Battery monomer, battery device and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery device and electric equipment, the battery monomer comprises a shell, the shell comprises a shell with a metal layer and a cover plate, the shell is of a hollow structure with a first opening, the cover plate covers the first opening, and the shell is connected with the cover plate; the electrode assembly is accommodated in the hollow structure; the shell further comprises a reinforcing structure, the reinforcing structure is connected with the shell body and / or the cover plate in a stacked mode, and the tensile strength of the reinforcing structure is larger than or equal to the tensile strength of the shell body and the tensile strength of the cover plate. According to the battery monomer, the battery device and the power utilization device provided by the embodiment of the invention, the strength of the shell of the battery monomer can be enhanced, and the safety performance of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, and more particularly, to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] For electric vehicles and large-scale energy storage systems, the energy density of the battery device is a key performance indicator. With the pursuit of higher energy density, the design and manufacture of the battery device face a series of challenges, one of which is the safety problem.

[0003] Aluminum shell is widely used as the shell material of the battery monomer due to its light weight, good thermal conductivity and easy processing characteristics. However, when the battery is under abuse conditions, such as overcharging, or mechanical impact, etc., a violent chemical reaction may occur inside the battery cell, resulting in a large amount of heat and gas, and the pressure inside the battery rapidly increases, which will cause a great pressure load on the aluminum shell. In extreme cases, this pressure may exceed the bearing limit of the aluminum shell, resulting in shell rupture, thus failing to achieve directional pressure relief. Therefore, how to enhance the strength of the shell of the battery monomer has become a problem to be solved. UTILITY MODEL CONTENT

[0004] The embodiments of the present application provide a battery monomer, a battery device and an electric equipment, which can enhance the strength of the shell of the battery monomer and improve the safety performance of the battery device.

[0005] In a first aspect, a battery monomer is provided, comprising a shell, the shell comprising a shell body having a metal layer and a cover plate, the shell body being a hollow structure having a first opening, the cover plate being arranged on the first opening, the shell body being connected with the cover plate; an electrode assembly, the electrode assembly being accommodated in the hollow structure; wherein the shell further comprises a reinforcing structure, the reinforcing structure being connected with the shell body and / or the cover plate in a laminated manner, the tensile strength of the reinforcing structure being greater than or equal to the tensile strength of the shell body and the cover plate.

[0006] The embodiments of the present application can improve the tensile strength of the shell by connecting the reinforcing structure on the surface of the metal layer of the shell body and / or the metal layer of the cover plate, so that the anti-deformation ability of the shell is enhanced, and the stability of the shell is improved. By enhancing the performance of the shell of the battery monomer, the electrochemical system inside the battery can be protected, and the leakage of active substances can be avoided, thereby significantly improving the safety performance of the battery device. In addition, the enhanced shell can also reduce the damage caused by mechanical impact or vibration during transportation and use of the battery, prolong the service life of the battery, and improve its reliability and durability.

[0007] In some embodiments, the reinforcing structure is arranged on the side of the cover plate or the shell body away from the electrode assembly.

[0008] The reinforcing structure is arranged outside the shell or the cover plate, the internal space of the battery monomer is reduced, and the reinforcing structure is easy to process and realize.

[0009] In some embodiments, a welding seam is formed at the connection between the shell and the cover plate, and the reinforcing structure is a structure continuously covering the welding seam.

[0010] In some embodiments, the reinforcing structure is an integrated structure continuously covering the welding seam, the strength of the welding seam area of the shell is enhanced, and the possibility of cracking of the shell in the welding seam area is reduced.

[0011] In some embodiments, the reinforcing structure covers all the welding seams.

[0012] In some embodiments, the reinforcing structure has a second opening, the reinforcing structure includes a first wall opposite the second opening and at least one second wall, the first wall and the second wall enclose a containing cavity, the first wall is arranged in a stack with the cover plate, the second wall is arranged in a stack with the shell, and the welding seam is accommodated in the containing cavity.

[0013] In some embodiments, the reinforcing structure is an integrated structure continuously covering the welding seam, the strength of the welding seam area of the shell is enhanced, and the possibility of cracking of the shell in the welding seam area is reduced.

[0014] In some embodiments, the cover plate is provided with an electrode terminal and / or a pressure relief mechanism, the first wall is provided with a through hole, and the through hole is arranged opposite the electrode terminal or the pressure relief mechanism arranged on the cover plate.

[0015] In some embodiments, the reinforcing structure includes a first part and a second part, the first part and the second part are respectively sleeved on the shell, the first part and the second part are connected to form a containing cavity, and the welding seam is accommodated in the containing cavity.

[0016] In some embodiments, the reinforcing structure is an integrated structure continuously covering the welding seam, the strength of the welding seam area of the shell is enhanced, and the possibility of cracking of the shell in the welding seam area is reduced.

