Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, the battery device comprises a battery monomer, a box body, a second pressure relief mechanism and a collecting piece, the battery monomer is provided with a first pressure relief mechanism, the box body is provided with a containing cavity, the battery monomer is contained in the containing cavity, the box body is provided with an exhaust channel, and the exhaust channel is communicated with the containing cavity; a wall portion of the exhaust passage has at least one first opening. The second pressure relief mechanism is arranged in the box body, and the exhaust channel is configured to guide emissions discharged by the first pressure relief mechanism to the second pressure relief mechanism so as to be discharged out of the box body. The collecting piece is arranged outside the exhaust channel, the collecting piece is provided with a collecting cavity, and the collecting cavity communicates with the exhaust channel through at least one first opening and is used for collecting emissions. According to the battery device provided by the invention, the risk that the exhaust passage is blocked due to the fact that part of particles in emissions settle and remain in the exhaust passage is reduced.

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

[0003] In the development of battery device technology, in addition to improving the performance of battery devices, the reliability of battery devices is also an issue that needs to be considered. Therefore, how to improve the reliability of battery devices is an issue of continuous improvement in battery device technology. Utility Model Content

[0004] The present application provides a battery device and an electrical device to improve the reliability of the battery device.

[0005] This application is achieved through the following technical solutions:

[0006] In the first aspect, the battery device provided by the embodiment of the present application includes a battery cell, a housing, a second pressure relief mechanism and a collecting piece, the battery cell has a first pressure relief mechanism, the housing has a receiving chamber, the battery cell is received in the receiving chamber, the housing has an exhaust passage, the exhaust passage is connected to the receiving chamber, and the wall of the exhaust passage has at least one first opening. The second pressure relief mechanism is provided in the housing, and the exhaust passage is configured to guide the emissions discharged by the first pressure relief mechanism to the second pressure relief mechanism to be discharged from the housing. The collecting piece is provided outside the exhaust passage, and the collecting piece has a collecting chamber, which is connected to the exhaust passage through at least one first opening and is used to collect at least part of the emissions.

[0007] The battery device provided in the embodiment of the present application is provided with a collecting piece, and the collecting chamber of the collecting piece is connected to the exhaust channel through the first opening. In the case of thermal runaway of the battery device, some particles and liquids in the exhaust can be collected by the collecting chamber of the collecting piece, which is beneficial to reducing the risk of some particles in the exhaust being settled and retained in the exhaust channel and causing the exhaust channel to be blocked, and is beneficial to improving the exhaust smoothness of the battery device in the case of thermal runaway, reducing the risk of excessive internal air pressure of the battery device, and thereby improving the reliability of the battery device.

[0008] According to some embodiments of the present application, the collecting member cover is disposed on the outside of the box body and covers at least one first opening, and the collecting member and the box body are surrounded to form a collecting cavity.

[0009] In the above scheme, the collecting member and the box body are arranged to form a collecting cavity, which not only achieves the purpose of collecting particles in the emissions by the collecting member, but also helps to simplify the structure of the collecting member and reduce the overall weight of the battery device.

[0010] According to some embodiments of the present application, the collecting member is arranged to cover a first opening.

[0011] In the above scheme, the collecting chamber of the collecting member is connected to the exhaust channel through a first opening, so that after the emissions in the exhaust channel enter the collecting chamber, they all collide with the wall of the collecting chamber, generating a greater impact force on the wall of the collecting chamber, so that more particles in the emissions remain in the collecting chamber, thereby further reducing the risk of particles in the emissions clogging the exhaust channel.

[0012] According to some embodiments of the present application, the collecting member covers at least two first openings that are spaced apart from each other.

[0013] In the above scheme, after the emissions in the exhaust channel enter the collecting chamber, the flow in the collecting chamber is smoother. After the emissions return to the exhaust channel again through other first openings, the impact on the airflow in the exhaust channel is smaller, which reduces the interference with the flow of emissions in the exhaust channel, and is further beneficial to improving the smoothness of the emission of emissions in the exhaust channel.

[0014] According to some embodiments of the present application, the collecting member includes a pipeline having a collecting cavity, and each end of the pipeline has a second opening, and the two second openings are respectively connected one by one with two first openings arranged at intervals.

[0015] In the above scheme, the collecting member includes a pipeline, and second openings at both ends of the pipeline are respectively connected to the first opening, which is conducive to simplifying the structure of the collecting member and facilitating the flexible setting of the position of the pipeline. In addition, when the exhaust gas flows through the pipeline, the exhaust gas will flow more smoothly in the pipeline, which is further conducive to improving the exhaust smoothness in the case of thermal runaway of the battery device.

[0016] According to some embodiments of the present application, the exhaust channel includes a first flow channel and a second flow channel that are adjacently arranged, and the extension direction of the first flow channel intersects with the extension direction of the second flow channel. Along the extension direction of the exhaust channel, the first flow channel is arranged on a side of the second flow channel that is away from the second pressure relief mechanism, and at least one first opening includes a corner opening, which is arranged at an end of the first flow channel close to the second flow channel and is arranged opposite to the extension direction of the first flow channel.

[0017] In the above scheme, by setting the first opening to include a corner opening, and setting the collecting chamber of the collecting piece to be connected to the corner opening, when the path of the exhaust channel changes, the emissions can collide with the inner wall of the collecting piece without having to collide with the inner wall of the exhaust channel, which is beneficial to increasing the amount of particles collected in the collecting chamber and reducing the collision of the emissions with the inner wall of the exhaust channel, further reducing the risk of particle accumulation in the exhaust channel and causing exhaust channel blockage, which is beneficial to improving the exhaust smoothness in the event of thermal runaway of the battery device.

[0018] According to some embodiments of the present application, the collecting chamber is communicated with the exhaust channel through a first opening, and the first opening communicated with the collecting chamber is a corner opening.

[0019] In the above scheme, the collecting chamber is connected to the exhaust channel only through the corner opening, which is beneficial to increase the impact force of the exhaust gas with the inner wall of the collecting chamber after entering the collecting chamber, which is beneficial to increase the amount of particles retained in the collecting chamber and improve the ability of the collecting member to collect particles.

[0020] According to some embodiments of the present application, the collecting chamber is connected to the exhaust channel through two first openings. One of the two first openings is a corner opening, or both first openings are corner openings.

