Battery device and power-using device

Abstract

The present application discloses a battery device and an electrical device, belonging to the field of battery technology. The pressure relief port of the battery cell is located on one side of the shell along the first direction, the first box body and the second box body are arranged along the second direction intersecting the first direction, the shell along the first direction toward the pressure relief port is correspondingly provided with a first sealing surface and a second sealing surface and a protective device located between the pressure relief port and the corresponding first sealing surface, the protective device is arranged across the first sealing surface and the second sealing surface along the second direction, the minimum thickness of the protective device along the first direction is a preset thickness, the minimum distance between the pressure relief port and the surface of the protective device along the first direction away from the pressure relief port is a preset distance, the product of the square of the preset distance and the preset thickness is the target parameter, and the ratio of the square of the preset melting point of the protective device to the target parameter is less than or equal to the first preset ratio. The battery device and the electrical device of the embodiment of the present application enable a good seal between the first sealing surface and the second sealing surface.

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] Batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, batteries are also being increasingly used in areas such as energy storage.

[0003] In the related art, during the thermal runaway of a battery cell of a battery device, the sealing of the box may fail due to the effect of the thermal runaway emissions. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery device and an electrical device to reduce the possibility of box sealing failure.

[0005] This application is implemented through the following technical solutions.

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

[0007] A battery cell assembly, comprising at least one battery cell, wherein the battery cell comprises a housing and an electrode assembly located in the housing, wherein the housing has a pressure relief port, and the pressure relief port is located on one side of the housing along a first direction;

[0008] A box body, having a receiving cavity, wherein the battery cell is located in the receiving cavity, wherein the box body comprises a first box body and a second box body connected to each other, wherein the first box body and the second box body are arranged along a second direction, wherein the second direction is arranged crosswise with the first direction, wherein the first box body has a first sealing surface on a side facing the second box body, and the second box body has a second sealing surface on a side facing the first box body, wherein the first sealing surface and the second sealing surface are at least partially sealed, and wherein the first sealing surface and the second sealing surface are correspondingly arranged on a side of the housing along the first direction facing the pressure relief port;

[0009] A protective device, wherein the protective device is disposed between the pressure relief port and the corresponding first sealing surface along the first direction, and the protective device is disposed across the first sealing surface and the second sealing surface along the second direction;

[0010] The minimum thickness of the protective device along the first direction is a preset thickness, the minimum distance between the pressure relief port and the surface of the protective device along the first direction facing away from the pressure relief port is a preset distance, the product of the square of the preset distance and the preset thickness is a target parameter, the melting point of the protective device is a preset melting point, the ratio of the square of the preset melting point to the target parameter is a target ratio, and the target ratio is less than or equal to a first preset ratio to maintain a seal between the first sealing surface and the second sealing surface.

[0011] In the embodiment of the present application, by controlling the relationship between the thickness of the protective device, the melting point of the protective device and the distance from the pressure relief port to the protective device, the possibility of sealing failure between the first sealing surface and the second sealing surface is reduced, and thermal runaway emissions are suppressed from leaking between the first sealing surface and the second sealing surface.

[0012] In one embodiment, when the melting point of the protective device is greater than 700° C. and the melting point of the protective device is less than or equal to 1000° C., the first preset ratio is 3.4, and the units of the preset thickness and the preset distance are both millimeters.

[0013] In the embodiments of the present application, the relationship between the thickness of the protective device, the melting point of the protective device and the distance from the pressure relief port to the protective device is controlled to reduce the possibility of sealing failure between the first sealing surface and the second sealing surface, thereby suppressing the leakage of thermal runaway emissions from between the first sealing surface and the second sealing surface.

[0014] In one embodiment, when the melting point of the protective device is greater than 1000° C. and the melting point of the protective device is less than or equal to 1400° C., the first preset ratio is 32, and the units of the preset thickness and the preset distance are both millimeters.

[0015] In the embodiment of the present application, the possibility of sealing failure between the first sealing surface and the second sealing surface is reduced, and leakage of thermal runaway emissions from between the first sealing surface and the second sealing surface is suppressed.

[0016] In one embodiment, when the melting point of the protective device is greater than 1400° C. and the melting point of the protective device is less than or equal to 2000° C., the first preset ratio is 104, and the units of the preset thickness and the preset distance are both millimeters.

[0017] In the embodiment of the present application, the possibility of sealing failure between the first sealing surface and the second sealing surface is reduced, and leakage of thermal runaway emissions from between the first sealing surface and the second sealing surface is suppressed.

[0018] In one embodiment, the target ratio is less than or equal to a second preset ratio to suppress the protective device from being melted through, and the second preset ratio is less than the first preset ratio.

[0019] In the embodiment of the present application, the protective device is not melted through, and the protective device can continue to protect the first sealing surface and the second sealing surface, thereby improving the safety of the box.

[0020] In one embodiment, when the melting point of the protective device is greater than 700° C. and the melting point of the protective device is less than or equal to 1000° C., the second preset ratio is 2.5, and the units of the preset thickness and the preset distance are both millimeters.

[0021] In the embodiment of the present application, the possibility of the protective device being melted through by thermal runaway emissions is reduced, and the protective device protects the first sealing surface and the second sealing surface to reduce the possibility of sealing failure.

[0022] In one embodiment, when the melting point of the protective device is greater than 1000° C. and the melting point of the protective device is less than or equal to 1400° C., the second preset ratio is 22.5, and the units of the preset thickness and the preset distance are both millimeters.

[0023] In the embodiment of the present application, the possibility of the protective device being melted through by thermal runaway emissions is reduced, and the protective device protects the first sealing surface and the second sealing surface to reduce the possibility of sealing failure.

[0024] In one embodiment, when the melting point of the protective device is greater than 1400° C. and the melting point of the protective device is less than or equal to 2000° C., the second preset ratio is 78, and the units of the preset thickness and the preset distance are both millimeters.

[0025] In the embodiment of the present application, the possibility of the protective device being melted through by thermal runaway emissions is reduced, and the protective device protects the first sealing surface and the second sealing surface to reduce the possibility of sealing failure.

[0026] In one embodiment, the overlapping projections of the first sealing surface and the second sealing surface along the first direction and the projection of the pressure relief port along the first direction are target projections, and the target projections are located within the projection area of ​​the protective device along the first direction.

[0027] In the embodiment of the present application, the protection device protects the first sealing surface and the second sealing surface corresponding to the target projection area, which can effectively reduce the possibility of damage to the sealing structure of the first sealing surface and the second sealing surface.

[0028] In one embodiment, the number of the battery cells in each of the battery cell assemblies is at least two, at least two of the battery cells are arranged along a third direction, the third direction is arranged crosswise with the first direction and the second direction respectively, the pressure relief directions of all the pressure relief ports in the same battery cell assembly are the same, the number of the protective devices is at least two, the pressure relief port of each of the battery cells is correspondingly provided with the protective device, and at least two of the protective devices are arranged at intervals along the third direction.

[0029] In the embodiment of the present application, a protective device is provided at a position corresponding to the pressure relief port, and a protective device may not be provided at a position without a pressure relief port, which does not affect the protective effect on the first sealing surface and the second sealing surface and can reduce the number and volume of the protective devices.

[0030] In one embodiment, the number of the battery cells in each of the battery cell assemblies is at least two, at least two of the battery cells are arranged along a third direction, the third direction is cross-arranged with the first direction and the second direction respectively, the pressure relief direction of all the pressure relief ports in the same battery cell assembly is the same, and a protective device is correspondingly arranged between each of the battery cell assemblies and the first sealing surface along the first direction, and the protective device extends along the third direction from one end of the battery cell assembly to the other end of the battery cell assembly.

[0031] In the embodiments of the present application, the situation where the protection failure is caused by the installation error of the protection device is reduced, the protection effect of the protection device on the first sealing surface and the second sealing surface is good, the installation of the protection device is not limited by the battery cell, and the protection device is easy to install.

[0032] In one embodiment, the protective device is glued to the box body.

[0033] In the embodiment of the present application, the protective device is glued to the box body to facilitate installation of the protective device.

[0034] In one embodiment, the melting point of the protective device is greater than 700°C.

[0035] In the embodiment of the present application, the protective device has good high temperature resistance, so that the protective device can have a smaller thickness to meet the protective effect.

[0036] In one embodiment, the material of the protective device is any one of mica, ceramic, ceramic composite material, metal, metal alloy, carbon fiber, and carbon fiber composite material.

[0037] In the embodiments of the present application, there are many types of materials to choose from for the protective device, and a suitable material can be selected according to actual needs.

