Battery cell, battery apparatus, electrical apparatus, electrode assembly, and preparation method therefor

Abstract

A battery cell, a battery apparatus, an electrical apparatus, an electrode assembly, and a preparation method therefor, relating to the technical field of batteries. The battery cell comprises a casing and an electrode assembly. The electrode assembly is accommodated in the casing. The electrode assembly comprises a first electrode plate, a second electrode plate, a solid-state electrolyte layer, and an insulating member. The first electrode plate comprises a first active substance region and a first tab. The first tab protrudes from the first active substance region. The polarity of the second electrode plate is opposite to that of the first electrode plate. The second electrode plate comprises a main body region and a protrusion region beyond the first active substance region. The main body region and the first active substance region are stacked in a first direction. In the first direction, at least part of the solid-state electrolyte layer is disposed between the first electrode plate and the second electrode plate. The insulating member is disposed in an edge region of the first active substance region, and the insulating member is configured to insulate and isolate the protrusion region from the first active substance region. The risk of overlapping between the protrusion region and the first active substance region is reduced, and the reliability of the battery cell is improved.

Description

Battery cell, battery device, electric device, electrode assembly and preparation method thereof TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, a battery device, an electric device, an electrode assembly and a preparation method thereof. BACKGROUND

[0002] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. With the increasing demand for batteries, higher requirements are placed on the reliability of battery cells. Therefore, how to improve the reliability of battery cells is a problem to be solved in battery technology.

[0003] SUMMARY

[0004] The embodiments of the present application provide a battery cell, a battery device, an electric device, an electrode assembly and a preparation method thereof, which can effectively improve the reliability of the battery cell.

[0005] In a first aspect, the embodiments of the present application provide a battery cell, comprising a shell and an electrode assembly, the electrode assembly being accommodated in the shell; the electrode assembly comprises a first electrode sheet, a second electrode sheet, a solid-state electrolyte layer and an insulating piece; the first electrode sheet comprises a first active material region and a first tab, the first tab protruding from the first active material region; the second electrode sheet is opposite in polarity to the first electrode sheet, the second electrode sheet comprising a main body region and an overhanging region beyond the first active material region, the main body region being stacked with the first active material region along a first direction; at least part of the solid-state electrolyte layer is arranged between the first electrode sheet and the second electrode sheet along the first direction; the insulating piece is arranged at an edge region of the first active material region, and the insulating piece is configured to insulate and isolate the overhanging region and the first active material region.

[0006] In the above technical solution, the edge region of the first active material region is provided with the insulating piece, the insulating piece can insulate and isolate the overhanging region of the second electrode sheet and the first active material region of the first electrode sheet, reducing the risk of overlap between the overhanging region and the first active material region, thereby reducing the risk of short circuit between the first electrode sheet and the second electrode sheet, and improving the reliability of the battery cell.

[0007] In some embodiments, along the first direction, the first active material region has a first surface facing the host region, at least part of the overhang region is located on a side of the first surface away from the host region, and at least part of the insulating member is located between the overhang region and the first active material region. The at least part of the overhang region located on the side of the first surface away from the host region allows the overhang region to protect the first active material region to some extent, thereby reducing the risk of damage to the first active material region. The at least part of the insulating member located between the overhang region and the first active material region can effectively reduce the risk of the overhang region and the first active material region being overlapped.

[0008] In some embodiments, the solid-state electrolyte layer includes a first portion and a second portion, along the first direction, the first portion and the second portion are arranged in a staggered manner, the first portion is arranged between the host region and the first active material region, and the second portion is arranged in a stacked manner with the overhang region; along the first direction, the first active material region has a first surface facing the host region, at least part of the second portion is located on a side of the first surface away from the host region, and at least part of the insulating member is located between the second portion and the first active material region. The second portion of the solid-state electrolyte layer is arranged in a stacked manner with the overhang region, so that the solid-state electrolyte layer can cover part of the surface of the overhang region, thereby reducing the risk of the overhang region and the first active material region being overlapped. The at least part of the second portion located on the side of the first surface away from the host region and the at least part of the insulating member located between the second portion and the first active material region allow the insulating member to cover more areas of the side surface of the first active material region connected to the first surface, thereby reducing the risk of the overhang region and the side surface of the first active material region being overlapped.

[0009] In some embodiments, along the first direction, at least part of the insulating member is located between the first active material region and the host region. The part of the insulating member located between the first active material region and the host region can separate the first active material region and the host region, thereby reducing the risk of the edge region of the first active material region and the host region being overlapped.

[0010] In some embodiments, along the first direction, the part of the insulating member located between the first active material region and the host region is connected to a side of the first active material region facing the host region. This allows the insulating member to be connected to the first active material region, thereby improving the firmness of the insulating member and reducing the risk of the insulating member being separated.

[0011] In some embodiments, the host region is provided with an overhang region at at least one end along a second direction, the first active material region is provided with an insulating member at an end close to the overhang region along the second direction, and the second direction is perpendicular to the first direction. This can reduce the risk of the overhang region and the first active material region being overlapped in the second direction, thereby reducing the risk of the first electrode tab and the second electrode tab being short-circuited.

[0012] In some embodiments, two second electrode plates are arranged on both sides of the first electrode plate along the first direction; two insulating members are arranged at the end of the first active material region close to the overhanging region along the second direction, and the insulating member arranged at at least one end of the first active material region along the second direction comprises a first insulating part, a second insulating part and a third insulating part connected in sequence; along the first direction, at least part of the first insulating part is arranged between the first active material region and the main body region, and at least part of the third insulating part is arranged between the overhanging regions of the two adjacent second electrode plates; along the second direction, at least part of the second insulating part is arranged between the first active material region and the overhanging region. By arranging two insulating members at the end of the first active material region close to the overhanging region along the second direction, the overhanging regions of the second electrode plates located on both sides of the first electrode plate along the second direction can be insulated from the first active material region of the first electrode plate, and the overhanging regions of the two adjacent second electrode plates along the second direction can be separated, reducing the risk of mutual influence of the overhanging regions. The insulating member of this structure has lower requirements for dimensional accuracy and higher installation efficiency. In addition, since at least part of the second insulating part of the insulating member is arranged between the first active material region and the overhanging region along the second direction, the second insulating part not only separates the first active material region and the overhanging region, but also reduces the risk of contact between burrs generated at the end of the first active material region along the second direction during molding and the overhanging region, thereby reducing the risk of short circuit between the first electrode plate and the second electrode plate.

[0013] In some embodiments, along the first direction, the first insulating parts of the two insulating members are respectively connected to the opposite sides of the first active material region. Connecting the two insulating members to the opposite sides of the first active material region improves the firmness of the insulating member and reduces the risk of disconnection. During the preparation of the electrode assembly, the first insulating parts of the two insulating members can be respectively connected to the opposite sides of the first active material region first, and then the first electrode plate, the solid electrolyte layer and the second electrode plate are stacked after the two insulating members are fixed at the end of the first active material region along the second direction, which can effectively reduce the installation difficulty of the insulating member.

[0014] In some embodiments, the third insulating parts of the two insulating members arranged at at least one end of the first active material region along the second direction are connected to each other. Connecting the third insulating parts of the two insulating members to each other forms an integral whole to keep the second insulating parts of the two insulating members between the first active material region and the overhanging region, and the cooperation of the two insulating members can cover more areas of the end surface of the first active material region along the second direction, reducing the risk of lap joint between the overhanging region and the end surface of the first active material region.

[0015] In some embodiments, along the second direction, at least one end of the first active material region is provided with a first tab; and along the first direction, at least a portion of the third insulating part is located between the first tab and the overhanging region in the insulating member provided at the end of the first active material region close to the first tab along the second direction. The third insulating part can function to separate the first tab and the overhanging region, and reduce the risk of the overhanging region overlapping the first tab, thereby causing the first tab and the second tab to short circuit.

[0016] In some embodiments, along the second direction, the third insulating part overhangs the end of the overhanging region away from the main body region. The third insulating part has a larger size along the second direction, which increases the insulating range of the third insulating part along the second direction, and further enhances the insulating capacity of the third insulating part.

[0017] In some embodiments, along the first direction, both sides of the first tab are provided with a second tab; and the insulating member provided at at least one end of the first active material region along the second direction comprises a second insulating part and two first insulating parts, the second insulating part connecting the two first insulating parts; along the first direction, at least a portion of one first insulating part is located between the first active material region and the main body region of one second tab, and at least a portion of the other first insulating part is located between the first active material region and the main body region of the other second tab; and along the second direction, at least a portion of the second insulating part is located between the first active material region and the overhanging region. The insulating member with such a structure can achieve the insulating isolation of the second tabs located on both sides of the first tab from the first active material region of the first tab along the second direction in the overhanging region, has a simple structure, and reduces the use of materials for the insulating member. In addition, since at least a portion of the second insulating part of the insulating member is located between the first active material region and the overhanging region along the second direction, the second insulating part can not only separate the first active material region and the overhanging region, but also separate the risk of the burrs generated during the forming of the end of the first active material region along the second direction from contacting the overhanging region, thereby reducing the risk of the first tab and the second tab short circuiting.

[0018] In some embodiments, along the first direction, the two first insulating parts are respectively connected to the opposite sides of the first active material region. The two first insulating parts are respectively connected to the opposite sides of the first active material region, which improves the firmness of the insulating member and reduces the risk of the insulating member detaching. During the preparation of the electrode assembly, the two first insulating parts of the insulating member can be respectively connected to the opposite sides of the first active material region first, and then the first tab, the solid electrolyte layer and the second tab are stacked after the insulating member is fixed at the end of the first active material region along the second direction, which can effectively reduce the installation difficulty of the insulating member.

[0019] In some embodiments, the first insulation part has a dimension L1 along the second direction, and 0.1 mm≤L1≤10 mm. L1≥0.1 mm so that the first insulation part has a sufficient dimension along the second direction, which is conducive to enhancing the firmness of the insulation part and reducing the risk of the insulation part coming off; and L1≤10 mm so that the dimension of the first insulation part along the second direction is not too large, which on one hand reduces the influence of the first insulation part on the transmission of active ions between the first and second pole pieces, and on the other hand reduces the material use of the first insulation part and has better economy.

[0020] In some embodiments, 2 mm≤L1≤8 mm. The firmness and economy of the insulation part are further taken into account.

[0021] In some embodiments, the body region is provided with an overhanging region at each of the two opposite ends along the second direction, and the first active substance region is provided with an insulation part at each of the two opposite ends along the second direction. In this way, the risk of the two overhanging regions of the second pole piece along the second direction being overlapped with the first active substance region is reduced, thereby reducing the risk of short circuit between the first and second pole pieces.

[0022] In some embodiments, at least one end of the body region along the third direction is provided with an overhanging region, and the first active substance region is provided with an insulation part at the end along the third direction close to the overhanging region, and the first and second directions are both perpendicular to the third direction. In this way, the risk of the overhanging region along the third direction being overlapped with the first active substance region is reduced, thereby reducing the risk of short circuit between the first and second pole pieces.

[0023] In some embodiments, along the first direction, the two sides of the first tab are provided with the second tabs; two insulating pieces are arranged at the end of the first active material area close to the overhanging area along the third direction, and the insulating piece arranged at at least one end of the first active material area along the third direction comprises a fourth insulating part, a fifth insulating part and a sixth insulating part connected in sequence; along the first direction, at least part of the fourth insulating part is arranged between the first active material area and the main body area, and at least part of the sixth insulating part is arranged between the overhanging areas of the two adjacent second tabs; along the third direction, at least part of the fifth insulating part is arranged between the first active material area and the overhanging area. By arranging two insulating pieces at the end of the first active material area close to the overhanging area along the third direction, the overhanging areas of the second tabs located on both sides of the first tab in the third direction can be insulated from the first active material area of the first tab, and the overhanging areas of the two adjacent second tabs in the third direction can be separated, reducing the risk of mutual influence of the overhanging areas. The insulating piece of this structure has lower requirements for dimensional accuracy and higher installation efficiency. In addition, since at least part of the fifth insulating part of the insulating piece is arranged between the first active material area and the overhanging area along the third direction, the fifth insulating part not only separates the first active material area and the overhanging area, but also reduces the risk of contact between burrs generated at the end of the first active material area along the third direction during molding and the overhanging area, thereby reducing the risk of short circuit between the first tab and the second tab.

[0024] In some embodiments, along the first direction, the fourth insulating parts of the two insulating pieces are respectively connected to the opposite sides of the first active material area. Connecting the fourth insulating parts of the two insulating pieces to the opposite sides of the first active material area respectively improves the firmness of the insulating piece and reduces the risk of disengagement. During the preparation of the electrode assembly, the fourth insulating parts of the two insulating pieces can be connected to the opposite sides of the first active material area respectively, and then the two insulating pieces are fixed at the end of the first active material area along the third direction, and then the first tab, the solid electrolyte layer and the second tab are stacked, which can effectively reduce the installation difficulty of the insulating piece.

[0025] In some embodiments, the sixth insulating parts of the two insulating pieces arranged at at least one end of the first active material area along the third direction are connected to each other. The two insulating pieces form a whole to keep the fifth insulating parts of the two insulating pieces between the first active material area and the overhanging area, and the cooperation of the two insulating pieces can cover more areas of the end surface of the first active material area in the third direction, reducing the risk of lap joint between the overhanging area and the end surface of the first active material area.

[0026] In some embodiments, along the third direction, the sixth insulating part exceeds one end of the overhanging area away from the main body area. The sixth insulating part has a larger size along the third direction, increasing the insulation range of the sixth insulating part in the third direction, and thereby enhancing the insulation capacity of the sixth insulating part.

