Battery cell, battery device, and electric device

Abstract

The invention provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an electrode terminal, an electrode assembly, a current collecting part and a first insulating part, the shell is provided with a first wall, and the electrode terminal is arranged on the first wall. The electrode assembly is contained in the shell and comprises an electrode body and a tab, and the tab is led out from the end, in the thickness direction of the first wall, of the electrode body. The current collector is arranged in the shell, electrically connected with the tab and the electrode terminal and provided with a welding part, and the welding part is connected with the electrode terminal in a welded mode. The first insulating part is arranged on the side, opposite to the electrode terminal, of the welding part and comprises a first part, the first part is arranged on the side, facing the electrode body, of the first insulating part, and the Young modulus E of the first part is larger than or equal to 0.5 MPa and smaller than or equal to 3 MPa. According to the battery monomer provided by the invention, the risk of damaging the electrode assembly by the first insulating part is reduced, the risk of short circuit in the battery monomer is reduced, and the reliability of the battery monomer is improved.

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 device. Background Art

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

[0003] In the development of battery cell technology, in addition to improving the performance of battery cells, the reliability of battery cells is also an issue that needs to be considered. Therefore, how to improve the reliability of battery cells is an issue of continuous improvement in battery device technology. Summary of the invention

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

[0005] This application is achieved through the following technical solutions: In the first aspect, the battery cell provided in the embodiment of the present application includes a shell, an electrode terminal, an electrode assembly, a current collector and a first insulating member. The shell has a first wall, and the electrode terminal is arranged on the first wall. The electrode assembly is accommodated in the shell, and the electrode assembly includes an electrode body and a pole ear, and the pole ear is led out from the end of the electrode body along the thickness direction of the first wall. The current collector is arranged in the shell, and the current collector electrically connects the pole ear and the electrode terminal. The current collector has a welding portion, and the welding portion is welded to the electrode terminal. The first insulating member is arranged on the side of the welding portion facing away from the electrode terminal, and the first insulating member includes a first part, and the first part is arranged on the side of the first insulating member facing the electrode body, and the Young's modulus E of the first part satisfies: 0.5MPa≤E≤3MPa.

[0006] The battery cell provided in the embodiment of the present application is configured such that the Young's modulus E of the first part satisfies: 0.5MPa≤E≤3MPa. When the outer shell is deformed, the first insulating part is displaced accordingly. When the first wall of the first insulating part contacts and squeezes the electrode assembly, the first part can produce a larger deformation. The squeezing force of the first insulating part on the electrode assembly can be reduced through the deformation of the first part. In this way, while improving the structural stability of the first insulating part, it is also beneficial to reduce the risk of the first insulating part damaging the electrode assembly, thereby further improving the reliability of the battery cell.

[0007] According to some embodiments of the present application, 0.5 MPa≤E≤1.1 MPa.

[0008] In the above scheme, setting 0.5MPa≤E≤1.1MPa is beneficial to improving the structural stability of the first insulating member, while also helping to further increase the deformation of the first portion when it is squeezed with the electrode body, further reducing the risk of the electrode body being damaged by squeezing.

[0009] According to some embodiments of the present application, the first insulating member further includes a bonding portion connecting the first portion and the welding portion.

[0010] In the above scheme, the first insulating part is provided to include a bonding part, which facilitates the connection between the first part and the welding part, facilitates the processing of the first part, and also facilitates the control of the surface morphology of the first part, reduces the height of the peak on the first part, and further reduces the risk of the peak on the first part squeezing the electrode body.

[0011] According to some embodiments of the present application, the material of the bonding portion includes at least one of epoxy resin, vinyl acetate resin, polyurethane, acrylic acid and polyvinyl alcohol.

[0012] In the above scheme, epoxy resin, vinyl acetate resin, polyurethane, acrylic acid and polyvinyl alcohol have high corrosion resistance, and epoxy resin, vinyl acetate resin, polyurethane, acrylic acid and polyvinyl alcohol have high structural stability after curing and molding, which is beneficial to improve the structural stability of the first insulating member.

[0013] According to some embodiments of the present application, the first portion and the bonding portion are stacked along a thickness direction.

[0014] In the above solution, it is helpful to improve the bonding stability of the bonding portion to the first portion and the welding portion, and further helps to improve the structural stability of the first insulating member.

[0015] According to some embodiments of the present application, along the thickness direction, the size of the first insulating member is y, the size of the first portion is x1, and 0.2≤x1 / y≤0.8.

[0016] In the above scheme, setting 0.2≤x1 / y≤0.8 is beneficial to improving the bonding stability between the first part and the welding part, while also helping to increase the maximum deformation of the first part, thereby helping to reduce the squeezing pressure of the first part on the electrode body.

[0017] According to some embodiments of the present application, a side of the first portion facing the welding portion has a groove, and the bonding portion is filled in the groove.

[0018] In the above solution, by providing a groove on the side of the first part facing the welding part and filling the groove with the adhesive part, it is helpful to reduce the risk of the adhesive part flowing to other areas before solidification and interfering with other structures.

[0019] According to some embodiments of the present application, the groove is annular.

[0020] In the above scheme, under the premise of providing bonding effect to the first part and the welding part through the bonding part, it is also beneficial to reduce the volume of the first insulating part occupied by the bonding part, so as to increase the volume ratio of the first part in the first insulating part, which is beneficial to further increase the deformation amount that can be generated by the first part under the extrusion state, and further help to reduce the extrusion pressure of the first part on the electrode body, thereby improving the reliability performance of the battery cell.

[0021] According to some embodiments of the present application, along the thickness direction, the size of the first insulating member is y, and the size of the bottom wall of the groove opposite to the bonding portion along the thickness direction is x2, and 0.2≤x2 / y≤0.8.

[0022] In the above scheme, setting 0.2≤x2 / y≤0.8 is beneficial to improving the bonding stability between the first part and the welding part, while also helping to increase the maximum deformation of the first part, thereby helping to reduce the squeezing pressure of the first part on the electrode body.