[0017] In some embodiments, one side of the first part or the second part facing the cover plate is provided with a through hole, and the through hole is arranged opposite the electrode terminal or the pressure relief mechanism arranged on the cover plate.

[0018] In some embodiments, the first part and the second part each include a top wall and a side wall, the top walls of the first part and the second part are arranged opposite each other, the side walls of the first part and the second part are connected, and the top wall of the first part or the second part is arranged in a stack with the cover plate.

[0019] The first part and the second part of the reinforcing structure are completely staggered with the gap and the weld, so that the strength of the area of the shell weld is further enhanced, and the possibility of cracking of the shell in the area of the weld is reduced.

[0020] In some embodiments, the material of the reinforcing structure is carbon fiber resin composite material.

[0021] In some embodiments, the thickness of the reinforcing structure ranges from 0.1mm to 0.5mm.

[0022] In some embodiments, the tensile strength of the reinforcing structure ranges from 200MPa to 2500MPa.

[0023] The thickness and tensile strength of the reinforcing structure are set to meet the sufficient strength performance while minimizing the occupation of the internal space of the battery device, so as to optimize the energy density of the battery device.

[0024] In some embodiments, the shell further comprises a thermal insulation layer, the thermal insulation layer is connected with the reinforcing structure, the cover plate or the shell in a laminated manner, and the thermal insulation layer is located on the side of the reinforcing structure facing the electrode assembly.

[0025] The high temperature resistance of the shell is effectively improved by setting the thermal insulation layer and the position of the thermal insulation layer, and the overall strength of the shell is enhanced.

[0026] In some embodiments, the thermal insulation layer is located between the reinforcing structure and the shell.

[0027] The thermal insulation layer and the reinforcing structure are located on the outer side of the shell or the cover plate, which reduces the occupation of the internal space of the battery monomer and is easier to process.

[0028] In some embodiments, the thermal insulation layer is located on the side of the cover plate or the shell facing the electrode assembly.

[0029] In some embodiments, the thermal insulation layer is arranged on the shell, and the thermal insulation layer is arranged in a spaced manner with the cover plate.

[0030] In the embodiment of the application, the space between the thermal insulation layer and the cover plate is reserved, so that the shell and the cover plate can be easily sealed by welding when the shell is sealed, and the processing difficulty is reduced.

[0031] In some embodiments, the material of the thermal insulation layer is at least one of the following materials: aerogel material, ceramic material, asbestos, rock wool or mica material.

[0032] In some embodiments, the thickness of the thermal insulation layer ranges from [0.1mm, 0.5mm].

[0033] In a second aspect, a battery device is provided, comprising: a plurality of battery cells, the battery cell being the battery cell as claimed in the first aspect and any one of the embodiments of the first aspect.

[0034] In a third aspect, a power consuming device is provided, comprising a battery device, the battery device comprising the battery cell as claimed in the first aspect and any one of the embodiments of the first aspect, the battery device being configured to supply power to the power consuming device. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 A structural schematic diagram of a vehicle is shown according to an embodiment of the present application;

[0036] Figure 2 A structural schematic diagram of a battery device is shown according to an embodiment of the present application;

[0037] Figure 3 A structural schematic diagram of a battery cell is shown according to an embodiment of the present application;

[0038] Figure 4 A structural schematic diagram of a housing is shown according to an embodiment of the present application;

[0039] Figure 5 A structural schematic diagram of a housing is shown according to an embodiment of the present application;

[0040] Figure 6 A structural schematic diagram of a battery cell is shown according to an embodiment of the present application;

[0041] Figure 7 A structural schematic diagram of a housing is shown according to an embodiment of the present application;

[0042] Figure 8 A structural schematic diagram of a battery cell is shown according to an embodiment of the present application;

[0043] Figure 9 A structural schematic diagram of a battery cell is shown according to an embodiment of the present application;

[0044] Figure 10 A structural schematic diagram of a battery cell is shown according to an embodiment of the present application;

[0045] Figure 11 A structural schematic diagram of a housing is shown according to an embodiment of the present application;

[0046] Figure 12 A structural schematic diagram of a housing is shown according to an embodiment of the present application;

[0047] Figure 13A structural diagram of a housing of one embodiment of the present application is shown.

[0048] Figure 14 A structural diagram of a housing of one embodiment of the present application is shown.

[0049] Figure 15 A temperature change diagram of a thermal insulation layer of one embodiment of the present application is shown.

[0050] Reference Signs:

[0051] 1 - vehicle; 10 - battery device; 20 - battery cell; 30 - controller; 40 - motor; 11 - box; 111 - first box portion; 112 - second box portion; 1000 - housing; 100 - case; 200 - cover plate; 50 - pressure relief mechanism; 60 - electrode assembly; 70 - electrode terminal; 1011 - weld; 300 - reinforcing structure; 400 - thermal insulation layer; 301 - first wall; 302 - second wall; 303 - first portion; 304 - second portion. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be described below with reference to the drawings.

