Battery monomer, battery device, power utilization device and energy storage device

Abstract

The embodiment of the utility model provides a battery monomer, a battery device, a power utilization device and an energy storage device. The use performance of the battery monomer can be improved. The battery monomer comprises an electrode assembly, a shell, a pressure relief mechanism and a supporting plate assembly, the shell comprises a first containing space, the electrode assembly is contained in the first containing space, the shell is provided with a first wall, the first wall is provided with a pressure relief hole penetrating through the first wall, and the pressure relief hole is communicated with the first containing space; the pressure relief mechanism is contained in the pressure relief hole and connected to the shell. The supporting plate assembly is fixed to the space between the electrode assembly and the first wall and comprises a main body part and a supporting part, the supporting part is located on the side, away from the electrode assembly, of the main body part, an exhaust channel communicated with the pressure relief mechanism is formed between the main body part and the first wall, and the melting point of the material of the supporting part is larger than that of the material of the main body part.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, and more particularly to a battery monomer, a battery device, a power utilization device and an energy storage device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the development of battery technology, in addition to improving the electrical performance of the battery device, the safety problem is also a problem that cannot be ignored. For example, the structure inside the battery monomer falls off or shakes at high temperature. If the safety problem of the battery device cannot be guaranteed, the battery device cannot be used, which reduces the use performance of the battery device. Therefore, how to improve the use performance of the battery monomer has become a technical problem to be solved in the field. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery monomer, a battery device, a power utilization device and an energy storage device, which can improve the use performance of the battery monomer.

[0005] In a first aspect, the present application provides a battery monomer, comprising: an electrode assembly; a shell comprising a first accommodating space, the electrode assembly being accommodated in the first accommodating space, the shell having a first wall provided with a pressure relief hole penetrating through the first wall, the pressure relief hole being communicated with the first accommodating space; a pressure relief mechanism accommodated in the pressure relief hole and connected to the shell; a supporting plate assembly fixed in a space between the electrode assembly and the first wall, the supporting plate assembly comprising a main body part and a supporting part, the supporting part being located on a side of the main body part away from the electrode assembly, and the main body part and the first wall forming an exhaust passage communicated with the pressure relief mechanism; wherein the melting point of the material of the supporting part is greater than the melting point of the material of the main body part.

[0006] In the embodiments of the present application, the pressure relief mechanism is arranged to be accommodated in the pressure relief hole of the first wall, and the battery monomer further comprises a supporting plate assembly fixed in a space between the electrode assembly and the first wall, the supporting plate assembly comprising a main body part and a supporting part, the supporting part being located on a side of the main body part away from the electrode assembly, and the main body part and the first wall forming an exhaust passage communicated with the pressure relief mechanism, and the melting point of the material of the supporting part is greater than the melting point of the material of the main body part. In the case of thermal runaway of the battery monomer, the electrode assembly can be supported by the supporting part to reduce the influence on the exhaust function of the battery monomer, and the pressure relief performance of the battery monomer and the structural strength of the supporting plate assembly are taken into account, thereby improving the use performance of the battery monomer.

[0007] In some embodiments, the material of the support portion has a melting point greater than or equal to 200°C. In this way, in the embodiments of the present application, by setting the melting point of the material of the support portion to be greater than or equal to 200°C, in the case of thermal runaway of the battery cell, the electrode assembly can be effectively supported by the support portion to reduce the impact on the exhaust function of the battery cell, improve the pressure relief performance of the battery cell and the structural strength of the support plate assembly, and thus improve the use performance of the battery cell.

[0008] In some embodiments, the main body portion includes a first main body portion and a first extension portion connected to a side of the first main body portion facing the first wall, and the first extension portion covers at least part of the surface of the support portion away from the first main body portion.

[0009] In the embodiments of the present application, by setting the main body portion to include a first main body portion and a first extension portion connected to a side of the first main body portion facing the first wall, and the first extension portion covers at least part of the surface of the support portion away from the first main body portion, the connection strength between the main body portion and the support portion is improved, and in the case of thermal runaway of the battery cell, the risk of separation between the main body portion and the support portion of the support plate assembly due to high temperature is reduced, thereby improving the use performance of the battery cell.

[0010] In some embodiments, the first extension portion covers all the surfaces of the support portion away from the first main body portion.

[0011] In the embodiments of the present application, by setting the first extension portion to cover all the surfaces of the support portion away from the first main body portion, the connection strength between the main body portion and the support portion is further improved, and in the case of thermal runaway of the battery cell, the risk of separation between the main body portion and the support portion of the support plate assembly due to high temperature is effectively reduced, thereby improving the use performance of the battery cell.

[0012] In some embodiments, the support portion is provided with a first groove with an opening facing the first main body portion, and / or the support portion is provided with a first through hole penetrating the support portion along the thickness direction of the support portion, wherein the main body portion includes a second extension portion connected to a side of the first main body portion facing the first wall, at least part of the second extension portion is accommodated in the first groove, and / or at least part of the second extension portion is accommodated in the first through hole.

[0013] In the embodiments of the present application, by arranging the first groove with an opening facing the first body part on the support part, and / or the first through hole penetrating through the support part along the thickness direction of the support part, and the second extension part of the body part, at least part of the second extension part is accommodated in the first groove, and / or at least part of the second extension part is accommodated in the first through hole, the connection strength between the body part and the support part can be effectively improved, in the case of thermal runaway of the battery monomer, the risk of falling off between the body part and the support part of the support plate assembly caused by high temperature can be effectively reduced, and the use performance of the battery monomer is improved.

[0014] In some embodiments, along the thickness direction of the body part and towards the first wall, the size of the first groove, and / or the first through hole in the direction perpendicular to the thickness direction of the body part gradually increases.

[0015] In the embodiments of the present application, along the thickness direction of the body part and towards the first wall, the size of the first groove, and / or the first through hole in the direction perpendicular to the thickness direction of the body part gradually increases, and at least part of the second extension part is accommodated in the first groove, and / or at least part of the second extension part is accommodated in the first through hole, which can further improve the connection strength between the body part and the support part, in the case of thermal runaway of the battery monomer, the risk of falling off between the body part and the support part of the support plate assembly caused by high temperature can be effectively reduced, and the use performance of the battery monomer is improved.

[0016] In some embodiments, the body part and the support part are integrally injection molded.

[0017] In the embodiments of the present application, by integrally injection molding the body part and the support part, the structural strength between the body part and the support part of the support plate assembly can be improved, the product consistency can be improved, and the processing and manufacturing costs can be reduced.

[0018] In some embodiments, the minimum thickness of the support plate assembly is greater than or equal to 0.1 mm.

[0019] In the embodiments of the present application, by setting the minimum thickness of the support plate assembly to be greater than or equal to 0.1 mm, the integrally injection molding between the body part and the support part is facilitated, and the yield rate and product consistency of the support plate assembly are improved.

[0020] In some embodiments, the battery monomer further comprises an insulating member, the insulating member and the body part form a second accommodation space, the electrode assembly is accommodated in the second accommodation space, the surface of the support part away from the body part is fixedly connected to the surface of the first wall facing the inside of the battery monomer, and the surface of the body part away from the electrode assembly abuts against the surface of the support part away from the first wall.

[0021] In the embodiment of the present application, the insulating member is arranged in the battery monomer, the insulating member and the main body part enclose to form a second containing space, the electrode assembly is contained in the second containing space, the surface of the support part away from the main body part is fixedly connected with the surface of the first wall facing the inside of the battery monomer, and the surface of the main body part away from the electrode assembly abuts against the surface of the support part away from the first wall, that is, the main body part is connected with the insulating member, and the support part is fixedly connected with the first wall. In the case of thermal runaway of the battery monomer, the risk of falling of the main body part or the support part of the supporting plate assembly caused by high temperature is effectively reduced, the pressure relief performance and manufacturing performance of the battery monomer are taken into account, and the use performance of the battery monomer is improved.

[0022] In some embodiments, the main body part and the insulating member are integrally formed.

[0023] In the embodiment of the present application, the main body part and the insulating member are integrally formed, so as to improve the product consistency of the insulating member and reduce the processing and manufacturing costs.

[0024] In some embodiments, the surface of the support part away from the main body part is weldedly connected with the surface of the first wall facing the inside of the battery monomer.

[0025] In the embodiment of the present application, the surface of the support part away from the main body part is weldedly connected with the surface of the first wall facing the inside of the battery monomer, so as to effectively improve the connection strength between the support part and the first wall. In the case of thermal runaway of the battery monomer, the risk of falling of the support part of the supporting plate assembly caused by high temperature is effectively reduced, and the use performance of the battery monomer is improved.

