Battery device and electric device

Abstract

The utility model provides a battery device and an electric device. The battery device comprises a box body which comprises wall plates and an accommodating cavity enclosed by the wall plates; the single battery is arranged in the accommodating cavity, and the single battery comprises a pressure relief mechanism; the collecting mechanism is arranged between the wall plate and the at least one pressure relief mechanism, the collecting mechanism comprises a cavity wall and a cavity enclosed by the cavity wall, the pressure in the cavity is smaller than the standard atmospheric pressure, the collecting mechanism is configured to enable the cavity wall to be fused after the pressure relief mechanism is actuated, and the cavity is communicated with the containing cavity, so that when the pressure relief mechanism is actuated, the collecting mechanism is separated from the containing cavity. The cavity wall, the cavity and the containing cavity of the fusion part are communicated through the high-temperature sprayed matter, at least part of the high-temperature matter can be collected into the cavity wall under the negative pressure effect, the risk that the high-temperature sprayed matter ablates other devices in the containing cavity is reduced, and the problem that the high-temperature sprayed matter causes pressure rise in the containing cavity can be solved through the low-pressure environment in the cavity. The risk that the box body is cracked and torn under the high-pressure effect is reduced, and the reliability of the battery device is improved.

Description

Technical Field

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

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the related art, several battery cells are usually placed in a box to be integrated into a battery device for use. However, there is a risk of thermal runaway during the use of the battery cells. How to reduce the damage to other components of the battery device when certain battery cells have thermal runaway and improve the reliability of the battery device is an issue that requires continuous attention. Utility Model Content

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device, comprising: a box body, comprising a wall plate and a accommodating cavity enclosed by the wall plate; a battery cell, arranged in the accommodating cavity, the battery cell comprising a pressure relief mechanism; a collecting mechanism, arranged between the wall plate and at least one pressure relief mechanism, the collecting mechanism comprising a cavity wall and a cavity enclosed by the cavity wall, the pressure in the cavity is less than the standard atmospheric pressure, and the collecting mechanism is configured so that the cavity wall is melted after the pressure relief mechanism is actuated, and the cavity is connected to the accommodating cavity.

[0006] In the scheme of the embodiment of the present application, the battery device includes a box body, a battery cell and a collecting mechanism, the box body includes a wall panel and a accommodating cavity surrounded by the wall panel, the battery cell is arranged in the accommodating cavity, the collecting mechanism includes a cavity wall and a cavity surrounded by the cavity wall, the pressure in the cavity is less than the standard atmospheric pressure, the battery cell includes a pressure relief mechanism, and the pressure relief mechanism is configured to be actuated to release the temperature or pressure when the internal pressure and temperature of the battery cell exceed a threshold value. By arranging the collecting mechanism between the wall panel and the pressure relief mechanism, when the pressure relief mechanism is actuated, its high-temperature ejecta melts part of the cavity wall, the cavity and the accommodating cavity are connected, and under the action of negative pressure, at least part of the high-temperature material can be collected in the cavity wall, thereby reducing the risk of high-temperature ejecta burning other devices in the accommodating cavity, and the low-pressure environment in the cavity can alleviate the problem of high-temperature ejecta causing the pressure in the accommodating cavity to increase, thereby reducing the risk of the box body bursting and tearing under high pressure, thereby improving the reliability of the battery device.

[0007] In these embodiments, the cavity wall includes a base and a weakened portion that are interconnected, the melting point of the weakened portion is lower than the melting point of the base, and / or the structural strength of the weakened portion is lower than the structural strength of the base, and the weakened portion and at least one pressure relief mechanism are arranged opposite to each other.

[0008] In the solution of the embodiment of the present application, the weakening portion and at least one pressure relief mechanism are arranged opposite to each other, so that the high-temperature ejecta can destroy the cavity wall more quickly, so that the high-temperature ejecta can be collected in the cavity more quickly, thereby improving the reliability of the battery device.

[0009] In these embodiments, the battery device also includes an isolation mechanism, which is arranged between the collection mechanism and the battery cell. The isolation mechanism includes a main body and at least one guide channel running through the main body. The guide channel includes a first port and a second port arranged opposite to each other. The first port is arranged toward at least one pressure relief mechanism, and the second port is arranged toward the collection mechanism.

[0010] In the scheme of the embodiment of the present application, the battery device also includes an isolation mechanism arranged between the collecting mechanism and the battery cell, the isolation mechanism includes a guide channel, the first port of the guide channel is arranged toward the pressure relief mechanism, and the second port of the guide channel is arranged toward the collecting mechanism. The high-temperature ejecta of the pressure relief mechanism is guided through the guide channel to melt the cavity wall, thereby reducing the risk of the high-temperature ejecta diffusing and ablating other components in the box, thereby improving the reliability of the battery device.

[0011] In these embodiments, the cavity wall includes a base and a weakened portion connected to each other, the melting point of the weakened portion is lower than the melting point of the base, and / or the structural strength of the weakened portion is lower than the structural strength of the base, and the second port is arranged toward at least one weakened portion.

[0012] In the solution of the embodiment of the present application, the high-temperature ejecta of the pressure relief mechanism is guided to the weakened portion through a guide channel, and the guide channel plays a role in guiding and gathering the high-temperature substances so that the weakened portion is destroyed faster, thereby improving the reliability of the battery device.

[0013] In these embodiments, at least a portion of the isolation mechanism is connected to the battery cell, and at least one pressure relief mechanism is located within the first port.

[0014] In the solution of the embodiment of the present application, at least one pressure relief mechanism is located at the first port, which improves the problem of high-temperature ejecta ejected from the pressure relief mechanism escaping outside the pressure relief channel and ablating other components in the box, thereby improving the reliability of the battery device.

[0015] In these embodiments, the collecting mechanism and at least a portion of the isolating mechanism are spaced apart from each other so that a first pressure relief space is formed between the collecting mechanism and the isolating mechanism.

[0016] In the solution of the embodiment of the present application, a first pressure relief space is formed between the collecting mechanism and the isolating mechanism to release the internal pressure of the battery cell during the process of the high-temperature ejecta melting the cavity wall, thereby reducing the degree of thermal runaway of the battery cell and improving the reliability of the battery device.

[0017] In these embodiments, the isolation mechanism further includes support members, at least two support members are spaced apart and arranged on a side of the body facing the collection mechanism, and the support members are connected to the collection mechanism.

