Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device, and relates to the technical field of batteries. The battery device comprises a battery cell, a supporting piece and a shielding piece. The battery cell comprises a pressure relief mechanism, the supporting piece is configured to support the battery cell along a first direction, the pressure relief mechanism is arranged towards the supporting piece along the first direction, and the supporting piece is provided with an exhaust channel. The shielding piece is arranged between the pressure relief mechanism and the exhaust channel so as to separate the pressure relief mechanism from the exhaust channel; the shielding piece is configured to be capable of being rushed open when the pressure relief mechanism relieves pressure, and at least one part of the side wall of the exhaust channel is covered with the shielding piece. According to the battery device provided by the embodiment of the invention, when the pressure relief mechanism relieves the pressure, the shielding piece can be burst open, and at least one part of the side wall of the exhaust channel can be covered, so that emissions, discharged by the pressure relief mechanism, of the battery monomer are difficult to directly contact with the area covered by the shielding piece, and the reliability of the battery device is improved. And the risk that the side wall of the exhaust channel is melted 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] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. In this case, electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In the development of battery technology, the reliability of battery devices is an issue that cannot be ignored. If the reliability of a battery device is poor, it will be difficult for the battery device to be popularized. Therefore, how to improve the reliability of battery devices is a technical issue in battery technology that needs to be considered for a long time. Utility Model Content

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

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

[0006] In a first aspect, an embodiment of the present application provides a battery device, including a battery cell, a support member, and a shielding member. The battery cell includes a pressure relief mechanism, the support member is configured to support the battery cell along a first direction, the pressure relief mechanism is arranged toward the support member along the first direction, and the support member has an exhaust channel. The shielding member is arranged between the pressure relief mechanism and the exhaust channel to separate the pressure relief mechanism and the exhaust channel; the shielding member is configured to be able to be opened when the pressure relief mechanism releases pressure, and covers at least a portion of the side wall of the exhaust channel.

[0007] In the above embodiment, a shielding member is provided in the battery device, and the shielding member can play the role of separating the pressure relief mechanism and the exhaust channel. When the pressure relief mechanism releases pressure, the shielding member is impacted and can be opened, so that the emissions discharged from the battery cell through the pressure relief mechanism can flow from the area where the shielding member is originally located to the exhaust channel, and the shielding member can also cover at least a part of the side wall of the exhaust channel after being opened, so that the emissions discharged from the battery cell through the pressure relief mechanism are difficult to directly contact the area of ​​the side wall of the exhaust channel covered by the shielding member, thereby reducing the risk of the side wall of the exhaust channel being melted, thereby improving the overall reliability of the battery device.

[0008] In some embodiments, there are multiple battery cells, and the support member has multiple exhaust channels arranged along the second direction, each exhaust channel is arranged corresponding to at least one battery cell; the second direction is perpendicular to the first direction; wherein the side wall of the exhaust channel includes two side surfaces arranged opposite to each other along the second direction, and the shielding member is configured to cover at least a portion of at least one side surface when the pressure relief mechanism releases pressure. Multiple exhaust channels on the support member are arranged along the second direction, and when the pressure relief mechanism releases pressure, the shielding member covers at least a portion of at least one side surface, and the exhaust discharged from the battery cell through the pressure relief mechanism is difficult to directly contact the area of ​​the side wall of the exhaust channel covered by the shielding member, thereby reducing the risk of the side wall of the exhaust channel being melted, so that when the battery cell is in thermal runaway, it is difficult to affect the battery cells corresponding to other exhaust channels, thereby improving the overall reliability of the battery device.

[0009] In some embodiments, the shielding member is provided with a first weak portion, the first weak portion defines at least one first pressure relief area, the first pressure relief area is arranged opposite to the pressure relief mechanism along a first direction, and the first pressure relief area is configured to be able to be opened when the pressure relief mechanism releases pressure, and to cover at least a portion of the side wall of the exhaust passage. By providing the first weak portion, a first pressure relief area that can be opened and cover at least a portion of the side wall of the exhaust passage is obtained.

[0010] In some embodiments, the shielding member is provided with a first pressure relief groove, and the shielding member forms a first weak portion in the region where the first pressure relief groove is provided. The first pressure relief groove is provided to obtain the first weak portion that can be damaged.

[0011] In some embodiments, the first pressure relief groove includes a first section, the first pressure relief groove defines two first pressure relief areas, the two first pressure relief areas are respectively arranged on opposite sides of the first section along a second direction, and the second direction is perpendicular to the first direction; the side wall of the exhaust channel includes two side surfaces arranged opposite to each other along the second direction, one first pressure relief area is configured to cover at least a portion of one side surface when the pressure relief mechanism releases pressure, and the other first pressure relief area is configured to cover at least a portion of the other side surface when the pressure relief mechanism releases pressure.

[0012] In the above embodiment, when the pressure relief mechanism releases pressure, the two first pressure relief areas can rotate in a direction away from the battery cell, which, on the one hand, allows the emissions discharged from the battery cell through the pressure relief mechanism to be better discharged toward the exhaust channel, rather than just impacting the side wall on one side of the exhaust channel. Compared with only one first pressure relief area, it can reduce the situation where the emissions contact the side wall on one side of the exhaust channel more, thereby reducing the risk of the side wall of the exhaust channel being melted. On the other hand, the two first pressure relief areas can respectively cover the two side surfaces of the exhaust channel that are arranged opposite to each other along the second direction during the rotation process, which can protect at least a portion of the side walls on the opposite sides of the exhaust channel, further reducing the risk of the side wall of the exhaust channel being melted.

[0013] In some embodiments, the first pressure relief groove further includes two second sections spaced apart along the third direction, the first section connects the two second sections, and the first section and the two second sections define two first pressure relief areas; the first direction and the second direction are both perpendicular to the third direction. By defining the two first pressure relief areas by the first section and the two second sections, the first pressure relief area can be more easily destroyed when the pressure relief mechanism releases pressure, thereby quickly releasing the pressure inside the battery cell.

[0014] In some embodiments, the shielding member is further provided with a first flip groove, and the first flip groove is arranged at intervals with the first section along the second direction, and the first flip groove is configured to guide the first pressure relief area to flip and cover at least a portion of the side wall of the exhaust passage. The provision of the first flip groove enables the first pressure relief area to flip along a preset direction when the shielding member is impacted. Exemplarily, when the shielding member is impacted, the shielding member ruptures along the first pressure relief groove and flips along the first flip groove as a rotation axis to cover at least a portion of the side wall of the exhaust passage.

[0015] In some embodiments, the size of the first pressure relief area along the second direction is d1, and the size of the exhaust channel along the first direction is d2, and d1≥d2. Through this arrangement, when the pressure relief mechanism releases pressure and the first pressure relief area flips away from the battery cell, the side wall of the exhaust channel can be completely covered to better protect the side wall of the exhaust channel, thereby reducing the risk of the side wall of the exhaust channel being melted.

[0016] In some embodiments, along the first direction, the shielding member has a first surface and a second surface opposite to each other, and the first surface and / or the second surface is provided with a first pressure relief groove. Through the above arrangement, the shielding member can be more easily damaged when the pressure relief mechanism releases pressure, thereby quickly releasing the pressure inside the battery cell.