[0053] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationships.

[0055] Reference to an “embodiment” in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that that the embodiments described in this application can be combined with each other in their various permutations and combinations.

[0056] In the description of the application, it should be noted that, unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting”, “attachment” should be understood broadly, for example, can be fixedly connected, or detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0057] The term “and / or” in this application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character “ / ” in this application generally represents that the front and rear associated objects have an “or” relationship.

[0058] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, the detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0059] “Multiple” appearing in this application means more than two (including two), and similarly, “multiple groups” means more than two groups (including two groups), and “multiple pieces” means more than two pieces (including two pieces).

[0060] In the embodiments of the application, the battery cell can be a secondary battery device, which refers to a battery cell that can be activated by charging after discharging to continue to use.

[0061] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the application are not limited in this regard.

[0062] In some implementations, the battery cell in embodiments of the present application can be a metal battery, specifically, the metal battery can include a lithium metal secondary battery, a sodium metal battery, or a magnesium metal battery, etc., and embodiments of the present application are not limited thereto.

[0063] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery cell, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0064] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0065] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction of itself, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0066] As an example, the positive electrode current collector can be a metal foil, a foam metal, or a composite current collector. For example, as a metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or a foam carbon, etc. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0067] As an example, the positive electrode active material can 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 devices can also be used. These positive electrode active materials can be used alone or in combination with two or more. Among them, examples of lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP for short)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon.

[0068] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0069] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is provided on either one or both of the two surfaces of the negative current collector.

[0070] As an example, the negative current collector can employ a metal foil, a foamed metal, or a composite current collector. For example, as the metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, or the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, or the like. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0071] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0072] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any publicly known porous structure separator film having good chemical stability and mechanical stability can be used.

[0073] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic.

[0074] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0075] In some embodiments, the battery cell further includes an electrolyte, which functions to conduct ions between the positive electrode and the negative electrode. The type of the electrolyte is not particularly limited in the present application, and can be selected as needed. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0076] In some embodiments, the electrode assembly is provided with a tab, which can lead current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0077] The battery device according to the embodiments of the present application can include one or more battery cells to provide a single physical module having a higher voltage and capacity. When a plurality of battery cells are included, the plurality of battery cells are connected in series, in parallel, or in a mixed connection, which is a mixture of series and parallel connections.

[0078] In some embodiments, the battery device can be a battery pack, which includes a box and battery cells, the battery cells or battery modules being accommodated in the box. For example, a plurality of battery cells can be connected in series or in parallel or in a mixed manner to form a battery module, and a plurality of battery modules can be connected in series or in parallel or in a mixed manner to form the battery device. That is, a plurality of battery cells can be directly connected to form the battery device, or a plurality of battery cells can be connected to form a battery module, and the battery module can be connected to form the battery device.

[0079] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0080] In some embodiments, the battery device can be located in an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0081] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells and battery devices.

[0082] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, and an electric planer, etc. The embodiments of the present application do not specially limit the above electric devices.

[0083] Power batteries are increasingly widely used. The power batteries are not only applied to energy storage power supply systems such as hydroelectric, thermal, wind, and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, and electric transportation tools, as well as military equipment, aerospace, and other fields. With the continuous expansion of the application field of power batteries, the performance of the batteries is also increasingly strong, and higher requirements are put forward for the stability and durability of the power batteries. At present, the traditional power battery, due to the relatively intense heat and gas production reaction inside the battery cell, the tensile strength and durability of the battery shell itself need to be improved.

[0084] The battery monomer provided by the embodiment of the present application, the battery device and the electric equipment, the battery monomer comprises a shell, the shell comprises a shell body with a metal layer and a cover plate, the shell body is a hollow structure with a first opening, the cover plate is arranged on the first opening, and the shell body is connected with the cover plate; an electrode assembly is accommodated in the hollow structure; wherein the shell further comprises a reinforcing structure, the reinforcing structure is laminatedly connected with the shell body and / or the cover plate, and the tensile strength of the reinforcing structure is greater than or equal to the tensile strength of the shell body and the cover plate.

[0085] By connecting the reinforcing structure on the surface of the metal layer of the shell body and / or the metal layer of the cover plate, the tensile strength of the shell can be improved, the deformation resistance of the shell is enhanced, and the stability of the shell is improved. By enhancing the performance of the shell of the battery monomer, the electrochemical system inside the battery can be protected, the leakage of active substances can be avoided, and the safety performance of the battery device can be significantly improved. In addition, the reinforced shell can also reduce the damage caused by mechanical impact or vibration during transportation and use of the battery, prolong the service life of the battery, and improve the reliability and durability of the battery.

