Battery monomer, battery device and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a single battery, a battery device and electric equipment, the single battery comprises a shell, an electrode assembly, a current collecting disc and an insulating part, and the shell is provided with an accommodating cavity and a first wall; the electrode assembly is arranged in the accommodating cavity; the current collecting disc is arranged in the accommodating cavity, the current collecting disc is located between the electrode assembly and the first wall, and the current collecting disc and the shell are opposite in electrical property; the insulating part is arranged in the containing cavity and located between the current collecting disc and the first wall, the melting point of the insulating part is Tm, and Tm is larger than or equal to 300 DEG C. The probability of melting deformation of the insulating part under the condition of thermal runaway is low, and the insulating part maintains the initial state so as to continuously and effectively insulate and isolate the current collecting disc and the first wall, so that the contact between the shell and the current collecting disc under the condition of thermal runaway is prevented to a certain extent, and the abnormal short circuit condition of the battery monomer is avoided to a certain extent.

Description

Technical Field

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

[0002] Battery cells can be used to store or provide electrical energy. Battery cells can be used in electrical devices. For example, battery cells can be used in vehicles or energy storage devices, etc.

[0003] In the related art, a cylindrical battery cell is taken as an example. The cylindrical battery cell includes a shell and a current collecting plate. The shell is usually negatively charged and the current collecting plate is positively charged. In the case of thermal runaway of the battery cell, the current collecting plate and the shell are easily in contact, resulting in a short circuit. Utility Model Content

[0004] In view of this, the embodiments of the present application hope to provide a battery cell, a battery device and an electrical equipment, in which the probability of the insulating component melting and deforming in the case of thermal runaway is low, and abnormal short circuits in the battery cell can be avoided to a certain extent.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0006] The present application provides a battery cell, including:

[0007] A housing having a receiving cavity and a first wall;

[0008] An electrode assembly is disposed in the accommodating cavity;

[0009] A current collecting plate is disposed in the accommodating cavity, the current collecting plate is located between the electrode assembly and the first wall, and the current collecting plate and the housing have opposite electrical properties;

[0010] An insulating member is disposed in the accommodating cavity, the insulating member is located between the collecting plate and the first wall, and the melting point of the insulating member is Tm, where Tm is ≥ 300°C.

[0011] In the battery cell provided in the embodiment of the present application, the insulating member is located between the collector plate and the first wall, that is, the insulating member insulates and isolates the collector plate and the first wall. When the battery cell is in a normal state, the insulating member can effectively insulate and prevent the collector plate from contacting the outer shell to a certain extent. In the event of thermal runaway of the battery cell, the temperature inside the outer shell rises to 200°C to 250°C. Since the melting point of the insulating member is not less than 300°C, the probability of the insulating member melting and deforming in the event of thermal runaway is low. The insulating member maintains its initial shape to continue to effectively insulate and isolate the collector plate and the first wall, and prevents the outer shell and the collector plate from contacting in the event of thermal runaway to a certain extent, thereby avoiding abnormal short circuits in the battery cell to a certain extent.

[0012] In some embodiments, 320°C ≤ Tm ≤ 3000°C.

[0013] In this embodiment, the higher melting point of the insulating component can further reduce the risk of melting deformation of the insulating component and improve the insulation reliability of the insulating component.

[0014] In some embodiments, a direction perpendicular to the first wall is a first direction, a plane perpendicular to the first direction is a projection plane, and a projection of the insulating member covers a projection of the collecting plate; and / or,

[0015] A direction perpendicular to the first wall is a first direction, a plane perpendicular to the first direction is a projection plane, and a projection of the insulating member covers a projection of the first wall.

[0016] In this embodiment, the projected area of ​​the insulating member may be greater than or equal to the projected area of ​​the current collecting plate. In this way, the insulating member can completely block the current collecting plate, and more effectively isolate the first wall and the current collecting plate. The projected area of ​​the insulating member may be greater than or equal to the projected area of ​​the first wall. In this way, the insulating member can completely block the first wall, and more effectively isolate the first wall and the current collecting plate.

[0017] In some embodiments, the thickness of the insulating member is 0.01 mm to 2 mm.

[0018] In this embodiment, the thickness of the insulating member refers to the size of the insulating member along the first direction. The moderate thickness of the insulating member is not only convenient for manufacturing and molding, but also takes into account strength, and can effectively insulate and isolate the collector plate and the first wall without excessively occupying the space in the accommodating cavity.

[0019] In some embodiments, the insulating member is a ceramic structure, a rock wool structure or a polyimide structure.

[0020] In this embodiment, ceramics, rock wool and polyimide all have good insulation performance and temperature resistance.

[0021] In some embodiments, the insulating member is spaced apart from or abuts against the first wall, and the insulating member is spaced apart from or abuts against the current collecting plate.

[0022] In this embodiment, the insulating part can be an independent component, the insulating part can be independent of the shell and the collecting plate, and the insulating part can be manufactured and formed before being assembled. This design can reduce the difficulty of manufacturing the insulating part and can also set the shape of the insulating part according to requirements.

[0023] In some embodiments, the insulating member is attached to the first wall; or, the insulating member is attached to a surface of the collecting plate facing the first wall.