[0027] In some embodiments, along the first direction, the two sides of the first tab are provided with the second tabs; the insulating member provided at the at least one end of the first active material region along the third direction comprises a fifth insulating portion and two fourth insulating portions, the fifth insulating portion connecting the two fourth insulating portions; along the first direction, at least part of one fourth insulating portion is provided between the first active material region and the main body region of one second tab, and at least part of the other fourth insulating portion is provided between the first active material region and the main body region of the other second tab; along the third direction, at least part of the fifth insulating portion is provided between the first active material region and the overhanging region. The insulating member with such a structure can realize the insulation isolation of the overhanging region of the second tab on the two sides of the first tab from the first active material region of the first tab along the third direction, has a simple structure, and reduces the material use of the insulating member. In addition, since at least part of the fifth insulating portion of the insulating member is provided between the first active material region and the overhanging region along the third direction, the fifth insulating portion not only can separate the first active material region and the overhanging region, but also can reduce the risk of contact between burrs generated during forming of the end of the first active material region along the third direction and the overhanging region, thereby reducing the risk of short circuit between the first tab and the second tab.

[0028] In some embodiments, along the first direction, the two fourth insulating portions are respectively connected to the opposite sides of the first active material region. The two fourth insulating portions are respectively connected to the opposite sides of the first active material region, which improves the firmness of the insulating member and reduces the risk of separation of the insulating member. During preparation of the electrode assembly, the two fourth insulating portions of the insulating member can be respectively connected to the opposite sides of the first active material region first, and then the first tab, the solid electrolyte layer and the second tab are stacked after the insulating member is fixed at the end of the first active material region along the third direction, which can effectively reduce the installation difficulty of the insulating member.

[0029] In some embodiments, the fourth insulating portion has a size L2 along the third direction, and 0.1 mm≤L2≤10 mm. L2≥0.1 mm makes the fourth insulating portion have a sufficient size along the third direction, which is conducive to enhancing the firmness of the insulating member and reducing the risk of separation of the insulating member; L2≤10 mm makes the size of the fourth insulating portion along the third direction not too large, which on the one hand reduces the influence of the first insulating portion on the transmission of active ions between the first tab and the second tab, and on the other hand reduces the material use of the first insulating portion, and has better economy.

[0030] In some embodiments, 2 mm≤L2≤8 mm. The firmness and economy of the insulating member are further considered.

[0031] In some embodiments, the body region is provided with an overhanging region at each of the two opposite ends in the third direction, and the first active material region is provided with an insulating member at each of the two opposite ends in the third direction. In this way, the risk of the two overhanging regions of the second tab being overlapped with the first active material region in the third direction can be reduced, thereby reducing the risk of short circuit between the first tab and the second tab.

[0032] In some embodiments, the first tab is a positive tab, and the second tab is a negative tab. In this way, the overhanging region of the negative tab is larger than that of the positive tab, and more metal ions (e.g., lithium ions) released by the positive tab during charging can be received by the negative tab, thereby effectively improving the performance of the battery cell.

[0033] In some embodiments, the insulating member is a polymer film. The polymer film has good insulation performance, as well as good strength and ductility.

[0034] In some embodiments, the insulating member includes at least one of polypropylene, polyolefin, ethylene-vinyl acetate copolymer, epoxy resin glue, silicone rubber, polyurethane, and polyethylene terephthalate.

[0035] In a second aspect, the embodiments of the present application provide a battery device, which includes the battery cell provided by any one of the embodiments of the first aspect.

[0036] In a third aspect, the embodiments of the present application provide a power consumption device, which includes the battery cell provided by any one of the embodiments of the first aspect or the battery device provided by any one of the embodiments of the second aspect, and the battery cell is configured to provide electric energy.

[0037] In a fourth aspect, the embodiments of the present application provide an electrode assembly, which includes a first tab, a second tab, a solid-state electrolyte layer, and an insulating member. The first tab includes a first active material region and a first tab lug, and the first tab lug protrudes from the first active material region. The second tab is opposite in polarity to the first tab, and the second tab includes a body region and an overhanging region that protrudes from the first active material region. The body region is stacked with the first active material region in a first direction. At least part of the solid-state electrolyte layer is arranged between the first tab and the second tab in the first direction. The insulating member is arranged at an edge region of the first active material region, and is configured to insulate and isolate the overhanging region and the first active material region.

[0038] In the above technical solution, the edge region of the first active material region is provided with the insulating member, which can insulate and isolate the overhanging region of the second tab and the first active material region of the first tab, thereby reducing the risk of the overhanging region being overlapped with the first active material region, and further reducing the risk of short circuit between the first tab and the second tab.

[0039] In a fifth aspect, the embodiments of the present application further provide a preparation method of an electrode assembly, comprising: step S100: providing a first electrode sheet, a solid-state electrolyte layer and a second electrode sheet; wherein the first electrode sheet and the second electrode sheet are opposite in polarity, the first electrode sheet comprises a first active material region and a first tab, the first tab protrudes from the first active material region, and an edge region of the first active material region is provided with an insulating member; step S200: stacking the first electrode sheet, the solid-state electrolyte layer and the second electrode sheet in a first direction to form a stacked structure; and step S300: performing pressure treatment on the stacked structure, so that the second electrode sheet forms an overhanging region beyond the first active material region, and the insulating member insulates and separates the overhanging region and the first active material region.

[0040] The electrode assembly prepared by the above scheme can insulate and separate the overhanging region of the second electrode sheet from the first active material region of the first electrode sheet, thereby reducing the risk of overlap between the overhanging region and the first active material region, and further reducing the risk of short circuit between the first electrode sheet and the second electrode sheet.

[0041] In some embodiments, step S200 comprises: step S210: compounding the second electrode sheet and the solid-state electrolyte layer to form a compound electrode sheet; and step S220: alternately stacking the first electrode sheet and the compound electrode sheet in the first direction to form the stacked structure. Compounding the second electrode sheet and the solid-state electrolyte layer to form a compound electrode sheet, and then alternately stacking the first electrode sheet and the compound electrode sheet in the first direction, can reduce the difficulty of stacking the first electrode sheet, the solid-state electrolyte layer and the second electrode sheet.

[0042] In some embodiments, step S300 comprises: performing isostatic pressing treatment on the stacked structure. The isostatic pressing method is used to apply pressure to the stacked structure, so that the stacked structure is subjected to more uniform stress, and the first electrode sheet and the second electrode sheet are better adhered to the solid-state electrolyte layer.

[0043] In some embodiments, the pressure of the isostatic pressing treatment is 100-1000 Mpa. The isostatic pressing treatment is performed on the stacked structure at a pressure of 100-1000 Mpa, so that the first electrode sheet and the second electrode sheet can be tightly adhered to the solid-state electrolyte layer, the interface impedance between the electrode sheet and the solid-state electrolyte layer is reduced, the structure of the electrode assembly is more compact, the volume energy density of the battery cell is improved, and the risk of damage to the first electrode sheet, the second electrode sheet and the solid-state electrolyte layer is reduced.

[0044] In some embodiments, the pressure of the isostatic pressing treatment is 300-800 Mpa.

[0045] In some embodiments, the temperature of the isostatic pressing treatment is 0-300℃. Controlling the temperature of the isostatic pressing treatment within the range of 0-300℃ can more easily adhere the first electrode sheet and the second electrode sheet to the solid-state electrolyte layer.

[0046] In some embodiments, the temperature of the isostatic pressing process is 80-150°C.

[0047] In some embodiments, the duration of the isostatic pressing process is 1-100 min. This can improve the tightness of both the first and second pole pieces to the solid electrolyte layer.

[0048] In some embodiments, the duration of the isostatic pressing process is 10-80 min. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those of ordinary skill in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0050] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0051] FIG. 2 is an exploded view of a battery device according to some embodiments of the present application;

[0052] FIG. 3 is an exploded view of a battery cell according to some embodiments of the present application;

[0053] FIG. 4 is an axonometric view of the battery cell shown in FIG. 3;

[0054] FIG. 5 is an A-A sectional view of the battery cell shown in FIG. 4;

[0055] FIG. 6 is a structural schematic diagram of an electrode assembly according to some embodiments of the present application;

[0056] FIG. 7 is a structural schematic diagram of a first pole piece according to some embodiments of the present application;

[0057] FIG. 8 is a structural schematic diagram of a second pole piece according to some embodiments of the present application;

[0058] FIG. 9 is a partial enlarged view of B in FIG. 6;

[0059] FIG. 10 is a partial enlarged view of C in FIG. 6;

[0060] FIG. 11 is a structural schematic diagram of an insulating member shown in FIG. 9;

[0061] FIG. 12 is a structural schematic diagram of an electrode assembly according to some other embodiments of the present application;

[0062] FIG. 13 is a partial enlarged view of D in FIG. 12;

[0063] FIG. 14 is a structural schematic diagram of an insulating member shown in FIG. 13;

[0064] Fig. 15 is a structural schematic diagram of an electrode assembly according to some embodiments of the present application;

[0065] Fig. 16 is a structural schematic diagram of a portion of Fig. 15 at E;

[0066] Fig. 17 is a structural schematic diagram of an electrode assembly according to some embodiments of the present application;

[0067] Fig. 18 is a structural schematic diagram of a portion of Fig. 17 at F;

[0068] Fig. 19 is a flow chart of a method of manufacturing an electrode assembly according to some embodiments of the present application.

[0069] Fig. 19 is a flow chart of a method of manufacturing an electrode assembly according to some embodiments of the present application. DETAILED DESCRIPTION

[0070] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall into the scope of the present application.

[0071] 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 in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise", "comprises", "comprising", "containing", "contains", "contain" or any other variation thereof, is intended to cover a non-exclusive inclusion; the use herein of terms such as "first", "second" and the like does not imply a limitation on the number of objects but merely distinguishes between certain embodiments.

[0072] Reference throughout this application to "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 appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments.

[0073] The term "and / or", within the context of this application, is used to mean "one or the other or both". The term "and / or", within the context of this application, is used to mean "one or the other or both". In addition, the character " / " within the context of this application, generally represents a "or" relationship between the front and rear associated objects.

[0074] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0075] "Multiple" appearing in the present application means two or more (including two).

[0076] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0077] The battery cell includes, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc.

[0078] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can reduce the risk of short circuit of the positive and negative electrodes, and at the same time allow the active ions to pass through.

[0079] In some embodiments, the cathode can be a cathode tab, and the cathode tab can include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector.

[0080] As an example, the cathode current collector has two surfaces opposite in the thickness direction thereof, and the cathode active material is disposed on either one or both of the two surfaces of the cathode current collector.

[0081] As an example, the cathode current collector can employ a metal foil or a composite current collector. For example, as the metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0082] As an example, the cathode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery cathode active material can also be used. These cathode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (which can also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn0.2 O2(also can be referred to as NCM 622 ), LiNi 0.7 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 711 ), LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof.

[0083] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the foam metal surface can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0084] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative electrode current collector.

[0085] As an example, the negative electrode current collector can employ a metal foil, a foam metal, or a composite current collector. For example, as the metal foil, an aluminum with a silver plating treatment on the surface, a stainless steel with a silver plating treatment on the surface, a stainless steel, a copper, an aluminum, a nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0086] As an example, the negative electrode tab can include the negative electrode current collector and the negative electrode active material provided on at least one surface of the negative electrode current collector.

[0087] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on any one or both of the two opposite surfaces of the negative electrode current collector.

[0088] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite, and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound, and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative active material can also be used. These negative active materials can be used alone only one or two or more can be used in combination.

[0089] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0090] In some embodiments, the separator is a solid-state electrolyte layer. The solid-state electrolyte layer is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0091] The solid-state electrolyte layer includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0092] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0093] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0094] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0095] In some embodiments, the electrode assembly is provided with a tab, and the tab can guide current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0096] In some embodiments, the battery cell can include a housing. The housing is used to package components such as the electrode assembly. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0097] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes, the prismatic battery cell including a square battery cell, a blade battery cell, a multi-prismatic battery cell, for example, a hexagonal battery cell, etc.

[0098] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0099] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module.

[0100] As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0101] In some embodiments, the battery apparatus can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0102] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0103] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0104] As an example, the box can include a first box and a second box. The first box and the second box are fastened so that an enclosed space is formed inside the box to accommodate the battery cell assembly. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first box can be a top cover or a bottom plate.

[0105] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are connected to the frame, respectively, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0106] As an example, the box can be a part of a chassis structure of a vehicle. For example, the top cover of the box can be at least a part of a floor of the vehicle, or the frame of the box can be at least a part of a cross beam and a longitudinal beam of the vehicle.

[0107] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box body, at least one side of the box body is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0108] In a solid-state battery cell, an electrode assembly generally includes a first electrode sheet, a second electrode sheet, and a solid-state electrolyte layer, the solid-state electrolyte layer is arranged between the first electrode sheet and the second electrode sheet, the second electrode sheet is opposite in polarity to the first electrode sheet, the first electrode sheet has a first active material region covered with an active material layer, and the second electrode sheet partially exceeds the first active material region of the first electrode sheet to form an excess region. During the forming process of the electrode assembly, the first electrode sheet, the second electrode sheet, and the solid-state electrolyte layer are generally hot-pressed together at a relatively low pressure. In this way, it is difficult to tightly adhere the electrode sheet to the solid-state electrolyte layer, the interface impedance of the electrode sheet and the solid-state electrolyte layer is relatively large, and the energy density is relatively low.

[0109] A higher pressure can be used to hot-press the first electrode sheet, the solid-state electrolyte layer, and the second electrode sheet, so that the electrode sheet and the solid-state electrolyte layer can be tightly adhered, thereby reducing the interface impedance and improving the energy density. However, due to the fact that the second electrode sheet partially exceeds the first electrode sheet to form an excess region, the excess region is prone to bending under high pressure or being sheared under the shearing action of the edge of the first electrode sheet, causing the excess part of the second electrode sheet to be overlapped with the edge region of the first electrode sheet, resulting in a short circuit between the first electrode sheet and the second electrode sheet, and affecting the reliability of the battery cell.