[0038] In one embodiment, the protection device is arranged across the inner surfaces of the side walls of the first box and the second box along the second direction.

[0039] In the embodiment of the present application, the size of the protective device along the second direction is large enough to improve the protective effect of the protective device.

[0040] In one embodiment, the battery device further comprises a mounting plate connected to the protective device, wherein the mounting plate is clamped between the first box body and the second box body.

[0041] In the embodiment of the present application, the protection device is restricted from moving along the second direction, thereby improving the installation stability of the protection device.

[0042] In one embodiment, the protective device protrudes from opposite sides of the mounting plate along the second direction.

[0043] In the embodiment of the present application, the protective device can cover the first sealing surface and the second sealing surface as much as possible along the second direction to improve the protective effect.

[0044] In one embodiment, the number of the battery cell assemblies is two, and the pressure relief port of the battery cell in each of the battery cell assemblies is located on a side of the corresponding housing that is away from the corresponding other battery cell assembly.

[0045] In the embodiments of the present application, the situation where thermal runaway emissions are ejected to battery cells of other battery cell assemblies is reduced, the mutual influence of thermal runaway between battery cell assemblies is reduced, and the safety of the battery cell assemblies is improved.

[0046] In one embodiment, one end of the protective device along the second direction facing the first sealing surface is integrally formed with the first box body, and one end of the protective device along the second direction facing the second sealing surface protrudes from the first sealing surface.

[0047] In the embodiment of the present application, the protruding portion of the protective device can cover the first sealing surface and the second sealing surface without affecting the protective effect of the protective device. The protective device integrally formed with the first box body does not need to be installed, thereby improving the production efficiency of the battery device.

[0048] In one embodiment, the protective device is a first protrusion, and the first box body is also formed with a second protrusion, the second protrusion protrudes from the first sealing surface along the side of the first sealing surface toward the second sealing surface, and the first sealing surface and the second sealing surface are both located between the first protrusion and the second protrusion along the first direction.

[0049] In the embodiment of the present application, the first protrusion and the second protrusion are arranged to have a structure with multiple bends. The resistance to the flow of fluid in the structure with multiple bends is relatively large, thereby improving the sealing effect of the first sealing surface and the second sealing surface.

[0050] In one embodiment, the battery device further includes a sealing medium layer located between the first protrusion and the second protrusion, and the sealing medium layer is in contact and sealed with the first sealing surface and the second sealing surface respectively.

[0051] In the embodiment of the present application, the sealing medium layer can improve the sealing effect between the first sealing surface and the second sealing surface.

[0052] In one embodiment, the battery device further includes a connector, which is respectively connected to the first box body and the second box body so that the first box body is installed on the second box body, and the connector is located on a side of the second protrusion away from the first protrusion.

[0053] In the embodiment of the present application, the connecting member enables the first box body and the second box body to be firmly installed and the connecting member does not affect the sealing of the first sealing surface and the second sealing surface.

[0054] In one embodiment, the battery cell further includes a pressure relief mechanism covering the pressure relief port, and the pressure relief mechanism is mounted on the housing.

[0055] In the embodiment of the present application, the pressure relief mechanism can reduce the possibility of thermal runaway emissions from adjacent battery cells entering the interior of the battery cells through the pressure relief port, which is beneficial to suppress the spread of thermal runaway to a certain extent.

[0056] A second aspect of an embodiment of the present application provides an electrical device, including:

[0057] Device body;

[0058] The battery device described above is installed in the device body to supply power to the device body.

[0059] In the embodiment of the present application, by controlling the relationship between the thickness of the protective device, the melting point of the protective device and the distance from the pressure relief port to the protective device, the possibility of sealing failure between the first sealing surface and the second sealing surface is reduced, and thermal runaway emissions are suppressed from leaking between the first sealing surface and the second sealing surface.

[0060] The embodiment of the present application provides a battery device and an electric device, wherein the pressure relief port of the battery cell is arranged toward the first sealing surface and the second sealing surface, the protective device is arranged between the pressure relief port and the first sealing surface, and the protective device is arranged across the first sealing surface and the second sealing surface along the second direction, so that the protective device shields the first sealing surface and the second sealing surface, and the high-temperature and high-speed emissions discharged from the pressure relief port directly contact the protective device, preventing the emissions of the battery cell from thermal runaway from directly contacting the first sealing surface and the second sealing surface, and reducing the damage to the first sealing surface and the second sealing surface caused by the thermal runaway of the battery cell. The target ratio is controlled to be less than or equal to the first preset ratio, and the relationship between the thickness of the protective device, the melting point of the protective device and the distance from the pressure relief port to the protective device is controlled, so as to reduce the possibility of sealing failure of the first sealing surface and the second sealing surface caused by the thermal runaway emissions of the battery cell, and inhibit the thermal runaway emissions of the battery cell from leaking between the first sealing surface and the second sealing surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0062] Figure 1 This is an exploded view of a battery device according to an embodiment of the present application, showing at least two protective devices arranged at intervals;

[0063] Figure 2 An exploded view of a battery device according to an embodiment of the present application;

[0064] Figure 3 This is an exploded view of a battery device according to an embodiment of the present application, in which a mounting plate is shown;

[0065] Figure 4 This is a schematic diagram of the structure of a battery device according to an embodiment of the present application, in which a protective device is shown;

[0066] Figure 5 for Figure 4 Sectional view at AA;

[0067] Figure 6 is a cross-sectional view of a battery device according to an embodiment of the present application, showing a mounting plate;

[0068] Figure 7 for Figure 6 Enlarged view at B in the middle;

[0069] Figure 8 This is a schematic diagram of the structure of the battery device according to an embodiment of the present application, in which the protective device and the first box body are integrally formed;

[0070] Fig. 9 for Figure 8 Enlarged view at center C.

[0071] Description of Reference Numerals

[0072] 1. Box body; 11. First box body; 111. First sealing surface; 12. Second box body; 121. Second sealing surface; 13. Accommodating cavity; 2. Battery cell assembly; 21. Battery cell; 211. Pressure relief port; 212. Shell; 3. Protective device; 31. First protrusion; 32. Second protrusion; 4. Mounting plate; 5. Sealing medium layer; 6. Connector; 7. Pressure relief mechanism. DETAILED DESCRIPTION

[0073] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the embodiments of this application and any variations thereof are intended to cover non-exclusive inclusions.

[0075] In the description of the embodiments of the present application, the technical terms "first", "second", "third", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0076] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0077] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0078] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0079] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and may be direct contact or contact through an intermediate medium layer. It may be contact with essentially no interaction force between the two contacting parties, or it may be contact with interaction force between the two contacting parties.

[0080] In the related art, the box of the battery device includes a first box and a second box, the first box and the second box are arranged to form a receiving cavity, and the battery cell is arranged in the receiving cavity. The first box and the second box are sealed and connected so that the battery cell is in a relatively sealed receiving space. When the battery cell has thermal runaway, the high-temperature and high-speed discharge from the pressure relief port of the battery cell impacts the sealed connection between the first box and the second box, which is easy to damage the sealing structure, resulting in failure of the sealed connection between the first box and the second box.

[0081] In the embodiment of the present application, by limiting the relationship between the thickness of the protective device 3, the distance between the pressure relief port 211 and the protective device 3, and the melting point of the protective device 3 being a preset melting point, the possibility of thermal runaway emissions of the battery cell 21 causing the sealing failure of the first sealing surface 111 and the second sealing surface 121 is reduced, and the sealing between the first sealing surface 111 and the second sealing surface 121 is maintained.

[0082] The battery device provided in the embodiment of the present application can be used in, but is not limited to, energy storage power supply systems, vehicles, ships, aircraft and other electrical devices.

[0083] The embodiment of the present application provides an electric device including the above-mentioned battery device for providing electric energy, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0084] The power-consuming device of the embodiment of the present application includes a device body and a battery device, and the battery device is installed in the device body to supply power to the device body.

[0085] The device body refers to the main structure that consumes electrical energy to achieve the corresponding function.

[0086] Exemplarily, the power-consuming device may be a mobile phone, the device body is a part capable of realizing functions such as communication, and power is supplied to the part capable of realizing functions such as communication through a battery device.

[0087] Exemplarily, the power-consuming device may be a vehicle, wherein the main body of the device is a part for passengers to sit on and capable of traveling on the road, and the battery device is used to supply power to the part for passengers to sit on and capable of traveling on the road.

[0088] In the embodiment of the present application, power is supplied to the device body by the battery device, so that the device body obtains the electrical energy required to maintain normal operation.

