Battery device and electric equipment

Abstract

The utility model discloses a battery device and electric equipment, and relates to the technical field of batteries, the battery device comprises a battery box body and a battery cell, and the battery cell is arranged in the battery box body; the battery cell comprises a shell, an electrode assembly, an insulating sheet and an isolating membrane; the electrode assembly is arranged in the shell; the insulation sheet wraps the electrode assembly and is provided with an insulation bottom sheet wrapping the bottom of the electrode assembly, and the insulation bottom sheet is provided with first infiltration holes; and the isolating membrane is arranged between the bottom of the electrode assembly and the inner bottom wall of the shell, covers the first infiltration hole, is configured to isolate the conductive material falling from the electrode assembly, and is configured to penetrate through the electrolyte. The carbon powder can be prevented from falling off, and the electrolyte can be effectively absorbed to improve the infiltration effect, so that the phenomenon that black spot analysis exists on an interface due to poor infiltration of the electrolyte is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device and a power consumption equipment. BACKGROUND

[0002] The battery device generally comprises an electrode assembly and an aluminum shell, and the migration efficiency of the electrolyte gathered at the bottom of the aluminum shell is low, the electrolyte is difficult to be absorbed by the electrode assembly, and there is a problem of poor electrolyte infiltration, which leads to the phenomenon of interface black spot segregation. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the present application provides a battery device and a power consumption equipment, which aims to block the carbon powder from falling off and effectively absorb the electrolyte to improve the infiltration effect, so as to improve the phenomenon of interface black spot segregation caused by poor electrolyte infiltration.

[0004] The present application provides a battery device, comprising a battery box body and a battery cell, the battery cell is arranged in the battery box body; the battery cell comprises a shell, an electrode assembly, an insulating sheet and a separation film; the electrode assembly is arranged in the shell; the insulating sheet wraps the electrode assembly, and the insulating sheet has an insulating bottom sheet wrapped at the bottom of the electrode assembly, and the insulating bottom sheet is provided with a first infiltration hole; the separation film is arranged between the bottom of the electrode assembly and the inner bottom wall of the shell and covers the first infiltration hole, and the separation film is configured to isolate the conductive material falling off from the electrode assembly and configured to pass through the electrolyte.

[0005] In the technical scheme of the present application, the separation film is additionally arranged between the bottom of the electrode assembly and the inner bottom wall of the shell, and the separation film covers the first infiltration hole of the insulating sheet. The conductive material such as carbon powder falling off from the electrode assembly can be effectively isolated by the separation film, so as to avoid the conductive material falling off from the electrode assembly from falling onto the inner bottom wall of the shell through the first infiltration hole, so as to block the carbon powder from falling off; at the same time, the electrolyte in the shell can also pass through the separation film, so that the electrolyte in the shell can migrate upward through the separation film and the first infiltration hole to be efficiently absorbed by the electrode assembly. Therefore, by additionally arranging the separation film between the bottom of the electrode assembly and the inner bottom wall of the shell, the present application achieves the effect of blocking the carbon powder from falling off and effectively absorbing the electrolyte to improve the infiltration effect, so as to improve the phenomenon of interface black spot segregation caused by poor electrolyte infiltration.

[0006] In some embodiments, the separation film is arranged on the top surface or the bottom surface of the insulating bottom sheet. By arranging the separation film on the top surface or the bottom surface of the insulating bottom sheet and wrapping the electrode assembly with the insulating sheet provided with the separation film, the separation film can be reliably fixed between the bottom of the electrode assembly and the inner bottom wall of the shell.

[0007] In some embodiments, the battery device further comprises a bottom support sheet arranged at the bottom of the insulating bottom sheet and provided with a second infiltration hole, the first infiltration hole and the second infiltration hole being in communication; and the isolation film covers the first infiltration hole and the second infiltration hole. With the bottom support sheet arranged at the bottom of the insulating bottom sheet, the bottom support sheet can support the insulating bottom sheet, and the bottom of the electrode assembly can be further protected, so that the protective effect on the electrode assembly is improved, and the electrode assembly can be better prevented from being scratched when the electrode assembly is put into the shell. In addition, the second infiltration hole is arranged on the bottom support sheet and in communication with the first infiltration hole, and the isolation film covers the first infiltration hole and the second infiltration hole. When the electrolyte in the shell penetrates through the isolation film, the electrolyte in the shell can migrate upward through the isolation film, the first infiltration hole and the second infiltration hole, and be efficiently absorbed by the electrode assembly.

[0008] In some embodiments, the isolation film is arranged on the top surface or the bottom surface of the bottom support sheet. With the isolation film arranged on the top surface or the bottom surface of the bottom support sheet, and the bottom support sheet provided with the isolation film arranged at the bottom of the insulating bottom sheet, the isolation film can be reliably fixed between the bottom of the electrode assembly and the inner bottom wall of the shell.

[0009] In some embodiments, the isolation film is arranged on the inner bottom wall of the shell. With the isolation film arranged on the inner bottom wall of the shell, the isolation film can also be reliably fixed between the bottom of the electrode assembly and the inner bottom wall of the shell.

[0010] In some embodiments, the porosity of the isolation film is 40% to 60%. With the porosity of the isolation film controlled to be 40% to 60%, the ion conductivity and the electrolyte infiltration performance can be improved, so that sufficient electrolyte can penetrate through the isolation film and be efficiently absorbed by the electrode assembly; and the porosity can be prevented from being too high to affect the film forming property of the isolation film.

[0011] In some embodiments, the pore of the isolation film is less than 10 um. With the pore of the isolation film less than 10 um, the conductive material such as carbon powder dropped from the electrode assembly can be prevented from penetrating through the pores of the isolation film, so that the isolation film can effectively block the conductive material such as carbon powder dropped from the electrode assembly.

