Battery monomer, battery, electric equipment and pole piece gluing equipment

Abstract

The embodiment of the invention provides a battery monomer, a battery, electric equipment and pole piece gluing equipment, and belongs to the technical field of batteries. The battery monomer comprises a shell and an electrode assembly arranged in the shell, the electrode assembly comprises a positive pole piece, a negative pole piece and a solid electrolyte layer, the positive pole piece and the negative pole piece are laminated along a first direction, and the solid electrolyte layer is arranged between the positive pole piece and the negative pole piece; the positive pole piece comprises a positive current collector and a positive active material layer, the positive current collector comprises a coating area and a first empty foil area, the positive active material layer is arranged on the surface of the coating area, the positive active material layer is not arranged on the surface of the first empty foil area, and the first empty foil area is arranged on at least one side of the coating area in the second direction; the second direction is perpendicular to the first direction; wherein the positive pole piece further comprises a first insulating part, and the first insulating part wraps the first empty foil area, so that when the positive pole piece and the negative pole piece are laminated and staggered, the possibility of end face lap joint short circuit caused by bending at the staggered position is reduced, and the reliability of the single battery is improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In battery technology, the reliability of battery cells is an issue that cannot be ignored. Therefore, how to improve the reliability of battery cells is a technical problem that needs to be solved urgently in battery technology. Summary of the invention

[0004] In view of the above problems, the present application provides a battery cell, a battery, an electrical device and a pole piece glue coating device, which are used to wrap the empty foil area of ​​the positive electrode collector, thereby improving the reliability of the battery cell.

[0005] In a first aspect, the present application provides a battery cell, comprising: Housing; and An electrode assembly is disposed in the housing, the electrode assembly is a laminated structure, the electrode assembly comprises a positive electrode sheet, a negative electrode sheet and a solid electrolyte layer, the positive electrode sheet and the negative electrode sheet are stacked along a first direction, and the solid electrolyte layer is disposed between the positive electrode sheet and the negative electrode sheet; The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode current collector comprises a coating area and a first empty foil area, the surface of the coating area is provided with the positive electrode active material layer, the surface of the first empty foil area is not provided with the positive electrode active material layer, along the second direction, the first empty foil area is provided on at least one side of the coating area, and the second direction is perpendicular to the first direction; Wherein, the positive electrode plate also includes a first insulating member, and the first insulating member wraps the first empty foil area.

[0006] The positive electrode current collector has a first surface and a second surface arranged opposite to each other along the first direction, the positive electrode active material layer is arranged on the first surface and the second surface, and the positive electrode current collector has a first side surface in the second direction, and the first side surface connects the first surface and the second surface; The first insulating member includes a first insulating portion, a second insulating portion and a third insulating portion, the first insulating portion is arranged on the first surface, the second insulating portion is arranged on the second surface, the third insulating portion is arranged on the first side surface, and the third insulating portion connects the first insulating portion and the second insulating portion.

[0007] In the technical solution of the embodiment of the present application, the positive electrode collector has a first surface and a second surface in a first direction, and has a first side surface connecting the first surface and the second surface in a second direction. The edge connected to the first surface and the first side surface, the edge connected to the second surface and the first side surface, and the first side surface constitute the first empty foil area of ​​the positive electrode collector. By arranging a first insulating member in the first empty foil area of ​​the positive electrode collector, and making the three insulating parts of the first insulating member respectively arranged on each surface and the side surface, so that the first insulating member can wrap the entire first empty foil area, when the positive electrode sheet and the negative electrode sheet are misaligned and warm isostatic pressing is performed, the possibility of end face overlap short circuit caused by bending at the misalignment is reduced, thereby improving the reliability of the battery cell, and reducing the design size of the first insulating member, thereby improving the energy density of the battery cell.

[0008] In some embodiments, the thickness of the first insulating portion, the thickness of the second insulating portion, and the thickness of the positive electrode active material layer are equal.

[0009] Since the positive electrode active material layer is arranged on the first surface and the second surface, by making the thickness of the first insulating part, the thickness of the second insulating part and the thickness of the positive electrode active material layer equal, the possibility of difficulty in stacking due to the first insulating part and the second insulating part protruding from the positive electrode active material layer can be reduced, and the possibility of gaps between the insulating part and the solid electrolyte layer due to the first insulating part and the second insulating part being recessed in the positive electrode active material layer can also be reduced.

[0010] In some embodiments, along the second direction, the width of the positive electrode active material layer is smaller than the width of the positive electrode current collector, and the width of the first insulating portion and the width of the second insulating portion are both larger than the width of the third insulating portion.

[0011] The first insulating member is in a "C" shape as a whole, so that each side of the first empty foil area can be wrapped by the first insulating member.

[0012] In some embodiments, along the second direction, a width of the first insulating portion is consistent with a width of the second insulating portion.

