Isolation assembly, battery, manufacturing method and manufacturing system of battery, and electric device

Abstract

The invention discloses an isolation assembly, a battery, a manufacturing method and a manufacturing system of the battery, and a power utilization device. The isolation assembly provided by the embodiment of the invention is used for being arranged between adjacent single batteries. The isolation assembly includes an isolation member and a gas generating material. The separator is provided with an accommodating cavity. The gas production material is contained in the containing cavity, and the gas production material is used for releasing gas when the temperature of the gas production material reaches a threshold value, so that the isolation piece is expanded. When a certain battery cell is in thermal runaway, heat generated by the battery cell is transferred to the gas production material of the isolation assembly; when the temperature of the gas production material reaches a threshold value, the gas production material releases gas to enable the separator to expand, so that the distance between the normal battery monomer and the thermal runaway battery monomer is increased, the heat transfer path is prolonged, the thermal diffusion rate is reduced, and the safety risk is reduced. The isolation assembly provided by the invention can have different thicknesses in a thermal runaway state and a normal state, so that the requirements of the battery on energy density and heat insulation capability can be met at the same time.

Description

[0001] This application is a divisional application based on the application number 202110739795.8, the application date June 30, 2021, the applicant being Contemporary Amperex Technology Co., Ltd., and the application name being "Isolation components, batteries, their manufacturing methods and manufacturing systems, and electrical devices". Technical Field

[0002] The present application relates to the field of batteries, and in particular to an isolation component, a battery, a manufacturing method and a manufacturing system thereof, and an electrical device. Background Art

[0003] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0004] In the development of battery technology, safety is also an issue that cannot be ignored, especially when multiple battery cells are used in groups. How to enhance safety is a technical problem that needs to be solved urgently in battery technology. Summary of the Invention

[0005] The present application provides an isolation component, a battery, a manufacturing method and a manufacturing system thereof, and an electrical device, which can improve the safety performance of the battery.

[0006] In a first aspect, the present application provides an isolation assembly for placement between adjacent battery cells. The isolation assembly includes an isolation member and a gas-generating material. The isolation member has a receiving cavity. The gas-generating material is housed in the receiving cavity and is configured to release gas when its temperature reaches a threshold, thereby causing the isolation member to expand.

[0007] In the above scheme, when a battery cell experiences thermal runaway, the heat it generates is transferred to the gas-generating material of the isolation component; when the temperature of the gas-generating material reaches a threshold value, the gas-generating material releases gas to expand the isolation component, thereby increasing the distance between the normal battery cell and the battery cell with thermal runaway, thereby extending the heat transfer path; at the same time, the thermal conductivity of the gas is small, so the gas can improve the thermal insulation capacity of the isolation component; therefore, the isolation component of the embodiment of the present application can reduce the heat diffusion rate and reduce safety risks.

[0008] The isolation assembly of this application expands to extend the heat transfer path when a battery cell experiences thermal runaway. Therefore, this application eliminates the need to increase the thickness of the isolation assembly in its normal state, thereby maintaining the battery's energy density. In other words, the isolation assembly of this application can have different thicknesses in a thermal runaway state and in its normal state, thus balancing the battery's energy density and thermal insulation requirements.

[0009] In some embodiments, a heat shield is also included, housed within the housing cavity. The heat shield in the embodiments of the present application can improve the thermal insulation capability of the isolation assembly and reduce heat diffusion between battery cells. When the gas-generating material releases gas and the separator expands, the heat shield can block the gas, reducing thermal convection, improving the isolation assembly's thermal insulation capability, slowing the rate of heat diffusion, and mitigating safety risks.

[0010] In some embodiments, the heat insulation board is fixed to the isolating member. By fixing the heat insulation board to the isolating member, the embodiment of the present application can prevent the heat insulation board from shaking in the accommodation cavity, reduce the risk of the heat insulation board puncturing the isolating member, and ensure the sealing of the isolating member.

[0011] In some embodiments, the insulation board has two surfaces disposed opposite each other in its thickness direction, and the gas-generating material is laminated to at least one surface of the insulation board; alternatively, the gas-generating material is in liquid form and permeates the insulation board. In this embodiment of the present application, the gas-generating material is fixed to the insulation board so that it can be placed into the receiving cavity along with the insulation board, thereby simplifying the assembly process of the insulation assembly.

[0012] In some embodiments, the gas-generating material includes expandable graphite and carbonate. When the temperatures of the expandable graphite and the carbonate reach thresholds, the expandable graphite expands and deforms, the carbonate releases gas, and the separator expands and deforms under the action of the expanded graphite and gas, thereby increasing the distance between adjacent battery cells.