[0021] In the above scheme, the collecting chamber is connected to the two first openings, and at least one of the two first openings is a corner opening, which is beneficial to improving the smoothness of discharging emissions in the event of thermal runaway of the battery device, while also helping to increase the amount of particles collected by the collecting chamber, further reducing the risk of the exhaust passage being blocked.

[0022] According to some embodiments of the present application, the box body includes a frame, the frame is arranged to form a containing cavity, and at least a portion of the exhaust passage is arranged in the frame.

[0023] In the above solution, the exhaust channel can be provided by utilizing the frame, which is helpful to simplify the structure of the box without affecting the structural strength of the box, thereby reducing the production cost of the battery device.

[0024] According to some embodiments of the present application, the material of the negative electrode sheet of the battery cell includes graphite, the material of the positive electrode sheet of the battery cell includes lithium iron phosphate material, and the volume of the collection chamber is V1, V1≥0.05L.

[0025] In the above scheme, for a battery cell in which the negative electrode material includes graphite and the positive electrode material includes lithium iron phosphate, setting the volume V1 of the collection chamber to ≥ 0.05L is helpful to further reduce the risk of the exhaust channel being blocked.

[0026] According to some embodiments of the present application, V1≥0.1L.

[0027] In the above solution, for a battery cell in which the negative electrode material includes graphite and the positive electrode material includes lithium iron phosphate, setting V1≥0.1L is helpful to further reduce the risk of the exhaust passage being blocked.

[0028] According to some embodiments of the present application, the material of the negative electrode sheet of the battery cell includes silicon, the material of the positive electrode sheet of the battery cell includes lithium iron phosphate material, and the volume of the collection chamber is V1, V1≥0.08L.

[0029] In the above scheme, for a battery cell in which the negative electrode material includes graphite and silicon and the positive electrode material includes lithium iron phosphate material, setting the volume V1 of the collection chamber ≥ 0.08L is helpful to further reduce the risk of the exhaust channel being blocked.

[0030] According to some embodiments of the present application, V1≥0.15L.

[0031] In the above scheme, for a battery cell in which the negative electrode material includes graphite and silicon and the positive electrode material includes lithium iron phosphate material, setting V1≥0.15L is helpful to further reduce the risk of the exhaust passage being blocked.

[0032] According to some embodiments of the present application, the material of the negative electrode sheet of the battery cell includes graphite, the material of the negative electrode sheet of the battery cell includes a ternary material, and the volume of the collection chamber is V1, V1≥0.1L.

[0033] In the above scheme, for a battery cell in which the negative electrode material includes graphite and the positive electrode material includes a ternary material, setting the volume V1 of the collection chamber to ≥ 0.1L is helpful to further reduce the risk of the exhaust channel being blocked.

[0034] According to some embodiments of the present application, V1≥0.2L.

[0035] In the above scheme, for a battery cell in which the negative electrode material includes graphite and the positive electrode material includes a ternary material, setting V1≥0.2L is helpful to further reduce the risk of the exhaust passage being blocked.

[0036] According to some embodiments of the present application, the material of the negative electrode sheet of the battery cell includes silicon, the material of the positive electrode sheet of the battery cell includes a ternary material, and the volume of the collection chamber is V1, V1≥0.2L.

[0037] In the above scheme, for a battery cell in which the negative electrode material includes graphite and silicon and the positive electrode material includes a ternary material, setting the volume V1 of the collection chamber to ≥ 0.2L is helpful to further reduce the risk of the exhaust channel being blocked.

[0038] According to some embodiments of the present application, V1≥0.3L.

[0039] In the above scheme, for a battery cell in which the negative electrode material includes graphite and silicon and the positive electrode material includes a ternary material, setting V1≥0.3L is helpful to further reduce the risk of the exhaust passage being blocked.

[0040] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in any of the above embodiments.

[0041] The electric device provided in the embodiment of the present application has the same technical effect as the battery device provided in the above embodiment, and thus will not be described in detail here.

[0042] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0045] Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0046] Figure 3 A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application;

[0047] Figure 4 A top view of a battery device provided in an embodiment of the present application;

[0048] Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along CC;

[0049] Figure 6 A schematic diagram of a portion of the structure of a battery device provided in an embodiment of the present application;

[0050] Figure 7 A partial structural schematic diagram of a battery device provided in an embodiment of the present application;

[0051] Figure 8Another partial structural principle diagram of a battery device provided in an embodiment of the present application;

[0052] Fig. 9 This is another partial structural principle diagram of the battery device provided in the embodiment of the present application.

[0053] In the drawings, the figures are not necessarily drawn to scale.

[0054] Description of reference numerals:

[0055] 1- Vehicle;

[0056] 10-battery device; 11-box; 11a-accommodation chamber; 11b-exhaust channel; 111b-first flow channel; 112b-second flow channel; 111-first sub-box; 112-second sub-box; 113-first opening; 1131-corner opening; 114-frame; 1a-motor; 1b-controller;

[0057] 20-battery monomer assembly;

[0058] 30 - battery cell; 31 - shell; 311 - housing; 312 - end cover; 32 - electrode assembly; 321 - electrode body; 322 - pole ear; 33 - electrode terminal; 34 - first pressure relief mechanism;

[0059] 40- second pressure relief mechanism;

[0060] 50 - collecting member; 50a - collecting chamber; 51 - piping; 51a - second opening. DETAILED DESCRIPTION

[0061] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0063] Reference to "embodiments" in this application 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 in this application may be combined with other embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. 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 application generally indicates that the associated objects before and after are in an "or" relationship.

[0066] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0067] The battery device mentioned in the embodiments 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, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0068] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0069] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0070] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0071] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0072] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0073] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0074] 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.

[0075] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0076] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0077] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0078] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0079] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0080] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0081] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0082] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel or titanium.

[0083] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0084] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0085] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0086] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes.

[0087] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0088] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0089] In some embodiments, the electrode assembly is a laminate structure.

