Battery monomer, battery device and electric device

Abstract

The invention provides a battery monomer, a battery device and a power utilization device. The battery cell comprises a shell and an electrode assembly, and the electrode assembly is accommodated in the shell. The electrode assembly comprises a first pole piece, a second pole piece, a solid electrolyte layer and an insulating part. The first pole piece comprises a first main body area and a first pole lug, the first pole lug is arranged at one end of the first main body area along the first direction, the first pole lug comprises a folding part and a connecting part which are connected in sequence, the folding part is used for being connected with the folding part of the adjacent first pole lug, and the connecting part is connected with the folding part and the first main body area. The polarity of the second pole piece is opposite to that of the first pole piece, and the end, close to the first tab, of the second pole piece is a first end in the first direction. The solid electrolyte layer is arranged between the first pole piece and the second pole piece along a second direction, and the second direction is intersected with the first direction. The arrangement of the insulating part reduces the risk of short circuit of the first pole piece and the second pole piece caused by lap joint of the connecting part and the first end, and the reliability of the battery monomer is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power utilization device. 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 monomers. Therefore, how to improve the reliability of battery monomers is a problem to be solved in battery technology. SUMMARY

[0003] The embodiments of the present application provide a battery monomer, a battery device and a power utilization device, which can improve the reliability of the battery monomer.

[0004] In a first aspect, the embodiments of the present application provide a battery monomer, comprising a shell and an electrode assembly, the electrode assembly being accommodated in the shell; the electrode assembly comprises a first pole piece, a second pole piece, a solid-state electrolyte layer and an insulating piece; the first pole piece comprises a first main body region and a first tab, the first tab being arranged at one end of the first main body region along a first direction, the first tab comprising a folding part and a connecting part connected in sequence, the folding part being used to connect with the folding part of an adjacent first tab, and the connecting part connecting the folding part and the first main body region; the second pole piece is opposite in polarity to the first pole piece, and along the first direction, one end of the second pole piece close to the first tab is a first end; the solid-state electrolyte layer is arranged between the first pole piece and the second pole piece along a second direction, the second direction intersecting the first direction; and the insulating piece is arranged at least partially between the connecting part and the first end along the first direction, so as to insulate and separate the connecting part and the second pole piece.

[0005] In the above technical solution, the insulating piece is arranged at least partially between the connecting part and the first end along the first direction, so that the connecting part of the first tab and the second pole piece can be insulated and separated by the insulating piece, thereby reducing the risk of short circuit of the first pole piece and the second pole piece caused by the lap joint of the connecting part and the first end, and effectively improving the reliability of the battery monomer.

[0006] In some embodiments, the insulating member includes a first insulating member disposed on the connecting portion, with at least a portion of the first insulating member located between the connecting portion and the first end along a first direction. By disposing the first insulating member on the connecting portion and having at least a portion of the first insulating member located between the connecting portion and the first end, the risk of the surface of the connecting portion facing the first end coming into contact with the first end can be reduced, and stable insulation between the connecting portion and the second electrode can be achieved. Furthermore, after the first electrode is formed, the first insulating member can be disposed on the first tab first, and then the electrode assembly can be formed by the first electrode, the second electrode, and the solid electrolyte layer, which can reduce the difficulty of arranging the first insulating member.

[0007] In some embodiments, the connecting portion is bent to form a first connecting portion and a second connecting portion connected to each other. The first connecting portion is connected to a retracting portion, and the second connecting portion is connected to a first main body region. Along a first direction, the first connecting portion and a first end are disposed opposite each other. The first connecting portion has a first surface facing the first end. At least a portion of the first insulating member is located between the first connecting portion and the first end, and covers at least a portion of the first surface. Because the connecting portion has a bent structure, after bending, the first connecting portion and the first end are in a state of opposition along the first direction, and the first surface of the first connecting portion facing the first end contacts the first end, which increases the risk of a short circuit between the first electrode and the second electrode. However, by disposing at least a portion of the first insulating member between the first connecting portion and the first end, and covering at least a portion of the first surface, the risk of the first surface of the first connecting portion contacting the first end can be effectively reduced, thereby reducing the risk of a short circuit between the first electrode and the second electrode.

[0008] In some embodiments, along the second direction, the second connection portion has a second surface facing the second electrode, the second surface being connected to the first surface, and the first insulating member covering at least a portion of the second surface. This allows the first insulating member to function as both a separator between the first connection portion and the second electrode, reducing the risk of a short circuit between the first and second electrodes due to contact between the second surface of the second connection portion and the second electrode.

[0009] In some embodiments, along a first direction, a first body region has a second end, a first tab is connected to the second end, and a solid electrolyte layer includes a first overhang region extending beyond the second end; along a second direction, a portion of a first insulating member is located between the first overhang region and the connection portion. This makes the first insulating member longer in the extension direction of the first tab, increasing the coverage area of ​​the first insulating member over the surface of the connection portion, allowing the first insulating member to better separate the connection portion and the second electrode, and reducing the risk of overlap between the connection portion and the second electrode.

[0010] In some embodiments, along the second direction, the portion of the first insulating member located between the first extended region and the connecting portion abuts against the first extended region and the connecting portion. The portion of the first insulating member located between the first extended region and the connecting portion can support the first extended region and the connecting portion, so that the first extended region and the connecting portion maintain a certain distance in the second direction, reducing the risk that the solid electrolyte layer will be cracked or sheared by the edge of the first main body region at the second end during the electrode assembly molding process.

[0011] In some embodiments, along a first direction, a first body region has a second end, to which a first electrode tab is connected; a first insulating member includes a first insulating portion connected to the second end and extending along the extension direction of the first electrode tab, wherein at least a portion of the first insulating portion is located between the connecting portion and the first end along the first direction. This results in a longer dimension of the first insulating portion along the extension direction of the first electrode tab, increasing the coverage area of ​​the first insulating portion over the surface of the connecting portion and reducing the risk of overlap between the connecting portion and the second electrode plate.

[0012] In some embodiments, along the second direction, the first electrode and the second electrode are alternately arranged, with one more second electrode than the first electrode. Along the extension direction of the first tab, the length of the first insulating portion is H, where Q ≤ H ≤ 2Q; N is an even number, Q = M1 × N / 2 + M2 × (N-1) / 2 + M3 × (N-1); or N is an odd number, Q = M1 × (N-1) / 2 + M2 × (N-1) / 2 + M3 × (N-1); wherein the number of first electrodes in the electrode assembly is N; the thickness of the first electrode is M1, the thickness of the second electrode is M2, and the thickness of the solid electrolyte layer is M3. The length of the first insulating portion is designed based on the number of first electrodes and the thicknesses of the first electrode, the second electrode, and the solid electrolyte layer, so that the first insulating portion has sufficient length to extend between the connecting portion and the first end, effectively separating the connecting portion and the second electrode in the first direction.

[0013] In some embodiments, the solid electrolyte layer includes a first extended region extending beyond the second end; along the second direction, a portion of the first insulating portion is located between the first extended region and the connecting portion, and abuts against the first extended region and the connecting portion. The first insulating portion is connected to the second end, and a portion is located between the first extended region and the connecting portion, so that the first insulating portion can provide stable support for the first extended region and the connecting portion, so that the first extended region and the connecting portion are kept at a certain distance in the second direction, reducing the risk that the solid electrolyte layer will be cracked or sheared by the edge of the first body region located at the second end during the electrode assembly molding process.

[0014] In some embodiments, the first insulating portion includes a first part and a second part; the first part is disposed on the connecting portion, and at least a portion of the first part is located between the connecting portion and the first end along a first direction; the second part is connected to the first part and connected to the second end, the thickness of the second part is greater than the thickness of the first part, and at least a portion of the second part is located between the first protruding area and the connecting portion along a second direction, and abuts against the first protruding area and the connecting portion. The thicker second part, disposed between the first protruding area and the connecting portion, provides good support for the first protruding area and the connecting portion in the second direction. The thinner first part, disposed on the connecting portion, has better bending performance to accommodate bending of the connecting portion. This structure of the first insulating portion provides good support for the first protruding area and the connecting portion, can bend along with the connecting portion, and reduces the material usage of the first insulating portion, resulting in better economy.

[0015] In some embodiments, along the first direction, the dimension of the second portion is d, and the dimension of the first extended region is D, where 0.1 ≤ d / D ≤ 1. d / D ≥ 0.1 ensures that the ratio of the dimension of the second portion along the first direction to the dimension of the first extended region along the first direction is not too small, allowing the second portion to provide sufficient support for the first extended region and the connecting portion, reducing the risk of the solid electrolyte layer being cracked or sheared during electrode assembly molding. d / D ≤ 1 ensures that the ratio of the dimension of the second portion along the first direction to the dimension of the first extended region along the first direction is not too large, reducing the material used in the second portion and achieving better economy. Therefore, 0.1 ≤ d / D ≤ 1 balances the support performance and economy of the second portion.

[0016] In some embodiments, 2mm ≤ d ≤ 10mm. d ≥ 2mm results in a larger dimension of the second part along the first direction, reducing the molding difficulty of the second part and ensuring sufficient support for the first protruding area and the connecting portion. d ≤ 10mm prevents the dimension of the second part along the first direction from becoming excessively large, reducing material waste.

[0017] In some embodiments, the first insulating member further includes a second insulating portion connected to the second portion. The thickness of the second insulating portion is less than the thickness of the second portion, and the second insulating portion is stacked with the first main body region along the second direction. The stacking of the second insulating portion and the first main body region along the second direction increases the overall length of the first insulating member, further reducing the risk of overlap between the connecting portion and the second electrode. It also increases the contact area between the first insulating member and the first electrode, making the first insulating member more stable on the first electrode, thus achieving stable insulation between the connecting portion and the second electrode. Furthermore, because the thickness of the second insulating portion is less than the thickness of the second portion, the thickness of the second insulating portion is not excessive, reducing the space occupied by the second insulating portion in the second direction.

[0018] In some embodiments, the first insulating member further includes a second insulating portion connected to the first insulating portion, and the second insulating portion is stacked with the first main body region along a second direction. The stacking of the second insulating portion and the first main body region along the second direction increases the overall length of the first insulating member, further reducing the risk of overlap between the connecting portion and the second electrode; it also increases the contact area between the first insulating member and the first electrode, making the first insulating member more firmly attached to the first electrode, thereby achieving stable insulation between the connecting portion and the second electrode.

[0019] In some embodiments, the first main body region includes a first current collector layer and a first active material layer; the first current collector layer is connected to a first electrode tab; the end of the first active material layer near the first electrode tab along a first direction is located at a second end; along a second direction, the first active material layer is disposed on the side of the first current collector layer facing the solid electrolyte layer, and a second insulating portion is stacked with the first active material layer. This allows the first insulating member to provide a certain degree of protection to the edge region of the first active material layer near the second end, reducing the risk of the edge region of the first active material layer detaching from the first current collector layer, and also reducing the risk of the edge region of the first active material layer contacting the second electrode.

[0020] In some embodiments, the first active material layer includes a main body portion and a thinned portion; the thinned portion is disposed at one end of the main body portion along a first direction near the first electrode tab, and the thickness of the thinned portion is less than the thickness of the main body portion; along a second direction, a second insulating portion is stacked with the thinned portion. This fully utilizes the gap between the thinned portion and the solid electrolyte layer, facilitating a tight fit between the main body portion of the first active material layer and the solid electrolyte layer, and reducing the interfacial impedance between the first electrode and the solid electrolyte layer.

[0021] In some embodiments, the first main body region includes a first current collector layer, a first active material layer, and an insulating layer; the first current collector layer is connected to a first electrode tab; the insulating layer is disposed at one end of the first active material layer near the first electrode tab along a first direction, and the end of the insulating layer near the first electrode tab along the first direction is located at a second end; along a second direction, the first current collector layer has the first active material layer and the insulating layer disposed on the side facing the solid electrolyte layer, and a second insulating portion is stacked with the insulating layer. The insulating layer reduces the risk of burrs in the edge region of the first current collector layer piercing the solid electrolyte layer and contacting the second electrode. The second insulating portion is stacked with the insulating layer, and the second insulating portion, together with the insulating layer, separates the first current collector layer and the second electrode, further reducing the risk of burrs in the edge region of the first current collector layer piercing the solid electrolyte layer and contacting the second electrode.

[0022] In some embodiments, along the first direction, the dimension of the second insulating portion is 'a', and the dimension of the first main body region is 'A', where 0.01 ≤ a / A ≤ 0.05. a / A ≥ 0.01 ensures that the ratio of the dimension of the second insulating portion along the first direction to the dimension of the first main body region along the first direction is not too small, thus ensuring that the second insulating portion, sandwiched between the first main body region and the solid electrolyte layer, has sufficient length, making the first insulating member more secure on the first electrode. a / A ≤ 0.05 ensures that the ratio of the dimension of the second insulating portion along the first direction to the dimension of the first main body region along the first direction is not too large. This reduces the material usage of the second insulating portion, resulting in better economy, and also reduces the risk of the active material layer in the first main body region being largely obscured by the second insulating portion.

[0023] In some embodiments, 0.05mm ≤ a ≤ 5mm. a ≥ 0.05mm ensures the second insulating portion has sufficient length to facilitate its arrangement on the surface of the first body region. a ≤ 5mm prevents the second insulating portion from becoming excessively long, reducing material usage and improving economy.

[0024] In some embodiments, along the second direction, the dimension of the second insulating portion is b, and the dimension of the first main body region is B, where 0.05 ≤ b / B ≤ 0.25. b / B ≥ 0.05 ensures that the ratio of the dimension of the second insulating portion along the second direction to the dimension of the first main body region along the second direction is not too small, thus ensuring sufficient strength for the second insulating portion. b / B ≤ 0.25 ensures that the ratio of the dimension of the second insulating portion along the second direction to the dimension of the first main body region along the second direction is not too large, reducing the thickness proportion of the second insulating portion in the first main body region and freeing up more space for the active material layer in the first main body region, which is beneficial for improving the volumetric energy density of the battery cell.

[0025] In some embodiments, 0.01mm ≤ b ≤ 0.1mm. b ≥ 0.01mm ensures the second insulating portion has sufficient thickness, improving its strength. b ≤ 0.1mm prevents the second insulating portion from becoming excessively thick, reducing material usage and improving economic efficiency.