[0013] In some embodiments, the isolation member includes: a shell having an opening; and a sealing cover covering the opening of the shell to form a receiving cavity.

[0014] In some embodiments, the thickness of the cavity wall of the accommodating cavity is 0.01 mm to 2 mm. The smaller the thickness of the cavity wall of the accommodating cavity, the higher the energy density of the battery and the faster the expansion of the gas generating material when the gas is released.

[0015] In some embodiments, the melting point of the separator is greater than a threshold value. When the gas generating material releases gas, the separator will not melt, thereby ensuring the sealing of the accommodating cavity and allowing the separator to expand rapidly.

[0016] In some embodiments, the isolation assembly further includes an adhesive member disposed on an outer surface of the isolation assembly and configured to adhere to the battery cell. The isolation assembly of the present invention is secured to the battery cell by the adhesive member, thereby simplifying the assembly process of the isolation assembly and the battery cell.

[0017] In a second aspect, an embodiment of the present application provides a battery, comprising: a plurality of battery cells; and an isolation assembly as in any embodiment of the first aspect, wherein the isolation assembly is disposed between adjacent battery cells.

[0018] In a third aspect, an embodiment of the present application provides an electrical device, comprising the battery of the second aspect, the battery being used to provide electrical energy.

[0019] In a fourth aspect, an embodiment of the present application provides a method for manufacturing a battery, comprising:

[0020] Providing battery cells;

[0021] An isolation assembly is provided, the isolation assembly comprising an isolation member and a gas-generating material, the isolation member having a receiving cavity, the gas-generating material being received in the receiving cavity, the gas-generating material being configured to release gas when the temperature of the gas-generating material reaches a threshold value, thereby causing the isolation member to expand;

[0022] A plurality of battery cells and a spacer assembly are assembled so as to dispose the spacer assembly between adjacent battery cells.

[0023] In a fifth aspect, an embodiment of the present application provides a battery manufacturing system, comprising:

[0024] A first providing device, configured to provide a battery cell;

[0025] A second providing device is used to provide an isolation assembly, the isolation assembly including an isolation member and a gas generating material, the isolation member having a receiving cavity, the gas generating material being received in the receiving cavity, the gas generating material being used to release gas when the temperature of the gas generating material reaches a threshold value, thereby causing the isolation member to expand;

[0026] The assembly device is used for assembling a plurality of battery cells and an isolation assembly so as to place the isolation assembly between adjacent battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0028] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0029] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0030] Figure 3 for Figure 2 A schematic structural diagram of the battery module shown;

[0031] Figure 4 An exploded schematic diagram of an isolation assembly provided in some embodiments of the present application;

[0032] Figure 5 for Figure 4 An enlarged schematic diagram of the isolation assembly shown at circle A;

[0033] Figure 6 A schematic cross-sectional view of an isolation assembly provided in some embodiments of the present application;

[0034] Figure 7 for Figure 6 An enlarged schematic diagram of the isolation assembly shown at circle B;

[0035] Figure 8 A schematic structural diagram of an isolation assembly provided in some other embodiments of the present application;

[0036] Figure 9 A schematic flow chart of a method for manufacturing a battery according to some embodiments of the present application;

[0037] Figure 10 A schematic block diagram of a battery manufacturing system provided for some embodiments of the present application.

[0038] In the accompanying drawings, the drawings are not necessarily drawn to scale. DETAILED DESCRIPTION

[0039] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0040] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0041] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0043] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0044] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0045] The term "plurality" used in this application refers to two or more (including two).

[0046] In this application, battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0047] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery generally includes a casing that encloses one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0048] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive current collector portion and a positive protrusion protruding from the positive current collector portion. The positive current collector portion is coated with the positive active material layer. At least a portion of the positive protrusion portion is not coated with the positive active material layer. The positive protrusion portion serves as a positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum. The positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, among others. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collecting portion and a negative electrode protrusion protruding from the negative electrode current collecting portion, the negative electrode current collecting portion is coated with the negative electrode active material layer, and at least part of the negative electrode protrusion is not coated with the negative electrode active material layer, and the negative electrode protrusion serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current passes without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene), etc. In addition, the electrode assembly can be a wound structure or a laminated structure, and the embodiments of the present application are not limited to this.