[0110] In view of this, the embodiments of the present application provide a technical solution, which sets an insulating member at the edge region of the first electrode sheet, the insulating member insulates and separates the excess region of the second electrode sheet from the first active material region of the first electrode sheet, thereby reducing the risk of the excess region being overlapped with the first active material region, and reducing the risk of the first electrode sheet being short-circuited with the second electrode sheet, and improving the reliability of the battery cell.

[0111] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery cells and battery devices, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships, and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0112] The following embodiments are described by taking the electric device as a vehicle for example for the convenience of description.

[0113] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000.

[0114] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is configured to control the battery device 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.

[0115] In some embodiments of the present application, the battery device 100 can not only serve as a power source for operating 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.

[0116] Referring to FIG. 2, which is an exploded view of the battery device 100 according to some embodiments of the present application, the battery device 100 can include battery cells 10 and a box 20 configured to accommodate the battery cells 10.

[0117] The box 20 can have various structures. In some embodiments, the box 20 can include a first box 201 and a second box 202, and the first box 201 and the second box 202 can be coupled to each other. The first box 201 and the second box 202 can have various shapes, such as a cuboid, a cylinder, etc. The first box 201 can be a hollow structure with one side open, and the second box 202 can also be a hollow structure with one side open. The open side of the second box 202 can be coupled to the open side of the first box 201, thereby forming the box 20 with a closed space. Alternatively, the first box 201 can be a hollow structure with one side open, and the second box 202 can be a plate structure. The second box 202 can be coupled to the open side of the first box 201, thereby forming the box 20 with an accommodation space.

[0118] In the battery device 100, the battery cells 10 can be one or multiple. If the battery cells 10 are multiple, the multiple battery cells 10 can be connected in series, in parallel or in a mixed manner. The mixed manner means that the multiple battery cells 10 are connected in series and in parallel. The multiple battery cells 10 can be connected in series, in parallel or in a mixed manner to form a battery module, and the multiple battery modules can be connected in series, in parallel or in a mixed manner to form a whole, which is accommodated in the box 20. Alternatively, the multiple battery cells 10 can be directly connected in series, in parallel or in a mixed manner, and the whole formed by the multiple battery cells 10 can be accommodated in the box 20.

[0119] Referring to FIGS. 3-5, FIG. 3 is an exploded view of the battery cell 10 according to some embodiments of the present application; FIG. 4 is an axonometric view of the battery cell 10 shown in FIG. 3; and FIG. 5 is an A-A sectional view of the battery cell 10 shown in FIG. 4. The battery cell 10 can include a casing 1 and an electrode assembly 2 accommodated in the casing 1.

[0120] In some embodiments, the outer shell 1 can include a shell 11 having an opening and an end cover 12 closing the opening of the shell 11. Here, closing means covering or closing, which can be sealed or non-sealed.

[0121] The shell 11 is a component for accommodating the electrode assembly 2, and the shell 11 can be a hollow structure having an opening at one end or a hollow structure having openings at opposite ends. The shell 11 can be in various shapes, such as a cylindrical shape, a cuboid shape, etc. The shell 11 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The electrode assembly 2 can be partially located in the shell 11 or entirely located in the shell 11.

[0122] The end cover 12 cooperates with the shell 11 to define a receiving space for accommodating the electrode assembly 2 and other components. The end cover 12 can be connected to the shell 11 by welding, crimping, etc., to close the opening of the shell 11. The shape of the end cover 12 can be adapted to the shape of the shell 11, such as a rectangular plate structure adapted to the cuboid structure of the shell 11, or a circular plate structure adapted to the cylindrical structure of the shell 11. The end cover 12 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc., and the material of the end cover 12 can be the same as or different from that of the shell 11.

[0123] In embodiments in which the shell 11 has an opening at one end, one end cover 12 can be provided. In embodiments in which the shell 11 has openings at opposite ends, two end covers 12 can be provided, and the two end covers 12 close the two openings of the shell 11, respectively, and cooperates with the shell 11 to define the receiving space.

[0124] In some embodiments, the battery cell 10 can further include an electrode terminal 3 provided on the outer shell 1, and the electrode terminal 3 is used to electrically connect with the tab 21 of the electrode assembly 2 to input or output the electric energy of the battery cell 10. The electrode terminal 3 can be provided on the shell 11 of the outer shell 1 or on the end cover 12 of the outer shell 1. The electrode terminal 3 can be directly connected with the tab 21, such as being welded with the tab 21. The electrode terminal 3 can also be indirectly connected with the tab 21, such as being indirectly connected with the tab 21 through a current collecting member. The current collecting member can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0125] As shown in FIGS. 3-5, for example, the shell 11 has one end formed with an opening, and the battery case 1 has one end cover 12, and one end cover 12 closes one opening of the shell 11. The end cover 12 is provided with two electrode terminals 3, and the two electrode terminals 3 are respectively a positive electrode terminal and a negative electrode terminal. The electrode assembly 2 is formed with a positive electrode tab and a negative electrode tab at one end facing the end cover 12, and the positive electrode terminal is electrically connected to the positive electrode tab, and the negative electrode terminal is electrically connected to the negative electrode tab.

[0126] Please refer to FIGS. 6-8, FIG. 6 is a structural schematic diagram of the electrode assembly 2 provided by some embodiments of the present application; FIG. 7 is a structural schematic diagram of the first tab 22 provided by some embodiments of the present application; and FIG. 8 is a structural schematic diagram of the second tab 23 provided by some embodiments of the present application. The embodiments of the present application provide a battery monomer 10, which includes a battery case 1 and an electrode assembly 2, and the electrode assembly 2 is contained in the battery case 1. The electrode assembly 2 includes a first tab 22, a second tab 23, a solid-state electrolyte layer 24, and an insulating piece 25. The first tab 22 includes a first active material region 221 and a first tab 222 protruding from the first active material region 221. The second tab 23 is opposite in polarity to the first tab 22, and the second tab 23 includes a main body region 231 and an overhanging region 232 beyond the first active material region 221, and the main body region 231 is arranged in a stacking manner with the first active material region 221 along a first direction Z. At least part of the solid-state electrolyte layer 24 is arranged between the first tab 22 and the second tab 23 along the first direction Z; and the insulating piece 25 is arranged at an edge region of the first active material region 221, and the insulating piece 25 is configured to insulate and separate the overhanging region 232 and the first active material region 221.

[0127] The electrode assembly 2 can be a laminated structure, that is, the electrode assembly 2 is a laminated electrode assembly, and the first tab 22, the solid-state electrolyte layer 24, and the second tab 23 are laminated to form a laminated structure, and the lamination direction of the first tab 22, the solid-state electrolyte layer 24, and the second tab 23 is parallel to the first direction Z, and the first tab 22 and the second tab 23 can be in the shape of a circular or rectangular sheet; or the electrode assembly 2 can be a winding structure, that is, the electrode assembly 2 is a winding electrode assembly, and the first tab 22, the solid-state electrolyte layer 24, and the second tab 23 are wound to form a winding structure. In the winding electrode assembly, the electrode assembly 2 can include a flat region and a bending region, and the opposite ends of the flat region can be provided with the bending region, and the lamination direction of the first tab 22, the solid-state electrolyte layer 24, and the second tab 23 located in the flat region is parallel to the first direction Z, and the main body region 231 of the second tab 23 and the first active material region 221 of the first tab 22 are both located in the flat region. In the embodiment shown in FIG. 6, the electrode assembly 2 is a laminated structure.

[0128] One of the first and second pole pieces 22 and 23 is a positive pole piece, and the other is a negative pole piece. It can be understood that the first pole piece 22 can be a positive pole piece, and the second pole piece 23 can be a negative pole piece; or the first pole piece 22 can be a negative pole piece, and the second pole piece 23 can be a positive pole piece. The first pole piece 22 can be one or multiple; and the second pole piece 23 can be one or multiple.

[0129] As shown in FIG. 7, the first pole piece 22 can include a first active material layer 223 and a first current collector 224, the first current collector 224 is provided with the first active material layer 223 on at least one surface in the thickness direction, the region of the first pole piece 22 corresponding to the first active material layer 223 is the first active material region 221, the first active material layer 223 forms part of the first active material region 221, and at least part of the region of the first current collector 224 where the first active material layer 223 is not provided forms the first tab 222. It can be understood that if the first pole piece 22 is a positive pole piece, the first active material layer 223 includes a positive active material; if the first pole piece 22 is a negative pole piece, the first active material layer 223 includes a negative active material. Taking the electrode assembly 2 as a laminated electrode assembly for example, if the first pole piece 22 is one, the first tab 222 of the first pole piece 22 can form one tab 21 of the electrode assembly 2; if the first pole piece 22 is multiple, the first tabs 222 of the multiple first pole pieces 22 can be connected together to form one tab 21 of the electrode assembly 2.

[0130] The exceeding region 232 is a region of the second pole piece 23 exceeding the first active material region 221, and in the projection plane perpendicular to the first direction Z, the orthographic projection of the exceeding region 232 can not overlap with the orthographic projection of the first active material region 221. The exceeding region 232 can be arranged flush with the main body region 231, so that the two surfaces of the exceeding region 232 along the first direction Z are flush with the two surfaces of the main body region 231 along the first direction Z respectively; or the exceeding region 232 can be arranged staggered with the main body region 231, so that the two surfaces of the exceeding region 232 along the first direction Z are staggered with the two surfaces of the main body region 231 along the first direction Z respectively.

[0131] In the embodiment where the electrode assembly 2 is in a wound structure, the at least one end of the main body region 231 along the extension direction of the winding axis of the electrode assembly 2 can be provided with the overhanging region 232, that is, the second tab 23 can overhang at least one end of the first active material region 221 along the extension direction of the winding axis of the electrode assembly 2 to correspondingly form the overhanging region 232. In the embodiment where the electrode assembly 2 is in a stacked structure, if the positive and negative electrode tabs are in a circular sheet structure, the overhanging region 232 can be in an annular structure overhanging the edge of the first active material region 221; if the first and second tabs 22 and 23 are in a rectangular sheet structure, the second tab 23 can overhang at least one edge of the first active material region 221 to correspondingly form the overhanging region 232.

[0132] As shown in FIG. 8, the second tab 23 can include a second active material layer 233 and a second current collector 234, the second current collector 234 is provided with the second active material layer 233 on at least one surface in the thickness direction, and at least a part of the region of the second current collector 234 where the second active material layer 233 is not provided forms the second tab 235. As shown in FIG. 6, after the electrode assembly 2 is formed, a part of the second current collector 234 can be located in the main body region 231, another part can be located in the overhanging region 232, the second tab 235 is located in the overhanging region 232, a part of the second active material layer 233 can be located in the main body region 231, and another part can be located in the overhanging region 232.

[0133] It can be understood that if the second tab 23 is a positive electrode tab, the second active material layer 233 includes a positive electrode active material; if the second tab 23 is a negative electrode tab, the second active material layer 233 includes a negative electrode active material. Taking the electrode assembly 2 as a stacked electrode assembly for example, if the second tab 23 is one, the first tab 222 of the second tab 23 can form one tab 21 of the electrode assembly 2; if the second tab 23 is multiple, the second tabs 235 of the multiple second tabs 23 can be connected together to form one tab 21 of the electrode assembly 2.

[0134] The insulating member 25 is of insulating material, the insulating member 25 is provided in the edge region of the first active material region 221, the insulating member 25 can only be in contact with the first active material region 221, the insulating member 25 and the first active material region 221 are not connected with each other, and the insulating member 25 can also be connected with the first active material layer 223, for example, the insulating member 25 is an insulating adhesive tape adhered to the first active material layer 223. The edge region of the first active material region 221 is the region close to the edge of the first active material region 221.

[0135] In the embodiment of the present application, the edge region of the first active material region 221 is provided with the insulating member 25, the insulating member 25 can insulate and separate the overhanging region 232 of the second pole piece 23 from the first active material region 221 of the first pole piece 22, thereby reducing the risk of the overhanging region 232 and the first active material region 221 being overlapped, reducing the risk of the first pole piece 22 and the second pole piece 23 being short-circuited, and improving the reliability of the battery monomer 10.

[0136] In some embodiments, please refer to FIG. 9 and FIG. 10, FIG. 9 is a partial enlarged view of B in FIG. 6; and FIG. 10 is a partial enlarged view of C in FIG. 6. Along the first direction Z, the first active material region 221 has a first surface 2211 facing the main body region 231, at least part of the overhanging region 232 is located on the side of the first surface 2211 away from the main body region 231, and at least part of the insulating member 25 is located between the overhanging region 232 and the first active material region 221.

[0137] The overhanging region 232 can be entirely located on the side of the first surface 2211 away from the main body region 231, or can be partially located on the side of the first surface 2211 away from the main body region 231. The first surface 2211 is the surface of the first active material layer 223 away from the first current collector 224 along the first direction Z.

[0138] For example, in the embodiment shown in FIG. 9 and FIG. 10, the overhanging region 232 is only partially located on the side of the first surface 2211 away from the main body region 231. It can be understood that the overhanging region 232 exceeds the first surface 2211 in the direction of the main body region 231 pointing to the first active material region 221. The second current collector 234 is connected to the part of the overhanging region 232 located on the main body region 231, and the second active material layer 233 is separated from the part of the overhanging region 232 located on the main body region 231 and is arranged in a staggered manner along the first direction Z.

[0139] The insulating member 25 can be entirely located between the overhanging region 232 and the first active material region 221, or can be only partially located between the overhanging region 232 and the first active material region 221. The first active material region 221 has a side surface located at the edge position thereof, the side surface is connected to the first surface 2211, and a part or all of the side surface can be covered.