[0026] In some embodiments, the electrode assembly includes a plurality of first electrodes arranged along a second direction, with a second electrode disposed between two adjacent first electrodes; the convergence portions of the plurality of first electrodes are connected to form a convergence area, and the plurality of first electrodes include two adjacent third electrodes; a second electrode located between the two third electrodes is disposed opposite to the convergence area along a first direction, and the projection of a first insulating member disposed on the two third electrodes along the first direction together covers the first end of the second electrode located between the two third electrodes. This reduces the risk of overlap between the connection portion of the two third electrodes and the first end of the second electrode located between the two third electrodes.

[0027] In some embodiments, the plurality of first electrodes further includes a fourth electrode, which is arranged along a second direction with the third electrodes. The projection of a first insulating member disposed on the fourth electrode along a first direction covers the first end of a second electrode adjacent to the fourth electrode and located on the side of the fourth electrode near the convergence area. Because the fourth electrode and the third electrode are arranged along the second direction, at least a portion of the connecting portion of the first electrode tab of the fourth electrode will extend obliquely towards the direction of the third electrode, making it easier for the connecting portion of the first electrode tab of the fourth electrode to overlap with the first end of the adjacent second electrode located on the side of the fourth electrode near the convergence area. Furthermore, because the projection of the first insulating member disposed on the fourth electrode along the first direction covers the first end of the second electrode adjacent to the fourth electrode and located on the side of the fourth electrode near the convergence area, the risk of the connecting portion of the first electrode tab of the fourth electrode overlapping with the first end of the adjacent second electrode located on the side of the fourth electrode near the convergence area is effectively reduced.

[0028] In some embodiments, along the second direction, two solid electrolyte layers are respectively disposed on the two opposite surfaces of the second electrode; in a projection plane perpendicular to the first direction, the orthographic projection of the two solid electrolyte layers overlaps with the orthographic projection of the first insulating member disposed on the fourth electrode. This ensures that the projection of the first insulating member disposed on the fourth electrode in the first direction covers both the second electrode and the solid electrolyte layers on both sides of the second electrode, reducing the risk of overlap between the connection portion of the first electrode tab of the fourth electrode and the adjacent second electrode.

[0029] In some embodiments, along a third direction, the first insulating member extends beyond at least one edge of the first electrode tab, and the first direction, the second direction, and the third direction are not coplanar and intersect each other. Increasing the size of the first insulating member in the third direction reduces the risk of overlap between the connection portion and the second electrode plate.

[0030] In some embodiments, along a third direction, the first insulating member extends beyond the two opposite edges of the first electrode tab. This further increases the size of the first insulating member in the third direction, allowing it to cover a larger area of ​​the surface of the connector and reducing the risk of overlap between the connector and the second electrode.

[0031] In some embodiments, along a third direction, the size of the first insulating member is larger than the size of the first tab. This provides redundancy in the first insulating member along the third direction, which allows the first insulating member to cover a larger area of ​​the surface of the connecting portion after being disposed thereon.

[0032] In some embodiments, the insulating element includes a second insulating element, with the first and second insulating elements respectively disposed on opposite sides of the first electrode tab in the thickness direction. The second insulating element allows more surface area of ​​the first electrode tab to be covered, further reducing the risk of overlap between the first electrode tab and the second electrode plate.

[0033] In some embodiments, along a third direction, both the first insulating member and the second insulating member extend beyond at least one edge of the first electrode tab, and the first direction, the second direction, and the third direction are not coplanar and intersect each other; wherein the portions of the first insulating member and the second insulating member extending beyond the same edge of the first electrode tab along the third direction are connected to each other. This enhances the firmness of the first insulating member disposed on the first electrode tab and reduces the risk of the first insulating member detaching from the first electrode tab. Furthermore, since the first insulating member and the second insulating member are entirely in a state of covering the first electrode tab, the risk of the connection portion of the first electrode tab overlapping with the second electrode sheet can be further reduced.

[0034] In some embodiments, the first insulating element is an insulating tape disposed on the first electrode. This structure has low manufacturing cost and is easy to connect to the first electrode.

[0035] In some embodiments, the first insulating element is an insulating coating disposed on the first electrode. This structure provides a high connection strength between the first insulating element and the first electrode, and the first insulating element is not easily detached from the first electrode.

[0036] In some embodiments, the insulating member includes a third insulating member disposed on the second electrode plate, with at least a portion of the third insulating member disposed between the connecting portion and the first end along the first direction. By disposing the third insulating member on the second electrode plate and at least partially disposing it between the connecting portion and the first end, the risk of overlap between the connecting portion and the second electrode plate can be reduced, and stable insulation between the connecting portion and the second electrode plate can be achieved. Furthermore, the third insulating member is less likely to affect the bending of the first electrode tab.

[0037] In some embodiments, the third insulating member completely covers the first end. This increases the area covered by the third insulating member at the first end, reducing the risk of the connection portion overlapping with the second electrode.

[0038] In some embodiments, along the second direction, two solid electrolyte layers are respectively disposed on the two opposite surfaces of the second electrode; in a projection plane perpendicular to the first direction, the orthographic projections of the two solid electrolyte layers partially overlap with the orthographic projection of the third insulating member. This increases the coverage area of ​​the third insulating member and reduces the risk of the connection portion overlapping with the second electrode.

[0039] In some embodiments, the third insulating element is an insulating coating disposed at the first end. This structure provides a high connection strength between the third insulating element and the second electrode, and the third insulating element is not easily detached from the second electrode.

[0040] In some embodiments, the electrode assembly includes a plurality of second electrode plates arranged along a second direction, with a first electrode plate disposed between two adjacent second electrode plates. A third insulating member covers the first ends of the plurality of second electrode plates and has a hollowed-out area. The connecting portion of each first electrode tab passes through the corresponding hollowed-out area. The hollowed-out area of ​​the third insulating member allows the first electrode tab to pass through, facilitating connection between the first electrode tab and other components. One third insulating member can achieve insulation isolation between the plurality of second electrode plates and the corresponding first electrode tab, effectively improving the arrangement efficiency of the third insulating member.

[0041] In some embodiments, the hollow area includes a through hole extending through the third insulating member along a first direction. By providing a through hole in the third insulating member, the first electrode tab can be easily passed through, and a large area of ​​the first end can be covered.

[0042] In some embodiments, along the first direction, the first main body region has a second end, a first tab is connected to the second end, and the second electrode includes a second overhanging region extending beyond the second end. The end of the second overhanging region facing the connection portion is the first end. In a projection plane perpendicular to the second direction, the orthographic projection of the second overhanging region partially overlaps with the orthographic projection of the solid electrolyte layer. This increases the size of the solid electrolyte layer along the first direction, resulting in better separation between the first electrode and the second electrode.

[0043] In some embodiments, the electrode assembly is a stacked structure, comprising a plurality of first electrodes and a plurality of second electrodes, which are stacked along a second direction. This stacked electrode assembly achieves higher volumetric energy density and better thermal stability.

[0044] Secondly, embodiments of this application provide a battery device, including the battery cell provided in any one of the embodiments of the first aspect.

[0045] Thirdly, embodiments of this application provide an electrical device, including a battery cell provided in any one of the embodiments of the first aspect or a battery device provided in any one of the embodiments of the second aspect, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0048] Figure 2 Exploded views of battery devices provided in some embodiments of this application;

[0049] Figure 3 Exploded views of a single battery cell provided in some embodiments of this application;

[0050] Figure 4 for Figure 3 The image shows an isometric view of a single battery cell;

[0051] Figure 5 for Figure 4 A cross-sectional view of the battery cell shown in Figure AA;

[0052] Figure 6 This is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0053] Figure 7 for Figure 6 A magnified view of a section at point B in the middle;

[0054] Figure 8 for Figure 6 A partial view of the first pole piece shown;

[0055] Figure 9 for Figure 7 The structural view of the first pole piece is shown below;

[0056] Figure 10 for Figure 7 The diagram shows the structure of the second electrode.

[0057] Figure 11 Partial views of electrode assemblies provided for some embodiments of this application;

[0058] Figure 12 Partial views of electrode assemblies provided for other embodiments of this application;

[0059] Figure 13 for Figure 12 The diagram shows the structure of the first insulating component.

[0060] Figure 14 A partial view of an electrode assembly provided for some embodiments of this application;

[0061] Figure 15 for Figure 14 The diagram shows the structure of the first insulating component.

[0062] Figure 16 for Figure 14 The diagram shows the connection between the first insulating element and the first electrode plate.

[0063] Figure 17A partial view of an electrode assembly provided for some embodiments of this application;

[0064] Figure 18 for Figure 17 The diagram shows the connection between the first insulating element and the first electrode plate.

[0065] Figure 19 for Figure 6 A partial view of the top area of ​​the electrode assembly shown;

[0066] Figure 20 This is a schematic diagram showing the connection between the first electrode and the first insulating member provided in some embodiments of this application;

[0067] Figure 21 Partial view of the electrode assembly provided for other embodiments of this application;

[0068] Figure 22 This is a schematic diagram of the structure of an electrode assembly provided in other embodiments of this application;

[0069] Figure 23 for Figure 22 A magnified view of a section at point C;

[0070] Figure 24 This application provides schematic diagrams of the structure of electrode assemblies in some of its embodiments.

[0071] Figure 25 for Figure 24 A magnified view of a section at point D;

[0072] Figure 26 for Figure 25 A cross-sectional view of the third insulating component shown;

[0073] Figure 27 for Figure 26 The third insulating element shown is viewed from direction E.

[0074] Figure 28 This is a schematic diagram of the structure of an electrode assembly provided in some embodiments of this application;

[0075] Figure 29 for Figure 28 A magnified view of a section at point F.

[0076] Icons: 1-Outer shell; 11-Housing shell; 12-End cap; 2-Electrode assembly; 21-First electrode; 211-First main body region; 2111-Second end; 2112-First active material layer; 21121-Main body portion; 21122-Thinned portion; 2113-First current collector layer; 2114-Insulating layer; 212-First electrode tab; 2121-Connecting portion; 21211-First connecting portion; 21211a-First surface; 21212-Second connecting portion; 21212a-Second surface; 2122-Converging portion; 2123-First edge; 2124-Second edge; 22-Second electrode; 221-Second main body region; 2211-First end; 2212-Second active material layer; 2213-Second electrode; 2124-Second edge; 22-Second electrode; 221-Second main body region; 2211-First end; 2212-Second active material layer; 2213-Second electrode; 2121-Second active material layer; 2212-Second active material layer; 2213-Second active material layer; 21 ... Current collector layer; 2214-Second overrun area; 222-Second electrode tab; 23-Solid electrolyte layer; 231-First overrun area; 24-Insulator; 241-First insulating component; 2411-First insulating part; 24111-First section; 24112-Second section; 2412-Second insulating part; 242-Second insulating component; 243-Third insulating component; 2431-Hollowed-out area; 25-Collapsing area; 26-Third electrode; 27-Fourth electrode; 3-Electrode terminal; 10-Battery cell; 20-Casing; 201-First casing; 202-Second casing; 100-Battery assembly; 200-Controller; 300-Motor; 1000-Vehicle; Z-First direction; Y-Second direction; X-Third direction. Detailed Implementation

[0077] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0078] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0079] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0080] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0081] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0082] In this application, "multiple" means two or more (including two).

[0083] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0084] Battery cells include, but are not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0085] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the risk of short circuits while allowing active ions to pass through.

[0086] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on at least one surface of the positive current collector.

[0087] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0088] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors 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 substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0089] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may 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, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.7 Co 0.1 Mn 0.1 O2 (also known as NCM) 711 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0090] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0091] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0092] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Foamed metal can be nickel foam, copper foam, aluminum foam, foam alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0093] As an example, the negative electrode sheet may include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0094] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0095] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0096] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0097] In some embodiments, the separator is a solid electrolyte layer. The solid electrolyte layer is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0098] The solid electrolyte layer includes polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0099] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0100] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0101] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0102] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0103] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0104] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells, such as hexagonal prismatic battery cells.

[0105] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0106] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging multiple battery cells and fixing them together to form an independent module.

[0107] As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0108] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0109] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0110] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0111] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0112] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0113] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0114] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0115] For a typical battery cell, it may include a casing and an electrode assembly, with the electrode assembly and electrolyte housed within the casing. The electrode assembly may include a first electrode, a separator, and a second electrode. The first and second electrodes have opposite polarities, and the separator is disposed between the first and second electrodes to separate them. The tabs of the first and second electrodes are generally in a bent state. To reduce the risk of overlap between the tabs and the ends of the opposite polarity electrode, the separator can be bent to the ends of the electrodes to insulate and isolate the tabs from the opposite polarity electrode.

[0116] In a solid-state battery cell, the solid electrolyte layer acts as a separator between the first and second electrodes. The solid electrolyte layer is generally difficult to bend to the ends of the electrodes. A bent tab can easily overlap with the end of an electrode of opposite polarity, causing a short circuit between the first and second electrodes and affecting the reliability of the battery cell.

[0117] In view of this, embodiments of this application provide a battery cell, which includes a casing and an electrode assembly housed within the casing. The electrode assembly includes a first electrode, a second electrode, a solid electrolyte layer, and an insulating member. The first electrode includes a first main body region and a first tab, the first tab being disposed at one end of the first main body region along a first direction. The first tab includes a convergent portion and a connecting portion connected in sequence, the convergent portion being used to connect with the convergent portion of an adjacent first tab, and the connecting portion connecting the convergent portion and the first main body region. The second electrode has the opposite polarity to the first electrode, and along the first direction, the end of the second electrode closer to the first tab is designated as the first end. The solid electrolyte layer is disposed between the first and second electrodes along a second direction, the second direction intersecting the first direction. The insulating member is at least partially disposed between the connecting portion and the first end along the first direction to insulate and isolate the connecting portion and the second electrode.

[0118] In such a battery cell, an insulating member is at least partially disposed between the connecting portion and the first end along the first direction. The insulating member can insulate and isolate the connecting portion of the first electrode tab from the second electrode, thereby reducing the risk of short circuit between the first electrode and the second electrode caused by the connecting portion overlapping with the first end, and effectively improving the reliability of the battery cell.