[0049] When a battery cell experiences a short circuit, overcharge, or other issues, it can experience thermal runaway and spread heat to the surrounding area. The inventors discovered that when heat spreads to other healthy cells, it can cause thermal runaway in the previously healthy cells, leading to a safety incident.

[0050] In light of this, embodiments of the present application provide an isolation assembly for placement between adjacent battery cells. The isolation assembly comprises: an isolation member having a housing cavity; and a gas-generating material housed in the housing cavity. The gas-generating material is configured to release gas when the temperature of the gas-generating material reaches a threshold, thereby causing the isolation member to expand. This isolation assembly structure can reduce the rate of heat diffusion in the event of thermal runaway in a battery cell, minimizing safety risks and improving battery safety performance.

[0051] The isolation assembly described in the embodiments of the present application is applicable to batteries and electrical devices using batteries.

[0052] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, etc. Vehicles may include fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0053] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0054] Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application. Figure 1 As shown, a battery 2 is provided inside the vehicle 1, and the battery 2 can be provided at the bottom, head, or tail of the vehicle 1. The battery 2 can be used to power the vehicle 1, for example, the battery 2 can be used as an operating power source for the vehicle 1.

[0055] The vehicle 1 may further include a controller 3 and a motor 4 . The controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0056] In some embodiments of the present application, the battery 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0057] Figure 2 Schematic diagram of the explosion of the battery provided in some embodiments of the present application. Figure 2 As shown, the battery 2 includes a box 5 and a battery cell ( Figure 2 The battery cells are housed in the box body 5 .

[0058] The housing 5 is used to accommodate battery cells and can have various structures. In some embodiments, the housing 5 can include a first housing portion 51 and a second housing portion 52. The first housing portion 51 and the second housing portion 52 overlap each other and together define a storage space 53 for accommodating the battery cells. The second housing portion 52 can be a hollow structure with one end open. The first housing portion 51 is a plate-like structure, and the first housing portion 51 overlaps the open side of the second housing portion 52 to form the housing 5 with the storage space 53. The first housing portion 51 and the second housing portion 52 can also each be a hollow structure with one end open. The open side of the first housing portion 51 overlaps the open side of the second housing portion 52 to form the housing 5 with the storage space 53. Of course, the first housing portion 51 and the second housing portion 52 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0059] In order to improve the sealing performance after the first box body 51 and the second box body 52 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 51 and the second box body 52 .

[0060] Assuming that the first box portion 51 covers the top of the second box portion 52 , the first box portion 51 can also be referred to as an upper box cover, and the second box portion 52 can also be referred to as a lower box.

[0061] Battery 2 includes multiple battery cells. These cells can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. Multiple battery cells can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire battery module can be housed within housing 5. Alternatively, multiple battery cells can be first connected in series, in parallel, or in a hybrid configuration to form a battery module 6, and then multiple battery modules 6 can be connected in series, in parallel, or in a hybrid configuration to form a single unit housed within housing 5.

[0062] Figure 3 for Figure 2 The structural diagram of the battery module is shown in FIG. Figure 3 As shown, in some embodiments, there are multiple battery cells 7, which are first connected in series, in parallel, or in series to form a battery module 6. The multiple battery modules 6 are then connected in series, in parallel, or in series to form a whole and accommodated in a box.

[0063] The multiple battery cells 7 in the battery module 6 can be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 7 in the battery module 6 .

[0064] In some embodiments, the battery module 6 also includes two end plates 61 and two side plates 62. The two end plates 61 are located at both ends of the multiple battery cells 7 along the arrangement direction. The two side plates 62 are connected to the two end plates 61 and form a generally rectangular frame structure to fix the multiple battery cells 7.

[0065] In some embodiments, the battery module 6 further includes an isolation assembly 8, which is configured to be disposed between adjacent battery cells 7. In the battery module 6, isolation assemblies 8 may be disposed between some adjacent battery cells 7, while isolation assemblies 8 may not be disposed between other adjacent battery cells 7. Alternatively, isolation assemblies 8 may be disposed between all adjacent battery cells 7.

[0066] In some embodiments, an isolation assembly 8 may also be provided between the end plate 61 and the battery cell 7 .

[0067] The isolation assembly 8 of the embodiment of the present application can separate adjacent battery cells 7, extend the heat transfer path between adjacent battery cells 7, reduce the heat diffusion rate, and reduce safety risks.

[0068] To improve the battery's thermal diffusion performance and reduce the thermal diffusion rate, the inventors attempted to increase the thickness of the isolation assembly to increase the heat transfer path between adjacent battery cells and reduce the thermal diffusion rate. However, the inventors found that increasing the thickness of the isolation assembly resulted in a loss in battery energy density.