[0012] In some embodiments, the tensile strength of the isolation film is greater than or equal to 500 kgf / cm2. With the tensile strength of the isolation film controlled to be greater than or equal to 500 kgf / cm2, the phenomenon of damage and deformation of the isolation film during the manufacturing process can be reduced, and the yield of the isolation film is improved.

[0013] In some embodiments, the puncture strength of the isolation film is greater than or equal to 50 kgf / cm2. Such a design, by controlling the puncture strength of the isolation film in the range of greater than or equal to 50 kgf / cm2, can also reduce the phenomenon of damage deformation of the isolation film during the manufacturing process, and improve the yield of the isolation film.

[0014] In some embodiments, the thickness of the isolation film is defined as W1, the thickness of the insulating sheet is defined as W2, and the thickness of the bottom support sheet of the battery device is defined as W3, and W3> W2> W1 is satisfied. Such a design, by making the thickness of the isolation film less than the thickness of the insulating sheet, can reduce the influence of the isolation film on the overall height of the electrode assembly, and avoid interference between the top of the electrode assembly and the cover of the shell. In addition, by making the thickness of the bottom support sheet greater than the thickness of the insulating sheet, the insulating sheet can be effectively supported by the bottom support sheet, and the protection effect of the bottom of the electrode assembly can be improved.

[0015] In some embodiments, the insulating bottom sheet is provided with a plurality of first infiltration holes distributed at intervals, the bottom support sheet of the battery device is provided with a plurality of second infiltration holes distributed at intervals, and the plurality of first infiltration holes and the plurality of second infiltration holes correspond one-to-one. Such a design, the design of the plurality of first infiltration holes and the plurality of second infiltration holes can improve the area of upward migration of the electrolyte, and when the electrolyte in the shell passes through the isolation film, the electrolyte in the shell can migrate upward through the isolation film, the plurality of first infiltration holes and the plurality of second infiltration holes, so as to be efficiently absorbed by the electrode assembly.

[0016] In some embodiments, the insulation sheet further comprises two insulation large faces, two first insulation side edges and two second insulation side edges; the two insulation large faces are respectively connected to opposite sides of the insulation bottom sheet and respectively wrap the two large side faces of the electrode assembly; the two first insulation side edges are respectively connected to opposite sides of one of the two insulation large faces; the two second insulation side edges are respectively connected to opposite sides of the other of the two insulation large faces; one of the first insulation side edge and one of the second insulation side edge on the same side at least partially overlap and wrap one of the small side faces of the electrode assembly; the other of the first insulation side edge and the other of the second insulation side edge on the same side at least partially overlap and wrap the other of the small side faces of the electrode assembly. In this way, when the insulation sheet is wrapped around the electrode assembly, the bottom of the electrode assembly can be placed on the top surface of the insulation bottom sheet first, so that the bottom of the electrode assembly is wrapped by the insulation bottom sheet; then the two insulation large faces are folded upwards, so that the two insulation large faces wrap the two large side faces of the electrode assembly; then one of the first insulation side edge and one of the second insulation side edge on the same side are respectively folded forward and backward, so that the first insulation side edge and the second insulation side edge at least partially overlap and wrap one of the small side faces of the electrode assembly; then the other of the first insulation side edge and the other of the second insulation side edge on the same side are respectively folded forward and backward, so that the first insulation side edge and the second insulation side edge at least partially overlap and wrap the other of the small side faces of the electrode assembly. Thus, the bottom surface, the two large side faces and the two small side faces of the electrode assembly can be wrapped by the insulation sheet in the above way, so as to improve the protection effect of the electrode assembly.

[0017] In some embodiments, the battery device further comprises a sticker, the first insulation side edge and the second insulation side edge on the same side at least partially overlap and are pasted with the sticker, and the sticker is pasted on the bottom of the insulation bottom sheet or the bottom of the bottom support sheet of the battery device. In this way, after the insulation sheet is wrapped around the electrode assembly, at least one sticker is pasted on the first insulation side edge and the second insulation side edge on one side at least partially overlap and on the bottom of the insulation bottom sheet or the bottom of the bottom support sheet, and at least one sticker is pasted on the first insulation side edge and the second insulation side edge on the other side at least partially overlap and on the bottom of the insulation bottom sheet or the bottom of the bottom support sheet, so as to improve the wrapping effect of the insulation sheet on the electrode assembly.

[0018] The application also provides a battery device.

[0019] The above description is only a summary of the technical solutions of the application. In order to make the technical solutions of the application more clear, the application can be implemented according to the content of the description, and in order to make other purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from the structures shown in the drawings without creative labor.

[0021] Figure 1 Structure schematic diagram of an embodiment of the vehicle of the present application;

[0022] Figure 2 Exploded view of an embodiment of the battery device of the present application;

[0023] Figure 3 Assembly schematic diagram of an embodiment of the battery device of the present application;

[0024] Figure 4 Schematic diagram of cooperation between the isolation film and the insulating sheet in an embodiment of the battery device of the present application;

[0025] Figure 5 Assembly schematic diagram of another embodiment of the battery device of the present application;

[0026] Figure 6 Schematic diagram of cooperation between the isolation film and the bottom support sheet in another embodiment of the battery device of the present application;

[0027] Figure 7 Assembly schematic diagram of still another embodiment of the battery device of the present application;

[0028] Figure 8 Schematic diagram of cooperation between the isolation film and the outer shell in still another embodiment of the battery device of the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030]

[0031] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0032] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," "having" and "with" in the specification and claims, along with their derivatives, are meant to be interpreted as specifying inclusion of the referenced elements, but not exclusion of any other elements.