[0023] According to some embodiments of the present application, the current collecting member has a recessed portion, the recessed portion is recessed toward the electrode terminal, the welding portion is disposed on the bottom wall of the recess, and at least a portion of the first insulating member is disposed in the recess.

[0024] In the above solution, at least part of the first insulating member is arranged in the recess, and the recess can be used to provide a certain limiting effect for the first insulating member, which helps to reduce the risk of the first insulating member moving to other parts and interfering with other structures.

[0025] According to some embodiments of the present application, the material of the first part includes at least one of fluororubber, silicone rubber and polyurethane.

[0026] In the above solution, fluororubber, silicone rubber and polyurethane all have a low elastic modulus, so that when the first part and the electrode body are squeezed, the first part can produce enough deformation to reduce the squeezing of the electrode assembly. In addition, fluororubber, silicone rubber and polyurethane can resist corrosion of the electrolyte, which is conducive to improving the structural stability of the first insulating member.

[0027] According to some embodiments of the present application, the first insulating member covers a side of the welding portion facing away from the electrode terminal.

[0028] In the above scheme, it is helpful to improve the covering effect of the first insulating member on the welding slag on the side of the welding portion facing the electrode assembly, and further helps to reduce the risk of the welding slag falling into the interior of the electrode assembly and damaging the electrode assembly.

[0029] According to some embodiments of the present application, along the thickness direction, the area of ​​the orthographic projection of the first portion on the first wall is S1, the area of ​​the orthographic projection of the welding portion on the first wall is S2, and S1 / S2≥1.2.

[0030] In the above solution, by setting S1 / S2≥1.2, the welding portion and the surrounding adjacent areas can be covered by the first insulating member to further reduce the risk of welding slag entering the interior of the electrode assembly and damaging the electrode assembly.

[0031] According to some embodiments of the present application, the battery cell also includes a second insulating member, which is arranged on the side of the first wall facing the electrode assembly, and the current collecting member is arranged on the side of the second insulating member facing away from the first wall. The second insulating member has a boss protruding toward the electrode body, and the boss is located on one side of the first insulating member along a first direction, and the first direction intersects with the thickness direction; along the first direction, the orthographic projection of the first insulating member is located within the boss.

[0032] In the above scheme, the boss can provide a certain stopping effect on the relative movement between the electrode assembly and the first insulating member, which is beneficial to further reduce the risk of the first part contacting the electrode assembly and crushing the electrode assembly, and further beneficial to improve the structural stability of the electrode assembly.

[0033] According to some embodiments of the present application, the battery cell further includes a cooling unit, which is used to cool the interior of the battery cell, and the cooling unit is disposed on a side of the first insulating member facing away from the current collecting member.

[0034] In the above solution, by providing a cooling unit, it is helpful to cool down the inside of the battery cell, reduce the risk of thermal runaway of the battery cell, and further help to improve the reliability of the battery cell.

[0035] According to some embodiments of the present application, the temperature reduction unit includes a phase change component or an aerosol fire extinguishing component.

[0036] In the above solution, the cooling part is provided with a phase change element or an aerosol fire extinguishing element, which is beneficial to reducing the cost of the cooling part and improving the structural stability of the cooling part.

[0037] In a second aspect, the battery device provided in the embodiments of the present application includes the battery cell provided in any of the above embodiments.

[0038] The battery device provided in the embodiment of the present application has the same technical effect as the battery cell provided in any of the above embodiments, and thus will not be described in detail here.

[0039] In a third aspect, the electrical device provided in the embodiments of the present application includes the battery device provided in the above embodiments.

[0040] The electric device provided in the embodiment of the present application has the same technical effect as the battery device provided in the above embodiment, and thus will not be described in detail here.

[0041] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a battery device provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of a battery module in a battery device provided in an embodiment of the present application; Figure 4 A schematic diagram of the explosion structure of a battery cell in a battery device provided in an embodiment of the present application; Figure 5 A front view of a part of the structure of a battery cell is provided for an embodiment of the present application; Figure 6 A schematic cross-sectional structure diagram of a first insulating member in a battery cell provided in an embodiment of the present application; Figure 7 A schematic cross-sectional structure diagram of a first insulating member in another battery cell provided in an embodiment of the present application; Figure 8 A top view of a first insulating member in a battery cell provided in an embodiment of the present application; Fig. 9 for Figure 8 Schematic diagram of the cross-sectional structure along AA; Fig.10 A top view of a first insulating member in another battery cell provided in an embodiment of the present application; Fig.11 A schematic cross-sectional view of a portion of the structure of a battery cell provided in an embodiment of the present application; Fig.12 This is a schematic diagram of the structure of part of the battery cell provided in an embodiment of the present application.

[0044] In the drawings, the figures are not necessarily drawn to scale.

[0045] Description of reference numerals: 1- Vehicle; 10-battery device; 11-box; 111-first sub-box; 112-second sub-box; 1a-motor; 1b-controller; 20-battery module; 30 - battery cell; 31 - shell; 311 - housing; 312 - end cover; 313 - first wall; 32 - electrode assembly; 321 - electrode body; 322 - pole ear; 33 - electrode terminal; 40-current collecting member; 40a-recess; 41-welding portion; 50-first insulating member; 51-first portion; 51a-groove; 52-adhesive portion; 60-a second insulating member; 61-a boss; 70-cooling part; X-first direction; Y-thickness direction. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0048] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0049] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0050] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0051] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0052] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, in parallel or in mixed connection through a busbar component.

[0053] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, a battery cell assembly may be a battery module, and a battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, a battery module may be formed by bundling a plurality of battery cells by a cable tie.

[0054] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.

[0055] 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.

[0056] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.

[0057] 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.

[0058] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0059] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0060] The battery cells may be, but are not limited to, lithium ion batteries, sodium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, etc.

[0061] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0062] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0063] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0064] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0065] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for battery cells may also be used.