[0069] Based on the above problems discovered by the inventors, the inventors have improved the structure of the isolation component, which is described in detail below in conjunction with different embodiments.

[0070] Figure 4 An exploded schematic diagram of an isolation assembly provided in some embodiments of the present application; Figure 5 for Figure 4 An enlarged schematic diagram of the isolation assembly shown at circle A; Figure 6 A schematic cross-sectional view of an isolation assembly provided in some embodiments of the present application; Figure 7 for Figure 6 An enlarged schematic diagram of the isolation assembly shown at circle B.

[0071] like Figures 3 to 7 As shown, the isolation assembly 8 of the embodiment of the present application is used to be set between adjacent battery cells 7, and includes: an isolation member 81 having a accommodating cavity 811; and a gas-generating material 82 accommodated in the accommodating cavity 811, and the gas-generating material 82 is used to release gas when the temperature of the gas-generating material 82 reaches a threshold value to cause the isolation member 81 to expand.

[0072] The isolator 81 is a hollow structure, and a sealed accommodating cavity 811 is formed inside the isolator 81. The isolator 81 can have multiple structural forms. For example, the isolator 81 can be an integral structure or a structure formed by sealingly connecting multiple components.

[0073] The separator 81 may be a flat structure, and the battery cells 7 may be disposed on both sides of the separator 81 along its thickness direction. The separator 81 may be in various shapes, such as circular, square, etc.

[0074] This application does not limit the type or state of the gas-generating material 82, as long as it can release gas when the temperature reaches a threshold. The gas-generating material 82 can be liquid, solid, or a solid-liquid mixture. The gas released by the gas-generating material 82 can be carbon dioxide or other gases.

[0075] The "threshold" mentioned in this application is not required to be a specific temperature value, but can be a temperature range. For example, the "threshold" is 90°C-1000°C, and optionally, the "threshold" is 100°C-400°C.

[0076] When a battery cell 7 experiences thermal runaway, the heat it generates is transferred to the gas-generating material 82 of the isolation component 8; when the temperature of the gas-generating material 82 reaches a threshold value, the gas-generating material 82 releases gas to expand the isolation component 81, thereby increasing the distance between the normal battery cell 7 and the battery cell 7 with thermal runaway, thereby extending the heat transfer path; at the same time, the thermal conductivity of the gas is small, so the gas can improve the thermal insulation capacity of the isolation component 8; therefore, the isolation component 8 of the embodiment of the present application can reduce the heat diffusion rate and reduce safety risks.

[0077] The isolation assembly 8 of this application expands to extend the heat transfer path when the battery cell 7 experiences thermal runaway. Therefore, this application eliminates the need to increase the thickness of the isolation assembly 8 in its normal state, thereby maintaining the battery's energy density. In other words, the isolation assembly 8 of this application can have different thicknesses in the thermal runaway state and in its normal state, thus balancing the battery's energy density and thermal insulation requirements.

[0078] In some embodiments, the isolation assembly 8 further includes a heat insulation plate 83 , which is accommodated in the accommodation cavity 811 .

[0079] The heat insulation board 83 is made of heat insulation material, and it can block the transfer of heat.For example, the heat insulation board 83 can be made of aerogel or ceramic.

[0080] The heat insulation plate 83 may be fixed to the isolation member 81 or may be movably provided on the isolation member 81 , which is not limited in this embodiment.

[0081] The shape of the heat insulating plate 83 matches the shape of the accommodating cavity 811. Exemplarily, the heat insulating plate 83 is a flat plate structure.

[0082] The gas generating material 82 may be fixed to the heat insulating plate 83 or may be provided independently of the heat insulating plate 83 .

[0083] Exemplarily, the thickness of the heat shield 83 is 0.05 mm to 3 mm.

[0084] The thermal insulation board 83 of the present embodiment can improve the thermal insulation capacity of the isolation assembly 8 and reduce the diffusion of heat between the battery cells 7. When the gas-generating material 82 releases gas and the separator 81 expands, the thermal insulation board 83 can block the gas, reducing the heat convection of the gas, improving the thermal insulation capacity of the isolation assembly 8, reducing the heat diffusion rate, and reducing safety risks.

[0085] In some embodiments, the thermal insulation board 83 is fixed to the isolation member 81 .

[0086] The heat insulating plate 83 may be directly or indirectly fixed to the isolating member 81. For example, the heat insulating plate 83 may be bonded to the isolating member 81 by an adhesive, or the accommodating chamber 811 may be evacuated to bond the heat insulating plate 83 to the isolating member 81 under negative pressure.