[0017] In some embodiments, the shielding member is further provided with a first reversal groove, and the first reversal groove is configured to guide the first pressure relief zone to reverse and cover at least a portion of the side wall of the exhaust passage. The first pressure relief groove can be set to an arc shape, and the first reversal groove is connected to the opposite ends of the arc; for another example, the first pressure relief groove and the first reversal groove can be enclosed to form a triangular structure, and the first reversal groove can be one of the sides; for another example, the first pressure relief groove and the first reversal groove can be enclosed to form a circle or a quasi-circle. In both cases, the first reversal groove can guide the first pressure relief zone to reverse and cover at least a portion of the side wall of the exhaust passage.

[0018] In some embodiments, along the first direction, the shielding member has a first surface facing the battery cell, and the first flip groove is disposed on the first surface. Based on this arrangement, during the flipping process of the first pressure relief zone, the interference between the first pressure relief zone and other areas of the shielding member can be reduced, thereby making it easier for the first pressure relief zone to flip, thereby quickly releasing the pressure inside the battery cell.

[0019] In some embodiments, the pressure relief mechanism is provided with a second weak portion, the second weak portion defines at least one second pressure relief zone, the second pressure relief zone is arranged opposite to the first pressure relief zone along the first direction, and the second pressure relief zone is configured to be able to open when the second weak portion is destroyed.

[0020] In the above embodiment, when the battery cell is in a normal state (i.e., the pressure relief mechanism is not in a pressure relief state), the second pressure relief area can block the inside and outside of the battery cell; when the battery cell is in an abnormal state and needs to be relieved by the pressure relief mechanism, the second weak portion is destroyed to support the release of the pressure inside the battery cell. By arranging the second pressure relief area relative to the first pressure relief area, after the emissions discharged from the battery cell destroy the second pressure relief area and the first pressure relief area respectively, when entering the exhaust channel, the first pressure relief area can shield at least a portion of the side wall of the exhaust channel to protect the side wall.

[0021] In some embodiments, the pressure relief mechanism is provided with a second pressure relief groove, and the pressure relief mechanism forms a second weak portion in the region where the second pressure relief groove is provided. The second pressure relief groove is provided to obtain a second weak portion that can be damaged.

[0022] In some embodiments, the second pressure relief groove includes a third section, the third section defines two second pressure relief areas, and the two second pressure relief areas are respectively arranged on opposite sides of the third section along the second direction; the second direction is perpendicular to the first direction. During the pressure relief process of the pressure relief mechanism, the two second pressure relief areas can rotate in a direction away from the battery cell, which, on the one hand, enables the emissions discharged from the battery cell through the pressure relief mechanism to be better discharged toward the exhaust channel. Compared with only one second pressure relief area, it can reduce the situation where the emissions contact more with the side wall of one side of the exhaust channel, thereby reducing the risk of the side wall of the exhaust channel being melted.

[0023] In some embodiments, the second pressure relief groove further includes two fourth sections spaced apart along the third direction, the third section is connected to the two fourth sections, and the third section and the fourth section define two second pressure relief areas; the first direction and the second direction are both perpendicular to the third direction. By defining the two second pressure relief areas by the third section and the two fourth sections, the second pressure relief area can be more easily destroyed when the pressure relief mechanism releases pressure, thereby quickly releasing the pressure inside the battery cell.

[0024] In some embodiments, the pressure relief mechanism is further provided with a second reversing groove, which is arranged at intervals from the third section along the second direction, and is configured to guide the second pressure relief area to open. The provision of the second reversing groove enables the second pressure relief area to be more easily reversible when the pressure relief mechanism is in a pressure relief state.

[0025] In some embodiments, the shielding member and the supporting member are integrally formed, which is helpful for overall production and manufacturing, thereby reducing assembly difficulty and production cost.

[0026] In some embodiments, the shielding member and the supporting member are separately provided, and the shielding member is provided between the supporting member and the battery cell. The shielding member and the supporting member are separately provided, which can make the production and assembly of the two more flexible.

[0027] In some embodiments, the battery cell further includes an electrode terminal and a shell, the shell includes a first wall and a second wall, the electrode terminal is located on the first wall, and the pressure relief mechanism is located on the second wall. The electrode terminal and the pressure relief mechanism are respectively located on different wall portions of the shell of the battery cell, which can reduce the impact of the pressure relief mechanism on the side where the electrode terminal is located when releasing pressure.

[0028] In some embodiments, the battery device further comprises a box body, the box body comprises a plurality of box walls, the plurality of box walls together define a storage space, the battery cell is at least partially located in the storage space; the support is at least partially located in the storage space, and is connected to at least one box wall. The support and the box body are separately arranged, and by arranging an exhaust channel and a shielding member on the support, while carrying the battery cell, when the pressure relief mechanism of the battery cell releases pressure, the discharge of the battery cell can also be collected and diverted.

[0029] In other embodiments, the battery row device includes a box body, the box body includes a plurality of box walls, the plurality of box walls together define a storage space, the battery cell is at least partially located in the storage space; the plurality of box walls include a bottom wall located at the bottom of the battery cell, and the support member is the bottom wall. The support member is a part of the box body, the box body directly supports the battery cell, and when the pressure relief mechanism of the battery cell releases pressure, it can also collect and guide the discharge of the battery cell.

[0030] In some embodiments, the shielding member is made of steel. Steel has the characteristics of high strength and high melting point, which can reduce the risk of melting when the pressure relief mechanism releases pressure, thereby improving the overall reliability of the battery device.

[0031] In a second aspect, an embodiment of the present application provides an electrical device, comprising a battery device provided by any embodiment of the first aspect.

[0032] 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

[0033] 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.

[0034] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0035] Figure 2 A schematic diagram of the exploded structure of a battery device according to some embodiments of the present application;

[0036] Figure 3 A schematic diagram of the connection structure between a battery cell and a busbar in some embodiments of the present application;

[0037] Figure 4 A schematic diagram of the exploded structure of a battery cell according to some embodiments of the present application;

[0038] Figure 5 A schematic diagram of the structure of a battery device according to some embodiments of the present application;

[0039] Figure 6 A front view of a battery device according to some embodiments of the present application;

[0040] Figure 7 A schematic diagram of the structure of a battery device when the pressure relief mechanism of some embodiments of the present application releases pressure;

[0041] Figure 8 This is a schematic diagram of the structure of a shielding member in some embodiments of the present application;

[0042] Fig. 9 Schematic diagram of the structure of shielding members in other embodiments of the present application;

[0043] Fig.10 Schematic diagrams of the structures of battery devices according to some other embodiments of the present application;

[0044] Fig.11 for Fig.10 A local enlarged view at point A;

[0045] Fig.12 This is a schematic diagram of the structure of a battery cell in some embodiments of the present application;

[0046] Fig.13 for Fig.12 A local enlarged view at point B;

[0047] Fig.14 Schematic diagrams of the structures of battery devices in other embodiments of the present application;

[0048] Fig.15 It is a schematic diagram of the structure of the battery device of some other embodiments of the present application;

[0049] Fig.16 It is a schematic diagram of a partially exploded structure of a battery device according to some embodiments of the present application.

[0050] icon:

[0051] 1000-vehicle; 100-battery device; 200-controller; 300-motor; 10-box; 11-first box; 12-second box; 20-battery cell; 201-electrode terminal; 202-housing; 2021-housing; 2022-end cover; 2023-first wall; 2024-second wall; 203-electrode assembly; 204-pressure relief mechanism; 2041-second pressure relief groove; 20411-third section; 204 12-fourth section; 2042-second pressure relief zone; 2043-second reversing groove; 30-support member; 301-exhaust channel; 3011-side wall; 40-shielding member; 401-first pressure relief groove; 4011-first section; 4012-second section; 402-first pressure relief zone; 403-first reversing groove; 404-first surface; 405-second surface; 50-confluence member; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0052] 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 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.