[0089] The electrical device in the embodiment of the present application is taken as an example of a vehicle.

[0090] The vehicle provided in the embodiments of the present application may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device is provided inside the vehicle, and the battery device may be provided at the bottom, head or tail of the vehicle. The battery device may be used to power the vehicle, for example, the battery device may be used as an operating power source for the vehicle. The vehicle may also include a controller and a motor, and the controller may be used to control the battery device to power the motor. For example, the battery device may be used for starting, navigating and operating power requirements of the vehicle during driving.

[0091] In some embodiments of the present application, the battery device can be used not only as an operating power source for the vehicle, but also as a driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0092] The number of battery cells 21 may be at least two, and at least two battery cells 21 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 21 are both connected in series and in parallel. At least two battery cells 21 may be connected in series, in parallel, or in a hybrid connection to form a battery cell assembly 2, and at least two battery cell assemblies 2 may be connected in series, in parallel, or in a hybrid connection to form a battery device. The battery device may also include other structures, for example, the battery device may also include a busbar component for realizing electrical connection between at least two battery cells 21.

[0093] The battery cell 21 refers to a basic unit that can realize mutual conversion between chemical energy and electrical energy.

[0094] In the embodiment of the present application, the battery cell 21 may be a secondary battery. A secondary battery refers to a battery cell 21 that can be continuously used by activating active materials by charging after the battery cell 21 is discharged.

[0095] In the embodiment of the present application, the battery cell 21 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., but the embodiment of the present application is not limited to this.

[0096] Exemplarily, the battery cell 21 is a secondary battery, which refers to a battery cell 21 that can be continuously used by activating active materials by charging after the battery cell 21 is discharged.

[0097] Exemplarily, the box body 1 can be used as a part of the chassis structure of the vehicle. For example, part of the box body 1 can become at least a part of the floor of the vehicle, or part of the box body 1 can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0098] The battery cell 21 generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is arranged between the negative electrode and the positive electrode. During the charging or discharging process of the battery cell 21, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0099] The separator may be a separator film.

[0100] The electrode assembly may be a wound structure, a laminated structure, or a mixed structure of a wound structure and a laminated structure.

[0101] The outer shell 212 of the battery cell 21 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. Exemplarily, the outer shell 212 can be a sealed structure or a non-sealed structure. Exemplarily, when the outer shell 212 is a non-sealed structure, the outer shell 212 plays a role in protecting the electrode assembly, and a sealing bag is also included between the outer shell 212 and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the outer shell 212 is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0102] At least one electrode terminal is disposed on the housing 212, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal can be directly connected to the electrode tab, or indirectly connected to the electrode tab through a current collecting member. The electrode terminal can be disposed on the end cap, or on the housing.

[0103] Exemplarily, the battery cell 21 may be a cylindrical battery cell 21 , a prismatic battery cell 21 , a soft-pack battery cell 21 , or a battery cell 21 of other shapes.

[0104] The battery device provided in the embodiment of the present application is shown in FIG. Figure 1 to Figure 9The battery device includes a battery cell assembly 2, a box body 1 and a protective device 3. The battery cell assembly 2 includes at least one battery cell 21. The battery cell 21 includes a shell 212 and an electrode assembly located in the shell 212. The shell 212 has a pressure relief port 211. The pressure relief port 211 is located on one side of the shell 212 along a first direction. The box body 1 has a receiving cavity 13. The battery cell 21 is located in the receiving cavity 13. The box body 1 includes a first box body 11 and a second box body 12 connected to each other. The first box body 11 and the second box body 12 are arranged along a second direction. The second direction is arranged crosswise with the first direction. The first box body 11 has a first sealing surface 111 on a side facing the second box body 12. The second box body 12 has a second sealing surface 121 on a side facing the first box body 11. The first sealing surface 111 and the second sealing surface 121 are at least partially sealed. The shell 212 is sealed with a first sealing surface 111 and a second sealing surface 121 correspondingly on one side of the shell 212 facing the pressure relief port 211 along the first direction, a protective device 3 is arranged between the pressure relief port 211 and the corresponding first sealing surface 111 along the first direction, the protective device 3 is arranged across the first sealing surface 111 and the second sealing surface 121 along the second direction, the minimum thickness of the protective device 3 along the first direction is a preset thickness, the minimum distance between the pressure relief port 211 and the surface of the protective device 3 along the first direction away from the pressure relief port 211 is a preset distance, the product of the square of the preset distance and the preset thickness is a target parameter, the melting point of the protective device 3 is a preset melting point, the ratio of the square of the preset melting point to the target parameter is a target ratio, and the target ratio is less than or equal to the first preset ratio so as to maintain sealing between the first sealing surface 111 and the second sealing surface 121.

[0105] The protection device 3 is a structure made of fireproof material with a certain thickness.

[0106] Exemplarily, the protection device 3 is a plate-like structure with uniform thickness.

[0107] The accommodating cavity 13 of the box body 1 is used to accommodate the battery cell assembly 2 .

[0108] Exemplarily, the second box body 12 is a top cover, the first box body 11 is a main box, and the top cover and the main box are buckled together so that the box body 1 forms a closed accommodating cavity 13.

[0109] Exemplarily, the first box body 11 includes a bottom plate and a frame, and the second box body 12 , the frame and the bottom plate form a receiving cavity 13 .

[0110] When thermal runaway occurs in the battery cell 21, the high-temperature and high-pressure substances inside the battery cell 21 will be discharged from the pressure relief port 211 as emissions. In this way, the pressure and temperature of the battery cell 21 can be relieved under controllable pressure or temperature, thereby avoiding potential more serious accidents. Emissions discharged from the pressure relief port 211 include electrolytes, dissolved or split positive and negative electrodes, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0111] The shell 212 has a cavity formed inside. The battery cell 21 includes a battery cell. The cavity of the shell 212 is used to accommodate the battery cell. The shell 212 is mainly depressurized through the pressure relief port 211. The shell 212 guides the emission generated by thermal runaway of the battery cell to be discharged from the pressure relief port 211.

[0112] Exemplarily, the battery cell is a soft-pack battery cell.

[0113] The number of battery cell assemblies 2 is not limited, and the number of battery cell assemblies 2 can be one, two or three.

[0114] The battery cell assembly 2 is located in the box body 1 . The box body 1 and the battery cell assembly 2 in the box body 1 supply power to the outside as a whole. The box body 1 can better protect the battery cell assembly 2 in the box body 1 .

[0115] For example, the battery cell assembly 2 may also be accommodated in the box body 1 by directly fixing the plurality of battery cells 21 to the box body 1 .

[0116] Exemplarily, the battery cell assembly 2 may be a battery module, which is formed by arranging and fixing at least two battery cells 21 to form an independent module. The battery cell assembly 2 may be accommodated in the box body 1 by fixing the battery module in the box body 1. Exemplarily, the battery module may be formed by bundling at least two battery cells 21 with a cable tie.

[0117] It should be noted that the protective device 3 is arranged across the first sealing surface 111 and the second sealing surface 121 along the second direction, which means that the projection of the protective device 3 along the first direction is the first projection, the projection of the first sealing surface 111 along the first direction is the second projection, the projection of the second sealing surface 121 along the first direction is the third projection, and the first projection is arranged across the second projection and the third projection along the second direction.

[0118] It should be noted that at least partially sealing between the first sealing surface 111 and the second sealing surface 121 means that the first sealing surface 111 and the second sealing surface 121 may be partially unsealed on the side facing away from the accommodating cavity 13. The first sealing surface 111 and the second sealing surface 121 are sealed around the accommodating cavity 13 in one circle.

[0119] The preset distance can be measured by a vernier caliper or a ruler in a non-operating state with the battery cell 21 powered off at a normal temperature and pressure. The preset distance is shown as D1 in the figure.

[0120] The preset thickness can be measured by a vernier caliper or a ruler in a non-operating state with the battery cell 21 powered off at a normal temperature and pressure. The preset thickness is shown as D2 in the figure.

[0121] The melting point of the protective device 3 refers to the temperature at which the protective device 3 melts from a solid state to a liquid state. The preset melting point of the protective device 3 is represented by T.

[0122] The melting point of the protective device is obtained experimentally.

[0123] It is understandable that the smaller the preset distance is, the closer the distance between the pressure relief port 211 and the protective device 3 is, and the more easily the protective device 3 is melted through by the high-temperature and high-speed discharge discharged from the pressure relief port 211. The lower the melting point of the protective device 3 is, the more easily the protective device 3 is melted through. The thinner the thickness of the protective device 3 is, the more easily the protective device 3 is melted through.