[0013] The first insulating portion and the second insulating portion are symmetrically arranged about the positive electrode current collector along the first direction to form a corresponding first insulating member.

[0014] In some embodiments, the negative electrode plate includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is disposed on the surface of the negative electrode current collector; The negative electrode current collector has a second side surface in the second direction, and a side of the third insulating portion facing away from the positive electrode current collector is flush with the second side surface. The negative electrode plate is composed of a negative electrode current collector and a negative electrode active material layer arranged on the surface of the negative electrode current collector. By making the second side surface of the negative electrode current collector flush with the surface of the side of the third insulating part away from the positive electrode current collector, the size of the negative electrode plate can be larger than that of the positive electrode plate, thereby reducing the occurrence of lithium deposition during battery charging. At the same time, the possibility of forming a protruding edge between the negative electrode plate and the first insulating part can be reduced, thereby improving the energy density of the battery cell.

[0015] In some embodiments, along the second direction, the width of the first empty foil area is 0.5 mm-2.5 mm.

[0016] By setting the width of the first empty foil area to 0.5 mm-2.5 mm, such as 0.5 mm, 0.8 mm, 1.2 mm, 1.5 mm or 2 mm, the supporting and insulating protection functions can be better achieved.

[0017] In some embodiments, the first empty foil areas are disposed on both sides of the coating area along the second direction, and the positive electrode plate includes two first insulating members, and the two first insulating members respectively wrap the two first empty foil areas.

[0018] By respectively arranging the first empty foil areas on both sides of the coating area along the second direction, and making each first empty foil area wrapped in the corresponding first insulating member, the two sides of the positive electrode plate can be insulated and protected along the second direction, thereby reducing the possibility of end face overlap short circuit caused by bending at the misaligned position, and improving the reliability of the battery cell.

[0019] In some embodiments, the first insulating member is UV insulating glue.

[0020] The first insulating member is made of UV insulating glue to achieve the insulation and support functions of the first insulating member.

[0021] In some embodiments, the positive electrode current collector includes a main body and a positive electrode tab, the main body includes the coating area and the first empty foil area, the positive electrode tab extends from one end of the main body along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0022] The positive electrode tab is arranged on one side of the main body along the third direction to form a positive electrode current collector.

[0023] In some embodiments, the main body further includes a second empty foil area, the surface of the second empty foil area is not provided with the positive electrode active material layer, and along the third direction, the second empty foil area is provided on at least one side of the coating area; The positive electrode plate also includes a second insulating member, and the second insulating member covers the second empty foil area.

[0024] By arranging a second hollow foil area on at least one side of the main body along the third direction and arranging a second insulating member on the second hollow foil area, the positive electrode sheet can be insulated and protected laterally along the third direction, and the negative electrode sheet can be supported at the same time, thereby improving the reliability of the battery cell.

[0025] In some embodiments, the second empty foil areas are disposed on both sides of the coating area along the third direction, and the positive electrode plate includes two second insulating members, and the two second insulating members respectively cover the two second empty foil areas.

[0026] By providing second empty foil areas on both sides of the main body along the third direction, and providing a second insulating member on each second empty foil area, both sides of the positive electrode sheet can be insulated and protected along the third direction, while supporting the negative electrode sheet, thereby improving the reliability of the battery cell.

[0027] In some embodiments, the second insulating member is adjacent to the first insulating member.

[0028] By placing the second insulating member adjacent to the first insulating member, the second insulating member and the first insulating member can form a continuous insulating structure surrounding the positive electrode active material layer, thereby improving the reliability of the battery cell. In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiment.

[0029] The battery provided in the present application comprises the battery monomer described in any one of the embodiments of the first aspect, and thus has the technical effects described in any one of the embodiments above, which will not be described in detail herein.

[0030] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiment.

[0031] The electrical equipment provided in the present application includes the battery described in any one of the embodiments of the first aspect, and thus has the technical effects described in any one of the embodiments above, which will not be described in detail here.

[0032] In a fourth aspect, the present application provides a pole piece glue coating device, which is used to wrap a first insulating member in a first empty foil area of ​​a positive pole piece of a battery cell in the above embodiment; The electrode glue coating device comprises a glue supply device and a glue coating nozzle, wherein the glue coating nozzle is provided with a first flow channel, a second flow channel and a spray cavity, wherein the outlet of the first flow channel and the outlet of the second flow channel are respectively connected to the spray cavity, and the outlet of the first flow channel and the outlet of the second flow channel are arranged opposite to each other along the first direction; the spray cavity can be used for inserting the first empty foil area of ​​the positive electrode sheet; The glue supply device is used to provide insulating glue to the first flow channel and the second flow channel, so that the insulating glue can be sprayed to the first empty foil area of ​​the positive electrode plate through the first flow channel and the second flow channel to form the first insulating member.