[0034] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0035] Reference herein to "an embodiment" 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 appearance of the phrase in various places in the specification is not necessarily all referring to the same embodiment, or to a particular embodiment, or to a particular set of embodiments, and is not intended to exclude any other embodiments or aspects of the application. It will be explicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0036] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0037] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as limiting the embodiments of the present application, which do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0038] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication or interaction relationship between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0039] Battery devices referred to in the art are also called batteries, which can be classified as primary batteries and secondary batteries depending on whether they can be recharged. Currently common types of secondary batteries include lead-acid batteries, nickel-hydrogen batteries, and lithium-ion batteries. Lithium-ion batteries are currently widely used in pure electric vehicles and hybrid vehicles. Lithium-ion batteries used for such purposes have relatively low capacity, but have large output, charging current, and long service life, but are relatively expensive.

[0040] The batteries described in the embodiments of the present application refer to secondary batteries. In the following, embodiments disclosed in the present application will be described mainly with lithium-ion batteries as examples. It should be understood that embodiments disclosed in the present application are applicable to any other appropriate type of secondary battery. The batteries referred to in the embodiments disclosed in the present application can be directly or indirectly applied to appropriate devices to power the devices.

[0041] The batteries referred to in the embodiments disclosed in the present application refer to single physical modules including one or more cells to provide predetermined voltage and capacity. A cell is a basic unit in a battery, which can be generally classified into cylindrical cells, cuboid cells, and pouch cells in terms of packaging. In the following, embodiments will be mainly described around cuboid cells. It should be understood that embodiments described in the following are also applicable to cylindrical cells or pouch cells in some aspects.

[0042] A cell includes a positive electrode tab, a negative electrode tab, an electrolyte, and a separator. A lithium-ion cell mainly works by moving lithium ions between the positive electrode tab and the negative electrode tab. In a cylindrical cell, a thin film structure of three layers is wound into a cylindrical electrode assembly, while in a cuboid cell, the thin film structure is wound or stacked into an electrode assembly having a generally cuboid shape.

[0043] In a general cell structure, a cell includes a housing, an electrode assembly, and an electrolyte. The electrode assembly is accommodated in the housing of the cell, and the electrode assembly includes a positive electrode tab, a negative electrode tab, and a separator. The housing includes a receiving cavity formed by a plurality of walls and an opening. The cover is arranged at the opening to close the receiving cavity. In addition to the electrode assembly, the receiving cavity also accommodates the electrolyte. The positive electrode tab and the negative electrode tab in the electrode assembly include tabs. In order to avoid fusing by a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The tabs are electrically connected to electrode terminals located outside the cell through connecting members. The electrode terminals generally include a positive electrode terminal and a negative electrode terminal. For cuboid cells, the electrode terminals are generally provided in the cover portion. A plurality of cells are connected in series and / or parallel together via the electrode terminals to be applied to various application occasions.

[0044] In high-power applications such as electric vehicles, batteries are used at three levels: cells, modules, and batteries. A battery module is a system that electrically connects a number of cells and houses them in a frame to protect them from external shock, heat, and vibration. A battery is the final battery system installed in an electric vehicle. A battery typically consists of a housing that encloses one or more cells.

[0045] New energy vehicles have experienced rapid growth in recent years. Within the electric vehicle sector, power batteries, as the power source, play an irreplaceable and crucial role. A battery consists of a casing and multiple cells housed within it. As a core component of new energy vehicles, batteries have high safety requirements. Currently, the mechanical safety of power batteries during use is a common concern for consumers.

[0046] The battery provided in the embodiments of the present application can be a power source for electrical devices. Electrical devices can include mobile phones, portable devices, laptop computers, battery-powered vehicles, electric vehicles, ships, spacecraft, electric toys, and electric tools. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0047] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0048] For example, Figure 1As shown in FIG. 1, a schematic structural diagram of an embodiment of a vehicle 1000 is shown. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle. The vehicle 1000 can be provided with a battery device 100, a controller 200, and a motor 300. The controller 200 is configured to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front, or the rear of the vehicle 1000. The battery device 100 can be configured to supply power to the vehicle 1000. For example, the battery device 100 can be configured as an operating power source of the vehicle 1000, and can be configured to supply power to the circuit system of the vehicle 1000, for example, to meet the power demand of the vehicle 1000 during starting, navigation, and operation. In another embodiment of the present application, the battery device 100 can be configured as an operating power source of the vehicle 1000, and can be configured to replace or partially replace fuel or natural gas to provide driving power to the vehicle 1000.

[0049] For example, refer to Figure 2 , Figure 2 As shown in FIG. 2, an exploded view of an embodiment of the battery device 100 is shown. The battery device 100 includes a battery box 1 and a battery cell 2. The battery box 1 has a receiving space for receiving the battery cell 2. The battery box 1 can have various structures. In some embodiments, the battery box 1 can include a first part 10a and a second part 10b. The first part 10a and the second part 10b are coupled to each other to define a receiving space for receiving the battery cell 2. The second part 10b can be a hollow structure with one end open. The first part 10a can be a plate structure. The first part 10a is coupled to the open end of the second part 10b to define the receiving space together with the second part 10b. Alternatively, the first part 10a and the second part 10b can both be hollow structures with one end open. The open end of the first part 10a is coupled to the open end of the second part 10b. Of course, the housing 11 formed by the first part 10a and the second part 10b can have various shapes, such as a cylinder or a cuboid.

[0050] In the battery device 100, the battery cell 2 can be one or a plurality of battery cells. When the battery device 100 has a plurality of battery cells 2, the plurality of battery cells 2 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 2 are connected in series and in parallel. The plurality of battery cells 2 can be directly connected in series, in parallel, or in a mixed connection. The plurality of battery cells 2 are received in the battery box 1. Alternatively, the plurality of battery cells 2 can be connected in series, in parallel, or in a mixed connection to form a battery module. A plurality of battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and are received in the battery box 1.

