray 12. The individual battery cells 11 and tray 12 are placed together inside receiving cavity 21. Figure 2 As shown, a limiting plate 13 is also provided inside the tray 12. The limiting plate 13 can separate the installation space of multiple individual batteries 11 and limit and fix the individual batteries 11 along the thickness direction of the individual batteries 11 to prevent them from being damaged due to displacement and shaking.

[0091] Optionally, in another embodiment not shown, a limiting plate 13 is provided inside the housing 2. The limiting plate 13 is connected to the inner wall of the accommodating cavity 21. There are at least two limiting plates 13. Multiple individual batteries 11 are provided in the limiting space between the at least two limiting plates 13. The limiting plates 13 can separate the installation space of multiple individual batteries and limit and fix the individual batteries 11 along the thickness direction of the individual batteries 11 to prevent them from being damaged due to displacement and shaking.

[0092] This utility model embodiment also provides an electrical device, including the battery device described in any of the above embodiments, wherein the electrical device is an electric vehicle, an aircraft, a computer, a ferry, or a battery swapping station, etc.

[0093] When the electrical device is an electric vehicle, the safe driving performance of the electric vehicle can be improved by enhancing the charging and discharging performance and lifespan of the battery device.

[0094] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0095] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A battery device, characterized in that, Includes a battery pack (1), a housing (2), and a sealing cap (3); The housing (2) has a receiving cavity (21) and an opening (22) communicating with the receiving cavity (21). The battery pack (1) is disposed in the receiving cavity (21), and the sealing cover (3) is sealed to the opening (22). The cavity (21) is filled with gas at a preset pressure so that the surface of the battery pack (1) is uniformly pressurized.

2. The battery device according to claim 1, characterized in that, It also includes the binding (4); The binding member (4) is wrapped around the outside of the housing (2) and the sealing cover (3) to securely connect the housing (2) and the sealing cover (3).

3. The battery device according to claim 1, characterized in that, It also includes an air valve (51); One end of the air valve (51) is connected to the accommodating cavity (21), and the other end of the air valve (51) is adapted to be connected to the booster (53) and adapted to fill or discharge gas into the accommodating cavity (21).

4. The battery device according to claim 3, characterized in that, It also includes a pressure sensor (52); The pressure sensor (52) is connected to the accommodating cavity (21) and is suitable for detecting gas pressure.

5. The battery device according to claim 2, characterized in that, The binding element (4) includes prestressed steel wire.

6. The battery device according to claim 4, characterized in that, The sealing cover (3) has a mounting groove (31), and the sidewall of the mounting groove (31) forms a sealing plate (32); The sealing plate (32) seals and blocks the opening (22), and the air valve (51) and / or the pressure sensor (52) are installed in the mounting groove (31).

7. The battery device according to claim 6, characterized in that, The sealing plate (32) is provided with a first through hole (321) and a second through hole (322); One end of the air valve (51) extends into the accommodating cavity (21) through the first through hole (321), and / or the pressure sensor (52) extends into the accommodating cavity (21) at least partially through the second through hole (322).

8. The battery device according to claim 6, characterized in that, The number of the sealing caps (3) is two, including a first sealing cap (3a) and a second sealing cap (3b), and the housing (2) has two opposing openings (22); The first sealing cap (3a) is sealed to one of the openings (22), and the second sealing cap (3b) is sealed to the other opening (22).

9. The battery device according to claim 8, characterized in that, The air valve (51) and the pressure sensor (52) are located in the mounting groove (31) of the first sealing cover (3a).

10. The battery device according to claim 9, characterized in that, It also includes a power connector (81) and a wiring harness (82); The mounting groove (31) of the second sealing cover (3b) is filled with insulating glue to seal and fix the power connector (81) and the wiring harness (82), which is electrically connected to the battery pack (1).

11. The battery device according to claim 10, characterized in that, The mounting slot (31) has a partition (34) that divides the mounting slot (31) into multiple sub-mounting slots; The air valve (51) and the pressure sensor (52) are located in different sub-mounting slots of the first sealing cover (3a); and / or, The power connector (81) and the wiring harness (82) are located in different sub-mounting slots of the second sealing cover (3b).

12. The battery device according to any one of claims 1 to 11, characterized in that, It also includes positioning components (6); The positioning element (6) is inserted between the housing (2) and the sealing cover (3).

13. The battery device according to any one of claims 1 to 11, characterized in that, It also includes sealing rings; The sealing ring is wrapped around the inside of the opening (22) and is sealed between the housing (2) and the sealing cover (3).

14. The battery device according to claim 2 or 5, characterized in that, Along the thickness direction of the battery pack (1), the cross-section of the sealing cover (3) is arc-shaped.

15. The battery device according to claim 2 or 5, characterized in that, The sealing cover (3) has a limiting groove (33) on the surface opposite to the housing (2); The binding member (4) is at least partially wrapped around the limiting groove (33).

16. The battery device according to any one of claims 1 to 11, characterized in that, It also includes a tray (12) disposed in the accommodating cavity (21). The battery pack (1) includes a plurality of individual cells (11), which are arranged along the thickness direction and disposed in the tray (12).

17. An electrical device, characterized in that, Includes the battery device according to any one of claims 1 to 16.

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