[0119] The battery cells described in this application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0120] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0121] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. A battery device 100 is disposed inside the vehicle 1000, and the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000.

[0122] The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the power needs of the vehicle 1000 during startup, navigation and driving.

[0123] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0124] Please refer to Figure 2 , Figure 2 The following is an exploded view of a battery device 100 provided in some embodiments of this application. The battery device 100 may include a battery cell 10 and a housing 20, the housing 20 being used to house the battery cell 10.

[0125] The housing 20 has an enclosed space inside for accommodating the battery cells 10. The housing 20 can have various structures. In some embodiments, the housing 20 may include a first housing 201 and a second housing 202, which are interlocked. The first housing 201 and the second housing 202 can have various shapes, such as cuboids or cylinders. The first housing 201 can be a hollow structure open on one side, and the second housing 202 can also be a hollow structure open on one side. The open side of the second housing 202 interlocks with the open side of the first housing 201, thus forming a housing 20 with an enclosed space. Alternatively, the first housing 201 can be a hollow structure open on one side, and the second housing 202 can be a plate-like structure, with the second housing 202 interlocked with the open side of the first housing 201, thus forming a housing 20 with a accommodating space.

[0126] In the battery device 100, there can be one or more battery cells 10. If there are multiple battery cells 10, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 10 are connected in both series and parallel. Alternatively, multiple battery cells 10 can be first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 20. Another option is that all battery cells 10 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 10 is housed within the housing 20.

[0127] Please refer to Figures 3-5 , Figure 3 Exploded views of a battery cell 10 provided in some embodiments of this application; Figure 4 for Figure 3 The isometric view of the battery cell 10 shown; Figure 5 for Figure 4The diagram shows a cross-sectional view (AA) of the battery cell 10. The battery cell 10 may include a housing 1 and an electrode assembly 2, which is housed within the housing 1.

[0128] In some embodiments, the housing 1 may include a housing 11 and an end cap 12, the housing 11 having an opening, and the end cap 12 closing the opening of the housing 11. Here, "closed" means covered or shut, and can be either sealed or unsealed.

[0129] The housing 11 is a component used to house the electrode assembly 2. The housing 11 can be a hollow structure with an opening at one end, or it can be a hollow structure with openings at both opposite ends. The housing 11 can have various shapes, such as cylindrical or cuboid. The housing 11 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The electrode assembly 2 can be partially or completely housed within the housing 11.

[0130] The end cap 12 and the housing 11 together define a receiving space for accommodating the electrode assembly 2 and other components. The end cap 12 can be connected to the housing 11 by welding, rolling, or other methods to close the opening of the housing 11. The shape of the end cap 12 can be adapted to the shape of the housing 11. For example, if the housing 11 is a cuboid structure, the end cap 12 can be a rectangular plate structure adapted to the housing 11; or if the housing 11 is a cylindrical structure, the end cap 12 can be a circular plate structure adapted to the housing 11. The end cap 12 can also be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy. The end cap 12 and the housing 11 can be made of the same or different materials.

[0131] In an embodiment where the housing 11 has an opening at one end, one end cap 12 may be provided accordingly. In an embodiment where the housing 11 has openings at both opposite ends, two end caps 12 may be provided accordingly. The two end caps 12 respectively close the two openings of the housing 11, and the two end caps 12 and the housing 11 together define the receiving space.

[0132] In some embodiments, the battery cell 10 may further include electrode terminals 3, which are disposed on the housing 1 and are used for electrical connection with the tabs of the electrode assembly 2 to input or output electrical energy of the battery cell 10. The electrode terminals 3 may be disposed on the housing 11 of the housing 1 or on the end cap 12 of the housing 1. The electrode terminals 3 and the tabs may be directly connected, for example, by welding the electrode terminals 3 to the tabs. Alternatively, the electrode terminals 3 and the tabs may be indirectly connected, for example, by a current collector. The current collector may be a metallic conductor, such as copper, iron, aluminum, steel, or aluminum alloy.

[0133] As an example, such as Figures 3-5As shown, one end of the housing 11 forms an opening, and there is one end cap 12 in the housing 1, which closes one opening of the housing 11. Two electrode terminals 3 are provided on the end cap 12, which are a positive electrode terminal and a negative electrode terminal, respectively. The end of the electrode assembly 2 facing the end cap 12 has a positive electrode tab and a negative electrode tab. 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.

[0134] Please refer to Figures 6-10 , Figure 6 This is a schematic diagram of the structure of electrode assembly 2 provided in some embodiments of this application; Figure 7 for Figure 6 A magnified view of a section at point B in the middle; Figure 8 for Figure 6 A partial view of the first pole piece 21 shown; Figure 9 for Figure 7 The structural view of the first pole piece 21 shown; Figure 10 for Figure 7 The diagram shows the structure of the second electrode 22. This application provides a battery cell 10, which includes a housing 1 and an electrode assembly 2, the electrode assembly 2 being housed within the housing 1. The electrode assembly 2 includes a first electrode 21, a second electrode 22, a solid electrolyte layer 23, and an insulating member 24. The first electrode 21 includes a first main body region 211 and a first tab 212. The first tab 212 is disposed at one end of the first main body region 211 along a first direction Z. The first tab 212 includes a convergent portion 2122 and a connecting portion 2121 connected in sequence. The convergent portion 2122 is used to connect with the convergent portion 2122 of an adjacent first tab 212, and the connecting portion 2121 connects the convergent portion 2122 to the first main body region 211. The second electrode 22 has the opposite polarity to the first electrode 21. Along the first direction Z, the end of the second electrode 22 closest to the first tab 212 is the first end 2211. A solid electrolyte layer 23 is disposed between the first electrode 21 and the second electrode 22 along the second direction Y, which intersects with the first direction Z. An insulating member 24 is disposed at least partially along the first direction Z between the connecting portion 2121 and the first end 2211 to insulate and isolate the connecting portion 2121 and the second electrode 22.

[0135] Electrode assembly 2 can be a stacked structure, i.e., a stacked electrode assembly where the first electrode 21, solid electrolyte layer 23, and second electrode 22 are stacked to form a stacked structure, and the stacking direction of the first electrode 21, solid electrolyte layer 23, and second electrode 22 is parallel to the second direction Y. Electrode assembly 2 can also be a wound structure, i.e., a wound electrode assembly where the first electrode 21, solid electrolyte layer 23, and second electrode 22 are wound to form a wound structure. In the wound electrode assembly, electrode assembly 2 can include a straight region and a bent region. Bend regions can be provided at both ends of the straight region, and the stacking direction of the first electrode 21, solid electrolyte layer 23, and second electrode 22 located in the straight region is parallel to the second direction Y. Figure 6 In the illustrated embodiment, the electrode assembly 2 has a stacked structure, with multiple first electrode 21, second electrode 22, and solid electrolyte layer 23.

[0136] One of the first electrode 21 and the second electrode 22 is the positive electrode, and the other is the negative electrode. It can be understood that the first electrode 21 can be the positive electrode and the second electrode 22 the negative electrode; or the first electrode 21 can be the negative electrode and the second electrode 22 the positive electrode. There can be one or more first electrodes; there can be one or more second electrodes.

[0137] The second electrode 22 may include a second main body region 221 and a second tab 222. The second tab 222 is disposed at one end of the second main body region 221 along a first direction Z. The second main body region 221 and the first main body region 211 are arranged along a second direction Y. At least a portion of the solid electrolyte layer 23 is disposed between the first main body region 211 and the second main body region 221. Along the first direction Z, the end of the second main body region 221 near the first tab 212 is the first end 2211 of the second electrode 22. Along the first direction Z, the first tab 212 and the second tab 222 may be located at the same end of the electrode assembly 2, or they may be located at opposite ends of the electrode assembly 2. As an example, in Figures 7-10 In the illustrated embodiment, along the first direction Z, the first tab 212 and the second tab 222 are located at the same end of the electrode assembly 2. The end of the second main body region 221 where the second tab 222 is disposed is the first end 2211. The first tab 212 and the second tab 222 are spaced apart along the third direction X. The first direction Z, the second direction Y and the third direction X intersect each other. Any two of the first direction Z, the second direction Y and the third direction X can be arranged at an acute angle, a right angle or an obtuse angle.

[0138] like Figure 7As shown, the first main body region 211 may include a first active material layer 2112 and a first current collector layer 2113. The first current collector layer 2113 has the first active material layer 2112 disposed on at least one surface in the thickness direction. A first tab 212 is connected to the first current collector layer 2113. The first tab 212 and the first current collector layer 2113 can be integrally formed and together constitute the first current collector. The dimension of the first tab 212 along the third direction X can be smaller than the dimension of the first current collector layer 2113 along the third direction X. It can be understood that if the first electrode 21 is a positive electrode, then the first active material layer 2112 includes a positive active material, and the first current collector is a positive current collector; if the first electrode 21 is a negative electrode, then the first active material layer 2112 includes a negative active material, and the first current collector is a negative current collector.

[0139] like Figure 8 As shown, the second main body region 221 may include a second active material layer 2212 and a second current collector layer 2213. The second current collector layer 2213 has the second active material layer 2212 disposed on at least one surface in the thickness direction. A second tab 222 is connected to the second current collector layer 2213. The second tab 222 and the second current collector layer 2213 can be integrally formed and together constitute the second current collector. The dimension of the second tab 222 along the third direction X can be smaller than the dimension of the second current collector layer 2213 along the third direction X. Along the first direction Z, the end of the second current collector layer 2213 near the first tab 212 can be located at the first end 2211, and the end of the second active material layer 2212 near the first tab 212 can be located at the first end 2211, or it can be further away from the first tab 212 than the first end 2211. It is understandable that if the second electrode 22 is a positive electrode, then the second active material layer 2212 includes a positive active material and the second current collector is a positive current collector; if the second electrode 22 is a negative electrode, then the second active material layer 2212 includes a negative active material and the second current collector is a negative current collector.

[0140] In electrode assembly 2, there are multiple first tabs 212, and the convergence portions 2122 of the multiple first tabs 212 are connected to form a convergence area 25. The convergence area 25 is used to connect with other components, such as current collectors or electrode terminals 3. In an embodiment where electrode assembly 2 has a stacked structure, there are multiple first electrodes 21, and the convergence portions 2122 of the first tabs 212 of the multiple first electrodes 21 are connected. It can be understood that the convergence portion 2122 of the first tab 212 of one first electrode 21 is used to connect with the convergence portion 2122 of the first tab 212 of the adjacent first electrode 21. In an embodiment where the electrode assembly 2 is a wound structure, there can be one first electrode 21, and the first electrode 21 can be provided with multiple first electrode tabs 212. The multiple first electrode tabs 212 of the first electrode 21 are arranged at intervals along the winding direction of the first electrode 21. It can be understood that the closing portion 2122 of the first electrode tab 212 is used to connect with the closing portion 2122 of the adjacent first electrode tab 212 in the same first electrode 21.

[0141] The first tab 212 can be bent to form a folding portion 2122 and a connecting portion 2121. A portion of the connecting portion 2121 is disposed opposite to the first end 2211 along the first direction Z, that is, the projection of the first connecting portion 21211 along the first direction Z covers at least a portion of the first end 2211. At least a portion of the insulating member 24 is disposed between the portion of the connecting portion 2121 disposed opposite to the first end 2211 along the first direction Z and the first end 2211.

[0142] The insulating member 24 is made of insulating material. Along the first direction Z, the insulating member 24 may be entirely located between the first end 2211 and the connecting portion 2121, or only a portion of it may be located between the first end 2211 and the connecting portion 2121. The insulating member 24 may be connected to the first electrode 21, for example, the insulating member 24 may be connected to the first main body region 211 and / or the first electrode tab 212; the insulating member 24 may also be connected to the second electrode 22, for example, the insulating member 24 may be connected to the first end 2211 of the second electrode 22.

[0143] In this embodiment, the insulating member 24 is at least partially disposed between the connecting portion 2121 and the first end 2211 along the first direction Z. The insulating member 24 can insulate and isolate the connecting portion 2121 of the first electrode tab 212 from the second electrode 22, thereby reducing the risk of short circuit between the first electrode 21 and the second electrode 22 caused by the connecting portion 2121 overlapping with the first end 2211, and effectively improving the reliability of the battery cell 10.

[0144] In some embodiments, please refer to Figure 11 , Figure 11This is a partial view of the electrode assembly 2 provided in some embodiments of this application. The insulating member 24 includes a first insulating member 241 disposed on the connecting portion 2121 along the first direction Z, at least a portion of the first insulating member 241 being located between the connecting portion 2121 and the first end 2211.

[0145] The first insulating element 241 is made of insulating material. The first insulating element 241 can be a part of the insulating element 24, or the first insulating element 241 can be the same as the insulating element 24. The first insulating element 241 can be of uniform thickness or of non-uniform thickness; for example, a portion of the first insulating element 241 may be thicker than another portion. Along the first direction Z, the first insulating element 241 can be partially disposed between the connecting portion 2121 and the first end 2211, or it can be entirely disposed between the connecting portion 2121 and the first end 2211.

[0146] The first insulating member 241 may be connected to the connecting portion 2121 to fix the first insulating member 241 to the connecting portion 2121. The first insulating member 241 may cover part or all of the surface of the connecting portion 2121 facing the first end 2211 to separate the connecting portion 2121 and the first end 2211.

[0147] By placing the first insulating member 241 on the connecting portion 2121 and positioning at least a portion of the first insulating member 241 between the connecting portion 2121 and the first end 2211, the risk of the surface of the connecting portion 2121 facing the first end 2211 coming into contact with the first end 2211 can be reduced, thus achieving stable insulation between the connecting portion 2121 and the second electrode 22. Furthermore, after the first electrode 21 is formed, the first insulating member 241 can be placed on the first electrode tab 212 first, and then the electrode assembly 2 can be formed using the first electrode 21, the second electrode 22, and the solid electrolyte layer 23, reducing the difficulty of arranging the first insulating member 241.