[0051] The battery device generally comprises an electrode assembly and an aluminum shell, which is the shell of the battery. In order to prevent the aluminum shell from being scratched due to interference when the electrode assembly is placed into the shell, a soft plastic sheet, which can be called a mylar sheet or an insulating sheet, is wrapped around the electrode assembly before the electrode assembly is placed into the shell. Meanwhile, a hard plastic sheet, which is called a bottom support sheet, is compounded at the bottom of the insulating sheet to further protect the bottom of the electrode assembly. In addition, the insulating sheet and the bottom support sheet are both provided with neat and corresponding infiltration holes for passing electrolyte, so that the electrolyte accumulated at the bottom of the aluminum shell can quickly migrate upward through the infiltration holes and be efficiently absorbed by the electrode assembly in the high-temperature infiltration process. However, the bottom of the electrode assembly is prone to interference and collision due to frequent transfer on the logistics line or non-standard handling by personnel, which may cause the anode sheet to be decarburized and powder to fall off. If the falling carbon powder or anode sheet burr is connected with the aluminum shell through the infiltration holes on the insulating sheet and the bottom support sheet, the aluminum shell may be corroded and the liquid may leak.

[0052] In the related art, in order to solve the risk of corrosion and leakage of the aluminum shell caused by the above-mentioned connection, the infiltration holes on the bottom support sheet and the insulating sheet are generally cancelled, and only two holes on the left and right sides for assembly positioning are reserved. After the electrode assembly is assembled with the insulating sheet and the bottom support sheet, a layer of blue glue is fixed to the insulating sheet in the middle of the left and right two right-angle edges, and covers the assembly positioning holes. However, the electrolyte accumulated at the bottom of the aluminum shell can only migrate upward through the gap between the left and right sides of the insulating sheet and the bottom support sheet, which results in low migration efficiency of the electrolyte, and the electrolyte is difficult to be absorbed by the electrode assembly, thereby causing the problem of poor electrolyte infiltration and the phenomenon of black spot segregation at the interface.

[0053] Based on the above problems, the present application provides a battery device 100, which aims to block the falling of carbon powder and effectively absorb electrolyte to improve the infiltration effect, so as to improve the phenomenon of black spot segregation at the interface caused by poor electrolyte infiltration. The following will be described in detail in combination with specific drawings and embodiments.

[0054] Please refer to Figures 3 to 6 In an embodiment of the present application, the battery device 100 comprises a battery box 1 and a battery cell 2, and the battery cell 2 is arranged in the battery box 1; the battery cell 2 comprises a shell 10, an electrode assembly 20, an insulating sheet 30 and a separation film 40; the electrode assembly 20 is arranged in the shell 10; the insulating sheet 30 is wrapped around the electrode assembly 20, and the insulating sheet 30 has an insulating bottom sheet 31 wrapped around the bottom of the electrode assembly 20, and the insulating bottom sheet 31 is provided with a first infiltration hole 311; the separation film 40 is arranged between the bottom of the electrode assembly 20 and the inner bottom wall of the shell 10, and covers the first infiltration hole 311, and the separation film 40 is configured to isolate the conductive material falling from the electrode assembly 20 and configured to pass through the electrolyte.

[0055] The shell 10 has a containing space for containing the electrode assembly 20. The shell 10 can have various structures. In some embodiments, the shell 10 can include a bottom shell 11 and a cover 12, where the bottom shell 11 can correspond to a first part of the shell 10, the cover 12 can correspond to a second part of the shell 10, and the bottom shell 11 and the cover 12 together define the containing space for containing the electrode assembly 20. The bottom shell 11 can be a hollow structure with one end open, and the cover 12 can be a plate-shaped structure that covers the open side of the bottom shell 11, so that the bottom shell 11 and the cover 12 together define the containing space. Of course, the shell 10 formed by the bottom shell 11 and the cover 12 can have various shapes, such as a cylinder, a cuboid, etc.

[0056] The insulating sheet 30 is used to prevent scratches caused by interference between the electrode assembly 20 and the shell 10 during assembly, and wraps the outer surface of the electrode assembly 20. The insulating sheet 30 can wrap all surfaces of the electrode assembly 20, or can wrap all surfaces of the electrode assembly 20 except the surface where the tab is provided. When the insulating sheet 30 wraps all surfaces of the electrode assembly 20, the insulating sheet 30 needs to avoid the position where the electrode assembly 20 has the tab, so that the tab of the electrode assembly 20 can pass through the insulating sheet 30 and be connected to the outside smoothly. The material of the insulating sheet 30 can be insulating glue, insulating paper, insulating fiber, etc. In some embodiments, the insulating sheet 30 can be a soft plastic sheet, so that the insulating sheet 30 can be bent to wrap the electrode assembly 20 smoothly, such as nylon, polytetrafluoroethylene, polyethylene terephthalate, polyurethane, etc.

[0057] The isolation film 40 is a material that is dense and can allow electrolyte to pass through, which can block solids and allow liquids to pass through. The isolation film 40 is arranged between the bottom of the electrode assembly 20 and the inner bottom wall of the shell 10, which can effectively isolate the conductive materials such as carbon powder that fall from the electrode assembly 20, so as to avoid the conductive materials such as carbon powder that fall from the electrode assembly 20 from falling onto the inner bottom wall of the shell 10 through the first infiltration hole 311; at the same time, the electrolyte in the shell 10 can also pass through the isolation film 40, so that the electrolyte in the shell 10 can migrate upward through the isolation film 40 and the first infiltration hole 311 to be efficiently absorbed by the electrode assembly 20. The isolation film 40 can be arranged at the bottom of the electrode assembly 20, or at the top surface or bottom surface of the insulating sheet 30, or at the inner bottom wall of the shell 10, etc. The material of the isolation film 40 can be a film material made of plastic film, fiber film, etc., such as polyethylene (PE) film, polypropylene (PP) film, etc.