[0140] In the embodiment, at least part of the overhanging region 232 is located on the side of the first surface 2211 away from the main body region 231, so that the overhanging region 232 plays a certain protective role for the first active material region 221, reducing the risk of the first active material region 221 being damaged. At least part of the insulating member 25 is located between the overhanging region 232 and the first active material region 221, which can effectively reduce the risk of the overhanging region 232 and the first active material region 221 being overlapped.

[0141] In some embodiments, please continue to refer to FIG. 9 and FIG. 10, the solid-state electrolyte layer 24 includes a first portion 241 and a second portion 242, the first portion 241 and the second portion 242 are arranged in a staggered manner along the first direction Z, the first portion 241 is arranged between the main body region 231 and the first active material region 221, and the second portion 242 is arranged in a stacked manner with the overhanging region 232. Along the first direction Z, the first active material region 221 has a first surface 2211 facing the main body region 231, at least part of the second portion 242 is located on a side of the first surface 2211 away from the main body region 231, and at least part of the insulating member 25 is located between the second portion 242 and the first active material region 221.

[0142] Along the first direction Z, the first portion 241 and the second portion 242 are arranged in a staggered manner, so that the two opposite surfaces of the first portion 241 along the first direction Z are staggered with the two opposite surfaces of the second portion 242 along the first direction Z. The first portion 241 and the second portion 242 can be in a connected state or in a separated state.

[0143] In the second tab 23, each overhanging region 232 can be provided with a second portion 242. The second portion 242 can be located entirely on a side of the first surface 2211 away from the main body region 231, or can be partially located on a side of the first surface 2211 away from the main body region 231. It can be understood that if at least part of the overhanging region 232 is located on a side of the first surface 2211 away from the main body region 231, then the second portion 242 is entirely located on a side of the first surface 2211 away from the main body region 231.

[0144] As an example, in the embodiments shown in FIG. 9 and FIG. 10, the second portion 242 is entirely located on a side of the first surface 2211 away from the main body region 231, and the first portion 241 and the second portion 242 are separated from each other. A part of the insulating member 25 is located between the overhanging region 232 and the first active material region 221, and another part of the insulating member 25 is located between the second portion 242 and the first active material region 221.

[0145] In the present embodiment, the second portion 242 of the solid-state electrolyte layer 24 is arranged in a stacked manner with the overhanging region 232, so that the solid-state electrolyte layer 24 can cover part of the surface of the overhanging region 232, thereby reducing the risk of the overhanging region 232 and the first active material region 221 being overlapped. At least part of the second portion 242 is located on a side of the first surface 2211 away from the main body region 231, and at least part of the insulating member 25 is located between the second portion 242 and the first active material region 221, so that the insulating member 25 can cover more areas of the side surface of the first active material region 221 connected with the first surface 2211, thereby reducing the risk of the overhanging region 232 and the side surface of the first active material region 221 being overlapped.

[0146] In some embodiments, at least part of the insulating member 25 is located between the first active material region 221 and the host region 231 along the first direction Z.

[0147] The part of the insulating member 25 located between the first active material region 221 and the host region 231 can be located between the first active material region 221 and the solid electrolyte layer 24, or between the host region 231 and the solid electrolyte layer 24.

[0148] It can be understood that, in embodiments where at least part of the insulating member 25 is located between the overhanging region 232 and the first active material region 221, the insulating member 25 is only partially located between the first active material region 221 and the host region 231.

[0149] The part of the insulating member 25 located between the first active material region 221 and the host region 231 can function to separate the first active material region 221 and the host region 231, reducing the risk of the edge region of the first active material region 221 overlapping the host region 231.

[0150] In some embodiments, please continue to refer to FIGS. 9 and 10, the part of the insulating member 25 located between the first active material region 221 and the host region 231 is connected to the side of the first active material region 221 facing the host region 231 along the first direction Z.

[0151] The part of the insulating member 25 located between the first active material region 221 and the host region 231 can be connected to the first surface 2211, or a recess can be provided on the first surface 2211 to accommodate the part of the insulating member 25 located between the first active material region 221 and the host region 231. As an example, the part of the insulating member 25 located between the first active material region 221 and the host region 231 is bonded to the side of the first active material region 221 facing the host region 231.

[0152] In the present embodiment, the part of the insulating member 25 located between the first active material region 221 and the host region 231 is connected to the side of the first active material region 221 facing the host region 231, so that the insulating member 25 is connected to the first active material region 221, improving the firmness of the insulating member 25 and reducing the risk of the insulating member 25 detaching.

[0153] In some embodiments, the host region 231 is provided with an overhanging region 232 along the second direction Y, and the first active material region 221 is provided with the insulating member 25 near the end of the overhanging region 232 along the second direction Y, the second direction Y being perpendicular to the first direction Z.

[0154] It can be understood that the second tab 23 can extend beyond at least one end of the first active material area 221 in the second direction Y to correspondingly form an overhang area 232. In the second direction Y, the main body area 231 can be provided with the overhang area 232 at only one end, and the first active material area 221 is provided with the insulating member 25 at one end in the second direction Y; as shown in FIGS. 9 and 10, in the second direction Y, the main body area 231 can be provided with the overhang area 232 at both ends, and the first active material area 221 is provided with the insulating member 25 at both ends in the second direction Y.

[0155] The end of the first active material area 221 close to the end of the overhang area 232 in the second direction Y belongs to the edge region of the first active material area 221. In the second direction Y, the end face of the end of the first active material area 221 is the side surface of the first active material area 221.

[0156] In the embodiment in which the electrode assembly 2 is in a jelly-roll structure, the second direction Y can be parallel to the extension direction of the winding axis of the electrode assembly 2; in the embodiment in which the electrode assembly 2 is in a stack structure, if the first tab 22 and the second tab 23 are in a rectangular sheet structure, the second direction Y can be parallel to the length direction or the width direction of the first tab 22.

[0157] In the present embodiment, the main body area 231 is provided with the overhang area 232 at at least one end in the second direction Y, and the first active material area 221 is provided with the insulating member 25 at the end close to the overhang area 232 in the second direction Y, which can reduce the risk of the overhang area 232 and the first active material area 221 being overlapped in the second direction Y, thereby reducing the risk of short circuit between the first tab 22 and the second tab 23.

[0158] In some embodiments, please refer to FIGS. 9-11, FIG. 11 is a structural schematic view of the insulating member 25 shown in FIG. 9. In the first direction Z, the first tab 22 is provided with the second tab 23 on both sides. The first active material area 221 is provided with two insulating members 25 at the end close to the overhang area 232 in the second direction Y, and the insulating member 25 provided at at least one end of the first active material area 221 in the second direction Y includes a first insulating portion 251, a second insulating portion 252 and a third insulating portion 253 connected in sequence. In the first direction Z, at least part of the first insulating portion 251 is arranged between the first active material area 221 and the main body area 231, and at least part of the third insulating portion 253 is arranged between the overhang areas 232 of the two adjacent second tabs 23. In the second direction Y, at least part of the second insulating portion 252 is arranged between the first active material area 221 and the overhang area 232.

[0159] Note that in the embodiment in which the insulating members 25 are provided at both ends of the first active material region 221 in the second direction Y, in the second direction Y, the insulating member 25 provided at one end of the first active material region 221 can have the above-described structure, or the insulating members 25 provided at both ends of the first active material region 221 can have the above-described structure. As an example, in the embodiment illustrated in FIGS. 9 and 10, the insulating members 25 provided at both ends of the first active material region 221 have the above-described structure.

[0160] In the first direction Z, the first insulating portion 251 can be provided only partially between the first active material region 221 and the main body region 231, or can be provided entirely between the first active material region 221 and the main body region 231, and the third insulating portion 253 can be provided only partially between the overhanging regions 232 of the two adjacent second tabs 23, or can be provided entirely between the overhanging regions 232 of the two adjacent second tabs 23. In the second direction Y, the second insulating portion 252 can be provided only partially between the first active material region 221 and the overhanging region 232, or can be provided entirely between the first active material region 221 and the overhanging region 232.

[0161] It will be understood that, of the two insulating members 25 provided at the same end of the first active material region 221 in the second direction Y, in the first direction Z, at least a portion of the first insulating portion 251 of one insulating member 25 is provided between the first active material region 221 and the main body region 231 of one second tab 23, and at least a portion of the first insulating portion 251 of the other insulating member 25 is provided between the first active material region 221 and the main body region 231 of the other second tab 23, and the third insulating portion 253 of both insulating members 25 is at least partially provided between the overhanging regions 232 of the two adjacent second tabs 23. In the second direction Y, at least a portion of the second insulating portion 252 of one insulating member 25 is provided between the first active material region 221 and the overhanging region 232 of one second tab 23, and at least a portion of the second insulating portion 252 of the other insulating member 25 is provided between the first active material region 221 and the overhanging region 232 of the other second tab 23.

[0162] In the embodiment in which the solid electrolyte layer 24 includes the first portion 241 and the second portion 242 arranged in the first direction Z, along the first direction Z, the first insulating part 251 can be arranged between the first portion 241 of the solid electrolyte layer 24 and the first active material area 221, or between the first portion 241 of the solid electrolyte layer 24 and the main body area 231, and the third insulating part 253 can be arranged between two adjacent second portions 242; along the second direction Y, a part of the second insulating part 252 is arranged between the first active material area 221 and the overhanging area 232, and another part of the second insulating part 252 is arranged between the first active material area 221 and the second portion 242.

[0163] It should be noted that, among the two insulating parts 25 arranged at the same end of the first active material area 221 along the second direction Y, the two third insulating parts 253 of the two insulating parts 25 can be arranged in a spaced manner, can only be in contact with each other without being connected to each other, can be connected to each other, or can be partially arranged in a spaced manner and partially connected to each other.

[0164] As an example, the first insulating part 251, the second insulating part 252, and the third insulating part 253 can be integrally formed, and the first insulating part 251, the second insulating part 252, and the third insulating part 253 can form a “Z” shaped structure.

[0165] In the present embodiment, by arranging two insulating parts 25 at the end of the first active material area 221 along the second direction Y close to the overhanging area 232, the overhanging area 232 of the second tab 23 located on both sides of the first tab 22 can be insulated from the first active material area 221 of the first tab 22 along the second direction Y, and the overhanging area 232 of two adjacent second tabs 23 along the second direction Y can be separated, thereby reducing the risk of mutual influence of the overhanging area 232. The insulating part 25 of this structure has lower requirements for dimensional accuracy and higher installation efficiency. In addition, since at least part of the second insulating part 252 of the insulating part 25 is arranged between the first active material area 221 and the overhanging area 232 along the second direction Y, the second insulating part 252 not only separates the first active material area 221 and the overhanging area 232, but also reduces the risk of contact between burrs generated at the end of the first active material area 221 along the second direction Y during molding and the overhanging area 232, thereby further reducing the risk of short circuit between the first tab 22 and the second tab 23.

[0166] In some embodiments, please continue to refer to FIGS. 9 and 10, along the first direction Z, the first insulating part 251 of the two insulating parts 25 is connected to the opposite sides of the first active material area 221, respectively.

[0167] As an example, along the first direction Z, the first active material region 221 has two opposite first surfaces 2211, both of which are provided with recesses, among the two insulating members 25 provided at the same end of the first active material region 221 along the second direction Y, the first insulating portions 251 of the two insulating members 25 are respectively accommodated in the recesses of the two first surfaces 2211, so that the surfaces of the first insulating portions 251 facing the surface of the body region 231 are flush with the first surfaces 2211. The first insulating portions 251 of the two insulating members 25 are respectively bonded to the opposite sides of the first active material region 221.

[0168] In the present embodiment, the first insulating portions 251 of the two insulating members 25 are respectively connected to the opposite sides of the first active material region 221, so that the two insulating members 25 are respectively connected to the opposite sides of the first active material region 221, improving the firmness of the insulating member 25 and reducing the risk of disengagement of the insulating member 25. During the preparation of the electrode assembly 2, the first insulating portions 251 of the two insulating members 25 can be respectively connected to the opposite sides of the first active material region 221 first, and then the two insulating members 25 are fixed at the end of the first active material region 221 along the second direction Y, and then the first tab 22, the solid electrolyte layer 24 and the second tab 23 are stacked, which can effectively reduce the installation difficulty of the insulating member 25.

[0169] In some embodiments, please continue to refer to FIG. 10, the third insulating portions 253 of the two insulating members 25 provided at at least one end of the first active material region 221 along the second direction Y are connected to each other.

[0170] The third insulating portions 253 of the two insulating members 25 provided at one end of the first active material region 221 along the second direction Y can be connected to each other, or the third insulating portions 253 of the two insulating members 25 provided at both ends of the first active material region 221 along the second direction Y can be connected to each other.

[0171] As an example, the third insulating portions 253 of the two insulating members 25 are bonded to each other.

[0172] In the present embodiment, the third insulating walls of the two insulating members 25 are connected to each other, so that the two insulating members 25 form an integral whole to keep the second insulating portions 252 of the two insulating members 25 between the first active material region 221 and the overhanging region 232, and the two insulating members 25 cooperate to cover more areas of the end surface of the first active material region 221 along the second direction Y, reducing the risk of the overhanging region 232 and the end surface of the first active material region 221 overlapping.

[0173] In some embodiments, please continue to refer to FIG. 9, along the second direction Y, at least one end of the first active material area 221 is provided with the first tab 222. In the insulating member 25 provided at the end of the first active material area 221 close to the first tab 222 along the second direction Y, along the first direction Z, at least a part of the third insulating portion 253 is located between the first tab 222 and the overhanging area 232.

[0174] In the insulating member 25 provided at the end of the first active material area 221 close to the first tab 222 along the second direction Y, along the first direction Z, the third insulating portion 253 can be only a part of the first tab 222 and the overhanging area 232, or all of the first tab 222 and the overhanging area 232.