[0087] The embodiment of the present application can prevent the insulation board 83 from shaking in the accommodating cavity 811 by fixing the insulation board 83 to the isolation member 81, reduce the risk of the insulation board 83 puncturing the isolation member 81, and ensure the sealing of the isolation member 81.

[0088] In some embodiments, the heat insulation board 83 has two surfaces disposed opposite to each other in its thickness direction, and the gas generating material 82 is composited onto at least one surface of the heat insulation board 83 .

[0089] The gas generating material 82 is a thin layer structure, which can be composited onto at least one surface of the heat insulation board 83 by coating, lamination or other processes.

[0090] The gas generating material 82 may be compounded onto only one surface of the heat insulation board 83 or onto both surfaces of the heat insulation board 83. For example, the gas generating material 82 is compounded onto both surfaces of the heat insulation board 83.

[0091] In the embodiment of the present application, the gas-generating material 82 is compounded onto the heat insulation board 83 , so that the gas-generating material 82 can be placed into the accommodating cavity 811 together with the heat insulation board 83 , thereby simplifying the assembly process of the isolation component 8 .

[0092] In some embodiments, the gas generating material 82 is in liquid form and permeates into the thermal insulation board 83 .

[0093] The heat insulation board 83 may have a porous structure, and the liquid gas generating material 82 can penetrate into the porous structure and be stored in the heat insulation board 83 .

[0094] In the embodiment of the present application, the gas-generating material 82 is infiltrated into the heat insulation board 83 , so that the gas-generating material 82 can be placed into the accommodating cavity 811 together with the heat insulation board 83 , thereby simplifying the assembly process of the isolation component 8 .

[0095] In some embodiments, the gas generating material 82 includes expandable graphite and carbonates.

[0096] When the temperature of the expandable graphite and the temperature of the carbonate reach a threshold, the expandable graphite expands and deforms, and the carbonate releases gas. The separator 81 expands and deforms under the action of the expanded graphite and gas to increase the distance between adjacent battery cells 7.

[0097] In other embodiments, the gas generating material 82 further includes a cooling liquid, such as water.

[0098] In some embodiments, the isolation member 81 includes: a shell 812 having an opening 813 ; and a sealing cover 814 covering the opening 813 of the shell 812 to form a receiving cavity 811 .

[0099] The shell 812 may be a hollow structure with one side open. The sealing cover 814 covers the opening of the shell 812 and forms a sealed connection to form an accommodating chamber 811 for accommodating the gas-generating material 82 .

[0100] The shell 812 may also be a hollow structure with openings on two opposite sides. Two sealing covers 814 respectively cover the two openings and form a sealed connection to form an accommodating chamber 811 for accommodating the gas-generating material 82 .

[0101] The sealing cover 814 can be sealedly connected to the housing 812 by bonding or welding.

[0102] In some embodiments, the wall thickness d of the accommodating cavity 811 is 0.01 mm to 2 mm. The smaller the wall thickness of the accommodating cavity 811 , the higher the energy density of the battery and the faster the expansion of the gas generating material 82 when it releases gas.

[0103] Exemplarily, the thickness d of the cavity wall of the accommodating cavity 811 is 0.05 mm-1 mm.

[0104] In some embodiments, the melting point of the isolation member 81 is greater than a threshold value. The isolation member 81 is made of a high-temperature resistant material with a melting point greater than the threshold value. Thus, when the gas-generating material 82 releases gas, the isolation member 81 will not melt, thereby ensuring the sealing of the accommodating cavity 811 and allowing the isolation member 81 to expand rapidly.

[0105] Figure 8Schematic diagram of the structure of the isolation assembly provided in some other embodiments of the present application.

[0106] like Figure 8 As shown, in some embodiments, the isolation assembly 8 further includes an adhesive member 84 , which is disposed on an outer surface of the isolation member 81 and is used to be adhered to the battery cell 7 .

[0107] The embodiment of the present application does not limit the structure of the adhesive member 84 . For example, the adhesive member 84 can be a double-sided tape or a colloid coated on the outer surface of the isolation member 81 .

[0108] The isolation assembly 8 in the embodiment of the present application is fixed to the battery cell by providing an adhesive 84 , which helps to simplify the assembly process of the isolation assembly 8 and the battery cell.

[0109] Figure 9 A schematic flow chart of a method for manufacturing a battery provided in some embodiments of the present application.