[0018] In the solution of the embodiment of the present application, the isolation mechanism also includes a support member, at least two support members are spaced apart and arranged on the side of the main body facing the collecting mechanism, and the support member and the collecting mechanism are connected so that the support member can support and fix the collecting mechanism, thereby improving the reliability of the battery device.

[0019] In these embodiments, the wall panel includes a first wall portion and a second wall portion, the second wall portion encloses a accommodating space including an opening, the battery cell is arranged in the accommodating space, the first wall portion covers the opening to form a accommodating cavity, wherein the pressure relief mechanism is arranged at one end of the battery cell facing the first wall portion, and the first wall portion is connected to the collecting mechanism.

[0020] In the solution of the embodiment of the present application, the pressure relief mechanism is arranged at one end of the battery cell facing the first wall portion, and the collecting mechanism is arranged between the pressure relief mechanism and the first wall portion. The first wall portion and the collecting mechanism are connected, which not only reduces the difficulty of matching the collecting mechanism and the box body, but also helps to fix the position of the collecting mechanism, reduce the risk of the collecting mechanism moving in the box body, and improve the reliability of the battery device.

[0021] In these embodiments, the collection mechanism further includes a firefighting medium, the firefighting medium being contained within the chamber.

[0022] In the solution of the embodiment of the present application, a fire-fighting medium is arranged in the chamber to reduce the temperature of the high-temperature ejected matter entering the chamber.

[0023] In these embodiments, at least a portion of the surface of the collecting mechanism on a side facing away from the pressure relief mechanism is spaced apart from the wall plate, so that a second pressure relief space is formed between the collecting mechanism and the wall plate.

[0024] In the scheme of the embodiment of the present application, the collecting mechanism is arranged on one side away from the pressure relief mechanism and is spaced apart from the wall plate to form a second pressure relief space between the collecting mechanism and the wall plate. By setting the second pressure relief space, after the collecting mechanism is melted through, high-temperature substances can diffuse in the second pressure relief space and be buffered, thereby reducing the risk of high-temperature ejecta burning the box body and improving the reliability of the battery cell.

[0025] In a second aspect, the present application provides an electrical device, comprising the battery device of the embodiment of the first aspect described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] 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. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0027] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application;

[0028] Figure 2 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0029] Figure 3 is a structural schematic diagram of a battery module provided in an embodiment of the application;

[0030] Figure 4 is an exploded view of a battery cell provided in one embodiment of the present application;

[0031] Figure 5 is a schematic structural diagram of a battery device provided in one embodiment of the present application;

[0032] Figure 6 is a schematic structural diagram of a low-voltage structure of a battery device provided in one embodiment of the present application;

[0033] Figure 7 yes Figure 6 Sectional view at AA in the middle;

[0034] Figure 8 is a schematic structural diagram of a battery device provided in another embodiment of the present application;

[0035] Fig. 9 is a structural schematic diagram of an isolation structure of a battery device provided in one embodiment of the present application;

[0036] Fig.10 yes Fig. 9 Sectional view at the middle BB;

[0037] Fig.11 yes Figure 8 Sectional view at CC;

[0038] Fig.12 yes Fig.11 Schematic diagram of the enlarged structure at D in the middle.

[0039] Reference numerals:

[0040] 1. Vehicle; 101. Motor; 102. Controller; 2. Battery device; 201. Battery module; 202. Box; 2021. First box; 2022. Second box;

[0041] 3. Battery cells;

[0042] 4. Shell;

[0043] 5. electrode assembly; 51. pole ear; 52. electrode body;

[0044] 6. End cap assembly; 61. Electrode terminal; 62. Pressure relief mechanism;

[0045] 71. wall plate; 73. first pressure relief space; 74. second pressure relief space; 711. first wall portion; 712. second wall portion; 75. accommodating chamber;

[0046] 8. Collection mechanism; 81. Base; 82. Weakened portion; 83. Cavity wall; 84. Chamber; 85. Adjustment pipeline;

[0047] 9. Isolation mechanism; 91. Main body; 92. Guide channel; 921. First port; 922. Second port; 93. Support member. DETAILED DESCRIPTION

[0048] 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.

[0049] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should have the common meanings understood by technicians in the field to which the embodiments of the present application belong.

[0050] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0051] In addition, the technical terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number 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.

[0052] 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 ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0054] At present, from the perspective of market development, the application of battery devices is becoming more and more extensive. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of the application field of battery devices, the market demand is also constantly expanding.

[0055] Usually, several battery cells are placed in a box to be integrated into a battery device for use. However, there is a risk of thermal runaway during the use of the battery cells. After some battery cells have thermal runaway, they will also cause damage to the normally operating devices around them.

[0056] The reason for the above problem is that when the battery cell thermally runs away, high-temperature ejecta will be ejected from the pressure relief mechanism, causing a surge in pressure inside the box. The box may tear or explode in this case; and the high-temperature ejecta will burn surrounding devices, causing damage to other components or fire, causing the thermal runaway to spread.

[0057] Based on the above problems, an embodiment of the present application provides a battery device, which includes a box body, a battery cell and a collecting mechanism. The box body includes a wall panel and a accommodating chamber surrounded by the wall panel. The battery cell is arranged in the accommodating chamber. The collecting mechanism includes a chamber wall and a chamber surrounded by the chamber wall. The pressure in the chamber is less than the standard atmospheric pressure. The battery cell includes a pressure relief mechanism. The pressure relief mechanism is configured to be actuated to release the temperature or pressure when the internal pressure and temperature of the battery cell exceed a threshold value. By arranging the collecting mechanism between the wall panel and the pressure relief mechanism, when the pressure relief mechanism is actuated, its high-temperature ejecta melts part of the chamber wall, the chamber and the accommodating chamber are connected, and under the action of negative pressure, at least part of the high-temperature material can be collected in the chamber wall, thereby reducing the risk of high-temperature ejecta burning other devices in the accommodating chamber, and the low-pressure environment in the chamber can alleviate the problem of high-temperature ejecta causing the pressure in the accommodating chamber to increase, thereby reducing the risk of the box body bursting and tearing under high pressure, thereby improving the reliability of the battery device.

[0058] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0059] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle 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, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0060] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0061] The battery cell 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 metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application. The battery cell can be cylindrical, flat, rectangular or other shapes, which is not limited in the embodiments of the present application.