[0148] In some embodiments, please continue to refer to Figure 11 The connecting portion 2121 is bent to form a first connecting portion 21211 and a second connecting portion 21212 that are connected to each other. The first connecting portion 21211 and the closing portion 2122 ( Figure 8 (As shown in the diagram) The second connecting portion 21212 is connected to the first main body region 211. Along the first direction Z, the first connecting portion 21211 is disposed opposite to the first end 2211. The first connecting portion 21211 has a first surface 21211a facing the first end 2211. At least a portion of the first insulating member 241 is located between the first connecting portion 21211 and the first end 2211, and covers at least a portion of the first surface 21211a.

[0149] The first connecting portion 21211, the second connecting portion 21212, and the closing portion 2122 can be three segments formed by bending the first tab 212. The first connecting portion 21211, the second connecting portion 21212, and the closing portion 2122 can all extend along a straight line. The bending position of the first tab 212 can form an arc segment. The first connecting portion 21211 and the second connecting portion 21212 can be connected by one arc segment, and the first connecting portion 21211 and the closing portion 2122 can be connected by another arc segment. The first connecting portion 21211 and the second connecting portion 21212 are set at an angle; the angle can be acute, right, or obtuse. The extension direction of the second connecting portion 21212 can be parallel to the first direction Z, or it can be set at a non-zero angle with the first direction Z. The first connecting portion 21211 and the closing portion 2122 are set at an angle. The first connecting portion 21211 and the closing portion 2122 can be set at an acute angle, a right angle or an obtuse angle. The extension direction of the closing portion 2122 can be parallel to the first direction Z, or it can be set at a non-zero angle with the first direction Z. For example, the extension direction of the closing portion 2122 is perpendicular to the first direction Z.

[0150] The first insulating member 241 may be entirely disposed on the first connecting portion 21211, or a portion of the first insulating member 241 may be disposed on the first connecting portion 21211, with another portion of the first insulating member 241 disposed on the gathering portion 2122 and / or the second connecting portion 21212 and / or the first main body area 211. The first insulating member 241 may cover a portion of the first surface 21211a, or it may cover the entire first surface 21211a. As an example, the first surface 21211a is a plane.

[0151] The connecting portion 2121 has a bent structure. After the connecting portion 2121 is bent, the first connecting portion 21211 and the first end 2211 of the connecting portion 21211 are in a state of opposite direction Z along the first direction. The first surface 21211a of the first connecting portion 21211 facing the first end 2211 contacts the first end 2211, which increases the risk of short circuit between the first electrode 21 and the second electrode 22. However, by disposing at least a portion of the first insulating member 241 between the first connecting portion 21211 and the first end 2211 and covering at least a portion of the first surface 21211a, the risk of contact between the first surface 21211a of the first connecting portion 21211 and the first end 2211 can be effectively reduced, thereby reducing the risk of short circuit between the first electrode 21 and the second electrode 22.

[0152] In some embodiments, please continue to refer to Figure 11Along the second direction Y, the second connecting portion 21212 has a second surface 21212a facing the second electrode 22, the second surface 21212a is connected to the first surface 21211a, and the first insulating member 241 covers at least a portion of the second surface 21212a.

[0153] The first insulating element 241 may cover a portion of the second surface 21212a, or it may cover the entire first insulating element 241.

[0154] As an example, the second surface 21212a is a plane, and the first surface 21211a and the second surface 21212a are connected by an arc surface. The surface of the arc segment connecting the first connecting portion 21211 and the second connecting portion 21212 facing the second electrode plate 22 is this arc surface. The first insulating member 241 covers at least a portion of this arc surface. It can be understood that a portion of the first insulating member 241 is disposed on the first surface 21211a, a portion is disposed on the arc surface, and a portion is disposed on the second surface 21212a.

[0155] In this embodiment, the first insulating member 241 covers the second surface 21212a of the second connecting portion 21212, so that the first insulating member 241 can both separate the first connecting portion 21211 and the second electrode 22, and also separate the second connecting portion 21212 and the second electrode 22, reducing the risk of short circuit between the first electrode 21 and the second electrode 22 due to contact between the second surface 21212a of the second connecting portion 21212 and the second electrode 22.

[0156] In some embodiments, please continue to refer to Figure 11 Along the first direction Z, the first main body region 211 has a second end 2111, a first tab 212 is connected to the second end 2111, and the solid electrolyte layer 23 includes a first overhang region 231 extending beyond the second end 2111. Along the second direction Y, a portion of the first insulating member 241 is located between the first overhang region 231 and the connecting portion 2121.

[0157] Along the first direction Z, the end of the first current collector layer 2113 near the first tab 212 can be located at the second end 2111, and the end of the first active material layer 2112 near the first tab 212 can be located at the second end 2111, or it can be farther away from the first tab 212 than the second end 2111.

[0158] The first extended region 231 is the portion of the solid electrolyte layer 23 that extends beyond the second end 2111 along the direction from the first main body region 211 toward the first tab 212. In a projection plane perpendicular to the second direction Y, the orthographic projection of the first extended region 231 overlaps with the orthographic projection of the connecting portion 2121.

[0159] Along the second direction Y, the portion of the first insulating member 241 located between the first extended area 231 and the connecting portion 2121 may contact the first extended area 231 and / or the connecting portion 2121, or may form a gap between the first extended area 231 and / or the connecting portion 2121. Along the first direction Z, the first insulating member 241 may abut against the second end 2111, or may form a gap between the first insulating member 241 and the second end 2111.

[0160] As an example, in Figure 11 In the illustrated embodiment, along the second direction Y, the first extending region 231 and the second connecting portion 21212 are disposed opposite each other. A portion of the first insulating member 241 is located between the first extending region 231 and the second connecting portion 21212. The portion of the first insulating member 241 located between the first extending region 231 and the second connecting portion 21212 forms a gap with the first extending region 231 and is connected to the second surface 21212a of the second connecting portion 21212. Along the first direction Z, the first insulating member 241 abuts against the second end 2111.

[0161] In this embodiment, along the second direction Y, a portion of the first insulating member 241 is located between the first extended area 231 and the connecting portion 2121, making the first insulating member 241 longer in the extension direction of the first electrode tab 212, increasing the coverage area of ​​the first insulating member 241 covering the surface of the connecting portion 2121. The first insulating member 241 can play a better separating role between the connecting portion 2121 and the second electrode 22, reducing the risk of overlap between the connecting portion 2121 and the second electrode 22.

[0162] In some embodiments, please refer to Figure 12 , Figure 12 This is a partial view of the electrode assembly 2 provided in some other embodiments of this application. Along the second direction Y, the portion of the first insulating member 241 located between the first extended region 231 and the connecting portion 2121 abuts against the first extended region 231 and the connecting portion 2121.

[0163] It is understandable that the portion of the first insulating member 241 located between the first extended area 231 and the connecting portion 2121 remains in contact with both the first extended area 231 and the connecting portion 2121.

[0164] During the molding of electrode assembly 2, pressure is generally applied to ensure that both the first electrode 21 and the second electrode 22 are in close contact with the solid electrolyte layer 23. For example, isostatic pressing is applied to electrode assembly 2. During this process, the solid electrolyte layer 23 is easily cracked or sheared by the edge of the first electrode 21 at the second end 2111. In this embodiment, the portion of the first insulating member 241 located between the first extended area 231 and the connecting portion 2121 can support the first extended area 231 and the connecting portion 2121, maintaining a certain distance between the first extended area 231 and the connecting portion 2121 in the second direction Y. This reduces the risk that the solid electrolyte layer 23 will be cracked or sheared by the edge of the first main body area 211 at the second end 2111 during the molding of electrode assembly 2.

[0165] In some embodiments, along the first direction Z, the first body region 211 has a second end 2111, and a first tab 212 is connected to the second end 2111. The first insulating member 241 includes a first insulating portion 2411, which is connected to the second end 2111 and extends along the extending direction of the first tab 212. Along the first direction Z, at least a portion of the first insulating portion 2411 is located between the connecting portion 2121 and the first end 2211.

[0166] The first insulating portion 2411 is the part of the first insulating member 241 that extends from the second end 2111 along the extending direction of the first electrode 21. The extending direction of the first insulating portion 2411 is consistent with the extending direction of the first electrode tab 212. The first insulating portion 2411 may be a part of the first insulating member 241, or the first insulating member 241 may consist only of the first insulating portion 2411, in which case the first insulating portion 2411 is the first insulating member 241.

[0167] As an example, the first insulating portion 2411 has a bent structure, and the first insulating portion 2411 is bent together with the connecting portion 2121. A portion of the first insulating portion 2411 extends along the second connecting portion 21212, and another portion extends along the first connecting portion 21211. The portion of the first insulating portion 2411 extending along the first connecting portion 21211 is located between the first connecting portion 21211 and the first end 2211 in the first direction Z.

[0168] In this embodiment, the first insulating portion 2411 is connected to the second end 2111 and extends along the extension direction of the first tab 212, making the first insulating portion 2411 longer along the extension direction of the first tab 212, increasing the coverage area of ​​the first insulating portion 2411 covering the surface of the connecting portion 2121, and reducing the risk of the connecting portion 2121 overlapping with the second electrode 22.

[0169] In some embodiments, along the second direction Y, the first electrode 21 and the second electrode 22 are alternately arranged, with one more second electrode 22 than the first electrode 21. Along the extension direction of the first tab 212, the length of the first insulating portion 2411 is H, where Q ≤ H ≤ 2Q. If N is an even number, Q = M1 × N / 2 + M2 × (N-1) / 2 + M3 × (N-1); or if N is an odd number, Q = M1 × (N-1) / 2 + M2 × (N-1) / 2 + M3 × (N-1). The number of first electrodes 21 in the electrode assembly 2 is N; the thickness of the first electrode 21 is M1, the thickness of the second electrode 22 is M2, and the thickness of the solid electrolyte layer 23 is M3.

[0170] The thickness of the first electrode 21 is the same as the thickness of the first main body region 211, and the thickness of the second electrode 22 is the same as the thickness of the second main body region 221. It can be understood that a solid electrolyte layer 23 is disposed between adjacent first electrode 21 and second electrode 22.

[0171] If the first insulating portion 2411 is bent into multiple segments, the length of each segment can be measured separately, and the sum of the lengths of the segments is the length of the first insulating portion 2411 along the extending direction of the first tab 212. Alternatively, the first insulating portion 2411 in the bent state can be straightened, and the length of the first insulating portion 2411 in the straight state can be measured. This length is the length of the first insulating portion 2411 along the extending direction of the first tab 212.

[0172] In this embodiment, the length of the first insulating portion 2411 is designed according to the number of first electrode plates 21 and the thickness of the first electrode plate 21, the second electrode plate 22 and the solid electrolyte layer 23, so that the first insulating portion 2411 has sufficient length, thereby allowing a portion of the first insulating portion 2411 to extend between the connecting portion 2121 and the first end 2211, so as to effectively separate the connecting portion 2121 and the second electrode plate 22 in the first direction Z.

[0173] In some embodiments, the solid electrolyte layer 23 includes a first overhang region 231 extending beyond the second end 2111. Along the second direction Y, a portion of the first insulating portion 2411 is located between the first overhang region 231 and the connecting portion 2121, and abuts against the first overhang region 231 and the connecting portion 2121.

[0174] The first insulating part 2411 can be of equal thickness or of non-equal thickness.

[0175] As an example, in Figure 12In the illustrated embodiment, along the second direction Y, a portion of the first insulating portion 2411 is located between the first extending region 231 and the second connecting portion 21212. The portion of the first insulating portion 2411 located between the first extending region 231 and the second connecting portion 21212 abuts against the first extending region 231 and the second connecting portion 21212, and abuts against the second end 2111.

[0176] In this embodiment, the first insulating part 2411 is connected to the second end 2111 and is partially located between the first extended area 231 and the connecting part 2121, so that the first insulating part 2411 can provide stable support for the first extended area 231 and the connecting part 2121, and keep the first extended area 231 and the connecting part 2121 at a certain distance in the second direction Y, thereby reducing the risk that the solid electrolyte layer 23 will be cracked or sheared by the edge of the first main body area 211 located at the second end 2111 during the forming process of the electrode assembly 2.

[0177] In some embodiments, please refer to Figure 12 and Figure 13 , Figure 13 for Figure 12 The diagram shows the structure of the first insulating member 241. The first insulating portion 2411 includes a first portion 24111 and a second portion 24112. The first portion 24111 is disposed on the connecting portion 2121, and at least a portion of the first portion 24111 is located between the connecting portion 2121 and the first end 2211 along the first direction Z. The second portion 24112 is connected to the first portion 24111 and connected to the second end 2111. The thickness of the second portion 24112 is greater than the thickness of the first portion 24111. Along the second direction Y, at least a portion of the second portion 24112 is located between the first extended region 231 and the connecting portion 2121, and abuts against the first extended region 231 and the connecting portion 2121.

[0178] The first part 24111 and the second part 24112 can be integrally formed. Along the first direction Z, the first part 24111 can be partially located between the connecting part 2121 and the first end 2211, or it can be entirely located between the connecting part 2121 and the first end 2211. Along the second direction Y, the second part 24112 can be partially located between the first protruding area 231 and the connecting part 2121, or it can be entirely located between the first protruding area 231 and the connecting part 2121.

[0179] The thickness of the first part 24111 is L1, and the thickness of the second part 24112 is L2, where L1 < L2.

[0180] As an example, in Figure 12In the illustrated embodiment, along the second direction Y, the second portion 24112 is located between the first extended region 231 and the second connecting portion 21212. Along the first direction Z, a portion of the first portion 24111 is located between the first connecting portion 21211 and the first end 2211. A portion of the first portion 24111 extends along the second connecting portion 21212 and connects to the second surface 21212a, and another portion of the first portion 24111 extends along the first connecting portion 21211 and connects to the first surface 21211a.

[0181] In this embodiment, a thicker second portion 24112 is disposed between the first extended area 231 and the connecting portion 2121. The second portion 24112 provides good support for both the first extended area 231 and the connecting portion 2121 in the second direction Y. A thinner first portion 24111 is disposed at the connecting portion 2121. The first portion 24111 has better bending performance to accommodate bending of the connecting portion 2121. This structure allows the first insulating portion 2411 to provide good support for both the first extended area 231 and the connecting portion 2121, and it can bend along with the connecting portion 2121, while also reducing the material used in the first insulating portion 2411, resulting in better economic efficiency.

[0182] In some embodiments, along the first direction Z, the size of the second portion 24112 is d, and the size of the first extended region 231 is D, where 0.1≤d / D≤1.