[0026] In some embodiments, the main body part further comprises an exhaust hole penetrating through the main body part along the thickness direction of the main body part, and the orthogonal projection of the exhaust hole on a plane perpendicular to the thickness direction of the main body part does not overlap with the orthogonal projection of the support part.

[0027] In the embodiment of the present application, the main body part is provided with an exhaust hole penetrating through the main body part along the thickness direction of the main body part, and the orthogonal projection of the exhaust hole on a plane perpendicular to the thickness direction of the main body part does not overlap with the orthogonal projection of the support part. In the case of thermal runaway of the battery monomer, the high-temperature and high-pressure gas generated by the electrode assembly can pass through the exhaust hole and the exhaust passage between the supporting plate assembly and the first wall in sequence, and be smoothly discharged to the outside of the battery monomer through the pressure relief mechanism, so as to improve the pressure relief performance of the battery monomer and improve the use performance of the battery monomer.

[0028] In some embodiments, the material of the support part is one of the following materials: aluminum, copper or stainless steel.

[0029] In the embodiments of the present application, the material of the support part is set to one of the following materials: aluminum, copper or stainless steel, so as to improve the support strength of the support part, so as to form an exhaust passage communicating with the pressure relief mechanism between the support plate assembly and the first wall, and improve the pressure relief performance of the battery monomer.

[0030] In some embodiments, the material of the main body part is polypropylene or polyethylene terephthalate.

[0031] In the embodiments of the present application, the material of the main body part is set to polypropylene or polyethylene terephthalate, so as to insulate the surface of the electrode assembly on the side facing the main body part, reduce the risk of short circuit of the battery monomer, and improve the use performance of the battery monomer.

[0032] In some embodiments, the material of the shell is steel or titanium.

[0033] In the embodiments of the present application, the material of the shell is set to steel or titanium, in the case that the battery monomer is a high-nickel high-silicon system battery monomer, the structural strength and high-temperature performance of the battery monomer can be effectively improved, so as to balance the pressure relief performance and use performance of the battery monomer in the case of thermal runaway of the battery monomer.

[0034] In a second aspect, a battery device is provided, comprising: a plurality of battery monomers, the battery monomers being the battery monomers in the first aspect or each implementation manner thereof.

[0035] In a third aspect, a power utilization device is provided, comprising the battery device in the first aspect, and the battery device is used to provide electric energy for the power utilization device.

[0036] In some implementation manners, the power utilization device can be a vehicle, a ship or a spacecraft, etc.

[0037] In a fourth aspect, an energy storage device is provided, comprising the battery device in the second aspect, and the battery device is used to store electric energy for the energy storage device. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the drawings.

[0039] Figure 1 is a structural schematic diagram of a vehicle provided by an embodiment of the present application.

[0040] Figure 2Figure 1 is a structural schematic diagram of a battery device provided by an embodiment of the present application.

[0041] Figure 3 Figure 2 is a structural schematic diagram of a battery cell provided by an embodiment of the present application.

[0042] Figure 4 Figure 3 is an exploded structural schematic diagram of a battery cell provided by another embodiment of the present application.

[0043] Figure 5 Figure 4 is a partially exploded structural schematic diagram of a battery cell provided by an embodiment of the present application.

[0044] Figure 6 Figure 5 is a cross-sectional schematic diagram of a battery cell provided by an embodiment of the present application.

[0045] Figure 7 Figure 6 is a structural schematic diagram of a pallet assembly provided by an embodiment of the present application.

[0046] Figure 8 Figure 7 is a cross-sectional schematic diagram of a pallet assembly provided by an embodiment of the present application.

[0047] Figure 9 Figure 8 is a cross-sectional schematic diagram of a pallet assembly provided by another embodiment of the present application.

[0048] Figure 10 Figure 9 is a partially cross-sectional schematic diagram of a pallet assembly provided by an embodiment of the present application.

[0049] Figure 11 Figure 10 is a partially cross-sectional schematic diagram of a pallet assembly provided by another embodiment of the present application.

[0050] Figure 12 Figure 11 is a partially cross-sectional schematic diagram of a pallet assembly provided by yet another embodiment of the present application.

[0051] Figure 13 Figure 12 is a partially cross-sectional schematic diagram of a pallet assembly provided by yet another embodiment of the present application.

[0052] Figure 14 Figure 13 is a partially cross-sectional schematic diagram of a pallet assembly provided by yet another embodiment of the present application.

[0053] Figure 15 Figure 14 is a partially cross-sectional schematic diagram of a pallet assembly provided by yet another embodiment of the present application.

[0054] Figure 16 Figure 15 is a partially cross-sectional schematic diagram of a pallet assembly provided by yet another embodiment of the present application.

[0055] Figure 17 Figure 16 is a partially cross-sectional schematic diagram of a pallet assembly provided by yet another embodiment of the present application.

[0056] Figure 18 is a partial cross-sectional view of a pallet assembly according to another embodiment of the present application.

[0057] Figure 19 is a partial cross-sectional view of a pallet assembly according to another embodiment of the present application.

[0058] BRIEF DESCRIPTION OF DRAWINGS 1: vehicle; 10: battery device; 20: battery cell; 30: controller; 40: motor; 11: case; 111: first portion; 112: second portion; 112a: bottom plate; 112b: side plate; 21: outer case; 22: electrode assembly; 211: case; 212: cover plate; 213: pressure relief mechanism; 222a: positive tab; 222b: negative tab; 214: electrode terminal; 214a: positive electrode terminal; 214b: negative electrode terminal; 23: pallet assembly; 24: insulator; 25: liquid injection hole; 231: main body portion; 232: support portion; 2311: first main body portion; 2312: first extension portion; 2313: second extension portion; 233: exhaust hole; 234: first groove; 235: first through hole; 236: positioning hole; 50: first wall; 60: pressure relief hole; 26: first accommodation space; 27: second accommodation space; 70: protection member.

[0059] In the drawings, the drawings are not drawn according to the actual proportion. DETAILED DESCRIPTION

[0060] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0061] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification of the present application is only for the purpose of describing specific embodiments and is not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification of the present application and claims and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, not to describe a particular order or primary and secondary relationship.

[0063] Reference to an "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that that the embodiments described in this application can be combined with each other in their various permutations and combinations.

[0064] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0065] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0066] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0067] "Multiple" appearing in this application means more than two (including two), and similarly, "multiple groups" means more than two groups (including two groups), and "multiple pieces" means more than two pieces (including two pieces).

[0068] If not specifically stated, all embodiments and optional embodiments of the application can be combined with each other to form new technical solutions.

[0069] If not specifically stated, all technical features and optional technical features of the application can be combined with each other to form new technical solutions.

[0070] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0071] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is provided on either one or both of the two surfaces of the positive electrode current collector.

[0072] As an example, the positive electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0073] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or a foam carbon, and the like. When the foam metal is employed as the positive electrode, the foam metal surface can not be provided with the positive electrode active material, and of course, can be provided with the positive electrode active material. As an example, the positive electrode active material is filled or / and deposited within the foam metal.

[0074] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0075] As an example, the negative electrode current collector can employ a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as the metal foil, a pure metal, an alloy, a surface-treated metal, including but not limited to stainless steel, copper, aluminum, nickel, nickel, titanium, or silver, and the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, and the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, and the like).

[0076] As an example, the negative electrode sheet can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0077] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two surfaces of the negative electrode current collector.

[0078] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone or in combination of two or more.

[0079] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as a negative electrode sheet, the foamed metal surface can not be provided with a negative active material, or can be provided with a negative active material.

[0080] As an example, the negative active material can be filled or / and deposited in the negative current collector.

[0081] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0082] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0083] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0084] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes. An inorganic particle coating layer, an organic particle coating layer, or an organic / inorganic composite coating layer can be applied to the surface of the separator film.

[0085] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0086] In some embodiments, the battery cell further comprises an electrolyte, which functions to conduct ions between the positive and negative electrodes. The type of electrolyte is not particularly limited in the present application and can be selected as desired. The electrolyte can be liquid, gel, or solid.

[0087] In some embodiments, the electrolyte is a liquid electrolyte. The liquid electrolyte can comprise an electrolyte salt and a solvent.

[0088] In some embodiments, the electrolyte can optionally further comprise an additive. For example, the additive can comprise a negative electrode film-forming additive, a positive electrode film-forming additive, or an additive capable of improving certain properties of the battery cell, such as an additive capable of improving overcharge / fast charge performance, an additive capable of improving high-temperature performance, an additive capable of improving low-temperature performance, and the like.

[0089] In some embodiments, the electrolyte is a gel electrolyte. The gel electrolyte can comprise a polymer as a backbone network and can be used in combination with an ionic liquid-lithium salt.