[0058] In summary, in the technical scheme of the embodiment of the application, the isolation film 40 is additionally arranged between the bottom of the electrode assembly 20 and the inner bottom wall of the shell 10, and the isolation film 40 covers the first infiltration hole 311 of the insulating sheet 30. The conductive material such as carbon powder falling from the electrode assembly 20 can be effectively isolated by the isolation film 40, so as to avoid the conductive material such as carbon powder falling from the electrode assembly 20 from falling onto the inner bottom wall of the shell 10 through the first infiltration hole 311, thereby playing a role of blocking the carbon powder from falling off. Meanwhile, the electrolyte in the shell 10 can also pass through the isolation film 40, so that the electrolyte in the shell 10 can migrate upward through the isolation film 40 and the first infiltration hole 311, and be efficiently absorbed by the electrode assembly 20. Therefore, by means of additionally arranging the isolation film 40 between the bottom of the electrode assembly 20 and the inner bottom wall of the shell 10, the effects of both blocking the carbon powder from falling off and effectively absorbing the electrolyte to improve the infiltration effect are achieved, so as to improve the phenomenon of interface black spot analysis caused by poor electrolyte infiltration.

[0059] In addition, when the insulating sheet 30 is used to wrap the electrode assembly 20, the insulating sheet 30 has a connecting gap on both sides, and the electrolyte in the shell 10 can also migrate upward through the connecting gap on both sides of the insulating sheet 30, and in combination with the electrolyte migrating upward through the isolation film 40 and the first infiltration hole 311, so that the electrode assembly 20 can further efficiently absorb the electrolyte, so that the electrolyte can fully infiltrate the electrode assembly 20.

[0060] Please refer to Figure 3 , Figure 4 In an embodiment of the application, the isolation film 40 is arranged on the top surface or the bottom surface of the insulating bottom sheet 31.

[0061] The top surface of the insulating bottom sheet 31 refers to the side surface of the insulating bottom sheet 31 close to the electrode assembly 20, and the bottom surface of the insulating bottom sheet 31 refers to the side surface of the insulating bottom sheet 31 close to the inner bottom wall of the shell 10. The isolation film 40 is compounded and processed on the top surface or the bottom surface of the insulating bottom sheet 31. The isolation film 40 can be processed on the insulating bottom sheet 31 by means of heat melting or gluing and the like during the preparation process of the insulating bottom sheet 31, or a heat melting or gluing process and the like can be additionally arranged to process the isolation film 40 on the insulating bottom sheet 31 during the assembly process of the battery device 100. In some embodiments, the isolation film 40 can be processed on the insulating bottom sheet 31 by means of heat melting, so as to form a heat melting welding point between the isolation film 40 and the insulating bottom sheet 31. The heat melting welding point needs to avoid the position of the first infiltration hole 311, and can be arranged at the position between adjacent first infiltration holes 311, for example.

[0062] Such a design can reliably fix the isolation film 40 between the bottom of the electrode assembly 20 and the inner bottom wall of the shell 10 by arranging the isolation film 40 on the top surface or the bottom surface of the insulating bottom sheet 31, and then wrapping the electrode assembly 20 with the insulating bottom sheet 31 provided with the isolation film 40.

[0063] Please refer to Figures 3 to 8 In an embodiment of the present application, the battery device 100 further comprises a bottom support sheet 50, which is arranged at the bottom of the insulating bottom sheet 31 and is provided with second infiltration holes 51, and the first infiltration holes 311 and the second infiltration holes 51 are in communication; the isolation film 40 covers the first infiltration holes 311 and the second infiltration holes 51.

[0064] The bottom support sheet 50 is used to strengthen the protection effect on the electrode assembly 20 and is arranged at the bottom of the insulating bottom sheet 31. The material of the bottom support sheet 50 can also be insulating glue, insulating paper, insulating fiber, etc. In some embodiments, the bottom support sheet 50 can be a hard plastic sheet, which can be, for example, polypropylene, polystyrene, polyvinyl chloride, polyethylene, polycarbonate, polyamide, etc.

[0065] Such a design, by adding the bottom support sheet 50 at the bottom of the insulating bottom sheet 31, can support the insulating sheet 30 through the bottom support sheet 50, and at the same time can further protect the bottom of the electrode assembly 20 to improve the protection effect on the electrode assembly 20 and better avoid scratching when the electrode assembly 20 enters the shell. In addition, by providing the second infiltration holes 51 on the bottom support sheet 50 in communication with the first infiltration holes 311 and covering the first infiltration holes 311 and the second infiltration holes 51 with the isolation film 40, when the electrolyte in the shell 10 penetrates through the isolation film 40, the electrolyte in the shell 10 can migrate upward through the isolation film 40, the first infiltration holes 311 and the second infiltration holes 51 to be efficiently absorbed by the electrode assembly 20.

[0066] Please refer to Figure 5 、 Figure 6 In another embodiment of the present application, the isolation film 40 is arranged on the top surface or the bottom surface of the bottom support sheet 50.

[0067] The top surface of the bottom support sheet 50 refers to the side surface of the insulating sheet 30 close to the electrode assembly 20; the bottom surface of the bottom support sheet 50 refers to the side surface of the insulating sheet 30 close to the inner bottom wall of the shell 10. The isolation film 40 is compounded and processed on the top surface or the bottom surface of the bottom support sheet 50, which can be processed on the bottom support sheet 50 through hot melting or gluing process during the preparation process of the bottom support sheet 50, or can be processed on the bottom support sheet 50 by adding a hot melting or gluing process during the assembly process of the battery device 100. In some embodiments, the isolation film 40 can be processed on the bottom support sheet 50 by hot melting to form hot melting welding points between the isolation film 40 and the bottom support sheet 50, and the hot melting welding points need to avoid the positions of the second infiltration holes 51, for example, can be arranged between the adjacent second infiltration holes 51.