[0183] d / D can take any one of the following point values ​​or any range between two values: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.

[0184] In this embodiment, d / D ≥ 0.1 ensures that the ratio of the dimension of the second part 24112 along the first direction Z to the dimension of the first protruding area 231 along the first direction Z is not too small. This allows the second part 24112 to provide sufficient support for the first protruding area 231 and the connecting part 2121, reducing the risk of the solid electrolyte layer 23 being cracked or sheared during the molding of the electrode assembly 2. d / D ≤ 1 ensures that the ratio of the dimension of the second part 24112 along the first direction Z to the dimension of the first protruding area 231 along the first direction Z is not too large, reducing the material used in the second part 24112 and improving economic efficiency. Therefore, 0.1 ≤ d / D ≤ 1 balances the support performance and economy of the second part 24112.

[0185] In some embodiments, 2mm ≤ d ≤ 10mm.

[0186] d can be any one of the following values: 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, or any range between two values.

[0187] In this embodiment, d ≥ 2 mm, which makes the size of the second part 24112 along the first direction Z larger, reducing the molding difficulty of the second part 24112 and enabling the second part 24112 to provide sufficient support for the first protruding area 231 and the connecting part 2121. d ≤ 10 mm, which prevents the size of the second part 24112 along the first direction Z from being too large, reducing material waste.

[0188] In some embodiments, please refer to Figure 14 and Figure 15 , Figure 14 Partial view of electrode assembly 2 provided for some embodiments of this application; Figure 15 for Figure 14 The diagram shows the structure of the first insulating member 241. The first insulating member 241 also includes a second insulating portion 2412, which is connected to the second part 24112. The thickness of the second insulating portion 2412 is less than the thickness of the second part 24112. Along the second direction Y, the second insulating portion 2412 is stacked with the first main body region 211.

[0189] The second insulating part 2412 and the first insulating part 2411 can be integrally formed. The thickness of the second insulating part 2412 is b, where b < L2. It can be b = L1, b < L1, or b > L1.

[0190] In this embodiment, the second insulating portion 2412 of the first insulating member 241 is stacked with the first main body region 211 along the second direction Y. This increases the total length of the first insulating member 241, further reducing the risk of overlap between the connecting portion 2121 and the second electrode 22. Furthermore, it increases the contact area between the first insulating member 241 and the first electrode 21, making the first insulating member 241 more stable on the first electrode 21, thus achieving stable insulation between the connecting portion 2121 and the second electrode 22. In addition, since the thickness of the second insulating portion 2412 is less than the thickness of the second portion 24112, the thickness of the second insulating portion 2412 is not excessive, reducing the space occupied by the second insulating portion 2412 in the second direction Y.

[0191] In some embodiments, please continue to refer to Figure 14 and Figure 15 The first insulating member 241 also includes a second insulating part 2412, which is connected to the first insulating part 2411. Along the second direction Y, the second insulating part 2412 is stacked with the first main body area 211.

[0192] Along the second direction Y, the second insulating part 2412 and the area of ​​the first current collecting layer 2113 of the first main body region 211 not covered by the first active material layer 2112 can be stacked, or the second insulating part 2412 and the first active material layer 2112 of the first main body region 211 can be stacked.

[0193] As an example, in a projection plane perpendicular to the second direction Y, the orthographic projection of the second insulating portion 2412 overlaps with the orthographic projection of a portion of the first main body region 211.

[0194] In this embodiment, the second insulating portion 2412 of the first insulating member 241 is stacked with the first main body area 211 along the second direction Y. On the one hand, this increases the total length of the first insulating member 241, further reducing the risk of overlap between the connecting portion 2121 and the second electrode 22. On the other hand, it increases the contact area between the first insulating member 241 and the first electrode 21, making the first insulating member 241 more firmly attached to the first electrode 21, thereby achieving stable insulation between the connecting portion 2121 and the second electrode 22.

[0195] In some embodiments, please refer to Figure 16 , Figure 16 for Figure 14 The diagram shows the connection between the first insulating element 241 and the first electrode 21. The first main body region 211 includes a first current collector layer 2113 and a first active material layer 2112. The first current collector layer 2113 is connected to the first electrode tab 212. The end of the first active material layer 2112 closest to the first electrode tab 212 along the first direction Z is located at the second end 2111. Along the second direction Y, the first current collector layer 2113 faces the solid electrolyte layer 23 (…). Figure 14 A first active material layer 2112 is provided on one side of the part (as shown in the figure), and a second insulating part 2412 is stacked with the first active material layer 2112.

[0196] The first current collector layer 2113 and the first electrode tab 212 can be integrally formed to jointly constitute the first current collector. The first active material layer 2112 can be a structure of uniform thickness or a structure of non-uniform thickness.

[0197] It is understandable that, along the second direction Y, if both sides of the first electrode 21 are provided with a solid electrolyte layer 23, then both sides of the first current collector 2113 are provided with a first active material layer 2112.

[0198] As an example, along the second direction Y, a second electrode 22 is provided on both sides of the first electrode 21. Figure 14As shown in the figure, a first active material layer 2112 is provided on both sides of the first current collector layer 2113, and a second insulating portion 2412 is located between the solid electrolyte layer 23 and the first active material layer 2112. In the projection plane perpendicular to the second direction Y, the orthographic projection of the second insulating portion 2412 overlaps with the orthographic projection of a portion of the first active material layer 2112.

[0199] In this embodiment, the second insulating part 2412 is stacked with the first active material layer 2112, so that the first insulating member 241 provides a certain protection for the edge area of ​​the first active material layer 2112 near the second end 2111, reducing the risk of the edge area of ​​the first active material layer 2112 detaching from the first current collector layer 2113, and reducing the risk of the edge area of ​​the first active material layer 2112 contacting the second electrode 22.

[0200] In some embodiments, please continue to refer to Figure 16 The first active material layer 2112 includes a main body 21121 and a thinning portion 21122. The thinning portion 21122 is disposed at one end of the main body 21121 along the first direction Z near the first tab 212. The thickness of the thinning portion 21122 is less than the thickness of the main body 21121. Along the second direction Y, the second insulating portion 2412 is stacked with the thinning portion 21122.

[0201] It is understandable that the first active material layer 2112 has a non-uniform thickness structure.

[0202] The main body 21121 can be of uniform thickness or of non-uniform thickness. The thinned portion 21122 can be of uniform thickness or of non-uniform thickness. For example, the thickness of the thinned portion 21122 gradually decreases along the direction from the main body 21121 to the thinned portion 21122. In this case, the maximum thickness of the weak portion can be less than or equal to the minimum thickness of the main body 21121, so that the thickness of the thinned portion 21122 is less than the thickness of the main body 21121.

[0203] As an example, the main body 21121 has a uniform thickness structure, and the thinned portion 21122 also has a uniform thickness structure. The second insulating portion 2412 is located in the solid electrolyte layer 23 ( Figure 14 (shown in the figure) and between the thinning portion 21122. In the projection plane perpendicular to the second direction Y, the orthographic projection of the second insulating portion 2412 overlaps with the orthographic projection of a portion of the thinning portion 21122.

[0204] In this embodiment, along the second direction Y, the second insulating portion 2412 and the thinning portion 21122 are stacked, making full use of the gap between the thinning portion 21122 and the solid electrolyte layer 23. This facilitates the tight bonding between the main body portion 21121 of the first active material layer 2112 and the solid electrolyte layer 23, thereby reducing the interfacial impedance between the first electrode 21 and the solid electrolyte layer 23.

[0205] In some embodiments, please refer to Figure 17 and Figure 18 , Figure 17 A partial view of electrode assembly 2 provided for some embodiments of this application; Figure 18 for Figure 17 The diagram shows the connection between the first insulating element 241 and the first electrode 21. The first main body region 211 includes a first current collector 2113, a first active material layer 2112, and an insulating layer 2114. The first current collector 2113 is connected to the first electrode tab 212. The insulating layer 2114 is disposed at one end of the first active material layer 2112 along the first direction Z, close to the first electrode tab 212, and the end of the insulating layer 2114 along the first direction Z, close to the first electrode tab 212, is located at the second end 2111. Along the second direction Y, the first active material layer 2112 and the insulating layer 2114 are disposed on the side of the first current collector 2113 facing the solid electrolyte layer 23, and the second insulating portion 2412 is stacked with the insulating layer 2114.

[0206] The first current collector and the first tab 212 can be integrally formed to constitute the first current collector. The first active material layer 2112 can be of uniform thickness or of non-uniform thickness. The insulating layer 2114 is made of insulating material, and its thickness can be equal to or unequal to the thickness of the first active material layer 2112. Along the first direction Z, the size of the insulating layer 2114 can be greater than, less than, or equal to the size of the second insulating portion 2412. In a projection plane perpendicular to the second direction Y, the orthographic projection of the second insulating portion 2412 and the orthographic projection of the first active material layer 2112 can partially overlap or not overlap.

[0207] It is understandable that, along the second direction Y, if both sides of the first electrode 21 are provided with a solid electrolyte layer 23, then both sides of the first current collector 2113 are provided with a first active material layer 2112 and an insulating layer 2114.

[0208] As an example, along the second direction Y, a second electrode 22 is disposed on both sides of the first electrode 21, and a first active material layer 2112 and an insulating layer 2114 are disposed on both sides of the first current collector layer 2113. Along the first direction Z, the solid electrolyte layer 23 and the second electrode 22 both extend beyond the end of the first active material layer 2112 closest to the insulating layer 2114, with the second end 2111 being further away from the end of the first active material layer 2112 closest to the insulating layer 2114 than the first end 2211. Along the second direction Y, a second insulating portion 2412 is located between the insulating layer 2114 and the solid electrolyte layer 23. In a projection plane perpendicular to the second direction Y, the orthographic projection of the second insulating portion 2412 does not overlap with the orthographic projection of the first active material layer 2112, thus preventing the second insulating portion 2412 from obstructing the first active material layer 2112 and reducing the risk of the second insulating portion 2412 blocking the metal ions transported between the first electrode 21 and the second electrode 22.

[0209] In this embodiment, the insulating layer 2114 reduces the risk that burrs at the edge of the first current collector 2113 will pierce the solid electrolyte layer 23 and come into contact with the second electrode 22. The second insulating portion 2412 is stacked with the insulating layer 2114, and together with the insulating layer 2114, the second insulating portion 2412 can separate the first current collector 2113 and the second electrode 22, further reducing the risk that burrs at the edge of the first current collector 2113 will pierce the solid electrolyte layer 23 and come into contact with the second electrode 22.

[0210] In some embodiments, please refer to Figure 16 and Figure 18 Along the first direction Z, the size of the second insulating part 2412 is a, and the size of the first main body area 211 is A, 0.01≤a / A≤0.05.

[0211] a / A can take any one of the point values ​​or any range between two of the following: 0.01, 0.015, 0.02, 0.025, 0.03, 0.035, 0.04, 0.045, 0.05.

[0212] In this embodiment, a / A ≥ 0.01 ensures that the ratio of the dimension of the second insulating portion 2412 along the first direction Z to the dimension of the first main body region 211 along the first direction Z is not too small. This ensures that the second insulating portion 2412, which is sandwiched between the first main body region 211 and the solid electrolyte layer 23 in the first insulating member 241, has sufficient length, making the first insulating member 241 more secure on the first electrode 21. a / A ≤ 0.05 ensures that the ratio of the dimension of the second insulating portion 2412 along the first direction Z to the dimension of the first main body region 211 along the first direction Z is not too large. This reduces the material used in the second insulating portion 2412, resulting in better economy, and also reduces the risk that the active material layer (first active material layer 2112) in the first main body region 211 will be largely blocked by the second insulating portion 2412.

[0213] In some embodiments, 0.05mm ≤ a ≤ 5mm.

[0214] a can be any one of the following point values ​​or any range between two values: 0.05mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm.

[0215] In this embodiment, a ≥ 0.05 mm ensures that the second insulating portion 2412 has sufficient length to facilitate its arrangement on the surface of the first main body region 211. a ≤ 5 mm prevents the second insulating portion 2412 from becoming too long, reducing material usage and improving economy.

[0216] In some embodiments, along the second direction Y, the size of the second insulating portion 2412 is b, the size of the first main body region 211 is B, and 0.05≤b / B≤0.25.

[0217] The dimension of the second insulating portion 2412 along the second direction Y is the thickness of the second insulating portion 2412. The dimension of the first main body region 211 along the second direction Y is the thickness of the first main body region 211, B = M1.

[0218] b / B can take any one of the following point values ​​or a range between any two: 0.05, 0.07, 0.1, 0.12, 0.15, 0.17, 0.18, 0.2, 0.22, 0.25.

[0219] In this embodiment, b / B ≥ 0.05 ensures that the ratio of the dimension of the second insulating portion 2412 along the second direction Y to the dimension of the first main body region 211 along the second direction Y is not too small, thus ensuring that the second insulating portion 2412 has sufficient strength. b / B ≤ 0.25 ensures that the ratio of the dimension of the second insulating portion 2412 along the second direction Y to the dimension of the first main body region 211 along the second direction Y is not too large, reducing the thickness ratio of the second insulating portion 2412 in the first main body region 211, freeing up more space for the active material layer (first active material layer 2112) in the first main body region 211, which is beneficial to improving the volumetric energy density of the battery cell 10.

[0220] In some embodiments, 0.01mm ≤ b ≤ 0.1mm.

[0221] b can be any one of the following point values ​​or any range between two values: 0.01mm, 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm.

[0222] b ≥ 0.01 mm ensures that the second insulating part 2412 has sufficient thickness, thereby improving its strength. b ≤ 0.1 mm prevents the second insulating part 2412 from becoming too thick, reducing the material used and achieving better economic efficiency.

[0223] In some embodiments, please refer to Figure 19 , Figure 19 for Figure 6 A partial view of the top region of the electrode assembly 2 shown. The electrode assembly 2 includes a plurality of first electrode plates 21 arranged along a second direction Y, and a second electrode plate 22 disposed between two adjacent first electrode plates 21. The convergence portions 2122 of the plurality of first electrode plates 21 are connected to form a convergence area 25. The plurality of first electrode plates 21 include two adjacent third electrode plates 26. The second electrode plate 22 located between the two third electrode plates 26 is disposed opposite to the convergence area 25 along a first direction Z. The projection of the first insulating member 241 disposed on the two third electrode plates 26 along the first direction Z together covers the first end 2211 of the second electrode plate 22 located between the two third electrode plates 26.