[0033] In the technical solution of the embodiment of the present application, when the first hollow foil area wraps the first insulating member, the first hollow foil area can be at least partially inserted into the spray chamber, and then the insulating glue is provided to the first flow channel and the second flow channel of the glue coating nozzle through the glue supply device, so that the insulating glue can be sprayed to the first hollow foil area through each flow channel, thereby forming the first insulating member. The pole piece glue coating equipment can realize the rapid spraying of the first insulating member and improve the processing efficiency of the battery cell.

[0034] In some embodiments, the glue coating nozzle and the positive electrode plate can slide relative to each other along a third direction; The first direction, the second direction and the third direction are perpendicular to each other.

[0035] By making the glue coating nozzle and the positive electrode plate slide relatively along the third direction, the first empty foil area arranged on the side of the coating area along the second direction is continuously sprayed, thereby improving the processing efficiency of the battery monomer.

[0036] In some embodiments, the first empty foil area is disposed on both sides of the coating area of ​​the positive electrode sheet along the second direction; The two gluing nozzles are provided with two, and the two gluing nozzles are arranged opposite to each other along the second direction; One of the first empty foil areas of the positive electrode plate can be inserted into the spray cavity of one of the glue coating nozzles, and another of the first empty foil areas of the positive electrode plate can be inserted into the spray cavity of another of the glue coating nozzles.

[0037] When first empty foil areas are provided on both sides of the coating area along the second direction, two glue coating nozzles can be provided so that each first empty foil area is sprayed synchronously by the corresponding glue coating nozzle, thereby improving the processing efficiency of the battery cell.

[0038] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and in order to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings: Figure 1 A schematic diagram of the structure of a vehicle in some embodiments of the present application; Figure 2 Schematic diagram of the exploded structure of the battery in some embodiments of the present application; Figure 3 A schematic diagram of the exploded structure of a battery cell in some embodiments of the present application; Figure 4 A schematic diagram of the structure of an electrode assembly in a battery cell in some embodiments of the present application; Figure 5 A schematic diagram of the structure of a positive electrode sheet in a battery cell in some embodiments of the present application; Figure 6 for Figure 5 The enlarged schematic diagram of point A in the middle; Figure 7 This is a schematic diagram of the operation of the pole piece glue coating device in some embodiments of the present application wrapping the first insulating member in the first empty foil area of ​​the battery cell; Figure 8 for Figure 7 The enlarged schematic diagram of point B in the middle; Fig. 9 for Figure 7 A schematic diagram of the operation from another angle; Fig.10 This is a schematic diagram of the structure of the electrode gluing equipment in some embodiments of the present application.

[0040] The reference numerals in the specific implementation manner are as follows: 1000. Vehicles; 100, battery; 200, controller; 300, motor; 10. Box body; 11. First part; 12. Second part; 20. Battery cell; 21. Shell; 211. End cap; 22. Electrode assembly; 221. Positive electrode sheet; 2211. Positive current collector; a. Coating area; b. First empty foil area; c. Second empty foil area; S1. First surface; S2. Second surface; S3. First side; 22111. Main body; 22112. Positive electrode tab; 2212. Positive active material layer; 2213. First insulating member; 22131. First insulating portion; 22132. Second insulating portion; 22133. Third insulating portion; 2214. Second insulating member; 222. Negative electrode sheet; 2221. Negative current collector; 2222. Negative active material layer; S4. Second side; 223. Solid electrolyte layer; 23. Post; 400, glue coating nozzle; 401, first flow channel; 402, second flow channel; 403, spray chamber. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] 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 "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0046] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0047] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0048] At present, from the perspective of market development, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of the application field of power batteries, the market demand is also constantly expanding.

[0049] The inventors of the present invention have noticed that in an electrode assembly, the size of the negative electrode sheet in at least one of the length and width directions is usually larger than that of the positive electrode sheet. Since the overall structural strength of the protruding area of ​​the negative electrode sheet is relatively weak, the protruding area will bend under the action of pressure when the electrode assembly is subjected to warm isostatic pressing. After bending, the protruding area may break at the junction with the normal pressure area, and the burrs generated by the broken edge may pierce the diaphragm; in addition, the protruding area may also cause the overlap of the positive and negative electrode sheets, thereby causing a short circuit between the positive and negative electrode sheets, resulting in a greater safety hazard for the battery.

[0050] In order to reduce the above safety hazards, the applicant has found that an insulating member can be provided at the edge of the positive electrode plate, and the insulating member can wrap the edge of the positive electrode plate to reduce the possibility of end face overlap short circuit caused by bending at the misaligned protrusion, thereby improving the reliability of the battery cell.

[0051] Based on the above considerations, in order to solve the problem of major safety hazards in batteries, a battery cell is designed, in which a first insulating member is arranged in the empty foil area of ​​the positive electrode current collector, and the first insulating member is able to wrap the entire first empty foil area. This can reduce the possibility of end face overlap short circuit caused by bending at the misaligned position when the positive electrode sheet and the negative electrode sheet are stacked and warm isostatic pressing is performed, thereby improving the reliability of the battery cell, reducing the design size of the first insulating member, and improving the energy density of the battery cell.