[0090] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0091] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0092] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0093] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0094] As an example, the battery cell 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 prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0095] In the case of thermal runaway of the battery device, the battery cells release emissions into the box of the battery device. As the thermal runaway of the battery device spreads, a large amount of high-temperature and high-pressure emissions accumulate in the box and need to be discharged to the outside of the box through the relevant exhaust channels. Usually, the emissions of the battery device contain substances in various states such as solid particles, liquids and steam. In the process of the emissions flowing through the exhaust channel, part of the steam will condense into droplets, and deposit and remain in the exhaust channel. In addition, the solid particles and liquids mixed in the emissions will also partially settle and remain in the exhaust channel. In this way, as the thermal runaway of the battery device spreads, a large amount of particles and liquids remain in the exhaust channel, which can easily cause the risk of the exhaust channel being blocked, thereby affecting the exhaust process of the battery device, thus seriously affecting the reliability of the battery device.

[0096] In view of this, the battery device provided in the embodiment of the present application includes a battery cell, a housing, a second pressure relief mechanism and a collecting piece, the battery cell has a first pressure relief mechanism, the housing has a receiving chamber, the battery cell is received in the receiving chamber, the housing has an exhaust passage, the exhaust passage is connected to the receiving chamber, and the wall of the exhaust passage has at least one first opening. The second pressure relief mechanism is provided in the housing, and the exhaust passage is configured to guide the emissions discharged by the first pressure relief mechanism to the second pressure relief mechanism to be discharged from the housing. The collecting piece is provided outside the exhaust passage, and the collecting piece has a collecting chamber, which is connected to the exhaust passage through at least one first opening and is used to collect at least part of the emissions.

[0097] The battery device provided in the embodiment of the present application is provided with a collecting piece, and the collecting piece is arranged to be connected to the exhaust channel through the first opening. In the case of thermal runaway of the battery device, some particles and liquids in the exhaust can be collected by the collecting chamber of the collecting piece, which is beneficial to reducing the risk of some particles in the exhaust settling and remaining in the exhaust channel and causing the exhaust channel to be blocked, which is beneficial to improving the exhaust smoothness of the battery device in the case of thermal runaway, reducing the risk of excessive internal air pressure of the battery device, and thereby improving the reliability of the battery device.

[0098] The technical solutions described in the embodiments of the present application are applicable to battery devices and electrical devices using the battery devices.

[0099] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical device.

[0100] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, 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.

[0101] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0102] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. The 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 10 is provided inside the vehicle 1, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1, for example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0103] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0104] In some embodiments of the present application, the battery device 10 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 .

[0105] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3 A schematic diagram of the structure of a battery cell assembly 20 in a battery device 10 provided in an embodiment of the present application. The battery device 10 includes a housing 11 and a battery cell 30, and the battery cell 30 is accommodated in the housing 11. The housing 11 is used to provide a storage space for the battery cell 30, and the housing 11 can adopt a variety of structures. In some embodiments, the housing 11 may include a first sub-housing 111 and a second sub-housing 112, and the first sub-housing 111 and the second sub-housing 112 cover each other, and the first sub-housing 111 and the second sub-housing 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0106] In the battery device 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery device 10 may also be a battery cell assembly 20 in which multiple battery cells 30 are first connected in series, in parallel, or in a mixed connection, and then the multiple battery cell assemblies 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery device 10 may also include other structures, for example, the battery device 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0107] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0108] Please refer to Figure 4 , Figure 4 Schematic diagram of the exploded structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0109] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0110] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312, and the insulating structure may be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0111] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 321 of the electrode assembly 32, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tabs 322. The positive tab and the negative tab may be located together at one end of the electrode body 321 or at both ends of the electrode body 321, respectively. During the charge and discharge process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tabs 322 are connected to the electrode terminals 33 to form a current loop.

[0112] In some embodiments, a first pressure relief mechanism 34 is disposed on the housing 31 , and the first pressure relief mechanism 34 is used to release the internal pressure of the battery cell 30 .

[0113] As an example, when the internal pressure or temperature of the battery cell 30 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 30 reaches a predetermined threshold, the first pressure relief mechanism 34 performs an action or a weak structure provided in the first pressure relief mechanism 34 is destroyed, 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 30.

[0114] As an example, the first pressure relief mechanism 34 may be integrally formed with the housing 31 . For example, a notch is made on the housing 31 to form a weak structure, and the weak structure serves as the first pressure relief mechanism 34 .

[0115] The first pressure relief mechanism 34 may also be separately provided and connected to the housing 31. For example, the first pressure relief mechanism 34 is welded or connected to the housing 31 through other components. As an example, a notch is provided on the first pressure relief mechanism 34 to form a weak structure.

[0116] As an example, the first pressure relief mechanism 34 may be in the form of an explosion-proof valve, a balancing valve, a gas valve, a pressure relief valve, or a safety valve.

[0117] After the first pressure relief mechanism 34 of the battery cell 30 is actuated, the discharged exhaust will enter the accommodating chamber 11a. When the air pressure in the accommodating chamber 11a reaches the pressure relief threshold of the second pressure relief mechanism 40, the second pressure relief mechanism 40 is actuated to release the pressure in the accommodating chamber 11a.

[0118] The structural type of the second pressure relief mechanism 40 may be the same as or different from the structural type of the first pressure relief mechanism 34. The second pressure relief mechanism 40 may be in the form of an explosion-proof valve, a balancing valve, a gas valve, a pressure relief valve or a safety valve.

[0119] The "actuation" mentioned in this application means that the first pressure relief mechanism 34 is in action or activated to a certain state, so that the internal pressure and temperature of the battery cell 30 can be released. The action produced by the first pressure relief mechanism 34 may include but is not limited to: the components in the first pressure relief mechanism 34 move to form an exhaust flow channel, at least a part of the first pressure relief mechanism 34 ruptures, breaks, is torn or opened, and so on. When the first pressure relief mechanism 34 is actuated, the high-temperature and high-pressure substances inside the battery cell 30 will be discharged from the actuated part as emissions. In this way, the battery cell 30 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0120] The emissions from the battery cells 30 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.