[0066] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0067] As an example, the negative electrode current collector may be a metal foil or a composite current collector. For example, the metal foil may be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, copper, aluminum, carbon electrode, carbon, nickel or titanium.

[0068] In some embodiments, the negative electrode current collector has two surfaces opposite to each other in its thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0069] 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.

[0070] In some embodiments, the diaphragm is an isolation membrane. The present application has no particular limitation on the type of isolation membrane, and any known isolation membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0071] 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.

[0072] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0073] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0074] In some embodiments, the electrode assembly is a laminate structure.

[0075] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0076] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap closes the opening to form a closed space for accommodating substances such as the electrode assembly and the electrolyte. The shell may be provided with one or more openings. One or more end caps may also be provided.

[0077] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab of the electrode assembly. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collector. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.

[0078] In some embodiments, an explosion-proof valve is provided on the housing, and the explosion-proof valve is used to release the internal pressure of the battery cell.

[0079] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal prismatic battery, such as a hexagonal prismatic battery, etc. There is no particular limitation in the embodiments of the present application.

[0080] During the manufacturing process of battery cells, the current collector electrically connects the electrode terminal and the tab. The connection between the current collector and the electrode terminal is usually welded, and the current collector and the electrode terminal are usually welded on the side of the current collector facing away from the electrode terminal. A portion of the welding slag generated during the welding process between the current collector and the electrode terminal will remain on the side of the current collector facing the electrode assembly. In order to reduce the risk of welding slag falling into the interior of the electrode assembly and damaging the electrode assembly, a glue layer is usually applied to the side of the welding portion between the current collector and the electrode terminal facing the electrode assembly after welding is completed to cover the welding slag.

[0081] However, the problem of electrode assembly damage still exists in related products. To this end, the inventors conducted in-depth research and a series of experiments. The results showed that in the process of coating the adhesive layer on the side of the current collector facing the electrode assembly, the thickness of the adhesive layer may not be well controlled, and the adhesive layer after solidification usually has a convex peak. During the use of the battery cell, the convex peak moves toward the electrode assembly as the shell of the battery cell deforms. The convex peak has the risk of crushing the electrode assembly, and then causing the risk of internal short circuit in the battery cell, which seriously affects the reliability of the battery cell.

[0082] In view of this, the battery cell provided in the embodiment of the present application includes a shell, an electrode terminal, an electrode assembly, a current collector and a first insulating member. The shell has a first wall, and the electrode terminal is arranged on the first wall. The electrode assembly is accommodated in the shell, and the electrode assembly includes an electrode body and a pole ear, and the pole ear is led out from the end of the electrode body along the thickness direction Y of the first wall. The current collector is arranged in the shell, and the current collector electrically connects the pole ear and the electrode terminal. The current collector has a welding portion, and the welding portion is welded to the electrode terminal. The first insulating member is arranged on the side of the welding portion facing away from the electrode terminal, and the first insulating member includes a first part, and the first part is arranged on the side of the first insulating member facing the electrode body, and the Young's modulus E of the first part satisfies: 0.5MPa≤E≤3MPa.

[0083] The electric cell provided in the embodiment of the present application has the Young's modulus E of the first part set to satisfy: 0.5MPa≤E≤3MPa. When the outer shell is deformed, the first insulating part is displaced accordingly. When the first wall of the first insulating part contacts and squeezes the electrode assembly, the first part can produce a larger deformation. The squeezing force of the first insulating part on the electrode assembly can be reduced through the deformation of the first part. In this way, while improving the structural stability of the first insulating part, it is also beneficial to reduce the risk of the first insulating part damaging the electrode assembly, thereby reducing the risk of internal short circuit of the battery cell, which is beneficial to improving the reliability of the battery cell.

[0084] The technical solutions described in the embodiments of the present application are applicable to battery cells, battery devices including battery cells, and electrical devices using the battery devices.

[0085] The battery device disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships, or aircraft. The battery device disclosed in the present application can be used to form a power supply system of the electrical device.

[0086] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0087] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0088] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1 provided in an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 10 is provided inside the vehicle 1, and the battery device 10 may be provided at the bottom, head or tail of the vehicle 1. The battery device 10 may be used to power the vehicle 1, for example, the battery device 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1.

[0089] The vehicle 1 may further include a controller 1b and a motor 1a, wherein the controller 1b is used to control the battery device 10 to supply power to the motor 1a, for example, to meet the power requirements of starting, navigating, and driving the vehicle 1.

[0090] In some embodiments of the present application, the battery device 10 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0091] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the structure of the battery device 10 provided in an embodiment of the present application. Figure 3 Schematic diagram of the structure of the battery module 20 in the battery device 10 provided in an embodiment of the present application. The battery device 10 includes a box 11 and a battery cell 30, and the battery cell 30 is accommodated in the box 11. Among them, the box 11 is used to provide a storage space for the battery cell 30, and the box 11 can adopt a variety of structures. In some embodiments, the box 11 may include a first sub-box 111 and a second sub-box 112, the first sub-box 111 and the second sub-box 112 cover each other, and the first sub-box 111 and the second sub-box 112 jointly define a storage space for accommodating the battery cell 30. The second sub-box 112 may be a hollow structure with one end open, and the first sub-box 111 may be a plate-like structure, and the first sub-box 111 covers the open side of the second sub-box 112, so that the first sub-box 111 and the second sub-box 112 jointly define a storage space; the first sub-box 111 and the second sub-box 112 may also be hollow structures both with one side open, and the open side of the first sub-box 111 covers the open side of the second sub-box 112.

[0092] In the battery device 10, there may be multiple battery cells 30, and the multiple battery cells 30 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 30 are both connected in series and in parallel. The multiple battery cells 30 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 30 is accommodated in the box 11; of course, the battery device 10 may also be a battery module 20 in the form of multiple battery cells 30 connected in series, in parallel, or in a mixed connection, and then the multiple battery modules 20 are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 11. The battery device 10 may also include other structures, for example, the battery device 10 may also include a busbar component for realizing electrical connection between the multiple battery cells 30.