[0090] In some embodiments, the electrolyte is a solid electrolyte. The solid electrolyte can comprise a polymer solid electrolyte, an inorganic solid electrolyte, or a composite solid electrolyte.

[0091] As an example, the polymer of the polymer solid electrolyte can comprise a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid, cellulose, or the like.

[0092] As an example, the inorganic solid electrolyte can be one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0093] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0094] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of a wound structure and a stacked structure.

[0095] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0096] In some embodiments, the electrode assembly is a stacked structure.

[0097] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0098] As an example, the positive electrode sheet can be provided in a plurality of pieces, and the negative electrode sheet can be folded to form a plurality of folded sections arranged in layers.

[0099] As an example, the positive electrode sheet and the negative electrode sheet can each be folded to form a plurality of folded sections arranged in layers.

[0100] As an example, the separator can be provided in a plurality of pieces, and each of the plurality of pieces can be disposed between any adjacent positive electrode sheet or negative electrode sheet.

[0101] As an example, the separator can be provided in a continuous piece, and can be disposed between any adjacent positive electrode sheet or negative electrode sheet by being folded or wound.

[0102] In some embodiments, the electrode assembly can have a cylindrical shape, a flat shape, or a polygonal shape.

[0103] In some embodiments, the electrode assembly can be provided with a tab, and the tab can guide current out of the electrode assembly. The tab can include a positive tab and a negative tab.

[0104] In some embodiments, the battery cell can include a case. The case can be a steel case, an aluminum case, a plastic case (e.g., a polypropylene case), a composite metal case (e.g., a copper-aluminum composite case), or an aluminum-plastic film, etc. In some embodiments, the case can be a sealed structure or a non-sealed structure. As an example, when the case is a non-sealed structure, the case can protect the electrode assembly, and a sealing bag can be further included between the case and the electrode assembly. The sealing bag can be used to encapsulate the electrode assembly and an electrolyte. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film. When the case is a sealed structure, the case can be used to encapsulate the electrode assembly and the electrolyte.

[0105] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell having another shape. The prismatic battery cell can include a square battery cell, a blade battery cell, a polygonal battery cell (e.g., a hexagonal battery cell), etc.

[0106] In some embodiments, the case can be provided with at least one electrode terminal, and the electrode terminal can be electrically connected to the tab. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via a current collector. The electrode terminal can be provided on an end cap or on the case.

[0107] In some embodiments, the case can be provided with a pressure relief mechanism. The pressure relief mechanism can be used to discharge internal gas of the battery cell.

[0108] As an example, the internal pressure or temperature of the battery cell reaches a predetermined threshold value, and the pressure relief mechanism is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches the predetermined threshold value, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is broken, thereby forming an opening or a passage for the internal pressure or temperature to be released. The threshold value is designed differently according to design requirements. The threshold value can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell.

[0109] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0110] As an example, the pressure relief mechanism can also be provided separately from the housing and connected.

[0111] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0112] In some embodiments, when the housing is a non-sealed structure, the pressure relief mechanism can be provided as a through hole for discharging the gas inside the battery cell.

[0113] As an example, the pressure relief mechanism can be integrally formed with the housing.

[0114] The battery device according to the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar.

[0115] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0116] As an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells as a single independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0117] In some embodiments, the battery device can be a battery pack including a case and one or more battery cell assemblies accommodated in the case.

[0118] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the case by fixing the battery module in the case.

[0119] As an example, the battery cell assembly can also be accommodated in the case by fixing a plurality of battery cells directly in the case.

[0120] As an example, the case can include a first case and a second case. The first case and the second case are fastened so that an enclosed space is formed inside the case to accommodate the battery cell assembly. Here, enclosed means covered or closed, which can be sealed or unsealed. The first case can be a top cover or a bottom plate.

[0121] As an example, the case can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame, respectively, so that an enclosed space is formed inside the case to accommodate the battery cell assembly.

[0122] In some embodiments, the case can be part of a chassis structure of a vehicle. For example, part of the case can be at least part of a floor of the vehicle, or part of the case can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0123] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0124] The embodiments of the present application provide a power storage device including one or more battery clusters to improve the voltage and capacity of the power storage device. The battery cluster can include a plurality of battery devices connected in series by a busbar component to improve the voltage of the power storage device. When the power storage device includes a plurality of battery clusters, the plurality of battery clusters are connected in parallel to improve the capacity of the power storage device.

[0125] The power storage device can be used in a power storage power station, a wind power generation system, a solar power generation system, a mobile power system, or a temporary power supply system, etc. The power storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the power storage device can store electrical energy during a low electricity usage period and provide electrical energy to related users or electric devices during a high electricity usage period. The power storage system provided by the embodiments of the present application can be any power system that needs to use a power storage device.

[0126] In some embodiments, the power storage device is a power storage container or a power storage cabinet.

[0127] In some embodiments, the power storage device can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body. In some embodiments, the power storage device can include a cabinet body and one or more battery clusters, and the battery clusters are accommodated in the cabinet body.

[0128] In some embodiments, the energy storage device can include a thermal management module, a master control module, a general control module, a power distribution module, a fire control module, and the like.

[0129] As an example, the thermal management module can include a liquid cooling unit that provides a cooling liquid to each battery device through a pipeline for adjusting the temperature of the battery cell.

[0130] As an example, the master control module can serve as a battery management unit of the battery cluster for monitoring and managing the battery cluster. The master control module can monitor information such as current, voltage, power, or temperature of the battery cluster. For example, the charging and discharging current, voltage, and the like of the battery cluster can be controlled. The master control module includes an auxiliary battery management unit, a fusion switch, and the like.

[0131] As an example, the general control module can serve as a battery management unit of the energy storage device for monitoring and managing the energy storage device. The general control module can monitor information such as current, voltage, power, state of charge, or temperature of the energy storage device. For example, the charging and discharging current, voltage, and the like of the energy storage device can be controlled. As an example, the general control module includes an insulation monitoring module, a main battery management unit, an Ethernet and optical fiber conversion module, and the like.

[0132] As an example, the fire control system includes a control panel, a detector, an alarm device, and the like for detecting, alarming, or extinguishing the energy storage system.

[0133] As an example, the power distribution device can be used to distribute power to the energy storage device power module.

[0134] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor in their development. In the development of battery technology, in addition to improving the electrical performance of the battery device, safety is also an issue that cannot be ignored. For example, the structure inside the battery cell can fall off or shake at high temperatures. As an example, for a high-nickel high-silicon battery device, if thermal runaway occurs inside the battery cell, the temperature inside the battery cell can quickly reach 500°C or higher. Since the existing support structure inside the battery cell is usually formed by bonding an insulating plate and a metal block, the insulating plate and the metal block are prone to falling off at high temperatures, affecting the performance of the battery cell and the safety and industrial feasibility of the battery device. If the safety of the battery device cannot be guaranteed, the battery device cannot be used, reducing the performance of the battery device. Therefore, how to improve the performance of the battery cell has become a technical problem to be solved in the field.

[0135] Therefore, the battery monomer, the battery device, the power utilization device and the energy storage device provided by the embodiments of the present application have the advantages that the pressure relief mechanism is arranged to be accommodated in the pressure relief hole of the first wall, and the battery monomer further comprises the supporting plate assembly which is fixed in the space between the electrode assembly and the first wall, the supporting plate assembly comprises the main body part and the supporting part which is located on the side of the main body part away from the electrode assembly, and the exhaust passage which is in communication with the pressure relief mechanism is formed between the main body part and the first wall, and the melting point of the material of the supporting part is greater than the melting point of the material of the main body part, so that in the case of thermal runaway of the battery monomer, the electrode assembly can be supported by the supporting part to reduce the influence on the exhaust function of the battery monomer, and the pressure relief performance of the battery monomer and the structural strength of the supporting plate assembly are taken into account, so that the use performance of the battery monomer is improved.

[0136] The technical solutions described in the embodiments of the present application are suitable for various power utilization devices using battery devices.

[0137] The power utilization device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc. The embodiments of the present application do not specially limit the above power utilization devices.

[0138] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above described power utilization devices, but also can be applied to all devices using batteries. The following embodiments take the vehicle as an example for detailed description.

[0139] For example, asFigure 1 Fig. 1 shows a schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be an electric vehicle, a hybrid vehicle or a range extended vehicle. The vehicle 1 can be provided with a motor 40, a controller 30 and a battery device 10. The controller 30 is configured to control the battery device 10 to supply power to the motor 40. For example, the battery device 10 can be arranged at the bottom, the front or the rear of the vehicle 1. The battery device 10 can be configured to supply power to the vehicle 1. For example, the battery device 10 can be configured as a power supply of the vehicle 1, and can be configured to supply power to the circuit system of the vehicle 1, such as the power required for starting, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery device 10 can be configured as a power supply of the vehicle 1, and can be configured to replace or partially replace the fuel or natural gas to provide driving power for the vehicle 1.