[0121] First, as Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the battery device 10 provided in the embodiment of the present application includes a battery cell 30, a box body 11, a second pressure relief mechanism 40 and a collecting member 50. The battery cell 30 has a first pressure relief mechanism 34. The box body 11 has a receiving chamber 11a. The battery cell 30 is received in the receiving chamber 11a. The box body 11 has an exhaust passage 11b. The exhaust passage 11b is connected to the receiving chamber 11a. The wall of the exhaust passage 11b has at least one first opening 113. The second pressure relief mechanism 40 is provided in the box body 11. The exhaust passage 11b is configured to guide the exhaust discharged by the first pressure relief mechanism 34 to the second pressure relief mechanism 40 to be discharged from the box body 11. The collecting member 50 is provided outside the exhaust passage 11b. The collecting member 50 has a collecting chamber 50a. The collecting chamber 50a is connected to the exhaust passage 11b through at least one first opening 113 and is used to collect at least part of the exhaust.

[0122] When the battery cell 30 is in thermal runaway, the first pressure relief mechanism 34 is actuated to release the pressure inside the battery cell 30 . The exhaust discharged from the battery cell 30 is first discharged into the accommodating chamber 11 a of the box body 11 , and then flows from the accommodating chamber 11 a to the exhaust passage 11 b of the box body 11 .

[0123] The exhaust channel 11b is configured to guide the exhaust discharged from the battery cell 30 to the second pressure relief mechanism 40, and the exhaust channel 11b can be located on the path from the first pressure relief mechanism 34 of the battery cell 30 to the second pressure relief mechanism 40 of the box body 11. Optionally, the exhaust channel 11b can be located inside the frame 114 of the box body 11, or the exhaust channel 11b can be located in the accommodating cavity 11a. Of course, a part of the exhaust channel 11b can also be located in the accommodating cavity 11a, and the other part can be located in the frame 114 of the box body 11.

[0124] The accommodating chamber 11a is connected to the exhaust passage 11b, and the pressure in the accommodating chamber 11a acts on the second pressure relief mechanism 40 through the exhaust passage 11b. When the pressure in the accommodating chamber 11a reaches the pressure relief threshold of the second pressure relief mechanism 40, the second pressure relief mechanism 40 is actuated and discharges the exhaust to the outside of the box body 11 to reduce the pressure in the accommodating chamber 11a.

[0125] The wall of the exhaust passage 11b has at least one first opening 113. Optionally, the wall of the exhaust passage 11b may have one, two or more first openings 113. The collecting chamber 50a of one collecting member 50 may communicate with the exhaust passage 11b through one, two or more first openings 113. Optionally, the battery device 10 may have one, two or more collecting members 50, and the plurality of collecting members 50 may be arranged at intervals along the path of the exhaust passage 11b.

[0126] Optionally, the collecting member 50 may be in a pipe shape, or the collecting member 50 may be in a box shape, and the collecting chamber 50a is sealed and communicated with the exhaust passage 11b.

[0127] The collecting chamber 50a of the collecting member 50 can be connected to the exhaust channel 11b through a first opening 113, so that the collecting chamber 50a can be connected in parallel with the exhaust channel 11b, and the emissions will collide with the wall of the collecting chamber 50a after entering the collecting chamber 50a through the first opening 113, and some particles in the emissions will remain in the collecting chamber 50a after colliding with the wall of the collecting chamber 50a, and some steam in the emissions will condense after colliding with the wall of the collecting chamber 50a, and settle and remain in the collecting chamber 50a. Some emissions may return to the exhaust channel 11b through the first opening 113, so that when the emissions flow through the exhaust channel 11b, some solid particles and liquid droplets in the emissions will always remain in the collecting chamber 50a.

[0128] The collecting chamber 50a of the collecting member 50 can also be connected to the exhaust channel 11b through two first openings 113, so that the exhaust enters the collecting chamber 50a through one first opening 113 and collides with the wall of the collecting chamber 50a in the collecting chamber 50a. In this way, the particles in the exhaust collide with the wall of the collecting chamber 50a and remain in the collecting chamber 50a, and the steam therein condenses after colliding with the wall of the collecting chamber 50a, and settles and remains in the collecting chamber 50a, and a part of the exhaust flows into the exhaust channel 11b again through the other first opening 113.

[0129] Therefore, by setting the collecting chamber 50a of the collecting member 50 to be connected with the exhaust channel 11b, when the battery cell 30 is in thermal runaway, some particles in the exhaust will remain in the collecting chamber 50a while flowing through the exhaust channel 11b, thereby reducing the particles flowing through the exhaust channel 11b. This is beneficial to reducing the risk of the exhaust channel 11b being blocked by particles and liquids, and further beneficial to improving the exhaust smoothness of the battery device 10 in the event of thermal runaway.

[0130] The battery device 10 provided in the embodiment of the present application is provided with a collecting member 50, and the collecting chamber 50a of the collecting member 50 is connected to the exhaust channel 11b through the first opening 113. In the case of thermal runaway of the battery device 10, some particles and liquids in the exhaust can be collected by the collecting chamber 50a of the collecting member 50, which is beneficial to reducing the risk of some particles in the exhaust being settled and retained in the exhaust channel 11b and causing the exhaust channel 11b to be blocked, and is beneficial to improving the exhaust smoothness of the battery device 10 in the case of thermal runaway, reducing the risk of excessive internal air pressure of the battery device 10, and thereby improving the reliability of the battery device 10.

[0131] In some embodiments, Figure 7 and Fig. 9 As shown, the collecting member 50 is disposed outside the box body 11 and covers at least one first opening 113 . The collecting member 50 and the box body 11 are surrounded to form a collecting chamber 50 a .

[0132] The collecting member 50 is disposed on the outside of the box body 11 and covers at least one first opening 113 . Optionally, the collecting member 50 may cover one, two or more first openings 113 .

[0133] The collecting member 50 and the box body 11 form a collecting chamber 50 a , which can not only achieve the purpose of collecting particles in the emissions by the collecting member 50 , but also help to simplify the structure of the collecting member 50 and reduce the overall weight of the battery device 10 .

[0134] In some embodiments, Figure 7 As shown, the collecting member 50 is disposed to cover a first opening 113 .

[0135] The collecting member 50 is arranged to cover a first opening 113, and the collecting chamber 50a of the collecting member 50 is connected to the exhaust channel 11b through the first opening 113. In this way, after the emissions in the exhaust channel 11b enter the collecting chamber 50a, they all collide with the wall of the collecting chamber 50a, generating a greater impact force on the wall of the collecting chamber 50a, so that more particles in the emissions remain in the collecting chamber 50a, thereby further reducing the risk of particles in the emissions clogging the exhaust channel 11b.