[0068] Such a design, by setting the isolation film 40 on the top surface or bottom surface of the bottom supporting sheet 50, and then setting the bottom supporting sheet 50 provided with the isolation film 40 on the bottom of the insulating bottom sheet 31, can also reliably fix the isolation film 40 between the bottom of the electrode assembly 20 and the inner bottom wall of the shell 10.

[0069] In some embodiments, the isolation film 40 can be set on the top surface of the bottom supporting sheet 50 or the bottom surface of the insulating bottom sheet 31, so that the isolation film 40 forms a sandwich between the bottom supporting sheet 50 and the insulating bottom sheet 31, to protect the isolation film 40 by the bottom supporting sheet 50 and the insulating bottom sheet 31.

[0070] Please refer to Figure 7 , Figure 8 In another embodiment of the present application, the isolation film 40 is provided on the inner bottom wall of the shell 10.

[0071] Such a design, by directly setting the isolation film 40 on the inner bottom wall of the shell 10, can also reliably fix the isolation film 40 between the bottom of the electrode assembly 20 and the inner bottom wall of the shell 10.

[0072] Please refer to Figures 3 to 8 In an embodiment of the present application, the porosity of the isolation film 40 is 40% to 60%.

[0073] It should be noted that, from a microscopic structure, the isolation film 40 is a porous structure, and the position of the pores can allow the electrolyte to pass through, while being a dense structure that can effectively block the conductive material such as carbon powder dropped by the electrode assembly 20 from passing through. The porosity refers to the proportion of pores in the material. For a unit area of the isolation film 40, the higher the porosity, the more pores are provided.

[0074] Such a design, by controlling the porosity of the isolation film 40 to be between 40% and 60%, can help to improve the ion conductivity and electrolyte wettability, so that enough electrolyte can pass through the isolation film 40 and be efficiently absorbed by the electrode assembly 20; at the same time, it can avoid that the porosity is too high to affect the film-forming property of the isolation film 40.

[0075] As some examples, the porosity of the isolation film 40 can be 40%, 42%, 45%, 48%, 50%, 53%, 55%, 57%, 60%, and the like.

[0076] Please refer to Figures 3 to 8 In an embodiment of the present application, the pore of the isolation film 40 is less than 10 um.

[0077] The pore refers to the size of the hole in the isolation film 40.

[0078] Such a design, by making the aperture of the isolation film 40 less than 10 um, can avoid the conductive material such as carbon powder dropped by the electrode assembly 20 from passing through the hole on the isolation film 40, so that the isolation film 40 can effectively block the conductive material such as carbon powder dropped by the electrode assembly 20.

[0079] As some examples, the aperture of the isolation film 40 can be 9 um, 8 um, 7 um, 6 um, 5 um, 4 um, 3 um, 2 um, 1 um, etc.

[0080] Please refer to Figures 3 to 8 In an embodiment of the present application, the tensile strength of the isolation film 40 is ≥ 500 kgf / cm2.

[0081] Tensile strength refers to the maximum stress that a material can withstand before tensile fracture. Tensile strength is an important indicator of the mechanical properties of a material, which reflects the ability of the material to resist damage under tensile force.

[0082] Such a design, by controlling the tensile strength of the isolation film 40 in the range of greater than or equal to 500 kgf / cm2, can reduce the phenomenon of damage and deformation of the isolation film 40 during the manufacturing process, and improve the yield of the isolation film 40.

[0083] As some examples, the tensile strength of the isolation film 40 can be 500 kgf / cm2, 510 kgf / cm2, 520 kgf / cm2, 530 kgf / cm2, 540 kgf / cm2, 550 kgf / cm2, 560 kgf / cm2, 570 kgf / cm2, 580 kgf / cm2, etc.

[0084] Please refer to Figures 3 to 8 In an embodiment of the present application, the penetration strength of the isolation film 40 is ≥ 50 kgf / cm2.

[0085] Penetration strength refers to the force required to pierce the isolation film 40 with a professional experiment, which can reflect the ability of the isolation film 40 to resist penetration by blunt objects.

[0086] Such a design, by controlling the penetration strength of the isolation film 40 in the range of greater than or equal to 50 kgf / cm2, can also reduce the phenomenon of damage and deformation of the isolation film 40 during the manufacturing process, and improve the yield of the isolation film 40.

[0087] As some examples, the penetration strength of the isolation film 40 can be 50 kgf / cm2, 51 kgf / cm2, 52 kgf / cm2, 53 kgf / cm2, 54 kgf / cm2, 55 kgf / cm2, 56 kgf / cm2, 57 kgf / cm2, 58 kgf / cm2, etc.

[0088] Please refer to Figures 3 to 8 In an embodiment of the present application, the thickness of the isolation film 40 is defined as W1, the thickness of the insulating sheet 30 is defined as W2, and the thickness of the bottom support sheet 50 of the battery device 100 is defined as W3, which satisfies: W3>W2>W1.

[0089] Such a design can reduce the influence of the isolation film 40 on the overall height of the electrode assembly 20 by making the thickness of the isolation film 40 less than the thickness of the insulating sheet 30, thereby avoiding interference between the top of the electrode assembly 20 and the cover 12 of the shell 10. In addition, by making the thickness of the bottom support sheet 50 greater than the thickness of the insulating sheet 30, the insulating effect can be effectively supported by the bottom support sheet 50, thereby improving the protection effect on the bottom of the electrode assembly 20.

[0090] Please refer to Figures 3 to 8 In an embodiment of the present application, the insulating bottom sheet 31 is provided with a plurality of first infiltration holes 311 distributed at intervals, and the bottom support sheet 50 of the battery device 100 is provided with a plurality of second infiltration holes 51 distributed at intervals, and the plurality of first infiltration holes 311 and the plurality of second infiltration holes 51 correspond one-to-one.