[0024] In this embodiment, the insulating member is connected to the first wall by adhesion, the insulating member is synchronously connected to the first wall during the manufacturing process, the housing provides support for the insulating member, and no assembly step is required between the insulating member and the first wall. With such a design, the assembly step of the insulating member can be saved. The insulating member is connected to the surface of the first side of the current collecting plate facing the first direction by adhesion, the insulating member is synchronously connected to the current collecting plate during the manufacturing process, the current collecting plate provides support for the insulating member, and no assembly step is required between the insulating member and the current collecting plate. With such a design, the assembly step of the insulating member can be saved.

[0025] In some embodiments, the insulating member is a spray-molded structure, a deposition-molded structure, or an anodized-molded structure.

[0026] In this embodiment, the insulating member can be attached to the surface of the first wall or the current collecting plate by spraying, deposition or anodizing. The insulating member has good adhesion so as to form a film more uniformly on the surface of the first wall or the current collecting plate.

[0027] In some embodiments, the battery cell includes a pole, the pole is disposed on the first wall, and the current collecting plate is connected to the pole.

[0028] In this embodiment, the pole is arranged on the first wall, and the distance between the pole and the current collecting plate is relatively close, so that the pole and the current collecting plate are connected easily and the structure is more compact.

[0029] In some embodiments, the housing includes an end cover and a shell, the end cover and the shell together define the accommodating cavity, and the end cover has the first wall.

[0030] In this embodiment, the pole can be arranged on the end cover, thus reducing the difficulty of manufacturing and installing the pole.

[0031] In some embodiments, the housing includes an end cover and a shell, the end cover and the shell together define the accommodating cavity, the shell has the first wall, and the shell and the pole are an integrally formed structure.

[0032] In this embodiment, the housing and the pole are an integrally formed structure, which can save the assembly process between the housing and the pole and improve production efficiency.

[0033] An embodiment of the present application provides a battery device, comprising any one of the battery cells described above.

[0034] The battery device provided in the embodiment of the present application includes the battery cell provided in the embodiment of the present application, and has the same or corresponding beneficial effects as the battery cell.

[0035] An embodiment of the present application provides an electrical device, comprising any one of the battery cells described above or the battery device described above, wherein the battery cell is used to store or provide electrical energy, and the battery device is used to store or provide electrical energy.

[0036] The electric device provided in the embodiment of the present application includes the battery cell provided in the embodiment of the present application, and has the same or corresponding beneficial effects as the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of a vehicle in an embodiment of the present application;

[0038] Figure 2 This is a schematic structural diagram of a first battery cell in an embodiment of the present application;

[0039] Figure 3 for Figure 2 An exploded schematic diagram of a first battery cell is shown;

[0040] Figure 4 for Figure 2 A schematic diagram of the first battery cell from another perspective is shown;

[0041] Figure 5 for Figure 4 Schematic cross-sectional view in the AA direction;

[0042] Figure 6 is a cross-sectional schematic diagram of a second battery cell in an embodiment of the present application;

[0043] Figure 7 It is a cross-sectional schematic diagram of a third battery cell in an embodiment of the present application.

[0044] Description of Reference Numerals

[0045] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 1, battery cell; 11, housing; 11a, accommodating chamber; 11aa, first wall; 111, end cover; 112, shell; 12, electrode assembly; 13, collecting plate; 14, insulating member; 14a, perforation; 15, pole. DETAILED DESCRIPTION

[0046] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0048] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features.

[0049] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0050] It should be noted that, in the present application, at least two includes a number of two and more than two. A plurality includes a number of two and more than two. The unit "℃" is degrees Celsius. The unit "mm" is millimeter. The first direction is represented by X, wherein the first side of the first direction is represented by X1, and the second side of the first direction is represented by X2, and the first side X1 and the second side X2 are opposite sides of the first direction.

[0051] See also Figures 1 to 7 To facilitate understanding of the battery cell 1, the battery device 100 and the electrical equipment provided in the embodiment of the present application, some basic structures of the battery cell 1, the battery device 100 and the electrical equipment provided in the embodiment of the present application are first introduced.

[0052] The battery device 100 provided in the embodiment of the present application includes the battery cell 1 in any one of the embodiments of the present application.

[0053] The number of battery cells 1 can be one or more, and the battery cells 1 are used to provide voltage and capacity. Multiple battery cells 1 can be connected in series, in parallel, or in mixed series through a busbar component. The busbar component is used to achieve electrical connection between at least two battery cells 1.

[0054] Exemplarily, hybrid connection means that at least two battery cells 1 are both connected in series and in parallel. At least two battery cells 1 can be directly connected in series, in parallel, or in hybrid connection; of course, at least two battery cells 1 can be first connected in series, in parallel, or in hybrid connection to form a module, and the module can then be connected in series, in parallel, or in hybrid connection to form a whole.

[0055] In the embodiment of the present application, the battery cell 1 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0056] The battery cell 1 can be a lithium ion battery cell, a sodium ion battery cell, a sodium lithium ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium sulfur battery cell, a magnesium ion battery cell, a nickel hydrogen battery cell, a nickel cadmium battery cell or a lead storage battery cell, etc., which is not limited in the embodiments of the present application.