[0136] In some embodiments, Fig. 9 As shown, the collecting member 50 covers at least two first openings 113 that are spaced apart from each other.

[0137] The collecting member 50 covers at least two first openings 113 that are spaced apart from each other, and the collecting chamber 50a of the collecting member 50 is connected to the exhaust channel 11b through at least two first openings 113. In this way, after the emissions in the exhaust channel 11b enter the collecting chamber 50a through one of the first openings 113, a portion of the emissions collides with the wall of the collecting chamber 50a. After the collision, the flow direction of the emissions changes, and the emissions can flow along the collecting chamber 50a to the other first openings 113, and enter the exhaust channel 11b again through the other first openings 113.

[0138] In this way, after the emissions in the exhaust channel 11b enter the collecting chamber 50a, the flow in the collecting chamber 50a is smoother. After the emissions return to the exhaust channel 11b again through the other first openings 113, the impact on the airflow in the exhaust channel 11b is smaller, thereby reducing the interference with the flow of emissions in the exhaust channel 11b, and further helping to improve the smoothness of the emissions in the exhaust channel 11b.

[0139] In some embodiments, Figure 6 As shown, the collecting member 50 includes a pipeline 51, and the pipeline 51 has a collecting chamber 50a. Both ends of the pipeline 51 each have a second opening 51a, and the two second openings 51a are respectively connected to two first openings 113 arranged at intervals.

[0140] The first openings 113 and the second openings 113 may be sealed and communicated with each other, respectively, to reduce the risk of leakage of exhaust from the connection between the first opening 113 and the second opening 51 a.

[0141] The collecting member 50 includes a pipeline 51 and is connected to the exhaust passage 11 b through the pipeline 51 , which is beneficial to simplifying the structure of the collecting member 50 and facilitating flexible setting of the position of the pipeline 51 .

[0142] The second openings 51a at both ends of the pipe 51 are respectively connected to the two first openings 113. When the exhaust in the exhaust passage 11b flows through the first first opening 113 connected to the pipe 51 along the exhaust path, part of the exhaust will enter the pipe 51 through the first opening 113 and collide with the wall of the pipe 51, and some particles and liquid will remain in the pipe 51. Part of the exhaust entering the pipe 51 will flow along the pipe 51 and return to the exhaust passage 11b again through the second opening 51a and the first opening 113 at the other end of the pipe 51.

[0143] Therefore, the collecting member 50 is provided to include a pipeline 51, and second openings 51a at both ends of the pipeline 51 are provided to be connected to the first opening 113 respectively, which is beneficial to simplifying the structure of the collecting member 50 and facilitating the flexible setting of the position of the pipeline 51. In addition, when the exhaust gas flows through the pipeline 51, the exhaust gas will flow more smoothly in the pipeline 51, which is further beneficial to improving the exhaust smoothness in the case of thermal runaway of the battery device 10.

[0144] In some embodiments, Figure 7 , Figure 8 and Fig. 9 As shown, the exhaust channel 11b includes a first flow channel 111b and a second flow channel 112b that are adjacently arranged, and the extension direction of the first flow channel 111b intersects with the extension direction of the second flow channel 112b. Along the extension direction of the exhaust channel 11b, the first flow channel 111b is arranged on a side of the second flow channel 112b that is away from the second pressure relief mechanism 40, and at least one first opening 113 includes a corner opening 1131, which is arranged at one end of the first flow channel 111b close to the second flow channel 112b and is arranged opposite to the extension direction of the first flow channel 111b.

[0145] The extending directions of the first flow channel 111b and the second flow channel 112b intersect each other. For example, the extending directions of the first flow channel 111b and the second flow channel 112b may be perpendicular to each other.

[0146] The first flow channel 111b is arranged on the side of the second flow channel 112b facing away from the second pressure relief mechanism 40, and the exhaust will flow from the first flow channel 111b to the second flow channel 112b when flowing through the exhaust passage 11b. Therefore, when the exhaust flows through the first flow channel 111b, it flows along the extension direction of the first flow channel 111b, and when it flows through the junction of the first flow channel 111b and the second flow channel 112b, due to inertia, the exhaust will continue to flow along the extension direction of the first flow channel 111b.

[0147] Since the first opening 113 includes a corner opening 1131, and the corner opening 1131 is arranged at one end of the first flow channel 111b close to the second flow channel 112b and is arranged opposite to the extension direction of the first flow channel 111b, the emissions in the first flow channel 111b will flow to one end of the first flow channel 111b close to the second flow channel 112b and, under the action of inertia, will enter the collecting chamber 50a through the corner opening 1131 and collide with the wall of the collecting chamber 50a. In this way, the impact force between the emissions and the inner wall of the exhaust channel 11b can be reduced, thereby reducing the risk of particles in the emissions remaining in the exhaust channel 11b and thereby clogging the exhaust channel 11b.

[0148] In this way, by setting the first opening 113 to include a corner opening 1131, and setting the collecting chamber 50a of the collecting member 50 to be connected to the corner opening 1131, when the path of the exhaust channel 11b changes, the emissions can collide with the inner wall of the collecting member 50 without having to collide with the inner wall of the exhaust channel 11b, which is beneficial to increase the amount of particles collected in the collecting chamber 50a and reduce the collision of emissions with the inner wall of the exhaust channel 11b, further reducing the risk of particles accumulating in the exhaust channel 11b and causing blockage of the exhaust channel 11b, which is beneficial to improve the exhaust smoothness of the battery device 10 in the event of thermal runaway.

[0149] In some embodiments, Figure 7 As shown, the collecting chamber 50 a is communicated with the exhaust passage 11 b through a first opening 113 , and the first opening 113 communicated with the collecting chamber 50 a is a corner opening 1131 .

[0150] In this way, the collecting chamber 50a is connected to the exhaust channel 11b only through the corner opening 1131, which is beneficial to increase the impact force of the exhaust gas with the inner wall of the collecting chamber 50a after entering the collecting chamber 50a, and is beneficial to increase the amount of particles retained in the collecting chamber 50a, thereby improving the ability of the collecting element 50 to collect particles.

[0151] In some embodiments, Figure 8 and Fig. 9 As shown, the collecting chamber 50a is connected to the exhaust passage 11b through two first openings 113. One of the two first openings 113 is a corner opening 1131, or both of the two first openings 113 are corner openings 1131.