[0062] The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application may include a battery module or a battery pack. The battery pack generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0063] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector and a positive electrode ear connected to the positive current collector. The positive current collector is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative current collector and a negative active material layer, and the negative active material layer is coated on the surface of the negative current collector; the negative current collector includes a negative current collector and a negative electrode tab connected to the negative current collector, the negative current collector is coated with the negative active material layer, and the negative electrode tab is not coated with the negative active material layer. The material of the negative current collector can be copper, and the negative active material layer includes a negative active material, and the negative active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc.

[0064] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including a box and electrical equipment using the battery devices. However, for the sake of simplicity, the following embodiments are described using electric vehicles as examples.

[0065] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1 provided for some embodiments of the present application. Vehicle 1 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 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 102 and a motor 101, and the controller 102 is used to control the battery to power the motor 101, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0066] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0067] Figure 2 A schematic structural diagram of a battery device according to an embodiment of the present application is shown.

[0068] The battery device 2 mentioned in the embodiment of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells 3, and the plurality of battery cells 3 are connected in series, in parallel or in mixed connection through a busbar.

[0069] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells 3 .

[0070] As an example, the battery cell assembly may be a battery module 201, and the battery module 201 is formed by arranging and fixing a plurality of battery cells 3 to form an independent module. As an example, the battery module 201 may be formed by bundling a plurality of battery cells 3 by a cable tie.

[0071] In some embodiments, the battery device may be a battery pack, which includes a case 202 and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case 202 .

[0072] As an example, the battery cell assembly may be a battery module 201 , and the battery cell assembly may be accommodated in the box by fixing the battery module 201 in the box.

[0073] As an example, the battery cell assembly may also be accommodated in the box body 202 by directly fixing the plurality of battery cells 3 to the box body 202 .

[0074] As an example, the box 202 may include a first box 2021 and a second box 2022. The first box 2021 and the second box 2022 are buckled together to form a closed space inside the box 202 to accommodate the battery monomer assembly. The closed space here means covering or closing, which can be sealed or unsealed. The first box 2021 can be a top cover or a bottom plate.

[0075] As an example, the box body 202 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body 202 to accommodate the battery cell assembly.

[0076] In some embodiments, the box 202 can be used as a part of the chassis structure of the vehicle. For example, a part of the box 202 can become at least a part of the floor of the vehicle, or a part of the box 202 can become at least a part of the cross beam and the longitudinal beam of the vehicle.

[0077] Figure 3 A schematic structural diagram of a battery module 201 according to an embodiment of the present application is shown.

[0078] In some embodiments, Figure 2 and Figure 3 As shown, there are multiple battery cells 3, and the multiple battery cells 3 are first connected in series, parallel or mixed to form a battery module 201. The multiple battery modules 201 are then connected in series, parallel or mixed to form a whole, and are accommodated in the box 202.

[0079] The multiple battery cells 3 in the battery module 201 can be electrically connected through a busbar component to achieve parallel connection, series connection or mixed connection of the multiple battery cells 3 in the battery module 201 .

[0080] In the present application, the battery cell 3 may include a lithium-ion battery cell, a sodium-ion battery cell, a magnesium-ion battery cell, etc., which is not limited in the embodiments of the present application.

[0081] Figure 4 FIG. 1 is an exploded view of a battery cell provided in an embodiment of the present application. A battery cell 3 refers to the smallest unit constituting a battery. Figure 4 The battery cell 3 includes an end cover assembly 6 , a shell 4 and an electrode assembly 5 .

[0082] The electrode assembly 5 is a component in the battery cell 3 where electrochemical reactions occur. One or more electrode assemblies 5 may be included in the housing 4. The electrode assembly 5 is mainly formed by winding or stacking pole sheets, which are divided into positive pole sheets and negative pole sheets, and a separator is usually provided between the positive pole sheet and the negative pole sheet. The parts of the positive pole sheet and the negative pole sheet with active materials constitute the electrode body 52, and the parts of the positive pole sheet and the negative pole sheet without active materials each constitute the pole ear 51. The positive pole ear and the negative pole ear may be located together at one end of the electrode body 52 or at both ends of the electrode body 52, respectively. During the charge and discharge process of the battery cell 3, the positive active material and the negative active material react with the electrolyte, and the pole ear 51 connects the electrode terminal to form a current loop.

[0083] The electrode assembly 5 may be a winding structure, a laminated structure, or a mixed structure of winding and laminated structures.

[0084] In some embodiments, the electrode assembly 5 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0085] In some embodiments, the electrode assembly 5 is a laminated structure. As an example, a plurality of positive and negative electrodes may be provided, and the plurality of positive and negative electrodes may be alternately stacked, and a plurality of separators may be provided, and each separator may be provided between any adjacent positive or negative electrodes, or the separator may be provided continuously and folded between any adjacent positive or negative electrodes.

[0086] In some embodiments, the shape of the electrode assembly 5 can be cylindrical, flat, or polygonal.

[0087] In some embodiments, the electrode assembly 5 is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0088] The battery cell may include a shell. The shell 4 is a component used to cooperate with the end cap assembly 6 to form an internal environment of the battery cell 3, wherein the formed internal environment can be used to accommodate the electrode assembly 5, the electrolyte (not shown in the figure) and other components. The shell 4 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. In some embodiments, the shell 4 can be a sealed structure or a non-sealed structure. As an example, when the shell 4 is a non-sealed structure, the shell 4 plays a role in protecting the electrode assembly 5, and a sealing bag is also included between the shell 4 and the electrode assembly 5, 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 shell 4 is a sealed structure, it is used to encapsulate components such as the electrode assembly 5 and the electrolyte.

[0089] As an example, the battery cell 3 can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0090] The housing 4 and the end cap assembly 6 may be independent components, and one or more openings may be provided on the housing 4, and one or more end cap assemblies 6 cover the openings to form the internal environment of the battery cell 3. Optionally, the end cap assembly 6 and the housing 4 may be integrated. Optionally, the end cap assembly 6 and the housing 4 may form a common connection surface before other components are placed in the housing, and when the interior of the housing 4 needs to be encapsulated, the end cap assembly 6 covers the housing 4.