[0175] As an example, along the second direction Y, only one end of the first active material area 221 is provided with the first tab 222, and in the two insulating members 25 provided at the end of the first active material area 221 close to the first tab 222 along the second direction Y, a part of the two insulating members 25 is separated by the first tab 222, and a part of the two insulating members 25 is connected to each other.

[0176] In this embodiment, the third insulating portion 253 can play a role in separating the first tab 222 and the overhanging area 232, reducing the risk of the overhanging area 232 and the first tab 222 being overlapped, and causing the first tab 22 and the second tab 23 to be short-circuited.

[0177] In some embodiments, please continue to refer to FIG. 9 and FIG. 10, along the second direction Y, the third insulating portion 253 exceeds the end of the overhanging area 232 away from the main body area 231.

[0178] As an example, along the second direction Y, the size of the third insulating portion 253 is greater than the size of the overhanging area 232, so that the third insulating portion 253 exceeds the end of the overhanging area 232 away from the main body area 231.

[0179] In this embodiment, the third insulating portion 253 has a larger size along the second direction Y, which increases the insulation range of the third insulating portion 253 in the second direction Y, and further enhances the insulation capability of the third insulating portion 253.

[0180] In some embodiments, referring to FIGS. 12-14, FIG. 12 is a structural schematic diagram of an electrode assembly 2 according to some embodiments of the present application; FIG. 13 is an enlarged view of a portion D in FIG. 12; and FIG. 14 is a structural schematic diagram of the insulating member 25 shown in FIG. 13. Along the first direction Z, the first electrode tab 22 is provided with the second electrode tab 23 on both sides. The insulating member 25 provided at at least one end of the first active material area 221 along the second direction Y includes a second insulating portion 252 and two first insulating portions 251, and the second insulating portion 252 connects the two first insulating portions 251. Along the first direction Z, at least a portion of one first insulating portion 251 is provided between the first active material area 221 and the main body area 231 of one second electrode tab 23, and at least a portion of the other first insulating portion 251 is provided between the first active material area 221 and the main body area 231 of the other second electrode tab 23; along the second direction Y, at least a portion of the second insulating portion 252 is provided between the first active material area 221 and the overhanging area 232.

[0181] It should be noted that in the embodiments in which the insulating member 25 is provided at both ends of the first active material area 221 along the second direction Y, along the second direction Y, the insulating member 25 provided at one end of the first active material area 221 can have the above structure, or the insulating members 25 provided at both ends of the first active material area 221 can have the above structure. As an example, along the first direction Z, the first active material area 221 is provided with the first electrode lug 222 at only one end, the insulating member 25 provided at one end of the first active material area 221 away from the first electrode lug 222 has the structure of the insulating member 25 shown in FIG. 13, and the insulating member 25 provided at one end of the first active material area 221 close to the first electrode lug 222 has the structure of the insulating member 25 shown in FIG. 9.

[0182] Along the first direction Z, at least a portion of one first insulating portion 251 can be provided between the first active material area 221 and the main body area 231 of one second electrode tab 23, or all of the first insulating portion 251 can be provided between the first active material area 221 and the main body area 231 of one second electrode tab 23; at least a portion of the other first insulating portion 251 can be provided between the first active material area 221 and the main body area 231 of the other second electrode tab 23, or all of the first insulating portion 251 can be provided between the first active material area 221 and the main body area 231 of the other second electrode tab 23; along the second direction Y, at least a portion of the second insulating portion 252 can be provided between the first active material area 221 and the overhanging area 232, or all of the second insulating portion 252 can be provided between the first active material area 221 and the overhanging area 232. The second insulating portion 252 can cover a portion of the end face of the end of the first active material area 221 along the second direction Y, or can cover the entire end face of the end of the first active material area 221 along the second direction Y.

[0183] In the embodiment in which the solid electrolyte layer 24 includes the first portion 241 and the second portion 242 arranged offset along the first direction Z, along the first direction Z, the first insulating part 251 can be arranged between the first portion 241 of the solid electrolyte layer 24 and the first active material area 221, or between the first portion 241 of the solid electrolyte layer 24 and the main body area 231; along the second direction Y, the second insulating part 252 has a portion arranged between the first active material area 221 and the overhanging area 232, and the second insulating part 252 also has a portion arranged between the first active material area 221 and the second portion 242.

[0184] The second insulating part 252 and the two first insulating parts 251 can be integrally formed, and one first insulating part 251, the second insulating part 252, and the other first insulating part 251 can be sequentially connected to form a "U"-shaped structure.

[0185] In the present embodiment, the insulating member 25 can achieve the insulation and isolation of the second electrode tab 23 on both sides of the first electrode tab 22 from the first active material area 221 of the first electrode tab 22 along the second direction Y, and the structure is simple, and the use of the insulating member 25 is reduced. In addition, since at least a portion of the second insulating part 252 of the insulating member 25 is arranged between the first active material area 221 and the overhanging area 232 along the second direction Y, the second insulating part 252 can not only separate the first active material area 221 and the overhanging area 232, but also can separate the risk of contact between burrs generated during molding of the end of the first active material area 221 along the second direction Y and the overhanging area 232, thereby reducing the risk of short circuit between the first electrode tab 22 and the second electrode tab 23.

[0186] In some embodiments, please continue to refer to 13, along the first direction Z, the two first insulating parts 251 of the insulating member 25 are respectively connected to the opposite sides of the first active material area 221.

[0187] As an example, along the first direction Z, the first active material area 221 has two opposite first surfaces 2211, both of which are provided with recesses, and the two first insulating parts 251 of the insulating member 25 are respectively accommodated in the recesses of the two first surfaces 2211, so that the surface of the first insulating part 251 facing the main body area 231 is flush with the first surface 2211. The two first insulating parts 251 of the insulating member 25 are respectively bonded to the opposite sides of the first active material area 221.

[0188] In the embodiment, the two first insulation portions 251 of the insulation member 25 are respectively connected to the two opposite sides of the first active material area 221, which improves the firmness of the insulation member 25 and reduces the risk of disengagement of the insulation member 25. In the process of manufacturing the electrode assembly 2, the two first insulation portions 251 of the insulation member 25 can be respectively connected to the two opposite sides of the first active material area 221 first, and then the first tab 22, the solid electrolyte layer 24, and the second tab 23 are stacked after the insulation member 25 is fixed at the end of the first active material area 221 along the second direction Y, which can effectively reduce the installation difficulty of the insulation member 25.

[0189] In some embodiments, please continue to refer to FIGS. 9, 10, and 13, the size of the first insulation portion 251 along the second direction Y is L1, and 0.1mm≤L1≤10mm.

[0190] L1 can take any one of the point values of 0.1mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, or a range value between any two of them.

[0191] L1≥0.1mm, so that the first insulation portion 251 has a sufficient size along the second direction Y, which is conducive to enhancing the firmness of the insulation member 25 and reducing the risk of disengagement of the insulation member 25; and L1≤10mm, so that the size of the first insulation portion 251 along the second direction Y is not too large, which on the one hand reduces the influence of the first insulation portion 251 on the transmission of active ions between the first tab 22 and the second tab 23, and on the other hand reduces the material of the first insulation portion 251, which has better economy.

[0192] In some embodiments, 2mm≤L1≤8mm.

[0193] L1 can take any one of the point values of 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mm, 4.8mm, 5mm, 5.3mm, 5.5mm, 5.8mm, 6mm, 6.3mm, 6.5mm, 6.8mm, 7mm, 7.3mm, 7.5mm, 7.8mm, 8mm, or a range value between any two of them.

[0194] In the embodiment, 2mm≤L1≤8mm, which further takes into account the firmness and economy of the insulation member 25.

[0195] In some embodiments, please continue to refer to FIG. 6 and FIG. 12, the main body area 231 is provided with an overhanging area 232 at each end in the second direction Y, and the first active material area 221 is provided with an insulating member 25 at each end in the second direction Y.

[0196] It can be understood that the two ends of the first active material area 221 in the second direction Y belong to the edge region of the first active material area 221.

[0197] The above structure can reduce the risk of the second tab 23 being overlapped with the first active material area 221 at the two overhanging areas 232 in the second direction Y, thereby reducing the risk of short circuit between the first tab 22 and the second tab 23.

[0198] In some embodiments, please refer to FIG. 15, which is a structural schematic diagram of an electrode assembly 2 provided in some embodiments of the present application. The main body area 231 is provided with an overhanging area 232 at at least one end in the third direction X, and the first active material area 221 is provided with an insulating member 25 at the end close to the overhanging area 232 in the third direction X. The first direction Z and the second direction Y are both perpendicular to the third direction X.

[0199] It can be understood that the second tab 23 can extend beyond at least one end of the first active material area 221 in the third direction X to correspondingly form the overhanging area 232. In the third direction X, the main body area 231 can be provided with an overhanging area 232 at only one end, and the first active material area 221 can be provided with an insulating member 25 at one end in the third direction X; as shown in FIG. 15, in the third direction X, the main body area 231 can also be provided with an overhanging area 232 at both ends, and the first active material area 221 can be provided with an insulating member 25 at both ends in the third direction X.

[0200] The end of the first active material area 221 close to the overhanging area 232 in the third direction X belongs to the edge region of the first active material area 221. In the third direction X, the end face of the end of the first active material area 221 is the side surface of the first active material area 221.

[0201] For example, the electrode assembly 2 is a laminated structure, the first tab 22 and the second tab 23 are rectangular sheet structures, the first direction Z is parallel to the thickness direction of the first tab 22, and one of the second direction Y and the third direction X can be parallel to the length direction of the first tab 22, and the other can be parallel to the width direction of the first tab 22.

[0202] In the embodiment, the body region 231 is provided with the overhanging region 232 at at least one end in the third direction X, and the first active material region 221 is provided with the insulating member 25 at the end close to the overhanging region 232 in the third direction X, so that the risk of the overhanging region 232 and the first active material region 221 being overlapped in the third direction X is reduced, and the risk of the first electrode tab 22 and the second electrode tab 23 being short-circuited is reduced.

[0203] In some embodiments, referring to FIG. 16, which is a schematic structural view of the position E in FIG. 15. In the first direction Z, the first electrode tab 22 is provided with the second electrode tab 23 on both sides; the first active material region 221 is provided with two insulating members 25 at the end close to the overhanging region 232 in the third direction X, and the insulating member 25 provided at at least one end of the first active material region 221 in the third direction X comprises the fourth insulating part 254, the fifth insulating part 255 and the sixth insulating part 256 connected in sequence. In the first direction Z, at least part of the fourth insulating part 254 is arranged between the first active material region 221 and the body region 231, and at least part of the sixth insulating part 256 is arranged between the overhanging regions 232 of the two adjacent second electrode tabs 23. In the third direction X, at least part of the fifth insulating part 255 is arranged between the first active material region 221 and the overhanging region 232.

[0204] It should be noted that in the embodiment in which the first active material region 221 is provided with the insulating member 25 at both ends in the third direction X, the insulating member 25 provided at one end of the first active material region 221 in the third direction X can have the above structure, or the insulating members 25 provided at both ends of the first active material region 221 in the third direction X can both have the above structure. As an example, in the embodiment shown in FIG. 16, the insulating members 25 provided at both ends of the first active material region 221 both have the above structure.

[0205] In the first direction Z, the fourth insulating part 254 can be only partially arranged between the first active material region 221 and the body region 231, or can be entirely arranged between the first active material region 221 and the body region 231, and the sixth insulating part 256 can be only partially arranged between the overhanging regions 232 of the two adjacent second electrode tabs 23, or can be entirely arranged between the overhanging regions 232 of the two adjacent second electrode tabs 23; in the third direction X, the fifth insulating part 255 can be only partially arranged between the first active material region 221 and the overhanging region 232, or can be entirely arranged between the first active material region 221 and the overhanging region 232.

[0206] It can be understood that, in the two insulating pieces 25 arranged at the same end of the first active material area 221 along the third direction X, at least part of the fourth insulating part 254 of one insulating piece 25 is arranged between the first active material area 221 and the main body area 231 of one second pole piece 23 along the first direction Z, at least part of the fourth insulating part 254 of the other insulating piece 25 is arranged between the first active material area 221 and the main body area 231 of the other second pole piece 23, and the sixth insulating part 256 of the two insulating pieces 25 is at least partially arranged in the overhanging area 232 of the two adjacent second pole pieces 23; along the third direction X, at least part of the fifth insulating part 255 of one insulating piece 25 is arranged between the first active material area 221 and the overhanging area 232 of one second pole piece 23, and at least part of the fifth insulating part 255 of the other insulating piece 25 is arranged between the first active material area 221 and the overhanging area 232 of the other second pole piece 23.

[0207] In the embodiment in which the solid electrolyte layer 24 includes the first part 241 and the second part 242 arranged staggered along the first direction Z, along the first direction Z, the fourth insulating part 254 can be arranged between the first part 241 of the solid electrolyte layer 24 and the first active material area 221, or between the first part 241 of the solid electrolyte layer 24 and the main body area 231, and the sixth insulating part 256 can be arranged between the two adjacent second parts 242; along the third direction X, part of the fifth insulating part 255 is arranged between the first active material area 221 and the overhanging area 232, and part of the fifth insulating part 255 is arranged between the first active material area 221 and the second part 242.

[0208] It should be noted that, in the two insulating pieces 25 arranged at the same end of the first active material area 221 along the third direction X, the two sixth insulating parts 256 of the two insulating pieces 25 can be arranged spaced apart, or can only be in contact with each other but not connected to each other, or can be connected together, or a part can be arranged spaced apart and the other part can be connected together.

[0209] As an example, the fourth insulating part 254, the fifth insulating part 255 and the sixth insulating part 256 can be integrally formed, and the fourth insulating part 254, the fifth insulating part 255 and the sixth insulating part 256 can form a "Z" shaped structure.