[0152] In this way, the collecting chamber 50a is connected to the exhaust channel 11b through at least one corner opening 1131. When the exhaust in the exhaust channel 11b flows through the corner opening 1131 connected to the collecting chamber 50a, it will enter the collecting chamber 50a through the corner opening 1131 and collide with the inner wall of the collecting chamber 50a. Some particles in the exhaust will remain in the collecting chamber 50a.

[0153] Since the collecting chamber 50a is connected to the exhaust channel 11b through the two first openings 113, the collecting chamber 50a is connected to the exhaust channel 11b in parallel. After the exhaust in the exhaust channel 11b enters the collecting chamber 50a from one first opening 113, it can return to the exhaust channel 11b through the other first opening 113. This is conducive to improving the smoothness of the discharge of the exhaust in the accommodating chamber 11a to the outside of the battery device 10.

[0154] In the case where one of the two first openings 113 is a corner opening 1131, along the flow direction of the exhaust, the corner opening 1131 can be provided at one side of the two first openings 113 close to the second pressure relief mechanism 40, or the corner opening 1131 can be provided at one side of the two first openings 113 far from the second pressure relief mechanism 40. In this way, the exhaust from the exhaust passage 11b flows into the collection chamber 50a after passing through the corner opening 1131, collides with the inner wall of the collection chamber 50a, and then returns to the exhaust passage 11b through the other first opening 113, and this process continues.

[0155] When the two first openings 113 are both corner openings 1131, the exhaust in the exhaust channel 11b will flow into the collecting chamber 50a when passing through the two corner openings 1131, and collide with the interior of the collecting chamber 50a, and retain some particles. This is beneficial to increase the amount of particles collected by the collecting chamber 50a, and further reduce the risk of the exhaust channel 11b being blocked.

[0156] Therefore, setting the collecting chamber 50a to communicate with the two first openings 113, and setting at least one of the two first openings 113 to be a corner opening 1131 is beneficial for improving the smoothness of discharging emissions in the event of thermal runaway of the battery device 10, while also helping to increase the amount of particles collected by the collecting chamber 50a, further reducing the risk of the exhaust passage 11b being blocked.

[0157] In some embodiments, Figure 4 and Figure 5 As shown, the box body 11 includes a frame 114 , which surrounds a receiving cavity 11 a , and at least a portion of the exhaust passage 11 b is disposed in the frame 114 .

[0158] The frame 114 can play a certain supporting role, so that the box body 11 has a certain structural strength to support the battery cells 30 in the box body 11 .

[0159] At least part of the exhaust passage 11 b is disposed in the frame 114 . The frame 114 can be used to set the exhaust passage 11 b , which is beneficial to simplify the structure of the box 11 without affecting the structural strength of the box 11 , thereby reducing the production cost of the battery device 10 .

[0160] In some embodiments, the material of the negative electrode sheet of the battery cell 30 includes graphite, the material of the positive electrode sheet of the battery cell 30 includes lithium iron phosphate material, and the volume of the collection chamber 50a is V1, where V1≥0.05L.

[0161] Optionally, the lithium iron phosphate material may be lithium iron phosphate, lithium iron manganese phosphate, a mixture of lithium iron phosphate and lithium iron manganese phosphate, or a product of lithium iron phosphate doped with other elements, etc. The corresponding battery cell 30 may be a lithium iron phosphate battery cell.

[0162] Optionally, V1 can be 0.05L, 0.1L, 0.2L, 0.3L, 0.4L, 0.5L, 0.6L, 0.7L, 0.8L, 0.9L or 1L, etc.

[0163] To this end, the inventor conducted a series of tests on different battery devices 10, in which the negative electrode sheet of the battery cell 30 in the battery device 10 includes graphite and the positive electrode sheet includes lithium iron phosphate. In the test, only the volume of the collecting chamber 50a of the different battery devices 10 was changed, while other parameters remained unchanged, and the test results shown in Table 1 were obtained. It should be noted that silicon was not added to the negative electrode sheet material in this group of tests.

[0164] Table 1 The proportion of blocked exhaust channel 11b corresponding to different volumes of collecting chamber 50a

[0165]

[0166] As can be seen from the table above, in the comparative example where V1 is less than 0.05L, a large proportion of the exhaust passage 11b will be blocked, wherein the larger the V1, the greater the proportion of the exhaust passage 11b being blocked. When V reaches 0.05L, the proportion of the exhaust passage 11b being blocked is greatly reduced.

[0167] Therefore, after systematic analysis and long-term practice, the inventors found that for the battery cell 30 in the battery device 10 whose negative electrode material includes graphite and whose positive electrode material includes lithium iron phosphate material, setting the volume V1 of the collection chamber 50a to ≥ 0.05L is helpful to further reduce the risk of the exhaust channel 11b being blocked.

[0168] In some embodiments, V1 ≥ 0.1L.

[0169] It can be seen from Table 1 above that for the battery cell 30 in which the negative electrode material includes graphite and the positive electrode material includes lithium iron phosphate material in the battery device 10, when V1 reaches 0.1L or above, the exhaust channel 11b will not be blocked. Therefore, by setting V1≥0.1L, it is helpful to further reduce the risk of the exhaust channel 11b being blocked.

[0170] In some embodiments, the material of the negative electrode sheet of the battery cell 30 includes silicon, the material of the positive electrode sheet of the battery cell 30 includes lithium iron phosphate material, and the volume of the collection chamber 50a is V1, where V1≥0.08L.

[0171] The material of the negative electrode plate may also include graphite. For a battery cell 30 whose negative electrode plate material includes silicon, the chemical reaction is more intense in the case of thermal runaway, and more emissions are released per unit time. Therefore, the volume of the required collection chamber 50a is also larger.

[0172] Optionally, V1 can be 0.08L, 0.1L, 0.15L, 0.2L, 0.3L, 0.4L, 0.5L, 0.6L, 0.7L, 0.8L, 0.9L or 1L, etc.

[0173] To this end, the inventors conducted a series of experiments on different battery devices 10. The materials of the negative electrode sheets of the battery cells 30 in the battery devices 10 included graphite and silicon, and the materials of the positive electrode sheets included lithium iron phosphate materials. During the experiments, only the volumes of the collection chambers 50a of the different battery devices 10 were changed, while other parameters remained unchanged, and the experimental results shown in Table 2 were obtained.