[0052] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical equipment such as vehicles, ships or aircraft. The power supply system of the electrical equipment can be composed of the battery disclosed in the present application.

[0053] The technical solutions described in the embodiments of the present application are applicable to various battery-powered electrical devices, such as mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0054] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0055] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000, or may be used in the circuit system of the vehicle 1000, for example, for the working power requirements during the startup, navigation and operation of the vehicle 1000.

[0056] The vehicle 1000 may further include a controller 200 and a motor 300 , wherein the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0057] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0058] Please refer to Figure 2 , Figure 2 The exploded view of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is accommodated in the box body 10. The box body 10 is used to provide a accommodating space for the battery cell 20, and the box body 10 can adopt a variety of structures.

[0059] In some embodiments, the box body 10 may include a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 jointly define a storage space for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, the first portion 11 covers the open side of the second portion 12, so that the first portion 11 and the second portion 12 jointly define a storage space; the first portion 11 and the second portion 12 may also be hollow structures with one side open, and the open side of the first portion 11 covers the open side of the second portion 12. Of course, the box body 10 formed by the first portion 11 and the second portion 12 may be in various shapes, such as a cylinder, a cuboid, etc.

[0060] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and then accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a converging component (such as Figure 5 The first busbar 40 and the second busbar 50 shown in FIG. 1 are used to realize electrical connection between multiple battery cells 20.

[0061] Each battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0062] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 20 includes a housing 21, an electrode assembly 22 and other functional components.

[0063] The housing 21 includes an end cap 211 and a shell 212. The end cap 211 is a component that covers the opening of the shell 212 to isolate the internal environment of the battery cell 20 from the external environment. The shape of the end cap 211 can be adapted to the shape of the shell 212 to match the shell 212.

[0064] Optionally, the end cap 211 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 211 is not easily deformed when squeezed and collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. Functional components such as poles 23 can be provided on the end cap 211. The pole 23 can be used to electrically connect with the electrode assembly 22 for outputting or inputting the electric energy of the battery cell 20. In some embodiments, the end cap 211 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the end cap 211 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 211, and the insulating member can be used to isolate the electrical connection components in the housing 212 from the end cap 211 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0065] The shell 212 is a component used to cooperate with the end cap 211 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, the electrolyte and other components. The shell 212 and the end cap 211 can be independent components, and an opening can be set on the shell 212, and the internal environment of the battery cell 20 is formed by covering the opening with the end cap 211 at the opening. Without limitation, the end cap 211 and the shell 212 can also be integrated. Specifically, the end cap 211 and the shell 212 can form a common connection surface before other components are put into the shell, and when the interior of the shell 212 needs to be encapsulated, the end cap 211 covers the shell 212. The shell 212 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 212 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 212 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0066] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be included in the housing 212. The electrode assembly 22 is mainly formed by stacking negative electrode sheets and positive electrode sheets, and a separator is usually provided between the negative electrode sheets and the positive electrode sheets. The parts of the negative electrode sheets and the positive electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the negative electrode sheets and the positive electrode sheets without active materials each constitute a lug. The negative electrode lug and the positive electrode lug may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the negative electrode active material and the positive electrode active material react with the electrolyte, and the lugs connect the electrode terminals to form a current loop.

[0067] According to some embodiments of the present application, referring to Figure 3 , and please refer to Figures 4 to 8 , Figure 4 is a schematic diagram of the structure of an electrode assembly in a battery cell according to some embodiments of the present application, Figure 5 and Figure 6 is a schematic diagram of the structure of a positive electrode sheet in a battery cell according to some embodiments of the present application, Figure 7 and Figure 8 The schematic diagram of the working state of the pole piece glue coating device according to some embodiments of the present application wrapping the first insulating member in the first empty foil area of ​​the battery cell. In the figure, the z direction is the first direction, the x direction is the second direction, and the y direction is the third direction.

[0068] The present application provides a battery cell 20, including a shell 21 and an electrode assembly 22, wherein the electrode assembly 22 is arranged in the shell 21, and the electrode assembly 22 is a laminated structure, wherein the electrode assembly 22 includes a positive electrode sheet 221, a negative electrode sheet 222 and a solid electrolyte layer 223, wherein the positive electrode sheet 221 and the negative electrode sheet 222 are stacked along a first direction, and the solid electrolyte layer 223 is arranged between the positive electrode sheet 221 and the negative electrode sheet 222.