[0057] See also Figure 1 The battery cell 1 includes a shell 11, and the shape of the shell 11 can be cylindrical or prismatic. The battery cell 1 with a cylindrical shell 1 can also be called a cylindrical battery cell 1. The battery cell 1 with a prismatic shell 1 can also be called a multi-prism battery cell 1. The multi-prism battery cell 1 is, for example, a hexagonal battery cell 1, etc., and there is no special limitation in this application. For the cylindrical battery cell 1 and the prismatic battery cell 1, the first direction X can be the length direction of the shell 11.

[0058] The shell 11 may be made of metal. For example, the shell 11 may be a steel shell, an aluminum shell, a composite metal shell (such as a copper-aluminum composite shell), or the like.

[0059] See also Figures 1 to 4 The battery cell 1 includes an electrode assembly 12, and the electrode assembly 12 is arranged in the accommodating cavity 11a of the shell 11. The electrode assembly 12 includes a positive electrode, a negative electrode and a separator, and a separator is arranged between the negative electrode and the positive electrode. During the charging and discharging process of the battery cell 1, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive electrode and the negative electrode from short-circuiting, and at the same time allow active ions to pass through.

[0060] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0061] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0062] As an example, the positive electrode current collector may be 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, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0063] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, lithium iron phosphate (such as LiFePO 4 (also referred to as LFP), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO 4 ), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn 2 O 4 ), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.8 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds. The modified compound refers to a substance obtained by modification means such as doping or coating on the basis of the above substances.

[0064] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0065] As an example, the negative electrode current collector may be 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, etc., may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0066] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0067] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0068] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0069] In some embodiments, the negative electrode may be a foam metal. The foam metal may be foam nickel, foam copper, foam aluminum, foam alloy, or foam carbon, etc. When the foam metal is used as the negative electrode sheet, the surface of the foam metal may not be provided with a negative electrode active material, but of course, a negative electrode active material may also be provided.

[0070] As an example, a negative electrode active material may be filled and / or deposited in the negative electrode current collector.

[0071] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0072] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0073] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without special restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without special restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surface of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be coated on the surface of the separator.

[0074] In some embodiments, the battery cell 1 further includes an electrolyte, which is contained in the housing 11a of the housing 11. The electrolyte plays a role in conducting active ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0075] The liquid electrolyte includes an electrolyte salt and a solvent.

[0076] In some embodiments, the electrolyte salt can be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl imide), lithium bis(trifluoromethanesulfonyl imide), lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate and lithium tetrafluorooxalatophosphate.

[0077] In some embodiments, the solvent can be selected from at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane sulfone, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent can also be selected from ether solvents. Ether solvents can include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0078] In some embodiments, the electrolyte may optionally include additives. For example, the additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell 1, such as additives that improve the overcharge / fast charge performance of the battery cell 1, additives that improve the high temperature performance of the battery cell 1, and additives that improve the low temperature performance of the battery cell 1.

[0079] Among them, the gel electrolyte includes a polymer as a skeleton network and can be used in combination with an ionic liquid-lithium salt.

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

[0081] As examples, the polymer of the polymer solid electrolyte may include polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, a polyionic liquid, cellulose, and the like.

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

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

[0084] In some embodiments, a battery cell assembly (Battery Cell Assembly) is generally formed by arranging a plurality of battery cells 1 .

[0085] As an example, the battery cell assembly may be a battery module (Battery Module), and the battery module is formed by arranging and fixing a plurality of battery cells 1 to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells 1 by a cable tie.

[0086] In some embodiments, the battery device 100 may be a battery pack, which includes a box and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the box.

[0087] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0088] As an example, the battery cell assembly may also be housed in the box by directly fixing a plurality of battery cells 1 to the box.

[0089] As an example, the box may include a first box and a second box. The first box and the second box are buckled together to form a closed space inside the box to accommodate the battery cell assembly. The closed here means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0090] As an example, the box body may include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0091] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0092] See also Figure 1 The electric device provided in the embodiment of the present application includes the battery cell 1 in any embodiment of the present application or the battery device 100 in any embodiment of the present application. The battery cell 1 is used to store or provide electric energy, and the battery device 100 is used to store or provide electric energy.

[0093] Electrical equipment includes but is not limited to energy storage equipment, mobile phones, tablets, laptops, electric toys, electric tools, vehicles, ships or spacecraft, etc. Vehicles may include, electric toys may include battery vehicles and electric cars, etc., fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc.

[0094] In the following embodiments, for the convenience of description, an electric device according to an embodiment of the present application is taken as an example of a vehicle 1000. The following is a description with reference to the accompanying drawings.

[0095] Figure 1 The schematic diagram of the structure of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery device 100 is disposed inside the vehicle 1000, and the battery device 100 can be disposed at the bottom of the vehicle 1000 or at the front or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000, for example, the battery device 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0096] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0097] In the related art, since the electrical properties carried by the collector plate and the shell are opposite, the risk points of short circuit between the shell and the collector plate increase, and the insulation between the collector plate and the shell is one of the keys to battery insulation design. To this end, an insulating material can be set between the shell and the collector plate to reduce the risk of short circuit between the shell and the collector plate. However, in the event of thermal runaway of a battery cell, the temperature inside the shell can reach 200°C to 250°C, and a high temperature and high pressure environment is formed inside the shell. The insulating material may fail due to melting deformation caused by high temperature and high pressure, and the shell and the collector plate may short-circuit, worsening the thermal runaway, and even further increasing the temperature to above 250°C, which may further cause heat diffusion to other battery cells.