[0093] The battery cell 30 may be a secondary battery or a primary battery; the battery cell 30 may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.

[0094] Please refer to Figure 4 , Figure 4 Schematic diagram of the exploded structure of the battery cell 30 in the battery device 10 provided in the embodiment of the present application. Figure 4 As shown, the battery cell 30 includes a housing 31, an electrode assembly 32 and an electrode terminal 33. The housing 31 includes a shell 311 and an end cap 312. The shell 311 has an opening, and the end cap 312 closes the opening to isolate the internal environment of the battery cell 30 from the external environment.

[0095] The shell 311 is a component used to cooperate with the end cap 312 to form the internal environment of the battery cell 30, wherein the formed internal environment can be used to accommodate the electrode assembly 32, the electrolyte and other components. The shell 311 and the end cap 312 can be independent components. The shell 311 can be of various shapes and sizes. Specifically, the shape of the shell 311 can be determined according to the specific shape and size of the electrode assembly 32. The material of the shell 311 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0096] The end cap 312 refers to a component that covers the opening of the shell 311 to isolate the internal environment of the battery cell 30 from the external environment. Without limitation, the shape of the end cap 312 can be adapted to the shape of the shell 311 to match the shell 311. Optionally, the end cap 312 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 312 is not easily deformed when squeezed and collided, so that the battery cell 30 can have a higher structural strength and reliability can also be improved. Functional components such as electrode terminals 33 can be provided on the end cap 312. The electrode terminal 33 can be used to electrically connect to the electrode assembly 32 for outputting or inputting electrical energy of the battery cell 30. The material of the end cap 312 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this. In some embodiments, an insulating structure may be provided inside the end cap 312, and the insulating structure may be used to isolate the electrical connection components in the housing 311 from the end cap 312 to reduce the risk of short circuit. For example, the insulating structure may be plastic, rubber, or the like.

[0097] The electrode assembly 32 is a component in the battery cell 30 where an electrochemical reaction occurs. One or more electrode assemblies 32 may be included in the housing 311. The electrode assembly 32 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet, and the separator is used to separate the positive electrode sheet and the negative electrode sheet to avoid short circuits between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the electrode body 321 of the electrode assembly 32, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the tabs 322. The positive tab and the negative tab may be located together at one end of the electrode body 321 or at both ends of the electrode body 321, respectively. During the charge and discharge process of the battery cell 30, the positive active material and the negative active material react with the electrolyte, and the tabs 322 are connected to the electrode terminals 33 to form a current loop.

[0098] First, as Figure 4 and Figure 5As shown, the battery cell 30 provided in the embodiment of the present application includes a shell 31, an electrode terminal 33, an electrode assembly 32, a current collector 40 and a first insulating member 50. The shell 31 has a first wall 313, and the electrode terminal 33 is arranged on the first wall 313. The electrode assembly 32 is accommodated in the shell 31, and the electrode assembly 32 includes an electrode body 321 and a pole ear 322, and the pole ear 322 is led out from the end of the electrode body 321 along the thickness direction Y of the first wall 313. The current collector 40 is arranged in the shell 31, and the current collector 40 electrically connects the pole ear 322 and the electrode terminal 33. The current collector 40 has a welding portion 41, and the welding portion 41 is welded to the electrode terminal 33. The first insulating member 50 is arranged on the side of the welding portion 41 facing away from the electrode terminal 33, and the first insulating member 50 includes a first portion 51, and the first portion 51 is arranged on the side of the first insulating member 50 facing the electrode body 321, and the Young's modulus E of the first portion 51 satisfies: 0.5MPa≤E≤3MPa.

[0099] The shell 31 has a first wall 313. Optionally, the first wall 313 may be a part of the shell 311, or the first wall 313 may be at least a part of the end cover 312. Of course, both the shell 311 and the end cover 312 may have the first wall 313. The specific setting may be made according to actual needs.

[0100] The electrode assembly 32 includes an electrode body 321 and a pole ear 322, and the pole ear 322 is led out from the end of the electrode body 321 along the thickness direction Y of the first wall 313. Optionally, the pole ear 322 can be led out from one end of the first wall 313 along the thickness direction Y, or the pole ear 322 can be led out from both ends of the electrode body 321 along the thickness direction Y.

[0101] The current collector 40 is electrically connected to the tab 322 and the electrode terminal 33, and the current collector 40 can be electrically connected to the tab 322 and the electrode terminal 33 respectively by welding. The welding portion 41 of the current collector 40 is electrically connected to the electrode terminal 33, and the current collector 40 can be electrically connected to the tab 322 through other parts other than the welding portion 41.

[0102] The welding portion 41 is welded to the electrode terminal 33, and laser welding can be used to weld the welding portion 41 and the electrode terminal 33 on the side of the welding portion 41 of the current collector 40 that is away from the electrode terminal 33. After welding is completed, some welding slag will remain on the side of the welding portion 41 that is away from the electrode terminal 33.

[0103] The first insulating member 50 is disposed on the side of the welding portion 41 facing away from the electrode terminal 33. Optionally, the first insulating member 50 can be bonded to the side of the welding portion 41 facing away from the electrode terminal 33 by bonding, or a liquid colloid is directly coated on the side of the welding portion 41 facing away from the electrode terminal 33, and the first insulating member 50 is formed after the liquid colloid is cured.

[0104] The first insulating member 50 includes a first portion 51 . Optionally, the first insulating member 50 may include only the first portion 51 , or the first insulating member 50 may include other structures in addition to the first portion 51 .

[0105] The first portion 51 is disposed on the side of the first insulating member 50 facing the electrode body 321 . When the shell 31 is deformed, the first insulating member 50 is displaced accordingly and approaches the electrode assembly 32 . The first portion 51 of the first insulating member 50 gradually contacts and squeezes the electrode body 321 .