[0210] In the embodiment, by arranging two insulating members 25 at the end of the overhanging region 232 of the first active material region 221 along the third direction X, the overhanging region 232 of the second electrode tab 23 on both sides of the first electrode tab 22 along the third direction X can be insulated from the first active material region 221 of the first electrode tab 22, and the overhanging region 232 of the two adjacent second electrode tabs 23 along the third direction X can be separated, reducing the risk of mutual influence of the overhanging region 232. The insulating member 25 of the structure has lower requirements for dimensional accuracy and higher installation efficiency. In addition, since at least part of the fifth insulating part 255 of the insulating member 25 is arranged between the first active material region 221 and the overhanging region 232 along the third direction X, the fifth insulating part 255 can not only separate the first active material region 221 and the overhanging region 232, but also reduce the risk of contact between burrs generated at the end of the first active material region 221 along the third direction X during molding and the overhanging region 232, thereby reducing the risk of short circuit between the first electrode tab 22 and the second electrode tab 23.

[0211] In some embodiments, please continue to refer to FIG. 16, along the first direction Z, the fourth insulating part 254 of the two insulating members 25 is respectively connected to the opposite sides of the first active material region 221.

[0212] As an example, along the first direction Z, the first active material region 221 has two opposite first surfaces 2211, both of which are provided with recesses, and in the two insulating members 25 arranged at the same end of the first active material region 221 along the third direction X, the fourth insulating part 254 of the two insulating members 25 is respectively accommodated in the recess of the two first surfaces 2211, so that the surface of the fourth insulating part 254 facing the main body region 231 is flush with the first surface 2211. The fourth insulating part 254 of the two insulating members 25 is respectively bonded to the opposite sides of the first active material region 221.

[0213] In the embodiment, the fourth insulating part 254 of the two insulating members 25 is respectively connected to the opposite sides of the first active material region 221, so that the two insulating members 25 are respectively connected to the opposite sides of the first active material region 221, improving the firmness of the insulating member 25 and reducing the risk of disengagement of the insulating member 25. During the preparation of the electrode assembly 2, the fourth insulating part 254 of the two insulating members 25 can be respectively connected to the opposite sides of the first active material region 221 first, and then the first electrode tab 22, the solid electrolyte layer 24 and the second electrode tab 23 are stacked after the two insulating members 25 are fixed at the end of the first active material region 221 along the third direction X, which can effectively reduce the installation difficulty of the insulating member 25.

[0214] In some embodiments, please continue to refer to FIG. 16, the sixth insulating part 256 of the two insulating members 25 arranged at at least one end of the first active material region 221 along the third direction X is connected to each other.

[0215] The third insulating portions 253 of the two insulating members 25 disposed at one end of the first active material region 221 along the third direction X can be connected to each other, or the third insulating portions 253 of the two insulating members 25 disposed at both ends of the first active material region 221 along the third direction X can be connected to each other.

[0216] As an example, the sixth insulating portions 256 of the two insulating members 25 are bonded to each other.

[0217] In this embodiment, the sixth insulating portions 256 of the two insulating members 25 are connected to each other, so that the two insulating members 25 form an integral whole, to keep the fifth insulating portions 255 of the two insulating members 25 between the first active material region 221 and the overhanging region 232, and the two insulating members 25 can cover more areas of the end surface of the first active material region 221 along the third direction X, reducing the risk of the overhanging region 232 and the end surface of the first active material region 221 being overlapped.

[0218] In some embodiments, please continue to refer to FIG. 16, along the third direction X, the sixth insulating portion 256 is beyond the end of the overhanging region 232 away from the main body region 231.

[0219] As an example, along the third direction X, the size of the sixth insulating portion 256 is greater than the size of the overhanging region 232, so that the sixth insulating portion 256 is beyond the end of the overhanging region 232 away from the main body region 231.

[0220] In this embodiment, the sixth insulating portion 256 has a larger size along the third direction X, which increases the insulating range of the sixth insulating portion 256 along the third direction X, and further enhances the insulating capability of the sixth insulating portion 256.

[0221] In some embodiments, please refer to FIG. 17 and FIG. 18, FIG. 17 is a structural schematic diagram of an electrode assembly 2 provided by some embodiments of the present application; and FIG. 18 is a structural schematic diagram of F in FIG. 17. Along the first direction Z, the two sides of the first tab 22 are both provided with the second tab 23; the insulating member 25 disposed at at least one end of the first active material region 221 along the third direction X includes the fifth insulating portion 255 and two fourth insulating portions 254, and the fifth insulating portion 255 connects the two fourth insulating portions 254. Along the first direction Z, at least part of one fourth insulating portion 254 is disposed between the first active material region 221 and the main body region 231 of one second tab 23, and at least part of the other fourth insulating portion 254 is disposed between the first active material region 221 and the main body region 231 of the other second tab 23; along the third direction X, at least part of the fifth insulating portion 255 is disposed between the first active material region 221 and the overhanging region 232.

[0222] Note that in the embodiment in which the insulating member 25 is provided at both ends of the first active material region 221 in the third direction X, the insulating member 25 provided at one end of the first active material region 221 in the third direction X can have the above-described structure, and the insulating member 25 provided at both ends of the first active material region 221 in the third direction X can have the above-described structure. In some embodiments, the insulating member 25 provided at one end of the first active material region 221 has the structure of the insulating member 25 shown in FIG. 16, and the insulating member 25 provided at the other end of the first active material region 221 has the structure of the insulating member 25 shown in FIG. 18. In other embodiments, the insulating member 25 provided at both ends of the first active material region 221 has the structure of the insulating member 25 shown in FIG. 18.

[0223] In the first direction Z, one fourth insulating portion 254 can be provided only partially between the first active material region 221 and the main body region 231 of one second tab 23, or can be provided entirely between the first active material region 221 and the main body region 231 of one second tab 23, and the other fourth insulating portion 254 can be provided only partially between the first active material region 221 and the main body region 231 of the other second tab 23, or can be provided entirely between the first active material region 221 and the main body region 231 of the other second tab 23. In the third direction X, the fifth insulating portion 255 can be provided only partially between the first active material region 221 and the excess region 232, or can be provided entirely between the first active material region 221 and the excess region 232. The fifth insulating portion 255 can cover a portion of the end surface of the end of the first active material region 221 in the third direction X, or can cover the entire end surface of the end of the first active material region 221 in the third direction X.

[0224] In the embodiment in which the solid-state electrolyte layer 24 includes the first portion 241 and the second portion 242 that are misaligned in the first direction Z, in the first direction Z, the fourth insulating portion 254 can be provided between the first portion 241 of the solid-state electrolyte layer 24 and the first active material region 221, or can be provided between the first portion 241 of the solid-state electrolyte layer 24 and the main body region 231. In the third direction X, the fifth insulating portion 255 is partially provided between the first active material region 221 and the excess region 232, and the fifth insulating portion 255 is also partially provided between the first active material region 221 and the second portion 242.

[0225] The fifth insulating portion 255 and the two fourth insulating portions 254 can be integrally formed, and one fourth insulating portion 254, the fifth insulating portion 255, and the other fourth insulating portion 254 can be sequentially connected to form a "U"-shaped structure.

[0226] In the embodiment, the insulating member 25 can achieve insulation isolation of the overhanging region 232 of the second electrode tab 23 on both sides of the first electrode tab 22 from the first active material region 221 of the first electrode tab 22 in the third direction X, and the structure is simple, and the use of the insulating member 25 is reduced. In addition, since at least part of the fifth insulating part 255 of the insulating member 25 is arranged between the first active material region 221 and the overhanging region 232 in the third direction X, the fifth insulating part 255 can not only separate the first active material region 221 and the overhanging region 232, but also reduce the risk of the burr generated at the end of the first active material region 221 in the third direction X contacting the overhanging region 232 during molding, thereby reducing the risk of short circuit between the first electrode tab 22 and the second electrode tab 23.

[0227] In some embodiments, along the first direction Z, the two fourth insulating parts 254 of the insulating member 25 are respectively connected to the opposite sides of the first active material region 221.

[0228] For example, along the first direction Z, the first active material region 221 has two opposite first surfaces 2211, both of which are provided with recesses, and the two fourth insulating parts 254 of the insulating member 25 are respectively accommodated in the recesses of the two first surfaces 2211, so that the surface of the fourth insulating part 254 facing the main body region 231 is flush with the first surface 2211. The two fourth insulating parts 254 of the insulating member 25 are respectively bonded to the opposite sides of the first active material region 221.

[0229] In the embodiment, the two fourth insulating parts 254 of the insulating member 25 are respectively connected to the opposite sides of the first active material region 221, which improves the firmness of the insulating member 25 and reduces the risk of disengagement of the insulating member 25. During preparation of the electrode assembly 2, the two fourth insulating parts 254 of the insulating member 25 can be respectively connected to the opposite sides of the first active material region 221 first, and then the insulating member 25 is fixed at the end of the first active material region 221 in the third direction X, and then the first electrode tab 22, the solid electrolyte layer 24 and the second electrode tab 23 are stacked, which can effectively reduce the installation difficulty of the insulating member 25.

[0230] In some embodiments, please continue to refer to FIGS. 16 and 18, the fourth insulating part 254 has a size L2 in the third direction X, and 0.1mm≤L2≤10mm.

[0231] L2 can take any one of 0.1mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, or a range value between any two thereof.

[0232] L2≥0.1mm, so that the fourth insulation part 254 has sufficient size along the third direction X, which is conducive to enhancing the firmness of the insulation part 25 and reducing the risk of the insulation part 25 coming off; L2≤10mm, so that the size of the fourth insulation part 254 along the third direction X is not too large, on the one hand, reducing the influence of the first insulation part 251 on the transmission of active ions between the first and second pole pieces 22 and 23, and on the other hand, reducing the material use of the first insulation part 251 and having better economy.

[0233] In some embodiments, 2mm≤L2≤8mm.

[0234] L2 can take any one of the following values or a range value between any two of them: 2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.5mm, 4.8mm, 5mm, 5.3mm, 5.5mm, 5.8mm, 6mm, 6.3mm, 6.5mm, 6.8mm, 7mm, 7.3mm, 7.5mm, 7.8mm, 8mm, etc.

[0235] In this embodiment, 2mm≤L2≤8mm, further taking into account the firmness and economy of the insulation part 25.

[0236] In some embodiments, please continue to refer to FIGS. 15 and 17, the main body area 231 is provided with an overhanging area 232 at each of the two opposite ends along the third direction X, and the first active material area 221 is provided with an insulation part 25 at each of the two opposite ends along the third direction X.

[0237] It can be understood that the two opposite ends of the first active material area 221 along the third direction X both belong to the edge region of the first active material area 221.

[0238] The above structure can reduce the risk of the two overhanging areas 232 of the second pole piece 23 along the third direction X being overlapped with the first active material area 221, thereby reducing the risk of short circuit between the first and second pole pieces 22 and 23.

[0239] In some embodiments, the first pole piece 22 is a positive pole piece, and the second pole piece 23 is a negative pole piece.

[0240] Taking the electrode assembly 2 with a stack structure as an example, the second pole piece 23 can be one more than the first pole piece 22, and one first pole piece 22 is arranged between adjacent second pole pieces 23. For the two second pole pieces 23 at the two ends along the first direction Z in the electrode assembly 2, the solid-state electrolyte layer 24 can be arranged on the side of the second pole piece 23 facing the first pole piece 22 along the first direction Z, or the solid-state electrolyte layer 24 can be arranged on both sides of the second pole piece 23 along the first direction Z.

[0241] In the case where the second tab 23 is a negative electrode tab, the second tab 23 can only include a second current collector 234, which can be a metal foil, a foamed metal, or a composite current collector, etc., or the second tab 23 can include the second current collector 234 and a second active material layer 233, the second current collector 234 being provided with the second active material layer 233 on at least one surface in the thickness direction.

[0242] In the present embodiment, the negative electrode tab has an overhanging region 232 that exceeds the positive electrode tab, and the metal ions (such as lithium ions) released by the positive electrode tab during charging can be more readily accepted by the negative electrode tab, which can effectively improve the performance of the battery monomer 10.

[0243] In some embodiments, the insulating member 25 is a high polymer material film layer. The high polymer material film layer not only has good insulation performance, but also has good strength and ductility.

[0244] In some embodiments, the insulating member 25 includes at least one of polypropylene, polyolefin, ethylene-vinyl acetate copolymer, epoxy resin glue, silicone rubber, polyurethane, and polyethylene terephthalate.

[0245] The embodiments of the present application provide a battery device 100, including the battery monomer 10 provided by any one of the above embodiments.

[0246] The embodiments of the present application provide a power utilization device, including the battery monomer 10 provided by any one of the above embodiments or the battery device 100 provided by any one of the above embodiments, and the battery monomer 10 is used to provide electric energy.

[0247] The embodiments of the present application provide an electrode assembly 2, including a first tab 22, a second tab 23, a solid-state electrolyte layer 24, and an insulating member 25; the first tab 22 includes a first active material region 221 and a first tab 222, the first tab 222 protruding from the first active material region 221; the second tab 23 is opposite in polarity to the first tab 22, the second tab 23 including a main body region 231 and an overhanging region 232 that exceeds the first active material region 221, the main body region 231 being stacked with the first active material region 221 along a first direction Z; at least part of the solid-state electrolyte layer 24 is disposed between the first tab 22 and the second tab 23 along the first direction Z; the insulating member 25 is disposed at an edge region of the first active material region 221, and the insulating member 25 is configured to insulate and isolate the overhanging region 232 and the first active material region 221.

[0248] The specific structure of the electrode assembly 2 in the present embodiment can refer to the specific structure of the electrode assembly 2 described in the foregoing embodiments, which will not be described here again.