[0098] In view of this, an embodiment of the present application provides a battery cell, which includes a shell, an electrode assembly, a current collecting plate and an insulating member, the shell having a accommodating cavity and a first wall, the electrode assembly is arranged in the accommodating cavity, the current collecting plate is arranged in the accommodating cavity, the current collecting plate is located between the electrode assembly and the first wall, and the electrical properties of the current collecting plate and the shell are opposite; the insulating member is arranged in the accommodating cavity, the insulating member is located between the current collecting plate and the first wall, the melting point of the insulating member is Tm, Tm≥300°C.

[0099] In the battery cell provided in the embodiment of the present application, the insulating member is located between the collector plate and the first wall, that is, the insulating member insulates and isolates the collector plate and the first wall. When the battery cell is in a normal state, the insulating member can effectively insulate and prevent the collector plate from contacting the outer shell to a certain extent. In the event of thermal runaway of the battery cell, the temperature inside the outer shell rises to 200°C to 250°C. Since the melting point of the insulating member is not less than 300°C, the probability of the insulating member melting and deforming in the event of thermal runaway is low. The insulating member maintains its initial shape to continue to effectively insulate and isolate the collector plate and the first wall, and prevents the outer shell and the collector plate from contacting in the event of thermal runaway to a certain extent, thereby avoiding abnormal short circuits in the battery cell to a certain extent.

[0100] The following further describes the battery cell 1 provided in the embodiment of the present application in conjunction with the accompanying drawings. Figures 2 to 7 The battery cell 1 includes a housing 11 , an electrode assembly 12 , a current collecting plate 13 and an insulating member 14 .

[0101] The housing 11 has a housing cavity 11a and a first wall 11aa. The housing cavity 11a is used to place the electrode assembly 12, the current collecting plate 13, the insulating member 14, etc. The housing 11 can provide protection for the electrode assembly 12, the current collecting plate 13, the insulating member 14, etc. The first wall 11aa is a side wall of the housing 11 constituting the housing cavity 11a.

[0102] The electrode assembly 12 is disposed in the accommodating cavity 11 a.

[0103] Exemplarily, the electrode assembly 12 includes a positive electrode, a negative electrode and a separator, wherein the separator is disposed between the positive electrode and the negative electrode. The separator is used to separate the positive electrode from the negative electrode to prevent the positive electrode from contacting the negative electrode.

[0104] The current collecting plate 13 is disposed in the accommodating cavity 11 a . The current collecting plate 13 is located between the electrode assembly 12 and the first wall 11 aa . The electrical properties of the current collecting plate 13 and the housing 11 are opposite.

[0105] The opposite electrical properties of the current collecting disc 13 and the housing 11 means that one of the current collecting disc 13 and the housing 11 is positively charged, and the other of the current collecting disc 13 and the housing 11 is negatively charged.

[0106] Exemplarily, the current collecting plate 13 is located at a first side X1 of the electrode assembly 12 along the first direction X.

[0107] As an example, one of the current collecting disc 13 and the housing 11 is electrically connected to the positive electrode, and the other of the current collecting disc 13 and the housing 11 is electrically connected to the negative electrode. In one embodiment, the positive electrode is electrically connected to the current collecting disc 13, and the negative electrode is electrically connected to the housing 11. That is, the current collecting disc 13 is positively charged, and the housing 11 is negatively charged. In another embodiment, the negative electrode is electrically connected to the current collecting disc 13, and the positive electrode is electrically connected to the housing 11. That is, the current collecting disc 13 is negatively charged, and the housing 11 is positively charged.

[0108] The insulating member 14 is disposed in the accommodating cavity 11a, and is located between the current collecting plate 13 and the first wall 11aa. The insulating member 14 insulates and isolates the current collecting plate 13 and the first wall 11aa.

[0109] As an example, the side of the accommodating cavity 11a facing the second side X2 of the first direction X is the first side, and the insulating member 14 is located between the current collecting plate 13 and the first side. That is, the insulating member 14 insulates and isolates the current collecting plate 13 and the first side.

[0110] The melting point of the insulating member 14 is Tm, and Tm ≥ 300° C. In other words, the melting point of the insulating member 14 is not less than 300° C. For example, Tm may be 300° C., 320° C., 350° C., 380° C., 400° C., 450° C., 500° C., 600° C., 700° C., 800° C., 1000° C., or 1500° C., etc.

[0111] The melting point of the insulating member 14 refers to the temperature at which the insulating member 14 changes from a solid state to a liquid state.

[0112] The melting point of the insulating member 14 is well known in the art and can be measured using methods and instruments well known in the art. For example, the melting point of the insulating member 14 can be tested with reference to ASTM_D3418-2015.

[0113] In the battery cell 1 provided in the embodiment of the present application, the insulating member 14 is located between the current collecting plate 13 and the first wall 11aa, that is, the insulating member 14 insulates and isolates the current collecting plate 13 and the first wall 11aa. When the battery cell 1 is in a normal state, the insulating member 14 can effectively insulate and prevent the current collecting plate 13 from contacting the outer shell 11 to a certain extent. In the case of thermal runaway of the battery cell 1, the temperature in the outer shell 11 rises to 200°C to 250°C. Since the melting point of the insulating member 14 is not less than 300°C, the probability of the insulating member 14 melting and deforming in the case of thermal runaway is low. The insulating member 14 maintains its initial shape to continue to effectively insulate and isolate the current collecting plate 13 and the first wall 11aa, and prevents the outer shell 11 and the current collecting plate 13 from contacting in the case of thermal runaway to a certain extent, thereby avoiding abnormal short circuit in the battery cell 1 to a certain extent.