[0110] like Figure 9 As shown, the manufacturing method of the battery of the embodiment of the present application includes:

[0111] S100, providing a battery cell;

[0112] S200, providing an isolation assembly, the isolation assembly comprising an isolation member and a gas-generating material, the isolation member having a receiving cavity, the gas-generating material being received in the receiving cavity, the gas-generating material being configured to release gas when a temperature of the gas-generating material reaches a threshold value, thereby causing the isolation member to expand;

[0113] S300 , assembling a plurality of battery cells and isolation assemblies, and placing the isolation assemblies between adjacent battery cells.

[0114] It should be noted that the relevant structure of the battery manufactured by the above-mentioned battery manufacturing method can refer to the batteries provided in the above-mentioned embodiments.

[0115] When assembling a battery based on the above-mentioned battery manufacturing method, it is not necessary to follow the above-mentioned steps in sequence. In other words, the steps can be performed in the order mentioned in the embodiment, or in a different order, or several steps can be performed simultaneously. For example, steps S100 and S200 can be performed in any order and can be performed simultaneously.

[0116] Figure 10 A schematic block diagram of a battery manufacturing system provided for some embodiments of the present application.

[0117] like Figure 10As shown, the battery manufacturing system 9 of the embodiment of the present application includes: a first providing device 91 for providing battery cells; a second providing device 92 for providing an isolation assembly, the isolation assembly including an isolation member and a gas-generating material, the isolation member having a accommodating cavity, the gas-generating material being accommodated in the accommodating cavity, the gas-generating material being used to release gas when the temperature of the gas-generating material reaches a threshold value to cause the isolation member to expand; an assembling device 93 for assembling multiple battery cells and isolation assemblies to set the isolation assembly between adjacent battery cells.

[0118] The relevant structures of the batteries manufactured by the above manufacturing system can refer to the batteries provided in the above embodiments.

[0119] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An isolation assembly for use between adjacent battery cells, characterized in that: include: an isolation member having a receiving cavity; as well as A gas generating material is contained in the containing cavity, and is used for releasing gas when the temperature of the gas generating material reaches a threshold value, so as to expand the isolation member.

2. The isolation assembly according to claim 1, wherein: It also includes a heat insulation board, which is accommodated in the accommodating cavity.

3. The isolation assembly according to claim 2, wherein: The heat insulation board is fixed to the isolation member.

4. The isolation assembly according to claim 2 or 3, characterized in that The heat insulation board has two surfaces arranged opposite to each other in its thickness direction, and the gas generating material is compounded onto at least one of the surfaces of the heat insulation board; or The gas generating material is in liquid form and permeates into the heat insulation board.

5. The isolation assembly according to claim 1, wherein: The gas generating material includes expandable graphite and carbonate.

6. The isolation assembly according to claim 1, wherein: The isolating member comprises: a housing having an opening; A sealing cover is covered on the opening of the shell to form the accommodating cavity.

7. The isolation assembly according to claim 1, wherein: The thickness of the cavity wall of the accommodating cavity is 0.01 mm-2 mm, and the melting point of the isolation member is greater than the threshold.

8. The isolation assembly according to claim 1, wherein: The isolation assembly further includes an adhesive member disposed on an outer surface of the isolation member and configured to be adhered to the battery cell.

9. A battery, characterized in that: include: Multiple battery cells; as well as The isolation assembly according to any one of claims 1 to 8, wherein the isolation assembly is arranged between adjacent battery cells.

10. An electrical device, characterized in that: The battery according to claim 9 is included for providing electrical energy.

11. A method for manufacturing a battery, characterized in that: include: Providing battery cells; Providing an isolation assembly, the isolation assembly comprising an isolation member and a gas-generating material, the isolation member having a receiving cavity, the gas-generating material being received in the receiving cavity, the gas-generating material being configured to release gas when the temperature of the gas-generating material reaches a threshold value, thereby causing the isolation member to expand; A plurality of the battery cells and the isolation assembly are assembled so as to place the isolation assembly between adjacent battery cells.

12. A battery manufacturing system, characterized in that: include: A first providing device, configured to provide a battery cell; A second providing device is configured to provide an isolation assembly, the isolation assembly comprising an isolation member and a gas generating material, the isolation member having a receiving cavity, the gas generating material being received in the receiving cavity, the gas generating material being configured to release gas when the temperature of the gas generating material reaches a threshold value, thereby causing the isolation member to expand; An assembling device is used to assemble a plurality of the battery cells and the isolation assembly, so as to place the isolation assembly between adjacent battery cells.

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