[0053] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings 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.

[0054] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0055] 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.

[0056] 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.

[0057] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0058] The term “plurality” used in this application refers to two or more (including two).

[0059] 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.

[0060] Battery cells include, 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-acid batteries, and the like.

[0061] 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 the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to reduce the risk of short circuit between the positive and negative electrodes, while allowing active ions to pass through.

[0062] 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.

[0063] 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.

[0064] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, nickel, carbon electrode, carbon or titanium, etc. 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.).

[0065] 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 traditional materials that can be used as positive electrode active materials for battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622 )、LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and its modified compounds, etc.

[0066] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0067] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0068] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, nickel, carbon electrode, carbon or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. 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 (copper, copper 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.).

[0069] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0070] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0071] 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.

[0072] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0073] In some embodiments, the separator is a separator membrane, which can be any known porous separator membrane with good chemical stability and mechanical stability.

[0074] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0075] 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.

[0076] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0077] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0078] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0079] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0080] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0081] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0082] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0083] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

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

[0085] In some embodiments, the electrode assembly is a laminate structure.

[0086] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0087] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0088] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded sections.

[0089] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0090] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0091] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0092] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] 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.

[0094] As an example, the battery cell may 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 cell, such as a hexagonal battery cell.

[0095] The battery apparatus 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 multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar.

[0096] In some embodiments, a 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.

[0097] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0098] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0099] 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.

[0100] 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.

[0101] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0102] As an example, the box body 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 to accommodate the battery cell assembly.

[0103] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0104] In some embodiments, the battery device refers to an energy storage device, which includes a box body, at least one side of which is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, and the like.

[0105] In battery technology, a pressure relief mechanism can be set in a battery cell to improve the reliability of the battery cell. For example, when a short circuit or overcharge occurs in a battery device, thermal runaway may occur inside the battery cell, causing a sudden increase in pressure or temperature. In this case, the pressure relief mechanism can release the internal pressure and temperature to the outside to reduce the probability of explosion or fire in the battery cell.

[0106] In the scenario where a pressure relief mechanism is set, the emissions discharged through the pressure relief mechanism may cause short circuits in the remaining battery cells. For example, when the discharged metal chips electrically connect two converging components, it will cause a short circuit in the battery, thus posing a safety hazard. In addition, high-temperature and high-pressure emissions are discharged in the direction of the pressure relief mechanism set in the battery cell, and can be discharged in the direction of the area where the pressure relief mechanism is actuated. Such emissions are very powerful and destructive, and may even damage one or more structures in that direction, causing further safety problems. In this case, an exhaust channel can be set up to collect and direct the emissions discharged by the pressure relief mechanism.

[0107] In the scenario where an exhaust channel is provided, the temperature of the exhaust discharged from the battery cells through the pressure relief mechanism may be high, and a large amount of exhaust may cause the side wall of the exhaust channel to melt.

[0108] In view of this, an embodiment of the present application provides a battery device, including a battery cell, a support member and a shielding member. The battery cell includes a pressure relief mechanism, the support member is configured to support the battery cell along a first direction, the pressure relief mechanism is arranged toward the support member along the first direction, and the support member has an exhaust channel. The shielding member is arranged between the pressure relief mechanism and the exhaust channel to separate the pressure relief mechanism and the exhaust channel; the shielding member is configured to be able to be opened when the pressure relief mechanism releases pressure, and covers at least a portion of the side wall of the exhaust channel.

[0109] In such a battery device, a shielding member is provided in the battery device, and the shielding member can play the role of separating the pressure relief mechanism and the exhaust channel, and when the pressure relief mechanism releases pressure, the shielding member is impacted and can be opened, so that the emissions discharged from the battery cell through the pressure relief mechanism can flow from the area where the shielding member is originally located to the exhaust channel. After being opened, the shielding member can also cover at least a part of the side wall of the exhaust channel, which can make it difficult for the emissions discharged from the battery cell through the pressure relief mechanism to directly contact the area of ​​the side wall of the exhaust channel covered by the shielding member, thereby reducing the risk of the side wall of the exhaust channel being melted, so as to improve the overall reliability of the battery device.

[0110] The technical solutions described in the embodiments of the present application are applicable to various electrical devices using battery cells and battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0111] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0112] Please refer to Figure 1 , Figure 1 The schematic diagram of the structure of the vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 is provided with a battery device 100 inside, and the battery device 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000.

[0113] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery device 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0114] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0115] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of a battery device 100 according to some embodiments of the present application. The battery device 100 may include a battery cell 20 and a box 10 . The box 10 is used to accommodate the battery cell 20 .

[0116] Among them, a closed space for accommodating the battery cell 20 is formed inside the box 10, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first box 11 and a second box 12, and the first box 11 and the second box 12 are buckled with each other. The first box 11 and the second box 12 can be in various shapes, such as a cuboid, a cylinder, etc. The first box 11 can be a hollow structure with one side open, and the second box 12 can also be a hollow structure with one side open. The open side of the second box 12 is buckled with the open side of the first box 11 to form a box 10 with a closed space. It is also possible that the first box 11 is a hollow structure with one side open, and the second box 12 is a plate-like structure. The second box 12 is buckled on the open side of the first box 11, so as to form a box 10 with a accommodating space.

[0117] In the battery device 100, there may be one or more battery cells 20. If there are more than one battery cell 20, the battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the battery cells 20 are connected in series and in parallel. A battery module may be formed by connecting a plurality of battery cells 20 in series, in parallel, or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole and accommodated in the box 10. Alternatively, all the battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by all the battery cells 20 is accommodated in the box 10.

[0118] In some embodiments, please refer to Figure 3 , Figure 3 The schematic diagram of the connection structure between the battery cell 20 and the busbar 50 of some embodiments of the present application, the battery device 100 may further include a busbar 50, and multiple battery cells 20 may be electrically connected through the busbar 50 to achieve series connection, parallel connection or mixed connection of multiple battery cells 20. The busbar 50 may be a metal conductor, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0119] In some embodiments, please refer to Figure 4 , Figure 4 This is a schematic diagram of the exploded structure of a battery cell 20 in some embodiments of the present application. The battery cell 20 may include a housing 202 and an electrode assembly 203 , wherein the electrode assembly 203 is accommodated in the housing 202 .

[0120] In some embodiments, the housing 202 may include a shell 2021 and an end cap 2022, wherein the shell 2021 has an opening, and the end cap 2022 closes the opening of the shell 2021. The closing here means covering or closing, which may be sealed or unsealed.

[0121] The shell 2021 is a component for accommodating the electrode assembly 203. The shell 2021 may be a hollow structure with an opening formed at one end, or a hollow structure with openings formed at opposite ends. The shell 2021 may be in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, etc. The material of the shell 2021 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The electrode assembly 203 may be partially located in the shell 2021, or may be completely located in the shell 2021.

[0122] The end cap 2022 and the shell 2021 together define a receiving space for accommodating the electrode assembly 203 and other components. The end cap 2022 can be connected to the shell 2021 by welding, crimping, etc. to close the opening of the shell 2021. The shape of the end cap 2022 can be adapted to the shape of the shell 2021. For example, the shell 2021 is a rectangular parallelepiped structure, and the end cap 2022 is a rectangular plate structure adapted to the shell 2021. For another example, the shell 2021 is a cylindrical structure, and the end cap 2022 is a circular plate structure adapted to the shell 2021. The material of the end cap 2022 can also be a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 2022 and the shell 2021 can be the same or different.