[0114] It is understood that the normal state of the battery cell 1 refers to the state in which the battery cell 1 can input and output electrical energy. Thermal runaway refers to a chain reaction phenomenon caused by various inducements. The large amount of heat and harmful gases emitted by thermal runaway will cause the temperature and pressure in the housing 11 to rise.

[0115] In some embodiments, 320° C. ≤ Tm ≤ 3000° C. For example, Tm may be 320° C., 340° C., 360° C., 410° C., 440° C., 550° C., 650° C., 750° C., 900° C., 1600° C., 2000° C., 2500° C., or 3000° C., etc. A higher melting point of the insulating member 14 can further reduce the risk of melting deformation of the insulating member 14 and improve the insulation reliability of the insulating member 14.

[0116] In some embodiments, the first wall 11aa faces the first direction, the direction perpendicular to the first wall 11aa is the first direction, and the plane perpendicular to the first direction X is the projection plane, and the projection of the insulating member 14 covers the projection of the current collecting plate 13. For example, the projection of the insulating member 14 coincides with the projection of the current collecting plate 13. For another example, the projection of the current collecting plate 13 is within the projection range of the insulating member 14. In other words, the projection area of ​​the insulating member 14 can be greater than or equal to the projection area of ​​the current collecting plate 13. In this way, the insulating member 14 can completely block the current collecting plate 13, and more effectively isolate the first wall 11aa and the current collecting plate 13.

[0117] In some embodiments, the first wall 11aa faces the first direction, the direction perpendicular to the first wall 11aa is the first direction, and the plane perpendicular to the first direction X is the projection plane, and the projection of the insulating member 14 covers the projection of the first wall 11aa. For example, the projection of the insulating member 14 coincides with the projection of the first wall 11aa. For another example, the projection of the first wall 11aa is located within the projection range of the insulating member 14. In other words, the projection area of ​​the insulating member 14 can be greater than or equal to the projection area of ​​the first wall 11aa. In this way, the insulating member 14 can completely block the first wall 11aa, and more effectively isolate the first wall 11aa and the collecting plate 13.

[0118] For some examples, see Figure 5 , the thickness H of the insulating member 14 is 0.01 mm to 2 mm. Exemplarily, the thickness H of the insulating member 14 is 0.01 mm, 0.05 mm, 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 1.9 mm or 2 mm, etc. The thickness H of the insulating member 14 refers to the dimension of the insulating member 14 along the first direction X. The thickness H of the insulating member 14 is moderate, which is not only convenient for manufacturing and molding, but also takes into account the strength, and can effectively insulate and isolate the collecting plate 13 and the first wall 11aa, and will not excessively occupy the space in the accommodating cavity 11a.

[0119] In some embodiments, the insulating member 14 is a ceramic structure, a rock wool structure, or a polyimide structure. The insulating member 14 is a ceramic structure, which means that the material of the insulating member 14 is ceramic. The insulating member 14 is a rock wool structure, which means that the material of the insulating member 14 is rock wool. The insulating member 14 is a polyimide structure, which means that the material of the insulating member 14 is polyimide. In other words, the material of the insulating member 14 includes ceramic, rock wool, or polyimide. The melting point of ceramic can reach 2000°C and above. The melting point of rock wool can reach 1000°C and above. The melting point of polyimide can reach about 350°C. Ceramics, rock wool, and polyimide all have good insulation and temperature resistance.

[0120] It is understandable that the material of the insulating isolation layer includes but is not limited to ceramic, rock wool or polyimide.

[0121] In some embodiments, the insulating member 14 includes an insulating isolation layer, that is, the insulating member 14 has a single-layer structure.

[0122] In some embodiments, the insulating member 14 includes at least two insulating isolation layers stacked together, that is, the insulating member 14 is a multi-layer structure.

[0123] In some embodiments, at least two insulating isolation layers are made of the same material. For example, two insulating isolation layers may be made of the same material. For another example, three insulating isolation layers may be made of the same material. For another example, all insulating isolation layers may be made of the same material. The insulating member 14 may be a multi-layer structure made of a single material.

[0124] In some embodiments, at least two insulating isolation layers are made of different materials. For example, two insulating isolation layers may be made of different materials. For another example, three insulating isolation layers may be made of different materials. For another example, all insulating isolation layers may be made of different materials. In other words, the insulating member 14 is made of a plurality of materials to form a multilayer composite material structure. A composite material is a material composed of two or more materials of different properties, which are macroscopically formed into a material with new properties through physical or chemical methods.

[0125] Exemplarily, in some embodiments, the insulating member 14 includes at least two insulating isolation layers stacked together, and all the insulating isolation layers may be ceramic insulating isolation layers.

[0126] For example, in some embodiments, the insulating member 14 includes two stacked insulating isolation layers, one of which may be a ceramic insulating isolation layer, and the other of which may be a polyimide insulating isolation layer.