[0124] In the embodiment of the present application, the pressure relief port 211 of the battery cell 21 is arranged toward the first sealing surface 111 and the second sealing surface 121, and the protective device 3 is arranged between the pressure relief port 211 and the first sealing surface 111. The protective device 3 is arranged across the first sealing surface 111 and the second sealing surface 121 along the second direction, so that the protective device 3 blocks the first sealing surface 111 and the second sealing surface 121, and the high-temperature and high-speed emissions discharged from the pressure relief port 211 directly contact the protective device 3, preventing the emissions of the battery cell 21 from thermal runaway from directly contacting the first sealing surface 111 and the second sealing surface 121, thereby reducing the damage to the first sealing surface 111 and the second sealing surface 121 caused by thermal runaway of the battery cell 21. The target ratio is controlled to be less than or equal to the first preset ratio, and the relationship between the thickness of the protective device 3, the melting point of the protective device 3 and the distance from the pressure relief port 211 to the protective device 3 is controlled to reduce the possibility of sealing failure caused by thermal runaway emissions of the battery cell 21 on the first sealing surface 111 and the second sealing surface 121, and inhibit the thermal runaway emissions of the battery cell 21 from leaking from between the first sealing surface 111 and the second sealing surface 121.

[0125] For the convenience of explanation, as shown in the figure, the direction indicated by the arrow R1 is the first direction, the direction indicated by the arrow R2 is the second direction, and the direction indicated by the arrow R3 is the third direction.

[0126] In one embodiment, when the melting point of the protective device 3 is greater than 700° C. and the melting point of the protective device 3 is less than or equal to 1000° C., the first preset ratio is 3.4, and the units of the preset thickness and the preset distance are both millimeters.

[0127] Illustratively, the target ratio is 3.4, 3.0, 2.5, 1.8 or 1.

[0128] Test method: Take a battery cell 21 with a size of 31mm*238mm*117mm, put a 30mm*30mm, 300W heating device inside the battery cell 21 to trigger thermal runaway, take a 3mm thick sheet metal box 1, a 0.7mm thick carbon fiber first box 11 and a first box 11 to form a test device, the first sealing surface 111 and the second sealing surface 121 are locked by bolts, and the bolt spacing is 50mm. Before the test, place the battery cell 21 in the box 1, the pressure relief port 211 of the battery cell 21 faces the first sealing surface 111 and the second sealing surface 121 of the box 1, the projection of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction at least partially overlap, and the protective device 3 completely covers the first sealing surface 111 and the second sealing surface 121. The battery cell 21 is caused to thermally run away by a 40V, 10A electrically triggered heating device. After the thermal runaway of the battery cell 21 is over, observe whether the protective device 3 is melted through, and observe whether the first sealing surface 111 and the second sealing surface 121 are invalid. During the test, the distance from the pressure relief port 211 of the battery cell 21 along the first direction to the side of the protective device 3 away from the pressure relief port 211 along the first direction is changed, the thickness of the protective device 3 is changed, and materials of the protective device 3 with different melting points are used to obtain different test data.

[0129] To observe whether the seal between the first sealing surface 111 and the second sealing surface 121 fails, smoke can be injected into the space between the first sealing surface 111 and the second sealing surface 121. If the smoke can pass through the space between the first sealing surface 111 and the second sealing surface 121, it indicates that the seal has failed; if the smoke cannot pass through the space between the first sealing surface 111 and the second sealing surface 121, it indicates that the seal has not failed. You can also put some water on the first sealing surface 111 and the second sealing surface 121, and ventilate the space between the first sealing surface 111 and the second sealing surface 121. If bubbles are generated in the liquid, it indicates that the gas has passed through the space between the first sealing surface 111 and the second sealing surface 121, indicating that the seal has failed; if no bubbles are generated in the liquid, it indicates that the gas cannot pass through the space between the first sealing surface 111 and the second sealing surface 121, indicating that the seal has not failed.

[0130] To observe whether the protective device 3 is melted through, light can be used to illuminate one side of the protective device 3. If the light can pass through the new melt-through hole generated on the protective device 3 and illuminate the other side of the protective device 3, it means that the protective device 3 is melted through. If no new melt-through hole is generated on the protective device 3 and the light cannot pass through the protective device 3, it means that the protective device 3 is not melted through.

[0131] It can be understood that, with the same distance from the pressure relief port 211 of the battery cell 21 along the first direction to the side of the protective device 3 along the first direction away from the pressure relief port 211, the same thickness of the protective device 3, and the use of the same melting point material of the protective device 3, when the projections of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction at least partially overlap, after the thermal runaway of the battery cell 21 ends, the first sealing surface 111 and the second sealing surface 121 do not fail, and the protective device 3 does not melt through; when the projections of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction do not overlap, the first sealing surface 111 and the second sealing surface 121 will not fail, and the protective device 3 will not melt through.

[0132] Exemplarily, when 700°C<T≤1000°C, T=1000°C, D1=8mm, D2=2mm, the target ratio is 7.8125, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 fails.

[0133] Exemplarily, when 700°C<T≤1000°C, T=1000°C, D1=10mm, D2=2mm, the target ratio is 5, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 fails.

[0134] Exemplarily, when 700°C<T≤1000°C, T=1000°C, D1=12mm, D2=2mm, the target ratio is 3.47222, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 does not fail.

[0135] Exemplarily, when 700°C<T≤1000°C, T=1000°C, D1=14mm, D2=2mm, the target ratio is 2.55102, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0136] Exemplarily, when 700°C<T≤1000°C, T=1000°C, D1=16mm, D2=2mm, the target ratio is 1.95313, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0137] "mm" means millimeter.

[0138] In the embodiment of the present application, when the protective device 3 is not melted through by the thermal runaway emissions of the battery cell 21, the protective device 3 can protect the first sealing surface 111 and the second sealing surface 121, and the sealing of the first sealing surface 111 and the second sealing surface 121 will not fail; when the protective device 3 is melted through by the thermal runaway emissions of the battery cell 21, the sealing of the first sealing surface 111 and the second sealing surface 121 may fail or may not fail. When the first preset ratio is 3.4, the first sealing surface 111 and the second sealing surface 121 do not fail, and when the melting point of the protective device 3 is greater than 700°C and less than or equal to 1000°C, it is only necessary to control the target ratio to be less than or equal to 3.4, reduce the possibility of sealing failure of the first sealing surface 111 and the second sealing surface 121, and inhibit the leakage of thermal runaway emissions from between the first sealing surface 111 and the second sealing surface 121.

[0139] It is understandable that the first preset ratio is not limited to 3.4. Exemplarily, the first preset ratio is less than 3.4. Exemplarily, the first preset ratio is 3.3.

[0140] In one embodiment, when the melting point of the protective device 3 is greater than 1000° C. and the melting point of the protective device 3 is less than or equal to 1400° C., the first preset ratio is 32, and the units of the preset thickness and the preset distance are both millimeters.

[0141] Exemplarily, the target ratio is 32, 25, 18, 14 or 6.

[0142] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=8mm, D2=0.6mm, the target ratio is 51.0417, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 fails.

[0143] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=10mm, D2=0.6mm, the target ratio is 32.6667, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 fails.

[0144] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=12mm, D2=0.6mm, the target ratio is 22.6852, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0145] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=14mm, D2=0.6mm, the target ratio is 16.6667, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0146] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=8mm, D2=0.8mm, the target ratio is 38.2813, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 fails.

[0147] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=8mm, D2=1mm, the target ratio is 30.625, the protective device 3 is melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 does not fail.

[0148] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=8mm, D2=1.2mm, the target ratio is 25.5208, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0149] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=8mm, D2=1.4mm, the target ratio is 21.875, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0150] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=10mm, D2=1mm, the target ratio is 19.6, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 does not fail.

[0151] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=10mm, D2=1.2mm, the target ratio is 16.3333, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0152] Exemplarily, when 1000°C<T≤1400°C, T=1400°C, D1=10mm, D2=1.4mm, the target ratio is 14, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0153] In the embodiment of the present application, when the protective device 3 is not melted through by the thermal runaway emissions of the battery cell 21, the protective device 3 can protect the first sealing surface 111 and the second sealing surface 121, and the sealing of the first sealing surface 111 and the second sealing surface 121 will not fail; when the protective device 3 is melted through by the thermal runaway emissions of the battery cell 21, the sealing of the first sealing surface 111 and the second sealing surface 121 may fail or may not fail. When the first preset ratio is 32, the first sealing surface 111 and the second sealing surface 121 do not fail, and when the melting point of the protective device 3 is greater than 1000°C and less than or equal to 1400°C, it is only necessary to control the target ratio to be less than or equal to 32, reduce the possibility of sealing failure of the first sealing surface 111 and the second sealing surface 121, and inhibit the leakage of thermal runaway emissions from between the first sealing surface 111 and the second sealing surface 121.