[0249] In the embodiment, the edge region of the first active material region 221 is provided with the insulating member 25, which can insulate and separate the overhanging region 232 of the second pole piece 23 from the first active material region 221 of the first pole piece 22, thereby reducing the risk of the overhanging region 232 and the first active material region 221 being overlapped, and further reducing the risk of the first pole piece 22 and the second pole piece 23 being short-circuited.

[0250] Please refer to FIG. 19, which is a flowchart of a method for manufacturing the electrode assembly 2 according to some embodiments of the present application. The embodiments of the present application further provide a method for manufacturing the electrode assembly 2, which includes: step S100: providing the first pole piece 22, the solid-state electrolyte layer 24, and the second pole piece 23; wherein the first pole piece 22 and the second pole piece 23 have opposite polarities, the first pole piece 22 includes the first active material region 221 and the first tab 222, the first tab 222 protrudes from the first active material region 221, and the edge region of the first active material region 221 is provided with the insulating member 25; step S200: stacking the first pole piece 22, the solid-state electrolyte layer 24, and the second pole piece 23 along the first direction Z to form a stacked structure; and step S300: performing a pressing process on the stacked structure, so that the second pole piece 23 forms the overhanging region 232 that exceeds the first active material region 221, and the insulating member 25 insulates and separates the overhanging region 232 and the first active material region 221.

[0251] For example, the first pole piece 22 is a positive pole piece, and the second pole piece 23 is a negative pole piece.

[0252] For example, the positive active material LiNi 0.7 Co 0.1 Mn 0.1 O2, a conductive agent Super P, and a binder polyvinylidene fluoride (PVDF) in N-methyl pyrrolidone (NMP) to form a positive electrode slurry, wherein the solid content in the positive electrode slurry is 50wt%, and the solid content in the positive electrode slurry includes 90wt% of LiNi 0.7 Co 0.1 Mn 0.1The positive electrode slurry is prepared by mixing LiFePO4, Super P, and PVDF in a mass ratio of 8:1:1. The positive electrode slurry is coated on the upper and lower surfaces of the current collector aluminum foil, which is then dried at 85°C, cold-pressed, and then subjected to edge cutting, piece cutting, and strip cutting, and dried at 85°C under vacuum for 4 hours to obtain a positive electrode sheet. The negative electrode slurry is prepared by mixing graphite, a conductive agent Super P, a thickening agent carboxymethyl cellulose (CMC), and an adhesive styrene butadiene rubber (SBR) in deionized water. The solid content in the negative electrode slurry is 30 wt%, and the mass ratio of the solid components, i.e., graphite, silicon monoxide, Super P, CMC, and the adhesive styrene butadiene rubber (SBR), is 88:7:3:2. The negative electrode slurry is coated on the upper and lower surfaces of the current collector copper foil, which is then dried at 85°C, cold-pressed, and then subjected to edge cutting, piece cutting, and strip cutting, and dried at 120°C under vacuum for 12 hours to obtain a negative electrode sheet. The solid electrolyte layer 24 is prepared by a conventional solvent-free dry process using a sulfide solid electrolyte and polytetrafluoroethylene.

[0253] Before step S100, the insulating member 25 can be arranged at the edge region of the first active material region 221 of the first electrode sheet 22, for example, by bonding the insulating member 25 at the two ends along the second direction Y and the two ends along the third direction X of the first active material region 221, so that the insulating member 25 is arranged around the four sides of the first active material region 221, wherein the first direction Z, the second direction Y, and the third direction X are perpendicular to each other.

[0254] In step S200, the first electrode sheet 22, the solid electrolyte layer 24, and the second electrode sheet 23 can be sequentially stacked to form a stacked structure, or the first electrode sheet 22 and the solid electrolyte layer 24 can be combined to form a composite structure, and then the composite structure and the second electrode sheet 23 can be stacked to form a stacked structure, or the second electrode sheet 23 and the solid electrolyte layer 24 can be combined to form a composite structure, and then the composite structure and the first electrode sheet 22 can be stacked to form a stacked structure.

[0255] In step S300, the stacked structure can be subjected to hot flat pressing or isostatic pressing.

[0256] The electrode assembly 2 prepared by the above scheme can insulate and isolate the overhanging region 232 of the second electrode sheet 23 from the first active material region 221 of the first electrode sheet 22 by the insulating member 25, thereby reducing the risk of overlap between the overhanging region 232 and the first active material region 221, and further reducing the risk of short circuit between the first electrode sheet 22 and the second electrode sheet 23.

[0257] In some embodiments, step S200 includes:

[0258] Step S210: combining the second electrode sheet 23 and the solid electrolyte layer 24 to form a composite electrode sheet;

[0259] Step S220: alternately stack the first pole piece 22 and the composite pole piece along the first direction Z to form a stacked structure.

[0260] In step S210, the second pole piece 23 and the solid-state electrolyte layer 24 can be compounded in various ways, such as, after the second pole piece 23 and the solid-state electrolyte layer 24 are formed, the two are hot flat-compressed to be compounded; or, after the second pole piece 23 is formed, solid-state electrolyte slurry is coated on the surface of the second pole piece 23, and after the solid-state electrolyte slurry is solidified, the solid-state electrolyte layer 24 is formed to achieve the compounding of the second pole piece 23 and the solid-state electrolyte layer 24.

[0261] In this embodiment, the second pole piece 23 is first compounded with the solid-state electrolyte layer 24 to form a composite pole piece, and then the first pole piece 22 and the composite pole piece are alternately stacked along the first direction Z, which can reduce the difficulty of stacking the first pole piece 22, the solid-state electrolyte layer 24, and the second pole piece 23.

[0262] In some embodiments, step S300 includes: performing isostatic pressing treatment on the stacked structure.

[0263] In step S300, the stacked structure can be put into a sealed bag, and then the sealed bag is put into a closed container, and the liquid or gas in the closed container is used to perform isostatic pressing treatment on the stacked structure. The sealed bag can protect the stacked structure, reducing the influence of environmental factors on the stacked structure during isostatic pressing treatment.

[0264] In this embodiment, the isostatic pressing method is used to apply pressure to the stacked structure, so that the stress on the stacked structure is more uniform, and the adhesion of the first pole piece 22 and the second pole piece 23 to the solid-state electrolyte layer 24 is better, which is conducive to the structural stability and performance of the electrode assembly 2 during the cycle.

[0265] In some embodiments, the pressure of the isostatic pressing treatment is 100-1000 Mpa.

[0266] In this embodiment, the pressure of the isostatic pressing treatment can be 100 Mpa, 200 Mpa, 300 Mpa, 400 Mpa, 500 Mpa, 600 Mpa, 700 Mpa, 800 Mpa, 900 Mpa, 1000 Mpa, etc. Any one of the above values or a range value between any two of the above values can be selected.

[0267] The pressure of the isostatic pressing treatment is 100-1000 Mpa, so that the first pole piece 22 and the second pole piece 23 can be tightly adhered to the solid-state electrolyte layer 24, reducing the interface impedance between the pole piece and the solid-state electrolyte layer 24, and making the structure of the electrode assembly 2 more compact, which is conducive to improving the volume energy density of the battery monomer 10, and can reduce the risk of the first pole piece 22, the second pole piece 23, and the solid-state electrolyte layer 24 being damaged.

[0268] In some embodiments, the pressure of the isostatic pressing process is 300-800 MPa.

[0269] In this embodiment, the pressure of the isostatic pressing process can take any one of 350 MPa, 400 MPa, 450 MPa, 500 MPa, 550 MPa, 600 MPa, 650 MPa, 700 MPa, 750 MPa, 800 MPa, etc. or a range value between any two of them.

[0270] In some embodiments, the temperature of the isostatic pressing process is 0-300℃.

[0271] In this embodiment, the temperature of the isostatic pressing process can take any one of 0℃, 20℃, 50℃, 80℃, 100℃, 120℃, 150℃, 200℃, 250℃, 280℃, 300℃, etc. or a range value between any two of them.

[0272] Controlling the temperature of the isostatic pressing process in the range of 0-300℃ can more easily adhere both the first pole piece 22 and the second pole piece 23 to the solid-state electrolyte layer 24.

[0273] In some embodiments, the temperature of the isostatic pressing process is 80-150℃.

[0274] In this embodiment, the temperature of the isostatic pressing process can take any one of 80℃, 90℃, 100℃, 110℃, 120℃, 130℃, 140℃, 150℃, etc. or a range value between any two of them.

[0275] In some embodiments, the duration of the isostatic pressing process is 1-100 min.

[0276] In this embodiment, the duration of the isostatic pressing process can take any one of 1 min, 10 min, 15 min, 20 min, 25 min, 30 min, 35 min, 40 min, 45 min, 50 min, 55 min, 60 min, 65 min, 70 min, 75 min, 80 min, 85 min, 90 min, 95 min, 100 min, etc. or a range value between any two of them.

[0277] In this embodiment, the duration of the isostatic pressing process is 1-100 min, which can improve the tightness of the adhesion of both the first pole piece 22 and the second pole piece 23 to the solid-state electrolyte layer 24.

[0278] In some embodiments, the duration of the isostatic pressing process is 10-80 min.

[0279] In the present embodiment, the duration of the isostatic pressing process can be any one of 10 min, 12 min, 15 min, 18 min, 20 min, 22 min, 25 min, 28 min, 30 min, 32 min, 35 min, 40 min, 42 min, 45 min, 48 min, 50 min, 52 min, 55 min, 58 min, 60 min, 62 min, 65 min, 68 min, 70 min, 72 min, 75 min, 78 min, 80 min, or a range value between any two of them.

[0280] In addition, referring to FIGS. 4-6, the present embodiment provides a battery monomer 10, which includes a shell 1 and an electrode assembly 2 accommodated in the shell 1, and the electrode assembly 2 is a laminated structure. The electrode assembly 2 includes a first electrode sheet 22, a second electrode sheet 23, a solid-state electrolyte layer 24, and an insulating piece 25. The first electrode sheet 22 is a positive electrode sheet, and the second electrode sheet 23 is a negative electrode sheet. At least part of the solid-state electrolyte layer 24 is arranged between the first electrode sheet 22 and the second electrode sheet 23 along a first direction Z, and the first electrode sheet 22 is provided with the second electrode sheet 23 on both sides. The first electrode sheet 22 includes a first active material area 221 and a first tab 222 protruding from one end of the first active material area 221 along a second direction Y. The second electrode sheet 23 includes a main body area 231 and an overhanging area 232 beyond the first active material area 221, and the main body area 231 is arranged in a laminated manner with the first active material area 221 along the first direction Z. Along the second direction Y, both ends of the main body area 231 are provided with the overhanging area 232, and the end of the first active material area 221 close to the overhanging area 232 is provided with the insulating piece 25 along the second direction Y. Along a third direction X, both ends of the main body area 231 are also provided with the overhanging area 232, and the end of the first active material area 221 close to the overhanging area 232 is provided with the insulating piece 25 along the third direction X. The insulating piece 25 is configured to insulate and isolate the overhanging area 232 and the first active material area 221. The first direction Z, the second direction Y, and the third direction X are perpendicular to each other.

[0281] Please refer to FIGS. 9-11, two insulating pieces 25 are arranged at both ends of the first active material area 221 along the second direction Y, and the insulating piece 25 includes a first insulating portion 251, a second insulating portion 252 and a third insulating portion 253 connected in sequence. Along the first direction Z, at least part of the first insulating portion 251 is arranged between the first active material area 221 and the main body area 231, and at least part of the third insulating portion 253 is arranged between the overhanging areas 232 of the two adjacent second pole pieces 23. Along the second direction Y, at least part of the second insulating portion 252 is arranged between the first active material area 221 and the overhanging area 232. The third insulating portions 253 of the two insulating pieces 25 arranged at the same end of the first active material area 221 along the second direction Y are connected to each other, and a part of the third insulating portions 253 of the two insulating pieces 25 arranged at the end of the first active material area 221 along the second direction Y close to the first tab 222 are located on both sides of the first tab 222 respectively. The size of the first insulating portion 251 along the second direction Y is L1, and 0.1mm≤L1≤10mm. Along the second direction Y, the third insulating portion 253 exceeds one end of the overhanging area 232 away from the main body area 231.

[0282] Please refer to FIGS. 15 and 16, two insulating pieces 25 are arranged at both ends of the first active material area 221 along the third direction X, and the insulating piece 25 includes a fourth insulating portion 254, a fifth insulating portion 255 and a sixth insulating portion 256 connected in sequence. Along the first direction Z, at least part of the fourth insulating portion 254 is arranged between the first active material area 221 and the main body area 231, and at least part of the sixth insulating portion 256 is arranged between the overhanging areas 232 of the two adjacent second pole pieces 23. Along the third direction X, at least part of the fifth insulating portion 255 is arranged between the first active material area 221 and the overhanging area 232. The sixth insulating portions 256 of the two insulating pieces 25 arranged at the same end of the first active material area 221 along the third direction X are connected to each other. The size of the fourth insulating portion 254 along the third direction X is L2, and 0.1mm≤L2≤10mm. Along the third direction X, the sixth insulating portion 256 exceeds one end of the overhanging area 232 away from the main body area 231.

[0283] In such a battery cell 10, the two ends along the second direction Y and the two ends along the third direction X of the first active material area 221 are provided with insulating pieces 25, which can insulate and separate the overhanging area 232 around the second pole piece 23 from the first active material area 221 of the first pole piece 22, reducing the risk of overlap between the overhanging area 232 and the first active material area 221, thereby reducing the risk of short circuit between the first pole piece 22 and the second pole piece 23, and improving the reliability of the battery cell 10.