[0106] The Young's modulus E of the first part 51 satisfies: 0.5 MPa≤E≤3 MPa, then optionally, E can be 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1 MPa, 1.1 MPa, 1.2 MPa, 1.3 MPa, 1.4 MPa, 1.5 MPa, 1.6 MPa, 1.7 MPa, 1.8 MPa, 1.9 MPa, 2 MPa, 2.1 MPa, 2.2 MPa, 2.3 MPa, 2.4 MPa, 2.5 MPa, 2.6 MPa, 2.7 MPa, 2.8 MPa, 2.9 MPa or 3 MPa, etc.

[0107] The measurement method of the Young's modulus E of the first part 51 may refer to relevant standards. For example, the Young's modulus of the first part 51 may be measured according to the method in "ASTM D638 Standard Test Method for Tensile Properties of Plastics".

[0108] It can be understood that, to a certain extent, the smaller the Young's modulus E of the first part 51 is, the more obvious the tendency of the first part 51 to deform during the squeezing between the first part 51 and the electrode body 321 is, and the more conducive it is to reduce the damage of the first insulating member to the electrode body 321 through the deformation of the first wall 313. Since the battery cell 30 generates a certain amount of gas during operation, the gas accumulates in the shell 31, and a certain pressure is formed in the shell 31. The larger the Young's modulus of the first part 51 is to a certain extent, the more conducive it is to improve the structural stability of the first part 51, reduce the risk of the first part 51 being deformed or punctured under the action of the internal air pressure, and improve the structural stability of the first insulating member 50.

[0109] After systematic analysis and long-term practice, the inventors found that setting 0.5MPa≤E≤3MPa is beneficial to improving the structural stability of the first insulating member 50 while also helping to increase the deformation of the first part 51 when it is squeezed with the electrode body 321, thereby reducing the risk of the electrode body 321 being damaged by squeezing.

[0110] The electric cell provided in the embodiment of the present application is configured such that the Young's modulus E of the first part 51 satisfies: 0.5MPa≤E≤3MPa. When the outer shell 31 is deformed, the first insulating member 50 is displaced accordingly. When the first wall 313 of the first insulating member 50 contacts and squeezes the electrode assembly 32, the first part 51 can produce a larger deformation. The deformation of the first part 51 can reduce the squeezing force of the first insulating member 50 on the electrode assembly 32. In this way, while improving the structural stability of the first insulating member 50, it is also beneficial to reduce the risk of the first insulating member 50 damaging the electrode assembly 32, thereby reducing the risk of internal short circuit in the battery cell 30, and is beneficial to improving the reliability of the battery cell 30.

[0111] In some embodiments, 0.5 MPa≤E≤1.1 MPa.

[0112] Optionally, E may be 0.5 MPa, 0.6 MPa, 0.7 MPa, 0.8 MPa, 0.9 MPa, 1 MPa or 1.1 MPa, etc.

[0113] After further systematic analysis and long-term practice, the inventors found that setting 0.5MPa≤E≤1.1MPa is beneficial to improving the structural stability of the first insulating member 50, while also helping to further increase the deformation of the first part 51 when it is squeezed with the electrode body 321, further reducing the risk of the electrode body 321 being damaged by squeezing.

[0114] In some embodiments, Figure 5 , Figure 6 and Figure 7 As shown, the first insulating member 50 further includes a bonding portion 52 , and the bonding portion 52 connects the first portion 51 and the welding portion 41 .

[0115] In this way, the first part 51 is connected to the welding part 41 through the adhesive part 52. The first part 51 can be a finished part and is connected to the welding part 41 through the adhesive part 52. The first part 51 can be a machined part to facilitate the processing of the first part 51 and to facilitate the control of the surface morphology of the first part 51, thereby reducing the peaks and other structures on the surface of the first part 51, so as to reduce the damage to the electrode body 321 when the first part 51 and the electrode body 321 are squeezed.

[0116] The adhesive portion 52 may be formed by curing the colloid during the process of connecting the first portion 51 to the welding portion 41 , thereby facilitating the connection between the first portion 51 and the welding portion 41 .

[0117] Therefore, the first insulating part 50 is provided with an adhesive portion 52, which facilitates the connection between the first portion 51 and the welding portion 41, facilitates the processing of the first portion 51, and also facilitates the control of the surface morphology of the first portion 51, reduces the height of the peak on the first portion 51, and further reduces the risk of the peak on the first portion 51 squeezing the electrode body 321.

[0118] In some embodiments, the material of the adhesive portion 52 includes at least one of epoxy resin, vinyl acetate resin, polyurethane, acrylic acid, and polyvinyl alcohol.

[0119] Epoxy resin, vinyl acetate resin, polyurethane, acrylic acid and polyvinyl alcohol have high corrosion resistance and high structural stability after curing, which is beneficial to improve the structural stability of the first insulating member 50.

[0120] In some embodiments, Figure 6 As shown, the first portion 51 and the bonding portion 52 are stacked along the thickness direction Y.

[0121] The first part 51 and the bonding part 52 are stacked along the thickness direction Y, and the bonding part 52 is arranged between the first part 51 and the welding part 41, which is beneficial to improve the bonding stability of the bonding part 52 to the first part 51 and the welding part 41, and further beneficial to improve the structural stability of the first insulating member 50.

[0122] In some embodiments, Figure 6 As shown, along the thickness direction Y, the dimension of the first insulating member 50 is y, the dimension of the first portion 51 is x1, and 0.2≤x1 / y≤0.8.

[0123] Optionally, x1 / y can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 or 0.8, etc.

[0124] It can be understood that, to a certain extent, the larger the value of x1 / y is, the larger the deformation amount that the first part 51 can produce when the first insulating member 50 and the electrode body 321 are squeezed, which is conducive to reducing the squeezing force of the first part 51 on the electrode body 321. And the smaller the value of x1 / y is to a certain extent, the more conducive it is to increase the size of the bonding part 52 along the thickness square, which is conducive to improving the bonding stability of the welding part 41 to the first part 51 and the welding part 41.