[0086] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0087] Figure 1 A structural schematic diagram of a vehicle 1 is shown in the embodiment of the present application, as shown in the figure, Figure 1 The vehicle 1 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid automobile or a range extended automobile. The vehicle 1 can be provided with a motor 40, a controller 30 and a battery device 10 inside, the controller 30 is used to control the power supply of the motor 40 by the battery device 10. For example, the battery device 10 can be arranged at the bottom, the front or the tail of the vehicle 1. The battery device 10 can be used for power supply of the vehicle 1, for example, the battery device 10 can be used as the operating power source of the vehicle 1, which is used for the circuit system of the vehicle 1, for example, for the working power demand of the vehicle 1 during starting, navigation and running. In another embodiment of the present application, the battery device 10 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, which can replace or partially replace the fuel or natural gas to provide driving power for the vehicle 1.

[0088] Figure 2 A structural schematic diagram of the battery device 10 is shown in the embodiment of the present application, as shown in the figure, Figure 2 The battery device 10 in the embodiment of the present application can comprise a plurality of battery monomers 20 to meet different power requirements. The shape of the battery monomer 20 in the embodiment of the present application can be set according to actual application. For example, the battery monomer 20 can be a cuboid as shown in the figure, Figure 2 or can also be different from Figure 2The cylindrical shape or other shapes shown are not limited in the embodiments of the present application.

[0089] It should be understood that, as Figure 2 shown, the battery device 10 of the embodiments of the present application can also include a box 11, which can be used to accommodate a plurality of battery monomers 20. The box 11 of the embodiments of the present application is a hollow structure inside, and a plurality of battery monomers 20 are accommodated in the box 11. The box 11 can include two parts, here referred to as the first box part 111 and the second box part 112, which are buckled together. The shape of the first box part 111 and the second box part 112 can be determined according to the shape of the components accommodated inside, for example, according to the shape of the combination of a plurality of battery monomers 20 accommodated inside, at least one of the first box part 111 and the second box part 112 has a first opening. For example, as Figure 2 shown, the first box part 111 and the second box part 112 can both be hollow cuboids and each have a face as a first opening face, the first opening of the first box part 111 and the first opening of the second box part 112 are oppositely arranged, and the first box part 111 and the second box part 112 are buckled to each other to form a box 11 with a closed cavity, which can be used to accommodate a plurality of battery monomers 20. A plurality of battery monomers 20 are placed in the box 11 formed after the buckling of the first box part 111 and the second box part 112 after being combined in parallel or in series or in a hybrid combination.

[0090] For another example, unlike Figure 2 shown, only one of the first box part 111 and the second box part 112 can be a hollow cuboid with a first opening, and the other can be a plate to cover the first opening. Taking the second box part 112 as a hollow cuboid with a first opening and the first box part 111 as a plate as an example, the first box part 111 covers the first opening of the second box part 112 to form a box 11 with a closed cavity, which can be used to accommodate a plurality of battery monomers 20.

[0091] In some embodiments, the battery device 10 can also include other components. For example, the battery device 10 can also include a current collecting component (not shown in the figure), which can be used to realize the electrical connection between a plurality of battery monomers 20, such as parallel connection or series connection or hybrid connection. Specifically, the current collecting component can realize the electrical connection between the battery monomers 20 by connecting the electrode terminals 70 of the battery monomers 20; or the current collecting component can also realize the electrical connection between the battery monomers 20 by connecting other components of the battery monomers 20. The current collecting component can be fixed to the corresponding components of the battery monomers 20 by welding, for example, can be fixed to the electrode terminals 70 or the shell 1000, etc., and the embodiments of the present application are not limited thereto.

[0092] Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in an embodiment of this application, combined with... Figure 3 As shown, the battery cell 20 includes a housing 1000, which encapsulates the electrode assembly 60 and electrolyte components. The housing 1000 includes a shell 100 with a metal layer and a cover plate 200. The shell 100 is a hollow structure with a first opening, and the cover plate 200 covers the first opening, forming a sealed connection with the shell 100. One or more electrode assemblies 60 can be placed inside the hollow structure. In this battery cell 20, depending on actual usage requirements, the electrode assembly 60 can be single or multiple. The electrode assembly 60 can be a wound structure or a stacked structure; the embodiments of this application are not limited to these.

[0093] The housing 1000 can be shaped according to the combination of one or more electrode components 60, for example, the housing 1000 can be a cuboid, cube or cylinder.

[0094] like Figure 3 As shown, the battery cell 20 also includes two electrode terminals 70, which may be disposed on the cover plate 200. The electrode terminals 70 are located on the surface of the cover plate 200 and pass through the cover plate 200. The electrode terminals 70 include a positive electrode terminal 70 and a negative electrode terminal 70. Each electrode terminal 70 is provided with a corresponding connecting member, which may also be a current collector or a copper-aluminum adapter piece, located between the cover plate 200 and the electrode assembly 60.