[0140] In order to meet different power requirements, the battery device 10 according to an embodiment of the present application can include at least one battery cell assembly. The battery cell assembly includes a plurality of battery cells. The plurality of battery cells can be electrically connected in series, in parallel or in a hybrid manner to form the battery device 10. The hybrid manner refers to a combination of series connection and parallel connection. The battery device 10 can also be referred to as a battery pack. For example, the plurality of battery cells can be connected in series, in parallel or in a hybrid manner to form a battery module, and the plurality of battery modules can be connected in series, in parallel or in a hybrid manner to form the battery device 10. That is, the plurality of battery cells can be directly connected to form the battery device 10, or the plurality of battery cells can be connected to form a battery module, and the battery module can be connected to form the battery device 10.

[0141] For example, as shown in Fig. 2, the plurality of battery cells 20 can be connected in parallel to form a battery module 21. The plurality of battery modules 21 can be connected in series to form the battery device 10. Figure 2 Fig. 3 shows a schematic diagram of a battery device 10 according to an embodiment of the present application. The battery device 10 can include a plurality of battery cells 20. The battery device 10 can also include a box 11 (or a cover). The box 11 has a hollow structure, and the plurality of battery cells 20 can be arranged in the box 11. For example, the plurality of battery cells 20 can be connected in parallel, in series or in a hybrid manner to form a battery module 21, and the battery module 21 can be arranged in the box 11.

[0142] For example, as shown in Fig. 4, the plurality of battery cells 20 can be connected in parallel to form a battery module 21. The plurality of battery modules 21 can be connected in series to form the battery device 10. Figure 2As shown, the box 11 can include two parts, here referred to as a first structure 111 and a second structure 112, which are buckled together. The shapes of the first structure 111 and the second structure 112 can be determined according to the shape of the combination of the plurality of battery monomers 20, and the first structure 111 and the second structure 112 can each have an opening. For example, the first structure 111 and the second structure 112 can each be a hollow cuboid and each have only one face as an opening face, the opening of the first structure 111 and the opening of the second structure 112 are oppositely arranged, and the first structure 111 and the second structure 112 are buckled to each other to form a box 11 with a closed cavity. Among them, the second structure 112 can include a bottom plate 112a, a side plate 112b and a beam. The plurality of battery monomers 20 are combined in parallel or in series or in a hybrid manner and placed in the box 11 formed after the buckling of the first structure 111 and the second structure 112.

[0143] Optionally, the battery device 10 can also include other structures, which will not be described one by one here. For example, the battery device 10 can also include a current collecting component for realizing the electrical connection between the plurality of battery monomers 20, such as parallel connection, series connection or hybrid connection. Specifically, the current collecting component can realize the electrical connection between the battery monomers 20 by connecting the electrode terminals of the battery monomers 20. Further, the current collecting component can be fixed to the electrode terminals of the battery monomers 20 by welding. The electrical energy of the plurality of battery monomers 20 can be further led out through the box by a conductive mechanism. Optionally, the conductive mechanism can also belong to the current collecting component.

[0144] According to different power requirements, the number of battery monomers 20 can be set to any value. The plurality of battery monomers 20 can be connected in series, parallel or hybrid manner to achieve larger capacity or power. Since the number of battery monomers 20 included in each battery device 10 can be large, in order to facilitate installation, the battery monomers 20 can be arranged in groups, and each group of battery monomers 20 forms a battery module. The number of battery monomers 20 included in the battery module is not limited and can be set according to requirements.

[0145] In the embodiments of the present application, according to different power requirements, the number of battery monomers 20 can be set to any value. The plurality of battery monomers 20 can be connected in series, parallel or hybrid manner to achieve larger capacity or power. Since the number of battery monomers 20 included in each battery device 10 can be large, in order to facilitate installation, the battery monomers 20 can be arranged in groups, and each group of battery monomers 20 forms a battery module. The number of battery monomers 20 included in the battery module is not limited and can be set according to requirements. The battery device 10 can include a plurality of battery modules, and these battery modules can be connected in series, parallel or hybrid manner.

[0146] Figure 3This paper shows a schematic diagram of the structure of a battery cell 20 provided in an embodiment of this application. Figure 4 An exploded structural diagram of a battery cell 20 according to another embodiment of this application is shown. Figure 3 and Figure 4 As shown, the battery cell 20 in this embodiment may include: a housing 21 and an electrode assembly 22. The housing 21 has a closed receiving space, and the electrode assembly 22 is placed in the receiving space within the housing 21. The housing 21 may include a shell 211 and a cover plate 212. The shell 211 is a hollow structure with at least one opening; the cover plate 212 is used to fasten with the shell 211 to form the housing 21 with a closed receiving space.

[0147] In some embodiments, the cover plate 212 may be a plate-like structure used to cover the opening of the housing 211. In other embodiments, the cover plate 212 has a similar structure to the housing 211, that is, both the housing 211 and the cover plate 212 are hollow structures with one opening, and the two openings are joined together to form an outer shell 21 with a closed accommodating space.

[0148] It should be understood that if the cover plate 212 is a plate-shaped structure, the shell 211 can be a hollow structure with an opening at one or more ends. For example, if the shell 211 is a hollow structure with an opening at one end, the cover plate 212 can be set as one; if the shell 211 is a hollow structure with openings at opposite ends, the cover plate 212 can be set as two, and the two cover plates 212 respectively cover the openings at both ends of the shell 211.

[0149] The outer shell 21 can be of various shapes, such as a cylinder, a cuboid, or other polyhedrons. For example, ... Figure 3 and Figure 4 As shown in the embodiments of this application, the description mainly takes the outer shell 21 as a cuboid structure.

[0150] It should be understood that the cover plate 212 in this embodiment of the application is used to cooperate with the housing 211 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the cover plate 212 can be adapted to the shape of the housing 211, such as... Figure 3 and Figure 4 As shown, the shell 211 has a cuboid structure, and the cover plate 212 has a rectangular plate structure that is adapted to the shell 211.

[0151] In some embodiments, the housing 211 may be a hollow structure with an opening at at least one end, and the shape of the cover plate 212 may be adapted to the shape of the housing 211. The cover plate 212 is used to cover the opening of the housing 211 so that the housing 21 isolates the internal environment of the battery cell 20 from the external environment. If the housing 211 is a hollow structure with an opening at one end, the cover plate 212 may be provided as one.

[0152] The shell 211 in this embodiment may be made of one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The cover plate 212 may also be made of one or more materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 212 may be the same as or different from that of the shell 211; the materials of the different walls of the shell 211 may also be the same or different.

[0153] The cover plate 212 in this embodiment can be any wall of the outer shell 21. For example, the cover plate 212 can be the wall with the largest area among the multiple walls included in the outer shell 21, or the wall with the smallest area, or it can be other walls. This embodiment is not limited to this. Alternatively, the cover plate 212 can also be other structures. For example, the cover plate 212 can also be a groove structure with an opening to cover the opening of the housing 211. This embodiment is not limited to this.

[0154] It should be understood that the battery cell 20 also includes electrode terminals 214. In this embodiment, the electrode terminals 214 are used for electrical connection with the electrode assembly 22 inside the battery cell 20 to output the electrical energy of the battery cell 20. Figure 3 to Figure 4 As shown, the battery cell 20 may include at least two electrode terminals 214, which may include at least one positive electrode terminal 214a and at least one negative electrode terminal 214b. The positive electrode terminal 214a is used for electrical connection to the positive electrode tab 222a of the electrode assembly 22, and the negative electrode terminal 214b is used for electrical connection to the negative electrode tab 222b of the electrode assembly 22. The positive electrode terminal 214a and the positive electrode tab 222a may be directly connected or indirectly connected, and the negative electrode terminal 214b and the negative electrode tab 222b may be directly connected or indirectly connected. For example, the positive electrode terminal 214a may be electrically connected to the positive electrode tab 222a through a connecting member (not shown in the figure), and the negative electrode terminal 214b may be electrically connected to the negative electrode tab 222b through a connecting member.