[0069] The positive electrode plate 221 includes a positive electrode current collector 2211 and a positive electrode active material layer 2212. The positive electrode current collector 2211 includes a coating area a and a first empty foil area b. The positive electrode active material layer 2212 is arranged on the surface of the coating area a, and the positive electrode active material layer 2212 is not arranged on the surface of the first empty foil area b. Along the second direction, the first empty foil area b is arranged on at least one side of the coating area a, and the second direction is perpendicular to the first direction.

[0070] The positive electrode plate 221 further includes a first insulating member 2213, and the first insulating member 2213 wraps the first empty foil area b.

[0071] The positive electrode current collector 2211 has a first surface S1 and a second surface S2 arranged opposite to each other along a first direction, the positive electrode active material layer 2212 is arranged on the first surface S1 and the second surface S2, and the positive electrode current collector 2211 has a first side surface S3 in the second direction, and the first side surface S3 connects the first surface S1 and the second surface S2.

[0072] The first insulating member 2213 includes a first insulating portion 22131, a second insulating portion 22132 and a third insulating portion 22133. The first insulating portion 22131 is arranged on the first surface S1, the second insulating portion 22132 is arranged on the second surface S2, the third insulating portion 22133 is arranged on the first side surface S3, and the third insulating portion 22133 connects the first insulating portion 22131 and the second insulating portion 22132.

[0073] The solid electrolyte layer 223 uses a solid electrolyte as an insulator. The solid electrolyte is arranged between the positive electrode and the negative electrode, and plays the role of transmitting ions and isolating the positive and negative electrodes.

[0074] The positive electrode current collector 2211 may be a metal foil or a composite current collector. For example, as the metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium with surface silver plating may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0075] The positive active material selected for the positive active material layer 2212 may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive active materials for batteries may also be used.

[0076] The first direction is a thickness direction of the electrode assembly 22 , and the second direction is a width direction of the electrode assembly 22 .

[0077] In the technical solution of the embodiment of the present application, the positive electrode current collector 2211 has a first surface S1 and a second surface S2 in the first direction, and has a first side surface S3 connecting the first surface S1 and the second surface S2 in the second direction. The edge where the first surface S1 is connected to the first side surface S3, the edge where the second surface S2 is connected to the first side surface S3, and the first side surface S3 constitute the first empty foil area b of the positive electrode current collector 2211. By setting a first insulating member 2213 in the first empty foil area b of the positive electrode current collector 2211, and making the three insulating parts of the first insulating member 2213 respectively correspondingly arranged on each surface and side, so that the first insulating member 2213 can wrap the entire first empty foil area b, so that when the positive electrode sheet 221 and the negative electrode sheet 222 are stacked and misaligned and subjected to warm isostatic pressing, the possibility of end face overlap short circuit caused by bending at the misalignment is reduced, thereby improving the reliability of the battery cell, and reducing the design size of the first insulating member 2213, thereby improving the energy density of the battery cell.

[0078] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 and Figure 6 , the thickness of the first insulating portion 22131 , the thickness of the second insulating portion 22132 , and the thickness of the positive electrode active material layer 2212 are equal.

[0079] Since the positive electrode active material layer 2212 is arranged on the first surface S1 and the second surface S2, by making the thickness of the first insulating part 22131, the thickness of the second insulating part 22132 and the thickness of the positive electrode active material layer 2212 equal, the possibility of difficulty in stacking due to the first insulating part 22131 and the second insulating part 22132 protruding from the positive electrode active material layer 2212 can be reduced, and the possibility of gaps between the insulating parts and the solid electrolyte layer 223 due to the first insulating part 22131 and the second insulating part 22132 being recessed in the positive electrode active material layer 2212 can also be reduced.

[0080] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 and Figure 6 Along the second direction, the width of the positive electrode active material layer 2212 is smaller than the width of the positive electrode current collector 2211 , and the width of the first insulating portion 22131 and the width of the second insulating portion 22132 are both larger than the width of the third insulating portion 22133 .

[0081] The cross section of the first insulating member 2213 is “C”-shaped, so that each side of the first empty foil area b can be wrapped by the first insulating member 2213 .

[0082] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 and Figure 6 , along the second direction, the width of the first insulating portion 22131 is consistent with the width of the second insulating portion 22132.

[0083] The first insulating portion 22131 and the second insulating portion 22132 are symmetrically arranged about the positive electrode current collector 2211 along the first direction to form a corresponding first insulating member 2213 .

[0084] According to some embodiments of the present application, optionally, please continue to refer to Figure 4 The negative electrode sheet 222 includes a negative electrode current collector 2221 and a negative electrode active material layer 2222 , and the negative electrode active material layer 2222 is disposed on the surface of the negative electrode current collector 2221 .

[0085] The negative electrode current collector 2221 has a second side surface S4 in the second direction, and a side of the third insulating portion 22133 facing away from the positive electrode current collector 2211 is flush with the second side surface S4. The negative electrode current collector 2221 may be a metal foil or a composite current collector. For example, the metal foil may be aluminum with a silver coating on the surface, stainless steel with a silver coating on the surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium.