[0091] Such a design can improve the area of upward migration of the electrolyte. When the electrolyte in the shell 10 passes through the isolation film 40, the electrolyte in the shell 10 can migrate upward through the isolation film 40, the plurality of first infiltration holes 311, and the plurality of second infiltration holes 51 to be efficiently absorbed by the electrode assembly 20.

[0092] In actual application, the arrangement of the plurality of first infiltration holes 311 and the plurality of second infiltration holes 51 has multiple modes. For example, the plurality of first infiltration holes 311 can be distributed at intervals along the length or width of the insulating bottom sheet 31, and the plurality of second infiltration holes 51 can be distributed at intervals along the length or width of the bottom support sheet 50. Alternatively, the plurality of first infiltration holes 311 can be arrayed on the insulating bottom sheet 31, and the plurality of second infiltration holes 51 can be arrayed on the bottom support sheet 50. The number and size of the first infiltration holes 311 and the second infiltration holes 51 are not specifically limited here and can be determined according to actual use requirements.

[0093] Please refer to Figures 3 to 5 、 Figure 7In an embodiment of the present application, the insulation sheet 30 further comprises two insulation large surfaces 32, two first insulation side edges 33 and two second insulation side edges 34; the two insulation large surfaces 32 are respectively connected to the opposite sides of the insulation bottom sheet 31 and respectively wrap the two large side surfaces of the electrode assembly 20; the two first insulation side edges 33 are respectively connected to the opposite sides of one of the two insulation large surfaces 32; the two second insulation side edges 34 are respectively connected to the opposite sides of the other of the two insulation large surfaces 32; wherein one of the first insulation side edge 33 and one of the second insulation side edge 34 on the same side at least partially overlap and wrap one of the small side surfaces of the electrode assembly 20; the other of the first insulation side edge 33 and the other of the second insulation side edge 34 on the same side at least partially overlap and wrap the other of the small side surfaces of the electrode assembly 20.

[0094] The insulation sheet 30 comprises the insulation bottom sheet 31, the two insulation large surfaces 32, the two first insulation side edges 33 and the two second insulation side edges 34; the insulation sheet 30 in the unfolded state, which refers to the state before wrapping the electrode assembly 20, can be in the shape of an I-beam, as shown in Figure 4 .

[0095] With such a design, when the insulation sheet 30 is used to wrap the electrode assembly 20, the bottom of the electrode assembly 20 can be first placed on the top surface of the insulation bottom sheet 31 so as to wrap the bottom of the electrode assembly 20 by the insulation bottom sheet 31; then the two insulation large surfaces 32 are folded upwards so as to wrap the two large side surfaces of the electrode assembly 20 by the two insulation large surfaces 32; then one of the first insulation side edge 33 and one of the second insulation side edge 34 on the same side are respectively folded forward and backward so as to at least partially overlap and wrap one of the small side surfaces of the electrode assembly 20 by the first insulation side edge 33 and the second insulation side edge 34; then the other of the first insulation side edge 33 and the other of the second insulation side edge 34 on the same side are respectively folded forward and backward so as to at least partially overlap and wrap the other of the small side surfaces of the electrode assembly 20 by the first insulation side edge 33 and the second insulation side edge 34. Therefore, the bottom surface, the two large side surfaces and the two small side surfaces of the electrode assembly 20 can be wrapped by the insulation sheet 30 in the above manner, so as to improve the protection effect on the electrode assembly 20.

[0096] Please refer to Figures 3 to 5 、 Figure 7 In an embodiment of the present application, the battery device 100 further comprises a sticker 30, which is attached to the overlapping part of the first insulation side edge 33 and the second insulation side edge 34 on the same side and is also attached to the bottom of the insulation bottom sheet 31 or the bottom of the bottom support sheet 50 of the battery device 100.

[0097] The adhesive sheet 30 is used to adhere to the overlapping position of the first and second insulating side edges 33 and 34 on the same side, and to the bottom of the insulating bottom sheet 31 or the bottom of the bottom support sheet 50. For example, when the bottom of the insulating bottom sheet 31 is not provided with the bottom support sheet 50, the adhesive sheet 30 is partially adhered to the bottom of the insulating bottom sheet 31; when the bottom of the insulating bottom sheet 31 is provided with the bottom support sheet 50, the adhesive sheet 30 is partially adhered to the bottom of the bottom support sheet 50. The adhesive sheet 30 can be a blue glue or other common adhesive tape. It should be noted that the blue glue refers to the mala adhesive tape among the lithium battery special adhesive tapes.

[0098] Such design, after the insulating sheet 30 is wrapped around the electrode assembly 20, at least one adhesive sheet 30 is used to adhere to the overlapping position of the first and second insulating side edges 33 and 34 on one side, and to the bottom of the insulating bottom sheet 31 or the bottom of the bottom support sheet 50, and at least one adhesive sheet 30 is used to adhere to the overlapping position of the first and second insulating side edges 33 and 34 on the other side, and to the bottom of the insulating bottom sheet 31 or the bottom of the bottom support sheet 50, so as to improve the wrapping effect of the insulating sheet 30 on the electrode assembly 20.

[0099] According to some embodiments of the present application, the present application provides a battery device 100, please refer to Figures 3 to 8 The battery device 100 includes a battery box 1 and a battery cell 2, the battery cell 2 is arranged in the battery box 1; the battery cell 2 includes a shell 10, an electrode assembly 20, an insulating sheet 30, a bottom support sheet 50 and a separator 40; the insulating sheet 30 is wrapped around the electrode assembly 20, the insulating sheet 30 has an insulating bottom sheet 31 wrapped around the bottom of the electrode assembly 20, the insulating bottom sheet 31 is provided with a first infiltration hole 311; the bottom support sheet 50 is arranged at the bottom of the insulating bottom sheet 31 and is provided with a second infiltration hole 51, the first infiltration hole 311 corresponds to the second infiltration hole 51; the separator 40 is arranged between the insulating bottom sheet 31 and the bottom support sheet 50, and covers the first and second infiltration holes 311 and 51.