[0224] The convergence portions 2122 of multiple first electrode plates 21 can be stacked together to form a convergence area 25. The convergence portions 2122 of multiple first electrode plates 21 can be connected by means of welding or bonding. The convergence area 25 is used to connect with other components, such as current collectors or electrode terminals 3. Along the second direction Y, the convergence area 25 can be located at the middle position of the electrode assembly 2 or it can be offset from the middle position of the electrode assembly 2, such that the convergence area 25 is close to one surface of the electrode assembly 2 along the second direction Y and away from the other surface of the electrode assembly 2 along the second direction Y.

[0225] Two of the multiple first electrode plates 21 are third electrode plates 26, and the two third electrode plates 26 are arranged adjacent to each other, meaning that no other first electrode plates 21 are arranged between the two third electrode plates 26. A second electrode plate 22 is arranged between the two third electrode plates 26, and this second electrode plate 22 is arranged opposite to the gathering area 25 along the first direction Z. It can be understood that the first electrode plates 21 located on both sides of the second electrode plate 22 arranged opposite to the gathering area 25 along the first direction Z and closest to the second electrode plate 22 are third electrode plates 26.

[0226] The first insulating member 241 disposed on the two third pole pieces 26 together separates the first end 2211 of the second pole piece 22 located between the two third pole pieces 26 and the connecting part 2121 of the first pole piece 212 of the two third pole pieces 26.

[0227] As an example, in Figure 19 In the illustrated embodiment, the electrode assembly 2 has a stacked structure. The number of second electrodes 22 is one more than the number of first electrodes 21, and a first electrode 21 is disposed between two adjacent second electrodes 22. Along the second direction Y, a convergence area 25 is located at the center of the electrode assembly 2. A second electrode 22 located at the center is disposed opposite to the convergence area 25 along the first direction Z.

[0228] In this embodiment, the projection of the first insulating member 241 disposed on the two third pole pieces 26 along the first direction Z together covers the first end 2211 of the second pole piece 22 located between the two third pole pieces 26, reducing the risk of the connection portion 2121 of the two third pole pieces 26 overlapping with the first end 2211 of the second pole piece 22 located between the two third pole pieces 26.

[0229] In some embodiments, please continue to refer to Figure 19 The plurality of first electrode plates 21 also include a fourth electrode plate 27, which is arranged along the second direction Y with the third electrode plate 26. The projection of the first insulating member 241 disposed on the fourth electrode plate 27 along the first direction Z covers the first end 2211 of the second electrode plate 22 adjacent to the fourth electrode plate 27 and located on the side of the fourth electrode plate 27 near the gathering area 25.

[0230] Among all the first electrode plates 21, one first electrode plate 21 can be the fourth electrode plate 27, that is, there is one fourth electrode plate 27, or multiple first electrode plates 21 can be the fourth electrode plates 27, that is, there are multiple fourth electrode plates 27. All first electrode plates 21 except for the third electrode plate 26 can be the fourth electrode plate 27.

[0231] like Figure 19 As shown, the second direction Y is parallel to the left and right directions. For the fourth electrode 27 located to the left of the third electrode 26, the projection of the first insulating member 241 disposed on the fourth electrode 27 along the first direction Z covers the right side of the fourth electrode 27 and the first end 2211 of the second electrode 22 closest to the fourth electrode 27. For the fourth electrode 27 located to the right of the third electrode 26, the projection of the first insulating member 241 disposed on the fourth electrode 27 along the first direction Z covers the left side of the fourth electrode 27 and the first end 2211 of the second electrode 22 closest to the fourth electrode 27.

[0232] Since the fourth electrode 27 and the third electrode 26 are arranged along the second direction Y, at least a portion of the connecting portion 2121 of the first electrode tab 212 of the fourth electrode 27 will extend obliquely towards the third electrode 26. This makes it easier for the connecting portion 2121 of the first electrode tab 212 of the fourth electrode 27 to overlap with the first end 2211 of the adjacent second electrode 22 located on the side of the fourth electrode 27 near the gathering area 25. Furthermore, since the projection of the first insulating member 241 disposed on the fourth electrode 27 along the first direction Z covers the first end 2211 of the second electrode 22 adjacent to the fourth electrode 27 and located on the side of the fourth electrode 27 near the gathering area 25, the risk of the connecting portion 2121 of the first electrode tab 212 of the fourth electrode 27 overlapping with the first end 2211 of the adjacent second electrode 22 located on the side of the fourth electrode 27 near the gathering area 25 is effectively reduced.

[0233] In some embodiments, please continue to refer to Figure 19 Along the second direction Y, two solid electrolyte layers 23 are respectively disposed on the two opposite surfaces of the second electrode 22. In the projection plane perpendicular to the first direction Z, the orthographic projection of the two solid electrolyte layers 23 disposed on the two opposite surfaces of the second electrode 22 overlaps with the orthographic projection of the first insulating member 241 disposed on the fourth electrode 27.

[0234] Along the second direction Y, two solid electrolyte layers 23 are respectively provided on the two opposite surfaces of the second electrode 22, that is, both opposite surfaces of the second electrode 22 are provided with solid electrolyte layers 23.

[0235] The projection of the first insulating member 241 disposed on the fourth electrode 27 along the first direction Z covers both the first end 2211 of the second electrode 22 adjacent to the fourth electrode 27 and located on the side of the fourth electrode 27 near the gathering area 25, and the two solid electrolyte layers 23 located on the two opposite surfaces of the second electrode 22.

[0236] As an example, in the projection plane perpendicular to the first direction Z, the orthographic projection of the first insulating member 241 disposed on the fourth electrode 27 along the second direction Y is greater than the sum of the orthographic projection of the second electrode 22 along the second direction Y and the orthographic projection of the two solid electrolyte layers 23 along the second direction Y.

[0237] In this embodiment, in the projection plane perpendicular to the first direction Z, the orthographic projection of the two solid electrolyte layers 23 overlaps with the orthographic projection of the first insulating member 241 disposed on the fourth electrode 27. This allows the projection of the first insulating member 241 disposed on the fourth electrode 27 in the first direction Z to cover both the second electrode 22 and the solid electrolyte layers 23 on both sides of the second electrode 22, reducing the risk of the connection portion 2121 of the first electrode tab 212 of the fourth electrode 27 overlapping with the adjacent second electrode 22.

[0238] In some embodiments, please refer to Figure 20 , Figure 20 This is a schematic diagram showing the connection between the first electrode 21 and the first insulating member 241 provided in some embodiments of this application. Along the third direction X, the first insulating member 241 extends beyond at least one edge of the first electrode tab 212, and the first direction Z, the second direction Y, and the third direction X are not coplanar and intersect each other.

[0239] Along a third direction X, the first tab 212 has two opposing edges, namely a first edge 2123 and a second edge 2124, and the first insulating member 241 may extend beyond the first edge 2123 and / or the second edge 2124. The first edge 2123 and the second edge 2124 may be arranged parallel to each other, or at an acute or obtuse angle. Figure 20 In the illustrated embodiment, the first edge 2123 and the second edge 2124 are set at an acute angle.

[0240] As an example, the first direction Z, the second direction Y, and the third direction X are all perpendicular to each other.

[0241] In this embodiment, along the third direction X, the first insulating member 241 extends beyond at least one edge of the first electrode tab 212, increasing the size of the first insulating member 241 in the third direction X and reducing the risk of the connection portion 2121 overlapping with the second electrode 22.

[0242] In some embodiments, please continue to refer to Figure 20Along the third direction X, the first insulating member 241 extends beyond the two opposite edges of the first tab 212.

[0243] Along the third direction X, the first insulating member 241 has two overhanging portions. The portion of the first insulating member 241 that extends beyond the first edge 2123 of the first tab 212 is one overhanging portion, and the portion of the first insulating member 241 that extends beyond the second edge 2124 of the first tab 212 is the other overhanging portion.

[0244] In this embodiment, along the third direction X, the first insulating member 241 extends beyond the two opposite edges of the first electrode tab 212, further increasing the size of the first insulating member 241 in the third direction X. The first insulating member 241 can cover more area of ​​the surface of the connecting part 2121 along the third direction X, reducing the risk of the connecting part 2121 overlapping with the second electrode 22.

[0245] In some embodiments, please continue to refer to Figure 20 Along the third direction X, the size of the first insulating member 241 is larger than the size of the first tab 212.

[0246] Along the third direction X, the size of the first tab 212 is D1, where D1 is the maximum distance between the first edge 2123 and the second edge 2124 along the third direction X; along the third direction X, the size of the first insulating member 241 is D2, where D2 is the maximum distance between the two opposite ends of the first insulating member 241 along the third direction X, and D2 > D1.

[0247] In this embodiment, D2 > D1, which makes the first insulating member 241 have a certain redundancy in the third direction X, which is beneficial for the first insulating member 241 to cover more areas of the surface of the connecting part 2121 after being disposed on the connecting part 2121.

[0248] In some embodiments, please refer to Figure 21 , Figure 21 This is a partial view of the electrode assembly 2 provided in other embodiments of this application. The insulating member 24 includes a second insulating member 242, and the first insulating member 241 and the second insulating member 242 are respectively disposed on both sides of the first electrode tab 212 in the thickness direction.

[0249] The second insulating member 242 and the first insulating member 241 can be made of the same material or different materials. The second insulating member 242 can be an insulating tape or insulating coating disposed on the first electrode 21.

[0250] The second insulating member 242 can be entirely disposed on the first tab 212. For example, the entire second insulating member 242 can be disposed on the first connecting portion 21211; or, a portion of the second insulating member 242 can be disposed on the first connecting portion 21211, and another portion of the second insulating member 242 can be disposed on the second connecting portion 21212. Alternatively, a portion of the second insulating member 242 can be disposed on the first tab 212, and another portion of the second insulating member 242 can be disposed on the first main body region 211, and stacked with the first main body region 211. For example... Figure 21 As shown, a portion of the second insulating member 242 is stacked with the thinned portion 21122 of the first active material layer 2112.

[0251] In this embodiment, the provision of the second insulating member 242 allows more of the surface of the first electrode tab 212 to be covered, further reducing the risk of the first electrode tab 212 overlapping with the second electrode plate 22.

[0252] Furthermore, taking the first insulating component 241 and the second insulating component 242 as examples where both are insulating tapes, after the first electrode 21 is formed, two insulating tapes can be respectively placed on both sides of the first electrode tab 212 in the thickness direction to cover the two surfaces of the first electrode tab 212 in the thickness direction. After the first electrode 21, the second electrode 22 and the solid electrolyte layer 23 are formed into the electrode assembly 2, if the first electrode tab 212 is bent in one direction, an insulating tape can separate the first electrode tab 212 and the second electrode 22. If the first electrode 21 is bent in the opposite direction, another insulating tape can separate the first electrode tab 212 and the second electrode 22.

[0253] In some embodiments, along a third direction X, the first insulating member 241 and the second insulating member 242 both extend beyond at least one edge of the first tab 212, and the first direction Z, the second direction Y, and the third direction X are not coplanar and intersect each other. The portions of the first insulating member 241 and the second insulating member 242 extending beyond the same edge of the first tab 212 along the third direction X are connected to each other.

[0254] The portions of the first insulating member 241 and the second insulating member 242 extending beyond the same edge of the first tab 212 along the third direction X can be bonded, heat-fused, or otherwise connected.

[0255] As an example, along a third direction X, both the first insulating member 241 and the second insulating member 242 extend beyond the two opposite edges of the first tab 212, the two edges being the first edge 2123 (…). Figure 20 (shown in) and the second edge 2124 ( Figure 20 (As shown in the figure). The portions of the first insulating member 241 and the second insulating member 242 extending beyond the first edge 2123 along the third direction X are connected to each other, and the portions of the first insulating member 241 and the second insulating member 242 extending beyond the second edge 2124 along the third direction X are connected to each other.

[0256] The portions of the first insulating member 241 and the second insulating member 242 extending beyond the same edge of the first electrode tab 212 along a third direction X are connected to each other. This enhances the stability of the first insulating member 241 on the first electrode tab 212 and reduces the risk of the first insulating member 241 detaching from the first electrode tab 212. Furthermore, the first insulating member 241 and the second insulating member 242 are entirely enclosing the first electrode tab 212, further reducing the risk of the connection portion 2121 of the first electrode tab 212 overlapping with the second electrode plate 22.

[0257] In some embodiments, the first insulating member 241 is an insulating tape disposed on the first electrode 21.

[0258] Insulating tape is attached to the surface of the first electrode 21. For example, part of the insulating tape is attached to the surface of the connecting part 2121 of the first electrode tab 212, and another part is attached to the surface of the first main body area 211.

[0259] As an example, the material of the first insulating element 241 may include PP (Polypropylene), PET (Polyethylene Terephthalate), etc.

[0260] In this embodiment, the first insulating member 241 is an insulating tape disposed on the first electrode 21. This type of first insulating member 241 has low manufacturing cost and is easy to connect to the first electrode 21.

[0261] In some embodiments, the first insulating element 241 is an insulating coating disposed on the first electrode 21.

[0262] As an example, the insulating coating can be an inorganic non-metallic coating such as aluminum oxide or calcium oxide.

[0263] In this embodiment, the first insulating element 241 is an insulating coating disposed on the first electrode 21. This structure of the first insulating element 241 has a high connection strength with the first electrode 21, and the first insulating element 241 is not easy to detach from the first electrode 21.

[0264] In some embodiments, please refer to Figure 22 and Figure 23 , Figure 22 This is a schematic diagram of the structure of electrode assembly 2 provided in other embodiments of this application; Figure 23 for Figure 22 A partial enlarged view at point C. The insulating member 24 includes a third insulating member 243, which is disposed on the second electrode 22 along the first direction Z. At least a portion of the third insulating member 243 is disposed between the connecting portion 2121 and the first end 2211.