[0086] The negative electrode active material selected for the negative electrode active material layer 2222 can be a negative electrode active material for a battery known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0087] The negative electrode plate 222 is composed of a negative electrode current collector 2221 and a negative electrode active material layer 2222 arranged on the surface of the negative electrode current collector 2221. By making the second side surface S4 of the negative electrode current collector 2221 flush with the surface of the side of the third insulating part 22133 facing away from the positive electrode current collector 2211, the size of the negative electrode plate 222 can be larger than that of the positive electrode plate 221, thereby reducing the occurrence of lithium deposition during battery charging. At the same time, the possibility of forming a protruding edge between the negative electrode plate 222 and the first insulating part 2213 can be reduced, thereby improving the energy density of the battery cell.

[0088] According to some embodiments of the present application, optionally, along the second direction, a width of the first empty foil area b is 0.5 mm-2.5 mm.

[0089] By setting the width of the first empty foil area b to 0.5 mm-2.5 mm, such as 0.5 mm, 0.8 mm, 1.2 mm, 1.5 mm or 2 mm, the supporting and insulating protection functions can be better achieved.

[0090] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 , first empty foil areas b are provided on both sides of the coating area a along the second direction, and the positive electrode plate 221 includes two first insulating members 2213, and the two first insulating members 2213 respectively wrap the two first empty foil areas b.

[0091] By respectively arranging the first empty foil areas b on both sides of the coating area a along the second direction, and making each first empty foil area b wrapped in the corresponding first insulating member 2213, the two sides of the positive electrode plate 221 are insulated and protected along the second direction, thereby reducing the possibility of end face overlap short circuit caused by bending at the misaligned position and improving the reliability of the battery cell.

[0092] According to some embodiments of the present application, optionally, the first insulating member 2213 is UV insulating glue.

[0093] The first insulating member 2213 is made of UV insulating glue to achieve the insulation and support functions of the first insulating member 2213 .

[0094] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 The positive electrode current collector 2211 includes a main body 22111 and a positive electrode tab 22112. The main body 22111 includes a coating area a and a first empty foil area b. The positive electrode tab 22112 extends from one end of the main body 22111 along the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

[0095] The third direction is the length direction of the electrode assembly 22 .

[0096] The positive electrode tab 22112 is disposed on one side of the main body 22111 along the third direction to form the positive electrode current collector 2211 .

[0097] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 and Figure 8 The main body 22111 further includes a second empty foil area c, a surface of which is not provided with the positive electrode active material layer 2212, and along the third direction, the second empty foil area c is provided on at least one side of the coating area a.

[0098] The positive electrode plate 221 further includes a second insulating member 2214, and the second insulating member 2214 covers the second empty foil area c.

[0099] By arranging a second empty foil area c on at least one side of the main body 22111 along the third direction and arranging a second insulating member 2214 on the second empty foil area c, the positive electrode plate 221 can be insulated and protected laterally along the third direction, while supporting the negative electrode plate 222, thereby improving the reliability of the battery cell.

[0100] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 and Figure 8 The coating area a is provided with second empty foil areas c on both sides along the third direction, and the positive electrode sheet 221 includes two second insulating members 2214 , and the two second insulating members 2214 cover the two second empty foil areas c respectively.

[0101] By respectively providing second empty foil areas c on both sides of the main body 22111 along the third direction, and providing a second insulating member 2214 on each second empty foil area c, both sides of the positive electrode sheet 221 can be insulated and protected along the third direction, while supporting the negative electrode sheet 222, thereby improving the reliability of the battery cell.

[0102] According to some embodiments of the present application, optionally, the second insulating member 2214 is adjacent to the first insulating member 2213 .

[0103] By making the second insulating member 2214 adjacent to the first insulating member 2213 , the second insulating member 2214 and the first insulating member 2213 can form a continuous insulating structure surrounding the positive electrode active material layer 2212 , thereby improving the reliability of the battery cell.

[0104] According to some embodiments of the present application, the present application provides a battery 100. The battery 100 includes a battery cell 20 according to any of the above solutions.

[0105] According to some embodiments of the present application, the present application also provides an electrical device, comprising a battery according to any of the above schemes, and the battery is used to provide electrical energy to the electrical device.

[0106] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0107] According to some embodiments of this application, please refer to Figures 7 to 10 , Figures 7 to 9 This is a schematic diagram of the operation of the pole piece glue coating device wrapping the first insulating member 2213 in the first empty foil area b of the battery cell according to some embodiments of the present application. Fig.10 The present application provides a pole piece glue coating device, which is used to wrap the first insulating member 2213 in the first empty foil area b of the positive pole piece 221 of the battery cell in the above embodiment.