[0091] In some embodiments, the electrode terminal 61 may be disposed on the end cap assembly 6 or on the housing 4, and the electrode terminal 61 is electrically connected to the tab 51. The electrode terminal 61 may be directly connected to the tab 51 or indirectly connected to the tab 51 through a switching mechanism.

[0092] See also Figure 5 , Figure 6 and Figure 7 , Figure 5 is a schematic structural diagram of a battery device provided in one embodiment of the present application; Figure 6 is a schematic structural diagram of a low-voltage structure of a battery device provided in one embodiment of the present application; Figure 7 yes Figure 6 Cross-sectional view at AA in the middle.

[0093] First, as Figures 5 to 7 As shown, the present application provides a battery device 2, which includes a box body 202, a battery cell 3 and a collecting mechanism 8. The box body 202 includes a wall plate 71 and a receiving cavity 75 surrounded by the wall plate 71; the battery cell 3 is arranged in the receiving cavity 75, and the battery cell 3 includes a pressure relief mechanism 62; the collecting mechanism 8 is arranged between the wall plate 71 and at least one pressure relief mechanism 62, and the collecting mechanism 8 includes a cavity wall 83 and a cavity 84 surrounded by the cavity wall 83, and the pressure in the cavity 84 is less than the standard atmospheric pressure. The collecting mechanism 8 is configured so that the cavity wall 83 is melted after the pressure relief mechanism 62 is actuated, and the cavity 84 is connected to the receiving cavity 75.

[0094] In the solution of the embodiment of the present application, the battery device 2 includes a box body 202, a battery cell 3 and a collection mechanism 8, the box body 202 includes a wall plate 71 and a receiving cavity 75 surrounded by the wall plate 71, the battery cell 3 is arranged in the receiving cavity 75, the collection mechanism 8 includes a cavity wall 83 and a cavity 84 surrounded by the cavity wall 83, the pressure in the cavity 84 is less than the standard atmospheric pressure, the battery cell 3 includes a pressure relief mechanism 62, and the pressure relief mechanism 62 is configured to be actuated to release the temperature or pressure when the internal pressure and temperature of the battery cell 3 exceed the threshold value, by the collection mechanism 8 is arranged between the wall plate 71 and the pressure relief mechanism 62, so that when the pressure relief mechanism 62 is actuated, its high-temperature ejection melts part of the cavity wall 83, the cavity 84 and the accommodating cavity 75 are connected, and under the action of negative pressure, at least part of the high-temperature material can be collected in the cavity wall 83, thereby reducing the risk of the high-temperature ejection burning other devices in the accommodating cavity 75, and the low-pressure environment in the cavity 84 can alleviate the problem of the high-temperature ejection causing the pressure in the accommodating cavity 75 to increase, thereby reducing the risk of the box body 202 bursting and tearing under the action of high pressure, thereby improving the reliability of the battery device 2.

[0095] The battery cell 3 includes a pressure relief mechanism 62. As an example, the pressure relief mechanism 62 is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 3 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 3 reaches a predetermined threshold, the pressure relief mechanism 62 performs an action or a weak structure provided in the pressure relief mechanism 62 is damaged, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, the negative electrode plate, the electrolyte and the separator in the battery cell 3.

[0096] As an example, the pressure relief mechanism 62 may be integrally formed with the shell 4 , for example, a notch is made on the shell 4 to form a weak structure, and the weak structure serves as the pressure relief mechanism 62 .

[0097] The pressure relief mechanism 62 may also be separately provided and connected to the housing 4, for example, the pressure relief mechanism 62 is welded or connected to the housing 4 through other components. As an example, a notch is provided on the pressure relief mechanism 62 to form a weak structure.

[0098] As an example, the pressure relief mechanism 62 may be in the form of an explosion-proof valve, a balancing valve, an air valve, a pressure relief valve, or a safety valve.

[0099] The "actuation" mentioned in this application means that the pressure relief mechanism 62 is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 3 can be released. The action produced by the pressure relief mechanism 62 may include but is not limited to: the components in the pressure relief mechanism 62 move to form an exhaust channel, at least a part of the pressure relief mechanism 62 ruptures, breaks, is torn or opened, and so on. When the pressure relief mechanism 62 is actuated, the high-temperature and high-pressure substances inside the battery cell 3 will be discharged from the actuated part as emissions. In this way, the battery cell 3 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0100] The emissions from the battery cells 3 mentioned in the present application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the isolation membrane, high-temperature and high-pressure gas generated by the reaction, flames, and the like.

[0101] Optionally, the battery cell 3 includes a shell 4 and an end cover assembly 6, and the pressure relief mechanism 62 can be arranged on at least one of the shell 4 and the end cover assembly 6, that is, the pressure relief mechanism 62 can be oriented in any direction according to actual conditions. For the convenience of expression, the pressure relief mechanism 62 is arranged on the end cover assembly 6 in the drawings of the present application.

[0102] The collecting mechanism 8 includes a cavity wall 83 and a cavity 84 enclosed by the cavity wall 83. When the battery cell 3 thermally runs away, part of the cavity wall 83 comes into contact with the high-temperature ejecta. The temperature of this part of the cavity wall 83 rises and gradually melts, causing the cavity 84 to be connected with the accommodating cavity 75. The pressure in the cavity 84 is lower than the standard atmospheric pressure. Specifically, the pressure in the cavity 84 is set to be lower than the internal pressure of the accommodating cavity 75. When the cavity 84 and the accommodating cavity 75 are connected, the material in the accommodating cavity 75 will be sucked into the cavity 84 under the action of negative pressure.

[0103] It should be clear that after the high-temperature ejecta enters the chamber 84, it collides and diffuses in the chamber 84, and its temperature is gradually conducted and reduced, resulting in the high-temperature ejecta being unable to burn through the chamber wall 83 again after entering the chamber 84, or the high-temperature ejecta burning through the chamber wall 83 again. Its temperature is also reduced, which reduces the risk of high-temperature ejecta burning other components.

[0104] Optionally, the cavity wall 83 may be made of metal or non-metal. The user may adjust the material and thickness of the cavity wall 83 according to the actual temperature of the high-temperature ejecta. For example, the cavity wall 83 may be made of aluminum alloy or polyphenylene sulfide.

[0105] Optionally, a vacuum environment is set in the chamber 84 to enhance the pressure difference between the chamber 84 and the receiving chamber 75, so that when the chamber wall 83 melts and the chamber 84 and the receiving chamber 75 are connected, the high-temperature ejecta is quickly sucked into the chamber 84.