[0125] Therefore, after systematic analysis and long-term practice, the inventors found that setting 0.2≤x1 / y≤0.8 is beneficial to improving the bonding stability between the first part 51 and the welding part 41, while also helping to increase the maximum deformation of the first part 51, thereby helping to reduce the squeezing pressure of the first part 51 on the electrode body 321.

[0126] In some embodiments, Figure 7 , Figure 8 and Fig. 9 As shown, the first portion 51 has a groove 51 a on one side facing the welding portion 41 , and the bonding portion 52 is filled in the groove 51 a .

[0127] It can be understood that the bonding portion 52 can be solidified by a fluid glue, and before the bonding portion 52 is solidified, it has a certain fluidity. By providing a groove 51a on the side of the first portion 51 facing the welding portion 41, and providing the bonding portion 52 to fill the groove 51a, it is helpful to reduce the risk of the bonding portion 52 flowing to other areas before solidification and interfering with other structures.

[0128] In some embodiments, Figure 8 , Fig. 9 and Fig.10 As shown, the groove 51a is annular.

[0129] The groove 51a is annular, and the first part 51 has an annular groove 51a. In this way, under the premise of providing bonding effect to the first part 51 and the welding part 41 through the bonding part 52, it is also beneficial to reduce the volume of the first insulating part 50 occupied by the bonding part 52, so as to increase the volume share of the first part 51 in the first insulating part 50, which is beneficial to further increase the deformation amount that the first part 51 can produce under the extrusion state, and further help to reduce the extrusion force of the first part 51 on the electrode body 321, thereby improving the reliability performance of the battery cell 30.

[0130] In some embodiments, Figure 7 , Figure 8 and Fig. 9 As shown, along the thickness direction Y, the dimension of the first insulating member 50 is y, and the dimension of the bottom wall of the groove 51a opposite to the bonding portion 52 along the thickness direction Y is x2, and 0.2≤x2 / y≤0.8.

[0131] A dimension x2 of the bottom wall of the groove 51 a opposite to the bonding portion 52 along the thickness direction Y may be the minimum dimension of the first portion 51 along the thickness direction Y.

[0132] Optionally, x2 / y can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 or 0.8, etc.

[0133] It can be understood that, to a certain extent, the larger the value of x2 / y is, the larger the deformation amount that the first part 51 can produce when the first insulating member 50 and the electrode body 321 are squeezed, which is conducive to reducing the squeezing force of the first part 51 on the electrode body 321. And the smaller the value of x2 / y is to a certain extent, the more conducive it is to increase the size of the bonding part 52 along the thickness square, which is conducive to improving the bonding stability of the welding part 41 to the first part 51 and the welding part 41.

[0134] Therefore, after systematic analysis and long-term practice, the inventors found that setting 0.2≤x2 / y≤0.8 is beneficial to improving the bonding stability between the first part 51 and the welding part 41, while also helping to increase the maximum deformation of the first part 51, thereby helping to reduce the squeezing pressure of the first part 51 on the electrode body 321.

[0135] In some embodiments, Fig.12 As shown, the current collector 40 has a recess 40 a, which is recessed toward the electrode terminal 33, the welding portion 41 is disposed on the bottom wall of the recess 40 a, and at least a portion of the first insulating member 50 is disposed in the recess 40 a.

[0136] The current collector 40 has a recess 40a, which can be formed by a stamping process. The welding portion 41 is provided on the bottom wall of the recess 40a, and the welding portion 41 is protruded toward the electrode terminal 33 relative to other parts of the current collector 40, so that in the process of welding the welding portion 41 and the electrode terminal 33, the welding portion 41 and the electrode terminal 33 are better fitted, and the welding process of the welding portion 41 and the electrode terminal 33 is smoothly carried out.

[0137] At least part of the first insulating member 50 is disposed in the recess 40a, and the recess 40a can provide a certain limiting effect on the first insulating member 50, thereby reducing the risk of the first insulating member 50 being separated from the welding portion 41. In the process of forming the bonding portion 52 or the first portion 51 by coating the fluid glue, the recess 40a can provide a certain limiting effect for the fluid glue, thereby reducing the risk of the fluid glue flowing to other parts of the current collecting member 40 and interfering with other structures.

[0138] Therefore, by setting at least a portion of the first insulating member 50 to be located in the recess 40a, the recess 40a can be used to provide a certain limiting effect for the first insulating member 50 and help reduce the risk of the first insulating member 50 moving to other locations and interfering with other structures.

[0139] In some embodiments, the material of the first portion 51 includes at least one of fluororubber, silicone rubber, and polyurethane.

[0140] Fluororubber, silicone rubber and polyurethane all have a low elastic modulus, so that when the first part 51 and the electrode body 321 are squeezed, the first part 51 can generate enough deformation to reduce the squeezing of the electrode assembly 32. In addition, fluororubber, silicone rubber and polyurethane can resist corrosion of the electrolyte, which is beneficial to improve the structural stability of the first insulating member 50.

[0141] In some embodiments, the first insulating member 50 covers a side of the welding portion 41 facing away from the electrode terminal 33 .

[0142] The first insulating member 50 covers the surface of the welding portion 41 facing away from the electrode terminal 33 , which is beneficial to improving the covering effect of the first insulating member 50 on the welding slag on the side of the welding portion 41 facing the electrode assembly 32 , and further helps to reduce the risk of the welding slag falling into the interior of the electrode assembly 32 and damaging the electrode assembly 32 .

[0143] In some embodiments, along the thickness direction Y, the area of ​​the orthographic projection of the first portion 51 on the first wall 313 is S1, the area of ​​the orthographic projection of the welding portion 41 on the first wall 313 is S2, and S1 / S2≥1.2.

[0144] Optionally, S1 / S2 can be 1.2, 1.3, 1.4 or 1.5, etc.