[0123] In the embodiment where the housing 2021 is opened at one end, one end cap 2022 may be provided. In the embodiment where the housing 2021 is opened at two opposite ends, two end caps 2022 may be provided, and the two end caps 2022 respectively close the two openings of the housing 2021, and the two end caps 2022 and the housing 2021 together define a receiving space.

[0124] In some embodiments, the battery cell 20 may further include an electrode terminal 201, which is disposed on the housing 202, and is used to electrically connect to the tab of the electrode assembly 203 to input or output the electrical energy of the battery cell 20. The electrode terminal 201 may be disposed on the shell 2021 of the housing 202, or on the end cover 2022 of the housing 202. Electrode terminals 201 of different polarities of a battery cell 20 may be disposed on the same side of the housing 202, or on different sides of the housing 202. The electrode terminal 201 and the tab may be directly connected, for example, the electrode terminal 201 and the tab are welded. The electrode terminal 201 and the tab may also be indirectly connected, for example, the electrode terminal 201 and the tab are indirectly connected through a current collecting member. The current collecting member may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0125] As an example, in Figure 4 In the illustrated embodiment, an opening is formed at one end of the shell 2021, and there is one end cap 2022 in the shell 202, and one end cap 2022 closes one opening of the shell 2021. Two electrode terminals 201 are provided on the end cap 2022, and the two electrode terminals 201 are respectively a positive electrode terminal 201 and a negative electrode terminal 201. A positive electrode tab and a negative electrode tab are formed at one end of the electrode assembly 203 facing the end cap 2022, and the positive electrode terminal 201 is electrically connected to the positive electrode tab, and the negative electrode terminal 201 is electrically connected to the negative electrode tab.

[0126] See also Figure 5-Figure 7 , Figure 5 A schematic diagram of the structure of a battery device 100 according to some embodiments of the present application; Figure 6 A front view of a battery device 100 according to some embodiments of the present application; Figure 7 This is a schematic diagram of the structure of the battery device 100 when the pressure relief mechanism 204 of some embodiments of the present application releases pressure. The embodiment of the present application provides a battery device 100, including a battery cell 20, a support member 30 and a shielding member 40. The battery cell 20 includes a pressure relief mechanism 204, and the support member 30 is configured to support the battery cell 20 along a first direction X. Along the first direction X, the pressure relief mechanism 204 is arranged toward the support member 30, and the support member 30 has an exhaust channel 301. The shielding member 40 is arranged between the pressure relief mechanism 204 and the exhaust channel 301 to separate the pressure relief mechanism 204 and the exhaust channel 301; the shielding member 40 is configured to be able to be opened when the pressure relief mechanism 204 releases pressure, and covers at least a portion of the side wall 3011 of the exhaust channel.

[0127] The pressure relief mechanism 204 is an element or component that releases pressure to release the internal pressure or temperature when the internal pressure or temperature or other conditions of the battery cell 20 reaches a predetermined threshold. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and isolation membrane in the battery cell 20. The pressure relief mechanism 204 can take the form of an explosion-proof valve, an air valve, a pressure relief valve or a safety valve, and can specifically adopt a pressure-sensitive or temperature-sensitive element or structure, that is, when the internal pressure or temperature or other conditions of the battery cell 20 reaches a predetermined threshold, the pressure relief mechanism 204 performs an action or a weak structure provided in the pressure relief mechanism 204 is destroyed, thereby forming an opening or channel for internal pressure or temperature release. Generally, the melting point and / or thickness of the weak structure are lower than other areas of the pressure relief mechanism 204. For example, the weak structure can be a notched groove set on the surface of the pressure relief mechanism 204.

[0128] The "pressure relief" mentioned in this application refers to the action of the pressure relief mechanism 204 or its activation to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The action produced by the pressure relief mechanism 204 may include, but is not limited to: at least a part of the pressure relief mechanism 204 is broken, shattered, torn or opened, etc. The pressure relief of the pressure relief mechanism 204 can also be referred to as the opening of the pressure relief mechanism 204. When the pressure relief mechanism 204 is releasing pressure, the high-temperature and high-pressure substances inside the battery cell 20 will be discharged from the pressure relief site as emissions. In this way, the battery cell 20 can be depressurized and cooled under controllable pressure or temperature, thereby avoiding potential more serious accidents.

[0129] The shape of the pressure relief mechanism 204 may include but is not limited to a circle, an ellipse, a polygon, a waist shape, etc. The shape of the pressure relief mechanism 204 may be a shape with a certain degree of symmetry or an asymmetric shape.

[0130] The pressure relief mechanism 204 may be a pressure relief component installed on the housing 202 , or the pressure relief mechanism 204 may be integrally formed with the end cover 2022 or the shell 2021 of the housing 202 .

[0131] The support member 30 can provide support for the battery cell 20. In some examples, the support member 30 can be provided separately, for example, the support member 30 can be connected to the box 10 of the battery device 100 and support the battery cell 20; the support member 30 can also be a part of the box 10, such as one of the walls of the box 10, or a part extending from the box 10. The support member 30 can be a flat plate structure, and the support member 30 supports the battery cell 20 based on a side plane; the support member 30 can also be a slotted structure, and a receiving space is formed based on the slot, and then the battery cell 20 is placed in the receiving space to achieve the support of the battery cell 20 by the support member 30.

[0132] The support member 30 has an exhaust passage 301, and the pressure relief mechanism 204 is disposed toward the support member 30. When the pressure relief mechanism 204 releases the pressure inside the battery cell 20, the exhaust is discharged toward the area where the support member 30 is located, and can be discharged into the exhaust passage 301 after the shielding member 40 is opened. In some examples, when there are multiple battery cells 20, the multiple battery cells 20 can correspond to one exhaust passage 301, that is, the exhaust of multiple battery cells 20 can be discharged into one exhaust passage 301.

[0133] The pressure relief mechanism 204 includes a normal state and a pressure relief state. When the pressure relief mechanism 204 is in the normal state, the shielding member 40 is disposed between the pressure relief mechanism 204 and the exhaust passage 301 to separate the pressure relief mechanism 204 and the exhaust passage 301. When the pressure relief mechanism 204 is in the pressure relief state, the shielding member 40 can be opened to allow the exhaust gas discharged from the battery cell 20 through the pressure relief mechanism 204 to be discharged into the exhaust passage 301. In addition, when the pressure relief mechanism 204 is in the pressure relief state, the shielding member 40 itself covers at least a portion of the side wall 3011 of the exhaust passage 301.

[0134] In the above embodiment, the battery device 100 is provided with a shielding member 40, which can play the role of separating the pressure relief mechanism 204 and the exhaust channel 301, and when the pressure relief mechanism 204 releases pressure, the shielding member 40 is impacted and can be opened, so that the exhaust discharged from the battery cell 20 through the pressure relief mechanism 204 can flow from the area where the shielding member 40 is originally located to the exhaust channel 301. After being opened, the shielding member 40 can also cover at least a part of the side wall 3011 of the exhaust channel 301, so that the exhaust discharged from the battery cell 20 through the pressure relief mechanism 204 is difficult to directly contact the area of ​​the side wall 3011 of the exhaust channel 301 covered by the shielding member 40, thereby reducing the risk of the side wall 3011 of the exhaust channel 301 being melted, so as to improve the overall reliability of the battery device 100.