[0106] Optionally, the shape of the low-pressure structure is the same as the cross-sectional shape of the box body 202 to reduce the risk of leakage of high-temperature ejecta from the edge between the collecting mechanism 8 and the box body 202. Exemplarily, the box body 202 is in a cubic shape and the collecting mechanism 8 is in a rectangular shape.

[0107] Optionally, a plurality of battery cells 3 are arranged in the box body 202, and the pressure relief mechanisms 62 and collecting mechanisms 8 of at least two battery cells 3 are arranged opposite to each other. Exemplarily, the pressure relief mechanisms 62 of all battery cells 3 in the box body 202 are arranged opposite to one collecting mechanism 8, thereby reducing the difficulty of setting up the collecting mechanism 8; or a plurality of collecting mechanisms 8 are arranged in the box body 202, and each pressure relief mechanism 62 and each collecting mechanism 8 are arranged in a one-to-one correspondence, thereby reducing the processing cost of the collecting mechanism 8.

[0108] Optionally, the collecting mechanism 8 and the wall plate 71 of the box body 202 are welded, riveted, or bolted, so that the collecting mechanism 8 remains stable in the accommodating cavity 75 .

[0109] Optionally, the collecting mechanism 8 is made of insulating material, or an insulating layer is provided on the outer surface of the collecting mechanism 8 to improve the insulation reliability between the collecting mechanism 8 and the battery cell 3 .

[0110] Optionally, a support portion is provided in the chamber 84 to support the chamber wall 83 so as to improve the problem that the collecting mechanism 8 is easily deformed under the action of the internal and external pressure difference.

[0111] Optionally, the collecting mechanism 8 is further provided with a regulating pipeline 85 , which is connected to the chamber 84 , and an external device regulates the pressure in the chamber 84 through the regulating pipeline 85 .

[0112] It should be made clear that Figure 5 In the embodiment, only one row of battery cells 3 is arranged in the accommodating cavity 75, but in actual use, multiple rows of battery cells 3 can be designed according to the use situation.

[0113] In some embodiments, Figure 5 and Figure 6 As shown, the cavity wall 83 includes a base 81 and a weakened portion 82 that are interconnected. The melting point of the weakened portion 82 is lower than the melting point of the base 81, and / or the structural strength of the weakened portion 82 is lower than the structural strength of the base 81. The weakened portion 82 and at least one pressure relief mechanism 62 are arranged opposite to each other.

[0114] In these embodiments, the weakened portion 82 and at least one pressure relief mechanism 62 are arranged opposite to each other so that the high-temperature ejecta can destroy the cavity wall 83 more quickly and be collected in the cavity 84 more quickly, thereby improving the reliability of the battery device 2.

[0115] The weakened portion 82 is arranged on one side surface of the collecting mechanism 8 facing the pressure relief mechanism 62. The weakened portion 82 and at least one pressure relief mechanism 62 are arranged opposite to each other so that the high-temperature material is ejected from the pressure relief mechanism 62 and contacts the weakened portion 82. The weakened portion 82 is quickly melted or destroyed by the impact force of the high-temperature ejected material. The high-temperature ejected material is quickly collected into the chamber 84. The base 81 has a high melting point or structural strength, so that the high-temperature ejected material in the chamber 84 is not easy to melt through or break through the chamber wall 83 and leak.

[0116] Optionally, multiple battery cells 3 are arranged in the box body 202, that is, multiple pressure relief mechanisms 62 are included, the weakened portion 82 extends continuously, and the weakened portion 82 and at least two pressure relief mechanisms 62 are arranged opposite to each other to reduce the difficulty of setting the weakened portion 82; or multiple weakened portions 82 are arranged at intervals on the cavity wall 83, and each pressure relief mechanism 62 and each weakened portion 82 are arranged one by one to enhance the structural strength of the collection mechanism 8. Optionally, the shape of the weakened portion 82 can be designed by itself, and for example, the weakened portion 82 is circular or rectangular.

[0117] Optionally, the weakened portion 82 and the base 81 are integrally formed, and the thickness of the weakened portion 82 is lower than that of the base 81, so that the melting point or structural strength of the weakened portion 82 is lower than that of the base 81; or the weakened portion 82 and the base 81 are prepared separately, the melting point or structural strength of the material of the weakened portion 82 is lower than that of the material of the base 81, and the base 81 is provided with a through hole, and the weakened portion 82 covers the through hole.

[0118] Optionally, the inner surface of the cavity wall 83 facing the cavity 84 is provided with a boss extending continuously around the weakened portion 82, and the boss is used to prevent the high-temperature material in the cavity 84 from leaking to the accommodating cavity 75 through the weakened portion 82 again. The height of the boss can be designed by oneself.

[0119] In some embodiments, Figures 5 to 7 As shown, the collecting mechanism 8 also includes a fire-fighting medium (not shown), which is contained in the chamber 84 .

[0120] In these embodiments, a firefighting medium is provided in the chamber 84 to reduce the temperature of the high-temperature ejected matter entering the chamber 84 .

[0121] A firefighting medium is provided in the chamber 84 so that when the high-temperature ejecta is collected in the chamber 84 , the firefighting medium helps to reduce the temperature of the high-temperature ejecta, thereby reducing the risk of the high-temperature ejecta melting the chamber wall 83 again.

[0122] Optionally, the fire-fighting medium should not corrode the cavity wall 83 and other devices in the accommodating cavity 75. The specific type and quality of the fire-fighting medium can be designed according to actual conditions. For example, the fire-fighting medium can be sodium bicarbonate dry powder, air foam, chemical foam, etc.

[0123] See also Figure 8 , Fig. 9 and Fig.10 , Figure 8 is a schematic structural diagram of a battery device provided in another embodiment of the present application; Fig. 9 is a structural schematic diagram of an isolation structure of a battery device provided in one embodiment of the present application; Fig.10 yes Fig. 9 Cross-sectional view at the middle BB.

[0124] In some embodiments, Figures 8 to 10 As shown, the battery device 2 also includes an isolation mechanism 9, which is arranged between the collection mechanism 8 and the battery cell 3. The isolation mechanism 9 includes a main body 91 and at least one guide channel 92 running through the main body 91. The guide channel 92 includes a first port 921 and a second port 922 that are relatively arranged. The first port 921 is arranged toward at least one pressure relief mechanism 62, and the second port 922 is arranged toward the collection mechanism 8.