[0095] In the embodiments of this application, such as Figure 3 As shown, the battery cell 20 also includes a pressure relief mechanism 50, which can be disposed on the cover plate 200 and sealed to the metal layer of the cover plate 200. The pressure relief mechanism 50 is actuated to release the internal pressure when the internal pressure of the casing 1000 reaches a threshold. Under normal conditions, the pressure relief mechanism 50, as part of the battery cell 20, forms a sealed, airtight space with the casing 1000. However, when the battery cell 20 produces too much emissions, the emissions expand, causing the internal pressure of the battery cell 20 to rise above a preset value. At this point, the pressure relief mechanism 50 can rupture, allowing communication between the inside and outside of the battery cell 20. The emissions are released outward through the rupture in the pressure relief area, thereby reducing the possibility of an explosion.

[0096] Figure 4 This is a structural schematic diagram of the outer casing 1000 applicable to embodiments of this application, combined with... Figure 4As shown, the metal layer of the shell 100 and the metal layer of the cover plate 200 are connected to form a weld 1011, and the shell 1000 further comprises a reinforcing structure 300 which is connected in a laminated manner with the shell 100 and / or the cover plate 200, and the tensile strength of the reinforcing structure 300 is greater than or equal to the tensile strength of the shell 100 and the cover plate 200.

[0097] In some embodiments, the material of the reinforcing structure 300 is a carbon fiber resin composite material, and the reinforcing structure 300 can be connected with the shell 100 and / or the cover plate 200 by resin thermosetting forming, for example, the reinforcing structure 300 is directly thermoset formed and attached to the surface of the metal layer, or the carbon fiber is woven into a three-dimensional structure, and the three-dimensional structure is sleeved on the surface of the metal layer, and the resin is heated and thermoset connected with the metal layer.

[0098] In some embodiments, Table 1 provides the tensile strength corresponding to the different thicknesses of the reinforcing structure 300 when the material of the reinforcing structure 300 is a carbon fiber resin composite material.

[0099] Table 1 Thickness and tensile strength of the reinforcing structure 300

[0100]

[0101] In combination with Table 1, the tensile strength of the reinforcing structure 300 ranges from [200MPa, 2500MPa], for example, the tensile strength of the reinforcing structure 300 is 200MPa, 500MPa, 800MPa, 1000MPa, 1500MPa, 2000MPa or 2500MPa, or the tensile strength of the reinforcing structure 300 is greater than 200MPa, and the embodiments of the present application are not limited thereto.

[0102] In some embodiments, the thickness of the heating structure ranges from [0.1mm, 0.5mm], for example, the thickness of the heating structure can be 0.1mm, 0.2mm, 0.4mm or 0.5mm, and the embodiments of the present application are not limited thereto.

[0103] By setting the thickness range and tensile strength of the reinforcing structure 300, the reinforcing structure 300 can meet the sufficient strength performance while minimizing the occupation of the internal space of the battery device to optimize the energy density of the battery device.

[0104] The shell 1000 can better maintain its integrity, and prevent safety hazards caused by the rupture of the shell 1000, by connecting the reinforcing structure 300 to the surface of the metal layer of the shell 1000 and / or the metal layer of the cover plate 200. By enhancing the performance of the shell 1000 of the battery monomer 20, the electrochemical system inside the battery can be protected, and the leakage of active substances can be avoided, thereby significantly improving the safety performance of the battery device. In addition, the enhanced shell 1000 can also reduce the damage to the battery caused by mechanical impact or vibration during transportation and use, prolong the service life of the battery, and improve its reliability and durability.

[0105] Figures 4 to 5 A structural diagram suitable for the shell 1000 of the embodiment of the present application is shown.

[0106] For example, in combination with Figure 4 As shown, the reinforcing structure 300 is arranged on the side of the shell 100 away from the electrode assembly 60, and the reinforcing structure 300 is connected in layers with the shell 100.

[0107] For example, in combination with Figure 5 As shown, the reinforcing structure 300 is arranged on the side of the shell 100 and the cover plate 200 away from the electrode assembly 60, and the reinforcing layer is connected with the side surface of the shell 100 and the side surface of the cover plate 200, and the reinforcing structure 300 can continuously cover at least part of the welding seam 1011 formed by the connection of the shell 100 and the cover plate 200, that is, in the area where the welding seam 1011 is located, the reinforcing structure 300 can be a continuous and integral structure.

[0108] The welding seam 1011 is the weakest area of the shell 1000, and by covering the welding seam 1011 with the reinforcing structure 300, the reliability of the shell can be further improved.

[0109] In some possible embodiments, the reinforcing structure 300 can cover all the welding seams 1011.

[0110] In some embodiments, in combination with Figure 5 As shown, the end of the reinforcing structure 300 on the shell 100 away from the cover plate 200 can have a certain vertical distance d1 from the bottom surface of the shell 100, which is the surface of the shell 100 opposite the first opening, and the vertical distance d1 can be in the range of [1mm, 50mm], but the embodiment of the present application is not limited thereto.