[0108] The electrode glue coating device includes a glue supply device and a glue coating nozzle 400, wherein the glue coating nozzle 400 is provided with a first flow channel 401, a second flow channel 402 and a spray chamber 403, wherein the outlet of the first flow channel 401 and the outlet of the second flow channel 402 are respectively connected to the spray chamber 403, and the outlet of the first flow channel 401 and the outlet of the second flow channel 402 are arranged opposite to each other along a first direction. The spray chamber 403 can be inserted with the first empty foil area b of the positive electrode 221.

[0109] The glue supply device is used to provide insulating glue to the first flow channel 401 and the second flow channel 402 so that the insulating glue can be sprayed to the first empty foil area b of the positive electrode plate 221 through the first flow channel 401 and the second flow channel 402 to form the first insulating member 2213.

[0110] In the technical solution of the embodiment of the present application, when the first empty foil area b wraps the first insulating member 2213, the first empty foil area b can be at least partially inserted into the spray chamber 403, and then the insulating glue is provided to the first flow channel 401 and the second flow channel 402 of the glue coating nozzle 400 through the glue supply device, so that the insulating glue can be sprayed to the first empty foil area b through each flow channel, thereby forming the first insulating member 2213. The pole piece glue coating device can realize the rapid spraying of the first insulating member 2213, and improve the processing efficiency of the battery cell.

[0111] According to some embodiments of the present application, optionally, please continue to refer to Figure 7 The glue coating nozzle 400 and the positive electrode plate 221 can slide relative to each other along the third direction.

[0112] The first direction, the second direction and the third direction are perpendicular to each other.

[0113] By making the glue coating nozzle 400 and the positive electrode plate 221 slide relative to each other along the third direction, the first empty foil area b arranged on the side of the coating area a along the second direction is continuously sprayed, thereby improving the processing efficiency of the battery cell.

[0114] According to some embodiments of the present application, optionally, please continue to refer to Figure 5 , Figure 7 and Figure 8 , first empty foil areas b are provided on both sides of the coating area a of the positive electrode sheet 221 along the second direction.

[0115] Two glue coating nozzles 400 are provided, and the two glue coating nozzles 400 are arranged opposite to each other along the second direction.

[0116] One of the first empty foil areas b of the positive electrode sheet 221 can be inserted into the spray cavity 403 of one of the glue coating nozzles 400 , and the other first empty foil area b of the positive electrode sheet 221 can be inserted into the spray cavity 403 of the other glue coating nozzle 400 .

[0117] When first empty foil areas b are provided on both sides of the coating area a along the second direction, two glue coating nozzles 400 can be provided so that each first empty foil area b is sprayed synchronously by the corresponding glue coating nozzle 400, thereby improving the processing efficiency of the battery cell.

[0118] According to some embodiments of the present application, see Figures 3 to 8 The present application provides a battery cell 20, wherein the battery cell 20 includes a shell 21 and an electrode assembly 22 arranged in the shell 21, the electrode assembly 22 is a laminated structure, the electrode assembly 22 includes a positive electrode sheet 221, a negative electrode sheet 222 and a solid electrolyte layer 223, the positive electrode sheet 221 and the negative electrode sheet 222 are stacked along a first direction, and the solid electrolyte layer 223 is arranged between the positive electrode sheet 221 and the negative electrode sheet 222.

[0119] The positive electrode sheet 221 includes a positive current collector 2211, a positive active material layer 2212, two first insulating members 2213 and two second insulating members 2214. The positive current collector 2211 includes a main body 22111 and a positive electrode tab 22112. The main body 22111 includes a coating area a, a first empty foil area b provided on both sides of the coating area a along the second direction, and a second empty foil area c provided on both sides of the coating area a along the third direction. The surface of the coating area a is provided with a positive active material layer 2212, and the surfaces of the first empty foil area b and the second empty foil area c are not provided with a positive active material layer 2212.

[0120] The two first insulating members 2213 respectively wrap the two first empty foil areas b, and the two second insulating members 2214 respectively cover the two second empty foil areas c.

[0121] The positive electrode current collector 2211 has a first surface S1, a second surface S2 and a first side surface S3. The first surface S1 and the second surface S2 are arranged opposite to each other along a first direction. The first side surface S3 connects the first surface S1 and the second surface S2. The positive electrode active material layer 2212 is arranged on the first surface S1 and the second surface S2.

[0122] The first insulating member 2213 includes a first insulating portion 22131 disposed on the first surface S1, a second insulating portion 22132 disposed on the second surface S2, and a third insulating portion 22133 disposed on the first side surface S3, the third insulating portion 22133 connects the first insulating portion 22131 and the second insulating portion 22132, and the cross-section of the first insulating member 2213 is "C"-shaped.