[0125] In these embodiments, the battery device 2 also includes an isolation mechanism 9 arranged between the collecting mechanism 8 and the battery cell 3, the isolation mechanism 9 includes a guide channel 92, the first port 921 of the guide channel 92 is arranged toward the pressure relief mechanism 62, and the second port 922 of the guide channel 92 is arranged toward the collecting mechanism 8. The high-temperature ejecta of the pressure relief mechanism 62 is guided through the guide channel 92 to melt the cavity wall 83, thereby reducing the risk of the high-temperature ejecta diffusing and ablating other components in the box body 202, thereby improving the reliability of the battery device 2.

[0126] Optionally, the shape of the isolation mechanism 9 is the same as the cross-sectional shape of the box body 202 to reduce the risk of high-temperature ejecta leaking from the edge between the isolation mechanism 9 and the box body 202. Exemplarily, the box body 202 is in a cubic shape and the isolation mechanism 9 is in a rectangular shape.

[0127] Exemplarily, the isolation mechanism 9 is in the shape of a plate, and a plurality of guide channels 92 are provided through the plate-shaped isolation mechanism 9 , and each guide channel 92 is provided in a one-to-one correspondence with each pressure relief mechanism 62 .

[0128] Optionally, the isolation mechanism 9 is made of a high temperature resistant material. Exemplarily, the isolation mechanism 9 is made of a metal material or polyphenylene sulfide, polyimide, aramid fiber, or the like.

[0129] Optionally, the isolation mechanism 9 has a certain deformation capability to adapt to the expansion of the shape of the battery cell 3 when the battery cell 3 is in thermal runaway, thereby reducing the risk of the isolation mechanism 9 and the battery cell 3 being squeezed and damaged by each other.

[0130] Optionally, the cross-sectional area of ​​the guide channel 92 gradually increases from the second port 922 to the first port 921, so that the guide channel 92 can better gather the high-temperature ejecta and improve the problem of high-temperature ejecta diffusion. The shapes of the first port 921 and the second port 922 can be designed by yourself.

[0131] Optionally, the guide channel 92 is in the shape of a straight tube extending along the thickness of the isolation mechanism 9 to reduce the difficulty of setting the guide channel 92 .

[0132] Optionally, the isolation mechanism 9 is made of an insulating material, or an insulating layer is provided on the outer surface of the isolation mechanism 9 to improve the insulation reliability between the collection mechanism 8 and the battery cell 3 .

[0133] Optionally, the isolation mechanism 9 and the wall plate 71 of the box body 202 are welded, riveted, or bolted, so that the isolation mechanism 9 remains stable in the accommodating cavity 75.

[0134] Optionally, the isolation mechanism 9 and the wall plate 71 of the box body 202 are sealed and connected to reduce the risk of high-temperature substances leaking from the edges of the isolation mechanism 9 and the wall plate 71 .

[0135] See also Fig.11 , Fig.11 yes Figure 8 Cross-sectional view at CC.

[0136] In some embodiments, Figure 6 , Figures 8 to 11 As shown, the cavity wall 83 includes a base 81 and a weakened portion 82 that are interconnected, the melting point of the weakened portion 82 is lower than the melting point of the base 81, and / or the structural strength of the weakened portion 82 is lower than the structural strength of the base 81, and the second port 922 is arranged toward at least one weakened portion 82.

[0137] In these embodiments, the high-temperature ejecta of the pressure relief mechanism 62 are guided to the weakened portion 82 via the guide channel 92 , and the guide channel 92 serves to guide and gather the high-temperature substances so that the weakened portion 82 is destroyed faster, thereby improving the reliability of the battery device 2 .

[0138] Optionally, the orthographic projection of the second port 922 on the cavity wall 83 is located inside the weakened portion 82 , so that the high-temperature material ejected from the second port 922 can melt the weakened portion 82 more quickly.

[0139] Optionally, each second port 922 and each weakened portion 82 is arranged in one-to-one correspondence.

[0140] In some embodiments, Figures 8 to 11 As shown, at least part of the isolation mechanism 9 is connected to the battery cell 3 , and at least one pressure relief mechanism 62 is located in the first port 921 .

[0141] In these embodiments, at least one pressure relief mechanism 62 is located at the first port 921 , which improves the problem of high-temperature ejecta ejected from the pressure relief mechanism 62 escaping outside the pressure relief channel and ablating other components in the housing 202 , thereby improving the reliability of the battery device 2 .

[0142] Specifically, at least part of the guide channel 92 extends toward the pressure relief mechanism 62 and contacts the battery cell 3 , and the positive projection of the guide channel 92 on the battery cell 3 covers the pressure relief mechanism 62 , so that the high-temperature material sprayed from the pressure relief mechanism 62 is gathered into the guide channel 92 .

[0143] Optionally, an insulating colloid is provided on the periphery of the pressure relief mechanism 62 , and the battery cell 3 and the isolation mechanism 9 are bonded together by the insulating colloid to keep the isolation mechanism 9 and the battery cell 3 relatively fixed.

[0144] See also Fig.12 , Fig.12 yes Fig.11 Schematic diagram of the enlarged structure at D in the middle.

[0145] In some embodiments, Figure 8 and Fig.12As shown, the collecting mechanism 8 and at least a portion of the isolating mechanism 9 are spaced apart from each other so that a first pressure relief space 73 is formed between the collecting mechanism 8 and the isolating mechanism 9 .

[0146] In these embodiments, a first pressure relief space 73 is formed between the collecting mechanism 8 and the isolating mechanism 9 to release the internal pressure of the battery cell 3 during the process of the high-temperature ejecta melting the cavity wall 83 , thereby reducing the degree of thermal runaway of the battery cell 3 and improving the reliability of the battery device 2 .

[0147] When the battery cell 3 is in thermal runaway, the isolation mechanism 9 may be deformed, so the first pressure relief space 73 is provided to buffer the deformation of the collection mechanism 8 and reduce the risk of compression damage of the collection mechanism 8 and the isolation mechanism 9 .

[0148] Along the thickness direction of the isolation mechanism 9 , at least part of the collecting mechanism 8 and at least part of the isolation mechanism 9 are arranged at intervals to form a first pressure relief space 73 .