[0100] The separator 40 is configured to isolate the conductive material dropped by the electrode assembly 20, and is configured to pass through the electrolyte.

[0101] In the technical scheme of the embodiment, the technical scheme of the application adds the isolation film 40 between the insulating sheet 30 and the bottom support sheet 50, so that the isolation film 40 is located between the bottom of the electrode assembly 20 and the inner bottom wall of the shell 10, and the isolation film 40 covers the first infiltration hole 311 of the insulating sheet 30 and the second infiltration hole 51 of the bottom support sheet 50. The conductive material such as carbon powder falling from the electrode assembly 20 can be effectively isolated by the isolation film 40, so as to avoid the conductive material such as carbon powder falling from the electrode assembly 20 from falling onto the inner bottom wall of the shell 10 through the first infiltration hole 311 and the second infiltration hole 51, so as to play a role in blocking the falling of carbon powder. At the same time, the electrolyte in the shell 10 can also pass through the isolation film 40, so that the electrolyte in the shell 10 can migrate upward through the isolation film 40, the first infiltration hole 311 and the second infiltration hole 51, so as to be efficiently absorbed by the electrode assembly 20. Therefore, the present scheme can block the falling of carbon powder and effectively absorb the electrolyte to improve the infiltration effect, so as to improve the phenomenon of black spot analysis caused by poor electrolyte infiltration. In addition, by adding the bottom support sheet 50 at the bottom of the insulating bottom sheet 31, the insulating sheet 30 can be supported by the bottom support sheet 50, and the bottom of the electrode assembly 20 can be further protected, so as to improve the protection effect of the electrode assembly 20 and better avoid scratching when the electrode assembly 20 enters the shell. Furthermore, by arranging the isolation film 40 between the insulating sheet 30 and the bottom support sheet 50, the isolation film 40 can be formed as a layer between the bottom support sheet 50 and the insulating bottom sheet 31, so as to be protected by the bottom support sheet 50 and the insulating bottom sheet 31.

[0102] The application also provides a kind of electric equipment, and the electric equipment includes battery device 100, and the specific structure of the battery device 100 refers to the above embodiment, since the above all technical schemes of all embodiments are used in the electric equipment, at least all beneficial effects brought by the technical scheme of the above embodiment are had, which will not be repeated here.

[0103] The above is only an exemplary embodiment of the application, and does not limit the patent scope of the application, and any equivalent structural transformation made by using the contents of the application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A battery device, characterized in that: The battery comprises a battery box and a battery cell, wherein the battery cell is arranged in the battery box and comprises: shell; an electrode assembly, disposed in the housing; an insulating sheet wrapped around the electrode assembly, the insulating sheet comprising an insulating bottom sheet wrapped around the bottom of the electrode assembly, the insulating bottom sheet being provided with a first wetting hole; The isolation membrane is provided between the bottom of the electrode assembly and the inner bottom wall of the shell and covers the first wetting hole. The isolation membrane is configured to isolate the conductive material dropped from the electrode assembly and is configured to allow the electrolyte to pass through.

2. The battery device according to claim 1, wherein: The isolation film is arranged on the top surface or the bottom surface of the insulating bottom sheet.

3. The battery device according to claim 1, wherein: The battery device further includes a bottom supporting sheet, which is disposed at the bottom of the insulating bottom sheet and is provided with a second wetting hole, wherein the first wetting hole is connected to the second wetting hole; the isolation membrane covers the first wetting hole and the second wetting hole.

4. The battery device according to claim 3, wherein: The isolation film is arranged on the top surface or the bottom surface of the bottom supporting sheet.

5. The battery device according to claim 1, wherein: The isolation membrane is arranged on the inner bottom wall of the shell.

6. The battery device according to any one of claims 1 to 5, characterized in that The porosity of the isolation membrane is 40% to 60%; and / or, the pores of the isolation membrane are less than 10 μm; and / or, the tensile strength of the isolation film is ≥500 kgf / cm2; And / or, the isolation film has a puncture strength of ≥50 kgf / cm2.

7. The battery device according to any one of claims 1 to 5, characterized in that The thickness of the isolation film is defined as W1, the thickness of the insulating sheet is defined as W2, and the thickness of the bottom support sheet of the battery device is defined as W3, and the following conditions are satisfied: W3>W2>W1.

8. The battery device according to any one of claims 1 to 5, characterized in that The insulating bottom sheet is provided with a plurality of first wetting holes distributed at intervals, and the bottom supporting sheet of the battery device is provided with a plurality of second wetting holes distributed at intervals, and the plurality of first wetting holes corresponds to the plurality of second wetting holes in a one-to-one manner.

9. The battery device according to any one of claims 1 to 5, characterized in that The insulating sheet further comprises: Two large insulating surfaces are respectively connected to two opposite sides of the insulating bottom sheet and respectively wrapped around two large side surfaces of the electrode assembly; Two first insulating side edges are respectively connected to two opposite sides of one of the insulating large surfaces; Two second insulating side edges are respectively connected to two opposite sides of the other insulating large surface; In which, a first insulating side edge and a second insulating side edge located on the same side at least partially overlap and are wrapped around one of the small side edges of the electrode assembly; another first insulating side edge and another second insulating side edge located on the same side at least partially overlap and are wrapped around another small side edge of the electrode assembly.

10. The battery device according to claim 9, wherein: The battery device further includes an adhesive sheet, which is adhered to the overlapping portion of the first insulating side and the second insulating side on the same side, and is also adhered to the bottom of the insulating bottom sheet or the bottom of the bottom support sheet of the battery device.

11. An electrical device, characterized in that: A battery device comprising the battery device according to any one of claims 1 to 10.

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