[0145] It is understandable that after the welding of the welding part 41 and the electrode terminal 33 is completed, the welding slag may splash into a certain area around the welding part 41. By setting S1 / S2≥1.2, the welding part 41 and the adjacent area therearound can be covered by the first insulating member 50 to further reduce the risk of the welding slag entering the interior of the electrode assembly 32 and damaging the electrode assembly 32.

[0146] In some embodiments, Figure 5 As shown, the battery cell 30 also includes a second insulating member 60, which is arranged on the side of the first wall 313 facing the electrode assembly 32, and the current collector 40 is arranged on the side of the second insulating member 60 facing away from the first wall 313. The second insulating member 60 has a boss 61 protruding toward the electrode body 321, and the boss 61 is located on one side of the first insulating member 50 along the first direction X, and the first direction X intersects with the thickness direction Y; along the first direction X, the orthographic projection of the first insulating member 50 is located within the boss 61.

[0147] The second insulating member 60 is disposed on the side of the first wall 313 facing the electrode assembly 32, and the second insulating member 60 can provide a certain insulation effect for the first wall 313 and the electrode assembly 32, and the first wall 313 and the current collector 40. The second insulating member 60 has a boss 61 protruding toward the electrode body 321, and the boss 61 can be abutted against the electrode body 321, so as to provide a certain limiting effect on the electrode body 321 through the boss 61, thereby reducing the risk of the electrode assembly 32 shaking inside the housing 31.

[0148] The boss 61 is located at one side of the first insulating member 50 along the first direction X. Optionally, the boss 61 may be located at both ends of the first insulating member 50 along the first direction X, and the boss 61 is spaced apart from the first insulating member 50 along the first direction X.

[0149] Along the first direction X, the orthographic projection of the first insulating member 50 is located inside the boss 61, and along the first direction X, the edge of the orthographic projection of the first insulating member 50 may be flush with the boss 61, or the edge of the orthographic projection of the first insulating member 50 may be displaced inside the boss 61. In other words, the first insulating member 50 does not extend beyond the boss 61 along the thickness direction Y, and the orthographic projection of the surface of the first insulating member 50 facing the electrode assembly 32 along the first direction X is located inside the boss 61.

[0150] In this way, the boss 61 can provide a certain stopping effect on the relative movement between the electrode assembly 32 and the first insulating member 50, which is beneficial to further reduce the risk of the first part 51 contacting the electrode assembly 32 and crushing the electrode assembly 32, and further beneficial to improve the structural stability of the electrode assembly 32.

[0151] In some embodiments, Fig.11 As shown, the battery cell 30 further includes a cooling unit 70 , which is used to cool the interior of the battery cell 30 . The cooling unit 70 is disposed on a side of the first insulating member 50 facing away from the current collecting member 40 .

[0152] The cooling unit 70 may be any structure that can play a certain cooling role, so as to absorb the heat inside the battery cell 30 and cool down the inside of the battery cell 30 when the heat inside the battery cell 30 increases.

[0153] The cooling part 70 is arranged on the side of the first insulating member 50 facing away from the current collecting member 40, and the cooling member is arranged on the surface of the first insulating member 50 facing the electrode assembly 32. When the internal temperature of the battery cell 30 rises, it is convenient for the cooling member to exchange heat with the inside of the battery cell 30.

[0154] Therefore, by providing the cooling unit 70 , it is helpful to cool the inside of the battery cell 30 , reduce the risk of thermal runaway of the battery cell 30 , and further help to improve the reliability of the battery cell 30 .

[0155] In some embodiments, the temperature reduction unit 70 includes a phase change element or an aerosol fire extinguishing element.

[0156] The phase change element can absorb heat during the process of changing its state. For example, the phase change element can be paraffin or the like.

[0157] The aerosol fire extinguishing element can absorb heat during the chemical reaction to reduce the temperature inside the battery cell 30 .

[0158] Providing the cooling unit 70 with a phase change component or an aerosol fire extinguishing component is beneficial to reducing the cost of the cooling unit 70 and improving the structural stability of the cooling unit 70 .

[0159] In a second aspect, the battery device 10 provided in the embodiment of the present application includes the battery cell 30 provided in any of the above embodiments.

[0160] The battery device 10 provided in the embodiment of the present application has the same technical effect as the battery cell 30 provided in any of the above embodiments, and thus will not be described in detail here.

[0161] In a third aspect, the electrical device provided in the embodiments of the present application includes the battery cell 30 or the battery device 10 provided in any of the above embodiments, and the battery device 10 is used to provide electrical energy.

[0162] The electric device provided in the embodiment of the present application has the same technical effect as the battery device 10 provided in any of the above embodiments, and thus will not be described in detail here.