[0155] In this embodiment, the wall of the housing 211 and the wall of the cover plate 212 are both referred to as the wall of the battery cell 20, wherein for Figure 3 and Figure 4The rectangular battery cell 20 shown in FIG. 1 includes a housing 211 and a cover plate 212. The walls of the housing 211 include a bottom wall and four side walls. The housing 211 is shaped according to the shape of the one or more electrode assemblies 22 combined together. For example, the housing 211 can be a hollow rectangular or square or cylindrical body, and one of the faces of the housing 211 has an opening so that the one or more electrode assemblies 22 can be placed inside the housing 211. For example, when the housing 211 is a hollow rectangular or square body, one of the flat faces of the housing 211 is an open face, i.e., the flat face does not have a wall so that the inside of the housing 211 is in communication with the outside. When the housing 211 is a hollow cylindrical body, one of the end faces of the housing 211 is an open face, i.e., the end face does not have a wall so that the inside of the housing 211 is in communication with the outside. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity in which the electrode assembly 22 is placed. The housing 211 is filled with an electrolyte, such as an electrolytic solution.

[0156] In some implementations, the battery cell 20 further includes a tray assembly 23 disposed inside the housing 211, and the side of the tray assembly 23 away from the electrode assembly 22 is attached to the side of the bottom wall of the housing 211 facing the electrode assembly 22. For example, the side of the tray assembly 23 away from the electrode assembly 22 can be fixedly connected or non-fixedly connected to the side of the bottom wall of the housing 211 facing the electrode assembly 22, such as being adhesively connected to the side of the bottom wall of the housing 211 facing the electrode assembly 22.

[0157] In some implementations, the cover plate 212 of the battery cell 20 is provided with a liquid injection hole 25 through which electrolytic solution can be injected into the inside of the battery cell 20 to replenish the electrolytic solution of the battery cell 20.

[0158] In the battery cell 20, the electrode assembly 22 is the component in which electrochemical reactions occur in the battery cell 20. Depending on the actual use requirements, the electrode assembly 22 in the housing 211 can be one or multiple. For example, as shown in FIG. 1, the battery cell 20 is provided with two electrode assemblies 22. The electrode assembly 22 can be a cylindrical body, a rectangular body, etc. If the electrode assembly 22 is a cylindrical structure, the housing 211 can also be a cylindrical structure. If the electrode assembly 22 is a rectangular structure, the housing 211 can also be a rectangular structure. Figure 4

[0159] ​In some embodiments, the battery cell 20 can further comprise an insulation member 24 disposed in the receiving space of the housing 211, and the insulation member 24 can be a hollow structure with one or more ends open, and the receiving space in the hollow structure is used to accommodate the electrode assembly 22 to improve the insulation performance of the battery cell 20. It should also be understood that in some embodiments, the battery cell 20 further comprises a bonding member which can be disposed between the insulation member 24 and the backing plate assembly 23 for fixedly connecting the insulation member 24 and the backing plate assembly 23. Exemplarily, the bonding member can be an L-shaped structure.

[0160] In some embodiments, the battery cell 20 can further comprise other structures, which will not be described one by one here. For example, the battery cell 20 can further comprise a busbar member (not shown in the figure) for realizing the electrical connection between a plurality of battery cells 20, such as parallel connection or series connection or mixed connection. Specifically, the busbar member can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Further, the busbar member can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the plurality of battery cells 20 can be further led out through the box body 11 by a conductive mechanism. Alternatively, the conductive mechanism can also belong to the busbar member.

[0161] Figure 5 An exploded structural schematic diagram of the battery cell 20 provided by another embodiment of the present application is shown. Figure 6 A cross-sectional schematic diagram of the battery cell 20 provided by an embodiment of the present application is shown. Figure 7 A structural schematic diagram of the backing plate assembly 23 provided by an embodiment of the present application is shown. Figure 8 A cross-sectional schematic diagram of the backing plate assembly 23 provided by an embodiment of the present application is shown. Figure 9 A cross-sectional schematic diagram of the backing plate assembly 23 provided by another embodiment of the present application is shown. Exemplarily, Figure 8 The cross-sectional schematic diagram of the backing plate assembly 23 shown in FIG. 6 can be a cross-sectional schematic diagram of the side of the backing plate assembly 23 away from the first wall 50 in a plane perpendicular to the thickness direction of the backing plate assembly 23. Figure 9 The cross-sectional schematic diagram of the backing plate assembly 23 shown in FIG. 7 can be a cross-sectional schematic diagram of the side of the backing plate assembly 23 toward the first wall 50 in a plane perpendicular to the thickness direction of the backing plate assembly 23.

[0162] In some embodiments, as Figure 5 to Figure 9As shown, the battery cell 20 comprises an electrode assembly 22, a shell 211, a pressure relief mechanism 213, and a backplate assembly 23; the shell 211 comprises a first accommodating space 26, the electrode assembly 22 is accommodated in the first accommodating space 26, the shell 211 has a first wall 50 provided with a pressure relief hole 60 penetrating the first wall 50, the pressure relief hole 60 is communicated with the first accommodating space 26; the pressure relief mechanism 213 is accommodated in the pressure relief hole 60 and connected to the shell 211; the backplate assembly 23 is fixed in a space between the electrode assembly 22 and the first wall 50, the backplate assembly 23 comprises a main body part 231 and a support part 232, the support part 232 is located on a side of the main body part 231 away from the electrode assembly 22, a gas discharge passage communicated with the pressure relief mechanism 213 is formed between the main body part 231 and the first wall 50; wherein the melting point of the material of the support part 232 is greater than the melting point of the material of the main body part 231.

[0163] It should be understood that the battery cell 20 of the embodiments of the present application can be a polyhedral structure of any shape, that is, the shell 211 in the battery cell 20 can comprise a plurality of walls, and the first wall 50 is any one wall of the shell 211 of the battery cell 20, that is, the pressure relief mechanism 213 can be located in any one wall of the shell 211 of the battery cell 20.

[0164] Exemplarily, the first wall 50 comprises but is not limited to the following examples: the first wall 50 can be the wall with the smallest area of the shell 211 of the battery cell 20; the first wall 50 can also be the wall with the largest area of the shell 211 of the battery cell 20; the first wall 50 can be the wall of the shell 211 of the battery cell 20 provided with the electrode terminal 214; the first wall 50 can be the wall adjacent to the wall of the battery cell 20 provided with the electrode terminal 214; the first wall can be the wall opposite to the wall of the battery cell 20 provided with the electrode terminal 214.

[0165] It should also be understood that the first wall 50 is provided with the pressure relief hole 60 communicated with the accommodating cavity of the shell 211, that is, a through hole structure can be provided on the first wall 50 as the pressure relief hole 60. The shape of the pressure relief hole 60 in the plane perpendicular to the thickness direction of the first wall 50 can be set according to actual needs, for example, in the plane perpendicular to the thickness direction of the first wall 50, the shape of the pressure relief hole 60 can be circular, oval, polygonal, rectangular, etc., as an example, the embodiments of the present application do not limit this.

[0166] It should also be understood that the pressure relief mechanism 213 of the embodiments of the present application refers to an element or component that is actuated when the internal pressure or temperature of the battery cell 20 reaches a predetermined threshold value to release the internal pressure or temperature. The threshold value is designed differently according to different design requirements. The threshold value can depend on the material of one or more of the positive electrode tab, the negative electrode tab, the electrolyte, and the separator in the battery cell 20.

[0167] The "actuation" mentioned in the present application refers to the action generated by the pressure relief mechanism 213 or the activation of the pressure relief mechanism 213 to a certain state, so that the internal pressure and temperature of the battery cell 20 can be released. The action generated by the pressure relief mechanism 213 can include but is not limited to at least one of the following: rupture, fragmentation, tearing, or opening of the pressure relief mechanism 213, etc. During the actuation of the pressure relief mechanism 213, the high-temperature and high-pressure substances inside the battery cell 20 are discharged as exhaust from the actuated part. In this way, the battery cell 20 can be relieved of pressure and temperature in a controllable manner, thereby avoiding potential more serious accidents.

[0168] The exhaust from the battery cell 20 mentioned in the embodiments of the present application includes but is not limited to electrolyte, dissolved or split positive and negative electrode tabs, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0169] Exemplarily, the pressure relief mechanism 213 can be arranged on the bottom wall of the battery cell 20, for example, the pressure relief mechanism 213 can be arranged on the bottom wall of the housing 211. The pressure relief mechanism 213 can be various possible pressure relief mechanisms 213. For example, the pressure relief mechanism 213 can be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value; and / or the pressure relief mechanism 213 can be a pressure-sensitive pressure relief mechanism configured to rupture when the internal gas pressure of the battery cell 20 provided with the pressure relief mechanism 213 reaches a threshold value.