[0135] In some embodiments, still refer to Figure 5-Figure 7 There are multiple battery cells 20, and the support member 30 has multiple exhaust channels 301 arranged along the second direction Y, and each exhaust channel 301 is arranged corresponding to at least one battery cell 20. Among them, the side wall 3011 of the exhaust channel 301 includes two side surfaces arranged oppositely along the second direction Y, and the shielding member 40 is configured to cover at least a portion of at least one side surface when the pressure relief mechanism 204 releases pressure. The second direction Y is perpendicular to the first direction X.

[0136] In a battery device in which a plurality of battery cells 20 are arranged, there may be a plurality of exhaust channels 301 , and any exhaust channel 301 may be used to collect and directionally discharge the exhaust discharged from at least one battery cell 20 through its pressure relief mechanism 204 .

[0137] The exhaust channel 301 is arranged correspondingly to at least one battery cell 20, and the corresponding arrangement means that the exhaust discharged by the battery cell 20 through its pressure relief mechanism 204 can flow into the exhaust channel 301. In some examples, one exhaust channel 301 may correspond to one battery cell 20, or may correspond to two battery cells 20, or may correspond to more battery cells 20.

[0138] When the support member 30 has multiple exhaust channels 301, two adjacent exhaust channels 301 may be arranged at intervals. For any exhaust channel 301, it may be extended along the third direction Z. In this arrangement, the first direction X and the second direction Y are both perpendicular to the third direction Z.

[0139] The exhaust channel 301 may include only two side surfaces that are arranged opposite to each other. The exhaust channel 301 is described by taking the extension direction of the exhaust channel 301 as the third direction Z. The exhaust channel 301 is opened on two opposite sides of the extension direction. In this case, the exhaust channel 301 includes only two side surfaces that are arranged opposite to each other along the second direction Y. The exhaust channel 301 may also include four side surfaces. For example, the exhaust channel 301 is closed on two opposite sides of the extension direction. In this case, the exhaust channel 301 includes two large surfaces that are arranged opposite to each other along the second direction Y, and two small surfaces that are arranged opposite to each other along the third direction Z.

[0140] In the above embodiment, multiple exhaust channels 301 on the support member 30 are arranged along the second direction Y. When the pressure relief mechanism 204 releases pressure, the shielding member 40 covers at least a portion of at least one side surface. It is difficult for the exhaust gas discharged from the battery cell 20 through the pressure relief mechanism 204 to directly contact the area of ​​the side wall 3011 of the exhaust channel 301 covered by the shielding member 40, thereby reducing the risk of the side wall 3011 of the exhaust channel 301 being melted, so that when the battery cell 20 thermally runs away, it is difficult to affect the battery cells 20 corresponding to other exhaust channels 301, thereby improving the overall reliability of the battery device 100.

[0141] In some embodiments, see Figure 8 , Figure 8 This is a structural schematic diagram of the shielding member 40 of some embodiments of the present application, wherein the shielding member 40 is provided with a first weak portion, which defines at least one first pressure relief area 402, and the first pressure relief area 402 is arranged relative to the pressure relief mechanism 204 along the first direction X. The first pressure relief area 402 is configured to be able to be flushed open when the pressure relief mechanism 204 releases pressure, and to cover at least a portion of the side wall 3011 of the exhaust channel 301.

[0142] The first weak portion may be a groove of a certain depth provided on the surface of the shielding member 40; or it may be a notch formed by providing a plurality of through holes spaced apart on the shielding member 40; or it may be a material with a lower strength than other areas provided in the area where the first weak portion is located to form the first weak portion. When the shielding member 40 is impacted, the area where the first weak portion is located may be damaged preferentially compared to other areas. Exemplarily, when the pressure relief mechanism 204 is in the pressure relief state, when the exhaust discharged from the battery cell 20 through the pressure relief mechanism 204 impacts the shielding member 40, the shielding member 40 will be damaged preferentially in the area where the first weak portion is located, so that the shielding member 40 originally provided between the pressure relief mechanism 204 and the exhaust channel 301 is opened.

[0143] When the shielding member 40 is impacted, the first weak portion is damaged, so that at least part of the shielding member 40 is bent or falls off, and the bent or fallen part can be considered as the first pressure relief area 402. The first pressure relief area 402 is arranged relative to the pressure relief mechanism 204 along the first direction X, so that the discharge discharged from the battery cell 20 through the pressure relief mechanism 204 can impact the area where the first pressure relief area 402 is located. After the first pressure relief area 402 is impacted, it is bent or fallen off, so that the discharge of the battery cell 20 through the pressure relief mechanism 204 is discharged into the exhaust channel 301. When the first pressure relief area 402 is bent or falls off, it can bend or move toward the side wall 3011 of the exhaust channel 301 to cover at least a part of the side wall 3011 of the exhaust channel 301.

[0144] In the above embodiment, the first weak portion is provided to obtain the first pressure relief area 402 which can be opened and covers at least a portion of the side wall 3011 of the exhaust passage 301 .

[0145] In some embodiments, still refer to Figure 8 The shielding member 40 is provided with a first pressure relief groove 401 , and the shielding member 40 forms a first weak portion in the area where the first pressure relief groove 401 is provided.

[0146] The first pressure relief groove 401 can be formed by processing, etching, stamping, etc.

[0147] In the above embodiment, the first pressure relief groove 401 is provided to obtain a first weak portion that can be damaged.

[0148] In some embodiments, see Fig. 9 , Fig. 9The schematic diagram of the structure of the shielding member 40 of some other embodiments of the present application is as follows: the first pressure relief groove 401 includes a first section 4011, and the first pressure relief groove 401 defines two first pressure relief areas 402, and the two first pressure relief areas 402 are arranged on opposite sides of the first section 4011 along the second direction Y, and the second direction Y is perpendicular to the first direction X. The side wall 3011 of the exhaust channel 301 includes two side surfaces arranged opposite to each other along the second direction Y, and one first pressure relief area 402 is configured to cover at least a portion of one side surface when the pressure relief mechanism 204 releases pressure, and the other first pressure relief area 402 is configured to cover at least a portion of the other side surface when the pressure relief mechanism 204 releases pressure.

[0149] The two first pressure relief areas 402 located on opposite sides of the first section 4011 are the first weak part. When the pressure relief mechanism 204 releases pressure, the two first pressure relief areas 402 can flip in directions away from each other to achieve the purpose of being flushed open.

[0150] When there is only one first pressure relief zone 402, the first pressure relief zone 402 can only rotate along one side. At this time, the exhaust discharged from the battery cell 20 through the pressure relief mechanism 204 will contact more side walls 3011 of the exhaust channel 301. In this case, the risk of the impacted side wall 3011 being melted is greater.

[0151] In view of this, in the above embodiment, when the pressure relief mechanism 204 releases pressure, the two first pressure relief areas 402 can rotate in a direction away from the battery cell 20, so that the exhaust discharged from the battery cell 20 through the pressure relief mechanism 204 can be better discharged toward the exhaust channel 301, rather than only impacting the side wall 3011 on one side of the exhaust channel 301. Compared with only one first pressure relief area 402, it can reduce the situation where the exhaust contacts the side wall 3011 on one side of the exhaust channel 301, thereby reducing the risk of the side wall 3011 of the exhaust channel 301 being melted. On the other hand, the two first pressure relief areas 402 can respectively cover the two side surfaces of the exhaust channel 301 that are oppositely arranged along the second direction Y during the rotation process, and can protect at least a portion of the side walls 3011 on the opposite sides of the exhaust channel 301, further reducing the risk of the side walls 3011 of the exhaust channel 301 being melted.