[0154] It is understandable that the first preset ratio is not limited to 32. Exemplarily, the first preset ratio is less than 32. Exemplarily, the first preset ratio is 31.

[0155] In one embodiment, when the melting point of the protective device 3 is greater than 1400° C. and the melting point of the protective device 3 is less than or equal to 2000° C., the first preset ratio is 104, and the units of the preset thickness and the preset distance are both millimeters.

[0156] Exemplarily, the target ratio is 104, 98, 75, 56, 42, 26 or 15.

[0157] Exemplarily, when 1400°C<T≤2000°C, T=2000°C, D1=8mm, D2=0.4mm, the target ratio is 156.25, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 fails.

[0158] Exemplarily, when 1400°C<T≤2000°C, T=2000°C, D1=8mm, D2=0.6mm, the target ratio is 104.167, the protective device 3 melts through, and the sealing of the first sealing surface 111 and the second sealing surface 121 does not fail.

[0159] Exemplarily, when 1400°C<T≤2000°C, T=2000°C, D1=8mm, D2=0.8mm, the target ratio is 78.125, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0160] Exemplarily, when 1400°C<T≤2000°C, T=2000°C, D1=10mm, D2=0.6mm, the target ratio is 66.6667, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0161] Exemplarily, when 1400°C<T≤2000°C, T=2000°C, D1=12mm, D2=0.6mm, the target ratio is 46.2963, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0162] For example, when 1400°C<T≤2000°C, T=2000°C, D1=14mm, D2=0.6mm, the target ratio is 34.0136, the protective device 3 is not melted through, and the sealing of the first sealing surface 111 and the second sealing surface 121 is not failed.

[0163] In the embodiment of the present application, when the protective device 3 is not melted through by the thermal runaway emissions of the battery cell 21, the protective device 3 can protect the first sealing surface 111 and the second sealing surface 121, and the sealing of the first sealing surface 111 and the second sealing surface 121 will not fail; when the protective device 3 is melted through by the thermal runaway emissions of the battery cell 21, the sealing of the first sealing surface 111 and the second sealing surface 121 may fail or may not fail. When the first preset ratio is 3.4, the first sealing surface 111 and the second sealing surface 121 do not fail, and when the melting point of the protective device 3 is greater than 1400°C and less than or equal to 2000°C, it is only necessary to control the target ratio to be less than or equal to 104, reduce the possibility of sealing failure of the first sealing surface 111 and the second sealing surface 121, and inhibit the leakage of thermal runaway emissions from between the first sealing surface 111 and the second sealing surface 121.

[0164] It is understandable that the first preset ratio is not limited to 104. Exemplarily, the first preset ratio is less than 104. Exemplarily, the first preset ratio is 103.

[0165] In one embodiment, the target ratio is less than or equal to a second preset ratio to suppress the protection device 3 from being melted through, and the second preset ratio is less than the first preset ratio.

[0166] In the embodiment of the present application, the second preset ratio is smaller than the first preset ratio, the target ratio is less than or equal to the second preset ratio, the protection device 3 will not be melted through by the emission of thermal runaway of the battery cell 21, and the sealing of the first sealing surface 111 and the second sealing surface 121 will basically not fail. The protection device 3 is not melted through, and the protection device 3 can continue to protect the first sealing surface 111 and the second sealing surface 121, thereby improving the safety and robustness of the box body 1.

[0167] It is understandable that the second preset ratio is not limited to being smaller than the first preset ratio. Exemplarily, the second preset ratio is equal to the first preset ratio.

[0168] In one embodiment, when the melting point of the protective device 3 is greater than 700° C. and the melting point of the protective device 3 is less than or equal to 1000° C., the second preset ratio is 2.5, and the units of the preset thickness and the preset distance are both millimeters.

[0169] Illustratively, the target ratio is 2.5, 2.1, 1.8 or 0.5.

[0170] In the embodiment of the present application, when the melting point of the protective device 3 is greater than 700°C and less than or equal to 1000°C, the test shows that the second preset ratio is 2.5, and the protective device 3 will not be melted through. The target ratio is less than or equal to 2.5, which reduces the possibility of the protective device 3 being melted through by thermal runaway emissions. The protective device 3 protects the first sealing surface 111 and the second sealing surface 121, reducing the possibility of sealing failure.

[0171] It is understandable that the second preset ratio is not limited to 2.5. Exemplarily, the second preset ratio is less than 2.5. Exemplarily, the second preset ratio is 2.4.

[0172] In one embodiment, when the melting point of the protective device 3 is greater than 1000° C. and the melting point of the protective device 3 is less than or equal to 1400° C., the second preset ratio is 22.5, and the units of the preset thickness and the preset distance are both millimeters.

[0173] Illustratively, the target ratio is 22.5, 20, 11.5 or 6.

[0174] In the embodiment of the present application, when the melting point of the protective device 3 is greater than 1000°C and less than or equal to 1400°C, the test shows that the second preset ratio is 22.5, and the protective device 3 will not be melted through. The target ratio is less than or equal to 2.5, which reduces the possibility of the protective device 3 being melted through by thermal runaway emissions. The protective device 3 protects the first sealing surface 111 and the second sealing surface 121, reducing the possibility of sealing failure.

[0175] It is understandable that the second preset ratio is not limited to 22.5. Exemplarily, the second preset ratio is less than 22.5. Exemplarily, the second preset ratio is 22.

[0176] In one embodiment, when the melting point of the protective device 3 is greater than 1400° C. and the melting point of the protective device 3 is less than or equal to 2000° C., the second preset ratio is 78, and the units of the preset thickness and the preset distance are both millimeters.

[0177] Exemplarily, the target ratio is 78, 65, 40, 34 or 25.

[0178] In the embodiment of the present application, when the melting point of the protective device 3 is greater than 1000°C and less than or equal to 1400°C, the test shows that the second preset ratio is 78, and the protective device 3 will not be melted through. The target ratio is less than or equal to 2.5, which reduces the possibility of the protective device 3 being melted through by thermal runaway emissions. The protective device 3 protects the first sealing surface 111 and the second sealing surface 121, reducing the possibility of sealing failure.

[0179] It is understandable that the second preset ratio is not limited to 78. Exemplarily, the second preset ratio is less than 78. Exemplarily, the second preset ratio is 77.

[0180] In one embodiment, the overlapping projections of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction are the target projections, and the target projections are located within the projection area of ​​the protective device 3 along the first direction.

[0181] The projections of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction overlap. The projection area of ​​the first sealing surface 111 and the second sealing surface 121 along the first direction may partially overlap with the projection area of ​​the pressure relief port 211 along the first direction, or the projection edges of the first sealing surface 111 and the second sealing surface 121 along the first direction may contact with the projection edges of the pressure relief port 211 along the first direction.

[0182] When the projection of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction do not overlap, the possibility of the discharge discharged from the pressure relief port 211 spraying onto the first sealing surface 111 and the second sealing surface 121 is reduced, thereby reducing the possibility of sealing failure of the first sealing surface 111 and the second sealing surface 121.

[0183] It should be noted that the first box body 11 and the second box body 12 themselves have a certain protective effect. Except for the first sealing surface 111, other parts of the first box body 11 will not be damaged by the emissions of the battery cell 21 due to thermal runaway without the protection of the protective device 3. Except for the second sealing surface 121, other parts of the second box body 12 will not be damaged by the emissions of the battery cell 21 due to thermal runaway without the protection of the protective device 3.

[0184] In the embodiment of the present application, the projections of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction overlap, and the thermal runaway emissions discharged from the pressure relief port 211 may be directly sprayed onto the first sealing surface 111 and the second sealing surface 121, resulting in sealing failure. The target projection is located within the projection area of ​​the protective device 3 along the first direction. The protective device 3 protects the first sealing surface 111 and the second sealing surface 121 corresponding to the target projection area, which can effectively reduce the possibility of damage to the sealing structure of the first sealing surface 111 and the second sealing surface 121.