[0127] It should be noted that at least two layers refers to two layers or more.

[0128] For some examples, see Figure 5, the insulating member 14 is spaced apart from or abuts against the first wall 11aa, and the insulating member 14 is spaced apart from or abuts against the current collecting plate 13. That is to say, the insulating member 14 is not attached to the first wall 11aa and the current collecting plate 13. With such a design, the insulating member 14 can be an independent component, the insulating member 14 can be independent of the housing 11 and the current collecting plate 13, and the insulating member 14 can be manufactured and formed before being assembled. With such a design, the manufacturing difficulty of the insulating member 14 can be reduced, and the shape of the insulating member 14 can also be set according to requirements.

[0129] It should be noted that the insulating member 14 can be an independent component, which means that the insulating member 14 is manufactured and formed independently of the housing 11 and the current collecting plate 13, and the insulating member 14 is first manufactured and formed and then assembled between the housing 11 and the current collecting plate 13. For example, after the insulating member 14 is manufactured and formed, it is fixedly connected to the pole 15. The pole 15 provides support for the insulating member 14. For example, the insulating member 14 as an independent component can adopt a ceramic structure, a rock wool structure or a polyimide structure.

[0130] For some examples, see Figure 5 , the insulating member 14 is spaced apart from the first wall 11aa, and the insulating member 14 is spaced apart from the current collecting plate 13. That is, there is a gap between the insulating member 14 and the first wall 11aa, there is a gap between the insulating member 14 and the current collecting plate 13, and the insulating member 14 will not adhere to the first wall 11aa and the current collecting plate 13.

[0131] For some examples, see Figure 6 , the insulating member 14 is attached to the first wall 11aa. That is, the insulating member 14 is connected to the first wall 11aa by adhesion, the insulating member 14 is synchronously connected to the first wall 11aa during the manufacturing process, the housing 11 provides support for the insulating member 14, and no assembly steps are required between the insulating member 14 and the first wall 11aa. This design can save assembly steps for the insulating member 14.

[0132] It can be understood that adhesion is the mutual attraction between two different substances in contact. This attraction is a manifestation of the mutual attraction between the molecules of the two substances.

[0133] For some examples, see Figure 7 , the insulating member 14 is attached to the surface of the current collecting plate 13 facing the first wall 11aa. That is, the insulating member 14 is attached to the surface of the current collecting plate 13 facing the first side X1 of the first direction X. That is, the insulating member 14 is connected to the surface of the current collecting plate 13 facing the first side X1 of the first direction X by adhesion, and the insulating member 14 is synchronously connected to the current collecting plate 13 during the manufacturing process, and the current collecting plate 13 provides support for the insulating member 14, and no assembly steps are required between the insulating member 14 and the current collecting plate 13. With such a design, the assembly steps of the insulating member 14 can be saved.

[0134] It can be understood that the surface of the current collecting plate 13 facing the first side X1 of the first direction X refers to the surface of the current collecting plate 13 facing away from the electrode assembly 12 .

[0135] In some embodiments, the insulating member 14 is a spray-molded structure, a deposition-molded structure, or an anodized-molded structure.

[0136] The spray-molded structure refers to a structure formed by a spraying process, which is a coating method in which the insulating material is dispersed into uniform and fine droplets by pressure or centrifugal force and applied to the surface of the object to be coated (the surface of the first wall 11aa or the surface of the collecting plate 13).

[0137] Deposition-molded structures refer to structures formed by a deposition process. A deposition process is a process of coating a film by evaporation or sputtering, such as chemical vapor deposition, physical vapor deposition, etc.

[0138] The anodized structure refers to a structure formed by an anodizing process, wherein the anodizing process uses the side wall of the housing 11 facing the first side X1 or the current collecting plate 13 as an anode and performs electrochemical plating.

[0139] In this embodiment, the insulating member 14 can be attached to the surface of the first wall 11aa or the surface of the collecting plate 13 by spraying, deposition or anodizing. The insulating member 14 has good adhesion to facilitate more uniform film formation on the surface of the first wall 11aa or the surface of the collecting plate 13.

[0140] In some embodiments, the material of the insulating member 14 may also be a metal oxide or a resin, etc., and the metal aluminum oxide includes but is not limited to aluminum oxide, etc. Exemplarily, the metal oxide may be formed into the insulating member 14 by anodization or deposition. The resin may be formed into the insulating member 14 by spraying or deposition. The positive electrode, the separator, and the negative electrode may be wound to form the electrode assembly 12. The winding direction of the positive electrode, the separator, and the negative electrode is the direction of the straight line extending along the first direction X. That is, the electrode assembly 12 may be a wound structure.

[0141] In some embodiments, the shape of the electrode assembly 12 may be cylindrical or prismatic.

[0142] In some embodiments, the electrode assembly 12 is provided with a tab, which can lead current from the electrode assembly 12. The tab includes a positive tab and a negative tab. The positive electrode is provided with a positive tab, and the negative electrode is provided with a negative tab. The positive tab can be electrically connected to the current collecting plate 13, and the negative tab can be electrically connected to the housing 11.

[0143] There is no limitation on the connection method between the positive electrode tab and the current collecting plate 13. Exemplarily, the connection method includes but is not limited to welding.