[0170] It should also be understood that the battery cell 20 in the embodiments of the present application further comprises a protection piece 70, which can be accommodated in the pressure relief hole 60 and connected to the housing 211. The orthographic projection of the protection piece 70 can cover the orthographic projection of the pressure relief mechanism 213 in the plane perpendicular to the thickness direction of the first wall 50. The protection piece 70 is used to protect the pressure relief mechanism 213 to reduce the risk of wear or damage of the pressure relief mechanism 213 during use and improve the use stability of the pressure relief mechanism 213. The material of the protection piece 70 includes but is not limited to plastic, rubber, or silicone, etc. The shape of the protection piece 70 can be set according to actual requirements, and exemplarily, the shape of the protection piece 70 can be set according to the shape of the pressure relief mechanism 213.

[0171] It should also be understood that the first accommodating space 26 included in the shell 211 in the embodiments of the present application can be used to accommodate the electrode assembly 22, and the first accommodating space 26 can be an open accommodating space having an opening at one end or two ends, and in particular, the first accommodating space 26 can be sealed by the cover plate 212.

[0172] It should also be understood that the space in which the support plate assembly 23 is fixed between the electrode assembly 22 and the first wall 50 can mean that the main body part 231 and the support part 232 in the support plate assembly 23 can be fixed in the interior of the battery monomer 20 and do not fall off or shake under different working conditions or in the case of thermal runaway of the battery monomer 20. In addition, the main body part 231 and the support part 232 can be fixedly connected or directly contact but not fixedly connected. It should also be understood that the surface of the support plate assembly 23 is provided with at least one positioning hole 236 to facilitate assembly of the support plate assembly 23.

[0173] It should also be understood that the exhaust passage formed between the main body part 231 and the first wall 50 and communicating with the pressure relief mechanism 213 can mean that high-temperature and high-pressure gas generated in the interior of the battery monomer 20 can pass through the exhaust passage between the main body part 231 and the first wall 50 and be discharged to the outside of the battery monomer 20 through the pressure relief mechanism 213 in the case of thermal runaway of the battery monomer 20.

[0174] It should also be understood that the melting point of the material of the support part 232 is greater than the melting point of the material of the main body part 231 can mean that the electrode assembly 22 can be supported by the support part 232 to reduce the influence on the exhaust function of the battery monomer 20 in the case of thermal runaway of the battery monomer 20, that is, as the temperature in the interior of the battery monomer 20 increases and the main body part 231 melts, so that the pressure relief mechanism 213 can normally operate.

[0175] In the embodiments of the present application, the pressure relief mechanism 213 is arranged to be accommodated in the pressure relief hole 60 of the first wall 50, and the battery monomer 20 further includes the support plate assembly 23 fixed in the space between the electrode assembly 22 and the first wall 50. The support plate assembly 23 includes the main body part 231 and the support part 232 located on the side of the main body part 231 away from the electrode assembly 22. The melting point of the material of the support part 232 is greater than the melting point of the material of the main body part 231. An exhaust passage is formed between the main body part 231 and the first wall 50 and communicates with the pressure relief mechanism 213. In the case of thermal runaway of the battery monomer 20, the electrode assembly 22 can be supported by the support part 232 to reduce the influence on the exhaust function of the battery monomer 20. The pressure relief performance of the battery monomer 20 and the structural strength of the support plate assembly 23 are taken into account, so that the use performance of the battery monomer 20 is improved.

[0176] In some implementations, the material of the support portion 232 has a melting point greater than or equal to 200°C. For example, the material of the support portion 232 can have a melting point of 200°C, 250°C, 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, 600°C, 650°C, 700°C, or the like, or a value within a range between any two of the aforementioned values.

[0177] In the embodiments of the present application, by setting the melting point of the material of the support portion 232 to be greater than or equal to 200°C, in the case of thermal runaway of the battery cell 20, the electrode assembly 22 can be effectively supported by the support portion 232 to reduce the impact on the exhaust function of the battery cell 20, improve the pressure relief performance of the battery cell 20 and the structural strength of the support plate assembly 23, and thus improve the use performance of the battery cell 20.

[0178] Figure 10 A cross-sectional view of the support plate assembly 23 according to an embodiment of the present application is shown. Figure 11 A cross-sectional view of the support plate assembly 23 according to another embodiment of the present application is shown.

[0179] In some implementations, as shown in FIGS. 1 and 2, the support plate assembly 23 can include a support portion 232 and a main body portion 231. Figure 10 and Figure 11 The main body portion 231 includes a first main body portion 2311 and a first extension portion 2312 connected to a side of the first main body portion 2311 facing the first wall 50, and the first extension portion 2312 covers at least part of the surface of the support portion 232 away from the first main body portion 2311.

[0180] It should be understood that the first main body portion 2311 and the first extension portion 2312 in the embodiments of the present application can be integrally formed or separately formed. In the case of integrally formed, the main body portion 231 can be integrally injection molded, and the materials of the first main body portion 2311 and the first extension portion 2312 can be the same. Alternatively, in some implementations, the first main body portion 2311, the first extension portion 2312, and the support portion 232 can be integrally injection molded.

[0181] In the embodiment of the present application, by setting the main body part 231 to include the first main body part 2311 and the first extension part 2312 connected to the side of the first main body part 2311 facing the first wall 50, the first extension part 2312 covers at least part of the surface of the support part 232 away from the first main body part 2311, so as to improve the connection strength between the main body part 231 and the support part 232, reduce the risk of falling between the main body part 231 and the support part 232 of the tray assembly 23 caused by high temperature in the case of thermal runaway of the battery monomer 20, and thus improve the use performance of the battery monomer 20.

[0182] In some implementations, as shown in Figure 11 the first extension part 2312 covers all the surfaces of the support part 232 away from the first main body part 2311. In this way, in the embodiment of the present application, by setting the first extension part 2312 to cover all the surfaces of the support part 232 away from the first main body part 2311, the connection strength between the main body part 231 and the support part 232 is further improved, and the risk of falling between the main body part 231 and the support part 232 of the tray assembly 23 caused by high temperature in the case of thermal runaway of the battery monomer 20 is effectively reduced, thereby improving the use performance of the battery monomer 20.

[0183] Figure 12 A cross-sectional view of the tray assembly 23 provided by an embodiment of the present application is shown. Figure 13 A cross-sectional view of the tray assembly 23 provided by another embodiment of the present application is shown.

[0184] In some implementations, as shown in Figure 12 and Figure 13 the support part 232 is provided with a first groove 234 with an opening facing the first main body part 2311, and / or the support part 232 is provided with a first through hole 235 penetrating the support part 232 along the thickness direction of the support part 232, wherein the main body part 231 includes a second extension part 2313 connected to the side of the first main body part 2311 facing the first wall 50, at least part of the second extension part 2313 is accommodated in the first groove 234, and / or at least part of the second extension part 2313 is accommodated in the first through hole 235.

[0185] It should be understood that the shape of the first groove 234 provided on the support portion 232 and having an opening facing the first body portion 2311 can be set according to actual needs, and in a plane perpendicular to the thickness direction of the support portion 232, the shape of the first groove 234 can be circular, oval, polygonal, rectangular, etc. It should also be understood that the number of first grooves 234 provided on the support portion 232 can be set according to actual needs, for example, the support portion 232 can be provided with one or more first grooves 234.

[0186] It should also be understood that the shape of the first through hole 235 provided on the support portion 232 and penetrating the support portion 232 in the thickness direction of the support portion 232 can be set according to actual needs, and in a plane perpendicular to the thickness direction of the support portion 232, the shape of the first through hole 235 can be circular, oval, polygonal, rectangular, etc. It should also be understood that the number of first through holes 235 provided on the support portion 232 can be set according to actual needs, for example, the support portion 232 can be provided with one or more first through holes 235.

[0187] It should also be understood that the first body portion 2311 and the second extension portion 2313 in the embodiments of the present application can be integrally formed or separately formed, and in the case of integrally formed, the body portion 231 can be integrally injection molded, and the materials of the first body portion 2311 and the second extension portion 2313 can be set as the same material.

[0188] It should also be understood that at least part of the second extension portion 2313 is accommodated in the first groove 234, and / or at least part of the second extension portion 2313 is accommodated in the first through hole 235 can mean that the second extension portion 2313 is connected with the first groove 234 and / or the first through hole 235 by clamping, bonding or interference. Alternatively, in some implementations, the first body portion 2311, the second extension portion 2313 and the support portion 232 can be integrally injection molded.

[0189] In this embodiment, by providing a first groove 234 with an opening facing the first main body 2311 on the support portion 232, and / or providing a first through hole 235 penetrating the support portion 232 along the thickness direction of the support portion 232, and providing a second extension portion 2313 on the main body 231, at least a portion of the second extension portion 2313 being accommodated in the first groove 234, and / or at least a portion of the second extension portion 2313 being accommodated in the first through hole 235, the connection strength between the main body 231 and the support portion 232 can be effectively improved. In the event of thermal runaway of the battery cell 20, the risk of the main body 231 and the support portion 232 falling off due to high temperature can be effectively reduced, thereby improving the performance of the battery cell 20.