[0174] Table 2 The proportion of blocked exhaust channel 11b corresponding to different volumes of collecting chamber 50a

[0175]

[0176] It can be seen from Table 2 above that in the comparative examples where V1 is less than 0.08 L, the exhaust passage 11 b is blocked at different rates, while when V1 reaches 0.08 L, the rate of blockage in the exhaust passage 11 b is greatly reduced.

[0177] Therefore, after systematic analysis and long-term practice, the inventors found that for the battery cell 30 in the battery device 10 whose negative electrode material includes graphite and silicon and whose positive electrode material includes lithium iron phosphate material, setting the volume V1 of the collection chamber 50a to ≥ 0.08L is beneficial to further reduce the risk of the exhaust channel 11b being blocked.

[0178] In some embodiments, V1 ≥ 0.15L.

[0179] It can be seen from Table 2 above that for the battery cell 30 in which the negative electrode material includes graphite and silicon and the positive electrode material includes lithium iron phosphate material in the battery device 10, when V1 reaches 0.15L or above, the exhaust channel 11b will not be blocked. Therefore, by setting V1≥0.15L, it is helpful to further reduce the risk of the exhaust channel 11b being blocked.

[0180] In some embodiments, the material of the negative electrode sheet of the battery cell 30 includes graphite, the material of the negative electrode sheet of the battery cell 30 includes a ternary material, and the volume of the collection chamber 50a is V1, where V1≥0.1L.

[0181] The negative electrode sheet may include a ternary material. Optionally, the negative electrode sheet may include a ternary material, cobalt-free high nickel, and a compound composed of nickel, manganese, cobalt or lithium aluminate in any proportion. The corresponding battery cell 30 is a ternary battery cell.

[0182] The chemical reaction of the ternary battery cell is more violent in the case of thermal runaway, and more emissions are generated per unit time, and the content of particles in the emissions is also higher. Therefore, the collection chamber 50a needs to have a larger volume to store more particles.

[0183] Optionally, V1 can be 0.1L, 0.2L, 0.3L, 0.4L, 0.5L, 0.6L, 0.7L, 0.8L, 0.9L or 1L, etc.

[0184] To this end, the inventor conducted a series of tests on different battery devices 10, in which the negative electrode sheet material of the battery cell 30 in the battery device 10 includes graphite, and the positive electrode sheet material includes a ternary material. In the test, only the volume of the collecting chamber 50a of the different battery devices 10 was changed, while other parameters remained unchanged, and the test results shown in Table 3 were obtained. It should be noted that silicon was not added to the negative electrode sheet material in this group of tests.

[0185] Table 3 The proportion of blocked exhaust channel 11b corresponding to different volumes of collecting chamber 50a

[0186]

[0187] It can be seen from Table 3 above that in the comparative examples where V1 is less than 0.1 L, the exhaust passage 11 b is blocked at different rates, while when V1 reaches 0.1 L, the rate of blockage in the exhaust passage 11 b is greatly reduced.

[0188] Therefore, after systematic analysis and long-term practice, the inventors found that for the battery cell 30 in which the material of the negative electrode plate in the battery device 10 includes graphite and the material of the positive electrode plate includes a ternary material, setting the volume V1 of the collection chamber 50a to ≥ 0.1L is beneficial to further reduce the risk of the exhaust channel 11b being blocked.

[0189] In some embodiments, V1 ≥ 0.2L.

[0190] It can be seen from Table 3 above that for the battery cell 30 in which the negative electrode material of the battery device 10 includes graphite and the positive electrode material includes a ternary material, when V1 reaches 0.2L or above, the exhaust channel 11b will not be blocked. Therefore, by setting V1≥0.2L, it is helpful to further reduce the risk of the exhaust channel 11b being blocked.

[0191] In some embodiments, the material of the negative electrode sheet of the battery cell 30 includes silicon, the material of the negative electrode sheet of the battery cell 30 includes a ternary material, and the volume of the collection chamber 50 a is V1 ≥ 0.2L.

[0192] The material of the negative electrode plate may also include graphite. For the battery cell 30 in which the material of the positive electrode plate includes a ternary material and the material of the negative electrode plate includes silicon, the chemical reaction is more violent in the case of thermal runaway, and more emissions are released per unit time. Therefore, the volume of the required collection chamber 50a is also larger.

[0193] Optionally, V1 can be 0.2L, 0.3L, 0.4L, 0.5L, 0.6L, 0.7L, 0.8L, 0.9L or 1L, etc.

[0194] The inventors conducted a series of tests on different battery devices 10. The materials of the negative electrode sheets of the battery cells 30 in the battery devices 10 included graphite and silicon, and the materials of the positive electrode sheets included ternary materials. During the tests, only the volumes of the collecting chambers 50a of the different battery devices 10 were changed, while other parameters remained unchanged, and the test results shown in Table 4 were obtained.

[0195] Table 4 Blockage ratio of exhaust channel 11b corresponding to different volumes of collecting chamber 50a

[0196]

[0197] It can be seen from Table 4 above that in the comparative examples where V1 is less than 0.2 L, the exhaust passage 11 b is blocked at different rates, while when V1 reaches 0.2 L, the rate of blockage in the exhaust passage 11 b is greatly reduced.

[0198] Therefore, after systematic analysis and long-term practice, the inventors found that for the battery cell 30 in which the material of the negative electrode plate in the battery device 10 includes graphite and silicon and the material of the positive electrode plate includes a ternary material, setting the volume V1 of the collection chamber 50a to ≥ 0.2L is beneficial to further reduce the risk of the exhaust channel 11b being blocked.

[0199] In some embodiments, V1 ≥ 0.3L.

[0200] It can be seen from Table 4 above that for the battery cell 30 in which the negative electrode material includes graphite and silicon and the positive electrode material includes a ternary material in the battery device 10, when V1 reaches 0.3L or above, the exhaust channel 11b will not be blocked. Therefore, by setting V1≥0.3L, it is helpful to further reduce the risk of the exhaust channel 11b being blocked.