[0144] The connection method between the negative electrode tab and the housing 11 is not limited. Exemplarily, the battery cell 1 includes a negative electrode current collector, the negative electrode tab is electrically connected to the negative electrode current collector, and the negative electrode current collector is electrically connected to the housing 11.

[0145] The negative electrode current collector has a conductive function, and the negative electrode current collector can be made of a conductive material, for example, a conductive metal material, such as aluminum or copper.

[0146] As an example, the negative electrode current collector is disposed on the second side X2 of the electrode assembly 12 along the first direction X, the negative electrode tab is welded to the negative electrode current collector, and the negative electrode current collector is welded to the housing 11 .

[0147] For some examples, see Figures 2 to 7 The battery cell 1 includes a pole 15, which is disposed on the first wall 11aa, and the current collecting plate 13 is connected to the pole 15. The pole 15 is used to electrically connect the current collecting plate 13 and an external electrical device. As an example, the pole 15 can be electrically connected to an external current collecting component to achieve series connection, parallel connection or mixed connection between multiple battery cells 1.

[0148] In this embodiment, the pole 15 is disposed on the first wall 11aa, and the distance between the pole 15 and the current collecting plate 13 is relatively close, so that the pole 15 and the current collecting plate 13 are connected easily, and the structure is more compact.

[0149] For some examples, see Figures 2 to 7 The housing 11 includes an end cover 111 and a shell 112 . The end cover 111 and the shell 112 together define a receiving cavity 11 a . The end cover 111 has a first wall 11 aa . That is, the pole 15 is disposed on the end cover 111 .

[0150] Exemplarily, the end cover 111 and the housing 112 are independent components, that is, the end cover 111 and the housing 112 are separately manufactured components. The end cover 111 and the housing 112 can be fixed by welding or other methods.

[0151] In this embodiment, the pole 15 can be arranged on the end cover 111 , so that the difficulty of manufacturing and installing the pole 15 can be reduced.

[0152] In some embodiments, the housing 11 includes an end cover 111 and a shell 112 . The end cover 111 and the shell 112 together define a receiving cavity 11 a . The shell 112 has a first wall 11 aa . The shell 112 and the pole 15 are an integrally formed structure.

[0153] In this embodiment, the housing 112 and the pole 15 are an integrally formed structure, which can save the assembly process between the housing 112 and the pole 15 and improve production efficiency.

[0154] For some examples, see Figures 2 to 7 The housing 11 is formed with a relief opening, the insulating member 14 is formed with a through hole 14a, the pole 15 is passed through the relief opening and the through hole 14a, and one end of the pole 15 is electrically connected to the current collecting plate 13. As an example, the relief opening can be formed in the end cover 111. The other end of the pole 15 located outside the housing 11 can be used to electrically connect an external electrical device to electrically conduct the electrode assembly 12 and the external electrical device.

[0155] The collecting plate 13 has a conductive function, and the collecting plate 13 can be made of a conductive material. For example, the collecting plate 13 can be made of a conductive metal material, such as aluminum or copper.

[0156] Taking the plane perpendicular to the first direction X as the projection plane, the outer contour shape of the projection of the collecting plate 13 on the projection plane is not limited. For example, the outer contour shape of the projection of the collecting plate 13 on the projection plane can be circular or elliptical.

[0157] Taking the plane perpendicular to the first direction X as the projection plane, the outer contour shape of the projection of the insulating member 14 on the projection plane is not limited. For example, the outer contour shape of the projection of the insulating member 14 on the projection plane can be circular or elliptical.

[0158] The shape of the through hole 14 a may match the shape of the pole 15 . For example, the shape of the pole 15 may be cylindrical, and the shape of the through hole 14 a may be a circular hole.

[0159] The housing 11 is insulated from the pole 15. That is, there is no electrical conduction between the housing 11 and the pole 15. For example, an insulating ring may be sleeved on the outer periphery of the pole 15, and the outer periphery of the insulating ring contacts the wall of the avoidance opening. In this way, the insulating ring isolates the pole 15 from the housing 11 to prevent electrical conduction between the housing 11 and the pole 15.

[0160] In some embodiments, the battery cell 1 includes an insulating wrapper, which wraps the electrode assembly 12 around the periphery in the first direction X. The insulating wrapper can prevent the periphery of the electrode assembly 12 from contacting the housing 11 .

[0161] It should be noted that the outer periphery of the electrode assembly 12 refers to the direction of the electrode assembly 12 surrounding the straight line extending along the first direction X.

[0162] The insulating wrapping piece has an insulating function, and the material of the insulating wrapping piece includes but is not limited to polypropylene and / or Mylar film (also known as blue film) and the like.

[0163] The insulation wrapping piece may include a wrapping film layer or at least two wrapping film layers. Exemplarily, in some embodiments, the insulation wrapping piece may use a polypropylene wrapping film layer or a Mylar film wrapping film layer. In some embodiments, the insulation wrapping piece may include two wrapping film layers, one of which may be a polypropylene wrapping film layer, and the other may be a Mylar film wrapping film layer, and the Mylar film wrapping film layer may be coated on the outer periphery of the polypropylene wrapping film layer.