[0123] 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, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: shell; as well as An electrode assembly is disposed in the housing, the electrode assembly is a laminated structure, the electrode assembly comprises a positive electrode sheet, a negative electrode sheet and a solid electrolyte layer, the positive electrode sheet and the negative electrode sheet are stacked along a first direction, and the solid electrolyte layer is disposed between the positive electrode sheet and the negative electrode sheet; The positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode current collector comprises a coating area and a first empty foil area, the surface of the coating area is provided with the positive electrode active material layer, the surface of the first empty foil area is not provided with the positive electrode active material layer, along the second direction, the first empty foil area is provided on at least one side of the coating area, and the second direction is perpendicular to the first direction; Wherein, the positive electrode plate further includes a first insulating member, and the first insulating member wraps the first empty foil area; The positive electrode current collector has a first surface and a second surface arranged opposite to each other along the first direction, the positive electrode active material layer is arranged on the first surface and the second surface, and the positive electrode current collector has a first side surface in the second direction, and the first side surface connects the first surface and the second surface; The first insulating member includes a first insulating portion, a second insulating portion and a third insulating portion, the first insulating portion is arranged on the first surface, the second insulating portion is arranged on the second surface, the third insulating portion is arranged on the first side surface, and the third insulating portion connects the first insulating portion and the second insulating portion.

2. The battery cell according to claim 1, characterized in that: The thickness of the first insulating portion, the thickness of the second insulating portion, and the thickness of the positive electrode active material layer are equal.

3. The battery cell according to claim 1, characterized in that: Along the second direction, the width of the positive electrode active material layer is smaller than the width of the positive electrode current collector, and the width of the first insulating portion and the width of the second insulating portion are both larger than the width of the third insulating portion.

4. The battery cell according to claim 3, characterized in that: Along the second direction, the width of the first insulating portion is consistent with the width of the second insulating portion.

5. The battery cell according to claim 1, characterized in that: The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is arranged on the surface of the negative electrode current collector; The negative electrode current collector has a second side surface in the second direction, and a side of the third insulating portion facing away from the positive electrode current collector is flush with the second side surface.

6. The battery cell according to claim 1, characterized in that: Along the second direction, the width of the first empty foil area is 0.5 mm-2.5 mm.

7. The battery cell according to claim 1, characterized in that: The first empty foil areas are arranged on both sides of the coating area along the second direction, and the positive electrode plate includes two first insulating members, and the two first insulating members respectively wrap the two first empty foil areas.

8. The battery cell according to claim 1, characterized in that: The first insulating member is UV insulating glue.

9. The battery cell according to claim 1, characterized in that: The positive electrode current collector includes a main body and a positive electrode tab, the main body includes the coating area and the first empty foil area, the positive electrode tab extends from one end of the main body along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

10. The battery cell according to claim 9, characterized in that: The main body also includes a second empty foil area, the surface of the second empty foil area is not provided with the positive electrode active material layer, and along the third direction, the second empty foil area is provided on at least one side of the coating area; The positive electrode plate also includes a second insulating member, and the second insulating member covers the second empty foil area.

11. The battery cell according to claim 10, characterized in that: The second empty foil areas are arranged on both sides of the coating area along the third direction, and the positive electrode plate includes two second insulating members, and the two second insulating members cover the two second empty foil areas respectively.

12. The battery cell according to claim 10, characterized in that: The second insulating member is adjacent to the first insulating member.

13. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: A battery cell comprising any one of claims 1 to 12, or a battery comprising claim 13.

15. A pole piece glue coating device, characterized in that: Used to wrap a first insulating member in a first empty foil area of ​​a positive electrode sheet of a battery cell according to any one of claims 1 to 12; The electrode glue coating device comprises a glue supply device and a glue coating nozzle, wherein the glue coating nozzle is provided with a first flow channel, a second flow channel and a spray cavity, wherein the outlet of the first flow channel and the outlet of the second flow channel are respectively connected to the spray cavity, and the outlet of the first flow channel and the outlet of the second flow channel are arranged opposite to each other along the first direction; the spray cavity can be used for inserting the first empty foil area of ​​the positive electrode sheet; The glue supply device is used to provide insulating glue to the first flow channel and the second flow channel, so that the insulating glue can be sprayed to the first empty foil area of ​​the positive electrode plate through the first flow channel and the second flow channel to form the first insulating member.

16. The pole piece glue coating equipment according to claim 15, characterized in that: The glue coating nozzle and the positive electrode plate can slide relative to each other along a third direction; The first direction, the second direction and the third direction are perpendicular to each other.

17. The pole piece glue coating equipment according to claim 15 or 16, characterized in that: The first empty foil area is provided on both sides of the coating area of ​​the positive electrode sheet along the second direction; The two gluing nozzles are provided with two, and the two gluing nozzles are arranged opposite to each other along the second direction; One of the first empty foil areas of the positive electrode plate can be inserted into the spray cavity of one of the glue coating nozzles, and another of the first empty foil areas of the positive electrode plate can be inserted into the spray cavity of another of the glue coating nozzles.

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