[0149] Optionally, the shape and volume of the first pressure relief space 73 can be designed by oneself. For example, the height of the first pressure relief space 73 is 1 mm, 2 mm or 3 mm.

[0150] Optionally, the battery device 2 also includes an electrical connection structure, and at least two battery cells 3 are connected in parallel or in series through the electrical connection structure. The electrical connection structure is arranged between the pressure relief mechanism 62 and the isolation mechanism 9. The electrical connection structure and the pressure relief mechanism 62 are separated by the isolation mechanism 9 to reduce the risk of high-temperature ejecta burning the electrical connection structure during thermal runaway of the battery cell 3, causing the electrical connection structure to melt and catch fire, thereby improving the reliability of the battery device 2.

[0151] In some embodiments, Figure 8 , Fig. 9 and Fig.12 As shown, the isolation mechanism 9 further includes a support member 93 , at least two support members 93 are spaced apart and arranged on a side of the body 91 facing the collection mechanism 8 , and the support member 93 is connected to the collection mechanism 8 .

[0152] In these embodiments, the isolation mechanism 9 also includes a support member 93, at least two support members 93 are spaced apart on the side of the main body 91 facing the collecting mechanism 8, and the support member 93 is connected to the collecting mechanism 8 so that the support member 93 plays a role in supporting and fixing the collecting mechanism 8, thereby improving the reliability of the battery device 2.

[0153] Exemplarily, a plurality of support members 93 are arranged in rows and columns at intervals on a side of the body 91 facing the collecting mechanism 8 to support the collecting mechanism 8 .

[0154] Optionally, the support member 93 has elasticity in its extension direction to reduce the risk of damaging the collecting mechanism 8 during the deformation of the isolation mechanism 9.

[0155] Optionally, a plurality of support members 93 are spaced apart from each other and disposed in the first pressure relief space 73 .

[0156] Optionally, the support member 93 and the body 91 are integrally formed to enhance the overall structural strength of the isolation mechanism 9 .

[0157] Optionally, the support member 93 and the weakened portion 82 are spaced apart to reduce the risk of the weakened portion 82 being squeezed and damaged by the support member 93 .

[0158] Optionally, the support member 93 and the collecting mechanism 8 are connected by bonding or snapping to improve the connection reliability between the support member 93 and the collecting mechanism 8; or the support member 93 and the collecting mechanism 8 are connected by abutment to reduce the difficulty of matching the support member 93 and the collecting mechanism 8.

[0159] In some embodiments, Figure 8 , Fig.11 and Fig.12 As shown, the wall panel 71 includes a first wall portion 711 and a second wall portion 712, the second wall portion 712 encloses a accommodating space including an opening, the battery cell 3 is arranged in the accommodating space, the first wall portion 711 covers the opening to form a accommodating cavity 75, wherein the pressure relief mechanism 62 is arranged at one end of the battery cell 3 facing the first wall portion 711, and the first wall portion 711 is connected to the collecting mechanism 8.

[0160] In these embodiments, the pressure relief mechanism 62 is arranged at one end of the battery cell 3 facing the first wall portion 711, and the collecting mechanism 8 is arranged between the pressure relief mechanism 62 and the first wall portion 711. The first wall portion 711 and the collecting mechanism 8 are connected, which not only reduces the difficulty of matching the collecting mechanism 8 and the box body 202, but also helps to fix the position of the collecting mechanism 8, reduces the risk of the collecting mechanism 8 moving in the box body 202, and improves the reliability of the battery device 2.

[0161] Specifically, the collecting mechanism 8 is disposed between the pressure relief mechanism 62 and the first wall portion 711 . When the first wall portion 711 is locked to the second wall portion 712 , the first wall portion 711 is also connected to the collecting mechanism 8 to fix the position of the collecting mechanism 8 in the accommodating chamber 75 .

[0162] Optionally, the first wall portion 711 presses the collecting mechanism 8 toward the isolating mechanism 9 , and the collecting mechanism 8 is squeezed between the supporting member 93 and the first wall portion 711 , so that the collecting mechanism 8 can be better maintained stable in the accommodating cavity 75 .

[0163] Optionally, the collecting mechanism 8 and the second wall portion 712 are connected by riveting, bolting or clamping to improve the connection reliability between the collecting mechanism 8 and the box body 202.

[0164] Optionally, a buckle and a slot are respectively provided on a side of the collecting mechanism 8 facing the first wall portion 711 and a side surface of the first wall portion 711 facing the accommodating cavity 75 to improve the connection reliability between the collecting mechanism 8 and the first wall portion 711 .

[0165] In some embodiments, Fig.11 and Fig.12 As shown, at least a portion of the surface of the collecting mechanism 8 on the side facing away from the pressure relief mechanism 62 is spaced apart from the wall plate 71 , so that a second pressure relief space 74 is formed between the collecting mechanism 8 and the wall plate 71 .

[0166] In these embodiments, the collecting mechanism 8 is spaced apart from the side of the pressure relief mechanism 62 and the wall plate 71 to form a second pressure relief space 74 between the collecting mechanism 8 and the wall plate 71. By setting the second pressure relief space 74, after the collecting mechanism 8 is melted through, high-temperature substances can diffuse in the second pressure relief space 74 and be buffered, thereby reducing the risk of high-temperature ejecta burning the box body 202 and improving the reliability of the battery cell 3.

[0167] After the high-temperature ejecta enters the chamber 84 , the collecting mechanism 8 may be deformed, so the second pressure relief space 74 is provided to buffer the deformation of the collecting mechanism 8 and reduce the risk of compression damage to the collecting mechanism 8 and the box body 202 .

[0168] Optionally, the shape and volume of the second pressure relief space 74 can be designed independently.

[0169] Exemplarily, the second pressure relief space 74 is located between the collecting mechanism 8 and at least a portion of the first box body 2021 .

[0170] In a second aspect, the present application provides an electrical device, comprising the battery device of the embodiment of the first aspect described above.