[0111] For example, in combination with Figure 6 is a structural diagram of a battery monomer 20 provided by the embodiment of the present application, in combination with Figure 6 As shown, the reinforcing structure 300 is arranged on the side of the shell 100 and the cover plate 200 away from the electrode assembly 60, and the reinforcing layer is connected with the side surface of the cover plate 200 and the side surface of the shell 100.

[0112] In some embodiments, in combination with Figure 6 As shown in FIG. 3, the reinforcing structure 300 can have a second opening, and the reinforcing structure 300 includes a first wall 301 opposite the second opening and at least one second wall 302, the first wall 301 and the second wall 302 enclosing a receiving cavity, the first wall 301 is stacked with the cover plate 200, and the second wall 302 is stacked with the shell 100. For example, the reinforcing structure 300 can be sleeved on the cover plate 200 and the shell 100 in a direction perpendicular to the cover plate 200, so that the weld 1011 can be accommodated in the receiving cavity. The direction perpendicular to the cover plate 200 is, for example, Figure 6 the z-axis as shown in FIG. 1.

[0113] In some possible embodiments, the cover plate 200 can be provided with an electrode terminal and / or a pressure relief mechanism, and a through hole is provided on the first wall 301, the through hole is provided opposite to the electrode terminal 70 or the pressure relief mechanism 50 provided on the cover plate 200. By providing the reinforcing structure 300 as a continuous covering integrated structure at the weld 1011, the strength of the shell 1000 at the area of the weld 1011 can be enhanced, and the possibility of cracking of the shell 1000 at the area of the weld 1011 can be reduced.

[0114] For another example, Figure 7 FIG. 1 is a schematic structural diagram of a shell 1000 suitable for embodiments of the present application, in combination with Figure 7 As shown in FIG. 3, the reinforcing structure 300 is also provided on the bottom surface of the shell 100, the reinforcing structure 300 is located on the side of the shell 100 and the cover plate 200 away from the electrode assembly 60, and is connected with the shell 100 and the cover plate 200.

[0115] In some embodiments, in combination with Figure 8 As shown in FIG. 3, the reinforcing structure 300 is a split structure, and the reinforcing structure 300 includes a first part 303 and a second part 304, the first part 303 and the second part 304 are respectively sleeved on the shell 1000. For example, the first part 303 and the second part 304 are respectively sleeved on the shell 100 and the cover plate 200 in opposite directions along the same axis (for example, Figure 8 the x-axis as shown in FIG. 1), the first part 303 and the second part 304 are connected to form a receiving cavity, the weld 1011 is accommodated in the receiving cavity, and the reinforcing structure 300 forms a continuous covering structure at the area of the weld 1011.

[0116] In some possible embodiments, one side of the first part 303 or the second part 304 facing the cover plate 200 is provided with a through hole corresponding to the electrode terminal 70 or the pressure relief mechanism 50 provided on the cover plate 200. By providing the continuous covering structure of the reinforcing structure 300 at the welding seam 1011, the strength of the area of the welding seam 1011 of the shell 1000 can be enhanced, and the possibility of cracking of the area of the welding seam 1011 of the shell 1000 can be reduced. The reinforcing structure 300 is divided into two parts, which is easier to process and completely wraps the shell 100 and the cover plate 200, and further enhances the strength of the shell 1000.

[0117] For example, Figure 9 is a structural schematic diagram of a battery monomer 20 provided by an embodiment of the present application, which is combined with Figure 9 As shown, the first part 303 and the second part 304 each include a top wall and a side wall, the top walls of the first part 303 and the second part 304 are oppositely arranged, the side walls of the first part 303 and the second part 304 are connected, and the top wall of the first part 303 or the second part 304 is stacked with the cover plate. For example, the first part 303 and the second part 304 can be respectively sleeved on the shell 100 and the cover plate 200 along the directions (for example, the z-axis shown in Figure 9 ) perpendicular to the cover plate 200 and opposite to each other, compared with the reinforcing structure 300 in Figure 8 , the reinforcing structure 300 is oppositely arranged along the x-axis, Figure 9 The gap at the connection of the first part 303 and the second part 304 of the reinforcing structure 300 provided in the present embodiment can be completely staggered with the welding seam 1011, which can further enhance the strength of the area of the welding seam 1011 of the shell 1000 and reduce the possibility of cracking of the area of the welding seam 1011 of the shell 1000.

[0118] In some embodiments, the connection of the first part 303 and the second part 304 can be partially overlapped, so as to further avoid the cracking of the area of the welding seam 1011 of the shell 1000 in thermal runaway, enhance the strength of the shell 1000, and thus realize the directional pressure relief of the battery monomer 20 and improve the safety performance of the battery monomer 20.