[0163] In some embodiments, Figures 4 to 12As shown, the battery cell 30 includes a housing 31, an electrode terminal 33, an electrode assembly 32, a recording member, a first insulating member 50, and a second insulating member 60. The housing 31 has a first wall 313, the electrode terminal 33 is disposed on the first wall 313, the electrode assembly 32 is accommodated in the housing 31, and the electrode assembly 32 includes an electrode body 321 and a tab 322, the tab 322 is led out from the end of the electrode body 321 along the thickness direction Y of the first wall 313. The current collector 40 is disposed in the housing 31, the current collector 40 electrically connects the tab 322 and the electrode terminal 33, and the current collector 40 has a welding portion 41, and the welding portion 41 is welded to the electrode terminal 33. The first insulating member 50 is disposed on the side of the welding portion 41 facing away from the electrode terminal 33. The first insulating member 50 includes a first portion 51 and an adhesive portion 52. The adhesive portion 52 is adhesively connected to the first portion 51 and the welding portion 41. The first portion 51 is disposed on the side of the first insulating member 50 facing the electrode body 321. The Young's modulus E of the first portion 51 satisfies: 0.5MPa≤E≤3MPa. The material of the adhesive portion 52 includes at least one of epoxy resin, vinyl acetate resin, polyurethane, acrylic acid and polyvinyl alcohol. The material of the first portion 51 includes at least one of fluororubber, silicone rubber and polyurethane. The first portion 51 has a groove 51a on the side facing the welding portion 41. The adhesive portion 52 is filled in the groove 51a, and the groove 51a is annular. Along the thickness direction Y, the size of the first insulating member 50 is y, and the size of the bottom wall of the groove 51a opposite to the adhesive portion 52 along the thickness direction Y is x2, 0.2≤x2 / y≤0.8. The current collector 40 has a recessed portion 40a, which is recessed toward the electrode terminal 33. The welding portion 41 is disposed on the bottom wall of the recessed portion 40a, and at least part of the first insulating member 50 is disposed in the recessed portion 40a. The first insulating member 50 covers the side of the welding portion 41 facing away from the electrode terminal 33. Along the thickness direction Y, the area of ​​the orthographic projection of the first portion 51 on the first wall 313 is S1, and the area of ​​the orthographic projection of the welding portion 41 on the first wall 313 is S2, and S1 / S2≥1.2. The second insulating member 60 is disposed on the side of the first wall 313 facing the electrode assembly 32, and the current collector 40 is disposed on the side of the second insulating member 60 facing away from the first wall 313. The second insulating member 60 has a boss 61 protruding toward the electrode body 321, and the boss 61 is located on one side of the first insulating member 50 along the first direction X, and the first direction X intersects with the thickness direction Y. Along the first direction X, the orthographic projection of the first insulating member 50 is located in the boss 61.

[0164] The electric cell provided in the embodiment of the present application is configured such that the Young's modulus E of the first part 51 satisfies: 0.5MPa≤E≤3MPa. When the outer shell 31 is deformed, the first insulating member 50 is displaced accordingly. When the first wall 313 of the first insulating member 50 contacts and squeezes the electrode assembly 32, the first part 51 can produce a larger deformation. The deformation of the first part 51 can reduce the squeezing force of the first insulating member 50 on the electrode assembly 32. In this way, while improving the structural stability of the first insulating member 50, it is also beneficial to reduce the risk of the first insulating member 50 damaging the electrode assembly 32, thereby reducing the risk of internal short circuit in the battery cell 30, and is beneficial to improving the reliability of the battery cell 30.

[0165] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having a first wall; an electrode terminal, disposed on the first wall; An electrode assembly, contained in the housing, comprising an electrode body and a tab, wherein the tab is led out from an end of the electrode body in a thickness direction of the first wall; A current collector is disposed in the housing, the current collector electrically connects the electrode tab and the electrode terminal, and the current collector has a welding portion, and the welding portion is welded to the electrode terminal; The first insulating member is arranged on the side of the welding portion facing away from the electrode terminal. The first insulating member includes a first portion. The first portion is arranged on the side of the first insulating member facing the electrode body. The Young's modulus E of the first portion satisfies: 0.5MPa≤E≤3MPa.

2. The battery cell according to claim 1, characterized in that: 0.5MPa≤E≤1.1MPa.

3. The battery cell according to claim 1, characterized in that: The first insulating member further includes an adhesive portion connecting the first portion and the welding portion.

4. The battery cell according to claim 3, characterized in that: The material of the bonding portion includes at least one of epoxy resin, vinyl acetate resin, polyurethane, acrylic acid and polyvinyl alcohol.

5. The battery cell according to claim 3, characterized in that: The first portion and the bonding portion are stacked along the thickness direction.

6. The battery cell according to claim 5, characterized in that: Along the thickness direction, the size of the first insulating member is y, the size of the first portion is x1, and 0.2≤x1 / y≤0.

8.

7. The battery cell according to claim 3, characterized in that: A side of the first portion facing the welding portion has a groove, and the bonding portion is filled in the groove.

8. The battery cell according to claim 7, characterized in that: The groove is annular.

9. The battery cell according to claim 8, characterized in that: Along the thickness direction, the size of the first insulating member is y, and the size of the bottom wall of the groove opposite to the bonding portion along the thickness direction is x2, and 0.2≤x2 / y≤0.

8.

10. The battery cell according to claim 1, characterized in that: The current collecting member has a recessed portion, the recessed portion is recessed toward the electrode terminal, the welding portion is disposed on a bottom wall of the recessed portion, and at least a portion of the first insulating member is disposed in the recessed portion.

11. The battery cell according to claim 1, characterized in that: The material of the first part includes at least one of fluororubber, silicone rubber and polyurethane.

12. The battery cell according to any one of claims 1 to 11, characterized in that: The first insulating member covers a side of the welding portion facing away from the electrode terminal.

13. The battery cell according to claim 12, characterized in that: Along the thickness direction, an area of ​​an orthographic projection of the first portion on the first wall is S1, an area of ​​an orthographic projection of the welding portion on the first wall is S2, and S1 / S2≥1.

2.

14. The battery cell according to any one of claims 1 to 11, characterized in that: The battery cell further includes a second insulating member, the second insulating member is disposed on a side of the first wall facing the electrode assembly, the current collector is disposed on a side of the second insulating member facing away from the first wall, the second insulating member has a boss protruding toward the electrode body, the boss is located on a side of the first insulating member along a first direction, and the first direction intersects the thickness direction; Along the first direction, the orthographic projection of the first insulating member is located within the boss.

15. The battery cell according to any one of claims 1 to 11, characterized in that: The battery cell further includes a cooling unit, which is used to cool the interior of the battery cell. The cooling unit is disposed on a side of the first insulating member that is away from the current collecting member.

16. The battery cell according to claim 15, characterized in that: The temperature-reducing part includes a phase-changing component or an aerosol fire-extinguishing component.

17. A battery device, characterized in that: Comprising the battery cell according to any one of claims 1 to 16.

18. An electrical device, characterized in that: Comprising the battery device as claimed in claim 17, the battery device is used to provide electrical energy.

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