[0152] In some embodiments, still refer to Fig. 9 The first pressure relief groove 401 also includes two second sections 4012 spaced apart in the third direction Z, the first section 4011 connects the two second sections 4012, the first section 4011 and the two second sections 4012 define two first pressure relief areas 402, and the first direction X and the second direction Y are both perpendicular to the third direction Z.

[0153] When the second segments 4012 include two, the two ends of the first segment 4011 may be connected to the non-end regions of the two second segments 4012, forming a shape similar to the letter "I". The two ends of the first segment 4011 may be connected to the end regions of the two second segments 4012, forming a shape similar to the letter "Z". One end of the first segment 4011 may be connected to an end point of one second segment 4012, and the other end of the first segment 4011 may be connected to the non-end region of another second segment 4012.

[0154] In the above embodiment, two first pressure relief areas 402 are defined by providing the first section 4011 and the two second sections 4012 , so that the first pressure relief areas 402 can be more easily destroyed when the pressure relief mechanism 204 releases pressure, thereby quickly releasing the pressure inside the battery cell 20 .

[0155] In some embodiments, still refer to Fig. 9 The shielding member 40 is also provided with a first flip groove 403. Along the second direction Y, the first flip groove 403 is spaced apart from the first section 4011. The first flip groove 403 is configured to guide the first pressure relief area 402 to flip and cover at least a portion of the side wall of the exhaust channel 301.

[0156] The first reversal groove 403 may be a groove of a certain depth provided on the surface of the shielding member 40, so that the shielding member 40 forms a weak area in the area where the first reversal groove 403 is located. Compared with the first pressure relief groove 401, the groove depth of the first reversal groove 403 may be lower than the groove depth of the first pressure relief groove 401, so that when the shielding member 40 is impacted, the area where the first pressure relief groove 401 is located is more prone to damage than the area where the first reversal groove 403 is located. It may also be that when both the first reversal groove 403 and the first pressure relief groove 401 are notched, the spacing between adjacent through holes of the first reversal groove 403 is greater than the spacing between adjacent through holes of the first pressure relief groove 401. It may also be that the material strength of the first reversal groove 403 is higher than the material strength of the first pressure relief groove 401.

[0157] In this embodiment, the first reversing groove 403 is provided so that the first pressure relief area 402 can be reversed along a preset direction when the shielding member 40 is impacted. Exemplarily, when the shielding member 40 is impacted, the shielding member 40 is broken along the first pressure relief groove 401 and reversed along the first reversing groove 403 as a rotation axis to cover at least a portion of the side wall 3011 of the exhaust passage 301.

[0158] In some embodiments, see Fig.10 , Fig.10The schematic diagram of the structure of the battery device 100 of some other embodiments of the present application shows that the size of the first pressure relief area 402 along the second direction Y is d1, and the size of the exhaust channel 301 along the first direction X is d2, and d1≥d2. Through this arrangement, when the pressure relief mechanism 204 releases pressure and the first pressure relief area 402 turns away from the battery cell 20, the side wall 3011 of the exhaust channel 301 can be covered as a whole, so as to better protect the side wall 3011 of the exhaust channel 301, thereby reducing the risk of the side wall 3011 of the exhaust channel 301 being melted.

[0159] In some embodiments, still refer to Fig.10 , and see further Fig.11 , Fig.11 for Fig.10 In the partial enlarged view at A, along the first direction X, the shielding member 40 has a first surface 404 and a second surface 405 opposite to each other, and the first surface 404 and / or the second surface 405 is provided with a first pressure relief groove 401 .

[0160] The first surface 404 and the second surface 405 may both be provided with the first pressure relief groove 401. Exemplarily, the first surface 404 and the second surface 405 are provided with the first pressure relief groove 401 opposite to each other, and the projections of the first pressure relief groove 401 provided on the first surface 404 and the first pressure relief groove 401 provided on the second surface 405 may overlap in the projection plane perpendicular to the first direction X. The first pressure relief groove 401 may also be provided on the first surface 404 or the second surface 405.

[0161] In the above embodiment, the shielding member 40 can be more easily damaged when the pressure relief mechanism 204 releases pressure, thereby quickly releasing the pressure inside the battery cell 20 .

[0162] In some embodiments, please refer back to Figure 8 , the shielding member 40 is also provided with a first reversing groove 403, and the first reversing groove 403 is configured to guide the first pressure relief zone 402 to reverse and cover at least a portion of the side wall 3011 of the exhaust channel 301. In this embodiment, the shielding member 40 is provided with the first reversing groove 403 when the first pressure relief groove 401 is provided, so as to guide the first pressure relief zone 402 to reverse. Exemplarily, the first pressure relief groove 401 can be provided in an arc shape, and the first reversing groove 403 is connected to the opposite ends of the arc shape; for another example, the first pressure relief groove 401 and the first reversing groove 403 can be enclosed to form a triangular structure, and the first reversing groove 403 can be one of the sides; for another example, the first pressure relief groove 401 and the first reversing groove 403 can be enclosed to form a circle or a quasi-circle. Both can realize that the first reversing groove 403 guides the first pressure relief zone 402 to reverse and cover at least a portion of the side wall 3011 of the exhaust channel 301.

[0163] In some embodiments, still refer to Fig.10 and Fig.11 , along the first direction X, the shielding member 40 has a first surface 404 facing the battery cell 20, and the first flip groove 403 is arranged on the first surface 404. Based on this arrangement, during the flipping process of the first pressure relief area 402, the interference between the first pressure relief area 402 and other areas of the shielding member 40 can be reduced, so that the first pressure relief area 402 can be flipped more easily, thereby quickly releasing the pressure inside the battery cell 20.

[0164] In some embodiments, see Fig.12 and Fig.13 , Fig.12 This is a schematic diagram of the structure of a battery cell 20 in some embodiments of the present application; Fig.13 for Fig.12 A partial enlarged view at B. The pressure relief mechanism 204 is provided with a second weak portion, which defines at least one second pressure relief area 2042, which is arranged opposite to the first pressure relief area 402 along the first direction X, and is configured to be opened when the second weak portion is damaged.

[0165] The second weak part can be a groove of a certain depth set on the surface of the pressure relief mechanism 204; it can also be a plurality of through holes set at intervals on the pressure relief mechanism 204 to form a notch; it can also be a material with lower strength than other areas in the area where the second weak part is located, so that the pressure relief mechanism 204 forms a weak area in the area where the second weak part is located. When the pressure relief mechanism 204 is impacted, the area where the second weak part is located can be damaged first compared to other areas.

[0166] The second pressure relief area 2042 is at least a part of the pressure relief mechanism 204. When the pressure relief mechanism 204 releases pressure, the second pressure relief area 2042 can be opened so that the exhaust of the battery device 100 is discharged through the area where the second pressure relief area 2042 is originally located. The second pressure relief area 2042 is arranged opposite to the first pressure relief area 402 along the first direction X. After destroying the second pressure relief area 2042, the exhaust of the battery device 100 can impact toward the first pressure relief area 402, so that after the first pressure relief area 402 is destroyed, the exhaust of the battery device 100 can enter the exhaust channel 301.

[0167] In the above embodiment, when the battery cell 20 is in a normal state (i.e., the pressure relief mechanism 204 is not in a pressure relief state), the second pressure relief area 2042 can block the inside and outside of the battery cell 20; when the battery cell 20 is in an abnormal state and needs to be pressure-relieved through the pressure relief mechanism 204, the second weak portion is destroyed to support the release of the pressure inside the battery cell 20. By arranging the second pressure relief area 2042 and the first pressure relief area 402 opposite to each other, after the emissions discharged from the battery cell 20 destroy the second pressure relief area 2042 and the first pressure relief area 402 respectively, when entering the exhaust channel 301, the first pressure relief area 402 can shield at least a portion of the side wall 3011 of the exhaust channel 301, thereby protecting the side wall 3011.