[0190] Figure 14 A cross-sectional schematic diagram of a tray assembly 23 provided in one embodiment of this application is shown. Figure 15 A cross-sectional schematic diagram of a tray assembly 23 provided in another embodiment of this application is shown. Figure 16 A cross-sectional schematic diagram of a tray assembly 23 provided in one embodiment of this application is shown. Figure 17 A cross-sectional schematic diagram of a tray assembly 23 provided in another embodiment of this application is shown.

[0191] In some implementations, such as Figure 14 to Figure 17 As shown, along the thickness of the main body 231 and toward the first wall 50, the dimensions of the first groove 234 and / or the first through hole 235 gradually increase in the direction perpendicular to the thickness of the main body 231.

[0192] It should be understood that the aforementioned first groove 234, and / or the first through hole 235, gradually increasing in size in the direction perpendicular to the thickness of the main body 231 can refer to, for example... Figure 14 and Figure 15 As shown, the first groove 234 and / or the first through hole 235 increase in dimensional continuity in the direction perpendicular to the thickness of the main body 231; or, it can also refer to, as... Figure 16 and Figure 17 As shown, the dimensions of the first groove 234 and / or the first through hole 235 increase in a stepped manner in the thickness direction perpendicular to the main body 231.

[0193] In the embodiment of the present application, the first groove 234 and / or the first through hole 235 gradually increase in size in a direction perpendicular to the thickness of the main body portion 231, and at least part of the second extension portion 2313 is accommodated in the first groove 234 and / or the first through hole 235, which can further improve the connection strength between the main body portion 231 and the support portion 232, effectively reduce the risk of the main body portion 231 and the support portion 232 of the support plate assembly 23 falling off due to high temperature in the case of thermal runaway of the battery monomer 20, and improve the use performance of the battery monomer 20.

[0194] Figure 18 A cross-sectional view of the support plate assembly 23 provided by an embodiment of the present application is shown. Figure 19 A cross-sectional view of the support plate assembly 23 provided by another embodiment of the present application is shown.

[0195] In some implementations, as shown in Figure 18 the support portion 232 of the support plate assembly 23 shown in Figure 18 includes a first groove 234 with an opening facing the first main body portion 2311, and the main body portion 231 includes a first main body portion 2311 and a second extension portion 2313 connected to a side of the first main body portion 2311 facing the first wall 50, at least part of the second extension portion 2313 is accommodated in the first groove 234, and the main body portion 231 further includes a first extension portion 2312 connected to a side of the first main body portion 2311 facing the first wall 50, and the first extension portion 2312 covers all surfaces of the support portion 232 away from the first main body portion 2311.

[0196] In some implementations, as shown in Figure 19 the support portion 232 of the support plate assembly 23 shown in Figure 19 includes a first through hole 235 extending through the support portion 232 in a thickness direction of the support portion 232, and the main body portion 231 includes a first main body portion 2311 and a second extension portion 2313 connected to a side of the first main body portion 2311 facing the first wall 50, at least part of the second extension portion 2313 is accommodated in the first through hole 235, and the main body portion 231 further includes a first extension portion 2312 connected to a side of the first main body portion 2311 facing the first wall 50, and the first extension portion 2312 covers all surfaces of the support portion 232 away from the first main body portion 2311.

[0197] In some implementations, the main body part 231 and the support part 232 are integrally injection molded. As shown in Figure 10 and Figure 11 , the first main body part 2311, the first extension part 2312, and the support part 232 can be integrally injection molded. As shown in Figure 12 to Figure 17 , the first main body part 2311, the second extension part 2313, and the support part 232 can be integrally injection molded. As shown in Figure 18 and Figure 19 , the first main body part 2311, the first extension part 2312, the second extension part 2313, and the support part 232 can be integrally injection molded.

[0198] In the embodiments of the present application, by integrally injection molding the main body part 231 and the support part 232, the structural strength between the main body part 231 and the support part 232 of the tray assembly 23 can be improved, the product consistency can be improved, and the processing and manufacturing costs can be reduced.

[0199] In some implementations, the minimum thickness of the tray assembly 23 is greater than or equal to 0.1 mm.

[0200] For example, the minimum thickness of the tray assembly 23 can be set to 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc., or a value within a range obtained by combining any two of the above values.

[0201] In the embodiments of the present application, by setting the minimum thickness of the tray assembly 23 to be greater than or equal to 0.1 mm, integrally injection molding between the main body part 231 and the support part 232 is facilitated, and the yield rate and product consistency of the tray assembly 23 are improved.

[0202] In some implementations, as shown in Figure 4 , the battery cell 20 further includes an insulating member 24, the insulating member 24 and the main body part 231 form a second containing space 27, the electrode assembly 22 is contained in the second containing space 27, the surface of the support part 232 away from the main body part 231 is fixedly connected to the surface of the first wall 50 facing the inside of the battery cell 20, and the surface of the main body part 231 away from the electrode assembly 22 abuts against the surface of the support part 232 away from the first wall 50.

[0203] It should be understood that the insulating member 24 in the embodiments of the present application can be a hollow insulating structure having openings at both ends, which is used to wrap the electrode assembly 22 to improve the insulation performance of the battery monomer 20. The main body part 231 can be located on the side of the electrode assembly 22 facing the first wall 50 and connected with the insulating member 24 to form a second containing space 27 containing the electrode assembly 22. It should also be understood that the insulating member 24 and the main body part 231 can be integrally formed or separately formed, and in the case of integrally forming the insulating member 24 and the main body part 231, the insulating member 24 and the main body part 231 can be integrally injection molded.

[0204] In the embodiments of the present application, by providing the insulating member 24 in the battery monomer 20, the insulating member 24 and the main body part 231 form the second containing space 27, the electrode assembly 22 is contained in the second containing space 27, the surface of the side of the support part 232 away from the main body part 231 is fixedly connected with the surface of the side of the first wall 50 facing the inside of the battery monomer 20, and the surface of the side of the main body part 231 away from the electrode assembly 22 abuts against the surface of the side of the support part 232 away from the first wall 50, that is, the main body part 231 is connected with the insulating member 24, and the support part 232 is fixedly connected with the first wall 50, in the case of thermal runaway of the battery monomer 20, effectively reducing the risk of the main body part 231 or the support part 232 of the support plate assembly 23 falling off due to high temperature, so as to balance the pressure relief performance and manufacturing performance of the battery monomer 20, thereby improving the use performance of the battery monomer 20.

[0205] In some implementations, the main body part 231 and the insulating member 24 are integrally formed. For example, the main body part 231 and the insulating member 24 can be prepared by integrally injection molding or hot forming.

[0206] In the embodiments of the present application, the main body part 231 and the insulating member 24 are integrally formed to improve the product consistency of the insulating member 24 and reduce the processing and manufacturing costs.

[0207] In some implementations, the surface of the side of the support part 232 away from the main body part 231 is welded to the surface of the side of the first wall 50 facing the inside of the battery monomer 20. In this way, in the embodiments of the present application, by providing the surface of the side of the support part 232 away from the main body part 231 to be welded to the surface of the side of the first wall 50 facing the inside of the battery monomer 20, the connection strength between the support part 232 and the first wall 50 is effectively improved, in the case of thermal runaway of the battery monomer 20, effectively reducing the risk of the support part 232 of the support plate assembly 23 falling off due to high temperature, thereby improving the use performance of the battery monomer 20.

[0208] In some implementations, asFigure 7 to Figure 9 As shown, the main body portion 231 further includes an exhaust hole 233 penetrating the main body portion 231 along the thickness direction of the main body portion 231, and in a plane perpendicular to the thickness direction of the main body portion 231, the orthogonal projection of the exhaust hole 233 does not overlap the orthogonal projection of the support portion 232.

[0209] It should be understood that in the case of thermal runaway of the battery monomer 20, the high-temperature and high-pressure gas generated inside the battery monomer 20 can pass through the exhaust hole 233 in turn into the exhaust passage, and be discharged to the outside of the battery monomer 20 through the pressure relief mechanism 213. It should also be understood that in a plane perpendicular to the thickness direction of the main body portion 231, the shape of the exhaust hole 233 can be circular, oval, polygonal, rectangular, etc. Secondly, the number of exhaust holes 233 on the main body portion 231 can be set according to the actual heat dissipation or pressure relief requirements.