[0185] In one embodiment, please refer to Figure 1 , Figure 4 and Figure 5 The number of battery cells 21 in each battery cell assembly 2 is at least two, at least two battery cells 21 are arranged along a third direction, the third direction is arranged crosswise with the first direction and the second direction respectively, the pressure relief direction of all pressure relief ports 211 in the same battery cell assembly 2 is the same, the number of protective devices 3 is at least two, a protective device 3 is correspondingly provided for the pressure relief port 211 of each battery cell 21, and at least two protective devices 3 are arranged at intervals along the third direction.

[0186] It should be noted that the same pressure relief direction of all the pressure relief openings 211 in the same battery cell assembly 2 means that all the pressure relief openings 211 in the same battery cell assembly 2 are facing the direction of the protective device 3 .

[0187] It should be noted that the at least two protection devices 3 are arranged at intervals, which means that there is a gap between the at least two protection devices 3 or the distance between the at least two protection devices 3 is greater than zero.

[0188] The third direction is arranged to cross the first direction and the second direction respectively, the first direction, the second direction and the third direction intersect each other and are not coplanar, the first direction is arranged to cross the second direction, the second direction is arranged to cross the third direction, and the first direction is arranged to cross the third direction.

[0189] Exemplarily, the first direction intersects the second direction perpendicularly, the second direction intersects the third direction perpendicularly, and the first direction intersects the third direction perpendicularly.

[0190] In the embodiment of the present application, a protective device 3 is correspondingly provided for the pressure relief port 211 of each battery cell 21, and at least two protective devices 3 are arranged at intervals along the third direction. The thermal runaway emissions ejected from the pressure relief port 211 damage the first sealing surface 111 and the second sealing surface 121. The first sealing surface 111 and the second sealing surface 121 at the position where there is no pressure relief port 211 will not be damaged by the thermal runaway emissions. The protective device 3 is only provided at the position corresponding to the pressure relief port 211. The protective device 3 may not be provided at the position where there is no pressure relief port 211, which does not affect the protective effect on the first sealing surface 111 and the second sealing surface 121, and the number and volume of the protective devices 3 can be reduced.

[0191] In one embodiment, please refer to Figure 2 The number of battery cells 21 in each battery cell assembly 2 is at least two, and at least two battery cells 21 are arranged along a third direction, and the third direction is arranged crosswise with the first direction and the second direction respectively. The pressure relief direction of all pressure relief ports 211 in the same battery cell assembly 2 is the same, and a protective device 3 is correspondingly arranged between each battery cell assembly 2 and the first sealing surface 111 along the first direction, and the protective device 3 extends from one end of the battery cell assembly 2 to the other end of the battery cell assembly 2 along the third direction.

[0192] In the embodiment of the present application, the protective device 3 extends from one end of the battery cell assembly 2 to the other end of the battery cell assembly 2 along the third direction. The protective device 3 completely blocks the first sealing surface 111 and the second sealing surface 121 along the third direction, thereby reducing the situation where the protection failure is caused by the installation error of the protective device 3. The protective device 3 has a good protective effect on the first sealing surface 111 and the second sealing surface 121. The installation of the protective device 3 is not restricted by the battery cell 21, and the protective device 3 is easy to install.

[0193] In one embodiment, the protection device 3 is glued to the box body 1 .

[0194] In the embodiment of the present application, the protective device 3 is glued to the box body 1, and the protective device 3 is easy to install.

[0195] It is understandable that the protective device 3 and the box body 1 are not limited to being glued. For example, the protective device 3 and the box body 1 are snap-connected. For example, the protective device 3 and the box body 1 are threadedly connected.

[0196] In one embodiment, please refer to Figure 5~Figure 7 The first sealing surface 111 and the second sealing surface 121 are arranged opposite to each other along the second direction.

[0197] In one embodiment, the melting point of the protection device 3 is greater than 700°C.

[0198] Exemplarily, the melting point of the protection device 3 is 701°C, 750°C, 800°C, 900°C or 1000°C.

[0199] In the embodiment of the present application, the melting point of the protective device 3 is greater than 700°C, and the protective device 3 has good high temperature resistance, so that the protective device 3 can use a smaller thickness to meet the protective effect, and the distance between the protective device 3 and the pressure relief port 211 along the first direction does not need to be set too large to meet the protective effect, thereby reducing the volume of the battery device.

[0200] It is understood that the melting point of the protective device 3 is not limited to greater than 700° C. Exemplarily, the melting point of the protective device 3 is less than or equal to 700° C. Exemplarily, the melting point of the protective device 3 is 699° C.

[0201] In one embodiment, the material of the protective device 3 is any one of mica, ceramic, ceramic composite material, metal, metal alloy, carbon fiber, and carbon fiber composite material.

[0202] In the embodiment of the present application, there are many types of materials that can be selected for the protective device 3, and a suitable material can be selected according to actual needs.

[0203] It is understandable that the material of the protective device 3 is not limited to any one of mica, ceramic, ceramic composite material, metal, metal alloy, carbon fiber, and carbon fiber composite material. Exemplarily, the material of the protective device 3 is not limited, and any protective material with a melting point greater than 700° C. can be used for the protective device 3.

[0204] In one embodiment, please refer to Figure 4~Figure 7 The protection device 3 is arranged across the inner surfaces of the side walls of the first box body 11 and the second box body 12 along the second direction.

[0205] It should be noted that the inner surface of the side wall of the protective device 3 spanning the first box body 11 and the second box body 12 along the first direction is that the projection of the inner surface of the side wall of the first box body 11 along the first direction at least partially overlaps with the projection of the protective device 3 along the first direction, and the projection of the inner surface of the side wall of the second box body 12 along the first direction at least partially overlaps with the projection of the protective device 3 along the first direction.

[0206] In the embodiment of the present application, the protective device 3 is arranged across the inner surfaces of the side walls of the first box body 11 and the second box body 12 along the second direction, so that the size of the protective device 3 along the second direction is large enough, thereby improving the protective effect of the protective device 3 and facilitating the installation of the protective device 3.

[0207] It is understandable that the protection device 3 is not limited to being arranged along the first direction across the inner surface of the side walls of the first box body 11 and the second box body 12. Exemplarily, the protection device 3 is bounded by the first sealing surface 111 and the second sealing surface 121.

[0208] In one embodiment, please refer to Figure 3 , Figure 6 and Figure 7The battery device also includes a mounting plate 4 connected to the protective device 3 , and the mounting plate 4 is clamped between the first box body 11 and the second box body 12 .

[0209] It should be noted that the mounting plate 4 being clamped between the first box body 11 and the second box body 12 means that the mounting plate 4 is clamped between the first sealing surface 111 and the second sealing surface 121 .

[0210] Exemplarily, the mounting plate 4 is locked on the first box body 11 .

[0211] In the embodiment of the present application, the mounting plate 4 is clamped between the first box body 11 and the second box body 12 , and the first box body 11 and the second box body 12 clamp the mounting plate 4 to limit the movement of the protective device 3 along the second direction, thereby improving the installation stability of the protective device 3 .

[0212] It is understandable that the battery device may not be provided with the mounting plate 4 .

[0213] In one embodiment, please refer to Figure 3 , Figure 6 and Figure 7 , the protective device 3 protrudes from the opposite sides of the mounting plate 4 along the second direction.

[0214] In the embodiment of the present application, the mounting plate 4 is clamped between the first box body 11 and the second box body 12, and the protective device 3 protrudes from the opposite sides of the mounting plate 4 along the second direction, so that the protective device 3 can cover the first sealing surface 111 and the second sealing surface 121 as much as possible along the second direction, thereby improving the protective effect.

[0215] It is understandable that the protection device 3 is not limited to protruding from opposite sides of the mounting plate 4 along the second direction. Exemplarily, the protection device 3 protrudes from one side of the mounting plate 4 along the second direction, and the other side of the protection device 3 along the second direction is flush with the mounting plate 4.

[0216] In one embodiment, please refer to Figure 1 , Figure 5 and Figure 6 There are two battery cell assemblies 2 , and the pressure relief port 211 of the battery cell 21 in each battery cell assembly 2 is located on a side of the corresponding housing 212 away from the corresponding other battery cell assembly 2 .

[0217] In the embodiment of the present application, the pressure relief port 211 of the battery cell 21 in each battery cell assembly 2 is located on the side of the corresponding outer shell 212 away from the corresponding other battery cell assembly 2, and the pressure relief port 211 of the battery cell 21 will not face other battery cell assemblies 2, thereby reducing the situation where thermal runaway emissions are sprayed toward the battery cells 21 of other battery cell assemblies 2, reducing the mutual influence of thermal runaway between the battery cell assemblies 2, and improving the safety of the battery cell assembly 2.