[0201] In a second aspect, the electrical device provided in the embodiments of the present application includes the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0202] The electric device provided in the embodiment of the present application has the same technical effect as the battery device 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0203] In some embodiments, the battery device 10 provided in the embodiment of the present application includes a battery cell 30, a box 11, a second pressure relief mechanism 40 and a collecting member 50, wherein the battery cell 30 has a first pressure relief mechanism 34, the box 11 has a receiving chamber 11a, and the battery cell 30 is received in the receiving chamber 11a, the box 11 has an exhaust passage 11b, the exhaust passage 11b is connected to the receiving chamber 11a, and the wall of the exhaust passage 11b has at least one first opening 113. The second pressure relief mechanism 40 is provided in the box 11, and the exhaust passage 11b is configured to guide the exhaust discharged by the first pressure relief mechanism 34 to the second pressure relief mechanism 40 to be discharged from the box 11. The collecting member 50 is provided outside the exhaust passage 11b, and the collecting member 50 has a collecting chamber 50a, which is connected to the exhaust passage 11b through at least one first opening 113 and is used to collect the exhaust. The collecting member 50 includes a pipeline 51, and the pipeline 51 has a collecting chamber 50a. The two ends of the pipeline 51 each have a second opening 51a, and the two second openings 51a are respectively connected to two first openings 113 arranged at intervals. The exhaust channel 11b includes a first flow channel 111b and a second flow channel 112b arranged adjacent to each other, and the extension direction of the first flow channel 111b intersects with the extension direction of the second flow channel 112b. Along the extension direction of the exhaust channel 11b, the first flow channel 111b is arranged on the side of the second flow channel 112b facing away from the second pressure relief mechanism 40, and at least one first opening 113 includes a corner opening 1131, and the corner opening 1131 is arranged at one end of the first flow channel 111b close to the second flow channel 112b, and is arranged opposite to the extension direction of the first flow channel 111b. The battery cell 30 can be a ternary battery cell.

[0204] The battery device 10 provided in the embodiment of the present application is provided with a collecting member 50, and the collecting chamber 50a of the collecting member 50 is connected to the exhaust channel 11b through the first opening 113. In the case of thermal runaway of the battery device 10, some particles and liquids in the exhaust can be collected by the collecting chamber 50a of the collecting member 50, which is beneficial to reducing the risk of some particles in the exhaust being settled and retained in the exhaust channel 11b and causing the exhaust channel 11b to be blocked, and is beneficial to improving the exhaust smoothness of the battery device 10 in the case of thermal runaway, reducing the risk of excessive internal air pressure of the battery device 10, and thereby improving the reliability of the battery device 10.

[0205] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that: include: A battery cell having a first pressure relief mechanism; A box body having a receiving cavity, wherein the battery cell is received in the receiving cavity, the box body having an exhaust passage, the exhaust passage being communicated with the receiving cavity, and a wall portion of the exhaust passage having at least one first opening; A second pressure relief mechanism is provided in the housing, and the exhaust passage is configured to guide the exhaust discharged by the first pressure relief mechanism to the second pressure relief mechanism to be discharged from the housing; The collecting member is arranged outside the exhaust passage, and has a collecting chamber. The collecting chamber is communicated with the exhaust passage through at least one of the first openings, and is used for collecting at least part of the exhaust.

2. The battery device according to claim 1, characterized in that: The collecting member cover is arranged outside the box body and covers at least one of the first openings. The collecting member and the box body are surrounded to form the collecting cavity.

3. The battery device according to claim 2, characterized in that: The collecting member is arranged to cover one of the first openings.

4. The battery device according to claim 2, characterized in that: The collecting member covers at least two of the first openings that are spaced apart from each other.

5. The battery device according to claim 1, characterized in that: The collecting member comprises a pipeline, the pipeline has the collecting cavity, and both ends of the pipeline have a second opening respectively, and the two second openings are respectively connected one by one with two first openings arranged at intervals.

6. The battery device according to claim 1, characterized in that: The exhaust passage comprises a first flow channel and a second flow channel arranged adjacent to each other, and an extension direction of the first flow channel intersects with an extension direction of the second flow channel; Along the extension direction of the exhaust channel, the first flow channel is arranged on the side of the second flow channel facing away from the second pressure relief mechanism, and at least one of the first openings includes a corner opening, which is arranged at one end of the first flow channel close to the second flow channel and is arranged opposite to the extension direction of the first flow channel.

7. The battery device according to claim 6, characterized in that: The collecting chamber is communicated with the exhaust passage through the first opening, and the first opening communicated with the collecting chamber is the corner opening.

8. The battery device according to claim 6, characterized in that: The collecting chamber is in communication with the exhaust passage through the two first openings; One of the two first openings is the corner opening, or both of the two first openings are the corner openings.

9. The battery device according to claim 1, characterized in that: The box body comprises a frame, the frame is arranged to surround the accommodating cavity, and at least a part of the exhaust passage is arranged in the frame.

10. The battery device according to any one of claims 1 to 9, characterized in that: The material of the negative electrode sheet of the battery cell includes graphite, the material of the positive electrode sheet of the battery cell includes lithium iron phosphate material, and the volume of the collection chamber is V1, V1≥0.05L.

11. The battery device according to claim 10, characterized in that: V1≥0.1L.

12. The battery device according to any one of claims 1 to 9, characterized in that: The material of the negative electrode sheet of the battery cell includes silicon, the material of the positive electrode sheet of the battery cell includes lithium iron phosphate material, and the volume of the collection chamber is V1, V1≥0.08L.

13. The battery device according to claim 12, characterized in that: V1≥0.15L.

14. The battery device according to any one of claims 1 to 9, characterized in that: The material of the negative electrode sheet of the battery cell includes graphite, the material of the positive electrode sheet of the battery cell includes a ternary material, and the volume of the collection chamber is V1, V1≥0.1L.

15. The battery device according to claim 14, characterized in that: V1≥0.2L.

16. The battery device according to any one of claims 1 to 9, characterized in that: The material of the negative electrode sheet of the battery cell includes silicon, the material of the positive electrode sheet of the battery cell includes a ternary material, and the volume of the collection chamber is V1, V1≥0.2L.

17. The battery device according to claim 16, characterized in that: V1≥0.3L.

18. An electrical device, characterized in that: The battery device comprises a battery device as claimed in any one of claims 1 to 17, wherein the battery device is used to provide electrical energy.

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