[0210] In the embodiments of the present application, by providing the main body portion 231 with an exhaust hole 233 penetrating the main body portion 231 along the thickness direction of the main body portion 231, and in a plane perpendicular to the thickness direction of the main body portion 231, the orthogonal projection of the exhaust hole 233 does not overlap the orthogonal projection of the support portion 232, in the case of thermal runaway of the battery monomer 20, the high-temperature and high-pressure gas generated by the electrode assembly 22 can pass through the exhaust hole 233 and the exhaust passage between the support plate assembly 23 and the first wall 50 in turn, and be smoothly discharged to the outside of the battery monomer 20 through the pressure relief mechanism 213, to improve the pressure relief performance of the battery monomer 20, thereby improving the use performance of the battery monomer 20.

[0211] In some implementations, the material of the support portion 232 includes at least one of the following materials: aluminum, copper, stainless steel.

[0212] In the embodiments of the present application, by setting the material of the support portion 232 to at least one of the following materials: aluminum, copper, stainless steel, the support strength of the support portion 232 is improved, so as to form an exhaust passage between the support plate assembly 23 and the first wall 50 that communicates with the pressure relief mechanism 213, and improve the pressure relief performance of the battery monomer 20.

[0213] In some implementations, the material of the main body portion 231 includes polypropylene or polyethylene terephthalate. In this way, in the embodiments of the present application, by setting the material of the main body portion 231 to include polypropylene or polyethylene terephthalate, the surface of the electrode assembly 22 on the side facing the main body portion 231 is insulated, the risk of short circuit of the battery monomer 20 is reduced, and the use performance of the battery monomer 20 is improved.

[0214] In some implementations, the material of the shell 211 includes steel or titanium. In this way, in the embodiments of the present application, by setting the material of the shell 211 to include steel or titanium, in the case that the battery cell 20 is a battery cell 20 of a high-nickel high-silicon system, the structural strength and high-temperature performance of the battery cell 20 can be effectively improved, so as to balance the pressure relief performance and use performance of the battery cell 20 in the case that the battery cell 20 is in thermal runaway.

[0215] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10, comprising a plurality of battery cells 20, the battery cell 20 being the battery cell 20 in any of the above embodiments.

[0216] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10, comprising a plurality of battery cells 20, the battery cell 20 being the battery cell 20 in any of the above embodiments. Figure 1 The vehicle 1 shown in the figure can also be any electric device using the battery device 10.

[0217] The electric device can be any of the above-mentioned application devices or systems using the battery device 10.

[0218] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10, comprising a plurality of battery cells 20, the battery cell 20 being the battery cell 20 in any of the above embodiments.

[0219] According to some embodiments of the present application, the embodiments of the present application further provide a battery device 10, comprising a plurality of battery cells 20, the battery cell 20 being the battery cell 20 in any of the above embodiments. Figure 3 to Figure 17The application provides a battery monomer 20, which comprises an electrode assembly 22, a shell 211, a pressure relief mechanism 213 and a support plate assembly 23; the shell 211 comprises a first containing space 26, the electrode assembly 22 is contained in the first containing space 26, the shell 211 has a first wall 50, the first wall 50 is provided with a pressure relief hole 60 penetrating through the first wall 50, the pressure relief hole 60 is communicated with the first containing space 26; the pressure relief mechanism 213 is contained in the pressure relief hole 60 and connected to the shell 211; the support plate assembly 23 is fixed in a space between the electrode assembly 22 and the first wall 50, the support plate assembly 23 comprises a main body part 231 and a support part 232, the support part 232 is located on a side of the main body part 231 away from the electrode assembly 22, a gas exhaust channel communicated with the pressure relief mechanism 213 is formed between the main body part 231 and the first wall 50; wherein the melting point of the material of the support part 232 is greater than the melting point of the material of the main body part 231. The melting point of the material of the support part 232 is greater than or equal to 200 DEG C. The main body part 231 comprises a first main body part 2311 and a first extension part 2312, the first extension part 2312 is connected to a side of the first main body part 2311 facing the first wall 50, and the first extension part 2312 covers all surfaces of the support part 232 away from the first main body part 2311. The support part 232 is provided with a first groove 234 with an opening facing the first main body part 2311, and / or the support part 232 is provided with a first through hole 235 penetrating through the support part 232 along the thickness direction of the support part 232, wherein the main body part 231 comprises a second extension part 2313 connected to a side of the first main body part 2311 facing the first wall 50, at least part of the second extension part 2313 is contained in the first groove 234, and / or at least part of the second extension part 2313 is contained in the first through hole 235. The main body part 231 and the support part 232 are integrally injection molded.

[0220] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and description of the application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The electrode assembly (22) is accommodated in a first accommodation space (26) of a housing (211), the housing (211) has a first wall (50) provided with a pressure relief hole (60) penetrating the first wall (50) and communicating with the first accommodation space (26), a pressure relief mechanism (213) is accommodated in the pressure relief hole (60) and connected to the housing (211), and a support plate assembly (23) is fixed in a space between the electrode assembly (22) and the first wall (50), the support plate assembly (23) includes a main body portion (231) and a support portion (232) located on a side of the main body portion (231) away from the electrode assembly (22), and an exhaust passage communicating with the pressure relief mechanism (213) is formed between the main body portion (231) and the first wall (50). The melting point of the material of the support portion (232) is greater than the melting point of the material of the main body portion (231). The melting point of the material of the support portion (232) is greater than or equal to 200°C. The main body portion (231) includes a first main body portion (2311) and a first extension portion (2312) connected to a side of the first main body portion (2311) facing the first wall (50), and the first extension portion (2312) covers at least part of the surface of the support portion (232) away from the first main body portion (2311). The first extension portion (2312) covers the entire surface of the support portion (232) away from the first main body portion (2311). The support portion (232) is provided with a first groove (234) with an opening facing the first main body portion (2311), and / or the support portion (232) is provided with a first through hole (235) penetrating the support portion (232) in the thickness direction of the support portion (232), 2. The battery cell of claim 1, wherein, The main body portion (231) includes a second extension portion (2313) connected to a side of the first main body portion (2311) facing the first wall (50), at least part of the second extension portion (2313) is accommodated in the first groove (234), and / or at least part of the second extension portion (2313) is accommodated in the first through hole (235).

3. The battery cell of claim 1, wherein, In the direction of the thickness of the main body portion (231) and toward the first wall (50), the size of the first groove (234) and / or the first through hole (235) in the direction perpendicular to the thickness of the main body portion (231) gradually increases.

4. The battery cell of claim 3, wherein, The main body portion (231) and the support portion (232) are integrally injection molded.

5. The battery cell of claim 3, wherein, The minimum thickness of the support plate assembly (23) is greater than or equal to 0.1 mm. ​ 6. The battery cell of claim 5, wherein, ​ 7. The battery cell according to any one of claims 3 to 6, characterized in that, ​ 8. The battery cell of claim 7, wherein, ​ 9. The battery cell according to claim 1 or 2, characterized in that, The battery cell further includes an insulating member (24) that encloses a second accommodation space (27) with the main body portion (231), the electrode assembly (22) being accommodated in the second accommodation space (27), a surface of the support portion (232) on a side facing away from the main body portion (231) being fixedly connected to a surface of the first wall (50) on a side facing the inside of the battery cell, and a surface of the main body portion (231) on a side facing away from the electrode assembly (22) abutting against a surface of the support portion (232) on a side facing away from the first wall (50).

10. The battery cell of claim 9, wherein, The main body portion (231) is integrally formed with the insulating member (24).

11. The battery cell of claim 9, wherein, The surface of the support portion (232) on the side facing away from the main body portion (231) is weldedly connected to the surface of the first wall (50) on the side facing the inside of the battery cell.

12. The battery cell of any one of claims 1 to 6, wherein, The main body portion (231) further includes an exhaust hole (233) that penetrates the main body portion (231) in a thickness direction of the main body portion (231), and a projection of the exhaust hole (233) on a plane perpendicular to the thickness direction of the main body portion (231) does not overlap with a projection of the support portion (232) on the plane.

13. The battery cell of any one of claims 1 to 6, wherein, The material of the support portion (232) is one of aluminum, copper, or stainless steel.

14. The battery cell of any one of claims 1 to 6, wherein, The material of the main body portion (231) is polypropylene or polyethylene terephthalate.

15. The battery cell of any one of claims 1 to 6, wherein, The material of the housing (211) is steel or titanium.

16. A battery device characterized by comprising: Comprising: A plurality of battery cells as claimed in any one of claims 1 to 15.

17. An electrical device, comprising: Comprising: A battery device as claimed in claim 16, the battery device being configured to provide electrical energy to the electrical device.

18. An energy storage device, characterized by Comprising: A battery device as claimed in claim 16, the battery device being configured to store electrical energy for the energy storage device.

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