[0171] In some embodiments, Figures 1 to 12As shown, the battery device 2 includes a box body 202, a battery cell 3, a collecting mechanism 8 and an isolating mechanism 9. The box body 202 includes a wall plate 71 and a receiving cavity 75 surrounded by the wall plate 71. The wall plate 71 includes a first wall portion 711 and a second wall portion 712. The second wall portion 712 encloses a receiving space including an opening. The battery cell 3 is arranged in the receiving space. The first wall portion 711 covers the opening to form the receiving cavity 75. The battery cell 3 includes a pressure relief mechanism 62. The pressure relief mechanism 62 is arranged at the battery cell 3 toward the first The collecting mechanism 8 is disposed between the first wall portion 711 and the pressure relief mechanism 62 and connected to the first wall portion 711. The isolating mechanism 9 is disposed between the collecting mechanism 8 and the battery cell 3. The collecting mechanism 8 includes a cavity wall 83 and a cavity 84 surrounded by the cavity wall 83. The firefighting medium is contained in the cavity 84. The cavity wall 83 includes a base portion 81 and a weakened portion 82 connected to each other. The melting point of the weakened portion 82 is lower than the melting point of the base portion 81, and / or the structural strength of the weakened portion 82 is lower than the structural strength of the base portion 81. strength, the isolation mechanism 9 includes a main body 91 and at least one guide channel 92 running through the main body 91, the guide channel 92 includes a first port 921 and a second port 922 arranged opposite to each other, the pressure relief mechanism 62 is located in the first port 921, and the second port 922 is arranged toward at least one weakened portion 82, the pressure in the chamber 84 is less than the standard atmospheric pressure, the collecting mechanism 8 is configured so that the cavity wall 83 is melted after the pressure relief mechanism 62 is actuated, the chamber 84 is connected to the accommodating chamber 75, the isolation mechanism 9 also includes a support member 93, at least two support members 93 are spaced apart on the side of the main body 91 facing the collecting mechanism 8, the support member 93 is connected to the collecting mechanism 8, the collecting mechanism 8 and at least part of the isolation mechanism 9 are spaced apart so that a first pressure relief space 73 is formed between the collecting mechanism 8 and the isolation mechanism 9, the first box body 2021 presses the collecting mechanism 8 toward the battery cell 3, and the collecting mechanism 8 is spaced apart from the side of the pressure relief mechanism 62 and the first wall portion 711 so that a second pressure relief space 74 is formed between the collecting mechanism 8 and the first wall portion 711.

[0172] In these embodiments, the battery device 2 includes a box body 202, a battery cell 3, and a collection mechanism 8. The box body 202 includes a wall plate 71 and a receiving cavity 75 surrounded by the wall plate 71. The battery cell 3 is disposed in the receiving cavity 75. The collection mechanism 8 includes a cavity wall 83 and a cavity 84 surrounded by the cavity wall 83. The pressure in the cavity 84 is less than the standard atmospheric pressure. The battery cell 3 includes a pressure relief mechanism 62. The pressure relief mechanism 62 is configured to be actuated to release the temperature or pressure when the internal pressure and temperature of the battery cell 3 exceed a threshold value. By It is arranged between the wall plate 71 and the pressure relief mechanism 62, so that when the pressure relief mechanism 62 is actuated, its high-temperature ejecta melts part of the cavity wall 83, and the cavity 84 and the accommodating cavity 75 are connected. Under the action of negative pressure, at least part of the high-temperature material can be collected in the cavity wall 83, reducing the risk of the high-temperature ejecta burning other devices in the accommodating cavity 75, and the low-pressure environment in the cavity 84 can alleviate the problem of the high-temperature ejecta causing the pressure in the accommodating cavity 75 to increase, so as to reduce the risk of the box body 202 bursting and tearing under the action of high pressure, thereby improving the reliability of the battery device 2.

[0173] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein 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 claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery device, characterized in that: include: The box body comprises a wall panel and a receiving cavity enclosed by the wall panel; A battery cell is disposed in the accommodating cavity, and the battery cell includes a pressure relief mechanism; A collecting mechanism is arranged between the wall plate and at least one of the pressure relief mechanisms, the collecting mechanism includes a cavity wall and a cavity enclosed by the cavity wall, the pressure in the cavity is less than the standard atmospheric pressure, the collecting mechanism is configured so that the cavity wall is melted after the pressure relief mechanism is actuated, and the cavity is connected to the accommodating cavity.

2. The battery device according to claim 1, characterized in that: The cavity wall includes a base and a weakened portion that are interconnected, the melting point of the weakened portion is lower than that of the base, and / or the structural strength of the weakened portion is lower than that of the base, and the weakened portion and at least one of the pressure relief mechanisms are arranged opposite to each other.

3. The battery device according to claim 1, characterized in that: The battery device further comprises an isolation mechanism, wherein the isolation mechanism is arranged between the collecting mechanism and the battery cell. The isolation mechanism includes a body and at least one guide channel running through the body, the guide channel includes a first port and a second port arranged opposite to each other, the first port is arranged toward at least one of the pressure relief mechanisms, and the second port is arranged toward the collection mechanism.

4. The battery device according to claim 3, characterized in that: The cavity wall includes a base and a weakened portion connected to each other, the melting point of the weakened portion is lower than that of the base, and / or the structural strength of the weakened portion is lower than that of the base, and the second port is arranged toward at least one of the weakened portions.

5. The battery device according to claim 3, characterized in that: At least part of the isolation mechanism is connected to the battery cell, and at least one of the pressure relief mechanisms is located in the first port.

6. The battery device according to claim 3, characterized in that: The collecting mechanism and at least a portion of the isolating mechanism are spaced apart from each other so that a first pressure relief space is formed between the collecting mechanism and the isolating mechanism.

7. The battery device according to claim 6, characterized in that: The isolation mechanism further includes a support member, at least two of which are spaced apart and arranged on a side of the body facing the collection mechanism, and the support member is connected to the collection mechanism.

8. The battery device according to claim 7, characterized in that: The wall plate includes a first wall portion and a second wall portion, the second wall portion encloses a receiving space including an opening, the battery cell is arranged in the receiving space, and the first wall portion covers the opening to form the receiving cavity. The pressure relief mechanism is arranged at one end of the battery cell facing the first wall portion, and the first wall portion is connected to the collecting mechanism.

9. The battery device according to claim 1, characterized in that: The collecting mechanism further includes a firefighting medium contained in the chamber.

10. The battery device according to claim 1, characterized in that: At least a portion of the surface of the collecting mechanism on a side away from the pressure relief mechanism is spaced apart from the wall plate, so that a second pressure relief space is formed between the collecting mechanism and the wall plate.

11. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 10.

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