[0168] In some embodiments, still refer to Fig.12 and Fig.13 The pressure relief mechanism is provided with a second pressure relief groove 2041 , and the pressure relief mechanism 204 forms a second weak portion in the area where the second pressure relief groove 2041 is provided.

[0169] The second pressure relief groove 2041 can be formed by processing, etching, stamping, etc.

[0170] In the above embodiment, the second pressure relief groove 2041 is provided to obtain a second weak portion that can be damaged.

[0171] In some embodiments, still refer to Fig.12 and Fig.13 The second pressure relief groove 2041 includes a third section 20411, and the third section 20411 defines two second pressure relief areas 2042. The two second pressure relief areas 2042 are respectively arranged on opposite sides of the third section 20411 along the second direction Y, and the second direction Y is perpendicular to the first direction X. During the pressure relief process of the pressure relief mechanism 204, the two second pressure relief areas 2042 can rotate in a direction away from the battery cell 20, so that the exhaust discharged from the battery cell 20 through the pressure relief mechanism 204 can be better discharged toward the exhaust channel 301. Compared with only one second pressure relief area 2042, it can reduce the situation where the exhaust contacts the side wall 3011 of the exhaust channel 301 more, thereby reducing the risk of the side wall 3011 of the exhaust channel 301 being melted.

[0172] In some embodiments, still refer to Fig.12 and Fig.13 The second pressure relief groove 2041 also includes two fourth sections 20412 spaced apart along the third direction Z, the third section 20411 is connected to the two fourth sections 20412, the third section 20411 and the fourth section 20412 define two second pressure relief areas 2042, and the first direction X and the second direction Y are both perpendicular to the third direction Z.

[0173] The fourth segment 20412 includes two segments, and the two ends of the third segment 20411 can be connected to the non-end regions of the two fourth segments 20412, forming a shape similar to the letter "I". The two ends of the third segment 20411 can also be connected to the end regions of the two fourth segments 20412, forming a shape similar to the letter "Z". One end of the third segment 20411 can also be connected to an end point of one fourth segment 20412, and the other end of the third segment 20411 can be connected to the non-end region of another fourth segment 20412.

[0174] In this embodiment, two second pressure relief areas 2042 are defined by providing the third section 20411 and two fourth sections 20412 , so that the second pressure relief areas 2042 can be more easily destroyed when the pressure relief mechanism 204 releases pressure, thereby quickly releasing the pressure inside the battery cell 20 .

[0175] In some embodiments, still refer to Fig.12 and Fig.13 The pressure relief mechanism 204 is further provided with a second reversing groove 2043, which is spaced apart from the third section 20411 along the second direction Y, and the second reversing groove 2043 is configured to guide the second pressure relief area 2042 to open. The provision of the second reversing groove 2043 enables the second pressure relief area 2042 to be more easily reversed when the pressure relief mechanism 204 is in a pressure relief state.

[0176] In some embodiments, please refer back to Fig.10 and Fig.11 , the shielding member 40 and the supporting member 30 are integrally formed.

[0177] It can be understood that the shielding member 40 and the supporting member 30 are two parts of the same component.

[0178] In this embodiment, the shielding member 40 and the supporting member 30 are integrally formed, which facilitates overall production and manufacturing, thereby reducing assembly difficulty and reducing production costs.

[0179] In some embodiments, see Fig.14 , Fig.14 It is a schematic structural diagram of a battery device 100 according to some other embodiments of the present application. The shielding member 40 and the supporting member 30 are provided separately, and the shielding member 40 is provided between the supporting member 30 and the battery cell 20 .

[0180] The shielding member 40 may be a metal member, such as iron, copper, steel, etc. The shielding member 40 may also be an insulating member.

[0181] As an example, the shielding member 40 is a plate-shaped member disposed between the support member 30 and the battery cell 20 .

[0182] The shielding member 40 and the support member 30 are separately provided, which can make the production and assembly of the two more flexible. For example, when the material or shape of the support member 30 is not suitable for the production of the shielding member 40, the shielding member 40 and the support member 30 can be separately provided. In another example, for the support member 30 that has been produced, if further processing of the shielding member 40 will increase the processing difficulty and increase the production cost, the shielding member 40 and the support member 30 can be separately provided.

[0183] In some embodiments, see Fig.15 , Fig.15 This is a structural schematic diagram of a battery device 100 of some other embodiments of the present application. The battery cell 20 also includes an electrode terminal 201 and a shell 202. The shell 202 includes a first wall 2023 and a second wall 2024. The electrode terminal 201 is located on the first wall 2023, and the pressure relief mechanism 204 is located on the second wall 2024.

[0184] When the pressure relief mechanism 204 releases pressure, if the discharged metal objects are adsorbed on the side where the electrode terminal 201 is located, it is easy to cause overlapping between the conductive parts on this side, causing the battery cell 20 to short-circuit. This situation will further deteriorate the condition of the battery cell 20, thereby further reducing the overall reliability of the battery device 100.

[0185] In this embodiment, the electrode terminal 201 and the pressure relief mechanism 204 are respectively located on different walls of the housing 202 of the battery cell 20 , which can reduce the impact of the pressure relief mechanism 204 on the side where the electrode terminal 201 is located when releasing pressure.

[0186] In some embodiments, see Fig.16 , Fig.16 Schematic diagram of a partially exploded structure of a battery device 100 according to some embodiments of the present application. The battery device 100 further includes a box body 10. The box body 10 includes a plurality of box walls. The plurality of box walls together define a storage space. The battery cell 20 ( Fig.16 The support member 30 is at least partially located in the accommodation space, and the support member 30 is at least partially located in the accommodation space and connected to at least one box wall. The support member 30 and the box body 10 are separately arranged. By arranging the exhaust channel 301 and the shielding member 40 on the support member 30, while carrying the battery cell 20, when the pressure relief mechanism 204 of the battery cell 20 releases pressure, the discharge of the battery cell 20 can also be collected and diverted.

[0187] In other embodiments, the battery device 100 includes a box body 10, the box body 10 includes a plurality of box walls, the plurality of box walls together define a storage space, and the battery cell 20 is at least partially located in the storage space; the plurality of box walls include a bottom wall located at the bottom of the battery cell 20, and the support member 30 is the bottom wall. The support member 30 is a part of the box body 10, the box body 10 directly supports the battery cell 20, and when the pressure relief mechanism 204 of the battery cell 20 releases pressure, it can also collect and guide the discharge of the battery cell 20.

[0188] In some embodiments, the shielding member 40 is made of steel. Steel has the characteristics of high strength and high melting point, which can reduce the risk of melting when the pressure relief mechanism 204 releases pressure, thereby improving the overall reliability of the battery device 100.