[0218] It is understandable that the pressure relief port 211 of the battery cell 21 in each battery cell assembly 2 is not limited to being located on the side of the corresponding housing 212 away from the corresponding other battery cell assembly 2. Exemplarily, the pressure relief port 211 of the battery cell 21 in each battery cell assembly 2 is located on the side of the corresponding housing 212 facing the corresponding other battery cell assembly 2.

[0219] It is understandable that the number of the battery cell assemblies 2 is not limited to two. Exemplarily, the number of the battery cell assemblies 2 is at least two.

[0220] Exemplarily, the number of battery cell assemblies 2 is 4, 6, 8 or 10.

[0221] In one embodiment, please refer to Figure 8 and Fig. 9 One end of the protective device 3 along the second direction facing the first sealing surface 111 is integrally formed with the first box body 11 , and one end of the protective device 3 along the second direction facing the second sealing surface 121 protrudes from the first sealing surface 111 .

[0222] In the embodiment of the present application, one end of the protective device 3 along the second direction facing the first sealing surface 111 is integrally formed with the first box body 11, and one end of the protective device 3 along the second direction facing the second sealing surface 121 protrudes from the first sealing surface 111. The protruding portion of the protective device 3 can cover the first sealing surface 111 and the second sealing surface 121, and does not affect the protective effect of the protective device 3. The protective device 3 integrally formed with the first box body 11 does not need to be installed, thereby improving the production efficiency of the battery device.

[0223] In one embodiment, please refer to Figure 8 and Fig. 9 The protective device 3 is a first protrusion 31, and the first box body 11 is also formed with a second protrusion 32. The second protrusion 32 protrudes from the first sealing surface 111 along one side of the first sealing surface 111 toward the second sealing surface 121. The first sealing surface 111 and the second sealing surface 121 are both located between the first protrusion 31 and the second protrusion 32 along the first direction.

[0224] In the embodiment of the present application, the first protrusion 31 and the second protrusion are arranged to have a structure with multiple bends. The resistance to the flow of the fluid in the structure with multiple bends is relatively large, which is beneficial for suppressing the thermal runaway emissions in the accommodating space from escaping from between the first sealing surface 111 and the second sealing surface 121, thereby improving the sealing effect of the first sealing surface 111 and the second sealing surface 121.

[0225] It is understandable that the first box body 11 may not be provided with the second protruding portion 32 .

[0226] It is understandable that the second protrusion 32 is not limited to protruding from the first sealing surface 111 along the side of the first sealing surface 111 facing the second sealing surface 121. Exemplarily, the second protrusion 32 protrudes from the first sealing surface 111 along the side of the first sealing surface 111 away from the second sealing surface 121.

[0227] In one embodiment, please refer to Figure 8 and Fig. 9 The battery device further includes a sealing medium layer 5 located between the first protrusion 31 and the second protrusion 32 , and the sealing medium layer 5 is in contact and sealed with the first sealing surface 111 and the second sealing surface 121 respectively.

[0228] In the embodiment of the present application, the sealing medium layer 5 contacts and seals with the first sealing surface 111 and the second sealing surface 121 respectively. The sealing medium layer 5 can improve the sealing effect between the first sealing surface 111 and the second sealing surface 121 .

[0229] It is understandable that the battery device may not be provided with the sealing medium layer 5. Exemplarily, the first sealing surface 111 and the second sealing surface 121 are in contact and sealed.

[0230] In one embodiment, please refer to Figure 8 and Fig. 9 The battery device further includes a connector 6 , which is respectively connected to the first box body 11 and the second box body 12 so that the first box body 11 is installed on the second box body 12 , and the connector 6 is located on a side of the second protrusion 32 away from the first protrusion 31 .

[0231] In the embodiment of the present application, the connecting member 6 is respectively connected to the first box body 11 and the second box body 12 so that the first box body 11 is installed on the second box body 12, so that the first box body 11 and the second box body 12 are firmly installed. The connecting member 6 is located on the side of the second protrusion 32 away from the first protrusion 31, and the connecting member 6 is located outside the sealing part of the first sealing surface 111 and the second sealing surface 121. The connecting member 6 will not affect the sealing of the first sealing surface 111 and the second sealing surface 121, thereby improving the sealing effect of the first sealing surface 111 and the second sealing surface 121.

[0232] It is understandable that the connecting member 6 is not limited to being located at the side of the second protrusion 32 away from the first protrusion 31. Exemplarily, the connecting member 6 is located between the first protrusion 31 and the second protrusion 32.

[0233] In one embodiment, please refer to Figure 1~Figure 3 The battery cell 21 further includes a pressure relief mechanism 7 covering the pressure relief port 211 , and the pressure relief mechanism 7 is installed on the housing 212 .

[0234] Exemplarily, the pressure relief mechanism 7 is an explosion-proof valve covering the pressure relief port 211 .

[0235] Exemplarily, the pressure relief structure may be a flame retardant cover or mica paper.

[0236] In the embodiment of the present application, the pressure relief mechanism 7 is covered on the pressure relief port 211. The pressure relief mechanism 7 has a certain flame retardant ability. When the battery cell 21 needs to discharge the thermal runaway emissions, the pressure relief structure opens and the pressure relief port 211 discharges the thermal runaway emissions. When the battery cell 21 does not need to discharge the thermal runaway emissions, the pressure relief mechanism 7 closes the pressure relief port 211. In the event of thermal runaway of an adjacent battery cell 21, the possibility of the thermal runaway emissions of the adjacent battery cell 21 entering the interior of the battery cell 21 through the pressure relief port 211 can be reduced, which is beneficial to suppressing the spread of thermal runaway to a certain extent.

[0237] It is understandable that the battery cell 21 may not be provided with the pressure relief mechanism 7 .

[0238] In one embodiment, the test results of whether the protective device 3 is melted through and whether the seal of the first sealing surface 111 and the second sealing surface 121 fails are shown in Table 1. In the table, a represents the minimum distance between the projection of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction, a≤0 represents that the projection of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction at least partially overlap, and a>0 represents that the projection of the first sealing surface 111 and the second sealing surface 121 along the first direction and the projection of the pressure relief port 211 along the first direction do not overlap. In the table, T represents the preset melting point of the protective device 3, D1 represents the preset distance, D2 represents the target thickness, and the formula T 2 / (D2*D1 2 ) represents the target ratio.

[0239] Table 1

[0240]

[0241] In one embodiment, please refer to Figure 1 to Figure 7The battery device includes a battery cell assembly 2, a box body 1 and a protective device 3. The battery cell assembly 2 includes at least one battery cell 21. The battery cell 21 includes a shell 212 and an electrode assembly located in the shell 212. The shell 212 has a pressure relief port 211. The pressure relief port 211 is located on one side of the shell 212 along a first direction. The box body 1 has a receiving cavity 13. The battery cell 21 is located in the receiving cavity 13. The box body 1 includes a first box body 11 and a second box body 12 connected to each other. The first box body 11 and the second box body 12 are arranged along a second direction. The second direction is arranged crosswise with the first direction. The first box body 11 has a first sealing member on one side facing the second box body 12. The cover 111, the second box body 12 has a second sealing surface 121 on one side facing the first box body 11, the first sealing surface 111 and the second sealing surface 121 are at least partially sealed, the shell 212 is correspondingly provided with the first sealing surface 111 and the second sealing surface 121 on one side facing the pressure relief port 211 along the first direction, a protective device 3 is provided between the pressure relief port 211 and the corresponding first sealing surface 111 along the first direction, the protective device 3 is arranged across the first sealing surface 111 and the second sealing surface 121 along the second direction, the minimum thickness of the protective device 3 along the first direction is a preset thickness, the pressure relief port 211 and the protective device 3 are away from the pressure relief port 211 along the first direction The minimum distance of the surface of one side along the first direction is the preset distance, the product of the square of the preset distance and the preset thickness is the target parameter, the melting point of the protective device 3 is the preset melting point, the ratio of the square of the preset melting point to the target parameter is the target ratio, the target ratio is less than or equal to the first preset ratio so that the first sealing surface 111 and the second sealing surface 121 are sealed, when the melting point of the protective device 3 is greater than 700°C and the melting point of the protective device 3 is less than or equal to 1000°C, the first preset ratio is 3.4, the units of the preset thickness and the preset distance are both millimeters, when the melting point of the protective device 3 is greater than 1000°C and the melting point of the protective device 3 is less than or equal to In the case of 1400°C, the first preset ratio is 32. In the case of the melting point of the protective device 3 being greater than 1400°C and the melting point of the protective device 3 being less than or equal to 2000°C, the first preset ratio is 104. The target ratio is less than or equal to the second preset ratio to inhibit the protective device 3 from being melted through. The second preset ratio is less than the first preset ratio. In the case of the melting point of the protective device 3 being greater than 700°C and the melting point of the protective device 3 being less than or equal to 1000°C, the second preset ratio is 2.5. In the case of the melting point of the protective device 3 being greater than 1000°C and the melting point of the protective device 3 being less than or equal to 1400°C, the second preset ratio is 22.5. When the melting point of the protective device 3 is greater than 1400°C and the melting point of the protective device 3 is less than or equal to 2000°C, the second preset ratio is 78, the projection of the first sealing surface 111 and the second sealing surface 121 along the first direction and the overlapping projection of the pressure relief port 211 along the first direction are the target projection, the target projection is located within the projection area of ​​the protective device 3 along the first direction, the number of battery cells 21 in each battery cell assembly 2 is at least two, at least two battery cells 21 are arranged along a third direction, the third direction is arranged crosswise with the first direction and the second direction, the pressure relief directions of all the pressure relief ports 211 in the same battery cell assembly 2 are the same, and the protective device 3 The number is at least two, and each pressure relief port 211 of each battery cell 21 is correspondingly provided with a protective device 3. At least two protective devices 3 are arranged at intervals along the third direction. The protective device 3 is glued to the box body 1. The melting point of the protective device 3 is greater than 700°C. The material of the protective device 3 is any one of mica, ceramic, ceramic composite material, metal, metal alloy, carbon fiber, and carbon fiber composite material. The protective device 3 is arranged across the inner surface of the side wall of the first box body 11 and the second box body 12 along the second direction. The number of battery cell assemblies 2 is two, and the pressure relief port 211 of the battery cell 21 in each battery cell assembly 2 is located on the side of the corresponding shell 212 away from the corresponding other battery cell assembly 2. .