[0119] For another example, in combination with Figure 10 , the reinforcing structure 300 includes a plurality of parts, each part is connected with the surface of the shell 100 or the cover plate 200 in each direction, and one side of the reinforcing structure 300 connected with the cover plate 200 is provided with a through hole corresponding to the electrode terminal 70 or the pressure relief mechanism 50 provided on the cover plate 200, which is not limited in the present embodiment.

[0120] Figures 11 to 14 is a structural schematic diagram of the shell 1000 suitable for the present embodiment, which is combined with Figures 11 to 14As shown, the shell 1000 further comprises a thermal insulation layer 400, which is connected in a laminated manner with the reinforcing structure 300, or the thermal insulation layer 400 is connected in a laminated manner with the cover plate 200, or the thermal insulation layer 400 is connected in a laminated manner with the shell 100, and the thermal insulation layer 400 is located on the side of the reinforcing structure 300 facing the electrode assembly 60.

[0121] For example, in combination with Figure 11 As shown, the thermal insulation layer 400 and the reinforcing structure 300 are both arranged on the side of the shell 100 and / or the cover plate 200 away from the electrode assembly 60, the thermal insulation layer 400 is located between the reinforcing structure 300 and the shell 1000, for example, the thermal insulation layer 400 can be located between the reinforcing structure 300 and the shell 100 or the cover plate 200. By arranging the thermal insulation layer 400 and the position of the thermal insulation layer 400, the high temperature resistance of the shell 1000 can be effectively improved, and the overall strength of the shell 1000 is enhanced. At the same time, the thermal insulation layer 400 and the reinforcing structure 300 are both located on the outside of the shell 100 or the cover plate 200, which reduces the occupation of the internal space of the battery monomer 20 and is easier to process and realize.

[0122] For another example, in combination with Figure 12 As shown, the thermal insulation layer 400 is arranged on the side of the shell 100 facing the electrode assembly 60, the reinforcing structure 300 is arranged on the side of the shell 100 away from the electrode assembly 60, and the metal layer is located between the thermal insulation layer 400 and the reinforcing structure 300.

[0123] In some embodiments, in combination with Figure 12 As shown, when the thermal insulation layer 400 is located on the side of the shell 100 facing the electrode assembly 60, a certain distance needs to be reserved for the welding and sealing of the metal layer of the shell 100 and the metal layer of the cover plate 200. Before the metal layer of the shell 100 and the metal layer of the cover plate 200 are welded, the distance d2 reserved from the end of the thermal insulation layer 400 on the shell 100 facing the first opening to the first opening is in the range of [1mm, 5mm], for example, the reserved distance d2 can be 1mm, 1.5mm, 2mm, 3mm, 4mm or 5mm, etc., but the embodiments of the present application are not limited thereto.

[0124] In some embodiments, in combination with Figure 13 As shown, when the thermal insulation layer 400 is located on the side of the shell 100 facing the electrode assembly 60, the metal layer of the shell 100 and the metal layer of the cover plate 200 are welded.

[0125] In some possible embodiments, the thermal insulation layer 400 can be arranged on the shell 100, and the thermal insulation layer 400 and the cover plate 200 can be arranged at intervals.

[0126] In some embodiments, in combination with Figure 14As shown, the reinforcing structure 300 and the thermal insulation layer 400 are located on the side of the shell 100 facing the electrode assembly 60, and the reinforcing structure 300 is located between the shell 100 and the thermal insulation layer 400.

[0127] In some embodiments, when the thermal insulation layer 400 is located on the side of the metal layer facing the electrode assembly 60, the material of the thermal insulation layer 400 satisfies electrolyte corrosion resistance, or the side of the thermal insulation layer 400 facing the electrode assembly 60 is connected with an electrolyte corrosion resistant material, and the embodiments of the present application are not limited thereto.

[0128] In some embodiments, the material of the thermal insulation layer 400 has high temperature resistance, for example, Figure 15 is a temperature change diagram of the two sides of the thermal insulation layer 400 when a heat source is applied to the thermal insulation layer 400. In combination with Figure 15 As shown, when a heat source of 1000℃ is applied to one side of the thermal insulation layer 400, the temperature of the two sides of the thermal insulation layer 400 is monitored within 60s, the temperature of the side of the thermal insulation layer 400 close to the heat source is 1000℃, and the temperature of the side of the thermal insulation layer 400 away from the heat source is less than 300℃, and the material of the thermal insulation layer 400 can satisfy the thermal insulation requirement.

[0129] In some embodiments, the material of the thermal insulation layer 400 is at least one of the following materials: aerogel material, ceramic material, asbestos, rock wool or mica material.

[0130] In some embodiments, the thickness of the thermal insulation layer 400 ranges from [0.1mm, 0.5mm], for example, the thickness of the thermal insulation layer 400 can be 0.1mm, 0.2mm, 0.4mm or 0.5mm, and the embodiments of the present application are not limited thereto.