[0164] It should be noted that at least two layers of wrapping film layers refer to the number of wrapping film layers being two or more. In some embodiments, the housing 11 includes an end cap 111, a cover, and a shell 112. The shell 112 is a hollow structure with openings on both sides along the first direction X. The end cap 111 closes the opening of the shell 112 toward the first side X1, and the cover closes the opening of the shell 112 toward the second side X2, so as to jointly define the accommodating cavity 11a. The end cap 111 is located on the first side X1 of the electrode assembly 12, the cover is located on the second side X2 of the electrode assembly 12, and the side of the end cap 111 facing the electrode assembly 12 is the first wall 11aa.

[0165] In some embodiments, a pressure relief mechanism is provided on the housing 11 , and is used to discharge the internal gas of the battery cell 1 .

[0166] As an example, when the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 1 reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode, negative electrode, electrolyte and separator in the battery cell 1.

[0167] In a specific embodiment, please refer to Figures 2 to 5 The battery cell 1 includes a housing 11, an electrode assembly 12, a current collecting disc 13 and an insulating member 14. The housing 11 has a housing cavity 11a and a first wall 11aa. The current collecting disc 13 is arranged in the housing cavity 11a. The current collecting disc 13 is located between the electrode assembly 12 and the first wall 11aa. The electrical properties of the current collecting disc 13 and the housing 11 are opposite. 320°C≤Tm≤3000°C. Taking the plane perpendicular to the first direction X as the projection plane, the projection of the insulating member 14 covers the projection of the current collecting disc 13, and the projection of the insulating member 14 covers the projection of the first wall 11aa. The thickness H of the insulating member 14 is 0.01mm to 2mm. The insulating member 14 is spaced apart from the first wall 11aa, and the insulating member 14 is spaced apart from the current collecting disc 13.

[0168] In this embodiment, 320°C≤Tm≤3000°C, the higher melting point of the insulating member 14 can further reduce the risk of melting deformation of the insulating member 14, and improve the insulation reliability of the insulating member 14. Taking the plane perpendicular to the first direction X as the projection plane, the projection of the insulating member 14 covers the projection of the current collecting plate 13, and the projection of the insulating member 14 covers the projection of the first wall 11aa, and the insulating member 14 can completely block the current collecting plate 13 and the first wall 11aa, and can more effectively isolate the first wall 11aa and the current collecting plate 13. The thickness H of the insulating member 14 is 0.01mm to 2mm, and the thickness H of the insulating member 14 is moderate, which is not only convenient for manufacturing and molding, but also takes into account the strength, and can effectively insulate and isolate the current collecting plate 13 and the first wall 11aa, and will not excessively occupy the space in the accommodating cavity 11a. The insulating part 14 can be an independent component. The insulating part 14 can be independent of the housing 11 and the collecting plate 13. The insulating part 14 can be manufactured and then assembled. This design can reduce the manufacturing difficulty of the insulating part 14 and can also set the shape of the insulating part 14 according to needs.

[0169] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way.

Claims

1. A battery cell, characterized in that: include: A housing having a receiving cavity and a first wall; An electrode assembly is disposed in the accommodating cavity; A current collecting plate is disposed in the accommodating cavity, the current collecting plate is located between the electrode assembly and the first wall, and the current collecting plate and the housing have opposite electrical properties; An insulating member is disposed in the accommodating cavity, the insulating member is located between the collecting plate and the first wall, and the melting point of the insulating member is Tm, where Tm is ≥ 300°C.

2. The battery cell according to claim 1, characterized in that: 320℃≤Tm≤3000℃.

3. The battery cell according to claim 1, characterized in that: The direction perpendicular to the first wall is the first direction, the plane perpendicular to the first direction is the projection plane, and the projection of the insulating member covers the projection of the collecting plate; and / or, A direction perpendicular to the first wall is a first direction, a plane perpendicular to the first direction is a projection plane, and a projection of the insulating member covers a projection of the first wall.

4. The battery cell according to claim 1, characterized in that: The thickness of the insulating member is 0.01 mm to 2 mm.

5. The battery cell according to claim 1, characterized in that: The insulating member is a ceramic structure, a rock wool structure or a polyimide structure.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The insulating member is spaced apart from or abuts against the first wall, and the insulating member is spaced apart from or abuts against the current collecting plate.

7. The battery cell according to any one of claims 1 to 4, characterized in that: The insulating member is attached to the first wall; or, the insulating member is attached to a surface of the collecting plate facing the first wall.

8. The battery cell according to claim 7, characterized in that: The insulating member is a spray-molded structure, a deposition-molded structure or an anodized-molded structure.

9. The battery cell according to any one of claims 1 to 5, characterized in that: The battery cell includes a pole, the pole is arranged on the first wall, and the current collecting plate is connected to the pole.

10. The battery cell according to claim 9, characterized in that: The housing includes an end cover and a shell, wherein the end cover and the shell together define the accommodating cavity, and the end cover has the first wall.

11. The battery cell according to claim 9, characterized in that: The housing comprises an end cover and a shell, wherein the end cover and the shell together define the accommodating cavity, the shell has the first wall, and the shell and the pole are an integrally formed structure.

12. A battery device, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 11.

13. An electrical equipment, characterized in that: The invention comprises the battery cell according to any one of claims 1 to 11 or the battery device according to claim 12, wherein the battery cell is used to store or provide electrical energy, and the battery device is used to store or provide electrical energy.

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