[0242] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application is described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 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.

Claims

1. A battery device, characterized in that: include: A battery cell assembly, comprising at least one battery cell, wherein the battery cell comprises a housing and an electrode assembly located in the housing, wherein the housing has a pressure relief port, and the pressure relief port is located on one side of the housing along a first direction; A box body, having a receiving cavity, wherein the battery cell is located in the receiving cavity, wherein the box body comprises a first box body and a second box body connected to each other, wherein the first box body and the second box body are arranged along a second direction, wherein the second direction is arranged crosswise with the first direction, wherein the first box body has a first sealing surface on a side facing the second box body, and the second box body has a second sealing surface on a side facing the first box body, wherein the first sealing surface and the second sealing surface are at least partially sealed, and wherein the first sealing surface and the second sealing surface are correspondingly arranged on a side of the housing along the first direction facing the pressure relief port; A protective device, wherein the protective device is disposed between the pressure relief port and the corresponding first sealing surface along the first direction, and the protective device is disposed across the first sealing surface and the second sealing surface along the second direction; The minimum thickness of the protective device along the first direction is a preset thickness, the minimum distance between the pressure relief port and the surface of the protective device along the first direction facing away from the pressure relief port is a preset distance, the product of the square of the preset distance and the preset thickness is a target parameter, the melting point of the protective device is a preset melting point, the ratio of the square of the preset melting point to the target parameter is a target ratio, and the target ratio is less than or equal to a first preset ratio to maintain a seal between the first sealing surface and the second sealing surface.

2. The battery device according to claim 1, characterized in that: When the melting point of the protective device is greater than 700° C. and the melting point of the protective device is less than or equal to 1000° C., the first preset ratio is 3.4, and the units of the preset thickness and the preset distance are both millimeters.

3. The battery device according to claim 1, characterized in that: When the melting point of the protective device is greater than 1000° C. and the melting point of the protective device is less than or equal to 1400° C., the first preset ratio is 32, and the units of the preset thickness and the preset distance are both millimeters.

4. The battery device according to claim 1, characterized in that: When the melting point of the protective device is greater than 1400° C. and the melting point of the protective device is less than or equal to 2000° C., the first preset ratio is 104, and the units of the preset thickness and the preset distance are both millimeters.

5. The battery device according to claim 1, characterized in that: The target ratio is less than or equal to a second preset ratio to suppress the protection device from being melted through, and the second preset ratio is less than the first preset ratio.

6. The battery device according to claim 5, characterized in that: When the melting point of the protective device is greater than 700° C. and the melting point of the protective device is less than or equal to 1000° C., the second preset ratio is 2.5, and the units of the preset thickness and the preset distance are both millimeters.

7. The battery device according to claim 5, characterized in that: When the melting point of the protective device is greater than 1000° C. and the melting point of the protective device is less than or equal to 1400° C., the second preset ratio is 22.5, and the units of the preset thickness and the preset distance are both millimeters.

8. The battery device according to claim 5, characterized in that: When the melting point of the protective device is greater than 1400° C. and the melting point of the protective device is less than or equal to 2000° C., the second preset ratio is 78, and the units of the preset thickness and the preset distance are both millimeters.

9. The battery device according to any one of claims 1 to 8, characterized in that: The overlapping projections of the first sealing surface and the second sealing surface along the first direction and the projection of the pressure relief port along the first direction are the target projections, and the target projections are located within the projection area of ​​the protective device along the first direction.

10. The battery device according to claim 9, characterized in that: The number of the battery cells in each battery cell assembly is at least two, at least two of the battery cells are arranged along a third direction, the third direction is arranged crosswise with the first direction and the second direction respectively, the pressure relief direction of all the pressure relief ports in the same battery cell assembly is the same, the number of the protective devices is at least two, the pressure relief port of each battery cell is correspondingly provided with the protective device, and at least two of the protective devices are arranged at intervals along the third direction.

11. The battery device according to any one of claims 1 to 8, characterized in that: The number of the battery cells in each battery cell assembly is at least two, at least two of the battery cells are arranged along a third direction, the third direction is arranged crosswise with the first direction and the second direction respectively, the pressure relief direction of all the pressure relief ports in the same battery cell assembly is the same, and a protective device is correspondingly arranged between each battery cell assembly and the first sealing surface along the first direction, and the protective device extends along the third direction from one end of the battery cell assembly to the other end of the battery cell assembly.

12. The battery device according to any one of claims 1 to 8, characterized in that: The protective device is glued to the box body.

13. The battery device according to claim 1, characterized in that: The melting point of the protective device is greater than 700°C.

14. The battery device according to any one of claims 1 to 8, characterized in that: The material of the protective device is any one of mica, ceramic, ceramic composite material, metal, metal alloy, carbon fiber, and carbon fiber composite material.

15. The battery device according to any one of claims 1 to 8, characterized in that: The protection device is arranged across the inner surfaces of the side walls of the first box body and the second box body along the second direction.

16. The battery device according to any one of claims 1 to 8, characterized in that: The battery device further comprises a mounting plate connected to the protection device, wherein the mounting plate is clamped between the first box body and the second box body.

17. The battery device according to claim 16, characterized in that: The protection device protrudes from opposite sides of the mounting plate along the second direction.

18. The battery device according to any one of claims 1 to 8, characterized in that: The number of the battery cell assemblies is two, and the pressure relief port of the battery cell in each of the battery cell assemblies is located on a side of the corresponding housing that is away from the corresponding other battery cell assembly.

19. The battery device according to any one of claims 1 to 8, characterized in that: One end of the protective device facing the first sealing surface along the second direction is integrally formed with the first box body, and one end of the protective device facing the second sealing surface along the second direction protrudes from the first sealing surface.

20. The battery device according to claim 19, characterized in that The protective device is a first protrusion, and the first box body is also formed with a second protrusion, the second protrusion protrudes from the first sealing surface along the side of the first sealing surface toward the second sealing surface, and the first sealing surface and the second sealing surface are both located between the first protrusion and the second protrusion along the first direction.

21. The battery device according to claim 20, characterized in that The battery device further includes a sealing medium layer located between the first protrusion and the second protrusion, and the sealing medium layer is in contact and sealed with the first sealing surface and the second sealing surface respectively.

22. The battery device according to claim 20, characterized in that The battery device further includes a connector, which is respectively connected to the first box body and the second box body so that the first box body is installed on the second box body, and the connector is located on a side of the second protrusion away from the first protrusion.

23. The battery device according to any one of claims 1 to 8, characterized in that: The battery cell further includes a pressure relief mechanism covering the pressure relief port, and the pressure relief mechanism is installed on the housing.

24. An electrical device, characterized in that: include: Device body; The battery device according to any one of claims 1 to 23 is installed in the device body to supply power to the device body.

Images