[0265] The third insulating element 243 is made of insulating material. The third insulating element 243 can be part of the insulating element 24, or the third insulating element 243 can be the same as the insulating element 24. In embodiments where the insulating element 24 also includes the first insulating element 241, both the first insulating element 241 and the third insulating element 243 are part of the insulating element 24. The first insulating element 241 and the third insulating element 243 can be independent of each other and set separately, or they can be connected to each other.

[0266] In an embodiment where the electrode assembly 2 includes multiple second electrode pieces 22 arranged along the second direction Y, the multiple second electrode pieces 22 can share a third insulating member 243, or each second electrode piece 22 can be provided with a corresponding third insulating member 243. As an example, in... Figure 22 and Figure 23 In the illustrated embodiment, each second electrode 22 is provided with a corresponding third insulating element 243.

[0267] Along the first direction Z, the third insulating member 243 may be partially disposed between the connecting part 2121 and the first end 2211, or it may be disposed entirely between the connecting part 2121 and the first end 2211.

[0268] The third insulating element 243 can be connected to the second electrode 22, for example, the third insulating element 243 can be bonded to the second electrode 22. The third insulating element 243 can also only be in contact with the second electrode 22, for example, the third insulating element 243 can be placed at the first end 2211.

[0269] The third insulating element 243 may cover a portion of the first end 2211 or cover the entire first end 2211.

[0270] In this embodiment, by disposing the third insulating member 243 on the second electrode 22 and at least partially between the connecting portion 2121 and the first end 2211, the risk of overlap between the connecting portion 2121 and the second electrode 22 can be reduced, and stable insulation between the connecting portion 2121 and the second electrode 22 can be achieved. Furthermore, the third insulating member 243 is less likely to affect the bending of the first electrode tab 212.

[0271] In some embodiments, the third insulating element 243 completely covers the first end 2211.

[0272] The end face of the second electrode 22 located at the first end 2211 is the first end face, and the third insulating member 243 completely covers the first end 2211, that is, the third insulating member 243 covers the entire first end face.

[0273] In this embodiment, the third insulating member 243 completely covers the first end 2211, increasing the area covered by the third insulating member 243 at the first end 2211 and reducing the risk of the connecting part 2121 overlapping with the second electrode 22.

[0274] In some embodiments, please continue to refer to Figure 22 and Figure 23 Along the second direction Y, two solid electrolyte layers 23 are respectively disposed on the two opposite surfaces of the second electrode 22. In the projection plane perpendicular to the first direction Z, the orthographic projection of the two solid electrolyte layers 23 disposed on the two opposite surfaces of the second electrode 22 partially overlaps with the orthographic projection of the third insulating member 243.

[0275] As an example, along the first direction Z, the solid electrolyte layer 23 has a second end face facing the connection portion 2121, the second end face being flush with the first end face, and the third insulating member 243 covering part or all of the second end face of the solid electrolyte layer 23.

[0276] In this embodiment, in the projection plane perpendicular to the first direction Z, the orthographic projections of the two solid electrolyte layers 23 partially overlap with the orthographic projection of the third insulating member 243, increasing the coverage area of ​​the third insulating member 243 and reducing the risk of the connection portion 2121 overlapping with the second electrode 22.

[0277] In some embodiments, the third insulating element 243 is an insulating coating disposed on the first end 2211.

[0278] As an example, the insulating coating can be an inorganic non-metallic coating such as aluminum oxide or calcium oxide.

[0279] As an example, in Figure 22 and Figure 23 In the illustrated embodiment, the electrode assembly 2 includes a plurality of second electrodes 22, which are arranged along a second direction Y. A third insulating member 243 is correspondingly disposed at the first end 2211 of each second electrode 22. Along the second direction Y, the size of the third insulating member 243 is equal to the sum of the sizes of the second electrodes 22 and the two solid electrolyte layers 23.

[0280] In this embodiment, the third insulating element 243 is an insulating coating disposed on the first end 2211. The connection strength between the third insulating element 243 and the second electrode 22 is high, and the third insulating element 243 is not easy to detach from the second electrode 22.

[0281] In some embodiments, please refer to Figure 24 and Figure 25 , Figure 24 This is a schematic diagram of the structure of electrode assembly 2 provided in some embodiments of this application; Figure 25 for Figure 24A partial enlarged view at point D. The electrode assembly 2 includes a plurality of second electrode plates 22 arranged along the second direction Y. A first electrode plate 21 is disposed between two adjacent second electrode plates 22. A third insulating member 243 covers the first ends 2211 of the plurality of second electrode plates 22. The third insulating member 243 is provided with a hollow area 2431. The connecting part 2121 of each first electrode tab 212 passes through the corresponding hollow area 2431.

[0282] As an example, electrode assembly 2 has a stacked structure.

[0283] The third insulating element 243 can be an insulating coating disposed on the first ends 2211 of the plurality of second electrode plates 22, an insulating tape disposed on the first ends 2211 of the plurality of second electrode plates 22, or an insulating bracket disposed on the first ends 2211 of the plurality of second electrode plates 22. The insulating bracket can be made of rubber, plastic, or other materials. The insulating bracket can be connected to or placed on the first ends 2211 of the plurality of first electrode plates 21.

[0284] The cutout area 2431 can be a through hole or notch provided on the third insulating member 243, wherein the notch can penetrate the third insulating member 243 along the first direction Z and extend to one edge of the third insulating member 243 along the third direction X.

[0285] The hollow area 2431 of the third insulating member 243 allows the first electrode tab 212 to pass through, facilitating the connection of the first electrode tab 212 with other components. One third insulating member 243 can achieve insulation isolation between multiple second electrode plates 22 and the corresponding first electrode tab 212, effectively improving the arrangement efficiency of the third insulating member 243.

[0286] In some embodiments, please refer to Figure 26 and Figure 27 , Figure 26 for Figure 25 A cross-sectional view of the third insulating member 243 shown; Figure 27 for Figure 26 The third insulating member 243 is shown in view E. The cutout area 2431 includes a through hole extending through the third insulating member 243 along the first direction Z.

[0287] Through holes can come in various shapes, such as circular holes and polygonal holes. Polygonal holes can be triangular, quadrilateral, pentagonal, etc. As an example, in Figure 26 and Figure 27 In the illustrated embodiment, the through hole is a rectangular hole.

[0288] By providing through holes on the third insulating member 243, the first electrode tab 212 can be easily passed through, and a large area of ​​the first end 2211 can be covered.

[0289] In some embodiments, please refer to Figure 28 and Figure 29 , Figure 28 This is a schematic diagram of the structure of electrode assembly 2 provided in some embodiments of this application; Figure 29 for Figure 28 A partial enlarged view at point F. The insulating member 24 includes a first insulating member 241 and a third insulating member 243. Along the first direction Z, at least a portion of the first insulating member 241 is disposed between the connecting portion 2121 and the first end 2211, and at least a portion of the third insulating member 243 is disposed between the connecting portion 2121 and the first end 2211. The first insulating member 241 is disposed on the first tab 212. The third insulating member 243 is disposed on the first end 2211 of the second electrode 22.

[0290] The structure of the first insulating member 241 can be found in the first insulating member 241 in the foregoing embodiments, and the structure of the third insulating member 243 can be found in the third insulating member 243 in the foregoing embodiments, and will not be described again here.

[0291] In this embodiment, both the first insulating member 241 and the third insulating member 243 can serve to insulate and isolate the connecting part 2121 and the second electrode 22, thereby achieving multi-layer isolation between the connecting part 2121 and the second electrode 22 and further reducing the risk of short circuit between the first electrode 21 and the second electrode 22 caused by the connecting part 2121 overlapping with the first end 2211.

[0292] In some embodiments, please refer to Figure 23 , Figure 25 and Figure 29 Along the first direction Z, the first main body region 211 has a second end 2111, the first tab 212 is connected to the second end 2111, and the second electrode 22 includes a second overhang region 2214 that extends beyond the second end 2111. The end of the second overhang region 2214 facing the connecting portion 2121 is the first end 2211. In the projection plane perpendicular to the second direction Y, the orthographic projection of the second overhang region 2214 overlaps with the orthographic projection of the solid electrolyte layer 23.

[0293] The second extension region 2214 is the portion of the second main body region 221 of the second electrode 22 that extends beyond the second end 2111. The solid electrolyte layer 23 has a first extension region 231 that extends beyond the second end 2111. Figure 23 , Figure 25 and Figure 29In an embodiment (not shown), the second overlay region 2214 and the first overlay region 231 are stacked along the second direction Y. Additionally, in an embodiment where the portion of the first insulating member 241 located along the second direction Y between the first overlay region 231 and the connecting portion 2121 abuts against the first overlay region 231 and the connecting portion 2121, the first insulating member 241 can reduce the risk of the solid electrolyte layer 23 and the second electrode 22 being cracked or sheared by the edge of the first main body region 211 located at the second end 2111 during the forming process of the electrode assembly 2.

[0294] As an example, along the first direction Z, the solid electrolyte layer 23 has a second end face facing the connection portion 2121. The second end face is flush with the first end face. In a projection plane perpendicular to the second direction Y, the orthographic projection of the second overhang region 2214 can overlap with the orthographic projection of the first overhang region 231.

[0295] In this embodiment, in the projection plane perpendicular to the second direction Y, the orthographic projection of the second overhang region 2214 partially overlaps with the orthographic projection of the solid electrolyte layer 23. This increases the size of the solid electrolyte layer 23 along the first direction Z, resulting in a better separation effect between the solid electrolyte layer 23 and the first electrode 21 and the second electrode 22.

[0296] Since the second extension region 2214 of the second electrode 22 extends beyond the second end 2111 of the first main body region 211, the risk of contact between the first end 2211 of the second extension region 2214 and the connection portion 2121 of the first electrode tab 212 is greater. However, by providing an insulating member 24 between the first end 2211 and the connection portion 2121 of the first electrode tab 212, the risk of contact between the connection portion 2121 and the first end 2211 can be effectively reduced.

[0297] In some embodiments, the electrode assembly 2 is a stacked structure, and the electrode assembly 2 includes a plurality of first electrode sheets 21 and a plurality of second electrode sheets 22, which are stacked along the second direction Y.

[0298] As an example, along the second direction Y, the first electrode 21 and the second electrode 22 are arranged alternately, and a solid electrolyte layer 23 is provided between adjacent first electrode 21 and second electrode 22. The number of second electrode 22 is one more than the number of first electrode 21. The second electrode 22 is the negative electrode, the second electrode tab 222 is the negative electrode tab, the first electrode 21 is the positive electrode, and the first electrode tab 212 is the positive electrode tab.

[0299] In this embodiment, electrode assembly 2 is a stacked electrode assembly, which can achieve higher volumetric energy density and has better thermal stability.

[0300] This application provides a battery device 100, which includes a battery cell 10 provided in any of the above embodiments.

[0301] This application provides an electrical device, including a battery cell 10 or a battery device 100 provided in any of the above embodiments, wherein the battery cell 10 is used to provide electrical energy.

[0302] In addition, please refer to Figures 3-10 This application provides a battery cell 10, which is a prismatic battery cell. The battery cell 10 includes a housing 1 and an electrode assembly 2, which is housed within the housing 1. The electrode assembly 2 is a stacked electrode assembly, which includes a first electrode 21, a second electrode 22, a solid electrolyte layer 23, and a first insulating member 241. The first electrode 21 includes a first main body region 211 and a first tab 212. Along the first direction Z, the first main body region 211 has a second end 2111, and the first tab 212 is disposed at the second end 2111. The second electrode 22 has the opposite polarity to the first electrode 21. Along the first direction Z, the end of the second electrode 22 closest to the first tab 212 is the first end 2211. The first tab 212 includes a gathering portion 2122 and a connecting portion 2121 connected in sequence. Multiple gathering portions 2122 are connected to form a gathering area 25, and the connecting portion 2121 connects the gathering portion 2122 and the first main body region 211. A solid electrolyte layer 23 is disposed between the first electrode 21 and the second electrode 22 along a second direction Y, which is perpendicular to the first direction Z. A first insulating member 241 is disposed at least partially along the first direction Z between the connecting portion 2121 and the first end 2211 to insulate and isolate the connecting portion 2121 and the second electrode 22.

[0303] The first insulating member 241 is disposed at the connecting portion 2121 of the first electrode tab 212. The connecting portion 2121 is bent to form a first connecting portion 21211 and a second connecting portion 21212 that are connected to each other. The first connecting portion 21211 is connected to the retracting portion 2122, and the second connecting portion 21212 is connected to the first main body area 211. Along the first direction Z, the first connecting portion 21211 is disposed opposite to the first end 2211, and the first connecting portion 21211 has a first surface 21211a facing the first end 2211. Along the second direction Y, the second connecting portion 21212 has a second surface 21212a facing the second electrode 22, and the second surface 21212a is connected to the first surface 21211a. A portion of the first insulating member 241 is located between the first connecting portion 21211 and the first end 2211, and covers at least a portion of the first surface 21211a, and the first insulating member 241 also covers at least a portion of the second surface 21212a. The first insulating member 241 is connected to the second end 2111 and extends along the extension direction of the first electrode tab 212. The first insulating member 241 is an insulating tape or insulating coating disposed on the first electrode plate 21.

[0304] In such a battery cell 10, by providing a first insulating member 241 on the connection portion 2121 of the first tab 212 and disposing at least a portion of the first insulating member 241 between the connection portion 2121 and the first end 2211, the first insulating member 241 can insulate and isolate the connection portion 2121 and the second electrode 22, thereby reducing the risk of a short circuit between the first electrode 21 and the second electrode 22 caused by the connection portion 2121 overlapping with the first end 2211, and effectively improving the reliability of the battery cell 10.

[0305] Please refer to Figure 22 and Figure 23 This application provides a battery cell 10, which is a prismatic battery cell 10. The battery cell 10 includes a housing 1 and an electrode assembly 2, which is housed within the housing 1. The electrode assembly 2 is a stacked electrode assembly, which includes a first electrode 21, a second electrode 22, a solid electrolyte layer 23, and a third insulating member 243. The first electrode 21 includes a first main body region 211 and a first tab 212. Along the first direction Z, the first main body region 211 has a second end 2111, and the first tab 212 is disposed at the second end 2111. The second electrode 22 has the opposite polarity to the first electrode 21. Along the first direction Z, the end of the second electrode 22 closest to the first tab 212 is the first end 2211. The first tab 212 includes a gathering portion 2122 and a connecting portion 2121 connected in sequence. Multiple gathering portions 2122 are connected to form a gathering area 25, and the connecting portion 2121 connects the gathering portion 2122 and the first main body region 211. A solid electrolyte layer 23 is disposed between the first electrode 21 and the second electrode 22 along a second direction Y, which is perpendicular to the first direction Z. A third insulating member 243 is disposed at least partially along the first direction Z between the connecting portion 2121 and the first end 2211 to insulate and isolate the connecting portion 2121 and the second electrode 22.