[0131] The embodiments of the present application can effectively improve the thermal insulation performance of the shell 1000 by arranging the thermal insulation layer 400 on the shell 1000, and protect the metal layer and the reinforcing structure 300 from high temperature damage in extreme conditions such as thermal runaway, and effectively protect the strength and stability of the shell 1000 in a high temperature environment.

[0132] In some embodiments, the material of the metal layer is aluminum or stainless steel material, and the embodiments of the present application are not limited thereto.

[0133] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. 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 by, The shell (1000) comprises a shell (100) with a metal layer and a cover plate (200), the shell (100) is a hollow structure with a first opening, and the cover plate (200) is arranged on the first opening and connected with the shell (100); An electrode assembly (60) is arranged in the hollow structure; The shell (1000) further comprises a reinforcing structure (300) which is connected with the shell (100) and / or the cover plate (200) in a laminated manner, and the tensile strength of the reinforcing structure (300) is greater than or equal to the tensile strength of the shell (100) and the cover plate (200). The reinforcing structure (300) is arranged on the side of the cover plate (200) or the shell (100) away from the electrode assembly (60).

2. The battery cell of claim 1, wherein, The connection between the shell (100) and the cover plate (200) forms a weld (1011), and the reinforcing structure (300) covers at least part of the weld (1011).

3. The battery cell of claim 1, wherein, The reinforcing structure (300) covers all of the weld (1011).

4. The battery cell of claim 3, wherein, The reinforcing structure (300) has a second opening, and comprises a first wall (301) opposite the second opening and at least one second wall (302), the first wall (301) and the second wall (302) form an accommodation cavity, the first wall (301) is arranged in a laminated manner with the cover plate (200), and the second wall is arranged in a laminated manner with the shell, and the weld (1011) is arranged in the accommodation cavity.

5. The battery cell of claim 3, wherein, The cover plate (200) is provided with an electrode terminal and / or a pressure relief mechanism, the first wall is provided with a through hole, and the through hole is arranged opposite the electrode terminal and / or the pressure relief mechanism.

6. The battery cell of claim 5, wherein, The reinforcing structure (300) comprises a first part (303) and a second part (304), the first part (303) and the second part (304) are respectively sleeved on the shell (1000), the first part (303) and the second part (304) are connected to form an accommodation cavity, and the weld (1011) is arranged in the accommodation cavity.

7. The battery cell of claim 3, wherein, One side of the first part (303) and / or the second part (304) facing the cover plate (200) is provided with a through hole, and the through hole is arranged opposite the electrode terminal or the pressure relief mechanism arranged on the cover plate (200).

8. The battery cell of claim 7, wherein, The first part (303) and the second part (304) each comprise a top wall and a side wall, the top walls of the first part (303) and the second part (304) are arranged opposite each other, the side walls of the first part (303) and the second part (304) are connected, and the top wall of the first part (303) or the second part (304) is arranged in a laminated manner with the cover plate.

9. The battery cell of claim 7, wherein, The material of the reinforcing structure (300) is carbon fiber resin composite material.

10. The battery cell of claim 1, wherein, The thickness of the reinforcing structure (300) ranges from 0.1mm to 0.5mm.

11. The battery cell of claim 1, wherein, ​ 12. The battery cell of any one of claims 1 to 11, wherein, The tensile strength of the reinforcing structure (300) ranges from [200 MPa, 2500 MPa].

13. The battery cell of claim 1, wherein, The outer shell (1000) further comprises a thermal insulation layer (400) which is connected in layers with the reinforcing structure (300), the cover plate (200) or the shell (100), and the thermal insulation layer (400) is located on the side of the reinforcing structure (300) facing the electrode assembly (60).

14. The battery cell of claim 13, wherein, The thermal insulation layer (400) is located between the reinforcing structure (300) and the outer shell.

15. The battery cell of claim 13, wherein, The thermal insulation layer (400) is located on the side of the cover plate (200) or the shell (100) facing the electrode assembly (60).

16. The battery cell of claim 13, wherein, The thermal insulation layer (400) is provided on the shell (100), and the thermal insulation layer (400) is spaced apart from the cover plate (200).

17. The battery cell of claim 13, wherein, The material of the thermal insulation layer (400) is one of the following materials: aerogel material, ceramic material, asbestos, rock wool or mica material.

18. The battery cell of any one of claims 13-17, wherein, The thickness of the thermal insulation layer (400) ranges from [0.1 mm, 0.5 mm].

19. A battery device characterized by comprising: Comprising: A plurality of battery monomers, the battery monomers being as claimed in any one of claims 1-18.

20. An electrical device, comprising: Comprising: A battery device, the battery device comprising battery monomers as claimed in any one of claims 1-18, the battery device being used to power the electrical equipment.

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