[0189] In some embodiments of the present application, a battery device 100 is provided, including a battery cell 20, a support member 30, and a shielding member 40. There are multiple battery cells 20, and the battery cell 20 includes a shell 202, an electrode terminal 201, and a pressure relief mechanism 204. The shell 202 includes a first wall 2023 and a second wall 2024. The electrode terminal 201 is arranged on the first wall 2023, and the pressure relief mechanism 204 is arranged on the second wall 2024. The support member 30 is located at the bottom of the battery cell 20 to support the battery cell 20. The support member 30 has an exhaust channel 301. There are multiple exhaust channels 301, and the multiple exhaust channels 301 are arranged along the second direction Y. Each exhaust channel 301 is arranged corresponding to at least one battery cell 20, and the exhaust channel 301 includes two side surfaces arranged opposite to each other along the second direction Y. The shielding member 40 is provided with a first pressure relief groove 401 and a first reversing groove 403. The first pressure relief groove 401 includes a first section 4011 and two second sections 4012. The two second sections 4012 are arranged at intervals along the third direction Z. The two ends of the first section 4011 are respectively connected to the two second sections 4012. The first section 4011 and the two second sections 4012 define two first pressure relief areas 402. The first reversing groove 403 is arranged at intervals with the first section 4011 along the second direction Y. The formed first pressure relief area 402 is arranged opposite to the pressure relief mechanism 204 along the first direction X. Along the first direction X, the shielding member 40 has a first surface 404 facing the battery cell 20 and a second surface 405 away from the battery cell 20. The first surface 404 is provided with the first pressure relief groove 401 and the first reversing groove 403, and the second surface 405 is provided with the first pressure relief groove 401. The pressure relief mechanism 204 is provided with a second pressure relief groove 2041 and a second reversing groove 2043. The second pressure relief groove 2041 includes a third section 20411 and two fourth sections 20412. The two fourth sections 20412 are arranged at intervals along the third direction Z. The two ends of the third section 20411 are respectively connected to the two fourth sections 20412. The third section 20411 and the two fourth sections 20412 define two second pressure relief areas 2042. The second reversing groove 2043 is arranged at intervals with the second section 4012 along the second direction Y. The formed second pressure relief area 2042 is arranged opposite to the first pressure relief area 402 along the first direction X. The material of the shielding member 40 is steel.

[0190] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0191] The above embodiments are only used to illustrate the technical solution of the present application and are not used to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, characterized in that: include: Battery cells, including pressure relief mechanisms; A support member configured to support the battery cell along a first direction, wherein the pressure relief mechanism is disposed toward the support member along the first direction; The support member has an exhaust passage; a shielding member, disposed between the pressure relief mechanism and the exhaust passage, so as to separate the pressure relief mechanism and the exhaust passage; The shielding member is configured to be flushed open when the pressure relief mechanism releases pressure, and to cover at least a portion of the side wall of the exhaust passage.

2. The battery device according to claim 1, characterized in that: There are a plurality of battery cells, and the support member has a plurality of exhaust channels arranged along a second direction, each exhaust channel being arranged corresponding to at least one battery cell; the second direction is perpendicular to the first direction; Wherein, the side wall of the exhaust passage includes two side surfaces arranged opposite to each other along the second direction, and the shielding member is configured to cover at least a portion of at least one of the side surfaces when the pressure relief mechanism releases pressure.

3. The battery device according to claim 1, characterized in that: The shielding member is provided with a first weak portion, which defines at least one first pressure relief area. The first pressure relief area is arranged opposite to the pressure relief mechanism along the first direction. The first pressure relief area is configured to be able to be flushed open and cover at least a portion of the side wall of the exhaust channel when the pressure relief mechanism releases pressure.

4. The battery device according to claim 3, characterized in that: The shielding member is provided with a first pressure relief groove, and the shielding member forms the first weak portion in a region where the first pressure relief groove is provided.

5. The battery device according to claim 4, characterized in that: The first pressure relief groove includes a first section, the first pressure relief groove defines two first pressure relief areas, the two first pressure relief areas are respectively arranged on opposite sides of the first section along a second direction, and the second direction is perpendicular to the first direction; The side wall of the exhaust passage includes two side surfaces arranged opposite to each other along the second direction, one of the first pressure relief areas is configured to cover at least a portion of one of the side surfaces when the pressure relief mechanism releases pressure, and the other of the first pressure relief areas is configured to cover at least a portion of the other of the side surfaces when the pressure relief mechanism releases pressure.

6. The battery device according to claim 5, characterized in that: The first pressure relief groove also includes two second sections spaced apart along a third direction, the first section connects the two second sections, and the first section and the two second sections define two first pressure relief areas; the first direction and the second direction are both perpendicular to the third direction.

7. The battery device according to claim 5, characterized in that: The shielding member is further provided with a first reversing groove, which is spaced apart from the first section along the second direction, and is configured to guide the first pressure relief area to reverse and cover at least a portion of the side wall of the exhaust passage.

8. The battery device according to claim 5, characterized in that: A size of the first pressure relief area along the second direction is d1, a size of the exhaust passage along the first direction is d2, and d1≥d2.

9. The battery device according to claim 4, characterized in that: Along the first direction, the shielding member has a first surface and a second surface opposite to each other, and the first surface and / or the second surface is provided with the first pressure relief groove.

10. The battery device according to claim 3, characterized in that: The shielding member is further provided with a first flip groove, and the first flip groove is configured to guide the first pressure relief area to flip and cover at least a portion of the side wall of the exhaust passage.

11. The battery device according to claim 10, characterized in that: Along the first direction, the shielding member has a first surface facing the battery cell, and the first turnover groove is disposed on the first surface.

12. The battery device according to any one of claims 3 to 11, characterized in that: The pressure relief mechanism is provided with a second weak portion, the second weak portion defines at least one second pressure relief zone, the second pressure relief zone is arranged opposite to the first pressure relief zone along the first direction, and the second pressure relief zone is configured to be able to open when the second weak portion is destroyed.

13. The battery device according to claim 12, characterized in that: The pressure relief mechanism is provided with a second pressure relief groove, and the pressure relief mechanism forms the second weak portion in the area where the second pressure relief groove is provided.

14. The battery device according to claim 13, characterized in that: The second pressure relief groove includes a third section, the third section defines two second pressure relief areas, and the two second pressure relief areas are respectively arranged on opposite sides of the third section along a second direction; the second direction is perpendicular to the first direction.

15. The battery device according to claim 14, characterized in that: The second pressure relief groove also includes two fourth sections spaced apart along a third direction, the third section is connected to the two fourth sections, and the third section and the fourth section define two second pressure relief areas; the first direction and the second direction are both perpendicular to the third direction.

16. The battery device according to claim 14, characterized in that: The pressure relief mechanism is further provided with a second reversal groove. Along the second direction, the second reversal groove is spaced apart from the third section. The second reversal groove is configured to guide the second pressure relief area to open.

17. The battery device according to any one of claims 1 to 11, characterized in that: The shielding member and the supporting member are integrally formed.

18. The battery device according to any one of claims 1 to 11, characterized in that: The shielding member and the supporting member are arranged separately, and the shielding member is arranged between the supporting member and the battery cell.

19. The battery device according to any one of claims 1 to 11, characterized in that: The battery cell further includes an electrode terminal and a shell. The shell includes a first wall and a second wall. The electrode terminal is located on the first wall, and the pressure relief mechanism is located on the second wall.

20. The battery device according to any one of claims 1 to 11, characterized in that: The battery device also includes a box body, which includes a plurality of box walls. The plurality of box walls together define a storage space, and the battery cell is at least partially located in the storage space; the support member is at least partially located in the storage space and connected to at least one of the box walls.

21. The battery device according to any one of claims 1 to 11, characterized in that: The battery device comprises a box body, the box body comprises a plurality of box walls, the plurality of box walls together define a receiving space, and the battery cell is at least partially located in the receiving space; The plurality of box walls include a bottom wall located at the bottom of the battery cell, and the support member is the bottom wall.

22. The battery device according to any one of claims 1 to 11, characterized in that: The shielding member is made of steel.

23. An electrical device, characterized in that: A battery device comprising any one of claims 1-22.

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