[0306] The third insulating element 243 is disposed on the second electrode 22 and completely covers the first end 2211. Along the second direction Y, two solid electrolyte layers 23 are respectively disposed on the two opposite surfaces of the second electrode 22. In a projection plane perpendicular to the first direction Z, the orthographic projections of the two solid electrolyte layers 23 partially overlap with the orthographic projection of the third insulating element 243. The electrode assembly 2 includes a plurality of second electrode 22 arranged along the second direction Y, with a first electrode 21 disposed between two adjacent second electrode 22, and each second electrode 22 corresponding to one third insulating element 243. The third insulating element 243 is an insulating coating disposed on the first end 2211.

[0307] In such a battery cell 10, by providing a third insulating member 243 on the second electrode 22 and covering the first end 2211 with the third insulating member 243, the third insulating member 243 can insulate and isolate the connecting part 2121 and the second electrode 22, reducing the risk of short circuit between the first electrode 21 and the second electrode 22 caused by the connecting part 2121 overlapping with the first end 2211, and effectively improving the reliability of the battery cell 10.

[0308] Please refer to Figure 24 and Figure 25 This application provides a battery cell 10, which is a prismatic battery cell 10. The battery cell 10 includes a housing 1 and an electrode assembly 2, which is housed within the housing 1. The electrode assembly 2 is a stacked electrode assembly, which includes a first electrode 21, a second electrode 22, a solid electrolyte layer 23, and a third insulating member 243. The first electrode 21 includes a first main body region 211 and a first tab 212. Along the first direction Z, the first main body region 211 has a second end 2111, and the first tab 212 is disposed at the second end 2111. The second electrode 22 has the opposite polarity to the first electrode 21. Along the first direction Z, the end of the second electrode 22 closest to the first tab 212 is the first end 2211. The first tab 212 includes a gathering portion 2122 and a connecting portion 2121 connected in sequence. Multiple gathering portions 2122 are connected to form a gathering area 25, and the connecting portion 2121 connects the gathering portion 2122 and the first main body region 211. A solid electrolyte layer 23 is disposed between the first electrode 21 and the second electrode 22 along a second direction Y, which is perpendicular to the first direction Z. A third insulating member 243 is disposed at least partially along the first direction Z between the connecting portion 2121 and the first end 2211 to insulate and isolate the connecting portion 2121 and the second electrode 22.

[0309] The third insulating member 243 is disposed on the second electrode 22 and completely covers the first end 2211. Along the second direction Y, two solid electrolyte layers 23 are respectively disposed on the two opposite surfaces of the second electrode 22. In a projection plane perpendicular to the first direction Z, the orthographic projections of the two solid electrolyte layers 23 partially overlap with the orthographic projection of the third insulating member 243. The electrode assembly 2 includes a plurality of second electrode 22 arranged along the second direction Y, with a first electrode 21 disposed between two adjacent second electrode 22. The third insulating member 243 covers the first end 2211 of the plurality of second electrode 22. The third insulating member 243 is an insulating support, and has a through hole extending through the third insulating member 243 along the first direction Z. The connecting portion 2121 of the first electrode tab 212 passes through the corresponding through hole.

[0310] In such a battery cell 10, by setting a third insulating member 243 on the second electrode 22, and by covering the first end 2211 of multiple second electrode 22s, the third insulating member 243 achieves insulation isolation between multiple second electrode 22s and the corresponding first electrode tab 212, reducing the risk of short circuit between the first electrode 21 and the second electrode 22, and effectively improving the reliability of the battery cell 10.

[0311] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0312] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, The application relates to a battery, comprising: a housing; an electrode assembly accommodated in the housing, the electrode assembly comprising: a first tab comprising a first body region and a first lug, the first lug being arranged at one end of the first body region along a first direction, the first lug comprising a folding portion and a connecting portion connected in sequence, the folding portion being used for connecting with the folding portion of an adjacent first lug, and the connecting portion connecting the folding portion and the first body region; a second tab opposite to the first tab in polarity, the second tab being close to the first lug at a first end along the first direction; a solid-state electrolyte layer arranged between the first tab and the second tab along a second direction intersecting the first direction; an insulating member arranged at least partially between the connecting portion and the first end along the first direction to insulate and separate the connecting portion and the second tab.

2. The battery cell of claim 1, wherein, The insulating member comprises a first insulating member arranged at the connecting portion, at least a part of the first insulating member being located between the connecting portion and the first end along the first direction.

3. The battery cell of claim 2, wherein, The connecting portion is bent to form a first connecting portion and a second connecting portion connected with each other, the first connecting portion is connected with the folding portion, the second connecting portion is connected with the first body region, the first connecting portion is arranged opposite to the first end along the first direction, the first connecting portion has a first surface facing the first end, at least a part of the first insulating member is located between the first connecting portion and the first end and covers at least a part of the first surface.

4. The battery cell of claim 3, wherein, Along the second direction, the second connecting portion has a second surface facing the second tab, the second surface is connected with the first surface, and the first insulating member covers at least a part of the second surface.

5. The battery cell of claim 2, wherein, Along the first direction, the first body region has a second end, the first lug is connected to the second end, and the solid-state electrolyte layer comprises a first overhanging region beyond the second end; Along the second direction, a part of the first insulating member is located between the first overhanging region and the connecting portion.

6. The battery cell of claim 5, wherein, Along the second direction, the part of the first insulating member located between the first overhanging region and the connecting portion abuts against the first overhanging region and the connecting portion.

7. The battery cell of claim 2, wherein the cathode comprises a lithium metal oxide. Along the first direction, the first body region has a second end, and the first lug is connected to the second end; The first insulating member comprises a first insulating portion, the first insulating portion is connected to the second end and extends along the extension direction of the first lug, and at least a part of the first insulating portion is located between the connecting portion and the first end along the first direction.

8. The battery cell of claim 7, wherein the cathode comprises a lithium metal oxide. Along the second direction, the first tab and the second tab are arranged alternately, the second tab is one more than the first tab, the length of the first insulating portion is H along the extension direction of the first lug, and Q<=H<=2Q; N is an even number, Q=M1*N / 2+M2*(N-1) / 2+M3*(N-1); or N is an odd number, Q=M1*(N-1) / 2+M2*(N-1) / 2+M3*(N-1). The number of the first tabs in the electrode assembly is N; the thickness of the first tab is M1, the thickness of the second tab is M2, and the thickness of the solid-state electrolyte layer is M3.

9. The battery cell as described in claim 7, characterized in that, The solid-state electrolyte layer includes a first overhanging region beyond the second end; In the second direction, a portion of the first insulating part is located between the first overhanging region and the connecting part and abuts against the first overhanging region and the connecting part.

10. The battery cell of claim 9, wherein, The first insulating part includes: A first part is arranged at the connecting part, and at least a portion of the first part is located between the connecting part and the first end in the first direction; A second part is connected to the first part, and the second part is connected to the second end. The thickness of the second part is greater than the thickness of the first part. In the second direction, at least a portion of the second part is located between the first overhanging region and the connecting part and abuts against the first overhanging region and the connecting part.

11. The battery cell of claim 10, wherein the cathode comprises a lithium metal oxide. In the first direction, the size of the second part is d, and the size of the first overhanging region is D, and 0.1≤d / D≤1.

12. The battery cell of claim 11, wherein, 2mm≤d≤10mm.

13. The battery cell as described in claim 10, characterized in that, The first insulating part further includes a second insulating part connected to the second part. The thickness of the second insulating part is less than the thickness of the second part. In the second direction, the second insulating part is arranged in a stack with the first main region.

14. The battery cell as described in claim 7, characterized in that, The first insulating part further includes a second insulating part connected to the first insulating part. In the second direction, the second insulating part is arranged in a stack with the first main region.

15. The battery cell as described in claim 14, characterized in that, The first main region includes: A first current collector layer connected to the first tab; A first active material layer located at an end of the first tab close to the second end in the first direction; in the second direction, a side of the first current collector layer facing the solid-state electrolyte layer is provided with the first active material layer, and the second insulating part is arranged in a stack with the first active material layer.

16. The battery cell of claim 15, wherein, The first active material layer includes: A main part; A thinned part arranged at an end of the main part close to the first tab in the first direction. The thickness of the thinned part is less than the thickness of the main part. In the second direction, the second insulating part is arranged in a stack with the thinned part.

17. The battery cell as described in claim 14, characterized in that, The first main region includes: A first current collector layer connected to the first tab; A first active material layer and an insulating layer arranged at an end of the first active material layer close to the first tab in the first direction. The end of the insulating layer close to the first tab in the first direction is located at the second end. In the second direction, a side of the first current collector layer facing the solid-state electrolyte layer is provided with the first active material layer and the insulating layer, and the second insulating part is arranged in a stack with the insulating layer.

18. The battery cell as described in claim 13, characterized in that, In the first direction, the size of the second insulating part is a, and the size of the first main region is A, and 0.01≤a / A≤0.

05.

19. The battery cell of claim 18, wherein the cathode comprises a lithium metal oxide. 0.05mm≤a≤5mm.

20. The battery cell of claim 13, wherein, In the second direction, the size of the second insulating part is b, and the size of the first main region is B, and 0.05≤b / B≤0.

25.

21. The battery cell as described in claim 20, characterized in that, 0.01mm≤b≤0.1mm.

22. The battery cell as described in claim 2, characterized in that, The electrode assembly comprises a plurality of the first pole pieces arranged along the second direction, and the second pole piece is arranged between two adjacent first pole pieces; The gathering portions of the plurality of first pole pieces are connected to form a gathering area, the plurality of first pole pieces comprises two adjacent third pole pieces, the second pole piece between the two third pole pieces is arranged opposite to the gathering area along the first direction, and the projection of the first insulating member arranged on the two third pole pieces along the first direction collectively covers the first end of the second pole piece between the two third pole pieces.

23. The battery cell as described in claim 22, characterized in that, The plurality of first pole pieces further comprises a fourth pole piece, and the fourth pole piece is arranged along the second direction with the third pole piece; The projection of the first insulating member arranged on the fourth pole piece along the first direction covers the first end of the second pole piece adjacent to the fourth pole piece and located on the side of the fourth pole piece close to the gathering area.

24. The battery cell as described in claim 23, characterized in that, Along the second direction, the opposite surfaces of the second pole piece are respectively provided with two solid-state electrolyte layers; In the projection plane perpendicular to the first direction, the projection of the two solid-state electrolyte layers partially overlaps the projection of the first insulating member arranged on the fourth pole piece.

25. The battery cell as described in claim 2, characterized in that, Along the third direction, the first insulating member exceeds at least one edge of the first tab, and the first direction, the second direction and the third direction are not coplanar and intersect with each other.

26. The battery cell as described in claim 25, characterized in that, Along the third direction, the first insulating member exceeds the opposite two edges of the first tab.

27. The battery cell as described in claim 25, characterized in that, Along the third direction, the size of the first insulating member is greater than the size of the first tab.

28. The battery cell as described in claim 2, characterized in that, The insulating member comprises a second insulating member, and the first insulating member and the second insulating member are arranged on both sides of the first tab in the thickness direction.

29. The battery cell as described in claim 28, characterized in that, Along the third direction, the first insulating member and the second insulating member both exceed at least one edge of the first tab, and the first direction, the second direction and the third direction are not coplanar and intersect with each other; Wherein, the part of the first insulating member and the second insulating member exceeding the same edge of the first tab along the third direction is connected to each other.

30. The battery cell of claim 2, wherein, The first insulating member is an insulating tape arranged on the first pole piece.

31. The battery cell as described in claim 2, characterized in that, The first insulating member is an insulating coating arranged on the first pole piece.

32. The battery cell of any one of claims 1-31, wherein, The insulating member comprises a third insulating member, and the third insulating member is arranged on the second pole piece, and at least part of the third insulating member is arranged between the connecting portion and the first end along the first direction.

33. The battery cell as described in claim 32, characterized in that, The third insulating member completely covers the first end.

34. The battery cell as described in claim 32, characterized in that, Along the second direction, the opposite surfaces of the second pole piece are respectively provided with two solid-state electrolyte layers; In the projection plane perpendicular to the first direction, the projection of the two solid-state electrolyte layers partially overlaps the projection of the third insulating member.

35. The battery cell as described in claim 32, characterized in that, The third insulating member is an insulating coating arranged on the first end.

36. The battery cell as described in claim 32, characterized in that, The electrode assembly includes a plurality of the second tabs arranged along the second direction, and the first tab is arranged between two adjacent second tabs, the third insulating member covers the first end of the plurality of second tabs, and the third insulating member is provided with a hollow region, and the connecting portion of each first tab is arranged in the corresponding hollow region.

37. The battery cell of claim 36, wherein the cathode comprises a lithium metal oxide. The hollow region includes a through hole penetrating the third insulating member along the first direction.

38. The battery cell of any one of claims 1-31, wherein, Along the first direction, the first main body region has a second end, the first tab is connected to the second end, the second tab includes a second overhanging region beyond the second end, and the second overhanging region faces the first end at one end of the connecting portion, and in a projection plane perpendicular to the second direction, the second overhanging region partially overlaps the solid-state electrolyte layer in a projection.

39. The battery cell of any one of claims 1-31, wherein, The electrode assembly is a laminated structure, and the electrode assembly includes a plurality of the first tabs and a plurality of the second tabs, and the plurality of the first tabs and the plurality of the second tabs are arranged in a laminated manner along the second direction.

40. A battery device, comprising: A battery cell as claimed in any one of claims 1-39.

41. An electrical device, comprising: A battery cell as claimed in any one of claims 1-39 or a battery device as claimed in claim 40, the battery cell being used to provide electrical energy.

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