[0284] Referring to FIGS. 12-14, the embodiment of the present application provides a battery cell 10, comprising a shell 1 and an electrode assembly 2, the electrode assembly 2 is contained in the shell 1, and the electrode assembly 2 is a laminated structure. The electrode assembly 2 comprises a first electrode sheet 22, a second electrode sheet 23, a solid-state electrolyte layer 24, and an insulating piece 25. The first electrode sheet 22 is a positive electrode sheet, the second electrode sheet 23 is a negative electrode sheet, at least part of the solid-state electrolyte layer 24 is arranged between the first electrode sheet 22 and the second electrode sheet 23 along a first direction Z, and the first electrode sheet 22 is provided with the second electrode sheet 23 on both sides. The first electrode sheet 22 comprises a first active material area 221 and a first tab 222, the first tab 222 protrudes from one end of the first active material area 221 along a second direction Y. The second electrode sheet 23 comprises a main body area 231 and an overhanging area 232 beyond the first active material area 221, and the main body area 231 is arranged in a laminated manner with the first active material area 221 along the first direction Z. Along the second direction Y, both ends of the main body area 231 are provided with the overhanging area 232, and the end of the first active material area 221 close to the overhanging area 232 along the second direction Y is provided with the insulating piece 25, and along a third direction X, both ends of the main body area 231 are also provided with the overhanging area 232, and the end of the first active material area 221 close to the overhanging area 232 along the third direction X is provided with the insulating piece 25, and the insulating piece 25 is configured to insulate and separate the overhanging area 232 and the first active material area 221. The first direction Z, the second direction Y and the third direction X are perpendicular to each other.

[0285] The end of the first active material area 221 close to the first tab 222 along the second direction Y is provided with two insulating pieces 25. The insulating piece 25 arranged at the end of the first active material area 221 close to the first tab 222 along the second direction Y comprises a first insulating part 251, a second insulating part 252 and a third insulating part 253 connected in sequence. Along the first direction Z, at least part of the first insulating part 251 is arranged between the first active material area 221 and the main body area 231, and at least part of the third insulating part 253 is arranged between the overhanging areas 232 of two adjacent second electrode sheets 23. Along the second direction Y, at least part of the second insulating part 252 is arranged between the first active material area 221 and the overhanging area 232. The third insulating parts 253 of the two insulating pieces 25 arranged at the end of the first active material area 221 close to the first tab 222 along the second direction Y are connected to each other, and part of the third insulating parts 253 of the two insulating pieces 25 are respectively located on both sides of the first tab 222. The size of the first insulating part 251 of the insulating piece 25 arranged at the end of the first active material area 221 close to the first tab 222 along the second direction Y along the second direction Y is L1, and 0.1mm≤L1≤10mm. Along the second direction Y, the third insulating part 253 of the insulating piece 25 arranged at the end of the first active material area 221 close to the first tab 222 along the second direction Y exceeds one end of the overhanging area 232 away from the main body area 231.

[0286] Please refer to FIG. 13, the first active material area 221 is provided with an insulating member 25 at each end away from the first tab 222 along the second direction Y, the insulating member 25 includes a second insulating part 252 and two first insulating parts 251, and the second insulating part 252 connects the two first insulating parts 251. In the insulating member 25 provided at each end of the first active material area 221 away from the first tab 222 along the second direction Y, the size of the first insulating part 251 along the second direction Y is L1, 0.1mm≤L1≤10mm, and along the first direction Z, at least part of one first insulating part 251 is arranged between the first active material area 221 and the main body area 231 of one second tab 23, and at least part of the other first insulating part 251 is arranged between the first active material area 221 and the main body area 231 of the other second tab 23, and along the second direction Y, at least part of the second insulating part 252 is arranged between the first active material area 221 and the overhanging area 232.

[0287] Please refer to FIG. 17 and FIG. 18, the first active material area 221 is provided with an insulating member 25 at each end along the third direction X, the insulating member 25 includes a fifth insulating part 255 and two fourth insulating parts 254, and the fifth insulating part 255 connects the two fourth insulating parts 254. In the insulating member 25 provided at each end of the first active material area 221 along the third direction X, the size of the fourth insulating part 254 along the third direction X is L2, 0.1mm≤L2≤10mm, and along the first direction Z, at least part of one fourth insulating part 254 is arranged between the first active material area 221 and the main body area 231 of one second tab 23, and at least part of the other fourth insulating part 254 is arranged between the first active material area 221 and the main body area 231 of the other second tab 23, and along the third direction X, at least part of the fifth insulating part 255 is arranged between the first active material area 221 and the overhanging area 232.

[0288] In such a battery monomer 10, the two ends along the second direction Y and the two ends along the third direction X of the first active material area 221 are provided with insulating members 25, and the insulating members 25 can insulate and separate the overhanging area 232 around the second tab 23 from the first active material area 221 of the first tab 22, reducing the risk of the overhanging area 232 and the first active material area 221 being overlapped, thereby reducing the risk of short circuit between the first tab 22 and the second tab 23, and improving the reliability of the battery monomer 10.

[0289] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0290] The above examples are only used to illustrate the technical solutions of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, comprising: a housing; an electrode assembly accommodated in the housing, the electrode assembly comprising: a first tab comprising a first active material region and a first tab lug protruding from the first active material region; a second tab opposite in polarity to the first tab, the second tab comprising a main body region and an overhang region beyond the first active material region, the main body region being stacked with the first active material region along a first direction; a solid-state electrolyte layer, at least part of the solid-state electrolyte layer being disposed between the first tab and the second tab along the first direction; and an insulating member disposed at an edge region of the first active material region, the insulating member being configured to insulate the overhang region from the first active material region. Along the first direction, the first active material region has a first surface facing the main body region, at least part of the overhang region being located on a side of the first surface away from the main body region, and at least part of the insulating member being located between the overhang region and the first active material region. The solid-state electrolyte layer comprises a first portion and a second portion, the first portion being misaligned with the second portion along the first direction, the first portion being disposed between the main body region and the first active material region, and the second portion being stacked with the overhang region. Along the first direction, the first active material region has a first surface facing the main body region, at least part of the second portion being located on a side of the first surface away from the main body region, and at least part of the insulating member being located between the second portion and the first active material region. Along the first direction, at least part of the insulating member is located between the first active material region and the main body region. Along the first direction, the part of the insulating member located between the first active material region and the main body region is connected to a side of the first active material region facing the main body region. The main body region is provided with the overhang region at at least one end along a second direction, the first active material region is provided with the insulating member at an end close to the overhang region along the second direction, and the second direction is perpendicular to the first direction.

2. The battery cell of claim 1, wherein, Along the first direction, the first tab is provided with the second tab on both sides of the first tab.

3. The battery cell of claim 1 or 2, wherein, The first active material region is provided with two insulating members at an end close to the overhang region along the second direction, and the insulating member provided at at least one end of the first active material region along the second direction comprises a first insulating portion, a second insulating portion and a third insulating portion connected in sequence. Along the first direction, at least part of the first insulating portion is disposed between the first active material region and the main body region, and at least part of the third insulating portion is disposed between the overhang regions of two adjacent second tabs; along the second direction, at least part of the second insulating portion is disposed between the first active material region and the overhang region.

4. The battery cell of any one of claims 1-3, wherein, Along the first direction, the first insulating portions of the two insulating members are respectively connected to opposite sides of the first active material region.

5. The battery cell of claim 4, wherein, ​ 6. The battery cell of any one of claims 1-5, wherein, ​ 7. The battery cell of claim 6, wherein, ​ ​ ​ 8. The battery cell of claim 7, wherein, ​ 9. The battery cell of claim 7 or 8, wherein, The third insulation part of the two insulation members arranged at at least one end of the first active material region along the second direction is connected to each other.

10. The battery cell of any one of claims 7-9, wherein, At least one end of the first active material region along the second direction is provided with the first tab. In the insulation member arranged at an end of the first active material region along the second direction close to the first tab, at least part of the third insulation part is located between the first tab and the overhanging region along the first direction.

11. The battery cell of any one of claims 7-10, wherein, The third insulation part overhangs one end of the overhanging region away from the main body region along the second direction.

12. The battery cell of claim 6, wherein, Both sides of the first tab are provided with the second tab along the first direction. The insulation member arranged at at least one end of the first active material region along the second direction comprises a second insulation part and two first insulation parts, and the second insulation part connects the two first insulation parts. At least part of one first insulation part is arranged between the first active material region and the main body region of one second tab along the first direction, and at least part of the other first insulation part is arranged between the first active material region and the main body region of the other second tab along the first direction; at least part of the second insulation part is arranged between the first active material region and the overhanging region along the second direction.

13. The battery cell of claim 12, wherein, The two first insulation parts are connected to the opposite sides of the first active material region along the first direction, respectively.

14. The battery cell of any one of claims 7-13, wherein, The size of the first insulation part along the second direction is L1, and 0.1mm≤L1≤10mm; optionally, 2mm≤L1≤8mm.

15. The battery cell of any one of claims 6-14, wherein, Both ends of the main body region along the second direction are provided with the overhanging region, and both ends of the first active material region along the second direction are provided with the insulation member.

16. The battery cell of any one of claims 6-15, wherein, At least one end of the main body region along the third direction is provided with the overhanging region, and the end of the first active material region along the third direction close to the overhanging region is provided with the insulation member, and the first direction and the second direction are perpendicular to the third direction.

17. The battery cell of claim 16, wherein, Both sides of the first tab are provided with the second tab along the first direction. The end of the first active material region along the third direction close to the overhanging region is provided with two insulation members, and the insulation member arranged at at least one end of the first active material region along the third direction comprises a fourth insulation part, a fifth insulation part and a sixth insulation part connected in sequence. At least part of the fourth insulation part is arranged between the first active material region and the main body region along the first direction, and at least part of the sixth insulation part is arranged between the overhanging regions of two adjacent second tabs along the third direction.

18. The battery cell of claim 17, wherein, The first active material region has two opposite first surfaces along the first direction, and the fourth insulation parts of the two insulation members are connected to the opposite sides of the first active material region, respectively.

19. The battery cell of claim 17 or 18, wherein, The sixth insulation part of the two insulation members arranged at at least one end of the first active material region along the third direction is connected to each other.

20. The battery cell of any one of claims 17-19, wherein, Along the third direction, the sixth insulation part exceeds the overhanging region from one end of the main body region.

21. The battery cell of claim 16, wherein, Along the first direction, the first tab is provided with the second tab on both sides; The insulation member arranged at at least one end of the first active material region along the third direction comprises a fifth insulation part and two fourth insulation parts, and the fifth insulation part is connected to the two fourth insulation parts; Along the first direction, at least part of one fourth insulation part is arranged between the first active material region and the main body region of one second tab, and at least part of the other fourth insulation part is arranged between the first active material region and the main body region of the other second tab; along the third direction, at least part of the fifth insulation part is arranged between the first active material region and the overhanging region.

22. The battery cell of claim 21, wherein, Along the first direction, the two fourth insulation parts are respectively connected to the opposite sides of the first active material region.

23. The battery cell of any one of claims 17-22, wherein, The fourth insulation part has a size L2 along the third direction, and 0.1mm≤L2≤10mm; optionally, 2mm≤L2≤8mm.

24. The battery cell of any one of claims 16-23, wherein, The main body region is provided with an overhanging region at each opposite end along the third direction, and the first active material region is provided with the insulation member at each opposite end along the third direction.

25. The battery cell of any one of claims 1-24, wherein, The first tab is a positive tab, and the second tab is a negative tab.

26. The battery cell of any one of claims 1-25, wherein, The insulation member is a film layer of a high polymer material.

27. The battery cell of any one of claims 1-26, wherein, The insulation member comprises at least one of polypropylene, polyolefin, ethylene-vinyl acetate copolymer, epoxy resin glue, silicone rubber, polyurethane and polyethylene terephthalate.

28. A battery device comprising the battery cell of any one of claims 1-27.

29. An electric device comprising the battery cell of any one of claims 1-27 or the battery device of claim 28, the battery cell being configured to provide electric energy.

30. An electrode assembly comprising: a first tab comprising a first active material region and a first tab lug protruding from the first active material region; a second tab opposite in polarity to the first tab, the second tab comprising a main body region and an overhanging region overhanging the first active material region, the main body region being stacked with the first active material region along a first direction; a solid-state electrolyte layer, at least part of the solid-state electrolyte layer being arranged between the first tab and the second tab along the first direction; an insulation member arranged at an edge region of the first active material region, the insulation member being configured to insulate and isolate the overhanging region and the first active material region.

31. A method for manufacturing an electrode assembly, the method comprising: S100: providing a first tab, a solid-state electrolyte layer and a second tab; wherein the first tab and the second tab are opposite in polarity, the first tab comprising a first active material region and a first tab lug protruding from the first active material region, and an insulation member is arranged at an edge region of the first active material region. Step S200: stacking the first electrode sheet, the solid-state electrolyte layer, and the second electrode sheet in a first direction to form a stacked structure; Step S300: performing a pressure treatment on the stacked structure, so that the second electrode sheet forms an overhanging region beyond the first active material region, and the insulating member insulatingly separates the overhanging region and the first active material region.

32. The method of claim 31, wherein, The step S200 comprises: Step S210: compounding the second electrode sheet and the solid-state electrolyte layer to form a compound electrode sheet; Step S220: alternately stacking the first electrode sheet and the compound electrode sheet in the first direction to form the stacked structure.

33. The method of claim 31 or 32, wherein, The step S300 comprises: Performing an isostatic pressing treatment on the stacked structure.

34. The method of claim 33, wherein, The pressure of the isostatic pressing treatment is 100-1000 Mpa, and is optionally 300-800 Mpa.

35. The method of claim 33 or 34, wherein, The temperature of the isostatic pressing treatment is 0-300℃, and is optionally 80-150℃.

36. The method of any one of claims 33-35, wherein, The duration of the isostatic pressing treatment is 1-100 min, and is optionally 10-80 min.

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